Report CPU/mem usage in GUI

synch -> sync

.gitignore

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

README.md

@@ -25,146 +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: wrote cert.pem
-11:34:13 tls.go:67: OK: wrote key.pem
-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: OK: Connected to node CUGAE43Y5N64CRJU26YFH6MTWPSBLSUL
-13:31:19 main.go:345: INFO: Transferred 139 KiB in (14 KiB/s), 139 KiB out (14 KiB/s)
-...
-```
-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

@@ -1,25 +1,82 @@
 #!/bin/bash
 
 version=$(git describe --always)
+buildDir=dist
 
-go test ./... || exit 1
+if [[ $1 == "-f" ]] ; then
+	fast=yes
+	shift
+fi
 
-rm -rf build
-mkdir -p build || exit 1
+if [[ $fast != yes ]] ; then
+	go get -d
+	go test ./...
+fi
 
-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 "$name" \
-		&& tar zcf "$name.tar.gz" "$name" \
-		&& rm -r  "$name" \
-		&& mv "$name.tar.gz" build
+if [[ -z $1 ]] ; then
+	go build -ldflags "-X main.Version $version" \
+	&& nrsc syncthing gui
+elif [[ $1 == "tar" ]] ; then
+	go build -ldflags "-X main.Version $version" \
+	&& nrsc syncthing gui \
+	&& 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 $version" \
+				&& nrsc syncthing gui \
+				&& mkdir -p "$name" \
+				&& cp syncthing "$buildDir/$name" \
+				&& cp README.md LICENSE "$name" \
+				&& mv syncthing "$name" \
+				&& tar zcf "$buildDir/$name.tar.gz" "$name" \
+				&& rm -r  "$name"
+		done
 	done
-done
+
+	for goos in linux ; do
+		for goarm in 5 6 7 ; do
+			for goarch in arm ; do
+				echo "$goos-${goarch}v$goarm"
+				export GOARM="$goarm"
+				export GOOS="$goos"
+				export GOARCH="$goarch"
+				export name="syncthing-$goos-${goarch}v$goarm"
+				go build -ldflags "-X main.Version $version" \
+					&& nrsc syncthing gui \
+					&& mkdir -p "$name" \
+					&& cp syncthing "$buildDir/$name" \
+					&& cp README.md LICENSE "$name" \
+					&& mv syncthing "$name" \
+					&& tar zcf "$buildDir/$name.tar.gz" "$name" \
+					&& rm -r  "$name"
+			done
+		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 $version" \
+				&& nrsc syncthing.exe gui \
+				&& mkdir -p "$name" \
+				&& mv syncthing.exe "$buildDir/$name.exe" \
+				&& cp README.md LICENSE "$name" \
+				&& zip -qr "$buildDir/$name.zip" "$name" \
+				&& rm -r  "$name"
+		done
+	done
+fi

discover/discover.go

@@ -238,7 +238,7 @@ func (d *Discoverer) externalLookup(node string) (string, bool) {
 		return "", false
 	}
 
-	var buf = buffers.Get(1024)
+	var buf = buffers.Get(256)
 	defer buffers.Put(buf)
 
 	n, err := conn.Read(buf)

gui.go

@@ -0,0 +1,158 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"log"
+	"mime"
+	"net/http"
+	"path/filepath"
+	"runtime"
+	"sync"
+
+	"bitbucket.org/tebeka/nrsc"
+	"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)
+
+	go func() {
+		mr := martini.New()
+		mr.Use(nrscStatic("gui"))
+		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) {
+	var res = make(map[string]interface{})
+	res["repository"] = config.OptionMap("repository")
+	res["nodes"] = config.OptionMap("nodes")
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(res)
+}
+
+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["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)
+}
+
+func nrscStatic(path string) interface{} {
+	if err := nrsc.Initialize(); err != nil {
+		panic("Unable to initialize nrsc: " + err.Error())
+	}
+	return func(res http.ResponseWriter, req *http.Request, log *log.Logger) {
+		file := req.URL.Path
+
+		// nrsc expects there not to be a leading slash
+		if file[0] == '/' {
+			file = file[1:]
+		}
+
+		f := nrsc.Get(file)
+		if f == nil {
+			return
+		}
+
+		rdr, err := f.Open()
+		if err != nil {
+			http.Error(res, "Internal Server Error", http.StatusInternalServerError)
+		}
+		defer rdr.Close()
+
+		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", f.Size()))
+		res.Header().Set("Last-Modified", f.ModTime().UTC().Format(http.TimeFormat))
+
+		io.Copy(res, rdr)
+	}
+}

gui/angular.min.js

@@ -0,0 +1,203 @@
+/*
+ AngularJS v1.2.7
+ (c) 2010-2014 Google, Inc. http://angularjs.org
+ License: MIT
+*/
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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,
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+$$csp:Tb});Ta=Uc(Z);try{Ta("ngLocale")}catch(c){Ta("ngLocale",[]).provider("$locale",rd)}Ta("ng",["ngLocale"],["$provide",function(a){a.provider({$$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 +1,145 @@
+var syncthing = angular.module('syncthing', []);
+
+syncthing.controller('SyncthingCtrl', function ($scope, $http) {
+    var prevDate = 0;
+    var modelGetOK = 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/config").success(function (data) {
+        $scope.config = data;
+    });
+
+    $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;
+        });
+    };
+
+    $scope.refresh();
+    setInterval($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 '- '
+        }
+        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 '- '
+        }
+        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;
+    }
+});

