Reduce default verbosity now that the GUI is there

synch -> sync

.gitignore

@@ -1,3 +1,3 @@
 syncthing
 *.tar.gz
-build
+dist

CONTRIBUTING.md

@@ -0,0 +1,22 @@
+Please do contribute!
+
+## Building
+
+[See the wiki](https://github.com/calmh/syncthing/wiki/Building)
+
+## Tests
+
+Yes please!
+
+## Style
+
+`go fmt`
+
+## Documentation
+
+[Hack it here](https://github.com/calmh/syncthing/wiki)
+
+## License
+
+MIT
+

README.md

@@ -25,150 +25,11 @@ making sure large swarms of selfish agents behave and somehow work
 towards a common goal. Here we have a much smaller swarm of cooperative
 agents and a simpler approach will suffice.
 
-Features
---------
+Documentation
+=============
 
-The following features are _currently implemented and working_:
-
- * The formation of a cluster of nodes, certificate authenticated and
-   communicating over TLS over TCP.
-
- * Synchronization of a single directory among the cluster nodes.
-
- * Change detection by periodic scanning of the local repository.
-
- * Static configuration of cluster nodes.
-
- * Automatic discovery of cluster nodes. See [discover.go][discover.go]
-   for the protocol specification. Discovery on the LAN is performed by
-   broadcasts, Internet wide discovery is performed with the assistance
-   of a global server.
-
- * Handling of deleted files. Deletes can be propagated or ignored per
-   client.
-
- * Synchronizing multiple unrelated directory trees by following
-   symlinks directly below the repository level.
-
-The following features are _not yet implemented but planned_:
-
- * Change detection by listening to file system notifications instead of
-   periodic scanning.
-
- * HTTP GUI.
-
-The following features are _not implemented but may be implemented_ in
-the future:
-
- * Syncing multiple directories from the same syncthing instance.
-
- * Automatic NAT handling via UPNP.
-
- * Conflict resolution. Currently whichever file has the newest
-   modification time "wins". The correct behavior in the face of
-   conflicts is open for discussion.
-
-[discover.go]: (https://github.com/calmh/syncthing/blob/master/discover/discover.go
-
-Security
---------
-
-Security is one of the primary project goals. This means that it should
-not be possible for an attacker to join a cluster uninvited, and it
-should not be possible to extract private information from intercepted
-traffic. Currently this is implemented as follows.
-
-All traffic is protected by TLS. To prevent uninvited nodes from joining
-a cluster, the certificate fingerprint of each node is compared to a
-preset list of acceptable nodes at connection establishment. The
-fingerprint is computed as the SHA-1 hash of the certificate and
-displayed in BASE32 encoding to form a compact yet convenient string.
-Currently SHA-1 is deemed secure against preimage attacks.
-
-Installing
-==========
-
-Download the appropriate precompiled binary from the
-[releases](https://github.com/calmh/syncthing/releases) page. Untar and
-put the `syncthing` binary somewhere convenient in your `$PATH`.
-
-If you are a developer and have Go 1.2 installed you can also install
-the latest version from source:
-
-`go get github.com/calmh/syncthing`
-
-Usage
-=====
-
-Check out the options:
-
-```
-$ syncthing --help
-Usage:
-  syncthing [options]
-
-...
-```
-
-Run syncthing to let it create it's config directory and certificate:
-
-```
-$ syncthing
-11:34:13 main.go:85: INFO: Version v0.1-40-gbb0fd87
-11:34:13 tls.go:61: OK: Created TLS certificate file
-11:34:13 tls.go:67: OK: Created TLS key file
-11:34:13 main.go:66: INFO: My ID: NCTBZAAHXR6ZZP3D7SL3DLYFFQERMW4Q
-11:34:13 main.go:90: FATAL: No config file
-```
-
-Take note of the "My ID: ..." line. Perform the same operation on
-another computer to create another node. Take note of that ID as well,
-and create a config file `~/.syncthing/syncthing.ini` looking something
-like this:
-
-```
-[repository]
-dir = /Users/jb/Synced
-
-[nodes]
-NCTBZAAHXR6ZZP3D7SL3DLYFFQERMW4Q = 172.16.32.1:22000 192.23.34.56:22000
-CUGAE43Y5N64CRJU26YFH6MTWPSBLSUL = dynamic
-```
-
-This assumes that the first node is reachable on either of the two
-addresses listed (perhaps one internal and one port-forwarded external)
-and that the other node is not normally reachable from the outside. Save
-this config file, identically, to both nodes.
-
-If the nodes are running on the same network, or reachable on port 22000
-from the outside world, you can set all addresses to "dynamic" and they
-will find each other using automatic discovery. (This discovery,
-including port numbers, can be tweaked or disabled using command line
-options.)
-
-Start syncthing on both nodes. For the cautious, one side can be set to
-be read only.
-
-```
-$ syncthing --ro
-13:30:55 main.go:85: INFO: Version v0.1-40-gbb0fd87
-13:30:55 main.go:102: INFO: My ID: NCTBZAAHXR6ZZP3D7SL3DLYFFQERMW4Q
-13:30:55 main.go:149: INFO: Initial repository scan in progress
-13:30:59 main.go:153: INFO: Listening for incoming connections
-13:30:59 main.go:157: INFO: Attempting to connect to other nodes
-13:30:59 main.go:247: INFO: Starting local discovery
-13:30:59 main.go:165: OK: Ready to synchronize
-13:31:04 discover.go:113: INFO: Discovered node CUGAE43Y5N64CRJU26YFH6MTWPSBLSUL at 172.16.32.24:22000
-13:31:14 main.go:296: INFO: Connected to node CUGAE43Y5N64CRJU26YFH6MTWPSBLSUL
-13:31:19 main.go:345: INFO: Transferred 139 KiB in (14 KiB/s), 139 KiB out (14 KiB/s)
-13:32:20 model.go:94: INFO: CUGAE43Y5N64CRJU26YFH6MTWPSBLSUL: 263.4 KB/s in, 69.1 KB/s out
-13:32:20 model.go:104: INFO:  18289 files,  24.24 GB in cluster
-13:32:20 model.go:111: INFO:  17132 files,  22.39 GB in local repo
-13:32:20 model.go:117: INFO:   1157 files,   1.84 GB to synchronize
-...
-```
-You should see the synchronization start and then finish a short while
-later. Add nodes to taste.
+The syncthing documentation is kept on the
+[GitHub Wiki](https://github.com/calmh/syncthing/wiki).
 
 License
 =======

build.sh

@@ -1,39 +1,51 @@
 #!/bin/bash
 
+export COPYFILE_DISABLE=true
+
 version=$(git describe --always)
+buildDir=dist
 
-go test ./... || exit 1
+if [[ $fast != yes ]] ; then
+	go get -d
+	go test ./...
+fi
 
-rm -rf build
-mkdir -p build || exit 1
+if [[ -z $1 ]] ; then
+	go build -ldflags "-X main.Version $version"
+elif [[ $1 == "embed" ]] ; then
+	embedder auto gui > auto/gui.files.go \
+	&& go build -ldflags "-X main.Version $version"
+elif [[ $1 == "tar" ]] ; then
+	go build -ldflags "-X main.Version $version" \
+	&& mkdir syncthing-dist \
+	&& cp syncthing README.md LICENSE syncthing-dist \
+	&& tar zcvf syncthing-dist.tar.gz syncthing-dist \
+	&& rm -rf syncthing-dist
+elif [[ $1 == "all" ]] ; then
+	rm -rf "$buildDir"
+	mkdir -p "$buildDir" || exit 1
 
-for goos in darwin linux freebsd ; do
-	for goarch in amd64 386 ; do
-		echo "$goos-$goarch"
-		export GOOS="$goos"
-		export GOARCH="$goarch"
-		export name="syncthing-$goos-$goarch"
-		go build -ldflags "-X main.Version $version" \
-		&& mkdir -p "$name" \
-		&& cp syncthing "build/$name" \
-		&& cp README.md LICENSE "$name" \
-		&& mv syncthing "$name" \
-		&& tar zcf "build/$name.tar.gz" "$name" \
-		&& rm -r  "$name"
+	export GOARM=7
+	for os in darwin-amd64 linux-386 linux-amd64 linux-arm freebsd-386 freebsd-amd64 windows-386 windows-amd64 ; do
+		echo "$os"
+		export name="syncthing-$os"
+		export GOOS=${os%-*}
+		export GOARCH=${os#*-}
+		go build -ldflags "-X main.Version $version"
+		mkdir -p "$name"
+		cp README.md LICENSE "$name"
+		case $GOOS in
+			windows)
+				cp syncthing.exe "$buildDir/$name.exe"
+				mv syncthing.exe "$name"
+				zip -qr "$buildDir/$name.zip" "$name"
+				;;
+			*)
+				cp syncthing "$buildDir/$name"
+				mv syncthing "$name"
+				tar zcf "$buildDir/$name.tar.gz" "$name"
+				;;
+		esac
+		rm -r  "$name"
 	done
-done
-
-for goos in windows ; do
-	for goarch in amd64 386 ; do
-		echo "$goos-$goarch"
-		export GOOS="$goos"
-		export GOARCH="$goarch"
-		export name="syncthing-$goos-$goarch"
-		go build -ldflags "-X main.Version $version" \
-		&& mkdir -p "$name" \
-		&& cp syncthing.exe "build/$name.exe" \
-		&& cp README.md LICENSE "$name" \
-		&& zip -qr "build/$name.zip" "$name" \
-		&& rm -r  "$name"
-	done
-done
+fi

config.go

@@ -0,0 +1,135 @@
+package main
+
+import (
+	"encoding/xml"
+	"io"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+type Configuration struct {
+	Version      int                       `xml:"version,attr" default:"1"`
+	Repositories []RepositoryConfiguration `xml:"repository"`
+	Options      OptionsConfiguration      `xml:"options"`
+	XMLName      xml.Name                  `xml:"configuration" json:"-"`
+}
+
+type RepositoryConfiguration struct {
+	Directory string              `xml:"directory,attr"`
+	Nodes     []NodeConfiguration `xml:"node"`
+}
+
+type NodeConfiguration struct {
+	NodeID    string   `xml:"id,attr"`
+	Addresses []string `xml:"address"`
+}
+
+type OptionsConfiguration struct {
+	ListenAddress      string `xml:"listenAddress" default:":22000" ini:"listen-address"`
+	ReadOnly           bool   `xml:"readOnly" ini:"read-only"`
+	AllowDelete        bool   `xml:"allowDelete" default:"true" ini:"allow-delete"`
+	FollowSymlinks     bool   `xml:"followSymlinks" default:"true" ini:"follow-symlinks"`
+	GUIEnabled         bool   `xml:"guiEnabled" default:"true" ini:"gui-enabled"`
+	GUIAddress         string `xml:"guiAddress" default:"127.0.0.1:8080" ini:"gui-address"`
+	GlobalAnnServer    string `xml:"globalAnnounceServer" default:"syncthing.nym.se:22025" ini:"global-announce-server"`
+	GlobalAnnEnabled   bool   `xml:"globalAnnounceEnabled" default:"true" ini:"global-announce-enabled"`
+	LocalAnnEnabled    bool   `xml:"localAnnounceEnabled" default:"true" ini:"local-announce-enabled"`
+	ParallelRequests   int    `xml:"parallelRequests" default:"16" ini:"parallel-requests"`
+	MaxSendKbps        int    `xml:"maxSendKbps" ini:"max-send-kbps"`
+	RescanIntervalS    int    `xml:"rescanIntervalS" default:"60" ini:"rescan-interval"`
+	ReconnectIntervalS int    `xml:"reconnectionIntervalS" default:"60" ini:"reconnection-interval"`
+	MaxChangeKbps      int    `xml:"maxChangeKbps" default:"1000" ini:"max-change-bw"`
+}
+
+func setDefaults(data interface{}) error {
+	s := reflect.ValueOf(data).Elem()
+	t := s.Type()
+
+	for i := 0; i < s.NumField(); i++ {
+		f := s.Field(i)
+		tag := t.Field(i).Tag
+
+		v := tag.Get("default")
+		if len(v) > 0 {
+			switch f.Interface().(type) {
+			case string:
+				f.SetString(v)
+
+			case int:
+				i, err := strconv.ParseInt(v, 10, 64)
+				if err != nil {
+					return err
+				}
+				f.SetInt(i)
+
+			case bool:
+				f.SetBool(v == "true")
+
+			default:
+				panic(f.Type())
+			}
+		}
+	}
+	return nil
+}
+
+func readConfigINI(m map[string]string, data interface{}) error {
+	s := reflect.ValueOf(data).Elem()
+	t := s.Type()
+
+	for i := 0; i < s.NumField(); i++ {
+		f := s.Field(i)
+		tag := t.Field(i).Tag
+
+		name := tag.Get("ini")
+		if len(name) == 0 {
+			name = strings.ToLower(t.Field(i).Name)
+		}
+
+		if v, ok := m[name]; ok {
+			switch f.Interface().(type) {
+			case string:
+				f.SetString(v)
+
+			case int:
+				i, err := strconv.ParseInt(v, 10, 64)
+				if err == nil {
+					f.SetInt(i)
+				}
+
+			case bool:
+				f.SetBool(v == "true")
+
+			default:
+				panic(f.Type())
+			}
+		}
+	}
+	return nil
+}
+
+func writeConfigXML(wr io.Writer, cfg Configuration) error {
+	e := xml.NewEncoder(wr)
+	e.Indent("", "    ")
+	err := e.Encode(cfg)
+	if err != nil {
+		return err
+	}
+	_, err = wr.Write([]byte("\n"))
+	return err
+}
+
+func readConfigXML(rd io.Reader) (Configuration, error) {
+	var cfg Configuration
+
+	setDefaults(&cfg)
+	setDefaults(&cfg.Options)
+
+	var err error
+	if rd != nil {
+		err = xml.NewDecoder(rd).Decode(&cfg)
+	}
+
+	return cfg, err
+}

discover/discover.go

@@ -100,7 +100,6 @@ type Discoverer struct {
 	MyID             string
 	ListenPort       int
 	BroadcastIntv    time.Duration
-	ExtListenPort    int
 	ExtBroadcastIntv time.Duration
 
 	conn         *net.UDPConn
@@ -114,7 +113,7 @@ type Discoverer struct {
 // When we hit this many errors in succession, we stop.
 const maxErrors = 30
 
-func NewDiscoverer(id string, port int, extPort int, extServer string) (*Discoverer, error) {
+func NewDiscoverer(id string, port int, extServer string) (*Discoverer, error) {
 	local4 := &net.UDPAddr{IP: net.IP{0, 0, 0, 0}, Port: AnnouncementPort}
 	conn, err := net.ListenUDP("udp4", local4)
 	if err != nil {
@@ -125,7 +124,6 @@ func NewDiscoverer(id string, port int, extPort int, extServer string) (*Discove
 		MyID:             id,
 		ListenPort:       port,
 		BroadcastIntv:    30 * time.Second,
-		ExtListenPort:    extPort,
 		ExtBroadcastIntv: 1800 * time.Second,
 
 		conn:      conn,
@@ -138,7 +136,7 @@ func NewDiscoverer(id string, port int, extPort int, extServer string) (*Discove
 	if disc.ListenPort > 0 {
 		disc.sendAnnouncements()
 	}
-	if len(disc.extServer) > 0 && disc.ExtListenPort > 0 {
+	if len(disc.extServer) > 0 {
 		disc.sendExtAnnouncements()
 	}
 
@@ -153,13 +151,13 @@ func (d *Discoverer) sendAnnouncements() {
 }
 
 func (d *Discoverer) sendExtAnnouncements() {
-	extIP, err := net.ResolveUDPAddr("udp", d.extServer+":22025")
+	extIP, err := net.ResolveUDPAddr("udp", d.extServer)
 	if err != nil {
 		log.Printf("discover/external: %v; no external announcements", err)
 		return
 	}
 
-	buf := EncodePacket(Packet{AnnouncementMagic, uint16(d.ExtListenPort), d.MyID, nil})
+	buf := EncodePacket(Packet{AnnouncementMagic, uint16(22000), d.MyID, nil})
 	go d.writeAnnouncements(buf, extIP, d.ExtBroadcastIntv)
 }
 
@@ -213,7 +211,7 @@ func (d *Discoverer) recvAnnouncements() {
 }
 
 func (d *Discoverer) externalLookup(node string) (string, bool) {
-	extIP, err := net.ResolveUDPAddr("udp", d.extServer+":22025")
+	extIP, err := net.ResolveUDPAddr("udp", d.extServer)
 	if err != nil {
 		log.Printf("discover/external: %v; no external lookup", err)
 		return "", false

gui.go

@@ -0,0 +1,126 @@
+package main
+
+import (
+	"encoding/json"
+	"log"
+	"net/http"
+	"runtime"
+	"sync"
+
+	"github.com/calmh/syncthing/model"
+	"github.com/codegangsta/martini"
+)
+
+func startGUI(addr string, m *model.Model) {
+	router := martini.NewRouter()
+	router.Get("/", getRoot)
+	router.Get("/rest/version", restGetVersion)
+	router.Get("/rest/model", restGetModel)
+	router.Get("/rest/connections", restGetConnections)
+	router.Get("/rest/config", restGetConfig)
+	router.Get("/rest/need", restGetNeed)
+	router.Get("/rest/system", restGetSystem)
+
+	router.Post("/rest/config", restPostConfig)
+
+	go func() {
+		mr := martini.New()
+		mr.Use(embeddedStatic())
+		mr.Use(martini.Recovery())
+		mr.Action(router.Handle)
+		mr.Map(m)
+		err := http.ListenAndServe(addr, mr)
+		if err != nil {
+			warnln("GUI not possible:", err)
+		}
+	}()
+}
+
+func getRoot(w http.ResponseWriter, r *http.Request) {
+	http.Redirect(w, r, "/index.html", 302)
+}
+
+func restGetVersion() string {
+	return Version
+}
+
+func restGetModel(m *model.Model, w http.ResponseWriter) {
+	var res = make(map[string]interface{})
+
+	globalFiles, globalDeleted, globalBytes := m.GlobalSize()
+	res["globalFiles"], res["globalDeleted"], res["globalBytes"] = globalFiles, globalDeleted, globalBytes
+
+	localFiles, localDeleted, localBytes := m.LocalSize()
+	res["localFiles"], res["localDeleted"], res["localBytes"] = localFiles, localDeleted, localBytes
+
+	inSyncFiles, inSyncBytes := m.InSyncSize()
+	res["inSyncFiles"], res["inSyncBytes"] = inSyncFiles, inSyncBytes
+
+	files, total := m.NeedFiles()
+	res["needFiles"], res["needBytes"] = len(files), total
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(res)
+}
+
+func restGetConnections(m *model.Model, w http.ResponseWriter) {
+	var res = m.ConnectionStats()
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(res)
+}
+
+func restGetConfig(w http.ResponseWriter) {
+	json.NewEncoder(w).Encode(cfg)
+}
+
+func restPostConfig(req *http.Request) {
+	err := json.NewDecoder(req.Body).Decode(&cfg)
+	if err != nil {
+		log.Println(err)
+	} else {
+		saveConfig()
+	}
+}
+
+type guiFile model.File
+
+func (f guiFile) MarshalJSON() ([]byte, error) {
+	type t struct {
+		Name string
+		Size int
+	}
+	return json.Marshal(t{
+		Name: f.Name,
+		Size: model.File(f).Size(),
+	})
+}
+
+func restGetNeed(m *model.Model, w http.ResponseWriter) {
+	files, _ := m.NeedFiles()
+	gfs := make([]guiFile, len(files))
+	for i, f := range files {
+		gfs[i] = guiFile(f)
+	}
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(gfs)
+}
+
+var cpuUsagePercent float64
+var cpuUsageLock sync.RWMutex
+
+func restGetSystem(w http.ResponseWriter) {
+	var m runtime.MemStats
+	runtime.ReadMemStats(&m)
+
+	res := make(map[string]interface{})
+	res["myID"] = myID
+	res["goroutines"] = runtime.NumGoroutine()
+	res["alloc"] = m.Alloc
+	res["sys"] = m.Sys
+	cpuUsageLock.RLock()
+	res["cpuPercent"] = cpuUsagePercent
+	cpuUsageLock.RUnlock()
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(res)
+}

gui/angular.min.js

@@ -0,0 +1,203 @@
+/*
+ AngularJS v1.2.7
+ (c) 2010-2014 Google, Inc. http://angularjs.org
+ License: MIT
+*/
+(function(Z,Q,r){'use strict';function F(b){return function(){var a=arguments[0],c,a="["+(b?b+":":"")+a+"] http://errors.angularjs.org/1.2.7/"+(b?b+"/":"")+a;for(c=1;c<arguments.length;c++)a=a+(1==c?"?":"&")+"p"+(c-1)+"="+encodeURIComponent("function"==typeof arguments[c]?arguments[c].toString().replace(/ \{[\s\S]*$/,""):"undefined"==typeof arguments[c]?"undefined":"string"!=typeof arguments[c]?JSON.stringify(arguments[c]):arguments[c]);return Error(a)}}function qb(b){if(null==b||za(b))return!1;var a=
+b.length;return 1===b.nodeType&&a?!0:D(b)||K(b)||0===a||"number"===typeof a&&0<a&&a-1 in b}function q(b,a,c){var d;if(b)if(L(b))for(d in b)"prototype"==d||("length"==d||"name"==d||b.hasOwnProperty&&!b.hasOwnProperty(d))||a.call(c,b[d],d);else if(b.forEach&&b.forEach!==q)b.forEach(a,c);else if(qb(b))for(d=0;d<b.length;d++)a.call(c,b[d],d);else for(d in b)b.hasOwnProperty(d)&&a.call(c,b[d],d);return b}function Ob(b){var a=[],c;for(c in b)b.hasOwnProperty(c)&&a.push(c);return a.sort()}function Oc(b,
+a,c){for(var d=Ob(b),e=0;e<d.length;e++)a.call(c,b[d[e]],d[e]);return d}function Pb(b){return function(a,c){b(c,a)}}function Ya(){for(var b=ka.length,a;b;){b--;a=ka[b].charCodeAt(0);if(57==a)return ka[b]="A",ka.join("");if(90==a)ka[b]="0";else return ka[b]=String.fromCharCode(a+1),ka.join("")}ka.unshift("0");return ka.join("")}function Qb(b,a){a?b.$$hashKey=a:delete b.$$hashKey}function t(b){var a=b.$$hashKey;q(arguments,function(a){a!==b&&q(a,function(a,c){b[c]=a})});Qb(b,a);return b}function S(b){return parseInt(b,
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+return{restrict:"E",priority:100,compile:function(d,e){if(z(e.value)){var g=a(d.text(),!0);g||e.$set("value",d.text())}return function(a,d,e){var k=d.parent(),l=k.data("$selectController")||k.parent().data("$selectController");l&&l.databound?d.prop("selected",!1):l=c;g?a.$watch(g,function(a,c){e.$set("value",a);a!==c&&l.removeOption(c);l.addOption(a)}):l.addOption(e.value);d.on("$destroy",function(){l.removeOption(e.value)})}}}}],Ie=$({restrict:"E",terminal:!0});(Ba=Z.jQuery)?(A=Ba,t(Ba.fn,{scope:Ea.scope,
+isolateScope:Ea.isolateScope,controller:Ea.controller,injector:Ea.injector,inheritedData:Ea.inheritedData}),wb("remove",!0,!0,!1),wb("empty",!1,!1,!1),wb("html",!1,!1,!0)):A=O;Na.element=A;(function(a){t(a,{bootstrap:Yb,copy:fa,extend:t,equals:ua,element:A,forEach:q,injector:Zb,noop:w,bind:bb,toJson:pa,fromJson:Ub,identity:Aa,isUndefined:z,isDefined:B,isString:D,isFunction:L,isObject:X,isNumber:rb,isElement:Pc,isArray:K,version:Rd,isDate:Ja,lowercase:x,uppercase:Ga,callbacks:{counter:0},$$minErr:F,
+$$csp:Tb});Ta=Uc(Z);try{Ta("ngLocale")}catch(c){Ta("ngLocale",[]).provider("$locale",rd)}Ta("ng",["ngLocale"],["$provide",function(a){a.provider({$$sanitizeUri:Bd});a.provider("$compile",ic).directive({a:Wd,input:Lc,textarea:Lc,form:Xd,script:De,select:Ge,style:Ie,option:He,ngBind:he,ngBindHtml:je,ngBindTemplate:ie,ngClass:ke,ngClassEven:me,ngClassOdd:le,ngCloak:ne,ngController:oe,ngForm:Yd,ngHide:xe,ngIf:pe,ngInclude:qe,ngInit:se,ngNonBindable:te,ngPluralize:ue,ngRepeat:ve,ngShow:we,ngStyle:ye,ngSwitch:ze,
+ngSwitchWhen:Ae,ngSwitchDefault:Be,ngOptions:Fe,ngTransclude:Ce,ngModel:ce,ngList:ee,ngChange:de,required:Mc,ngRequired:Mc,ngValue:ge}).directive({ngInclude:re}).directive(Nb).directive(Nc);a.provider({$anchorScroll:cd,$animate:Td,$browser:ed,$cacheFactory:fd,$controller:id,$document:jd,$exceptionHandler:kd,$filter:Ac,$interpolate:pd,$interval:qd,$http:ld,$httpBackend:nd,$location:td,$log:ud,$parse:xd,$rootScope:Ad,$q:yd,$sce:Ed,$sceDelegate:Dd,$sniffer:Fd,$templateCache:gd,$timeout:Gd,$window:Hd})}])})(Na);
+A(Q).ready(function(){Sc(Q,Yb)})})(window,document);!angular.$$csp()&&angular.element(document).find("head").prepend('<style type="text/css">@charset "UTF-8";[ng\\:cloak],[ng-cloak],[data-ng-cloak],[x-ng-cloak],.ng-cloak,.x-ng-cloak,.ng-hide{display:none !important;}ng\\:form{display:block;}</style>');
+//# sourceMappingURL=angular.min.js.map