gui/bootstrap/css/bootstrap-theme.css

@@ -0,0 +1,397 @@
+/*!
+ * Bootstrap v3.0.3 (http://getbootstrap.com)
+ * Copyright 2013 Twitter, Inc.
+ * Licensed under http://www.apache.org/licenses/LICENSE-2.0
+ */
+
+.btn-default,
+.btn-primary,
+.btn-success,
+.btn-info,
+.btn-warning,
+.btn-danger {
+  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.2);
+  -webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 1px 1px rgba(0, 0, 0, 0.075);
+          box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 1px 1px rgba(0, 0, 0, 0.075);
+}
+
+.btn-default:active,
+.btn-primary:active,
+.btn-success:active,
+.btn-info:active,
+.btn-warning:active,
+.btn-danger:active,
+.btn-default.active,
+.btn-primary.active,
+.btn-success.active,
+.btn-info.active,
+.btn-warning.active,
+.btn-danger.active {
+  -webkit-box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
+          box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125);
+}
+
+.btn:active,
+.btn.active {
+  background-image: none;
+}
+
+.btn-default {
+  text-shadow: 0 1px 0 #fff;
+  background-image: -webkit-linear-gradient(top, #ffffff 0%, #e0e0e0 100%);
+  background-image: linear-gradient(to bottom, #ffffff 0%, #e0e0e0 100%);
+  background-repeat: repeat-x;
+  border-color: #dbdbdb;
+  border-color: #ccc;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffffff', endColorstr='#ffe0e0e0', GradientType=0);
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
+}
+
+.btn-default:hover,
+.btn-default:focus {
+  background-color: #e0e0e0;
+  background-position: 0 -15px;
+}
+
+.btn-default:active,
+.btn-default.active {
+  background-color: #e0e0e0;
+  border-color: #dbdbdb;
+}
+
+.btn-primary {
+  background-image: -webkit-linear-gradient(top, #428bca 0%, #2d6ca2 100%);
+  background-image: linear-gradient(to bottom, #428bca 0%, #2d6ca2 100%);
+  background-repeat: repeat-x;
+  border-color: #2b669a;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff428bca', endColorstr='#ff2d6ca2', GradientType=0);
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
+}
+
+.btn-primary:hover,
+.btn-primary:focus {
+  background-color: #2d6ca2;
+  background-position: 0 -15px;
+}
+
+.btn-primary:active,
+.btn-primary.active {
+  background-color: #2d6ca2;
+  border-color: #2b669a;
+}
+
+.btn-success {
+  background-image: -webkit-linear-gradient(top, #5cb85c 0%, #419641 100%);
+  background-image: linear-gradient(to bottom, #5cb85c 0%, #419641 100%);
+  background-repeat: repeat-x;
+  border-color: #3e8f3e;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff5cb85c', endColorstr='#ff419641', GradientType=0);
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
+}
+
+.btn-success:hover,
+.btn-success:focus {
+  background-color: #419641;
+  background-position: 0 -15px;
+}
+
+.btn-success:active,
+.btn-success.active {
+  background-color: #419641;
+  border-color: #3e8f3e;
+}
+
+.btn-warning {
+  background-image: -webkit-linear-gradient(top, #f0ad4e 0%, #eb9316 100%);
+  background-image: linear-gradient(to bottom, #f0ad4e 0%, #eb9316 100%);
+  background-repeat: repeat-x;
+  border-color: #e38d13;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fff0ad4e', endColorstr='#ffeb9316', GradientType=0);
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
+}
+
+.btn-warning:hover,
+.btn-warning:focus {
+  background-color: #eb9316;
+  background-position: 0 -15px;
+}
+
+.btn-warning:active,
+.btn-warning.active {
+  background-color: #eb9316;
+  border-color: #e38d13;
+}
+
+.btn-danger {
+  background-image: -webkit-linear-gradient(top, #d9534f 0%, #c12e2a 100%);
+  background-image: linear-gradient(to bottom, #d9534f 0%, #c12e2a 100%);
+  background-repeat: repeat-x;
+  border-color: #b92c28;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffd9534f', endColorstr='#ffc12e2a', GradientType=0);
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
+}
+
+.btn-danger:hover,
+.btn-danger:focus {
+  background-color: #c12e2a;
+  background-position: 0 -15px;
+}
+
+.btn-danger:active,
+.btn-danger.active {
+  background-color: #c12e2a;
+  border-color: #b92c28;
+}
+
+.btn-info {
+  background-image: -webkit-linear-gradient(top, #5bc0de 0%, #2aabd2 100%);
+  background-image: linear-gradient(to bottom, #5bc0de 0%, #2aabd2 100%);
+  background-repeat: repeat-x;
+  border-color: #28a4c9;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff5bc0de', endColorstr='#ff2aabd2', GradientType=0);
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
+}
+
+.btn-info:hover,
+.btn-info:focus {
+  background-color: #2aabd2;
+  background-position: 0 -15px;
+}
+
+.btn-info:active,
+.btn-info.active {
+  background-color: #2aabd2;
+  border-color: #28a4c9;
+}
+
+.thumbnail,
+.img-thumbnail {
+  -webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.075);
+          box-shadow: 0 1px 2px rgba(0, 0, 0, 0.075);
+}
+
+.dropdown-menu > li > a:hover,
+.dropdown-menu > li > a:focus {
+  background-color: #e8e8e8;
+  background-image: -webkit-linear-gradient(top, #f5f5f5 0%, #e8e8e8 100%);
+  background-image: linear-gradient(to bottom, #f5f5f5 0%, #e8e8e8 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fff5f5f5', endColorstr='#ffe8e8e8', GradientType=0);
+}
+
+.dropdown-menu > .active > a,
+.dropdown-menu > .active > a:hover,
+.dropdown-menu > .active > a:focus {
+  background-color: #357ebd;
+  background-image: -webkit-linear-gradient(top, #428bca 0%, #357ebd 100%);
+  background-image: linear-gradient(to bottom, #428bca 0%, #357ebd 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff428bca', endColorstr='#ff357ebd', GradientType=0);
+}
+
+.navbar-default {
+  background-image: -webkit-linear-gradient(top, #ffffff 0%, #f8f8f8 100%);
+  background-image: linear-gradient(to bottom, #ffffff 0%, #f8f8f8 100%);
+  background-repeat: repeat-x;
+  border-radius: 4px;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffffffff', endColorstr='#fff8f8f8', GradientType=0);
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
+  -webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 1px 5px rgba(0, 0, 0, 0.075);
+          box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.15), 0 1px 5px rgba(0, 0, 0, 0.075);
+}
+
+.navbar-default .navbar-nav > .active > a {
+  background-image: -webkit-linear-gradient(top, #ebebeb 0%, #f3f3f3 100%);
+  background-image: linear-gradient(to bottom, #ebebeb 0%, #f3f3f3 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffebebeb', endColorstr='#fff3f3f3', GradientType=0);
+  -webkit-box-shadow: inset 0 3px 9px rgba(0, 0, 0, 0.075);
+          box-shadow: inset 0 3px 9px rgba(0, 0, 0, 0.075);
+}
+
+.navbar-brand,
+.navbar-nav > li > a {
+  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.25);
+}
+
+.navbar-inverse {
+  background-image: -webkit-linear-gradient(top, #3c3c3c 0%, #222222 100%);
+  background-image: linear-gradient(to bottom, #3c3c3c 0%, #222222 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff3c3c3c', endColorstr='#ff222222', GradientType=0);
+  filter: progid:DXImageTransform.Microsoft.gradient(enabled=false);
+}
+
+.navbar-inverse .navbar-nav > .active > a {
+  background-image: -webkit-linear-gradient(top, #222222 0%, #282828 100%);
+  background-image: linear-gradient(to bottom, #222222 0%, #282828 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff222222', endColorstr='#ff282828', GradientType=0);
+  -webkit-box-shadow: inset 0 3px 9px rgba(0, 0, 0, 0.25);
+          box-shadow: inset 0 3px 9px rgba(0, 0, 0, 0.25);
+}
+
+.navbar-inverse .navbar-brand,
+.navbar-inverse .navbar-nav > li > a {
+  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
+}
+
+.navbar-static-top,
+.navbar-fixed-top,
+.navbar-fixed-bottom {
+  border-radius: 0;
+}
+
+.alert {
+  text-shadow: 0 1px 0 rgba(255, 255, 255, 0.2);
+  -webkit-box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 1px 2px rgba(0, 0, 0, 0.05);
+          box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.25), 0 1px 2px rgba(0, 0, 0, 0.05);
+}
+
+.alert-success {
+  background-image: -webkit-linear-gradient(top, #dff0d8 0%, #c8e5bc 100%);
+  background-image: linear-gradient(to bottom, #dff0d8 0%, #c8e5bc 100%);
+  background-repeat: repeat-x;
+  border-color: #b2dba1;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffdff0d8', endColorstr='#ffc8e5bc', GradientType=0);
+}
+
+.alert-info {
+  background-image: -webkit-linear-gradient(top, #d9edf7 0%, #b9def0 100%);
+  background-image: linear-gradient(to bottom, #d9edf7 0%, #b9def0 100%);
+  background-repeat: repeat-x;
+  border-color: #9acfea;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffd9edf7', endColorstr='#ffb9def0', GradientType=0);
+}
+
+.alert-warning {
+  background-image: -webkit-linear-gradient(top, #fcf8e3 0%, #f8efc0 100%);
+  background-image: linear-gradient(to bottom, #fcf8e3 0%, #f8efc0 100%);
+  background-repeat: repeat-x;
+  border-color: #f5e79e;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fffcf8e3', endColorstr='#fff8efc0', GradientType=0);
+}
+
+.alert-danger {
+  background-image: -webkit-linear-gradient(top, #f2dede 0%, #e7c3c3 100%);
+  background-image: linear-gradient(to bottom, #f2dede 0%, #e7c3c3 100%);
+  background-repeat: repeat-x;
+  border-color: #dca7a7;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fff2dede', endColorstr='#ffe7c3c3', GradientType=0);
+}
+
+.progress {
+  background-image: -webkit-linear-gradient(top, #ebebeb 0%, #f5f5f5 100%);
+  background-image: linear-gradient(to bottom, #ebebeb 0%, #f5f5f5 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffebebeb', endColorstr='#fff5f5f5', GradientType=0);
+}
+
+.progress-bar {
+  background-image: -webkit-linear-gradient(top, #428bca 0%, #3071a9 100%);
+  background-image: linear-gradient(to bottom, #428bca 0%, #3071a9 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff428bca', endColorstr='#ff3071a9', GradientType=0);
+}
+
+.progress-bar-success {
+  background-image: -webkit-linear-gradient(top, #5cb85c 0%, #449d44 100%);
+  background-image: linear-gradient(to bottom, #5cb85c 0%, #449d44 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff5cb85c', endColorstr='#ff449d44', GradientType=0);
+}
+
+.progress-bar-info {
+  background-image: -webkit-linear-gradient(top, #5bc0de 0%, #31b0d5 100%);
+  background-image: linear-gradient(to bottom, #5bc0de 0%, #31b0d5 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff5bc0de', endColorstr='#ff31b0d5', GradientType=0);
+}
+
+.progress-bar-warning {
+  background-image: -webkit-linear-gradient(top, #f0ad4e 0%, #ec971f 100%);
+  background-image: linear-gradient(to bottom, #f0ad4e 0%, #ec971f 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fff0ad4e', endColorstr='#ffec971f', GradientType=0);
+}
+
+.progress-bar-danger {
+  background-image: -webkit-linear-gradient(top, #d9534f 0%, #c9302c 100%);
+  background-image: linear-gradient(to bottom, #d9534f 0%, #c9302c 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffd9534f', endColorstr='#ffc9302c', GradientType=0);
+}
+
+.list-group {
+  border-radius: 4px;
+  -webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.075);
+          box-shadow: 0 1px 2px rgba(0, 0, 0, 0.075);
+}
+
+.list-group-item.active,
+.list-group-item.active:hover,
+.list-group-item.active:focus {
+  text-shadow: 0 -1px 0 #3071a9;
+  background-image: -webkit-linear-gradient(top, #428bca 0%, #3278b3 100%);
+  background-image: linear-gradient(to bottom, #428bca 0%, #3278b3 100%);
+  background-repeat: repeat-x;
+  border-color: #3278b3;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff428bca', endColorstr='#ff3278b3', GradientType=0);
+}
+
+.panel {
+  -webkit-box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
+          box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
+}
+
+.panel-default > .panel-heading {
+  background-image: -webkit-linear-gradient(top, #f5f5f5 0%, #e8e8e8 100%);
+  background-image: linear-gradient(to bottom, #f5f5f5 0%, #e8e8e8 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fff5f5f5', endColorstr='#ffe8e8e8', GradientType=0);
+}
+
+.panel-primary > .panel-heading {
+  background-image: -webkit-linear-gradient(top, #428bca 0%, #357ebd 100%);
+  background-image: linear-gradient(to bottom, #428bca 0%, #357ebd 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ff428bca', endColorstr='#ff357ebd', GradientType=0);
+}
+
+.panel-success > .panel-heading {
+  background-image: -webkit-linear-gradient(top, #dff0d8 0%, #d0e9c6 100%);
+  background-image: linear-gradient(to bottom, #dff0d8 0%, #d0e9c6 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffdff0d8', endColorstr='#ffd0e9c6', GradientType=0);
+}
+
+.panel-info > .panel-heading {
+  background-image: -webkit-linear-gradient(top, #d9edf7 0%, #c4e3f3 100%);
+  background-image: linear-gradient(to bottom, #d9edf7 0%, #c4e3f3 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffd9edf7', endColorstr='#ffc4e3f3', GradientType=0);
+}
+
+.panel-warning > .panel-heading {
+  background-image: -webkit-linear-gradient(top, #fcf8e3 0%, #faf2cc 100%);
+  background-image: linear-gradient(to bottom, #fcf8e3 0%, #faf2cc 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fffcf8e3', endColorstr='#fffaf2cc', GradientType=0);
+}
+
+.panel-danger > .panel-heading {
+  background-image: -webkit-linear-gradient(top, #f2dede 0%, #ebcccc 100%);
+  background-image: linear-gradient(to bottom, #f2dede 0%, #ebcccc 100%);
+  background-repeat: repeat-x;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#fff2dede', endColorstr='#ffebcccc', GradientType=0);
+}
+
+.well {
+  background-image: -webkit-linear-gradient(top, #e8e8e8 0%, #f5f5f5 100%);
+  background-image: linear-gradient(to bottom, #e8e8e8 0%, #f5f5f5 100%);
+  background-repeat: repeat-x;
+  border-color: #dcdcdc;
+  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#ffe8e8e8', endColorstr='#fff5f5f5', GradientType=0);
+  -webkit-box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 0 rgba(255, 255, 255, 0.1);
+          box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 0 rgba(255, 255, 255, 0.1);
+}