gui/app.js

@@ -0,0 +1,312 @@
+var syncthing = angular.module('syncthing', []);
+
+syncthing.controller('SyncthingCtrl', function ($scope, $http) {
+    var prevDate = 0;
+    var modelGetOK = true;
+
+    $scope.connections = {};
+    $scope.config = {};
+    $scope.myID = "";
+    $scope.nodes = [];
+
+    // Strings before bools look better
+    $scope.settings = [
+        {id: 'ListenAddress', descr:"Sync Protocol Listen Address", type: 'string', restart: true},
+        {id: 'GUIAddress', descr: "GUI Listen Address", type: 'string', restart: true},
+        {id: 'MaxSendKbps', descr: "Outgoing Rate Limit (KBps)", type: 'string', restart: true},
+        {id: 'RescanIntervalS', descr: "Rescan Interval (s)", type: 'string', restart: true},
+        {id: 'ReconnectIntervalS', descr: "Reconnect Interval (s)", type: 'string', restart: true},
+        {id: 'ParallelRequests', descr: "Max Outstanding Requests", type: 'string', restart: true},
+        {id: 'MaxChangeKbps', descr: "Max File Change Rate (KBps)", type: 'string', restart: true},
+
+        {id: 'ReadOnly', descr: "Read Only", type: 'bool', restart: true},
+        {id: 'AllowDelete', descr: "Allow Delete", type: 'bool', restart: true},
+        {id: 'FollowSymlinks', descr: "Follow Symlinks", type: 'bool', restart: true},
+        {id: 'GlobalAnnEnabled', descr: "Global Announce", type: 'bool', restart: true},
+        {id: 'LocalAnnEnabled', descr: "Local Announce", type: 'bool', restart: true},
+    ];
+
+    function modelGetSucceeded() {
+        if (!modelGetOK) {
+            $('#networkError').modal('hide');
+            modelGetOK = true;
+        }
+    }
+
+    function modelGetFailed() {
+        if (modelGetOK) {
+            $('#networkError').modal({backdrop: 'static', keyboard: false});
+            modelGetOK = false;
+        }
+    }
+
+    $http.get("/rest/version").success(function (data) {
+        $scope.version = data;
+    });
+    $http.get("/rest/system").success(function (data) {
+        $scope.system = data;
+        $scope.myID = data.myID;
+
+        $http.get("/rest/config").success(function (data) {
+            $scope.config = data;
+
+            var nodes = $scope.config.Repositories[0].Nodes;
+            nodes.sort(function (a, b) {
+                if (a.NodeID == $scope.myID)
+                    return -1;
+                if (b.NodeID == $scope.myID)
+                    return 1;
+                if (a.NodeID < b.NodeID)
+                    return -1;
+                return a.NodeID > b.NodeID;
+            })
+            $scope.nodes = nodes;
+        });
+    });
+
+    $scope.refresh = function () {
+        $http.get("/rest/system").success(function (data) {
+            $scope.system = data;
+        });
+        $http.get("/rest/model").success(function (data) {
+            $scope.model = data;
+            modelGetSucceeded();
+        }).error(function () {
+            modelGetFailed();
+        });
+        $http.get("/rest/connections").success(function (data) {
+            var now = Date.now();
+            var td = (now - prevDate) / 1000;
+            prevDate = now;
+
+            for (var id in data) {
+                try {
+                    data[id].inbps = Math.max(0, 8 * (data[id].InBytesTotal - $scope.connections[id].InBytesTotal) / td);
+                    data[id].outbps = Math.max(0, 8 * (data[id].OutBytesTotal - $scope.connections[id].OutBytesTotal) / td);
+                } catch (e) {
+                    data[id].inbps = 0;
+                    data[id].outbps = 0;
+                }
+            }
+            $scope.connections = data;
+        });
+        $http.get("/rest/need").success(function (data) {
+            var i, name;
+            for (i = 0; i < data.length; i++) {
+                name = data[i].Name.split("/");
+                data[i].ShortName = name[name.length-1];
+            }
+            data.sort(function (a, b) {
+                if (a.ShortName < b.ShortName) {
+                    return -1;
+                }
+                if (a.ShortName > b.ShortName) {
+                    return 1;
+                }
+                return 0;
+            });
+            $scope.need = data;
+        });
+    };
+
+    $scope.nodeIcon = function (nodeCfg) {
+        if (nodeCfg.NodeID === $scope.myID) {
+            return "ok";
+        }
+
+        if ($scope.connections[nodeCfg.NodeID]) {
+            return "ok";
+        }
+
+        return "minus";
+    };
+
+    $scope.nodeClass = function (nodeCfg) {
+        if (nodeCfg.NodeID === $scope.myID) {
+            return "default";
+        }
+
+        var conn = $scope.connections[nodeCfg.NodeID];
+        if (conn) {
+            return "success";
+        }
+
+        return "info";
+    };
+
+    $scope.nodeAddr = function (nodeCfg) {
+        if (nodeCfg.NodeID === $scope.myID) {
+            return "this node";
+        }
+        var conn = $scope.connections[nodeCfg.NodeID];
+        if (conn) {
+            return conn.Address;
+        }
+        return nodeCfg.Addresses.join(", ");
+    };
+
+    $scope.nodeVer = function (nodeCfg) {
+        if (nodeCfg.NodeID === $scope.myID) {
+            return $scope.version;
+        }
+        var conn = $scope.connections[nodeCfg.NodeID];
+        if (conn) {
+            return conn.ClientVersion;
+        }
+        return "";
+    };
+
+    $scope.saveSettings = function () {
+        $http.post('/rest/config', JSON.stringify($scope.config), {headers: {'Content-Type': 'application/json'}});
+        $('#settingsTable').collapse('hide');
+    };
+
+    $scope.editNode = function (nodeCfg) {
+        $scope.currentNode = nodeCfg;
+        $scope.editingExisting = true;
+        $scope.currentNode.AddressesStr = nodeCfg.Addresses.join(", ")
+        $('#editNode').modal({backdrop: 'static', keyboard: false});
+    };
+
+    $scope.addNode = function () {
+        $scope.currentNode = {NodeID: "", AddressesStr: "dynamic"};
+        $scope.editingExisting = false;
+        $('#editNode').modal({backdrop: 'static', keyboard: false});
+    };
+
+    $scope.deleteNode = function () {
+        $('#editNode').modal('hide');
+        if (!$scope.editingExisting)
+            return;
+
+        var newNodes = [];
+        for (var i = 0; i < $scope.nodes.length; i++) {
+            if ($scope.nodes[i].NodeID !== $scope.currentNode.NodeID) {
+                newNodes.push($scope.nodes[i]);
+            }
+        } 
+
+        $scope.nodes = newNodes;
+        $scope.config.Repositories[0].Nodes = newNodes;
+
+        $http.post('/rest/config', JSON.stringify($scope.config), {headers: {'Content-Type': 'application/json'}})
+    }
+
+    $scope.saveNode = function () {
+        $('#editNode').modal('hide');
+        nodeCfg = $scope.currentNode;
+        nodeCfg.Addresses = nodeCfg.AddressesStr.split(',').map(function (x) { return x.trim(); });
+
+        var done = false;
+        for (var i = 0; i < $scope.nodes.length; i++) {
+            if ($scope.nodes[i].NodeID === nodeCfg.NodeID) {
+                $scope.nodes[i] = nodeCfg;
+                done = true;
+                break;
+            }
+        } 
+
+        if (!done) {
+            $scope.nodes.push(nodeCfg);
+        }
+
+        $scope.nodes.sort(function (a, b) {
+            if (a.NodeID == $scope.myID)
+                return -1;
+            if (b.NodeID == $scope.myID)
+                return 1;
+            if (a.NodeID < b.NodeID)
+                return -1;
+            return a.NodeID > b.NodeID;
+        })
+
+        $scope.config.Repositories[0].Nodes = $scope.nodes;
+
+        $http.post('/rest/config', JSON.stringify($scope.config), {headers: {'Content-Type': 'application/json'}})
+    };
+
+    $scope.refresh();
+    setInterval($scope.refresh, 10000);
+});
+
+function decimals(val, num) {
+    if (val === 0) { return 0; }
+    var digits = Math.floor(Math.log(Math.abs(val))/Math.log(10));
+    var decimals = Math.max(0, num - digits);
+    return decimals;
+}
+
+syncthing.filter('natural', function() {
+    return function(input, valid) {
+        return input.toFixed(decimals(input, valid));
+    }
+});
+
+syncthing.filter('binary', function() {
+    return function(input) {
+        if (input === undefined) {
+            return '0 '
+        }
+        if (input > 1024 * 1024 * 1024) {
+            input /= 1024 * 1024 * 1024;
+            return input.toFixed(decimals(input, 2)) + ' Gi';
+        }
+        if (input > 1024 * 1024) {
+            input /= 1024 * 1024;
+            return input.toFixed(decimals(input, 2)) + ' Mi';
+        }
+        if (input > 1024) {
+            input /= 1024;
+            return input.toFixed(decimals(input, 2)) + ' Ki';
+        }
+        return Math.round(input) + ' ';
+    }
+});
+
+syncthing.filter('metric', function() {
+    return function(input) {
+        if (input === undefined) {
+            return '0 '
+        }
+        if (input > 1000 * 1000 * 1000) {
+            input /= 1000 * 1000 * 1000;
+            return input.toFixed(decimals(input, 2)) + ' G';
+        }
+        if (input > 1000 * 1000) {
+            input /= 1000 * 1000;
+            return input.toFixed(decimals(input, 2)) + ' M';
+        }
+        if (input > 1000) {
+            input /= 1000;
+            return input.toFixed(decimals(input, 2)) + ' k';
+        }
+        return Math.round(input) + ' ';
+    }
+});
+
+syncthing.filter('short', function() {
+    return function(input) {
+        return input.substr(0, 6);
+    }
+});
+
+syncthing.filter('alwaysNumber', function() {
+    return function(input) {
+        if (input === undefined) {
+            return 0;
+        }
+        return input;
+    }
+});
+
+syncthing.directive('optionEditor', function() {
+    return {
+        restrict: 'C',
+        replace: true,
+        transclude: true,
+        scope: {
+            setting: '=setting',
+        },
+        template: '<input type="text" ng-model="config.Options[setting.id]"></input>',
+    };
+})

gui/index.html

@@ -0,0 +1,246 @@
+<!DOCTYPE html>
+<html lang="en" ng-app="syncthing">
+<head>
+<meta charset="utf-8">
+<meta http-equiv="X-UA-Compatible" content="IE=edge">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+<meta name="description" content="">
+<meta name="author" content="">
+<link rel="shortcut icon" href="../../docs-assets/ico/favicon.png">
+
+<title>syncthing</title>
+<link href="bootstrap/css/bootstrap.min.css" rel="stylesheet">
+<style type="text/css">
+html, body {
+    height: 100%;
+}
+#wrap{
+    padding-top: 20px;
+    min-height: 100%;
+    height: auto;
+    margin: 0 auto -50px;
+    padding: 20px 0 50px 0;
+}
+#footer {
+    height: 50px;
+    padding: 12px;
+    background-color: #f5f5f5;
+}
+
+.header {
+    border-bottom: 1px solid #e5e5e5;
+    padding-bottom: 10px;
+}
+
+.text-monospace {
+    font-family: monospace;
+}
+
+.table-condensed>thead>tr>th, .table-condensed>tbody>tr>th, .table-condensed>tfoot>tr>th, .table-condensed>thead>tr>td, .table-condensed>tbody>tr>td, .table-condensed>tfoot>tr>td {
+    border-top: none;
+}
+
+</style>
+</head>
+
+<body ng-controller="SyncthingCtrl">
+<div id="wrap">
+    <div class="container">
+        <div class="header">
+            <h3 class="text-muted">syncthing</h3>
+        </div>
+
+        <div class="row">
+            <div class="col-md-12">
+                <div class="panel" ng-class="{'panel-success': model.needBytes === 0, 'panel-primary': model.needBytes !== 0}">
+                    <div class="panel-heading"><h3 class="panel-title">Synchronization</h3></div>
+                    <div class="panel-body">
+                        <div class="progress">
+                            <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100"
+                                ng-class="{'progress-bar-success': model.needBytes === 0, 'progress-bar-info': model.needBytes !== 0}"
+                                style="width: {{100 * model.inSyncBytes / model.globalBytes | number:2}}%;">
+                                {{100 * model.inSyncBytes / model.globalBytes | alwaysNumber | number:0}}%
+                            </div>
+                        </div>
+                        <p ng-show="model.needBytes > 0">Need {{model.needFiles | alwaysNumber}} files, {{model.needBytes | binary}}B</p>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="row">
+            <div class="col-md-12">
+                <div class="panel panel-info">
+                    <div class="panel-heading"><h3 class="panel-title">Cluster</h3></div>
+                    <table class="table table-condensed">
+                        <tbody>
+                        <tr ng-repeat="nodeCfg in nodes" ng-class="{'text-muted': nodeCfg.NodeID == myID}">
+                            <td>
+                                <span class="label label-{{nodeClass(nodeCfg)}}">
+                                    <span class="glyphicon glyphicon-{{nodeIcon(nodeCfg)}}"></span>
+                                </span>
+                            </td>
+                            <td>
+                                <span class="text-monospace">{{nodeCfg.NodeID | short}}</span>
+                            </td>
+                            <td>
+                                {{nodeVer(nodeCfg)}}
+                            </td>
+                            <td>
+                                {{nodeAddr(nodeCfg)}}
+                            </td>
+                            <td class="text-right">
+                                <span ng-show="nodeCfg.NodeID != myID">
+                                    <abbr title="{{connections[nodeCfg.NodeID].InBytesTotal | binary}}B">{{connections[nodeCfg.NodeID].inbps | metric}}bps</abbr>
+                                    <span class="text-muted glyphicon glyphicon-chevron-down"></span>
+                                </span>
+                            </td>
+                            <td class="text-right">
+                                <span ng-show="nodeCfg.NodeID != myID">
+                                    <abbr title="{{connections[nodeCfg.NodeID].OutBytesTotal | binary}}B">{{connections[nodeCfg.NodeID].outbps | metric}}bps</abbr>
+                                    <span class="text-muted glyphicon glyphicon-chevron-up"></span>
+                                </span>
+                            </td>
+                            <td class="text-right">
+                                <button ng-show="nodeCfg.NodeID != myID" type="button" ng-click="editNode(nodeCfg)" class="btn btn-default btn-xs"><span class="glyphicon glyphicon-pencil"></span> Edit</button>
+                            </td>
+                        </tr>
+                        <tr>
+                            <td></td>
+                            <td></td>
+                            <td></td>
+                            <td></td>
+                            <td></td>
+                            <td></td>
+                            <td class="text-right">
+                                <button type="button" class="btn btn-default btn-xs" ng-click="addNode()"><span class="glyphicon glyphicon-plus"></span> Add</button>
+                            </td>
+                        </tr>
+                        </tbody>
+                    </table>
+                </div>
+            </div>
+        </div>
+
+        <div class="row">
+            <div class="col-md-6">
+                <div class="panel panel-info">
+                    <div class="panel-heading"><h3 class="panel-title">Repository</h3></div>
+                    <div class="panel-body">
+                        <p>Cluster contains {{model.globalFiles | alwaysNumber}} files, {{model.globalBytes | binary}}B
+                        <span class="text-muted">(+{{model.globalDeleted | alwaysNumber}} delete records)</span></p>
+
+                        <p>Local repository has {{model.localFiles | alwaysNumber}} files, {{model.localBytes | binary}}B
+                        <span class="text-muted">(+{{model.localDeleted | alwaysNumber}} delete records)</span></p>
+                    </div>
+                </div>
+            </div>
+
+            <div class="col-md-6">
+                <div class="panel panel-info">
+                    <div class="panel-heading"><h3 class="panel-title">System</h3></div>
+                    <div class="panel-body">
+                        <p>{{system.sys | binary}}B RAM allocated, {{system.alloc | binary}}B in use</p>
+                        <p>{{system.cpuPercent | alwaysNumber | natural:1}}% CPU, {{system.goroutines | alwaysNumber}} goroutines</p>
+                    </div>
+                </div>
+            </div>
+        </div>
+
+        <div class="row">
+            <div class="col-md-6">
+                <div class="panel panel-info">
+                    <div class="panel-heading"><h3 class="panel-title"><a href="" data-toggle="collapse" data-target="#settingsTable">Settings</a></h3></div>
+                    <div id="settingsTable" class="panel-collapse collapse">
+                        <div class="panel-body">
+                            <form role="form">
+                                <div class="form-group" ng-repeat="setting in settings">
+                                    <div ng-if="setting.type == 'string'">
+                                        <label for="{{setting.id}}">{{setting.descr}}</label>
+                                        <input id="{{setting.id}}" class="form-control" type="text" ng-model="config.Options[setting.id]"></input>
+                                    </div>
+                                    <div class="checkbox" ng-if="setting.type == 'bool'">
+                                        <label>
+                                            {{setting.descr}} <input id="{{setting.id}}" type="checkbox" ng-model="config.Options[setting.id]"></input>
+                                        </label>
+                                    </div>
+                                </div>
+                            </form>
+                        </div>
+                        <div class="panel-footer">
+                            <button type="button" class="btn btn-sm btn-default" ng-click="saveSettings()">Save</button>
+                            <small><span class="text-muted">Changes take effect when restarting syncthing.</span></small>
+                        </div>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>
+<div id="footer" class="text-center">
+    syncthing {{version}}
+    | <a href="https://github.com/calmh/syncthing/releases">Latest Release</a>
+    | <a href="https://github.com/calmh/syncthing/wiki">Documentation</a>
+    | <a href="https://github.com/calmh/syncthing/issues">Bugs</a>
+    | <a href="https://github.com/calmh/syncthing">Source Code</a>
+</div>
+
+<div id="networkError" class="modal fade">
+    <div class="modal-dialog">
+        <div class="modal-content">
+            <div class="modal-header alert alert-danger">
+                <h4 class="modal-title">
+                    <span class="glyphicon glyphicon-exclamation-sign"></span>
+                    Connection Error
+                </h4>
+            </div>
+            <div class="modal-body">
+                <p>
+                Syncthing seems to be down, or there is a problem with your Internet connection.
+                Retrying&hellip;
+                </p>
+            </div>
+        </div>
+    </div>
+</div>
+
+<div id="editNode" class="modal fade">
+    <div class="modal-dialog modal-lg">
+        <div class="modal-content">
+            <div class="modal-header">
+                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
+                <h4 class="modal-title">Edit Node</h4>
+            </div>
+            <div class="modal-body">
+                <form role="form">
+                    <div class="form-group">
+                        <label for="nodeID">Node ID</label>
+                        <input placeholder="YUFJOUDPORCMA..." ng-disabled="editingExisting" id="nodeID" class="form-control" type="text" ng-model="currentNode.NodeID"></input>
+                        <p class="help-block">The node ID can be found in the logs or in the "Add Node" dialog on the other node.</p>
+                    </div>
+                    <div class="form-group">
+                        <label for="addresses">Addresses</label>
+                        <input placeholder="dynamic" id="addresses" class="form-control" type="text" ng-model="currentNode.AddressesStr"></input>
+                        <p class="help-block">Enter comma separated <span class="text-monospace">ip:port</span> addresses or <span class="text-monospace">dynamic</span> to perform automatic discovery of the address.</p>
+                    </div>
+                </form>
+                <div ng-show="!editingExisting">
+                When adding a new node, keep in mind that <em>this node</em> must be added on the other side too. The Node ID of this node is:
+                <pre>{{myID}}</pre>
+                </div>
+            </div>
+            <div class="modal-footer">
+                <button type="button" class="btn btn-primary" ng-click="saveNode()">Save</button>
+                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
+                <button ng-if="editingExisting" type="button" class="btn btn-danger pull-left" ng-click="deleteNode()">Delete</button>
+            </div>
+        </div>
+    </div>
+</div>
+
+<script src="angular.min.js"></script>
+<script src="jquery-2.0.3.min.js"></script>
+<script src="bootstrap/js/bootstrap.min.js"></script>
+<script src="app.js"></script>
+</body>
+</html>

gui_development.go

@@ -0,0 +1,9 @@
+//+build guidev
+
+package main
+
+import "github.com/codegangsta/martini"
+
+func embeddedStatic() interface{} {
+	return martini.Static("gui")
+}

gui_embedded.go

@@ -0,0 +1,46 @@
+//+build !guidev
+
+package main
+
+import (
+	"fmt"
+	"log"
+	"mime"
+	"net/http"
+	"path/filepath"
+	"time"
+
+	"github.com/calmh/syncthing/auto"
+	"github.com/cratonica/embed"
+)
+
+func embeddedStatic() interface{} {
+	fs, err := embed.Unpack(auto.Resources)
+	if err != nil {
+		panic(err)
+	}
+
+	var modt = time.Now().UTC().Format(http.TimeFormat)
+
+	return func(res http.ResponseWriter, req *http.Request, log *log.Logger) {
+		file := req.URL.Path
+
+		if file[0] == '/' {
+			file = file[1:]
+		}
+
+		bs, ok := fs[file]
+		if !ok {
+			return
+		}
+
+		mtype := mime.TypeByExtension(filepath.Ext(req.URL.Path))
+		if len(mtype) != 0 {
+			res.Header().Set("Content-Type", mtype)
+		}
+		res.Header().Set("Content-Size", fmt.Sprintf("%d", len(bs)))
+		res.Header().Set("Last-Modified", modt)
+
+		res.Write(bs)
+	}
+}

gui_unix.go

@@ -0,0 +1,31 @@
+//+build !windows,!solaris
+
+package main
+
+import (
+	"syscall"
+	"time"
+)
+
+func init() {
+	go trackCPUUsage()
+}
+
+func trackCPUUsage() {
+	var prevUsage int64
+	var prevTime = time.Now().UnixNano()
+	var rusage syscall.Rusage
+	for {
+		time.Sleep(10 * time.Second)
+		syscall.Getrusage(syscall.RUSAGE_SELF, &rusage)
+		curTime := time.Now().UnixNano()
+		timeDiff := curTime - prevTime
+		curUsage := rusage.Utime.Nano() + rusage.Stime.Nano()
+		usageDiff := curUsage - prevUsage
+		cpuUsageLock.Lock()
+		cpuUsagePercent = 100 * float64(usageDiff) / float64(timeDiff)
+		cpuUsageLock.Unlock()
+		prevTime = curTime
+		prevUsage = curUsage
+	}
+}

integration/.gitignore

@@ -0,0 +1,5 @@
+files-*
+conf-*
+md5-*
+genfiles
+md5r

integration/genfiles.go

@@ -0,0 +1,42 @@
+package main
+
+import (
+	"crypto/rand"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	mr "math/rand"
+	"os"
+	"path"
+)
+
+func name() string {
+	var b [16]byte
+	rand.Reader.Read(b[:])
+	return fmt.Sprintf("%x", b[:])
+}
+
+func main() {
+	var files int
+	var maxexp int
+
+	flag.IntVar(&files, "files", 1000, "Number of files")
+	flag.IntVar(&maxexp, "maxexp", 20, "Maximum file size (max = 2^n + 128*1024 B)")
+	flag.Parse()
+
+	for i := 0; i < files; i++ {
+		n := name()
+		p0 := path.Join(string(n[0]), n[0:2])
+		os.MkdirAll(p0, 0755)
+		s := 1 << uint(mr.Intn(maxexp))
+		a := 128 * 1024
+		if a > s {
+			a = s
+		}
+		s += mr.Intn(a)
+		b := make([]byte, s)
+		rand.Reader.Read(b)
+		p1 := path.Join(p0, n)
+		ioutil.WriteFile(p1, b, 0644)
+	}
+}

integration/md5r.go

@@ -0,0 +1,59 @@
+package main
+
+import (
+	"crypto/md5"
+	"flag"
+	"fmt"
+	"io"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	flag.Parse()
+	args := flag.Args()
+
+	if len(args) == 0 {
+		args = []string{"."}
+	}
+
+	for _, path := range args {
+		err := filepath.Walk(path, walker)
+
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			os.Exit(1)
+		}
+	}
+}
+
+func walker(path string, info os.FileInfo, err error) error {
+	if err != nil {
+		return err
+	}
+
+	if !info.IsDir() {
+		sum, err := md5file(path)
+		if err != nil {
+			return err
+		}
+		fmt.Printf("%s  %s\n", sum, path)
+	}
+
+	return nil
+}
+
+func md5file(fname string) (hash string, err error) {
+	f, err := os.Open(fname)
+	if err != nil {
+		return
+	}
+	defer f.Close()
+
+	h := md5.New()
+	io.Copy(h, f)
+	hb := h.Sum(nil)
+	hash = fmt.Sprintf("%x", hb)
+
+	return
+}

integration/test.sh

@@ -0,0 +1,74 @@
+#!/bin/bash
+
+rm -rf files-* conf-* md5-*
+
+extraopts=""
+p=$(pwd)
+
+go build genfiles.go
+go build md5r.go
+
+echo "Setting up (keys)..."
+i1=$(syncthing --home conf-1 2>&1 | awk '/My ID/ {print $7}')
+echo $i1
+i2=$(syncthing --home conf-2 2>&1 | awk '/My ID/ {print $7}')
+echo $i2
+i3=$(syncthing --home conf-3 2>&1 | awk '/My ID/ {print $7}')
+echo $i3
+
+echo "Setting up (files)..."
+for i in 1 2 3 ; do
+	cat >conf-$i/syncthing.ini <<EOT
+[repository]
+dir = $p/files-$i
+
+[nodes]
+$i1 = 127.0.0.1:22001
+$i2 = 127.0.0.1:22002
+$i3 = 127.0.0.1:22003
+
+[settings]
+gui-enabled = false
+listen-address = :2200$i
+EOT
+
+	mkdir files-$i
+	pushd files-$i >/dev/null
+	../genfiles -maxexp 21 -files 400
+	touch empty-$i
+	../md5r > ../md5-$i
+	popd >/dev/null
+done
+
+echo "Starting..."
+for i in 1 2 3 ; do
+	sleep 1
+	syncthing --home conf-$i $extraopts &
+done
+
+cat md5-* | sort > md5-tot
+while true ; do
+	read
+	echo Verifying...
+
+	conv=0
+	for i in 1 2 3 ; do
+		pushd files-$i >/dev/null
+		../md5r | sort > ../md5-$i
+		popd >/dev/null
+		if ! cmp md5-$i md5-tot >/dev/null ; then
+			echo $i unconverged
+		else
+			conv=$((conv + 1))
+			echo $i converged
+		fi
+	done
+
+	if [[ $conv == 3 ]] ; then
+		kill %1
+		kill %2
+		kill %3
+		exit
+	fi
+done
+

logger.go

@@ -6,7 +6,8 @@ import (
 	"os"
 )
 
-var logger = log.New(os.Stderr, "", log.Ltime)
+// set in main()
+var logger *log.Logger
 
 func debugln(vals ...interface{}) {
 	s := fmt.Sprintln(vals...)

main.go

@@ -2,8 +2,8 @@ package main
 
 import (
 	"compress/gzip"
-	"crypto/sha1"
 	"crypto/tls"
+	"flag"
 	"fmt"
 	"log"
 	"net"
@@ -11,93 +11,147 @@ import (
 	_ "net/http/pprof"
 	"os"
 	"path"
+	"runtime"
+	"runtime/debug"
 	"strconv"
 	"strings"
 	"time"
 
 	"github.com/calmh/ini"
 	"github.com/calmh/syncthing/discover"
-	flags "github.com/calmh/syncthing/github.com/jessevdk/go-flags"
+	"github.com/calmh/syncthing/model"
 	"github.com/calmh/syncthing/protocol"
 )
 
-type Options struct {
-	ConfDir    string           `short:"c" long:"cfg" description:"Configuration directory" default:"~/.syncthing" value-name:"DIR"`
-	Listen     string           `short:"l" long:"listen" description:"Listen address" default:":22000" value-name:"ADDR"`
-	ReadOnly   bool             `short:"r" long:"ro" description:"Repository is read only"`
-	Delete     bool             `short:"d" long:"delete" description:"Delete files deleted from cluster"`
-	Rehash     bool             `long:"rehash" description:"Ignore cache and rehash all files in repository"`
-	NoSymlinks bool             `long:"no-symlinks" description:"Don't follow first level symlinks in the repo"`
-	Discovery  DiscoveryOptions `group:"Discovery Options"`
-	Advanced   AdvancedOptions  `group:"Advanced Options"`
-	Debug      DebugOptions     `group:"Debugging Options"`
-}
-
-type DebugOptions struct {
-	LogSource bool   `long:"log-source"`
-	TraceFile bool   `long:"trace-file"`
-	TraceNet  bool   `long:"trace-net"`
-	TraceIdx  bool   `long:"trace-idx"`
-	Profiler  string `long:"profiler" value-name:"ADDR"`
-}
-
-type DiscoveryOptions struct {
-	ExternalServer      string `long:"ext-server" description:"External discovery server" value-name:"NAME" default:"syncthing.nym.se"`
-	ExternalPort        int    `short:"e" long:"ext-port" description:"External listen port" value-name:"PORT" default:"22000"`
-	NoExternalDiscovery bool   `short:"n" long:"no-ext-announce" description:"Do not announce presence externally"`
-	NoLocalDiscovery    bool   `short:"N" long:"no-local-announce" description:"Do not announce presence locally"`
-}
-
-type AdvancedOptions struct {
-	RequestsInFlight int           `long:"reqs-in-flight" description:"Parallell in flight requests per file" default:"4" value-name:"REQS"`
-	FilesInFlight    int           `long:"files-in-flight" description:"Parallell in flight file pulls" default:"8" value-name:"FILES"`
-	ScanInterval     time.Duration `long:"scan-intv" description:"Repository scan interval" default:"60s" value-name:"INTV"`
-	ConnInterval     time.Duration `long:"conn-intv" description:"Node reconnect interval" default:"60s" value-name:"INTV"`
-}
-
-var opts Options
+var cfg Configuration
 var Version string = "unknown-dev"
 
-const (
-	confDirName  = ".syncthing"
-	confFileName = "syncthing.ini"
+var (
+	myID   string
+	config ini.Config
 )
 
 var (
-	config    ini.Config
-	nodeAddrs = make(map[string][]string)
+	showVersion bool
+	confDir     string
+	trace       string
+	profiler    string
+	verbose     bool
 )
 
 func main() {
-	_, err := flags.Parse(&opts)
-	if err != nil {
+	log.SetOutput(os.Stderr)
+	logger = log.New(os.Stderr, "", log.Flags())
+
+	flag.StringVar(&confDir, "home", "~/.syncthing", "Set configuration directory")
+	flag.StringVar(&trace, "debug.trace", "", "(connect,net,idx,file,pull)")
+	flag.StringVar(&profiler, "debug.profiler", "", "(addr)")
+	flag.BoolVar(&showVersion, "version", false, "Show version")
+	flag.BoolVar(&verbose, "v", false, "Be more verbose")
+	flag.Usage = usageFor(flag.CommandLine, "syncthing [options]")
+	flag.Parse()
+
+	if showVersion {
+		fmt.Println(Version)
 		os.Exit(0)
 	}
-	if opts.Debug.TraceFile || opts.Debug.TraceIdx || opts.Debug.TraceNet || opts.Debug.LogSource {
-		logger = log.New(os.Stderr, "", log.Lshortfile|log.Ldate|log.Ltime|log.Lmicroseconds)
-	}
-	if strings.HasPrefix(opts.ConfDir, "~/") {
-		opts.ConfDir = strings.Replace(opts.ConfDir, "~", getHomeDir(), 1)
+
+	if len(os.Getenv("GOGC")) == 0 {
+		debug.SetGCPercent(25)
 	}
 
-	infoln("Version", Version)
+	if len(os.Getenv("GOMAXPROCS")) == 0 {
+		runtime.GOMAXPROCS(runtime.NumCPU())
+	}
+
+	if len(trace) > 0 {
+		log.SetFlags(log.Lshortfile | log.Ldate | log.Ltime | log.Lmicroseconds)
+		logger.SetFlags(log.Lshortfile | log.Ldate | log.Ltime | log.Lmicroseconds)
+	}
+	confDir = expandTilde(confDir)
 
 	// Ensure that our home directory exists and that we have a certificate and key.
 