gui/index.html

@@ -0,0 +1,162 @@
+<!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.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;
+}
+</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-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 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 ng-show="model.needFiles > 0">
+                    <h2>Files to Synchronize</h2>
+                    <table class="table table-condensed table-striped">
+                        <tr ng-repeat="file in need track by $index">
+                            <td><abbr title="{{file.Name}}">{{file.ShortName}}</abbr></td>
+                            <td class="text-right">{{file.Size | binary}}B</td>
+                        </tr>
+                    </table>
+                </div>
+            </div>
+            <div class="col-md-6">
+                <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="(node, address) in config.nodes" ng-class="{'text-primary': !!connections[node]}">
+                            <td><abbr class="text-monospace" title="{{node}}">{{node | short}}</abbr></td>
+                            <td>
+                                <span ng-show="!!connections[node]">
+                                    <span class="glyphicon glyphicon-link"></span>
+                                    {{connections[node].Address}}
+                                </span>
+                                <span ng-hide="!!connections[node]">
+                                    <span class="glyphicon glyphicon-cog"></span>
+                                    {{address}}
+                                </span>
+                            </td>
+                            <td class="text-right">
+                                <abbr title="{{connections[node].InBytesTotal | binary}}B">{{connections[node].inbps | metric}}b/s</abbr>
+                                <span class="text-muted glyphicon glyphicon-cloud-download"></span>
+                            </td>
+                            <td class="text-right">
+                                <abbr title="{{connections[node].OutBytesTotal | binary}}B">{{connections[node].outbps | metric}}b/s</abbr>
+                                <span class="text-muted glyphicon glyphicon-cloud-upload"></span>
+                            </td>
+                        </tr>
+                        </tbody>
+                    </table>
+                </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>
+
+<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_unix.go

@@ -0,0 +1,31 @@
+//+build !windows
+
+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
+	}
+}

logger.go

@@ -6,21 +6,16 @@ import (
 	"os"
 )
 
-var debugEnabled = true
-var logger = log.New(os.Stderr, "", log.Lshortfile|log.Ltime)
+var logger = log.New(os.Stderr, "", log.Ltime)
 
 func debugln(vals ...interface{}) {
-	if debugEnabled {
-		s := fmt.Sprintln(vals...)
-		logger.Output(2, "DEBUG: "+s)
-	}
+	s := fmt.Sprintln(vals...)
+	logger.Output(2, "DEBUG: "+s)
 }
 
 func debugf(format string, vals ...interface{}) {
-	if debugEnabled {
-		s := fmt.Sprintf(format, vals...)
-		logger.Output(2, "DEBUG: "+s)
-	}
+	s := fmt.Sprintf(format, vals...)
+	logger.Output(2, "DEBUG: "+s)
 }
 
 func infoln(vals ...interface{}) {

main.go

@@ -1,7 +1,7 @@
 package main
 
 import (
-	"crypto/sha1"
+	"compress/gzip"
 	"crypto/tls"
 	"fmt"
 	"log"
@@ -10,6 +10,8 @@ import (
 	_ "net/http/pprof"
 	"os"
 	"path"
+	"runtime"
+	"runtime/debug"
 	"strconv"
 	"strings"
 	"time"
@@ -17,25 +19,31 @@ import (
 	"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"`
-	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"`
+	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"`
+	Rehash      bool             `long:"rehash" description:"Ignore cache and rehash all files in repository"`
+	NoDelete    bool             `long:"no-delete" description:"Never delete files"`
+	NoSymlinks  bool             `long:"no-symlinks" description:"Don't follow first level symlinks in the repo"`
+	NoStats     bool             `long:"no-stats" description:"Don't print model and connection statistics"`
+	NoGUI       bool             `long:"no-gui" description:"Don't start GUI"`
+	GUIAddr     string           `long:"gui-addr" description:"GUI listen address" default:"127.0.0.1:8080" value-name:"ADDR"`
+	ShowVersion bool             `short:"v" long:"version" description:"Show version"`
+	Discovery   DiscoveryOptions `group:"Discovery Options"`
+	Advanced    AdvancedOptions  `group:"Advanced Options"`
+	Debug       DebugOptions     `group:"Debugging Options"`
 }
 
 type DebugOptions struct {
-	TraceFile bool   `long:"trace-file"`
-	TraceNet  bool   `long:"trace-net"`
-	TraceIdx  bool   `long:"trace-idx"`
-	Profiler  string `long:"profiler" value-name:"ADDR"`
+	LogSource    bool     `long:"log-source"`
+	TraceModel   []string `long:"trace-model" value-name:"TRACE" description:"idx, net, file, need"`
+	TraceConnect bool     `long:"trace-connect"`
+	Profiler     string   `long:"profiler" value-name:"ADDR"`
 }
 
 type DiscoveryOptions struct {
@@ -46,8 +54,8 @@ type DiscoveryOptions struct {
 }
 
 type AdvancedOptions struct {
-	RequestsInFlight int           `long:"reqs-in-flight" description:"Parallell in flight requests per file" default:"8" value-name:"REQS"`
-	FilesInFlight    int           `long:"files-in-flight" description:"Parallell in flight file pulls" default:"4" value-name:"FILES"`
+	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"`
 }
@@ -56,7 +64,6 @@ var opts Options
 var Version string = "unknown-dev"
 
 const (
-	confDirName  = ".syncthing"
 	confFileName = "syncthing.ini"
 )
 
@@ -65,32 +72,39 @@ var (
 	nodeAddrs = make(map[string][]string)
 )
 
-// Options
-var (
-	ConfDir = path.Join(getHomeDir(), confDirName)
-)
-
 func main() {
-	// Useful for debugging; to be adjusted.
-	log.SetFlags(log.Ltime | log.Lshortfile)
-
 	_, err := flags.Parse(&opts)
 	if err != nil {
+		fatalln(err)
+	}
+
+	if opts.ShowVersion {
+		fmt.Println(Version)
 		os.Exit(0)
 	}
-	if strings.HasPrefix(opts.ConfDir, "~/") {
-		opts.ConfDir = strings.Replace(opts.ConfDir, "~", getHomeDir(), 1)
+
+	if len(os.Getenv("GOGC")) == 0 {
+		debug.SetGCPercent(25)
 	}
 
+	if len(os.Getenv("GOMAXPROCS")) == 0 {
+		runtime.GOMAXPROCS(runtime.NumCPU())
+	}
+
+	if len(opts.Debug.TraceModel) > 0 || opts.Debug.LogSource {
+		logger = log.New(os.Stderr, "", log.Lshortfile|log.Ldate|log.Ltime|log.Lmicroseconds)
+	}
+	opts.ConfDir = expandTilde(opts.ConfDir)
+
 	infoln("Version", Version)
 
 	// Ensure that our home directory exists and that we have a certificate and key.
 
-	ensureDir(ConfDir, 0700)
-	cert, err := loadCert(ConfDir)
+	ensureDir(opts.ConfDir, 0700)
+	cert, err := loadCert(opts.ConfDir)
 	if err != nil {
-		newCertificate(ConfDir)
-		cert, err = loadCert(ConfDir)
+		newCertificate(opts.ConfDir)
+		cert, err = loadCert(opts.ConfDir)
 		fatalErr(err)
 	}
 
@@ -110,16 +124,18 @@ func main() {
 	// connections.
 
 	cfg := &tls.Config{
-		ClientAuth:         tls.RequestClientCert,
-		ServerName:         "syncthing",
-		NextProtos:         []string{"bep/1.0"},
-		InsecureSkipVerify: true,
-		Certificates:       []tls.Certificate{cert},
+		Certificates:           []tls.Certificate{cert},
+		NextProtos:             []string{"bep/1.0"},
+		ServerName:             myID,
+		ClientAuth:             tls.RequestClientCert,
+		SessionTicketsDisabled: true,
+		InsecureSkipVerify:     true,
+		MinVersion:             tls.VersionTLS12,
 	}
 
 	// Load the configuration file, if it exists.
 
-	cf, err := os.Open(path.Join(ConfDir, confFileName))
+	cf, err := os.Open(path.Join(opts.ConfDir, confFileName))
 	if err != nil {
 		fatalln("No config file")
 		config = ini.Config{}
@@ -127,7 +143,7 @@ func main() {
 	config = ini.Parse(cf)
 	cf.Close()
 
-	var dir = config.Get("repository", "dir")
+	var dir = expandTilde(config.Get("repository", "dir"))
 
 	// Create a map of desired node connections based on the configuration file
 	// directives.
@@ -138,13 +154,34 @@ func main() {
 	}
 
 	ensureDir(dir, -1)
-	m := NewModel(dir)
+	m := model.NewModel(dir)
+	for _, t := range opts.Debug.TraceModel {
+		m.Trace(t)
+	}
+
+	// GUI
+	if !opts.NoGUI && opts.GUIAddr != "" {
+		host, port, err := net.SplitHostPort(opts.GUIAddr)
+		if err != nil {
+			warnf("Cannot start GUI on %q: %v", opts.GUIAddr, err)
+		} else {
+			if len(host) > 0 {
+				infof("Starting web GUI on http://%s", opts.GUIAddr)
+			} else {
+				infof("Starting web GUI on port %s", port)
+			}
+			startGUI(opts.GUIAddr, m)
+		}
+	}
 
 	// Walk the repository and update the local model before establishing any
 	// connections to other nodes.
 
-	infoln("Initial repository scan in progress")
-	loadIndex(m)
+	if !opts.Rehash {
+		infoln("Loading index cache")
+		loadIndex(m)
+	}
+	infoln("Populating repository index")
 	updateLocalModel(m)
 
 	// Routine to listen for incoming connections
@@ -158,10 +195,15 @@ func main() {
 	// 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 opts.NoDelete {
+			infoln("Deletes from peer nodes will be ignored")
+		} else {
+			infoln("Deletes from peer nodes are allowed")
+		}
+		okln("Ready to synchronize (read-write)")
+		m.StartRW(!opts.NoDelete, opts.Advanced.FilesInFlight, opts.Advanced.RequestsInFlight)
+	} else {
+		okln("Ready to synchronize (read only; no external updates accepted)")
 	}
 
 	// Periodically scan the repository and update the local model.
@@ -173,10 +215,46 @@ func main() {
 		}
 	}()
 
+	if !opts.NoStats {
+		// Periodically print statistics
+		go printStatsLoop(m)
+	}
+
 	select {}
 }
 
-func listen(myID string, addr string, m *Model, cfg *tls.Config) {
+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, 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, cfg *tls.Config) {
 	l, err := tls.Listen("tcp", addr, cfg)
 	fatalErr(err)
 
@@ -188,7 +266,7 @@ listen:
 			continue
 		}
 
-		if opts.Debug.TraceNet {
+		if opts.Debug.TraceConnect {
 			debugln("NET: Connect from", conn.RemoteAddr())
 		}
 
@@ -214,9 +292,8 @@ listen:
 
 		for nodeID := range nodeAddrs {
 			if nodeID == remoteID {
-				nc := protocol.NewConnection(remoteID, conn, conn, m)
-				m.AddNode(nc)
-				okln("Connected to nodeID", remoteID, "(in)")
+				protoConn := protocol.NewConnection(remoteID, conn, conn, m)
+				m.AddConnection(conn, protoConn)
 				continue listen
 			}
 		}
@@ -224,7 +301,7 @@ listen:
 	}
 }
 
-func connect(myID string, addr string, nodeAddrs map[string][]string, m *Model, cfg *tls.Config) {
+func connect(myID string, addr string, nodeAddrs map[string][]string, m *model.Model, cfg *tls.Config) {
 	_, portstr, err := net.SplitHostPort(addr)
 	fatalErr(err)
 	port, _ := strconv.Atoi(portstr)
@@ -267,12 +344,12 @@ func connect(myID string, addr string, nodeAddrs map[string][]string, m *Model,
 					}
 				}
 
-				if opts.Debug.TraceNet {
+				if opts.Debug.TraceConnect {
 					debugln("NET: Dial", nodeID, addr)
 				}
 				conn, err := tls.Dial("tcp", addr, cfg)
 				if err != nil {
-					if opts.Debug.TraceNet {
+					if opts.Debug.TraceConnect {
 						debugln("NET:", err)
 					}
 					continue
@@ -285,9 +362,8 @@ func connect(myID string, addr string, nodeAddrs map[string][]string, m *Model,
 					continue
 				}
 
-				nc := protocol.NewConnection(nodeID, conn, conn, m)
-				m.AddNode(nc)
-				okln("Connected to node", remoteID, "(out)")
+				protoConn := protocol.NewConnection(remoteID, conn, conn, m)
+				m.AddConnection(conn, protoConn)
 				continue nextNode
 			}
 		}
@@ -296,35 +372,47 @@ func connect(myID string, addr string, nodeAddrs map[string][]string, m *Model,
 	}
 }
 
-func updateLocalModel(m *Model) {
-	files := Walk(m.Dir(), m, !opts.NoSymlinks)
+func updateLocalModel(m *model.Model) {
+	files, _ := m.Walk(!opts.NoSymlinks)
 	m.ReplaceLocal(files)
 	saveIndex(m)
 }
 