-	ensureDir(opts.ConfDir, 0700)
-	cert, err := loadCert(opts.ConfDir)
+	ensureDir(confDir, 0700)
+	cert, err := loadCert(confDir)
 	if err != nil {
-		newCertificate(opts.ConfDir)
-		cert, err = loadCert(opts.ConfDir)
+		newCertificate(confDir)
+		cert, err = loadCert(confDir)
 		fatalErr(err)
 	}
 
-	myID := string(certId(cert.Certificate[0]))
+	myID = string(certId(cert.Certificate[0]))
+	log.SetPrefix("[" + myID[0:5] + "] ")
+	logger.SetPrefix("[" + myID[0:5] + "] ")
+
+	infoln("Version", Version)
 	infoln("My ID:", myID)
 
-	if opts.Debug.Profiler != "" {
+	// Prepare to be able to save configuration
+
+	cfgFile := path.Join(confDir, "config.xml")
+	go saveConfigLoop(cfgFile)
+
+	// Load the configuration file, if it exists.
+	// If it does not, create a template.
+
+	cf, err := os.Open(cfgFile)
+	if err == nil {
+		// Read config.xml
+		cfg, err = readConfigXML(cf)
+		if err != nil {
+			fatalln(err)
+		}
+		cf.Close()
+	} else {
+		// No config.xml, let's try the old syncthing.ini
+		iniFile := path.Join(confDir, "syncthing.ini")
+		cf, err := os.Open(iniFile)
+		if err == nil {
+			infoln("Migrating syncthing.ini to config.xml")
+			iniCfg := ini.Parse(cf)
+			cf.Close()
+			os.Rename(iniFile, path.Join(confDir, "migrated_syncthing.ini"))
+
+			cfg, _ = readConfigXML(nil)
+			cfg.Repositories = []RepositoryConfiguration{
+				{Directory: iniCfg.Get("repository", "dir")},
+			}
+			readConfigINI(iniCfg.OptionMap("settings"), &cfg.Options)
+			for name, addrs := range iniCfg.OptionMap("nodes") {
+				n := NodeConfiguration{
+					NodeID:    name,
+					Addresses: strings.Fields(addrs),
+				}
+				cfg.Repositories[0].Nodes = append(cfg.Repositories[0].Nodes, n)
+			}
+
+			saveConfig()
+		}
+	}
+
+	if len(cfg.Repositories) == 0 {
+		infoln("No config file; starting with empty defaults")
+
+		cfg, err = readConfigXML(nil)
+		cfg.Repositories = []RepositoryConfiguration{
+			{
+				Directory: "~/Sync",
+				Nodes: []NodeConfiguration{
+					{NodeID: myID, Addresses: []string{"dynamic"}},
+				},
+			},
+		}
+
+		saveConfig()
+		infof("Edit %s to taste or use the GUI\n", cfgFile)
+	}
+
+	var dir = expandTilde(cfg.Repositories[0].Directory)
+
+	if len(profiler) > 0 {
 		go func() {
-			err := http.ListenAndServe(opts.Debug.Profiler, nil)
+			err := http.ListenAndServe(profiler, nil)
 			if err != nil {
 				warnln(err)
 			}
@@ -107,80 +161,171 @@ func main() {
 	// The TLS configuration is used for both the listening socket and outgoing
 	// connections.
 
-	cfg := &tls.Config{
-		ClientAuth:         tls.RequestClientCert,
-		ServerName:         "syncthing",
-		NextProtos:         []string{"bep/1.0"},
-		InsecureSkipVerify: true,
-		Certificates:       []tls.Certificate{cert},
-	}
-
-	// Load the configuration file, if it exists.
-
-	cf, err := os.Open(path.Join(opts.ConfDir, confFileName))
-	if err != nil {
-		fatalln("No config file")
-		config = ini.Config{}
-	}
-	config = ini.Parse(cf)
-	cf.Close()
-
-	var dir = config.Get("repository", "dir")
-
-	// Create a map of desired node connections based on the configuration file
-	// directives.
-
-	for nodeID, addrs := range config.OptionMap("nodes") {
-		addrs := strings.Fields(addrs)
-		nodeAddrs[nodeID] = addrs
+	tlsCfg := &tls.Config{
+		Certificates:           []tls.Certificate{cert},
+		NextProtos:             []string{"bep/1.0"},
+		ServerName:             myID,
+		ClientAuth:             tls.RequestClientCert,
+		SessionTicketsDisabled: true,
+		InsecureSkipVerify:     true,
+		MinVersion:             tls.VersionTLS12,
 	}
 
 	ensureDir(dir, -1)
-	m := NewModel(dir)
+	m := model.NewModel(dir, cfg.Options.MaxChangeKbps*1000)
+	for _, t := range strings.Split(trace, ",") {
+		m.Trace(t)
+	}
+	if cfg.Options.MaxSendKbps > 0 {
+		m.LimitRate(cfg.Options.MaxSendKbps)
+	}
+
+	// GUI
+	if cfg.Options.GUIEnabled && cfg.Options.GUIAddress != "" {
+		host, port, err := net.SplitHostPort(cfg.Options.GUIAddress)
+		if err != nil {
+			warnf("Cannot start GUI on %q: %v", cfg.Options.GUIAddress, err)
+		} else {
+			if len(host) > 0 {
+				infof("Starting web GUI on http://%s", cfg.Options.GUIAddress)
+			} else {
+				infof("Starting web GUI on port %s", port)
+			}
+			startGUI(cfg.Options.GUIAddress, m)
+		}
+	}
 
 	// Walk the repository and update the local model before establishing any
 	// connections to other nodes.
 
-	if !opts.Rehash {
-		infoln("Loading index cache")
-		loadIndex(m)
+	if verbose {
+		infoln("Populating repository index")
 	}
-	infoln("Populating repository index")
+	loadIndex(m)
 	updateLocalModel(m)
 
 	// Routine to listen for incoming connections
-	infoln("Listening for incoming connections")
-	go listen(myID, opts.Listen, m, cfg)
+	if verbose {
+		infoln("Listening for incoming connections")
+	}
+	go listen(myID, cfg.Options.ListenAddress, m, tlsCfg)
 
 	// Routine to connect out to configured nodes
-	infoln("Attempting to connect to other nodes")
-	go connect(myID, opts.Listen, nodeAddrs, m, cfg)
+	if verbose {
+		infoln("Attempting to connect to other nodes")
+	}
+	go connect(myID, cfg.Options.ListenAddress, m, tlsCfg)
 
 	// Routine to pull blocks from other nodes to synchronize the local
 	// repository. Does not run when we are in read only (publish only) mode.
-	if !opts.ReadOnly {
-		infoln("Cleaning out incomplete synchronizations")
-		CleanTempFiles(dir)
-		okln("Ready to synchronize")
-		m.Start()
+	if !cfg.Options.ReadOnly {
+		if verbose {
+			if cfg.Options.AllowDelete {
+				infoln("Deletes from peer nodes are allowed")
+			} else {
+				infoln("Deletes from peer nodes will be ignored")
+			}
+			okln("Ready to synchronize (read-write)")
+		}
+		m.StartRW(cfg.Options.AllowDelete, cfg.Options.ParallelRequests)
+	} else if verbose {
+		okln("Ready to synchronize (read only; no external updates accepted)")
 	}
 
 	// Periodically scan the repository and update the local model.
 	// XXX: Should use some fsnotify mechanism.
 	go func() {
+		td := time.Duration(cfg.Options.RescanIntervalS) * time.Second
 		for {
-			time.Sleep(opts.Advanced.ScanInterval)
-			updateLocalModel(m)
+			time.Sleep(td)
+			if m.LocalAge() > (td / 2).Seconds() {
+				updateLocalModel(m)
+			}
 		}
 	}()
 
+	if verbose {
+		// Periodically print statistics
+		go printStatsLoop(m)
+	}
+
 	select {}
 }
 
-func listen(myID string, addr string, m *Model, cfg *tls.Config) {
-	l, err := tls.Listen("tcp", addr, cfg)
+var saveConfigCh = make(chan struct{})
+
+func saveConfigLoop(cfgFile string) {
+	for _ = range saveConfigCh {
+		fd, err := os.Create(cfgFile + ".tmp")
+		if err != nil {
+			warnln(err)
+			continue
+		}
+
+		err = writeConfigXML(fd, cfg)
+		if err != nil {
+			warnln(err)
+			fd.Close()
+			continue
+		}
+
+		err = fd.Close()
+		if err != nil {
+			warnln(err)
+			continue
+		}
+
+		err = os.Rename(cfgFile+".tmp", cfgFile)
+		if err != nil {
+			warnln(err)
+		}
+	}
+}
+
+func saveConfig() {
+	saveConfigCh <- struct{}{}
+}
+
+func printStatsLoop(m *model.Model) {
+	var lastUpdated int64
+	var lastStats = make(map[string]model.ConnectionInfo)
+
+	for {
+		time.Sleep(60 * time.Second)
+
+		for node, stats := range m.ConnectionStats() {
+			secs := time.Since(lastStats[node].At).Seconds()
+			inbps := 8 * int(float64(stats.InBytesTotal-lastStats[node].InBytesTotal)/secs)
+			outbps := 8 * int(float64(stats.OutBytesTotal-lastStats[node].OutBytesTotal)/secs)
+
+			if inbps+outbps > 0 {
+				infof("%s: %sb/s in, %sb/s out", node[0:5], MetricPrefix(inbps), MetricPrefix(outbps))
+			}
+
+			lastStats[node] = stats
+		}
+
+		if lu := m.Generation(); lu > lastUpdated {
+			lastUpdated = lu
+			files, _, bytes := m.GlobalSize()
+			infof("%6d files, %9sB in cluster", files, BinaryPrefix(bytes))
+			files, _, bytes = m.LocalSize()
+			infof("%6d files, %9sB in local repo", files, BinaryPrefix(bytes))
+			needFiles, bytes := m.NeedFiles()
+			infof("%6d files, %9sB to synchronize", len(needFiles), BinaryPrefix(bytes))
+		}
+	}
+}
+
+func listen(myID string, addr string, m *model.Model, tlsCfg *tls.Config) {
+	l, err := tls.Listen("tcp", addr, tlsCfg)
 	fatalErr(err)
 
+	connOpts := map[string]string{
+		"clientId":      "syncthing",
+		"clientVersion": Version,
+	}
+
 listen:
 	for {
 		conn, err := l.Accept()
@@ -189,7 +334,7 @@ listen:
 			continue
 		}
 
-		if opts.Debug.TraceNet {
+		if strings.Contains(trace, "connect") {
 			debugln("NET: Connect from", conn.RemoteAddr())
 		}
 
@@ -213,9 +358,10 @@ listen:
 			warnf("Connect from connected node (%s)", remoteID)
 		}
 
-		for nodeID := range nodeAddrs {
-			if nodeID == remoteID {
-				m.AddConnection(conn, remoteID)
+		for _, nodeCfg := range cfg.Repositories[0].Nodes {
+			if nodeCfg.NodeID == remoteID {
+				protoConn := protocol.NewConnection(remoteID, conn, conn, m, connOpts)
+				m.AddConnection(conn, protoConn)
 				continue listen
 			}
 		}
@@ -223,85 +369,91 @@ listen:
 	}
 }
 
-func connect(myID string, addr string, nodeAddrs map[string][]string, m *Model, cfg *tls.Config) {
+func connect(myID string, addr string, m *model.Model, tlsCfg *tls.Config) {
 	_, portstr, err := net.SplitHostPort(addr)
 	fatalErr(err)
 	port, _ := strconv.Atoi(portstr)
 
-	if opts.Discovery.NoLocalDiscovery {
+	if !cfg.Options.LocalAnnEnabled {
 		port = -1
-	} else {
+	} else if verbose {
 		infoln("Sending local discovery announcements")
 	}
 
-	if opts.Discovery.NoExternalDiscovery {
-		opts.Discovery.ExternalPort = -1
-	} else {
+	if !cfg.Options.GlobalAnnEnabled {
+		cfg.Options.GlobalAnnServer = ""
+	} else if verbose {
 		infoln("Sending external discovery announcements")
 	}
 
-	disc, err := discover.NewDiscoverer(myID, port, opts.Discovery.ExternalPort, opts.Discovery.ExternalServer)
+	disc, err := discover.NewDiscoverer(myID, port, cfg.Options.GlobalAnnServer)
 
 	if err != nil {
 		warnf("No discovery possible (%v)", err)
 	}
 
+	connOpts := map[string]string{
+		"clientId":      "syncthing",
+		"clientVersion": Version,
+	}
+
 	for {
 	nextNode:
-		for nodeID, addrs := range nodeAddrs {
-			if nodeID == myID {
+		for _, nodeCfg := range cfg.Repositories[0].Nodes {
+			if nodeCfg.NodeID == myID {
 				continue
 			}
-			if m.ConnectedTo(nodeID) {
+			if m.ConnectedTo(nodeCfg.NodeID) {
 				continue
 			}
-			for _, addr := range addrs {
+			for _, addr := range nodeCfg.Addresses {
 				if addr == "dynamic" {
 					var ok bool
 					if disc != nil {
-						addr, ok = disc.Lookup(nodeID)
+						addr, ok = disc.Lookup(nodeCfg.NodeID)
 					}
 					if !ok {
 						continue
 					}
 				}
 
-				if opts.Debug.TraceNet {
-					debugln("NET: Dial", nodeID, addr)
+				if strings.Contains(trace, "connect") {
+					debugln("NET: Dial", nodeCfg.NodeID, addr)
 				}
-				conn, err := tls.Dial("tcp", addr, cfg)
+				conn, err := tls.Dial("tcp", addr, tlsCfg)
 				if err != nil {
-					if opts.Debug.TraceNet {
+					if strings.Contains(trace, "connect") {
 						debugln("NET:", err)
 					}
 					continue
 				}
 
 				remoteID := certId(conn.ConnectionState().PeerCertificates[0].Raw)
-				if remoteID != nodeID {
-					warnln("Unexpected nodeID", remoteID, "!=", nodeID)
+				if remoteID != nodeCfg.NodeID {
+					warnln("Unexpected nodeID", remoteID, "!=", nodeCfg.NodeID)
 					conn.Close()
 					continue
 				}
 
-				m.AddConnection(conn, remoteID)
+				protoConn := protocol.NewConnection(remoteID, conn, conn, m, connOpts)
+				m.AddConnection(conn, protoConn)
 				continue nextNode
 			}
 		}
 
-		time.Sleep(opts.Advanced.ConnInterval)
+		time.Sleep(time.Duration(cfg.Options.ReconnectIntervalS) * time.Second)
 	}
 }
 
-func updateLocalModel(m *Model) {
-	files := Walk(m.Dir(), m, !opts.NoSymlinks)
+func updateLocalModel(m *model.Model) {
+	files, _ := m.Walk(cfg.Options.FollowSymlinks)
 	m.ReplaceLocal(files)
 	saveIndex(m)
 }
 
-func saveIndex(m *Model) {
-	name := fmt.Sprintf("%x.idx.gz", sha1.Sum([]byte(m.Dir())))
-	fullName := path.Join(opts.ConfDir, name)
+func saveIndex(m *model.Model) {
+	name := m.RepoID() + ".idx.gz"
+	fullName := path.Join(confDir, name)
 	idxf, err := os.Create(fullName + ".tmp")
 	if err != nil {
 		return
@@ -315,9 +467,9 @@ func saveIndex(m *Model) {
 	os.Rename(fullName+".tmp", fullName)
 }
 
-func loadIndex(m *Model) {
-	fname := fmt.Sprintf("%x.idx.gz", sha1.Sum([]byte(m.Dir())))
-	idxf, err := os.Open(path.Join(opts.ConfDir, fname))
+func loadIndex(m *model.Model) {
+	name := m.RepoID() + ".idx.gz"
+	idxf, err := os.Open(path.Join(confDir, name))
 	if err != nil {
 		return
 	}
@@ -333,7 +485,7 @@ func loadIndex(m *Model) {
 	if err != nil {
 		return
 	}
-	m.SeedIndex(idx)
+	m.SeedLocal(idx)
 }
 
 func ensureDir(dir string, mode int) {
@@ -347,6 +499,13 @@ func ensureDir(dir string, mode int) {
 	}
 }
 
+func expandTilde(p string) string {
+	if strings.HasPrefix(p, "~/") {
+		return strings.Replace(p, "~", getHomeDir(), 1)
+	}
+	return p
+}
+
 func getHomeDir() string {
 	home := os.Getenv("HOME")
 	if home == "" {

model.go

@@ -1,527 +0,0 @@
-package main
-
-/*
-
-Locking
-=======
-
-The model has read and write locks. These must be acquired as appropriate by
-public methods. To prevent deadlock situations, private methods should never
-acquire locks, but document what locks they require.
-
-*/
-
-import (
-	"fmt"
-	"io"
-	"os"
-	"path"
-	"sync"
-	"time"
-
-	"github.com/calmh/syncthing/buffers"
-	"github.com/calmh/syncthing/protocol"
-)
-
-type Model struct {
-	sync.RWMutex
-	dir string
-
-	global  map[string]File // the latest version of each file as it exists in the cluster
-	local   map[string]File // the files we currently have locally on disk
-	remote  map[string]map[string]File
-	need    map[string]bool // the files we need to update
-	nodes   map[string]*protocol.Connection
-	rawConn map[string]io.ReadWriteCloser
-
-	updatedLocal int64 // timestamp of last update to local
-	updateGlobal int64 // timestamp of last update to remote
-
-	lastIdxBcast        time.Time
-	lastIdxBcastRequest time.Time
-}
-
-const (
-	FlagDeleted = 1 << 12
-
-	idxBcastHoldtime = 15 * time.Second  // Wait at least this long after the last index modification
-	idxBcastMaxDelay = 120 * time.Second // Unless we've already waited this long
-)
-
-func NewModel(dir string) *Model {
-	m := &Model{
-		dir:          dir,
-		global:       make(map[string]File),
-		local:        make(map[string]File),
-		remote:       make(map[string]map[string]File),
-		need:         make(map[string]bool),
-		nodes:        make(map[string]*protocol.Connection),
-		rawConn:      make(map[string]io.ReadWriteCloser),
-		lastIdxBcast: time.Now(),
-	}
-
-	go m.printStatsLoop()
-	go m.broadcastIndexLoop()
-	return m
-}
-
-func (m *Model) Start() {
-	go m.puller()
-}
-
-func (m *Model) printStatsLoop() {
-	var lastUpdated int64
-	for {
-		time.Sleep(60 * time.Second)
-		m.RLock()
-		m.printConnectionStats()
-		if m.updatedLocal+m.updateGlobal > lastUpdated {
-			m.printModelStats()
-			lastUpdated = m.updatedLocal + m.updateGlobal
-		}
-		m.RUnlock()
-	}
-}
-
-func (m *Model) printConnectionStats() {
-	for node, conn := range m.nodes {
-		stats := conn.Statistics()
-		if stats.InBytesPerSec > 0 || stats.OutBytesPerSec > 0 {
-			infof("%s: %sB/s in, %sB/s out", node, toSI(stats.InBytesPerSec), toSI(stats.OutBytesPerSec))
-		}
-	}
-}
-
-func (m *Model) printModelStats() {
-	var tot int
-	for _, f := range m.global {
-		tot += f.Size()
-	}
-	infof("%6d files, %8sB in cluster", len(m.global), toSI(tot))
-
-	if len(m.need) > 0 {
-		tot = 0
-		for _, f := range m.local {
-			tot += f.Size()
-		}
-		infof("%6d files, %8sB in local repo", len(m.local), toSI(tot))
-
-		tot = 0
-		for n := range m.need {
-			tot += m.global[n].Size()
-		}
-		infof("%6d files, %8sB to synchronize", len(m.need), toSI(tot))
-	}
-}
-
-func toSI(n int) string {
-	if n > 1<<30 {
-		return fmt.Sprintf("%.02f G", float64(n)/(1<<30))
-	}
-	if n > 1<<20 {
-		return fmt.Sprintf("%.02f M", float64(n)/(1<<20))
-	}
-	if n > 1<<10 {
-		return fmt.Sprintf("%.01f K", float64(n)/(1<<10))
-	}
-	return fmt.Sprintf("%d ", n)
-}
-
-// Index is called when a new node is connected and we receive their full index.
-func (m *Model) Index(nodeID string, fs []protocol.FileInfo) {
-	m.Lock()
-	defer m.Unlock()
-
-	if opts.Debug.TraceNet {
-		debugf("NET IDX(in): %s: %d files", nodeID, len(fs))
-	}
-
-	m.remote[nodeID] = make(map[string]File)
-	for _, f := range fs {
-		if f.Flags&FlagDeleted != 0 && !opts.Delete {
-			// Files marked as deleted do not even enter the model
-			continue
-		}
-		m.remote[nodeID][f.Name] = fileFromFileInfo(f)
-	}
-
-	m.recomputeGlobal()
-	m.recomputeNeed()
-	m.printModelStats()
-}
-
-// IndexUpdate is called for incremental updates to connected nodes' indexes.
-func (m *Model) IndexUpdate(nodeID string, fs []protocol.FileInfo) {
-	m.Lock()
-	defer m.Unlock()
-
-	if opts.Debug.TraceNet {
-		debugf("NET IDXUP(in): %s: %d files", nodeID, len(fs))
-	}
-
-	repo, ok := m.remote[nodeID]
-	if !ok {
-		return
-	}
-
-	for _, f := range fs {
-		if f.Flags&FlagDeleted != 0 && !opts.Delete {
-			// Files marked as deleted do not even enter the model
-			continue
-		}
-		repo[f.Name] = fileFromFileInfo(f)
-	}
-
-	m.recomputeGlobal()
-	m.recomputeNeed()
-}
-
-// SeedIndex is called when our previously cached index is loaded from disk at startup.
-func (m *Model) SeedIndex(fs []protocol.FileInfo) {
-	m.Lock()
-	defer m.Unlock()
-
-	m.local = make(map[string]File)
-	for _, f := range fs {
-		m.local[f.Name] = fileFromFileInfo(f)
-	}
-
-	m.recomputeGlobal()
-	m.recomputeNeed()
-	m.printModelStats()
-}
-
-func (m *Model) Close(node string, err error) {
-	m.Lock()
-	defer m.Unlock()
-
-	conn, ok := m.rawConn[node]
-	if ok {
-		conn.Close()
-	} else {
-		warnln("Close on unknown connection for node", node)
-	}
-
-	if err != nil {
-		warnf("Disconnected from node %s: %v", node, err)
-	} else {
-		infoln("Disconnected from node", node)
-	}
-
-	delete(m.remote, node)
-	delete(m.nodes, node)
-	delete(m.rawConn, node)
-
-	m.recomputeGlobal()
-	m.recomputeNeed()
-}
-
-func (m *Model) Request(nodeID, name string, offset uint64, size uint32, hash []byte) ([]byte, error) {
-	if opts.Debug.TraceNet && nodeID != "<local>" {
-		debugf("NET REQ(in): %s: %q o=%d s=%d h=%x", nodeID, name, offset, size, hash)
-	}
-	fn := path.Join(m.dir, name)
-	fd, err := os.Open(fn) // XXX: Inefficient, should cache fd?
-	if err != nil {
-		return nil, err
-	}
-	defer fd.Close()
-
-	buf := buffers.Get(int(size))
-	_, err = fd.ReadAt(buf, int64(offset))
-	if err != nil {
-		return nil, err
-	}
-
-	return buf, nil
-}
-
-func (m *Model) RequestGlobal(nodeID, name string, offset uint64, size uint32, hash []byte) ([]byte, error) {
-	m.RLock()
-	nc, ok := m.nodes[nodeID]
-	m.RUnlock()
-	if !ok {
-		return nil, fmt.Errorf("RequestGlobal: no such node: %s", nodeID)
-	}
-
-	if opts.Debug.TraceNet {
-		debugf("NET REQ(out): %s: %q o=%d s=%d h=%x", nodeID, name, offset, size, hash)
-	}
-
-	return nc.Request(name, offset, size, hash)
-}
-
-func (m *Model) ReplaceLocal(fs []File) {
-	m.Lock()
-	defer m.Unlock()
-
-	var updated bool
-	var newLocal = make(map[string]File)
-
-	for _, f := range fs {
-		newLocal[f.Name] = f
-		if ef := m.local[f.Name]; ef.Modified != f.Modified {
-			updated = true
-		}
-	}
-
-	if m.markDeletedLocals(newLocal) {
-		updated = true
-	}
-
-	if len(newLocal) != len(m.local) {
-		updated = true
-	}
-
-	if updated {
-		m.local = newLocal
-		m.recomputeGlobal()
-		m.recomputeNeed()
-		m.updatedLocal = time.Now().Unix()
-		m.lastIdxBcastRequest = time.Now()
-	}
-}
-
-func (m *Model) broadcastIndexLoop() {
-	for {
-		m.RLock()
-		bcastRequested := m.lastIdxBcastRequest.After(m.lastIdxBcast)
-		holdtimeExceeded := time.Since(m.lastIdxBcastRequest) > idxBcastHoldtime
-		m.RUnlock()
-
-		maxDelayExceeded := time.Since(m.lastIdxBcast) > idxBcastMaxDelay
-		if bcastRequested && (holdtimeExceeded || maxDelayExceeded) {
-			m.Lock()
-			var indexWg sync.WaitGroup
-			indexWg.Add(len(m.nodes))
-			idx := m.protocolIndex()
-			m.lastIdxBcast = time.Now()
-			for _, node := range m.nodes {
-				node := node
-				if opts.Debug.TraceNet {
-					debugf("NET IDX(out/loop): %s: %d files", node.ID, len(idx))
-				}
-				go func() {
-					node.Index(idx)
-					indexWg.Done()
-				}()
-			}
-			m.Unlock()
-			indexWg.Wait()
-		}
-		time.Sleep(idxBcastHoldtime)
-	}
-}
-
-// markDeletedLocals sets the deleted flag on files that have gone missing locally.
-// Must be called with the write lock held.
-func (m *Model) markDeletedLocals(newLocal map[string]File) bool {
-	// For every file in the existing local table, check if they are also
-	// present in the new local table. If they are not, check that we already
-	// had the newest version available according to the global table and if so
-	// note the file as having been deleted.
-	var updated bool
-	for n, f := range m.local {
-		if _, ok := newLocal[n]; !ok {
-			if gf := m.global[n]; gf.Modified <= f.Modified {
-				if f.Flags&FlagDeleted == 0 {
-					f.Flags = FlagDeleted
-					f.Modified = f.Modified + 1
-					f.Blocks = nil
-					updated = true
-				}
-				newLocal[n] = f
-			}
-		}
-	}
-	return updated
-}
-
-func (m *Model) UpdateLocal(f File) {
-	m.Lock()
-	defer m.Unlock()
-
-	if ef, ok := m.local[f.Name]; !ok || ef.Modified != f.Modified {
-		m.local[f.Name] = f
-		m.recomputeGlobal()
-		m.recomputeNeed()
-		m.updatedLocal = time.Now().Unix()
-		m.lastIdxBcastRequest = time.Now()
-	}
-}
-
-func (m *Model) Dir() string {
-	m.RLock()
-	defer m.RUnlock()
-	return m.dir
-}
-
-func (m *Model) HaveFiles() []File {
-	m.RLock()
-	defer m.RUnlock()
-	var files []File
-	for _, file := range m.local {
-		files = append(files, file)
-	}
-	return files
-}
-
-func (m *Model) LocalFile(name string) (File, bool) {
-	m.RLock()
-	defer m.RUnlock()
-	f, ok := m.local[name]
-	return f, ok
-}
-
-func (m *Model) GlobalFile(name string) (File, bool) {
-	m.RLock()
-	defer m.RUnlock()
-	f, ok := m.global[name]
-	return f, ok
-}
-
-// Must be called with the write lock held.
-func (m *Model) recomputeGlobal() {
-	var newGlobal = make(map[string]File)
-
-	for n, f := range m.local {
-		newGlobal[n] = f
-	}
-
-	for _, fs := range m.remote {
-		for n, f := range fs {
-			if cf, ok := newGlobal[n]; !ok || cf.Modified < f.Modified {
-				newGlobal[n] = f
-			}
-		}
-	}
-
-	// Figure out if anything actually changed
-
-	var updated bool
-	if len(newGlobal) != len(m.global) {
-		updated = true
-	} else {
-		for n, f0 := range newGlobal {
-			if f1, ok := m.global[n]; !ok || f0.Modified != f1.Modified {
-				updated = true
-				break
-			}
-		}
-	}
-
-	if updated {
-		m.updateGlobal = time.Now().Unix()
-		m.global = newGlobal
-	}
-}
-
-// Must be called with the write lock held.
-func (m *Model) recomputeNeed() {
-	m.need = make(map[string]bool)
-	for n, f := range m.global {
-		hf, ok := m.local[n]
-		if !ok || f.Modified > hf.Modified {
-			m.need[n] = true
-		}
-	}
-}
-
-// Must be called with the read lock held.
-func (m *Model) whoHas(name string) []string {
-	var remote []string
-
-	gf := m.global[name]
-	for node, files := range m.remote {
-		if file, ok := files[name]; ok && file.Modified == gf.Modified {
-			remote = append(remote, node)
-		}
-	}
-
-	return remote
-}
-
-func (m *Model) ConnectedTo(nodeID string) bool {
-	m.RLock()
-	defer m.RUnlock()
-	_, ok := m.nodes[nodeID]
-	return ok
-}
-
-func (m *Model) ProtocolIndex() []protocol.FileInfo {
-	m.RLock()
-	defer m.RUnlock()
-	return m.protocolIndex()
-}
-
-// Must be called with the read lock held.
-func (m *Model) protocolIndex() []protocol.FileInfo {
-	var index []protocol.FileInfo
-	for _, f := range m.local {
-		mf := fileInfoFromFile(f)
-		if opts.Debug.TraceIdx {
-			var flagComment string
-			if mf.Flags&FlagDeleted != 0 {
-				flagComment = " (deleted)"
-			}
-			debugf("IDX: %q m=%d f=%o%s (%d blocks)", mf.Name, mf.Modified, mf.Flags, flagComment, len(mf.Blocks))
-		}
-		index = append(index, mf)
-	}
-	return index
-}
-
-func (m *Model) AddConnection(conn io.ReadWriteCloser, nodeID string) {
-	node := protocol.NewConnection(nodeID, conn, conn, m)
-
-	m.Lock()
-	m.nodes[nodeID] = node
-	m.rawConn[nodeID] = conn
-	m.Unlock()
-
-	infoln("Connected to node", nodeID)
-
-	m.RLock()
-	idx := m.protocolIndex()
-	m.RUnlock()
-
-	go func() {
-		node.Index(idx)
-		infoln("Sent initial index to node", nodeID)
-	}()
-}
-
-func fileFromFileInfo(f protocol.FileInfo) File {
-	var blocks []Block
-	var offset uint64
-	for _, b := range f.Blocks {
-		blocks = append(blocks, Block{
-			Offset: offset,
-			Length: b.Length,
-			Hash:   b.Hash,
-		})
-		offset += uint64(b.Length)
-	}
-	return File{
-		Name:     f.Name,
-		Flags:    f.Flags,
-		Modified: int64(f.Modified),
-		Blocks:   blocks,
-	}
-}
-
-func fileInfoFromFile(f File) protocol.FileInfo {
-	var blocks []protocol.BlockInfo
-	for _, b := range f.Blocks {
-		blocks = append(blocks, protocol.BlockInfo{
-			Length: b.Length,
-			Hash:   b.Hash,
-		})
-	}
-	return protocol.FileInfo{
-		Name:     f.Name,
-		Flags:    f.Flags,
-		Modified: int64(f.Modified),
-		Blocks:   blocks,
-	}
-}

model/blocks.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"bytes"
@@ -6,18 +6,16 @@ import (
 	"io"
 )
 
-type BlockList []Block
-
 type Block struct {
-	Offset uint64
-	Length uint32
+	Offset int64
+	Size   uint32
 	Hash   []byte
 }
 
 // Blocks returns the blockwise hash of the reader.
-func Blocks(r io.Reader, blocksize int) (BlockList, error) {
-	var blocks BlockList
-	var offset uint64
+func Blocks(r io.Reader, blocksize int) ([]Block, error) {
+	var blocks []Block
+	var offset int64
 	for {
 		lr := &io.LimitedReader{r, int64(blocksize)}
 		hf := sha256.New()
@@ -32,19 +30,28 @@ func Blocks(r io.Reader, blocksize int) (BlockList, error) {
 
 		b := Block{
 			Offset: offset,
-			Length: uint32(n),
+			Size:   uint32(n),
 			Hash:   hf.Sum(nil),
 		}
 		blocks = append(blocks, b)
-		offset += uint64(n)
+		offset += int64(n)
+	}
+
+	if len(blocks) == 0 {
+		// Empty file
+		blocks = append(blocks, Block{
+			Offset: 0,
+			Size:   0,
+			Hash:   []uint8{0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55},
+		})
 	}
 
 	return blocks, nil
 }
 
-// To returns the list of blocks necessary to transform src into dst.
-// Both block lists must have been created with the same block size.
-func (src BlockList) To(tgt BlockList) (have, need BlockList) {
+// BlockDiff returns lists of common and missing (to transform src into tgt)
+// blocks. Both block lists must have been created with the same block size.
+func BlockDiff(src, tgt []Block) (have, need []Block) {
 	if len(tgt) == 0 && len(src) != 0 {
 		return nil, nil
 	}

model/blocks_test.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 import (
 	"bytes"
@@ -11,7 +11,8 @@ var blocksTestData = []struct {
 	blocksize int
 	hash      []string
 }{
-	{[]byte(""), 1024, []string{}},
+	{[]byte(""), 1024, []string{
+		"e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"}},
 	{[]byte("contents"), 1024, []string{
 		"d1b2a59fbea7e20077af9f91b27e95e865061b270be03ff539ab3b73587882e8"}},
 	{[]byte("contents"), 9, []string{
@@ -52,7 +53,7 @@ func TestBlocks(t *testing.T) {
 			t.Fatalf("Incorrect number of blocks %d != %d", l, len(test.hash))
 		} else {
 			i := 0
-			for off := uint64(0); off < uint64(len(test.data)); off += uint64(test.blocksize) {
+			for off := int64(0); off < int64(len(test.data)); off += int64(test.blocksize) {
 				if blocks[i].Offset != off {
 					t.Errorf("Incorrect offset for block %d: %d != %d", i, blocks[i].Offset, off)
 				}
@@ -61,8 +62,8 @@ func TestBlocks(t *testing.T) {
 				if rem := len(test.data) - int(off); bs > rem {
 					bs = rem
 				}
-				if int(blocks[i].Length) != bs {
-					t.Errorf("Incorrect length for block %d: %d != %d", i, blocks[i].Length, bs)
+				if int(blocks[i].Size) != bs {
+					t.Errorf("Incorrect length for block %d: %d != %d", i, blocks[i].Size, bs)
 				}
 				if h := fmt.Sprintf("%x", blocks[i].Hash); h != test.hash[i] {
 					t.Errorf("Incorrect block hash %q != %q", h, test.hash[i])
@@ -86,7 +87,7 @@ var diffTestData = []struct {
 	{"contents", "cantents", 3, []Block{{0, 3, nil}}},
 	{"contents", "contants", 3, []Block{{3, 3, nil}}},
 	{"contents", "cantants", 3, []Block{{0, 3, nil}, {3, 3, nil}}},
-	{"contents", "", 3, nil},
+	{"contents", "", 3, []Block{{0, 0, nil}}},
 	{"", "contents", 3, []Block{{0, 3, nil}, {3, 3, nil}, {6, 2, nil}}},
 	{"con", "contents", 3, []Block{{3, 3, nil}, {6, 2, nil}}},
 	{"contents", "con", 3, nil},
@@ -98,7 +99,7 @@ func TestDiff(t *testing.T) {
 	for i, test := range diffTestData {
 		a, _ := Blocks(bytes.NewBufferString(test.a), test.s)
 		b, _ := Blocks(bytes.NewBufferString(test.b), test.s)
-		_, d := a.To(b)
+		_, d := BlockDiff(a, b)
 		if len(d) != len(test.d) {
 			t.Fatalf("Incorrect length for diff %d; %d != %d", i, len(d), len(test.d))
 		} else {
@@ -106,8 +107,8 @@ func TestDiff(t *testing.T) {
 				if d[j].Offset != test.d[j].Offset {
 					t.Errorf("Incorrect offset for diff %d block %d; %d != %d", i, j, d[j].Offset, test.d[j].Offset)
 				}
-				if d[j].Length != test.d[j].Length {
-					t.Errorf("Incorrect length for diff %d block %d; %d != %d", i, j, d[j].Length, test.d[j].Length)
+				if d[j].Size != test.d[j].Size {
+					t.Errorf("Incorrect length for diff %d block %d; %d != %d", i, j, d[j].Size, test.d[j].Size)
 				}
 			}
 		}

model/filemonitor.go

@@ -0,0 +1,173 @@
+package model
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"log"
+	"os"
+	"path"
+	"sync"
+	"time"
+
+	"github.com/calmh/syncthing/buffers"
+)
+
+type fileMonitor struct {
+	name        string // in-repo name
+	path        string // full path
+	writeDone   sync.WaitGroup
+	model       *Model
+	global      File
+	localBlocks []Block
+	copyError   error
+	writeError  error
+}
+
+func (m *fileMonitor) FileBegins(cc <-chan content) error {
+	if m.model.trace["file"] {
+		log.Printf("FILE: FileBegins: " + m.name)
+	}
+
+	tmp := tempName(m.path, m.global.Modified)
+
+	dir := path.Dir(tmp)
+	_, err := os.Stat(dir)
+	if err != nil && os.IsNotExist(err) {
+		err = os.MkdirAll(dir, 0777)
+		if err != nil {
+			return err
+		}
+	}
+
+	outFile, err := os.Create(tmp)
+	if err != nil {
+		return err
+	}
+
+	m.writeDone.Add(1)
+
+	var writeWg sync.WaitGroup
+	if len(m.localBlocks) > 0 {
+		writeWg.Add(1)
+		inFile, err := os.Open(m.path)
+		if err != nil {
+			return err
+		}
+
+		// Copy local blocks, close infile when done
+		go m.copyLocalBlocks(inFile, outFile, &writeWg)
+	}
+
+	// Write remote blocks,
+	writeWg.Add(1)
+	go m.copyRemoteBlocks(cc, outFile, &writeWg)
+
+	// Wait for both writing routines, then close the outfile
+	go func() {
+		writeWg.Wait()
+		outFile.Close()
+		m.writeDone.Done()
+	}()
+
+	return nil
+}
+
+func (m *fileMonitor) copyLocalBlocks(inFile, outFile *os.File, writeWg *sync.WaitGroup) {
+	defer inFile.Close()
+	defer writeWg.Done()
+
+	var buf = buffers.Get(BlockSize)
+	defer buffers.Put(buf)
+
+	for _, lb := range m.localBlocks {
+		buf = buf[:lb.Size]
+		_, err := inFile.ReadAt(buf, lb.Offset)
+		if err != nil {
+			m.copyError = err
+			return
+		}
+		_, err = outFile.WriteAt(buf, lb.Offset)
+		if err != nil {
+			m.copyError = err
+			return
+		}
+	}
+}
+
+func (m *fileMonitor) copyRemoteBlocks(cc <-chan content, outFile *os.File, writeWg *sync.WaitGroup) {
+	defer writeWg.Done()
+
+	for content := range cc {
+		_, err := outFile.WriteAt(content.data, content.offset)
+		buffers.Put(content.data)
+		if err != nil {
+			m.writeError = err
+			return
+		}
+	}
+}
+
+func (m *fileMonitor) FileDone() error {
+	if m.model.trace["file"] {
+		log.Printf("FILE: FileDone: " + m.name)
+	}
+
+	m.writeDone.Wait()
+
+	tmp := tempName(m.path, m.global.Modified)
+	defer os.Remove(tmp)
+
+	if m.copyError != nil {
+		return m.copyError
+	}
+	if m.writeError != nil {
+		return m.writeError
+	}
+
+	err := hashCheck(tmp, m.global.Blocks)
+	if err != nil {
+		return err
+	}
+
+	err = os.Chtimes(tmp, time.Unix(m.global.Modified, 0), time.Unix(m.global.Modified, 0))
+	if err != nil {
+		return err
+	}
+
+	err = os.Chmod(tmp, os.FileMode(m.global.Flags&0777))
+	if err != nil {
+		return err
+	}
+
+	err = os.Rename(tmp, m.path)
+	if err != nil {
+		return err
+	}
+
+	m.model.updateLocal(m.global)
+	return nil
+}
+
+func hashCheck(name string, correct []Block) error {
+	rf, err := os.Open(name)
+	if err != nil {
+		return err
+	}
+	defer rf.Close()
+
+	current, err := Blocks(rf, BlockSize)
+	if err != nil {
+		return err
+	}
+	if len(current) != len(correct) {
+		return errors.New("incorrect number of blocks")
+	}
+	for i := range current {
+		if bytes.Compare(current[i].Hash, correct[i].Hash) != 0 {
+			return fmt.Errorf("hash mismatch: %x != %x", current[i], correct[i])
+		}
+	}
+
+	return nil
+}

model/filequeue.go

@@ -0,0 +1,236 @@
+package model
+
+import (
+	"log"
+	"sort"
+	"sync"
+	"time"
+)
+
+type Monitor interface {
+	FileBegins(<-chan content) error
+	FileDone() error
+}
+
+type FileQueue struct {
+	files        queuedFileList
+	sorted       bool
+	fmut         sync.Mutex // protects files and sorted
+	availability map[string][]string
+	amut         sync.Mutex // protects availability
+	queued       map[string]bool
+}
+
+type queuedFile struct {
+	name         string
+	blocks       []Block
+	activeBlocks []bool
+	given        int
+	remaining    int
+	channel      chan content
+	nodes        []string
+	nodesChecked time.Time
+	monitor      Monitor
+}
+
+type content struct {
+	offset int64
+	data   []byte
+}
+
+type queuedFileList []queuedFile
+
+func (l queuedFileList) Len() int { return len(l) }
+
+func (l queuedFileList) Swap(a, b int) { l[a], l[b] = l[b], l[a] }
+
+func (l queuedFileList) Less(a, b int) bool {
+	// Sort by most blocks already given out, then alphabetically
+	if l[a].given != l[b].given {
+		return l[a].given > l[b].given
+	}
+	return l[a].name < l[b].name
+}
+
+type queuedBlock struct {
+	name  string
+	block Block
+	index int
+}
+
+func NewFileQueue() *FileQueue {
+	return &FileQueue{
+		availability: make(map[string][]string),
+		queued:       make(map[string]bool),
+	}
+}
+
+func (q *FileQueue) Add(name string, blocks []Block, monitor Monitor) {
+	q.fmut.Lock()
+	defer q.fmut.Unlock()
+
+	if q.queued[name] {
+		return
+	}
+
+	q.files = append(q.files, queuedFile{
+		name:         name,
+		blocks:       blocks,
+		activeBlocks: make([]bool, len(blocks)),
+		remaining:    len(blocks),
+		channel:      make(chan content),
+		monitor:      monitor,
+	})
+	q.queued[name] = true
+	q.sorted = false
+}
+
+func (q *FileQueue) Len() int {
+	q.fmut.Lock()
+	defer q.fmut.Unlock()
+
+	return len(q.files)
+}
+
+func (q *FileQueue) Get(nodeID string) (queuedBlock, bool) {
+	q.fmut.Lock()
+	defer q.fmut.Unlock()
+
+	if !q.sorted {
+		sort.Sort(q.files)
+		q.sorted = true
+	}
+
+	for i := range q.files {
+		qf := &q.files[i]
+
+		q.amut.Lock()
+		av := q.availability[qf.name]
+		q.amut.Unlock()
+
+		if len(av) == 0 {
+			// Noone has the file we want; abort.
+			if qf.remaining != len(qf.blocks) {
+				// We have already started on this file; close it down
+				close(qf.channel)
+				if mon := qf.monitor; mon != nil {
+					mon.FileDone()
+				}
+			}
+			delete(q.queued, qf.name)
+			q.deleteAt(i)
+			return queuedBlock{}, false
+		}
+
+		for _, ni := range av {
+			// Find and return the next block in the queue
+			if ni == nodeID {
+				for j, b := range qf.blocks {
+					if !qf.activeBlocks[j] {
+						qf.activeBlocks[j] = true
+						qf.given++
+						return queuedBlock{
+							name:  qf.name,
+							block: b,
+							index: j,
+						}, true
+					}
+				}
+				break
+			}
+		}
+	}
+
+	// We found nothing to do
+	return queuedBlock{}, false
+}
+
+func (q *FileQueue) Done(file string, offset int64, data []byte) {
+	q.fmut.Lock()
+	defer q.fmut.Unlock()
+
+	c := content{
+		offset: offset,
+		data:   data,
+	}
+	for i := range q.files {
+		qf := &q.files[i]
+
+		if qf.name == file {
+			if qf.monitor != nil && qf.remaining == len(qf.blocks) {
+				err := qf.monitor.FileBegins(qf.channel)
+				if err != nil {
+					log.Printf("WARNING: %s: %v (not synced)", qf.name, err)
+					delete(q.queued, qf.name)
+					q.deleteAt(i)
+					return
+				}
+			}
+
+			qf.channel <- c
+			qf.remaining--
+
+			if qf.remaining == 0 {
+				close(qf.channel)
+				if qf.monitor != nil {
+					err := qf.monitor.FileDone()
+					if err != nil {
+						log.Printf("WARNING: %s: %v", qf.name, err)
+					}
+				}
+				delete(q.queued, qf.name)
+				q.deleteAt(i)
+			}
+			return
+		}
+	}
+	panic("unreachable")
+}
+
+func (q *FileQueue) QueuedFiles() (files []string) {
+	q.fmut.Lock()
+	defer q.fmut.Unlock()
+
+	for _, qf := range q.files {
+		files = append(files, qf.name)
+	}
+	return
+}
+
+func (q *FileQueue) deleteAt(i int) {
+	q.files = q.files[:i+copy(q.files[i:], q.files[i+1:])]
+}
+
+func (q *FileQueue) deleteFile(n string) {
+	for i, file := range q.files {
+		if n == file.name {
+			q.deleteAt(i)
+			delete(q.queued, file.name)
+			return
+		}
+	}
+}
+
+func (q *FileQueue) SetAvailable(file string, nodes []string) {
+	q.amut.Lock()
+	defer q.amut.Unlock()
+
+	q.availability[file] = nodes
+}
+
+func (q *FileQueue) RemoveAvailable(toRemove string) {
+	q.amut.Lock()
+	defer q.amut.Unlock()
+
+	for file, nodes := range q.availability {
+		for i, node := range nodes {
+			if node == toRemove {
+				q.availability[file] = nodes[:i+copy(nodes[i:], nodes[i+1:])]
+				if len(q.availability[file]) == 0 {
+					q.deleteFile(file)
+				}
+			}
+			break
+		}
+	}
+}

model/filequeue_test.go

@@ -0,0 +1,277 @@
+package model
+
+import (
+	"reflect"
+	"sync"
+	"sync/atomic"
+	"testing"
+)
+
+func TestFileQueueAdd(t *testing.T) {
+	q := NewFileQueue()
+	q.Add("foo", nil, nil)
+}
+
+func TestFileQueueAddSorting(t *testing.T) {
+	q := NewFileQueue()
+	q.SetAvailable("zzz", []string{"nodeID"})
+	q.SetAvailable("aaa", []string{"nodeID"})
+
+	q.Add("zzz", []Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
+	q.Add("aaa", []Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
+	b, _ := q.Get("nodeID")
+	if b.name != "aaa" {
+		t.Errorf("Incorrectly sorted get: %+v", b)
+	}
+
+	q = NewFileQueue()
+	q.SetAvailable("zzz", []string{"nodeID"})
+	q.SetAvailable("aaa", []string{"nodeID"})
+
+	q.Add("zzz", []Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
+	b, _ = q.Get("nodeID") // Start on zzzz
+	if b.name != "zzz" {
+		t.Errorf("Incorrectly sorted get: %+v", b)
+	}
+	q.Add("aaa", []Block{{Offset: 0, Size: 128}, {Offset: 128, Size: 128}}, nil)
+	b, _ = q.Get("nodeID")
+	if b.name != "zzz" {
+		// Continue rather than starting a new file
+		t.Errorf("Incorrectly sorted get: %+v", b)
+	}
+}
+
+func TestFileQueueLen(t *testing.T) {
+	q := NewFileQueue()
+	q.Add("foo", nil, nil)
+	q.Add("bar", nil, nil)
+
+	if l := q.Len(); l != 2 {
+		t.Errorf("Incorrect len %d != 2 after adds", l)
+	}
+}
+
+func TestFileQueueGet(t *testing.T) {
+	q := NewFileQueue()
+	q.SetAvailable("foo", []string{"nodeID"})
+	q.SetAvailable("bar", []string{"nodeID"})
+
+	q.Add("foo", []Block{
+		{Offset: 0, Size: 128, Hash: []byte("some foo hash bytes")},
+		{Offset: 128, Size: 128, Hash: []byte("some other foo hash bytes")},
+		{Offset: 256, Size: 128, Hash: []byte("more foo hash bytes")},
+	}, nil)
+	q.Add("bar", []Block{
+		{Offset: 0, Size: 128, Hash: []byte("some bar hash bytes")},
+		{Offset: 128, Size: 128, Hash: []byte("some other bar hash bytes")},
+	}, nil)
+
+	// First get should return the first block of the first file
+
+	expected := queuedBlock{
+		name: "bar",
+		block: Block{
+			Offset: 0,
+			Size:   128,
+			Hash:   []byte("some bar hash bytes"),
+		},
+	}
+	actual, ok := q.Get("nodeID")
+
+	if !ok {
+		t.Error("Unexpected non-OK Get()")
+	}
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("Incorrect block returned (first)\n  E: %+v\n  A: %+v", expected, actual)
+	}
+
+	// Second get should return the next block of the first file
+
+	expected = queuedBlock{
+		name: "bar",
+		block: Block{
+			Offset: 128,
+			Size:   128,
+			Hash:   []byte("some other bar hash bytes"),
+		},
+		index: 1,
+	}
+	actual, ok = q.Get("nodeID")
+
+	if !ok {
+		t.Error("Unexpected non-OK Get()")
+	}
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("Incorrect block returned (second)\n  E: %+v\n  A: %+v", expected, actual)
+	}
+
+	// Third get should return the first block of the second file
+
+	expected = queuedBlock{
+		name: "foo",
+		block: Block{
+			Offset: 0,
+			Size:   128,
+			Hash:   []byte("some foo hash bytes"),
+		},
+	}
+	actual, ok = q.Get("nodeID")
+
+	if !ok {
+		t.Error("Unexpected non-OK Get()")
+	}
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("Incorrect block returned (third)\n  E: %+v\n  A: %+v", expected, actual)
+	}
+}
+
+/*
+func TestFileQueueDone(t *testing.T) {
+	ch := make(chan content)
+	var recv sync.WaitGroup
+	recv.Add(1)
+	go func() {
+		content := <-ch
+		if bytes.Compare(content.data, []byte("first block bytes")) != 0 {
+			t.Error("Incorrect data in first content block")
+		}
+
+		content = <-ch
+		if bytes.Compare(content.data, []byte("second block bytes")) != 0 {
+			t.Error("Incorrect data in second content block")
+		}
+
+		_, ok := <-ch
+		if ok {
+			t.Error("Content channel not closed")
+		}
+
+		recv.Done()
+	}()
+
+	q := FileQueue{resolver: fakeResolver{}}
+	q.Add("foo", []Block{
+		{Offset: 0, Length: 128, Hash: []byte("some foo hash bytes")},
+		{Offset: 128, Length: 128, Hash: []byte("some other foo hash bytes")},
+	}, ch)
+
+	b0, _ := q.Get("nodeID")
+	b1, _ := q.Get("nodeID")
+
+	q.Done(b0.name, b0.block.Offset, []byte("first block bytes"))
+	q.Done(b1.name, b1.block.Offset, []byte("second block bytes"))
+
+	recv.Wait()
+
+	// Queue should now have one file less
+
+	if l := q.Len(); l != 0 {
+		t.Error("Queue not empty")
+	}
+
+	_, ok := q.Get("nodeID")
+	if ok {
+		t.Error("Unexpected OK Get()")
+	}
+}
+*/
+
+func TestFileQueueGetNodeIDs(t *testing.T) {
+	q := NewFileQueue()
+	q.SetAvailable("a-foo", []string{"nodeID", "a"})
+	q.SetAvailable("b-bar", []string{"nodeID", "b"})
+
+	q.Add("a-foo", []Block{
+		{Offset: 0, Size: 128, Hash: []byte("some foo hash bytes")},
+		{Offset: 128, Size: 128, Hash: []byte("some other foo hash bytes")},
+		{Offset: 256, Size: 128, Hash: []byte("more foo hash bytes")},
+	}, nil)
+	q.Add("b-bar", []Block{
+		{Offset: 0, Size: 128, Hash: []byte("some bar hash bytes")},
+		{Offset: 128, Size: 128, Hash: []byte("some other bar hash bytes")},
+	}, nil)
+
+	expected := queuedBlock{
+		name: "b-bar",
+		block: Block{
+			Offset: 0,
+			Size:   128,
+			Hash:   []byte("some bar hash bytes"),
+		},
+	}
+	actual, ok := q.Get("b")
+	if !ok {
+		t.Error("Unexpected non-OK Get()")
+	}
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("Incorrect block returned\n  E: %+v\n  A: %+v", expected, actual)
+	}
+
+	expected = queuedBlock{
+		name: "a-foo",
+		block: Block{
+			Offset: 0,
+			Size:   128,
+			Hash:   []byte("some foo hash bytes"),
+		},
+	}
+	actual, ok = q.Get("a")
+	if !ok {
+		t.Error("Unexpected non-OK Get()")
+	}
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("Incorrect block returned\n  E: %+v\n  A: %+v", expected, actual)
+	}
+
+	expected = queuedBlock{
+		name: "a-foo",
+		block: Block{
+			Offset: 128,
+			Size:   128,
+			Hash:   []byte("some other foo hash bytes"),
+		},
+		index: 1,
+	}
+	actual, ok = q.Get("nodeID")
+	if !ok {
+		t.Error("Unexpected non-OK Get()")
+	}
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("Incorrect block returned\n  E: %+v\n  A: %+v", expected, actual)
+	}
+}
+
+func TestFileQueueThreadHandling(t *testing.T) {
+	// This should pass with go test -race
+
+	const n = 100
+	var total int
+	var blocks []Block
+	for i := 1; i <= n; i++ {
+		blocks = append(blocks, Block{Offset: int64(i), Size: 1})
+		total += i
+	}
+
+	q := NewFileQueue()
+	q.Add("foo", blocks, nil)
+	q.SetAvailable("foo", []string{"nodeID"})
+
+	var start = make(chan bool)
+	var gotTot uint32
+	var wg sync.WaitGroup
+	wg.Add(n)
+	for i := 1; i <= n; i++ {
+		go func() {
+			<-start
+			b, _ := q.Get("nodeID")
+			atomic.AddUint32(&gotTot, uint32(b.block.Offset))
+			wg.Done()
+		}()
+	}
+
+	close(start)
+	wg.Wait()
+	if int(gotTot) != total {
+		t.Error("Total mismatch; %d != %d", gotTot, total)
+	}
+}