-func saveIndex(m *Model) {
-	fname := fmt.Sprintf("%x.idx", sha1.Sum([]byte(m.Dir())))
-	idxf, err := os.Create(path.Join(ConfDir, fname))
+func saveIndex(m *model.Model) {
+	name := m.RepoID() + ".idx.gz"
+	fullName := path.Join(opts.ConfDir, name)
+	idxf, err := os.Create(fullName + ".tmp")
 	if err != nil {
 		return
 	}
-	protocol.WriteIndex(idxf, m.ProtocolIndex())
+
+	gzw := gzip.NewWriter(idxf)
+
+	protocol.WriteIndex(gzw, m.ProtocolIndex())
+	gzw.Close()
 	idxf.Close()
+	os.Rename(fullName+".tmp", fullName)
 }
 
-func loadIndex(m *Model) {
-	fname := fmt.Sprintf("%x.idx", sha1.Sum([]byte(m.Dir())))
-	idxf, err := os.Open(path.Join(ConfDir, fname))
+func loadIndex(m *model.Model) {
+	name := m.RepoID() + ".idx.gz"
+	idxf, err := os.Open(path.Join(opts.ConfDir, name))
 	if err != nil {
 		return
 	}
 	defer idxf.Close()
 
-	idx, err := protocol.ReadIndex(idxf)
+	gzr, err := gzip.NewReader(idxf)
 	if err != nil {
 		return
 	}
-	m.SeedIndex(idx)
+	defer gzr.Close()
+
+	idx, err := protocol.ReadIndex(gzr)
+	if err != nil {
+		return
+	}
+	m.SeedLocal(idx)
 }
 
 func ensureDir(dir string, mode int) {
@@ -338,6 +426,13 @@ 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

@@ -1,519 +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 (
-	"errors"
-	"fmt"
-	"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
-
-	updatedLocal int64 // timestamp of last update to local
-	updateGlobal int64 // timestamp of last update to remote
-
-	lastIdxBcast        time.Time
-	lastIdxBcastRequest time.Time
-}
-
-var (
-	errNoSuchNode = errors.New("no such node")
-)
-
-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),
-		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) && stats.Latency > 0 {
-			infof("%s: %sB/s in, %sB/s out, %0.02f ms", node, toSI(stats.InBytesPerSec), toSI(stats.OutBytesPerSec), stats.Latency.Seconds()*1000)
-		} else 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) {
-	m.Lock()
-	defer m.Unlock()
-
-	if opts.Debug.TraceNet {
-		debugf("NET CLOSE: %s", node)
-	}
-
-	delete(m.remote, node)
-	delete(m.nodes, 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, errNoSuchNode
-	}
-
-	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) AddNode(node *protocol.Connection) {
-	m.Lock()
-	m.nodes[node.ID] = node
-	m.Unlock()
-	m.RLock()
-	idx := m.protocolIndex()
-	m.RUnlock()
-
-	if opts.Debug.TraceNet {
-		debugf("NET IDX(out/add): %s: %d files", node.ID, len(idx))
-	}
-
-	// Sending the index might take a while if we have many files and a slow
-	// uplink. Return from AddNode in the meantime.
-	go node.Index(idx)
-}
-
-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,
-		})
-		buffers.Put(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"
@@ -6,8 +6,6 @@ import (
 	"io"
 )
 
-type BlockList []Block
-
 type Block struct {
 	Offset uint64
 	Length uint32
@@ -15,8 +13,8 @@ type Block struct {
 }
 
 // Blocks returns the blockwise hash of the reader.
-func Blocks(r io.Reader, blocksize int) (BlockList, error) {
-	var blocks BlockList
+func Blocks(r io.Reader, blocksize int) ([]Block, error) {
+	var blocks []Block
 	var offset uint64
 	for {
 		lr := &io.LimitedReader{r, int64(blocksize)}
@@ -42,9 +40,9 @@ func Blocks(r io.Reader, blocksize int) (BlockList, error) {
 	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"
@@ -98,7 +98,7 @@ 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 {