model/model.go

@@ -0,0 +1,888 @@
+package model
+
+import (
+	"crypto/sha1"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"os"
+	"path"
+	"sync"
+	"time"
+
+	"github.com/calmh/syncthing/buffers"
+	"github.com/calmh/syncthing/protocol"
+)
+
+type Model struct {
+	dir string
+
+	global    map[string]File // the latest version of each file as it exists in the cluster
+	gmut      sync.RWMutex    // protects global
+	local     map[string]File // the files we currently have locally on disk
+	lmut      sync.RWMutex    // protects local
+	remote    map[string]map[string]File
+	rmut      sync.RWMutex // protects remote
+	protoConn map[string]Connection
+	rawConn   map[string]io.Closer
+	pmut      sync.RWMutex // protects protoConn and rawConn
+
+	// Queue for files to fetch. fq can call back into the model, so we must ensure
+	// to hold no locks when calling methods on fq.
+	fq *FileQueue
+	dq chan File // queue for files to delete
+
+	updatedLocal        int64 // timestamp of last update to local
+	updateGlobal        int64 // timestamp of last update to remote
+	lastIdxBcast        time.Time
+	lastIdxBcastRequest time.Time
+	umut                sync.RWMutex // provides updated* and lastIdx*
+
+	rwRunning bool
+	delete    bool
+	initmut   sync.Mutex // protects rwRunning and delete
+
+	trace map[string]bool
+
+	sup suppressor
+
+	parallelRequests int
+	limitRequestRate chan struct{}
+
+	imut sync.Mutex // protects Index
+}
+
+type Connection interface {
+	ID() string
+	Index([]protocol.FileInfo)
+	Request(name string, offset int64, size uint32, hash []byte) ([]byte, error)
+	Statistics() protocol.Statistics
+	Option(key string) string
+}
+
+const (
+	idxBcastHoldtime = 15 * time.Second  // Wait at least this long after the last index modification
+	idxBcastMaxDelay = 120 * time.Second // Unless we've already waited this long
+
+	minFileHoldTimeS = 60  // Never allow file changes more often than this
+	maxFileHoldTimeS = 600 // Always allow file changes at least this often
+)
+
+var (
+	ErrNoSuchFile = errors.New("no such file")
+	ErrInvalid    = errors.New("file is invalid")
+)
+
+// NewModel creates and starts a new model. The model starts in read-only mode,
+// where it sends index information to connected peers and responds to requests
+// for file data without altering the local repository in any way.
+func NewModel(dir string, maxChangeBw int) *Model {
+	m := &Model{
+		dir:          dir,
+		global:       make(map[string]File),
+		local:        make(map[string]File),
+		remote:       make(map[string]map[string]File),
+		protoConn:    make(map[string]Connection),
+		rawConn:      make(map[string]io.Closer),
+		lastIdxBcast: time.Now(),
+		trace:        make(map[string]bool),
+		sup:          suppressor{threshold: int64(maxChangeBw)},
+		fq:           NewFileQueue(),
+		dq:           make(chan File),
+	}
+
+	go m.broadcastIndexLoop()
+	return m
+}
+
+func (m *Model) LimitRate(kbps int) {
+	m.limitRequestRate = make(chan struct{}, kbps)
+	n := kbps/10 + 1
+	go func() {
+		for {
+			time.Sleep(100 * time.Millisecond)
+			for i := 0; i < n; i++ {
+				select {
+				case m.limitRequestRate <- struct{}{}:
+				}
+			}
+		}
+	}()
+}
+
+// Trace enables trace logging of the given facility. This is a debugging function; grep for m.trace.
+func (m *Model) Trace(t string) {
+	m.trace[t] = true
+}
+
+// StartRW starts read/write processing on the current model. When in
+// read/write mode the model will attempt to keep in sync with the cluster by
+// pulling needed files from peer nodes.
+func (m *Model) StartRW(del bool, threads int) {
+	m.initmut.Lock()
+	defer m.initmut.Unlock()
+
+	if m.rwRunning {
+		panic("starting started model")
+	}
+
+	m.rwRunning = true
+	m.delete = del
+	m.parallelRequests = threads
+
+	go m.cleanTempFiles()
+	if del {
+		go m.deleteLoop()
+	}
+}
+
+// Generation returns an opaque integer that is guaranteed to increment on
+// every change to the local repository or global model.
+func (m *Model) Generation() int64 {
+	m.umut.RLock()
+	defer m.umut.RUnlock()
+
+	return m.updatedLocal + m.updateGlobal
+}
+
+func (m *Model) LocalAge() float64 {
+	m.umut.RLock()
+	defer m.umut.RUnlock()
+
+	return time.Since(time.Unix(m.updatedLocal, 0)).Seconds()
+}
+
+type ConnectionInfo struct {
+	protocol.Statistics
+	Address       string
+	ClientID      string
+	ClientVersion string
+}
+
+// ConnectionStats returns a map with connection statistics for each connected node.
+func (m *Model) ConnectionStats() map[string]ConnectionInfo {
+	type remoteAddrer interface {
+		RemoteAddr() net.Addr
+	}
+
+	m.pmut.RLock()
+
+	var res = make(map[string]ConnectionInfo)
+	for node, conn := range m.protoConn {
+		ci := ConnectionInfo{
+			Statistics:    conn.Statistics(),
+			ClientID:      conn.Option("clientId"),
+			ClientVersion: conn.Option("clientVersion"),
+		}
+		if nc, ok := m.rawConn[node].(remoteAddrer); ok {
+			ci.Address = nc.RemoteAddr().String()
+		}
+		res[node] = ci
+	}
+
+	m.pmut.RUnlock()
+	return res
+}
+
+// LocalSize returns the number of files, deleted files and total bytes for all
+// files in the global model.
+func (m *Model) GlobalSize() (files, deleted, bytes int) {
+	m.gmut.RLock()
+
+	for _, f := range m.global {
+		if f.Flags&protocol.FlagDeleted == 0 {
+			files++
+			bytes += f.Size()
+		} else {
+			deleted++
+		}
+	}
+
+	m.gmut.RUnlock()
+	return
+}
+
+// LocalSize returns the number of files, deleted files and total bytes for all
+// files in the local repository.
+func (m *Model) LocalSize() (files, deleted, bytes int) {
+	m.lmut.RLock()
+
+	for _, f := range m.local {
+		if f.Flags&protocol.FlagDeleted == 0 {
+			files++
+			bytes += f.Size()
+		} else {
+			deleted++
+		}
+	}
+
+	m.lmut.RUnlock()
+	return
+}
+
+// InSyncSize returns the number and total byte size of the local files that
+// are in sync with the global model.
+func (m *Model) InSyncSize() (files, bytes int) {
+	m.gmut.RLock()
+	m.lmut.RLock()
+
+	for n, f := range m.local {
+		if gf, ok := m.global[n]; ok && f.Equals(gf) {
+			files++
+			bytes += f.Size()
+		}
+	}
+
+	m.lmut.RUnlock()
+	m.gmut.RUnlock()
+	return
+}
+
+// NeedFiles returns the list of currently needed files and the total size.
+func (m *Model) NeedFiles() (files []File, bytes int) {
+	qf := m.fq.QueuedFiles()
+
+	m.gmut.RLock()
+
+	for _, n := range qf {
+		f := m.global[n]
+		files = append(files, f)
+		bytes += f.Size()
+	}
+
+	m.gmut.RUnlock()
+	return
+}
+
+// Index is called when a new node is connected and we receive their full index.
+// Implements the protocol.Model interface.
+func (m *Model) Index(nodeID string, fs []protocol.FileInfo) {
+	var files = make([]File, len(fs))
+	for i := range fs {
+		files[i] = fileFromFileInfo(fs[i])
+	}
+
+	m.imut.Lock()
+	defer m.imut.Unlock()
+
+	if m.trace["net"] {
+		log.Printf("NET IDX(in): %s: %d files", nodeID, len(fs))
+	}
+
+	repo := make(map[string]File)
+	for _, f := range files {
+		m.indexUpdate(repo, f)
+	}
+
+	m.rmut.Lock()
+	m.remote[nodeID] = repo
+	m.rmut.Unlock()
+
+	m.recomputeGlobal()
+	m.recomputeNeedForFiles(files)
+}
+
+// IndexUpdate is called for incremental updates to connected nodes' indexes.
+// Implements the protocol.Model interface.
+func (m *Model) IndexUpdate(nodeID string, fs []protocol.FileInfo) {
+	var files = make([]File, len(fs))
+	for i := range fs {
+		files[i] = fileFromFileInfo(fs[i])
+	}
+
+	m.imut.Lock()
+	defer m.imut.Unlock()
+
+	if m.trace["net"] {
+		log.Printf("NET IDXUP(in): %s: %d files", nodeID, len(files))
+	}
+
+	m.rmut.Lock()
+	repo, ok := m.remote[nodeID]
+	if !ok {
+		log.Printf("WARNING: Index update from node %s that does not have an index", nodeID)
+		m.rmut.Unlock()
+		return
+	}
+
+	for _, f := range files {
+		m.indexUpdate(repo, f)
+	}
+	m.rmut.Unlock()
+
+	m.recomputeGlobal()
+	m.recomputeNeedForFiles(files)
+}
+
+func (m *Model) indexUpdate(repo map[string]File, f File) {
+	if m.trace["idx"] {
+		var flagComment string
+		if f.Flags&protocol.FlagDeleted != 0 {
+			flagComment = " (deleted)"
+		}
+		log.Printf("IDX(in): %q m=%d f=%o%s v=%d (%d blocks)", f.Name, f.Modified, f.Flags, flagComment, f.Version, len(f.Blocks))
+	}
+
+	if extraFlags := f.Flags &^ (protocol.FlagInvalid | protocol.FlagDeleted | 0xfff); extraFlags != 0 {
+		log.Printf("WARNING: IDX(in): Unknown flags 0x%x in index record %+v", extraFlags, f)
+		return
+	}
+
+	repo[f.Name] = f
+}
+
+// Close removes the peer from the model and closes the underlying connection if possible.
+// Implements the protocol.Model interface.
+func (m *Model) Close(node string, err error) {
+	m.fq.RemoveAvailable(node)
+
+	m.pmut.Lock()
+	m.rmut.Lock()
+
+	conn, ok := m.rawConn[node]
+	if ok {
+		conn.Close()
+	}
+
+	delete(m.remote, node)
+	delete(m.protoConn, node)
+	delete(m.rawConn, node)
+
+	m.rmut.Unlock()
+	m.pmut.Unlock()
+
+	m.recomputeGlobal()
+	m.recomputeNeedForGlobal()
+}
+
+// Request returns the specified data segment by reading it from local disk.
+// Implements the protocol.Model interface.
+func (m *Model) Request(nodeID, name string, offset int64, size uint32, hash []byte) ([]byte, error) {
+	// Verify that the requested file exists in the local and global model.
+	m.lmut.RLock()
+	lf, localOk := m.local[name]
+	m.lmut.RUnlock()
+
+	m.gmut.RLock()
+	_, globalOk := m.global[name]
+	m.gmut.RUnlock()
+
+	if !localOk || !globalOk {
+		log.Printf("SECURITY (nonexistent file) REQ(in): %s: %q o=%d s=%d h=%x", nodeID, name, offset, size, hash)
+		return nil, ErrNoSuchFile
+	}
+	if lf.Flags&protocol.FlagInvalid != 0 {
+		return nil, ErrInvalid
+	}
+
+	if m.trace["net"] && nodeID != "<local>" {
+		log.Printf("NET REQ(in): %s: %q o=%d s=%d h=%x", nodeID, name, offset, size, hash)
+	}
+	fn := path.Join(m.dir, name)
+	fd, err := os.Open(fn) // XXX: Inefficient, should cache fd?
+	if err != nil {
+		return nil, err
+	}
+	defer fd.Close()
+
+	buf := buffers.Get(int(size))
+	_, err = fd.ReadAt(buf, offset)
+	if err != nil {
+		return nil, err
+	}
+
+	if m.limitRequestRate != nil {
+		for s := 0; s < len(buf); s += 1024 {
+			<-m.limitRequestRate
+		}
+	}
+
+	return buf, nil
+}
+
+// ReplaceLocal replaces the local repository index with the given list of files.
+func (m *Model) ReplaceLocal(fs []File) {
+	var updated bool
+	var newLocal = make(map[string]File)
+
+	m.lmut.RLock()
+	for _, f := range fs {
+		newLocal[f.Name] = f
+		if ef := m.local[f.Name]; !ef.Equals(f) {
+			updated = true
+		}
+	}
+	m.lmut.RUnlock()
+
+	if m.markDeletedLocals(newLocal) {
+		updated = true
+	}
+
+	m.lmut.RLock()
+	if len(newLocal) != len(m.local) {
+		updated = true
+	}
+	m.lmut.RUnlock()
+
+	if updated {
+		m.lmut.Lock()
+		m.local = newLocal
+		m.lmut.Unlock()
+
+		m.recomputeGlobal()
+		m.recomputeNeedForGlobal()
+
+		m.umut.Lock()
+		m.updatedLocal = time.Now().Unix()
+		m.lastIdxBcastRequest = time.Now()
+		m.umut.Unlock()
+	}
+}
+
+// SeedLocal replaces the local repository index with the given list of files,
+// in protocol data types. Does not track deletes, should only be used to seed
+// the local index from a cache file at startup.
+func (m *Model) SeedLocal(fs []protocol.FileInfo) {
+	m.lmut.Lock()
+	m.local = make(map[string]File)
+	for _, f := range fs {
+		m.local[f.Name] = fileFromFileInfo(f)
+	}
+	m.lmut.Unlock()
+
+	m.recomputeGlobal()
+	m.recomputeNeedForGlobal()
+}
+
+// ConnectedTo returns true if we are connected to the named node.
+func (m *Model) ConnectedTo(nodeID string) bool {
+	m.pmut.RLock()
+	_, ok := m.protoConn[nodeID]
+	m.pmut.RUnlock()
+	return ok
+}
+
+// RepoID returns a unique ID representing the current repository location.
+func (m *Model) RepoID() string {
+	return fmt.Sprintf("%x", sha1.Sum([]byte(m.dir)))
+}
+
+// AddConnection adds a new peer connection to the model. An initial index will
+// be sent to the connected peer, thereafter index updates whenever the local
+// repository changes.
+func (m *Model) AddConnection(rawConn io.Closer, protoConn Connection) {
+	nodeID := protoConn.ID()
+	m.pmut.Lock()
+	m.protoConn[nodeID] = protoConn
+	m.rawConn[nodeID] = rawConn
+	m.pmut.Unlock()
+
+	go func() {
+		idx := m.ProtocolIndex()
+		protoConn.Index(idx)
+	}()
+
+	m.initmut.Lock()
+	rw := m.rwRunning
+	m.initmut.Unlock()
+	if !rw {
+		return
+	}
+
+	for i := 0; i < m.parallelRequests; i++ {
+		i := i
+		go func() {
+			if m.trace["pull"] {
+				log.Println("PULL: Starting", nodeID, i)
+			}
+			for {
+				m.pmut.RLock()
+				if _, ok := m.protoConn[nodeID]; !ok {
+					if m.trace["pull"] {
+						log.Println("PULL: Exiting", nodeID, i)
+					}
+					m.pmut.RUnlock()
+					return
+				}
+				m.pmut.RUnlock()
+
+				qb, ok := m.fq.Get(nodeID)
+				if ok {
+					if m.trace["pull"] {
+						log.Println("PULL: Request", nodeID, i, qb.name, qb.block.Offset)
+					}
+					data, _ := protoConn.Request(qb.name, qb.block.Offset, qb.block.Size, qb.block.Hash)
+					m.fq.Done(qb.name, qb.block.Offset, data)
+				} else {
+					time.Sleep(1 * time.Second)
+				}
+			}
+		}()
+	}
+}
+
+// ProtocolIndex returns the current local index in protocol data types.
+// Must be called with the read lock held.
+func (m *Model) ProtocolIndex() []protocol.FileInfo {
+	var index []protocol.FileInfo
+
+	m.lmut.RLock()
+
+	for _, f := range m.local {
+		mf := fileInfoFromFile(f)
+		if m.trace["idx"] {
+			var flagComment string
+			if mf.Flags&protocol.FlagDeleted != 0 {
+				flagComment = " (deleted)"
+			}
+			log.Printf("IDX(out): %q m=%d f=%o%s v=%d (%d blocks)", mf.Name, mf.Modified, mf.Flags, flagComment, mf.Version, len(mf.Blocks))
+		}
+		index = append(index, mf)
+	}
+
+	m.lmut.RUnlock()
+	return index
+}
+
+func (m *Model) requestGlobal(nodeID, name string, offset int64, size uint32, hash []byte) ([]byte, error) {
+	m.pmut.RLock()
+	nc, ok := m.protoConn[nodeID]
+	m.pmut.RUnlock()
+
+	if !ok {
+		return nil, fmt.Errorf("requestGlobal: no such node: %s", nodeID)
+	}
+
+	if m.trace["net"] {
+		log.Printf("NET REQ(out): %s: %q o=%d s=%d h=%x", nodeID, name, offset, size, hash)
+	}
+
+	return nc.Request(name, offset, size, hash)
+}
+
+func (m *Model) broadcastIndexLoop() {
+	for {
+		m.umut.RLock()
+		bcastRequested := m.lastIdxBcastRequest.After(m.lastIdxBcast)
+		holdtimeExceeded := time.Since(m.lastIdxBcastRequest) > idxBcastHoldtime
+		m.umut.RUnlock()
+
+		maxDelayExceeded := time.Since(m.lastIdxBcast) > idxBcastMaxDelay
+		if bcastRequested && (holdtimeExceeded || maxDelayExceeded) {
+			idx := m.ProtocolIndex()
+
+			var indexWg sync.WaitGroup
+			indexWg.Add(len(m.protoConn))
+
+			m.umut.Lock()
+			m.lastIdxBcast = time.Now()
+			m.umut.Unlock()
+
+			m.pmut.RLock()
+			for _, node := range m.protoConn {
+				node := node
+				if m.trace["net"] {
+					log.Printf("NET IDX(out/loop): %s: %d files", node.ID(), len(idx))
+				}
+				go func() {
+					node.Index(idx)
+					indexWg.Done()
+				}()
+			}
+			m.pmut.RUnlock()
+
+			indexWg.Wait()
+		}
+		time.Sleep(idxBcastHoldtime)
+	}
+}
+
+// markDeletedLocals sets the deleted flag on files that have gone missing locally.
+func (m *Model) markDeletedLocals(newLocal map[string]File) bool {
+	// For every file in the existing local table, check if they are also
+	// present in the new local table. If they are not, check that we already
+	// had the newest version available according to the global table and if so
+	// note the file as having been deleted.
+	var updated bool
+
+	m.gmut.RLock()
+	m.lmut.RLock()
+
+	for n, f := range m.local {
+		if _, ok := newLocal[n]; !ok {
+			if gf := m.global[n]; !gf.NewerThan(f) {
+				if f.Flags&protocol.FlagDeleted == 0 {
+					f.Flags = protocol.FlagDeleted
+					f.Version++
+					f.Blocks = nil
+					updated = true
+				}
+				newLocal[n] = f
+			}
+		}
+	}
+
+	m.lmut.RUnlock()
+	m.gmut.RUnlock()
+
+	return updated
+}
+
+func (m *Model) updateLocal(f File) {
+	var updated bool
+
+	m.lmut.Lock()
+	if ef, ok := m.local[f.Name]; !ok || !ef.Equals(f) {
+		m.local[f.Name] = f
+		updated = true
+	}
+	m.lmut.Unlock()
+
+	if updated {
+		m.recomputeGlobal()
+		// We don't recomputeNeed here for two reasons:
+		// - a need shouldn't have arisen due to having a newer local file
+		// - recomputeNeed might call into fq.Add but we might have been called by
+		//   fq which would be a deadlock on fq
+
+		m.umut.Lock()
+		m.updatedLocal = time.Now().Unix()
+		m.lastIdxBcastRequest = time.Now()
+		m.umut.Unlock()
+	}
+}
+
+/*
+XXX: Not done, needs elegant handling of availability
+
+func (m *Model) recomputeGlobalFor(files []File) bool {
+	m.gmut.Lock()
+	defer m.gmut.Unlock()
+
+	var updated bool
+	for _, f := range files {
+		if gf, ok := m.global[f.Name]; !ok || f.NewerThan(gf) {
+			m.global[f.Name] = f
+			updated = true
+			// Fix availability
+		}
+	}
+	return updated
+}
+*/
+
+func (m *Model) recomputeGlobal() {
+	var newGlobal = make(map[string]File)
+
+	m.lmut.RLock()
+	for n, f := range m.local {
+		newGlobal[n] = f
+	}
+	m.lmut.RUnlock()
+
+	var available = make(map[string][]string)
+
+	m.rmut.RLock()
+	var highestMod int64
+	for nodeID, fs := range m.remote {
+		for n, nf := range fs {
+			if lf, ok := newGlobal[n]; !ok || nf.NewerThan(lf) {
+				newGlobal[n] = nf
+				available[n] = []string{nodeID}
+				if nf.Modified > highestMod {
+					highestMod = nf.Modified
+				}
+			} else if lf.Equals(nf) {
+				available[n] = append(available[n], nodeID)
+			}
+		}
+	}
+	m.rmut.RUnlock()
+
+	for f, ns := range available {
+		m.fq.SetAvailable(f, ns)
+	}
+
+	// Figure out if anything actually changed
+
+	m.gmut.RLock()
+	var updated bool
+	if highestMod > m.updateGlobal || len(newGlobal) != len(m.global) {
+		updated = true
+	} else {
+		for n, f0 := range newGlobal {
+			if f1, ok := m.global[n]; !ok || !f0.Equals(f1) {
+				updated = true
+				break
+			}
+		}
+	}
+	m.gmut.RUnlock()
+
+	if updated {
+		m.gmut.Lock()
+		m.umut.Lock()
+		m.global = newGlobal
+		m.updateGlobal = time.Now().Unix()
+		m.umut.Unlock()
+		m.gmut.Unlock()
+	}
+}
+
+type addOrder struct {
+	n      string
+	remote []Block
+	fm     *fileMonitor
+}
+
+func (m *Model) recomputeNeedForGlobal() {
+	var toDelete []File
+	var toAdd []addOrder
+
+	m.gmut.RLock()
+
+	for _, gf := range m.global {
+		toAdd, toDelete = m.recomputeNeedForFile(gf, toAdd, toDelete)
+	}
+
+	m.gmut.RUnlock()
+
+	for _, ao := range toAdd {
+		m.fq.Add(ao.n, ao.remote, ao.fm)
+	}
+	for _, gf := range toDelete {
+		m.dq <- gf
+	}
+}
+
+func (m *Model) recomputeNeedForFiles(files []File) {
+	var toDelete []File
+	var toAdd []addOrder
+
+	m.gmut.RLock()
+
+	for _, gf := range files {
+		toAdd, toDelete = m.recomputeNeedForFile(gf, toAdd, toDelete)
+	}
+
+	m.gmut.RUnlock()
+
+	for _, ao := range toAdd {
+		m.fq.Add(ao.n, ao.remote, ao.fm)
+	}
+	for _, gf := range toDelete {
+		m.dq <- gf
+	}
+}
+
+func (m *Model) recomputeNeedForFile(gf File, toAdd []addOrder, toDelete []File) ([]addOrder, []File) {
+	m.lmut.RLock()
+	lf, ok := m.local[gf.Name]
+	m.lmut.RUnlock()
+
+	if !ok || gf.NewerThan(lf) {
+		if gf.Flags&protocol.FlagInvalid != 0 {
+			// Never attempt to sync invalid files
+			return toAdd, toDelete
+		}
+		if gf.Flags&protocol.FlagDeleted != 0 && !m.delete {
+			// Don't want to delete files, so forget this need
+			return toAdd, toDelete
+		}
+		if gf.Flags&protocol.FlagDeleted != 0 && !ok {
+			// Don't have the file, so don't need to delete it
+			return toAdd, toDelete
+		}
+		if m.trace["need"] {
+			log.Printf("NEED: lf:%v gf:%v", lf, gf)
+		}
+
+		if gf.Flags&protocol.FlagDeleted != 0 {
+			toDelete = append(toDelete, gf)
+		} else {
+			local, remote := BlockDiff(lf.Blocks, gf.Blocks)
+			fm := fileMonitor{
+				name:        gf.Name,
+				path:        path.Clean(path.Join(m.dir, gf.Name)),
+				global:      gf,
+				model:       m,
+				localBlocks: local,
+			}
+			toAdd = append(toAdd, addOrder{gf.Name, remote, &fm})
+		}
+	}
+
+	return toAdd, toDelete
+}
+
+func (m *Model) WhoHas(name string) []string {
+	var remote []string
+
+	m.gmut.RLock()
+	m.rmut.RLock()
+
+	gf := m.global[name]
+	for node, files := range m.remote {
+		if file, ok := files[name]; ok && file.Equals(gf) {
+			remote = append(remote, node)
+		}
+	}
+
+	m.rmut.RUnlock()
+	m.gmut.RUnlock()
+	return remote
+}
+
+func (m *Model) deleteLoop() {
+	for file := range m.dq {
+		if m.trace["file"] {
+			log.Println("FILE: Delete", file.Name)
+		}
+		path := path.Clean(path.Join(m.dir, file.Name))
+		err := os.Remove(path)
+		if err != nil {
+			log.Printf("WARNING: %s: %v", file.Name, err)
+		}
+
+		m.updateLocal(file)
+	}
+}
+
+func fileFromFileInfo(f protocol.FileInfo) File {
+	var blocks = make([]Block, len(f.Blocks))
+	var offset int64
+	for i, b := range f.Blocks {
+		blocks[i] = Block{
+			Offset: offset,
+			Size:   b.Size,
+			Hash:   b.Hash,
+		}
+		offset += int64(b.Size)
+	}
+	return File{
+		Name:     f.Name,
+		Flags:    f.Flags,
+		Modified: f.Modified,
+		Version:  f.Version,
+		Blocks:   blocks,
+	}
+}
+
+func fileInfoFromFile(f File) protocol.FileInfo {
+	var blocks = make([]protocol.BlockInfo, len(f.Blocks))
+	for i, b := range f.Blocks {
+		blocks[i] = protocol.BlockInfo{
+			Size: b.Size,
+			Hash: b.Hash,
+		}
+	}
+	return protocol.FileInfo{
+		Name:     f.Name,
+		Flags:    f.Flags,
+		Modified: f.Modified,
+		Version:  f.Version,
+		Blocks:   blocks,
+	}
+}

model/model_test.go

@@ -0,0 +1,537 @@
+package model
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+	"reflect"
+	"testing"
+	"time"
+
+	"github.com/calmh/syncthing/protocol"
+)
+
+func TestNewModel(t *testing.T) {
+	m := NewModel("foo", 1e6)
+
+	if m == nil {
+		t.Fatalf("NewModel returned nil")
+	}
+
+	if fs, _ := m.NeedFiles(); len(fs) > 0 {
+		t.Errorf("New model should have no Need")
+	}
+
+	if len(m.local) > 0 {
+		t.Errorf("New model should have no Have")
+	}
+}
+
+var testDataExpected = map[string]File{
+	"foo": File{
+		Name:     "foo",
+		Flags:    0,
+		Modified: 0,
+		Blocks:   []Block{{Offset: 0x0, Size: 0x7, Hash: []uint8{0xae, 0xc0, 0x70, 0x64, 0x5f, 0xe5, 0x3e, 0xe3, 0xb3, 0x76, 0x30, 0x59, 0x37, 0x61, 0x34, 0xf0, 0x58, 0xcc, 0x33, 0x72, 0x47, 0xc9, 0x78, 0xad, 0xd1, 0x78, 0xb6, 0xcc, 0xdf, 0xb0, 0x1, 0x9f}}},
+	},
+	"empty": File{
+		Name:     "empty",
+		Flags:    0,
+		Modified: 0,
+		Blocks:   []Block{{Offset: 0x0, Size: 0x0, Hash: []uint8{0xe3, 0xb0, 0xc4, 0x42, 0x98, 0xfc, 0x1c, 0x14, 0x9a, 0xfb, 0xf4, 0xc8, 0x99, 0x6f, 0xb9, 0x24, 0x27, 0xae, 0x41, 0xe4, 0x64, 0x9b, 0x93, 0x4c, 0xa4, 0x95, 0x99, 0x1b, 0x78, 0x52, 0xb8, 0x55}}},
+	},
+	"bar": File{
+		Name:     "bar",
+		Flags:    0,
+		Modified: 0,
+		Blocks:   []Block{{Offset: 0x0, Size: 0xa, Hash: []uint8{0x2f, 0x72, 0xcc, 0x11, 0xa6, 0xfc, 0xd0, 0x27, 0x1e, 0xce, 0xf8, 0xc6, 0x10, 0x56, 0xee, 0x1e, 0xb1, 0x24, 0x3b, 0xe3, 0x80, 0x5b, 0xf9, 0xa9, 0xdf, 0x98, 0xf9, 0x2f, 0x76, 0x36, 0xb0, 0x5c}}},
+	},
+}
+
+func init() {
+	// Fix expected test data to match reality
+	for n, f := range testDataExpected {
+		fi, _ := os.Stat("testdata/" + n)
+		f.Flags = uint32(fi.Mode())
+		f.Modified = fi.ModTime().Unix()
+		testDataExpected[n] = f
+	}
+}
+
+func TestUpdateLocal(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	if fs, _ := m.NeedFiles(); len(fs) > 0 {
+		t.Fatalf("Model with only local data should have no need")
+	}
+
+	if l1, l2 := len(m.local), len(testDataExpected); l1 != l2 {
+		t.Fatalf("Model len(local) incorrect, %d != %d", l1, l2)
+	}
+	if l1, l2 := len(m.global), len(testDataExpected); l1 != l2 {
+		t.Fatalf("Model len(global) incorrect, %d != %d", l1, l2)
+	}
+	for name, file := range testDataExpected {
+		if f, ok := m.local[name]; ok {
+			if !reflect.DeepEqual(f, file) {
+				t.Errorf("Incorrect local\n%v !=\n%v\nfor file %q", f, file, name)
+			}
+		} else {
+			t.Errorf("Missing file %q in local table", name)
+		}
+		if f, ok := m.global[name]; ok {
+			if !reflect.DeepEqual(f, file) {
+				t.Errorf("Incorrect global\n%v !=\n%v\nfor file %q", f, file, name)
+			}
+		} else {
+			t.Errorf("Missing file %q in global table", name)
+		}
+	}
+
+	for _, f := range fs {
+		if hf, ok := m.local[f.Name]; !ok || hf.Modified != f.Modified {
+			t.Fatalf("Incorrect local for %q", f.Name)
+		}
+		if cf, ok := m.global[f.Name]; !ok || cf.Modified != f.Modified {
+			t.Fatalf("Incorrect global for %q", f.Name)
+		}
+	}
+}
+
+func TestRemoteUpdateExisting(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	newFile := protocol.FileInfo{
+		Name:     "foo",
+		Modified: time.Now().Unix(),
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+	}
+	m.Index("42", []protocol.FileInfo{newFile})
+
+	if fs, _ := m.NeedFiles(); len(fs) != 1 {
+		t.Errorf("Model missing Need for one file (%d != 1)", len(fs))
+	}
+}
+
+func TestRemoteAddNew(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	newFile := protocol.FileInfo{
+		Name:     "a new file",
+		Modified: time.Now().Unix(),
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+	}
+	m.Index("42", []protocol.FileInfo{newFile})
+
+	if fs, _ := m.NeedFiles(); len(fs) != 1 {
+		t.Errorf("Model len(m.need) incorrect (%d != 1)", len(fs))
+	}
+}
+
+func TestRemoteUpdateOld(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	oldTimeStamp := int64(1234)
+	newFile := protocol.FileInfo{
+		Name:     "foo",
+		Modified: oldTimeStamp,
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+	}
+	m.Index("42", []protocol.FileInfo{newFile})
+
+	if fs, _ := m.NeedFiles(); len(fs) != 0 {
+		t.Errorf("Model len(need) incorrect (%d != 0)", len(fs))
+	}
+}
+
+func TestRemoteIndexUpdate(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	foo := protocol.FileInfo{
+		Name:     "foo",
+		Modified: time.Now().Unix(),
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+	}
+
+	bar := protocol.FileInfo{
+		Name:     "bar",
+		Modified: time.Now().Unix(),
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+	}
+
+	m.Index("42", []protocol.FileInfo{foo})
+
+	if fs, _ := m.NeedFiles(); fs[0].Name != "foo" {
+		t.Error("Model doesn't need 'foo'")
+	}
+
+	m.IndexUpdate("42", []protocol.FileInfo{bar})
+
+	if fs, _ := m.NeedFiles(); fs[0].Name != "foo" {
+		t.Error("Model doesn't need 'foo'")
+	}
+	if fs, _ := m.NeedFiles(); fs[1].Name != "bar" {
+		t.Error("Model doesn't need 'bar'")
+	}
+}
+
+func TestDelete(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	if l1, l2 := len(m.local), len(fs); l1 != l2 {
+		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
+	}
+	if l1, l2 := len(m.global), len(fs); l1 != l2 {
+		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
+	}
+
+	ot := time.Now().Unix()
+	newFile := File{
+		Name:     "a new file",
+		Modified: ot,
+		Blocks:   []Block{{0, 100, []byte("some hash bytes")}},
+	}
+	m.updateLocal(newFile)
+
+	if l1, l2 := len(m.local), len(fs)+1; l1 != l2 {
+		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
+	}
+	if l1, l2 := len(m.global), len(fs)+1; l1 != l2 {
+		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
+	}
+
+	// The deleted file is kept in the local and global tables and marked as deleted.
+
+	m.ReplaceLocal(fs)
+
+	if l1, l2 := len(m.local), len(fs)+1; l1 != l2 {
+		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
+	}
+	if l1, l2 := len(m.global), len(fs)+1; l1 != l2 {
+		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
+	}
+
+	if m.local["a new file"].Flags&(1<<12) == 0 {
+		t.Error("Unexpected deleted flag = 0 in local table")
+	}
+	if len(m.local["a new file"].Blocks) != 0 {
+		t.Error("Unexpected non-zero blocks for deleted file in local")
+	}
+	if ft := m.local["a new file"].Modified; ft != ot {
+		t.Errorf("Unexpected time %d != %d for deleted file in local", ft, ot+1)
+	}
+	if fv := m.local["a new file"].Version; fv != 1 {
+		t.Errorf("Unexpected version %d != 1 for deleted file in local", fv)
+	}
+
+	if m.global["a new file"].Flags&(1<<12) == 0 {
+		t.Error("Unexpected deleted flag = 0 in global table")
+	}
+	if len(m.global["a new file"].Blocks) != 0 {
+		t.Error("Unexpected non-zero blocks for deleted file in global")
+	}
+	if ft := m.global["a new file"].Modified; ft != ot {
+		t.Errorf("Unexpected time %d != %d for deleted file in global", ft, ot+1)
+	}
+	if fv := m.local["a new file"].Version; fv != 1 {
+		t.Errorf("Unexpected version %d != 1 for deleted file in global", fv)
+	}
+
+	// Another update should change nothing
+
+	m.ReplaceLocal(fs)
+
+	if l1, l2 := len(m.local), len(fs)+1; l1 != l2 {
+		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
+	}
+	if l1, l2 := len(m.global), len(fs)+1; l1 != l2 {
+		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
+	}
+
+	if m.local["a new file"].Flags&(1<<12) == 0 {
+		t.Error("Unexpected deleted flag = 0 in local table")
+	}
+	if len(m.local["a new file"].Blocks) != 0 {
+		t.Error("Unexpected non-zero blocks for deleted file in local")
+	}
+	if ft := m.local["a new file"].Modified; ft != ot {
+		t.Errorf("Unexpected time %d != %d for deleted file in local", ft, ot)
+	}
+	if fv := m.local["a new file"].Version; fv != 1 {
+		t.Errorf("Unexpected version %d != 1 for deleted file in local", fv)
+	}
+
+	if m.global["a new file"].Flags&(1<<12) == 0 {
+		t.Error("Unexpected deleted flag = 0 in global table")
+	}
+	if len(m.global["a new file"].Blocks) != 0 {
+		t.Error("Unexpected non-zero blocks for deleted file in global")
+	}
+	if ft := m.global["a new file"].Modified; ft != ot {
+		t.Errorf("Unexpected time %d != %d for deleted file in global", ft, ot)
+	}
+	if fv := m.local["a new file"].Version; fv != 1 {
+		t.Errorf("Unexpected version %d != 1 for deleted file in global", fv)
+	}
+}
+
+func TestForgetNode(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	if l1, l2 := len(m.local), len(fs); l1 != l2 {
+		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
+	}
+	if l1, l2 := len(m.global), len(fs); l1 != l2 {
+		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
+	}
+	if fs, _ := m.NeedFiles(); len(fs) != 0 {
+		t.Errorf("Model len(need) incorrect (%d != 0)", len(fs))
+	}
+
+	newFile := protocol.FileInfo{
+		Name:     "new file",
+		Modified: time.Now().Unix(),
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+	}
+	m.Index("42", []protocol.FileInfo{newFile})
+
+	newFile = protocol.FileInfo{
+		Name:     "new file 2",
+		Modified: time.Now().Unix(),
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+	}
+	m.Index("43", []protocol.FileInfo{newFile})
+
+	if l1, l2 := len(m.local), len(fs); l1 != l2 {
+		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
+	}
+	if l1, l2 := len(m.global), len(fs)+2; l1 != l2 {
+		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
+	}
+	if fs, _ := m.NeedFiles(); len(fs) != 2 {
+		t.Errorf("Model len(need) incorrect (%d != 2)", len(fs))
+	}
+
+	m.Close("42", nil)
+
+	if l1, l2 := len(m.local), len(fs); l1 != l2 {
+		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
+	}
+	if l1, l2 := len(m.global), len(fs)+1; l1 != l2 {
+		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
+	}
+
+	if fs, _ := m.NeedFiles(); len(fs) != 1 {
+		t.Errorf("Model len(need) incorrect (%d != 1)", len(fs))
+	}
+}
+
+func TestRequest(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	bs, err := m.Request("some node", "foo", 0, 6, nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if bytes.Compare(bs, []byte("foobar")) != 0 {
+		t.Errorf("Incorrect data from request: %q", string(bs))
+	}
+
+	bs, err = m.Request("some node", "../walk.go", 0, 6, nil)
+	if err == nil {
+		t.Error("Unexpected nil error on insecure file read")
+	}
+	if bs != nil {
+		t.Errorf("Unexpected non nil data on insecure file read: %q", string(bs))
+	}
+}
+
+func TestIgnoreWithUnknownFlags(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	valid := protocol.FileInfo{
+		Name:     "valid",
+		Modified: time.Now().Unix(),
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+		Flags:    protocol.FlagDeleted | 0755,
+	}
+
+	invalid := protocol.FileInfo{
+		Name:     "invalid",
+		Modified: time.Now().Unix(),
+		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+		Flags:    1<<27 | protocol.FlagDeleted | 0755,
+	}
+
+	m.Index("42", []protocol.FileInfo{valid, invalid})
+
+	if _, ok := m.global[valid.Name]; !ok {
+		t.Error("Model should include", valid)
+	}
+	if _, ok := m.global[invalid.Name]; ok {
+		t.Error("Model not should include", invalid)
+	}
+}
+
+func genFiles(n int) []protocol.FileInfo {
+	files := make([]protocol.FileInfo, n)
+	t := time.Now().Unix()
+	for i := 0; i < n; i++ {
+		files[i] = protocol.FileInfo{
+			Name:     fmt.Sprintf("file%d", i),
+			Modified: t,
+			Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+		}
+	}
+
+	return files
+}
+
+func BenchmarkIndex10000(b *testing.B) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+	files := genFiles(10000)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.Index("42", files)
+	}
+}
+
+func BenchmarkIndex00100(b *testing.B) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+	files := genFiles(100)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.Index("42", files)
+	}
+}
+
+func BenchmarkIndexUpdate10000f10000(b *testing.B) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+	files := genFiles(10000)
+	m.Index("42", files)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.IndexUpdate("42", files)
+	}
+}
+
+func BenchmarkIndexUpdate10000f00100(b *testing.B) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+	files := genFiles(10000)
+	m.Index("42", files)
+
+	ufiles := genFiles(100)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.IndexUpdate("42", ufiles)
+	}
+}
+
+func BenchmarkIndexUpdate10000f00001(b *testing.B) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+	files := genFiles(10000)
+	m.Index("42", files)
+
+	ufiles := genFiles(1)
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.IndexUpdate("42", ufiles)
+	}
+}
+
+type FakeConnection struct {
+	id          string
+	requestData []byte
+}
+
+func (FakeConnection) Close() error {
+	return nil
+}
+
+func (f FakeConnection) ID() string {
+	return string(f.id)
+}
+
+func (f FakeConnection) Option(string) string {
+	return ""
+}
+
+func (FakeConnection) Index([]protocol.FileInfo) {}
+
+func (f FakeConnection) Request(name string, offset int64, size uint32, hash []byte) ([]byte, error) {
+	return f.requestData, nil
+}
+
+func (FakeConnection) Ping() bool {
+	return true
+}
+
+func (FakeConnection) Statistics() protocol.Statistics {
+	return protocol.Statistics{}
+}
+
+func BenchmarkRequest(b *testing.B) {
+	m := NewModel("testdata", 1e6)
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	const n = 1000
+	files := make([]protocol.FileInfo, n)
+	t := time.Now().Unix()
+	for i := 0; i < n; i++ {
+		files[i] = protocol.FileInfo{
+			Name:     fmt.Sprintf("file%d", i),
+			Modified: t,
+			Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
+		}
+	}
+
+	fc := FakeConnection{
+		id:          "42",
+		requestData: []byte("some data to return"),
+	}
+	m.AddConnection(fc, fc)
+	m.Index("42", files)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		data, err := m.requestGlobal("42", files[i%n].Name, 0, 32, nil)
+		if err != nil {
+			b.Error(err)
+		}
+		if data == nil {
+			b.Error("nil data")
+		}
+	}
+}

model/suppressor.go

@@ -0,0 +1,72 @@
+package model
+
+import (
+	"sync"
+	"time"
+)
+
+const (
+	MAX_CHANGE_HISTORY = 4
+)
+
+type change struct {
+	size int64
+	when time.Time
+}
+
+type changeHistory struct {
+	changes []change
+	next    int64
+	prevSup bool
+}
+
+type suppressor struct {
+	sync.Mutex
+	changes   map[string]changeHistory
+	threshold int64 // bytes/s
+}
+
+func (h changeHistory) bandwidth(t time.Time) int64 {
+	if len(h.changes) == 0 {
+		return 0
+	}
+
+	var t0 = h.changes[0].when
+	if t == t0 {
+		return 0
+	}
+
+	var bw float64
+	for _, c := range h.changes {
+		bw += float64(c.size)
+	}
+	return int64(bw / t.Sub(t0).Seconds())
+}
+
+func (h *changeHistory) append(size int64, t time.Time) {
+	c := change{size, t}
+	if len(h.changes) == MAX_CHANGE_HISTORY {
+		h.changes = h.changes[1:MAX_CHANGE_HISTORY]
+	}
+	h.changes = append(h.changes, c)
+}
+
+func (s *suppressor) suppress(name string, size int64, t time.Time) (bool, bool) {
+	s.Lock()
+
+	if s.changes == nil {
+		s.changes = make(map[string]changeHistory)
+	}
+	h := s.changes[name]
+	sup := h.bandwidth(t) > s.threshold
+	prevSup := h.prevSup
+	h.prevSup = sup
+	if !sup {
+		h.append(size, t)
+	}
+	s.changes[name] = h
+
+	s.Unlock()
+
+	return sup, prevSup
+}

model/suppressor_test.go

@@ -0,0 +1,113 @@
+package model
+
+import (
+	"testing"
+	"time"
+)
+
+func TestSuppressor(t *testing.T) {
+	s := suppressor{threshold: 10000}
+	t0 := time.Now()
+
+	t1 := t0
+	sup, prev := s.suppress("foo", 10000, t1)
+	if sup {
+		t.Fatal("Never suppress first change")
+	}
+	if prev {
+		t.Fatal("Incorrect prev status")
+	}
+
+	// bw is 10000 / 10 = 1000
+	t1 = t0.Add(10 * time.Second)
+	if bw := s.changes["foo"].bandwidth(t1); bw != 1000 {
+		t.Error("Incorrect bw %d", bw)
+	}
+	sup, prev = s.suppress("foo", 10000, t1)
+	if sup {
+		t.Fatal("Should still be fine")
+	}
+	if prev {
+		t.Fatal("Incorrect prev status")
+	}
+
+	// bw is (10000 + 10000) / 11 = 1818
+	t1 = t0.Add(11 * time.Second)
+	if bw := s.changes["foo"].bandwidth(t1); bw != 1818 {
+		t.Error("Incorrect bw %d", bw)
+	}
+	sup, prev = s.suppress("foo", 100500, t1)
+	if sup {
+		t.Fatal("Should still be fine")
+	}
+	if prev {
+		t.Fatal("Incorrect prev status")
+	}
+
+	// bw is (10000 + 10000 + 100500) / 12 = 10041
+	t1 = t0.Add(12 * time.Second)
+	if bw := s.changes["foo"].bandwidth(t1); bw != 10041 {
+		t.Error("Incorrect bw %d", bw)
+	}
+	sup, prev = s.suppress("foo", 10000000, t1) // value will be ignored
+	if !sup {
+		t.Fatal("Should be over threshold")
+	}
+	if prev {
+		t.Fatal("Incorrect prev status")
+	}
+
+	// bw is (10000 + 10000 + 100500) / 15 = 8033
+	t1 = t0.Add(15 * time.Second)
+	if bw := s.changes["foo"].bandwidth(t1); bw != 8033 {
+		t.Error("Incorrect bw %d", bw)
+	}
+	sup, prev = s.suppress("foo", 10000000, t1)
+	if sup {
+		t.Fatal("Should be Ok")
+	}
+	if !prev {
+		t.Fatal("Incorrect prev status")
+	}
+}
+
+func TestHistory(t *testing.T) {
+	h := changeHistory{}
+
+	t0 := time.Now()
+	h.append(40, t0)
+
+	if l := len(h.changes); l != 1 {
+		t.Errorf("Incorrect history length %d", l)
+	}
+	if s := h.changes[0].size; s != 40 {
+		t.Errorf("Incorrect first record size %d", s)
+	}
+
+	for i := 1; i < MAX_CHANGE_HISTORY; i++ {
+		h.append(int64(40+i), t0.Add(time.Duration(i)*time.Second))
+	}
+
+	if l := len(h.changes); l != MAX_CHANGE_HISTORY {
+		t.Errorf("Incorrect history length %d", l)
+	}
+	if s := h.changes[0].size; s != 40 {
+		t.Errorf("Incorrect first record size %d", s)
+	}
+	if s := h.changes[MAX_CHANGE_HISTORY-1].size; s != 40+MAX_CHANGE_HISTORY-1 {
+		t.Errorf("Incorrect last record size %d", s)
+	}
+
+	h.append(999, t0.Add(time.Duration(999)*time.Second))
+
+	if l := len(h.changes); l != MAX_CHANGE_HISTORY {
+		t.Errorf("Incorrect history length %d", l)
+	}
+	if s := h.changes[0].size; s != 41 {
+		t.Errorf("Incorrect first record size %d", s)
+	}
+	if s := h.changes[MAX_CHANGE_HISTORY-1].size; s != 999 {
+		t.Errorf("Incorrect last record size %d", s)
+	}
+
+}

model/testdata/.stignore

@@ -0,0 +1,2 @@
+.*
+quux

model/walk.go

@@ -0,0 +1,243 @@
+package model
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/calmh/syncthing/protocol"
+)
+
+const BlockSize = 128 * 1024
+
+type File struct {
+	Name     string
+	Flags    uint32
+	Modified int64
+	Version  uint32
+	Blocks   []Block
+}
+
+func (f File) Size() (bytes int) {
+	for _, b := range f.Blocks {
+		bytes += int(b.Size)
+	}
+	return
+}
+
+func (f File) String() string {
+	return fmt.Sprintf("File{Name:%q, Flags:0x%x, Modified:%d, Version:%d, NumBlocks:%d}",
+		f.Name, f.Flags, f.Modified, f.Version, len(f.Blocks))
+}
+
+func (f File) Equals(o File) bool {
+	return f.Modified == o.Modified && f.Version == o.Version
+}
+
+func (f File) NewerThan(o File) bool {
+	return f.Modified > o.Modified || (f.Modified == o.Modified && f.Version > o.Version)
+}
+
+func isTempName(name string) bool {
+	return strings.HasPrefix(path.Base(name), ".syncthing.")
+}
+
+func tempName(name string, modified int64) string {
+	tdir := path.Dir(name)
+	tname := fmt.Sprintf(".syncthing.%s.%d", path.Base(name), modified)
+	return path.Join(tdir, tname)
+}
+
+func (m *Model) loadIgnoreFiles(ign map[string][]string) filepath.WalkFunc {
+	return func(p string, info os.FileInfo, err error) error {
+		if err != nil {
+			return nil
+		}
+
+		rn, err := filepath.Rel(m.dir, p)
+		if err != nil {
+			return nil
+		}
+
+		if pn, sn := path.Split(rn); sn == ".stignore" {
+			pn := strings.Trim(pn, "/")
+			bs, _ := ioutil.ReadFile(p)
+			lines := bytes.Split(bs, []byte("\n"))
+			var patterns []string
+			for _, line := range lines {
+				if len(line) > 0 {
+					patterns = append(patterns, string(line))
+				}
+			}
+			ign[pn] = patterns
+		}
+
+		return nil
+	}
+}
+
+func (m *Model) walkAndHashFiles(res *[]File, ign map[string][]string) filepath.WalkFunc {
+	return func(p string, info os.FileInfo, err error) error {
+		if err != nil {
+			if m.trace["file"] {
+				log.Printf("FILE: %q: %v", p, err)
+			}
+			return nil
+		}
+
+		if isTempName(p) {
+			return nil
+		}
+
+		rn, err := filepath.Rel(m.dir, p)
+		if err != nil {
+			return nil
+		}
+
+		if _, sn := path.Split(rn); sn == ".stignore" {
+			// We never sync the .stignore files
+			return nil
+		}
+
+		if ignoreFile(ign, rn) {
+			if m.trace["file"] {
+				log.Println("FILE: IGNORE:", rn)
+			}
+			return nil
+		}
+
+		if info.Mode()&os.ModeType == 0 {
+			modified := info.ModTime().Unix()
+
+			m.lmut.RLock()
+			lf, ok := m.local[rn]
+			m.lmut.RUnlock()
+
+			if ok && lf.Modified == modified {
+				if nf := uint32(info.Mode()); nf != lf.Flags {
+					lf.Flags = nf
+					lf.Version++
+				}
+				*res = append(*res, lf)
+			} else {
+				if cur, prev := m.sup.suppress(rn, info.Size(), time.Now()); cur {
+					if m.trace["file"] {
+						log.Printf("FILE: SUPPRESS: %q change bw over threshold", rn)
+					}
+					if !prev {
+						log.Printf("INFO: Changes to %q are being temporarily suppressed because it changes too frequently.", rn)
+					}
+
+					if ok {
+						lf.Flags = protocol.FlagInvalid
+						lf.Version++
+						*res = append(*res, lf)
+					}
+					return nil
+				} else if prev && !cur {
+					log.Printf("INFO: Changes to %q are no longer suppressed.", rn)
+				}
+
+				if m.trace["file"] {
+					log.Printf("FILE: Hash %q", p)
+				}
+				fd, err := os.Open(p)
+				if err != nil {
+					if m.trace["file"] {
+						log.Printf("FILE: %q: %v", p, err)
+					}
+					return nil
+				}
+				defer fd.Close()
+
+				blocks, err := Blocks(fd, BlockSize)
+				if err != nil {
+					if m.trace["file"] {
+						log.Printf("FILE: %q: %v", p, err)
+					}
+					return nil
+				}
+				f := File{
+					Name:     rn,
+					Flags:    uint32(info.Mode()),
+					Modified: modified,
+					Blocks:   blocks,
+				}
+				*res = append(*res, f)
+			}
+		}
+
+		return nil
+	}
+}
+
+// Walk returns the list of files found in the local repository by scanning the
+// file system. Files are blockwise hashed.
+func (m *Model) Walk(followSymlinks bool) (files []File, ignore map[string][]string) {
+	ignore = make(map[string][]string)
+
+	hashFiles := m.walkAndHashFiles(&files, ignore)
+
+	filepath.Walk(m.dir, m.loadIgnoreFiles(ignore))
+	filepath.Walk(m.dir, hashFiles)
+
+	if followSymlinks {
+		d, err := os.Open(m.dir)
+		if err != nil {
+			return
+		}
+		defer d.Close()
+
+		fis, err := d.Readdir(-1)
+		if err != nil {
+			return
+		}
+
+		for _, info := range fis {
+			if info.Mode()&os.ModeSymlink != 0 {
+				dir := path.Join(m.dir, info.Name()) + "/"
+				filepath.Walk(dir, m.loadIgnoreFiles(ignore))
+				filepath.Walk(dir, hashFiles)
+			}
+		}
+	}
+
+	return
+}
+
+func (m *Model) cleanTempFile(path string, info os.FileInfo, err error) error {
+	if err != nil {
+		return err
+	}
+	if info.Mode()&os.ModeType == 0 && isTempName(path) {
+		if m.trace["file"] {
+			log.Printf("FILE: Remove %q", path)
+		}
+		os.Remove(path)
+	}
+	return nil
+}
+
+func (m *Model) cleanTempFiles() {
+	filepath.Walk(m.dir, m.cleanTempFile)
+}
+
+func ignoreFile(patterns map[string][]string, file string) bool {
+	first, last := path.Split(file)
+	for prefix, pats := range patterns {
+		if len(prefix) == 0 || prefix == first || strings.HasPrefix(first, prefix+"/") {
+			for _, pattern := range pats {
+				if match, _ := path.Match(pattern, last); match {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}