model/model.go

@@ -0,0 +1,663 @@
+package model
+
+/*
+
+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 (
+	"crypto/sha1"
+	"errors"
+	"fmt"
+	"io"
+	"log"
+	"net"
+	"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
+	protoConn map[string]Connection
+	rawConn   map[string]io.Closer
+
+	updatedLocal int64 // timestamp of last update to local
+	updateGlobal int64 // timestamp of last update to remote
+
+	lastIdxBcast        time.Time
+	lastIdxBcastRequest time.Time
+
+	rwRunning      bool
+	parallellFiles int
+	paralllelReqs  int
+	delete         bool
+
+	trace map[string]bool
+
+	fileLastChanged   map[string]time.Time
+	fileWasSuppressed map[string]int
+}
+
+type Connection interface {
+	ID() string
+	Index([]protocol.FileInfo)
+	Request(name string, offset uint64, size uint32, hash []byte) ([]byte, error)
+	Statistics() protocol.Statistics
+}
+
+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) *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),
+		protoConn:         make(map[string]Connection),
+		rawConn:           make(map[string]io.Closer),
+		lastIdxBcast:      time.Now(),
+		trace:             make(map[string]bool),
+		fileLastChanged:   make(map[string]time.Time),
+		fileWasSuppressed: make(map[string]int),
+	}
+
+	go m.broadcastIndexLoop()
+	return m
+}
+
+// Trace enables trace logging of the given facility. This is a debugging function; grep for m.trace.
+func (m *Model) Trace(t string) {
+	m.Lock()
+	defer m.Unlock()
+	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, pfiles, preqs int) {
+	m.Lock()
+	defer m.Unlock()
+
+	if m.rwRunning {
+		panic("starting started model")
+	}
+
+	m.rwRunning = true
+	m.delete = del
+	m.parallellFiles = pfiles
+	m.paralllelReqs = preqs
+
+	go m.cleanTempFiles()
+	go m.puller()
+}
+
+// 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.RLock()
+	defer m.RUnlock()
+
+	return m.updatedLocal + m.updateGlobal
+}
+
+type ConnectionInfo struct {
+	protocol.Statistics
+	Address 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.RLock()
+	defer m.RUnlock()
+
+	var res = make(map[string]ConnectionInfo)
+	for node, conn := range m.protoConn {
+		ci := ConnectionInfo{
+			Statistics: conn.Statistics(),
+		}
+		if nc, ok := m.rawConn[node].(remoteAddrer); ok {
+			ci.Address = nc.RemoteAddr().String()
+		}
+		res[node] = ci
+	}
+	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.RLock()
+	defer m.RUnlock()
+
+	for _, f := range m.global {
+		if f.Flags&protocol.FlagDeleted == 0 {
+			files++
+			bytes += f.Size()
+		} else {
+			deleted++
+		}
+	}
+	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.RLock()
+	defer m.RUnlock()
+
+	for _, f := range m.local {
+		if f.Flags&protocol.FlagDeleted == 0 {
+			files++
+			bytes += f.Size()
+		} else {
+			deleted++
+		}
+	}
+	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.RLock()
+	defer m.RUnlock()
+
+	for n, f := range m.local {
+		if gf, ok := m.global[n]; ok && f.Equals(gf) {
+			files++
+			bytes += f.Size()
+		}
+	}
+	return
+}
+
+// NeedFiles returns the list of currently needed files and the total size.
+func (m *Model) NeedFiles() (files []File, bytes int) {
+	m.RLock()
+	defer m.RUnlock()
+
+	for n := range m.need {
+		f := m.global[n]
+		files = append(files, f)
+		bytes += f.Size()
+	}
+	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) {
+	m.Lock()
+	defer m.Unlock()
+
+	if m.trace["net"] {
+		log.Printf("NET IDX(in): %s: %d files", nodeID, len(fs))
+	}
+
+	repo := make(map[string]File)
+	for _, f := range fs {
+		m.indexUpdate(repo, f)
+	}
+	m.remote[nodeID] = repo
+
+	m.recomputeGlobal()
+	m.recomputeNeed()
+}
+
+// IndexUpdate is called for incremental updates to connected nodes' indexes.
+// Implements the protocol.Model interface.
+func (m *Model) IndexUpdate(nodeID string, fs []protocol.FileInfo) {
+	m.Lock()
+	defer m.Unlock()
+
+	if m.trace["net"] {
+		log.Printf("NET IDXUP(in): %s: %d files", nodeID, len(fs))
+	}
+
+	repo, ok := m.remote[nodeID]
+	if !ok {
+		log.Printf("WARNING: Index update from node %s that does not have an index", nodeID)
+		return
+	}
+
+	for _, f := range fs {
+		m.indexUpdate(repo, f)
+	}
+
+	m.recomputeGlobal()
+	m.recomputeNeed()
+}
+
+func (m *Model) indexUpdate(repo map[string]File, f protocol.FileInfo) {
+	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] = fileFromFileInfo(f)
+}
+
+// Close removes the peer from the model and closes the underlyign connection if possible.
+// Implements the protocol.Model interface.
+func (m *Model) Close(node string, err error) {
+	m.Lock()
+	defer m.Unlock()
+
+	conn, ok := m.rawConn[node]
+	if ok {
+		conn.Close()
+	}
+
+	delete(m.remote, node)
+	delete(m.protoConn, node)
+	delete(m.rawConn, node)
+
+	m.recomputeGlobal()
+	m.recomputeNeed()
+}
+
+// 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 uint64, size uint32, hash []byte) ([]byte, error) {
+	// Verify that the requested file exists in the local and global model.
+	m.RLock()
+	lf, localOk := m.local[name]
+	_, globalOk := m.global[name]
+	m.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, int64(offset))
+	if err != nil {
+		return nil, err
+	}
+
+	return buf, nil
+}
+
+// ReplaceLocal replaces the local repository index with the given list of files.
+// Change suppression is applied to files changing too often.
+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.Equals(f) {
+			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()
+	}
+}
+
+// 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.Lock()
+	defer m.Unlock()
+
+	m.local = make(map[string]File)
+	for _, f := range fs {
+		m.local[f.Name] = fileFromFileInfo(f)
+	}
+
+	m.recomputeGlobal()
+	m.recomputeNeed()
+}
+
+// ConnectedTo returns true if we are connected to the named node.
+func (m *Model) ConnectedTo(nodeID string) bool {
+	m.RLock()
+	defer m.RUnlock()
+	_, ok := m.protoConn[nodeID]
+	return ok
+}
+
+// ProtocolIndex returns the current local index in protocol data types.
+func (m *Model) ProtocolIndex() []protocol.FileInfo {
+	m.RLock()
+	defer m.RUnlock()
+	return m.protocolIndex()
+}
+
+// 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.Lock()
+	m.protoConn[nodeID] = protoConn
+	m.rawConn[nodeID] = rawConn
+	m.Unlock()
+
+	m.RLock()
+	idx := m.protocolIndex()
+	m.RUnlock()
+
+	go func() {
+		protoConn.Index(idx)
+	}()
+}
+
+func (m *Model) shouldSuppressChange(name string) bool {
+	sup := shouldSuppressChange(m.fileLastChanged[name], m.fileWasSuppressed[name])
+	if sup {
+		m.fileWasSuppressed[name]++
+	} else {
+		m.fileWasSuppressed[name] = 0
+		m.fileLastChanged[name] = time.Now()
+	}
+	return sup
+}
+
+func shouldSuppressChange(lastChange time.Time, numChanges int) bool {
+	sinceLast := time.Since(lastChange)
+	if sinceLast > maxFileHoldTimeS*time.Second {
+		return false
+	}
+	if sinceLast < time.Duration((numChanges+2)*minFileHoldTimeS)*time.Second {
+		return true
+	}
+	return false
+}
+
+// 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
+	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)
+	}
+	return index
+}
+
+func (m *Model) requestGlobal(nodeID, name string, offset uint64, size uint32, hash []byte) ([]byte, error) {
+	m.RLock()
+	nc, ok := m.protoConn[nodeID]
+	m.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.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.protoConn))
+			idx := m.protocolIndex()
+			m.lastIdxBcast = time.Now()
+			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.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.NewerThan(f) {
+				if f.Flags&protocol.FlagDeleted == 0 {
+					f.Flags = protocol.FlagDeleted
+					f.Version++
+					f.Blocks = nil
+					updated = true
+				}
+				newLocal[n] = f
+			}
+		}
+	}
+	return updated
+}
+
+func (m *Model) updateLocal(f File) {
+	if ef, ok := m.local[f.Name]; !ok || !ef.Equals(f) {
+		m.local[f.Name] = f
+		m.recomputeGlobal()
+		m.recomputeNeed()
+		m.updatedLocal = time.Now().Unix()
+		m.lastIdxBcastRequest = time.Now()
+	}
+}
+
+// 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
+	}
+
+	var highestMod int64
+	for _, fs := range m.remote {
+		for n, nf := range fs {
+			if lf, ok := newGlobal[n]; !ok || nf.NewerThan(lf) {
+				newGlobal[n] = nf
+				if nf.Modified > highestMod {
+					highestMod = nf.Modified
+				}
+			}
+		}
+	}
+
+	// Figure out if anything actually changed
+
+	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
+			}
+		}
+	}
+
+	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, gf := range m.global {
+		lf, ok := m.local[n]
+		if !ok || gf.NewerThan(lf) {
+			if gf.Flags&protocol.FlagInvalid != 0 {
+				// Never attempt to sync invalid files
+				continue
+			}
+			if gf.Flags&protocol.FlagDeleted != 0 && !m.delete {
+				// Don't want to delete files, so forget this need
+				continue
+			}
+			if gf.Flags&protocol.FlagDeleted != 0 && !ok {
+				// Don't have the file, so don't need to delete it
+				continue
+			}
+			if m.trace["need"] {
+				log.Println("NEED:", ok, lf, gf)
+			}
+			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.Equals(gf) {
+			remote = append(remote, node)
+		}
+	}
+
+	return remote
+}
+
+func fileFromFileInfo(f protocol.FileInfo) File {
+	var blocks = make([]Block, len(f.Blocks))
+	var offset uint64
+	for i, b := range f.Blocks {
+		blocks[i] = 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),
+		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{
+			Length: b.Length,
+			Hash:   b.Hash,
+		}
+	}
+	return protocol.FileInfo{
+		Name:     f.Name,
+		Flags:    f.Flags,
+		Modified: int64(f.Modified),
+		Version:  f.Version,
+		Blocks:   blocks,
+	}
+}

model/model_puller.go

@@ -1,4 +1,4 @@
-package main
+package model
 
 /*
 
@@ -18,20 +18,27 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"log"
 	"os"
 	"path"
 	"sync"
 	"time"
 