model/walk_test.go

@@ -0,0 +1,83 @@
+package model
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+	"time"
+)
+
+var testdata = []struct {
+	name string
+	size int
+	hash string
+}{
+	{"bar", 10, "2f72cc11a6fcd0271ecef8c61056ee1eb1243be3805bf9a9df98f92f7636b05c"},
+	{"empty", 0, "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"},
+	{"foo", 7, "aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f"},
+}
+
+var correctIgnores = map[string][]string{
+	"": {".*", "quux"},
+}
+
+func TestWalk(t *testing.T) {
+	m := NewModel("testdata", 1e6)
+	files, ignores := m.Walk(false)
+
+	if l1, l2 := len(files), len(testdata); l1 != l2 {
+		t.Fatalf("Incorrect number of walked files %d != %d", l1, l2)
+	}
+
+	for i := range testdata {
+		if n1, n2 := testdata[i].name, files[i].Name; n1 != n2 {
+			t.Errorf("Incorrect file name %q != %q for case #%d", n1, n2, i)
+		}
+
+		if h1, h2 := fmt.Sprintf("%x", files[i].Blocks[0].Hash), testdata[i].hash; h1 != h2 {
+			t.Errorf("Incorrect hash %q != %q for case #%d", h1, h2, i)
+		}
+
+		t0 := time.Date(2010, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
+		t1 := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
+		if mt := files[i].Modified; mt < t0 || mt > t1 {
+			t.Errorf("Unrealistic modtime %d for test %d", mt, i)
+		}
+	}
+
+	if !reflect.DeepEqual(ignores, correctIgnores) {
+		t.Errorf("Incorrect ignores\n  %v\n  %v", correctIgnores, ignores)
+	}
+}
+
+func TestIgnore(t *testing.T) {
+	var patterns = map[string][]string{
+		"":        {"t2"},
+		"foo":     {"bar", "z*"},
+		"foo/baz": {"quux", ".*"},
+	}
+	var tests = []struct {
+		f string
+		r bool
+	}{
+		{"foo/bar", true},
+		{"foo/quux", false},
+		{"foo/zuux", true},
+		{"foo/qzuux", false},
+		{"foo/baz/t1", false},
+		{"foo/baz/t2", true},
+		{"foo/baz/bar", true},
+		{"foo/baz/quuxa", false},
+		{"foo/baz/aquux", false},
+		{"foo/baz/.quux", true},
+		{"foo/baz/zquux", true},
+		{"foo/baz/quux", true},
+		{"foo/bazz/quux", false},
+	}
+
+	for i, tc := range tests {
+		if r := ignoreFile(patterns, tc.f); r != tc.r {
+			t.Errorf("Incorrect ignoreFile() #%d; E: %v, A: %v", i, tc.r, r)
+		}
+	}
+}

model_puller.go

@@ -1,248 +0,0 @@
-package main
-
-/*
-
-Locking
-=======
-
-These methods are never called from the outside so don't follow the locking
-policy in model.go.
-
-TODO(jb): Refactor this into smaller and cleaner pieces.
-TODO(jb): Increase performance by taking apparent peer bandwidth into account.
-
-*/
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"os"
-	"path"
-	"sync"
-	"time"
-
-	"github.com/calmh/syncthing/buffers"
-)
-
-func (m *Model) pullFile(name string) error {
-	m.RLock()
-	var localFile = m.local[name]
-	var globalFile = m.global[name]
-	var nodeIDs = m.whoHas(name)
-	m.RUnlock()
-
-	if len(nodeIDs) == 0 {
-		return fmt.Errorf("%s: no connected nodes with file available", name)
-	}
-
-	filename := path.Join(m.dir, name)
-	sdir := path.Dir(filename)
-
-	_, err := os.Stat(sdir)
-	if err != nil && os.IsNotExist(err) {
-		os.MkdirAll(sdir, 0777)
-	}
-
-	tmpFilename := tempName(filename, globalFile.Modified)
-	tmpFile, err := os.Create(tmpFilename)
-	if err != nil {
-		return err
-	}
-
-	contentChan := make(chan content, 32)
-	var applyDone sync.WaitGroup
-	applyDone.Add(1)
-	go func() {
-		applyContent(contentChan, tmpFile)
-		tmpFile.Close()
-		applyDone.Done()
-	}()
-
-	local, remote := localFile.Blocks.To(globalFile.Blocks)
-	var fetchDone sync.WaitGroup
-
-	// One local copy routine
-
-	fetchDone.Add(1)
-	go func() {
-		for _, block := range local {
-			data, err := m.Request("<local>", name, block.Offset, block.Length, block.Hash)
-			if err != nil {
-				break
-			}
-			contentChan <- content{
-				offset: int64(block.Offset),
-				data:   data,
-			}
-		}
-		fetchDone.Done()
-	}()
-
-	// N remote copy routines
-
-	var remoteBlocks = blockIterator{blocks: remote}
-	for i := 0; i < opts.Advanced.RequestsInFlight; i++ {
-		curNode := nodeIDs[i%len(nodeIDs)]
-		fetchDone.Add(1)
-
-		go func(nodeID string) {
-			for {
-				block, ok := remoteBlocks.Next()
-				if !ok {
-					break
-				}
-				data, err := m.RequestGlobal(nodeID, name, block.Offset, block.Length, block.Hash)
-				if err != nil {
-					break
-				}
-				contentChan <- content{
-					offset: int64(block.Offset),
-					data:   data,
-				}
-			}
-			fetchDone.Done()
-		}(curNode)
-	}
-
-	fetchDone.Wait()
-	close(contentChan)
-	applyDone.Wait()
-
-	err = hashCheck(tmpFilename, globalFile.Blocks)
-	if err != nil {
-		return fmt.Errorf("%s: %s (deleting)", path.Base(name), err.Error())
-	}
-
-	err = os.Chtimes(tmpFilename, time.Unix(globalFile.Modified, 0), time.Unix(globalFile.Modified, 0))
-	if err != nil {
-		return err
-	}
-
-	err = os.Rename(tmpFilename, filename)
-	if err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func (m *Model) puller() {
-	for {
-		time.Sleep(time.Second)
-
-		var ns []string
-		m.RLock()
-		for n := range m.need {
-			ns = append(ns, n)
-		}
-		m.RUnlock()
-
-		if len(ns) == 0 {
-			continue
-		}
-
-		var limiter = make(chan bool, opts.Advanced.FilesInFlight)
-		var allDone sync.WaitGroup
-
-		for _, n := range ns {
-			limiter <- true
-			allDone.Add(1)
-
-			go func(n string) {
-				defer func() {
-					allDone.Done()
-					<-limiter
-				}()
-
-				f, ok := m.GlobalFile(n)
-				if !ok {
-					return
-				}
-
-				var err error
-				if f.Flags&FlagDeleted == 0 {
-					if opts.Debug.TraceFile {
-						debugf("FILE: Pull %q", n)
-					}
-					err = m.pullFile(n)
-				} else {
-					if opts.Debug.TraceFile {
-						debugf("FILE: Remove %q", n)
-					}
-					// Cheerfully ignore errors here
-					_ = os.Remove(path.Join(m.dir, n))
-				}
-				if err == nil {
-					m.UpdateLocal(f)
-				} else {
-					warnln(err)
-				}
-			}(n)
-		}
-
-		allDone.Wait()
-	}
-}
-
-type content struct {
-	offset int64
-	data   []byte
-}
-
-func applyContent(cc <-chan content, dst io.WriterAt) error {
-	var err error
-
-	for c := range cc {
-		_, err = dst.WriteAt(c.data, c.offset)
-		buffers.Put(c.data)
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func hashCheck(name string, correct []Block) error {
-	rf, err := os.Open(name)
-	if err != nil {
-		return err
-	}
-	defer rf.Close()
-
-	current, err := Blocks(rf, BlockSize)
-	if err != nil {
-		return err
-	}
-	if len(current) != len(correct) {
-		return errors.New("incorrect number of blocks")
-	}
-	for i := range current {
-		if bytes.Compare(current[i].Hash, correct[i].Hash) != 0 {
-			return fmt.Errorf("hash mismatch: %x != %x", current[i], correct[i])
-		}
-	}
-
-	return nil
-}
-
-type blockIterator struct {
-	sync.Mutex
-	blocks []Block
-}
-
-func (i *blockIterator) Next() (b Block, ok bool) {
-	i.Lock()
-	defer i.Unlock()
-
-	if len(i.blocks) == 0 {
-		return
-	}
-
-	b, i.blocks = i.blocks[0], i.blocks[1:]
-	ok = true
-
-	return
-}

model_test.go

@@ -1,308 +0,0 @@
-package main
-
-import (
-	"reflect"
-	"testing"
-	"time"
-
-	"github.com/calmh/syncthing/protocol"
-)
-
-func TestNewModel(t *testing.T) {
-	m := NewModel("foo")
-
-	if m == nil {
-		t.Fatalf("NewModel returned nil")
-	}
-
-	if len(m.need) > 0 {
-		t.Errorf("New model should have no Need")
-	}
-
-	if len(m.local) > 0 {
-		t.Errorf("New model should have no Have")
-	}
-}
-
-var testDataExpected = map[string]File{
-	"foo": File{
-		Name:     "foo",
-		Flags:    0644,
-		Modified: 1384244572,
-		Blocks:   []Block{{Offset: 0x0, Length: 0x7, Hash: []uint8{0xae, 0xc0, 0x70, 0x64, 0x5f, 0xe5, 0x3e, 0xe3, 0xb3, 0x76, 0x30, 0x59, 0x37, 0x61, 0x34, 0xf0, 0x58, 0xcc, 0x33, 0x72, 0x47, 0xc9, 0x78, 0xad, 0xd1, 0x78, 0xb6, 0xcc, 0xdf, 0xb0, 0x1, 0x9f}}},
-	},
-	"bar": File{
-		Name:     "bar",
-		Flags:    0644,
-		Modified: 1384244579,
-		Blocks:   []Block{{Offset: 0x0, Length: 0xa, Hash: []uint8{0x2f, 0x72, 0xcc, 0x11, 0xa6, 0xfc, 0xd0, 0x27, 0x1e, 0xce, 0xf8, 0xc6, 0x10, 0x56, 0xee, 0x1e, 0xb1, 0x24, 0x3b, 0xe3, 0x80, 0x5b, 0xf9, 0xa9, 0xdf, 0x98, 0xf9, 0x2f, 0x76, 0x36, 0xb0, 0x5c}}},
-	},
-	"baz/quux": File{
-		Name:     "baz/quux",
-		Flags:    0644,
-		Modified: 1384244676,
-		Blocks:   []Block{{Offset: 0x0, Length: 0x9, Hash: []uint8{0xc1, 0x54, 0xd9, 0x4e, 0x94, 0xba, 0x72, 0x98, 0xa6, 0xad, 0xb0, 0x52, 0x3a, 0xfe, 0x34, 0xd1, 0xb6, 0xa5, 0x81, 0xd6, 0xb8, 0x93, 0xa7, 0x63, 0xd4, 0x5d, 0xdc, 0x5e, 0x20, 0x9d, 0xcb, 0x83}}},
-	},
-}
-
-func TestUpdateLocal(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
-	m.ReplaceLocal(fs)
-
-	if len(m.need) > 0 {
-		t.Fatalf("Model with only local data should have no need")
-	}
-
-	if l1, l2 := len(m.local), len(testDataExpected); l1 != l2 {
-		t.Fatalf("Model len(local) incorrect, %d != %d", l1, l2)
-	}
-	if l1, l2 := len(m.global), len(testDataExpected); l1 != l2 {
-		t.Fatalf("Model len(global) incorrect, %d != %d", l1, l2)
-	}
-	for name, file := range testDataExpected {
-		if f, ok := m.local[name]; ok {
-			if !reflect.DeepEqual(f, file) {
-				t.Errorf("Incorrect local\n%v !=\n%v\nfor file %q", f, file, name)
-			}
-		} else {
-			t.Errorf("Missing file %q in local table", name)
-		}
-		if f, ok := m.global[name]; ok {
-			if !reflect.DeepEqual(f, file) {
-				t.Errorf("Incorrect global\n%v !=\n%v\nfor file %q", f, file, name)
-			}
-		} else {
-			t.Errorf("Missing file %q in global table", name)
-		}
-	}
-
-	for _, f := range fs {
-		if hf, ok := m.local[f.Name]; !ok || hf.Modified != f.Modified {
-			t.Fatalf("Incorrect local for %q", f.Name)
-		}
-		if cf, ok := m.global[f.Name]; !ok || cf.Modified != f.Modified {
-			t.Fatalf("Incorrect global for %q", f.Name)
-		}
-	}
-}
-
-func TestRemoteUpdateExisting(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
-	m.ReplaceLocal(fs)
-
-	newFile := protocol.FileInfo{
-		Name:     "foo",
-		Modified: time.Now().Unix(),
-		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
-	}
-	m.Index("42", []protocol.FileInfo{newFile})
-
-	if l := len(m.need); l != 1 {
-		t.Errorf("Model missing Need for one file (%d != 1)", l)
-	}
-}
-
-func TestRemoteAddNew(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
-	m.ReplaceLocal(fs)
-
-	newFile := protocol.FileInfo{
-		Name:     "a new file",
-		Modified: time.Now().Unix(),
-		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
-	}
-	m.Index("42", []protocol.FileInfo{newFile})
-
-	if l1, l2 := len(m.need), 1; l1 != l2 {
-		t.Errorf("Model len(m.need) incorrect (%d != %d)", l1, l2)
-	}
-}
-
-func TestRemoteUpdateOld(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
-	m.ReplaceLocal(fs)
-
-	oldTimeStamp := int64(1234)
-	newFile := protocol.FileInfo{
-		Name:     "foo",
-		Modified: oldTimeStamp,
-		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
-	}
-	m.Index("42", []protocol.FileInfo{newFile})
-
-	if l1, l2 := len(m.need), 0; l1 != l2 {
-		t.Errorf("Model len(need) incorrect (%d != %d)", l1, l2)
-	}
-}
-
-func TestRemoteIndexUpdate(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
-	m.ReplaceLocal(fs)
-
-	foo := protocol.FileInfo{
-		Name:     "foo",
-		Modified: time.Now().Unix(),
-		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
-	}
-
-	bar := protocol.FileInfo{
-		Name:     "bar",
-		Modified: time.Now().Unix(),
-		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
-	}
-
-	m.Index("42", []protocol.FileInfo{foo})
-
-	if _, ok := m.need["foo"]; !ok {
-		t.Error("Model doesn't need 'foo'")
-	}
-
-	m.IndexUpdate("42", []protocol.FileInfo{bar})
-
-	if _, ok := m.need["foo"]; !ok {
-		t.Error("Model doesn't need 'foo'")
-	}
-	if _, ok := m.need["bar"]; !ok {
-		t.Error("Model doesn't need 'bar'")
-	}
-}
-
-func TestDelete(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
-	m.ReplaceLocal(fs)
-
-	if l1, l2 := len(m.local), len(fs); l1 != l2 {
-		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.global), len(fs); l1 != l2 {
-		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
-	}
-
-	ot := time.Now().Unix()
-	newFile := File{
-		Name:     "a new file",
-		Modified: ot,
-		Blocks:   []Block{{0, 100, []byte("some hash bytes")}},
-	}
-	m.UpdateLocal(newFile)
-
-	if l1, l2 := len(m.local), len(fs)+1; l1 != l2 {
-		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.global), len(fs)+1; l1 != l2 {
-		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
-	}
-
-	// The deleted file is kept in the local and global tables and marked as deleted.
-
-	m.ReplaceLocal(fs)
-
-	if l1, l2 := len(m.local), len(fs)+1; l1 != l2 {
-		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.global), len(fs)+1; l1 != l2 {
-		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
-	}
-
-	if m.local["a new file"].Flags&(1<<12) == 0 {
-		t.Error("Unexpected deleted flag = 0 in local table")
-	}
-	if len(m.local["a new file"].Blocks) != 0 {
-		t.Error("Unexpected non-zero blocks for deleted file in local")
-	}
-	if ft := m.local["a new file"].Modified; ft != ot+1 {
-		t.Errorf("Unexpected time %d != %d for deleted file in local", ft, ot+1)
-	}
-
-	if m.global["a new file"].Flags&(1<<12) == 0 {
-		t.Error("Unexpected deleted flag = 0 in global table")
-	}
-	if len(m.global["a new file"].Blocks) != 0 {
-		t.Error("Unexpected non-zero blocks for deleted file in global")
-	}
-	if ft := m.local["a new file"].Modified; ft != ot+1 {
-		t.Errorf("Unexpected time %d != %d for deleted file in local", ft, ot+1)
-	}
-
-	// Another update should change nothing
-
-	m.ReplaceLocal(fs)
-
-	if l1, l2 := len(m.local), len(fs)+1; l1 != l2 {
-		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.global), len(fs)+1; l1 != l2 {
-		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
-	}
-
-	if m.local["a new file"].Flags&(1<<12) == 0 {
-		t.Error("Unexpected deleted flag = 0 in local table")
-	}
-	if len(m.local["a new file"].Blocks) != 0 {
-		t.Error("Unexpected non-zero blocks for deleted file in local")
-	}
-	if ft := m.local["a new file"].Modified; ft != ot+1 {
-		t.Errorf("Unexpected time %d != %d for deleted file in local", ft, ot+1)
-	}
-
-	if m.global["a new file"].Flags&(1<<12) == 0 {
-		t.Error("Unexpected deleted flag = 0 in global table")
-	}
-	if len(m.global["a new file"].Blocks) != 0 {
-		t.Error("Unexpected non-zero blocks for deleted file in global")
-	}
-	if ft := m.local["a new file"].Modified; ft != ot+1 {
-		t.Errorf("Unexpected time %d != %d for deleted file in local", ft, ot+1)
-	}
-}
-
-func TestForgetNode(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
-	m.ReplaceLocal(fs)
-
-	if l1, l2 := len(m.local), len(fs); l1 != l2 {
-		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.global), len(fs); l1 != l2 {
-		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.need), 0; l1 != l2 {
-		t.Errorf("Model len(need) incorrect (%d != %d)", l1, l2)
-	}
-
-	newFile := protocol.FileInfo{
-		Name:     "new file",
-		Modified: time.Now().Unix(),
-		Blocks:   []protocol.BlockInfo{{100, []byte("some hash bytes")}},
-	}
-	m.Index("42", []protocol.FileInfo{newFile})
-
-	if l1, l2 := len(m.local), len(fs); l1 != l2 {
-		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.global), len(fs)+1; l1 != l2 {
-		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.need), 1; l1 != l2 {
-		t.Errorf("Model len(need) incorrect (%d != %d)", l1, l2)
-	}
-
-	m.Close("42", nil)
-
-	if l1, l2 := len(m.local), len(fs); l1 != l2 {
-		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.global), len(fs); l1 != l2 {
-		t.Errorf("Model len(global) incorrect (%d != %d)", l1, l2)
-	}
-	if l1, l2 := len(m.need), 0; l1 != l2 {
-		t.Errorf("Model len(need) incorrect (%d != %d)", l1, l2)
-	}
-}

protocol/PROTOCOL.md

@@ -9,7 +9,7 @@ Each node has a _repository_ of files described by the _local model_,
 containing modifications times and block hashes. The local model is sent
 to the other nodes in the cluster. The union of all files in the local
 models, with files selected for most recent modification time, forms the
-_global model_. Each node strives to get it's repository in synch with
+_global model_. Each node strives to get it's repository in sync with
 the global model by requesting missing blocks from the other nodes.
 
 Transport and Authentication
@@ -62,11 +62,10 @@ reserved bits must be set to zero.
 All data following the message header is in XDR (RFC 1014) encoding.
 The actual data types in use by BEP, in XDR naming convention, are:
 
- - unsigned int   -- unsigned 32 bit integer
- - hyper          -- signed 64 bit integer
- - unsigned hyper -- signed 64 bit integer
- - opaque<>       -- variable length opaque data
- - string<>       -- variable length string
+ - (unsigned) int   -- (unsigned) 32 bit integer
+ - (unsigned) hyper -- (unsigned) 64 bit integer
+ - opaque<>         -- variable length opaque data
+ - string<>         -- variable length string
 
 The encoding of opaque<> and string<> are identical, the distinction is
 solely in interpretation. Opaque data should not be interpreted as such,
@@ -92,6 +91,7 @@ message.
         string Name<>;
         unsigned int Flags;
         hyper Modified;
+        unsigned int Version;
         BlockInfo Blocks<>;
     }
 
@@ -102,15 +102,19 @@ message.
 
 The file name is the part relative to the repository root. The
 modification time is expressed as the number of seconds since the Unix
-Epoch. The hash algorithm is implied by the hash length. Currently, the
-hash must be 32 bytes long and computed by SHA256.
+Epoch. The version field is a counter that increments each time the file
+changes but resets to zero each time the modification is updated. This
+is used to signal changes to the file (or file metadata) while the
+modification time remains unchanged. The hash algorithm is implied by
+the hash length. Currently, the hash must be 32 bytes long and computed
+by SHA256.
 
 The flags field is made up of the following single bit flags:
 
      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
-    |              Reserved               |D|   Unix Perm. & Mode   |
+    |              Reserved             |I|D|   Unix Perm. & Mode   |
     +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
  - The lower 12 bits hold the common Unix permission and mode bits.
@@ -118,9 +122,13 @@ The flags field is made up of the following single bit flags:
  - Bit 19 ("D") is set when the file has been deleted. The block list
    shall contain zero blocks and the modification time indicates the
    time of deletion or, if deletion time is not reliably determinable,
-   one second past the last know modification time.
+   the last known modification time and a higher version number.
 
- - Bit 0 through 18 are reserved for future use and shall be set to
+ - Bit 18 ("I") is set when the file is invalid and unavailable for
+   synchronization. A peer may set this bit to indicate that it can
+   temporarily not serve data for the file.
+
+ - Bit 0 through 17 are reserved for future use and shall be set to
    zero.
 
 ### Request (Type = 2)
@@ -185,6 +193,33 @@ model, the Index Update merely amends it with new or updated file
 information. Any files not mentioned in an Index Update are left
 unchanged.
 
+### Options (Type = 7)
+
+This informational message provides information about the client
+configuration, version, etc. It is sent at connection initiation and,
+optionally, when any of the sent parameters have changed. The message is
+in the form of a list of (key, value) pairs, both of string type.
+
+    struct OptionsMessage {
+        KeyValue Options<>;
+    }
+
+    struct KeyValue {
+        string Key;
+        string Value;
+    }
+
+Key ID:s apart from the well known ones are implementation
+specific. An implementation is expected to ignore unknown keys. An
+implementation may impose limits on key and value size.
+
+Well known keys:
+
+  - "clientId" -- The name of the implementation. Example: "syncthing".
+  - "clientVersion" -- The version of the client. Example: "v1.0.33-47". The
+    Following the SemVer 2.0 specification for version strings is
+    encouraged but not enforced.
+
 Example Exchange
 ----------------
 

protocol/common_test.go

@@ -5,7 +5,7 @@ import "io"
 type TestModel struct {
 	data   []byte
 	name   string
-	offset uint64
+	offset int64
 	size   uint32
 	hash   []byte
 	closed bool
@@ -17,7 +17,7 @@ func (t *TestModel) Index(nodeID string, files []FileInfo) {
 func (t *TestModel) IndexUpdate(nodeID string, files []FileInfo) {
 }
 
-func (t *TestModel) Request(nodeID, name string, offset uint64, size uint32, hash []byte) ([]byte, error) {
+func (t *TestModel) Request(nodeID, name string, offset int64, size uint32, hash []byte) ([]byte, error) {
 	t.name = name
 	t.offset = offset
 	t.size = size

protocol/messages.go

@@ -4,7 +4,7 @@ import "io"
 
 type request struct {
 	name   string
-	offset uint64
+	offset int64
 	size   uint32
 	hash   []byte
 }
@@ -39,9 +39,10 @@ func (w *marshalWriter) writeIndex(idx []FileInfo) {
 		w.writeString(f.Name)
 		w.writeUint32(f.Flags)
 		w.writeUint64(uint64(f.Modified))
+		w.writeUint32(f.Version)
 		w.writeUint32(uint32(len(f.Blocks)))
 		for _, b := range f.Blocks {
-			w.writeUint32(b.Length)
+			w.writeUint32(b.Size)
 			w.writeBytes(b.Hash)
 		}
 	}
@@ -55,7 +56,7 @@ func WriteIndex(w io.Writer, idx []FileInfo) (int, error) {
 
 func (w *marshalWriter) writeRequest(r request) {
 	w.writeString(r.name)
-	w.writeUint64(r.offset)
+	w.writeUint64(uint64(r.offset))
 	w.writeUint32(r.size)
 	w.writeBytes(r.hash)
 }
@@ -64,6 +65,14 @@ func (w *marshalWriter) writeResponse(data []byte) {
 	w.writeBytes(data)
 }
 
+func (w *marshalWriter) writeOptions(opts map[string]string) {
+	w.writeUint32(uint32(len(opts)))
+	for k, v := range opts {
+		w.writeString(k)
+		w.writeString(v)
+	}
+}
+
 func (r *marshalReader) readHeader() header {
 	return decodeHeader(r.readUint32())
 }
@@ -77,10 +86,11 @@ func (r *marshalReader) readIndex() []FileInfo {
 			files[i].Name = r.readString()
 			files[i].Flags = r.readUint32()
 			files[i].Modified = int64(r.readUint64())
+			files[i].Version = r.readUint32()
 			nblocks := r.readUint32()
 			blocks := make([]BlockInfo, nblocks)
 			for j := range blocks {
-				blocks[j].Length = r.readUint32()
+				blocks[j].Size = r.readUint32()
 				blocks[j].Hash = r.readBytes()
 			}
 			files[i].Blocks = blocks
@@ -98,7 +108,7 @@ func ReadIndex(r io.Reader) ([]FileInfo, error) {
 func (r *marshalReader) readRequest() request {
 	var req request
 	req.name = r.readString()
-	req.offset = r.readUint64()
+	req.offset = int64(r.readUint64())
 	req.size = r.readUint32()
 	req.hash = r.readBytes()
 	return req
@@ -107,3 +117,14 @@ func (r *marshalReader) readRequest() request {
 func (r *marshalReader) readResponse() []byte {
 	return r.readBytes()
 }
+
+func (r *marshalReader) readOptions() map[string]string {
+	n := r.readUint32()
+	opts := make(map[string]string, n)
+	for i := 0; i < int(n); i++ {
+		k := r.readString()
+		v := r.readString()
+		opts[k] = v
+	}
+	return opts
+}

protocol/messages_test.go

@@ -12,8 +12,9 @@ func TestIndex(t *testing.T) {
 	idx := []FileInfo{
 		{
 			"Foo",
-			0755,
+			FlagInvalid & FlagDeleted & 0755,
 			1234567890,
+			142,
 			[]BlockInfo{
 				{12345678, []byte("hash hash hash")},
 				{23456781, []byte("ash hash hashh")},
@@ -23,6 +24,7 @@ func TestIndex(t *testing.T) {
 			"Quux/Quux",
 			0644,
 			2345678901,
+			232323232,
 			[]BlockInfo{
 				{45678123, []byte("4321 hash hash hash")},
 				{56781234, []byte("3214 ash hash hashh")},
@@ -44,7 +46,7 @@ func TestIndex(t *testing.T) {
 }
 
 func TestRequest(t *testing.T) {
-	f := func(name string, offset uint64, size uint32, hash []byte) bool {
+	f := func(name string, offset int64, size uint32, hash []byte) bool {
 		var buf = new(bytes.Buffer)
 		var req = request{name, offset, size, hash}
 		var wr = marshalWriter{w: buf}
@@ -81,6 +83,7 @@ func BenchmarkWriteIndex(b *testing.B) {
 			"Foo",
 			0777,
 			1234567890,
+			424242,
 			[]BlockInfo{
 				{12345678, []byte("hash hash hash")},
 				{23456781, []byte("ash hash hashh")},
@@ -90,6 +93,7 @@ func BenchmarkWriteIndex(b *testing.B) {
 			"Quux/Quux",
 			0644,
 			2345678901,
+			323232,
 			[]BlockInfo{
 				{45678123, []byte("4321 hash hash hash")},
 				{56781234, []byte("3214 ash hash hashh")},
@@ -113,3 +117,23 @@ func BenchmarkWriteRequest(b *testing.B) {
 		wr.writeRequest(req)
 	}
 }
+
+func TestOptions(t *testing.T) {
+	opts := map[string]string{
+		"foo":     "bar",
+		"someKey": "otherValue",
+		"hello":   "",
+		"":        "42",
+	}
+
+	var buf = new(bytes.Buffer)
+	var wr = marshalWriter{w: buf}
+	wr.writeOptions(opts)
+
+	var rd = marshalReader{r: buf}
+	var ropts = rd.readOptions()
+
+	if !reflect.DeepEqual(opts, ropts) {
+		t.Error("Incorrect options marshal/demarshal")
+	}
+}

protocol/protocol.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log"
 	"sync"
 	"time"
 
@@ -18,18 +19,25 @@ const (
 	messageTypePing        = 4
 	messageTypePong        = 5
 	messageTypeIndexUpdate = 6
+	messageTypeOptions     = 7
+)
+
+const (
+	FlagDeleted = 1 << 12
+	FlagInvalid = 1 << 13
 )
 
 type FileInfo struct {
 	Name     string
 	Flags    uint32
 	Modified int64
+	Version  uint32
 	Blocks   []BlockInfo
 }
 
 type BlockInfo struct {
-	Length uint32
-	Hash   []byte
+	Size uint32
+	Hash []byte
 }
 
 type Model interface {
@@ -38,7 +46,7 @@ type Model interface {
 	// An index update was received from the peer node
 	IndexUpdate(nodeID string, files []FileInfo)
 	// A request was made by the peer node
-	Request(nodeID, name string, offset uint64, size uint32, hash []byte) ([]byte, error)
+	Request(nodeID, name string, offset int64, size uint32, hash []byte) ([]byte, error)
 	// The peer node closed the connection
 	Close(nodeID string, err error)
 }
@@ -46,21 +54,22 @@ type Model interface {
 type Connection struct {
 	sync.RWMutex
 
-	ID        string
-	receiver  Model
-	reader    io.Reader
-	mreader   *marshalReader
-	writer    io.Writer
-	mwriter   *marshalWriter
-	closed    bool
-	awaiting  map[int]chan asyncResult
-	nextId    int
-	indexSent map[string]int64
+	id          string
+	receiver    Model
+	reader      io.Reader
+	mreader     *marshalReader
+	writer      io.Writer
+	mwriter     *marshalWriter
+	closed      bool
+	awaiting    map[int]chan asyncResult
+	nextId      int
+	indexSent   map[string][2]int64
+	options     map[string]string
+	optionsLock sync.Mutex
 
 	hasSentIndex  bool
 	hasRecvdIndex bool
 
-	lastStatistics Statistics
 	statisticsLock sync.Mutex
 }
 
@@ -76,7 +85,7 @@ const (
 	pingIdleTime = 5 * time.Minute
 )
 
-func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver Model) *Connection {
+func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver Model, options map[string]string) *Connection {
 	flrd := flate.NewReader(reader)
 	flwr, err := flate.NewWriter(writer, flate.BestSpeed)
 	if err != nil {
@@ -84,22 +93,39 @@ func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver M
 	}
 
 	c := Connection{
-		receiver:       receiver,
-		reader:         flrd,
-		mreader:        &marshalReader{r: flrd},
-		writer:         flwr,
-		mwriter:        &marshalWriter{w: flwr},
-		awaiting:       make(map[int]chan asyncResult),
-		ID:             nodeID,
-		lastStatistics: Statistics{At: time.Now()},
+		id:       nodeID,
+		receiver: receiver,
+		reader:   flrd,
+		mreader:  &marshalReader{r: flrd},
+		writer:   flwr,
+		mwriter:  &marshalWriter{w: flwr},
+		awaiting: make(map[int]chan asyncResult),
 	}
 
 	go c.readerLoop()
 	go c.pingerLoop()
 
+	if options != nil {
+		go func() {
+			c.Lock()
+			c.mwriter.writeHeader(header{0, c.nextId, messageTypeOptions})
+			c.mwriter.writeOptions(options)
+			err := c.flush()
+			if err != nil {
+				log.Printf("Warning:", err)
+			}
+			c.nextId++
+			c.Unlock()
+		}()
+	}
+
 	return &c
 }
 
+func (c *Connection) ID() string {
+	return c.id
+}
+
 // Index writes the list of file information to the connected peer node
 func (c *Connection) Index(idx []FileInfo) {
 	c.Lock()
@@ -108,18 +134,18 @@ func (c *Connection) Index(idx []FileInfo) {
 		// This is the first time we send an index.
 		msgType = messageTypeIndex
 
-		c.indexSent = make(map[string]int64)
+		c.indexSent = make(map[string][2]int64)
 		for _, f := range idx {
-			c.indexSent[f.Name] = f.Modified
+			c.indexSent[f.Name] = [2]int64{f.Modified, int64(f.Version)}
 		}
 	} else {
 		// We have sent one full index. Only send updates now.
 		msgType = messageTypeIndexUpdate
 		var diff []FileInfo
 		for _, f := range idx {
-			if modified, ok := c.indexSent[f.Name]; !ok || f.Modified != modified {
+			if vs, ok := c.indexSent[f.Name]; !ok || f.Modified != vs[0] || int64(f.Version) != vs[1] {
 				diff = append(diff, f)
-				c.indexSent[f.Name] = f.Modified
+				c.indexSent[f.Name] = [2]int64{f.Modified, int64(f.Version)}
 			}
 		}
 		idx = diff
@@ -133,16 +159,16 @@ func (c *Connection) Index(idx []FileInfo) {
 	c.Unlock()
 
 	if err != nil {
-		c.Close(err)
+		c.close(err)
 		return
 	} else if c.mwriter.err != nil {
-		c.Close(c.mwriter.err)
+		c.close(c.mwriter.err)
 		return
 	}
 }
 
 // Request returns the bytes for the specified block after fetching them from the connected peer.
-func (c *Connection) Request(name string, offset uint64, size uint32, hash []byte) ([]byte, error) {
+func (c *Connection) Request(name string, offset int64, size uint32, hash []byte) ([]byte, error) {
 	c.Lock()
 	if c.closed {
 		c.Unlock()
@@ -154,13 +180,13 @@ func (c *Connection) Request(name string, offset uint64, size uint32, hash []byt
 	c.mwriter.writeRequest(request{name, offset, size, hash})
 	if c.mwriter.err != nil {
 		c.Unlock()
-		c.Close(c.mwriter.err)
+		c.close(c.mwriter.err)
 		return nil, c.mwriter.err
 	}
 	err := c.flush()
 	if err != nil {
 		c.Unlock()
-		c.Close(err)
+		c.close(err)
 		return nil, err
 	}
 	c.nextId = (c.nextId + 1) & 0xfff
@@ -173,7 +199,7 @@ func (c *Connection) Request(name string, offset uint64, size uint32, hash []byt
 	return res.val, res.err
 }
 
-func (c *Connection) Ping() bool {
+func (c *Connection) ping() bool {
 	c.Lock()
 	if c.closed {
 		c.Unlock()
@@ -185,11 +211,11 @@ func (c *Connection) Ping() bool {
 	err := c.flush()
 	if err != nil {
 		c.Unlock()
-		c.Close(err)
+		c.close(err)
 		return false
 	} else if c.mwriter.err != nil {
 		c.Unlock()
-		c.Close(c.mwriter.err)
+		c.close(c.mwriter.err)
 		return false
 	}
 	c.nextId = (c.nextId + 1) & 0xfff
@@ -199,9 +225,6 @@ func (c *Connection) Ping() bool {
 	return ok && res.err == nil
 }
 
-func (c *Connection) Stop() {
-}
-
 type flusher interface {
 	Flush() error
 }
@@ -213,7 +236,7 @@ func (c *Connection) flush() error {
 	return nil
 }
 
-func (c *Connection) Close(err error) {
+func (c *Connection) close(err error) {
 	c.Lock()
 	if c.closed {
 		c.Unlock()
@@ -226,7 +249,7 @@ func (c *Connection) Close(err error) {
 	c.awaiting = nil
 	c.Unlock()
 
-	c.receiver.Close(c.ID, err)
+	c.receiver.Close(c.id, err)
 }
 
 func (c *Connection) isClosed() bool {
@@ -240,11 +263,11 @@ loop:
 	for {
 		hdr := c.mreader.readHeader()
 		if c.mreader.err != nil {
-			c.Close(c.mreader.err)
+			c.close(c.mreader.err)
 			break loop
 		}
 		if hdr.version != 0 {
-			c.Close(fmt.Errorf("Protocol error: %s: unknown message version %#x", c.ID, hdr.version))
+			c.close(fmt.Errorf("Protocol error: %s: unknown message version %#x", c.ID, hdr.version))
 			break loop
 		}
 
@@ -252,10 +275,10 @@ loop:
 		case messageTypeIndex:
 			files := c.mreader.readIndex()
 			if c.mreader.err != nil {
-				c.Close(c.mreader.err)
+				c.close(c.mreader.err)
 				break loop
 			} else {
-				c.receiver.Index(c.ID, files)
+				c.receiver.Index(c.id, files)
 			}
 			c.Lock()
 			c.hasRecvdIndex = true
@@ -264,16 +287,16 @@ loop:
 		case messageTypeIndexUpdate:
 			files := c.mreader.readIndex()
 			if c.mreader.err != nil {
-				c.Close(c.mreader.err)
+				c.close(c.mreader.err)
 				break loop
 			} else {
-				c.receiver.IndexUpdate(c.ID, files)
+				c.receiver.IndexUpdate(c.id, files)
 			}
 
 		case messageTypeRequest:
 			req := c.mreader.readRequest()
 			if c.mreader.err != nil {
-				c.Close(c.mreader.err)
+				c.close(c.mreader.err)
 				break loop
 			}
 			go c.processRequest(hdr.msgID, req)
@@ -282,7 +305,7 @@ loop:
 			data := c.mreader.readResponse()
 
 			if c.mreader.err != nil {
-				c.Close(c.mreader.err)
+				c.close(c.mreader.err)
 				break loop
 			} else {
 				c.Lock()
@@ -302,10 +325,10 @@ loop:
 			err := c.flush()
 			c.Unlock()
 			if err != nil {
-				c.Close(err)
+				c.close(err)
 				break loop
 			} else if c.mwriter.err != nil {
-				c.Close(c.mwriter.err)
+				c.close(c.mwriter.err)
 				break loop
 			}
 
@@ -323,27 +346,33 @@ loop:
 				c.Unlock()
 			}
 
+		case messageTypeOptions:
+			c.optionsLock.Lock()
+			c.options = c.mreader.readOptions()
+			c.optionsLock.Unlock()
+
 		default:
-			c.Close(fmt.Errorf("Protocol error: %s: unknown message type %#x", c.ID, hdr.msgType))
+			c.close(fmt.Errorf("Protocol error: %s: unknown message type %#x", c.ID, hdr.msgType))
 			break loop
 		}
 	}
 }
 
 func (c *Connection) processRequest(msgID int, req request) {
-	data, _ := c.receiver.Request(c.ID, req.name, req.offset, req.size, req.hash)
+	data, _ := c.receiver.Request(c.id, req.name, req.offset, req.size, req.hash)
 
 	c.Lock()
 	c.mwriter.writeUint32(encodeHeader(header{0, msgID, messageTypeResponse}))
 	c.mwriter.writeResponse(data)
-	err := c.flush()
+	err := c.mwriter.err
+	if err == nil {
+		err = c.flush()
+	}
 	c.Unlock()
 
 	buffers.Put(data)
 	if err != nil {
-		c.Close(err)
-	} else if c.mwriter.err != nil {
-		c.Close(c.mwriter.err)
+		c.close(err)
 	}
 }
 
@@ -358,42 +387,41 @@ func (c *Connection) pingerLoop() {
 
 		if ready {
 			go func() {
-				rc <- c.Ping()
+				rc <- c.ping()
 			}()
 			select {
 			case ok := <-rc:
 				if !ok {
-					c.Close(fmt.Errorf("Ping failure"))
+					c.close(fmt.Errorf("Ping failure"))
 				}
 			case <-time.After(pingTimeout):
-				c.Close(fmt.Errorf("Ping timeout"))
+				c.close(fmt.Errorf("Ping timeout"))
 			}
 		}
 	}
 }
 
 type Statistics struct {
-	At             time.Time
-	InBytesTotal   int
-	InBytesPerSec  int
-	OutBytesTotal  int
-	OutBytesPerSec int
+	At            time.Time
+	InBytesTotal  int
+	OutBytesTotal int
 }
 
 func (c *Connection) Statistics() Statistics {
 	c.statisticsLock.Lock()
 	defer c.statisticsLock.Unlock()
 
-	secs := time.Since(c.lastStatistics.At).Seconds()
-	rt := int(c.mreader.getTot())
-	wt := int(c.mwriter.getTot())
 	stats := Statistics{
-		At:             time.Now(),
-		InBytesTotal:   rt,
-		InBytesPerSec:  int(float64(rt-c.lastStatistics.InBytesTotal) / secs),
-		OutBytesTotal:  wt,
-		OutBytesPerSec: int(float64(wt-c.lastStatistics.OutBytesTotal) / secs),
+		At:            time.Now(),
+		InBytesTotal:  int(c.mreader.getTot()),
+		OutBytesTotal: int(c.mwriter.getTot()),
 	}
-	c.lastStatistics = stats
+
 	return stats
 }
+
+func (c *Connection) Option(key string) string {
+	c.optionsLock.Lock()
+	defer c.optionsLock.Unlock()
+	return c.options[key]
+}

protocol/protocol_test.go

@@ -43,13 +43,13 @@ func TestPing(t *testing.T) {
 	ar, aw := io.Pipe()
 	br, bw := io.Pipe()
 
-	c0 := NewConnection("c0", ar, bw, nil)
-	c1 := NewConnection("c1", br, aw, nil)
+	c0 := NewConnection("c0", ar, bw, nil, nil)
+	c1 := NewConnection("c1", br, aw, nil, nil)
 
-	if ok := c0.Ping(); !ok {
+	if ok := c0.ping(); !ok {
 		t.Error("c0 ping failed")
 	}
-	if ok := c1.Ping(); !ok {
+	if ok := c1.ping(); !ok {
 		t.Error("c1 ping failed")
 	}
 }
@@ -67,10 +67,10 @@ func TestPingErr(t *testing.T) {
 			eaw := &ErrPipe{PipeWriter: *aw, max: i, err: e}
 			ebw := &ErrPipe{PipeWriter: *bw, max: j, err: e}
 
-			c0 := NewConnection("c0", ar, ebw, m0)
-			NewConnection("c1", br, eaw, m1)
+			c0 := NewConnection("c0", ar, ebw, m0, nil)
+			NewConnection("c1", br, eaw, m1, nil)
 
-			res := c0.Ping()
+			res := c0.ping()
 			if (i < 4 || j < 4) && res {
 				t.Errorf("Unexpected ping success; i=%d, j=%d", i, j)
 			} else if (i >= 8 && j >= 8) && !res {
@@ -94,8 +94,8 @@ func TestRequestResponseErr(t *testing.T) {
 			eaw := &ErrPipe{PipeWriter: *aw, max: i, err: e}
 			ebw := &ErrPipe{PipeWriter: *bw, max: j, err: e}
 
-			NewConnection("c0", ar, ebw, m0)
-			c1 := NewConnection("c1", br, eaw, m1)
+			NewConnection("c0", ar, ebw, m0, nil)
+			c1 := NewConnection("c1", br, eaw, m1, nil)
 
 			d, err := c1.Request("tn", 1234, 3456, []byte("hashbytes"))
 			if err == e || err == ErrClosed {
@@ -143,8 +143,8 @@ func TestVersionErr(t *testing.T) {
 	ar, aw := io.Pipe()
 	br, bw := io.Pipe()
 
-	c0 := NewConnection("c0", ar, bw, m0)
-	NewConnection("c1", br, aw, m1)
+	c0 := NewConnection("c0", ar, bw, m0, nil)
+	NewConnection("c1", br, aw, m1, nil)
 
 	c0.mwriter.writeHeader(header{
 		version: 2,
@@ -165,8 +165,8 @@ func TestTypeErr(t *testing.T) {
 	ar, aw := io.Pipe()
 	br, bw := io.Pipe()
 
-	c0 := NewConnection("c0", ar, bw, m0)
-	NewConnection("c1", br, aw, m1)
+	c0 := NewConnection("c0", ar, bw, m0, nil)
+	NewConnection("c1", br, aw, m1, nil)
 
 	c0.mwriter.writeHeader(header{
 		version: 0,
@@ -187,10 +187,10 @@ func TestClose(t *testing.T) {
 	ar, aw := io.Pipe()
 	br, bw := io.Pipe()
 
-	c0 := NewConnection("c0", ar, bw, m0)
-	NewConnection("c1", br, aw, m1)
+	c0 := NewConnection("c0", ar, bw, m0, nil)
+	NewConnection("c1", br, aw, m1, nil)
 
-	c0.Close(nil)
+	c0.close(nil)
 
 	ok := c0.isClosed()
 	if !ok {
@@ -199,7 +199,7 @@ func TestClose(t *testing.T) {
 
 	// None of these should panic, some should return an error
 
-	ok = c0.Ping()
+	ok = c0.ping()
 	if ok {
 		t.Error("Ping should not return true")
 	}

tls.go

@@ -3,7 +3,7 @@ package main
 import (
 	"crypto/rand"
 	"crypto/rsa"
-	"crypto/sha1"
+	"crypto/sha256"
 	"crypto/tls"
 	"crypto/x509"
 	"crypto/x509/pkix"
@@ -12,11 +12,12 @@ import (
 	"math/big"
 	"os"
 	"path"
+	"strings"
 	"time"
 )
 
 const (
-	tlsRSABits = 2048
+	tlsRSABits = 3072
 	tlsName    = "syncthing"
 )
 
@@ -25,13 +26,15 @@ func loadCert(dir string) (tls.Certificate, error) {
 }
 
 func certId(bs []byte) string {
-	hf := sha1.New()
+	hf := sha256.New()
 	hf.Write(bs)
 	id := hf.Sum(nil)
-	return base32.StdEncoding.EncodeToString(id)
+	return strings.Trim(base32.StdEncoding.EncodeToString(id), "=")
 }
 
 func newCertificate(dir string) {
+	infoln("Generating RSA certificate and key...")
+
 	priv, err := rsa.GenerateKey(rand.Reader, tlsRSABits)
 	fatalErr(err)
 
@@ -47,7 +50,7 @@ func newCertificate(dir string) {
 		NotAfter:  notAfter,
 
 		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
-		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
 		BasicConstraintsValid: true,
 	}
 
@@ -58,11 +61,11 @@ func newCertificate(dir string) {
 	fatalErr(err)
 	pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
 	certOut.Close()
-	okln("Created TLS certificate file")
+	okln("Created RSA certificate file")
 
 	keyOut, err := os.OpenFile(path.Join(dir, "key.pem"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
 	fatalErr(err)
 	pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
 	keyOut.Close()
-	okln("Created TLS key file")
+	okln("Created RSA key file")
 }

usage.go

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"io"
+	"text/tabwriter"
+)
+
+func optionTable(w io.Writer, rows [][]string) {
+	tw := tabwriter.NewWriter(w, 2, 4, 2, ' ', 0)
+	for _, row := range rows {
+		for i, cell := range row {
+			if i > 0 {
+				tw.Write([]byte("\t"))
+			}
+			tw.Write([]byte(cell))
+		}
+		tw.Write([]byte("\n"))
+	}
+	tw.Flush()
+}
+
+func usageFor(fs *flag.FlagSet, usage string) func() {
+	return func() {
+		var b bytes.Buffer
+		b.WriteString("Usage:\n  " + usage + "\n")
+
+		var options [][]string
+		fs.VisitAll(func(f *flag.Flag) {
+			var dash = "-"
+			if len(f.Name) > 1 {
+				dash = "--"
+			}
+			var opt = "  " + dash + f.Name
+
+			if f.DefValue != "false" {
+				opt += "=" + f.DefValue
+			}
+
+			options = append(options, []string{opt, f.Usage})
+		})
+
+		if len(options) > 0 {
+			b.WriteString("\nOptions:\n")
+			optionTable(&b, options)
+		}
+
+		fmt.Println(b.String())
+	}
+}

util.go

@@ -1,7 +1,29 @@
 package main
 
-import "time"
+import "fmt"
 
-func timing(name string, t0 time.Time) {
-	debugf("%s: %.02f ms", name, time.Since(t0).Seconds()*1000)
+func MetricPrefix(n int) string {
+	if n > 1e9 {
+		return fmt.Sprintf("%.02f G", float64(n)/1e9)
+	}
+	if n > 1e6 {
+		return fmt.Sprintf("%.02f M", float64(n)/1e6)
+	}
+	if n > 1e3 {
+		return fmt.Sprintf("%.01f k", float64(n)/1e3)
+	}
+	return fmt.Sprintf("%d ", n)
+}
+
+func BinaryPrefix(n int) string {
+	if n > 1<<30 {
+		return fmt.Sprintf("%.02f Gi", float64(n)/(1<<30))
+	}
+	if n > 1<<20 {
+		return fmt.Sprintf("%.02f Mi", float64(n)/(1<<20))
+	}
+	if n > 1<<10 {
+		return fmt.Sprintf("%.01f Ki", float64(n)/(1<<10))
+	}
+	return fmt.Sprintf("%d ", n)
 }

walk.go

@@ -1,154 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"os"
-	"path"
-	"path/filepath"
-	"strings"
-)
-
-const BlockSize = 128 * 1024
-
-type File struct {
-	Name     string
-	Flags    uint32
-	Modified int64
-	Blocks   BlockList
-}
-
-func (f File) Dump() {
-	fmt.Printf("%s\n", f.Name)
-	for _, b := range f.Blocks {
-		fmt.Printf("  %dB @ %d: %x\n", b.Length, b.Offset, b.Hash)
-	}
-	fmt.Println()
-}
-
-func (f File) Size() (bytes int) {
-	for _, b := range f.Blocks {
-		bytes += int(b.Length)
-	}
-	return
-}
-
-func isTempName(name string) bool {
-	return strings.HasPrefix(path.Base(name), ".syncthing.")
-}
-
-func tempName(name string, modified int64) string {
-	tdir := path.Dir(name)
-	tname := fmt.Sprintf(".syncthing.%s.%d", path.Base(name), modified)
-	return path.Join(tdir, tname)
-}
-
-func genWalker(base string, res *[]File, model *Model) filepath.WalkFunc {
-	return func(p string, info os.FileInfo, err error) error {
-		if err != nil {
-			warnln(err)
-			return nil
-		}
-
-		if isTempName(p) {
-			return nil
-		}
-
-		if info.Mode()&os.ModeType == 0 {
-			rn, err := filepath.Rel(base, p)
-			if err != nil {
-				warnln(err)
-				return nil
-			}
-
-			fi, err := os.Stat(p)
-			if err != nil {
-				warnln(err)
-				return nil
-			}
-			modified := fi.ModTime().Unix()
-
-			hf, ok := model.LocalFile(rn)
-			if ok && hf.Modified == modified {
-				// No change
-				*res = append(*res, hf)
-			} else {
-				if opts.Debug.TraceFile {
-					debugf("FILE: Hash %q", p)
-				}
-				fd, err := os.Open(p)
-				if err != nil {
-					warnln(err)
-					return nil
-				}
-				defer fd.Close()
-
-				blocks, err := Blocks(fd, BlockSize)
-				if err != nil {
-					warnln(err)
-					return nil
-				}
-				f := File{
-					Name:     rn,
-					Flags:    uint32(info.Mode()),
-					Modified: modified,
-					Blocks:   blocks,
-				}
-				*res = append(*res, f)
-			}
-		}
-
-		return nil
-	}
-}
-
-func Walk(dir string, model *Model, followSymlinks bool) []File {
-	var files []File
-	fn := genWalker(dir, &files, model)
-	err := filepath.Walk(dir, fn)
-	if err != nil {
-		warnln(err)
-	}
-
-	if !opts.NoSymlinks {
-		d, err := os.Open(dir)
-		if err != nil {
-			warnln(err)
-			return files
-		}
-		defer d.Close()
-
-		fis, err := d.Readdir(-1)
-		if err != nil {
-			warnln(err)
-			return files
-		}
-
-		for _, fi := range fis {
-			if fi.Mode()&os.ModeSymlink != 0 {
-				err := filepath.Walk(path.Join(dir, fi.Name())+"/", fn)
-				if err != nil {
-					warnln(err)
-				}
-			}
-		}
-	}
-
-	return files
-}
-
-func cleanTempFile(path string, info os.FileInfo, err error) error {
-	if err != nil {
-		return err
-	}
-	if info.Mode()&os.ModeType == 0 && isTempName(path) {
-		if opts.Debug.TraceFile {
-			debugf("FILE: Remove %q", path)
-		}
-		os.Remove(path)
-	}
-	return nil
-}
-
-func CleanTempFiles(dir string) {
-	filepath.Walk(dir, cleanTempFile)
-}

walk_test.go

@@ -1,42 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"testing"
-	"time"
-)
-
-var testdata = []struct {
-	name string
-	size int
-	hash string
-}{
-	{"bar", 10, "2f72cc11a6fcd0271ecef8c61056ee1eb1243be3805bf9a9df98f92f7636b05c"},
-	{"baz/quux", 9, "c154d94e94ba7298a6adb0523afe34d1b6a581d6b893a763d45ddc5e209dcb83"},
-	{"foo", 7, "aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f"},
-}
-
-func TestWalk(t *testing.T) {
-	m := new(Model)
-	files := Walk("testdata", m, false)
-
-	if l1, l2 := len(files), len(testdata); l1 != l2 {
-		t.Fatalf("Incorrect number of walked files %d != %d", l1, l2)
-	}
-
-	for i := range testdata {
-		if n1, n2 := testdata[i].name, files[i].Name; n1 != n2 {
-			t.Errorf("Incorrect file name %q != %q for case #%d", n1, n2, i)
-		}
-
-		if h1, h2 := fmt.Sprintf("%x", files[i].Blocks[0].Hash), testdata[i].hash; h1 != h2 {
-			t.Errorf("Incorrect hash %q != %q for case #%d", h1, h2, i)
-		}
-
-		t0 := time.Date(2010, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
-		t1 := time.Date(2020, 1, 1, 0, 0, 0, 0, time.UTC).Unix()
-		if mt := files[i].Modified; mt < t0 || mt > t1 {
-			t.Errorf("Unrealistic modtime %d for test %d", mt, i)
-		}
-	}
-}