 	"github.com/calmh/syncthing/buffers"
+	"github.com/calmh/syncthing/protocol"
 )
 
 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)
 
@@ -45,17 +52,17 @@ func (m *Model) pullFile(name string) error {
 	if err != nil {
 		return err
 	}
-	defer tmpFile.Close()
 
 	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)
+	local, remote := BlockDiff(localFile.Blocks, globalFile.Blocks)
 	var fetchDone sync.WaitGroup
 
 	// One local copy routine
@@ -77,11 +84,8 @@ func (m *Model) pullFile(name string) error {
 
 	// N remote copy routines
 
-	m.RLock()
-	var nodeIDs = m.whoHas(name)
-	m.RUnlock()
 	var remoteBlocks = blockIterator{blocks: remote}
-	for i := 0; i < opts.Advanced.RequestsInFlight; i++ {
+	for i := 0; i < m.paralllelReqs; i++ {
 		curNode := nodeIDs[i%len(nodeIDs)]
 		fetchDone.Add(1)
 
@@ -91,7 +95,7 @@ func (m *Model) pullFile(name string) error {
 				if !ok {
 					break
 				}
-				data, err := m.RequestGlobal(nodeID, name, block.Offset, block.Length, block.Hash)
+				data, err := m.requestGlobal(nodeID, name, block.Offset, block.Length, block.Hash)
 				if err != nil {
 					break
 				}
@@ -110,7 +114,7 @@ func (m *Model) pullFile(name string) error {
 
 	err = hashCheck(tmpFilename, globalFile.Blocks)
 	if err != nil {
-		return fmt.Errorf("%s: %s", path.Base(name), err.Error())
+		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))
@@ -118,6 +122,11 @@ func (m *Model) pullFile(name string) error {
 		return err
 	}
 
+	err = os.Chmod(tmpFilename, os.FileMode(globalFile.Flags&0777))
+	if err != nil {
+		return err
+	}
+
 	err = os.Rename(tmpFilename, filename)
 	if err != nil {
 		return err
@@ -127,7 +136,6 @@ func (m *Model) pullFile(name string) error {
 }
 
 func (m *Model) puller() {
-
 	for {
 		time.Sleep(time.Second)
 
@@ -142,41 +150,49 @@ func (m *Model) puller() {
 			continue
 		}
 
-		var limiter = make(chan bool, opts.Advanced.FilesInFlight)
+		var limiter = make(chan bool, m.parallellFiles)
+		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)
+				m.RLock()
+				f, ok := m.global[n]
+				m.RUnlock()
+
 				if !ok {
 					return
 				}
 
 				var err error
-				if f.Flags&FlagDeleted == 0 {
-					if opts.Debug.TraceFile {
-						debugf("FILE: Pull %q", n)
+				if f.Flags&protocol.FlagDeleted == 0 {
+					if m.trace["file"] {
+						log.Printf("FILE: Pull %q", n)
 					}
 					err = m.pullFile(n)
 				} else {
-					if opts.Debug.TraceFile {
-						debugf("FILE: Remove %q", n)
+					if m.trace["file"] {
+						log.Printf("FILE: Remove %q", n)
 					}
 					// Cheerfully ignore errors here
 					_ = os.Remove(path.Join(m.dir, n))
 				}
 				if err == nil {
-					m.UpdateLocal(f)
-				} else {
-					warnln(err)
+					m.Lock()
+					m.updateLocal(f)
+					m.Unlock()
 				}
 			}(n)
 		}
+
+		allDone.Wait()
 	}
 }
 
@@ -190,10 +206,10 @@ func applyContent(cc <-chan content, dst io.WriterAt) error {
 
 	for c := range cc {
 		_, err = dst.WriteAt(c.data, c.offset)
+		buffers.Put(c.data)
 		if err != nil {
 			return err
 		}
-		buffers.Put(c.data)
 	}
 
 	return nil

model/model_test.go

@@ -1,6 +1,9 @@
-package main
+package model
 
 import (
+	"bytes"
+	"fmt"
+	"os"
 	"reflect"
 	"testing"
 	"time"
@@ -27,27 +30,31 @@ func TestNewModel(t *testing.T) {
 var testDataExpected = map[string]File{
 	"foo": File{
 		Name:     "foo",
-		Flags:    0644,
-		Modified: 1384244572,
+		Flags:    0,
+		Modified: 0,
 		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,
+		Flags:    0,
+		Modified: 0,
 		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 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("foo")
-	fs := Walk("testdata", m, false)
+	m := NewModel("testdata")
+	fs, _ := m.Walk(false)
 	m.ReplaceLocal(fs)
 
 	if len(m.need) > 0 {
@@ -88,8 +95,8 @@ func TestUpdateLocal(t *testing.T) {
 }
 
 func TestRemoteUpdateExisting(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
+	m := NewModel("testdata")
+	fs, _ := m.Walk(false)
 	m.ReplaceLocal(fs)
 
 	newFile := protocol.FileInfo{
@@ -105,8 +112,8 @@ func TestRemoteUpdateExisting(t *testing.T) {
 }
 
 func TestRemoteAddNew(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
+	m := NewModel("testdata")
+	fs, _ := m.Walk(false)
 	m.ReplaceLocal(fs)
 
 	newFile := protocol.FileInfo{
@@ -122,8 +129,8 @@ func TestRemoteAddNew(t *testing.T) {
 }
 
 func TestRemoteUpdateOld(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
+	m := NewModel("testdata")
+	fs, _ := m.Walk(false)
 	m.ReplaceLocal(fs)
 
 	oldTimeStamp := int64(1234)
@@ -140,8 +147,8 @@ func TestRemoteUpdateOld(t *testing.T) {
 }
 
 func TestRemoteIndexUpdate(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
+	m := NewModel("testdata")
+	fs, _ := m.Walk(false)
 	m.ReplaceLocal(fs)
 
 	foo := protocol.FileInfo{
@@ -173,8 +180,8 @@ func TestRemoteIndexUpdate(t *testing.T) {
 }
 
 func TestDelete(t *testing.T) {
-	m := NewModel("foo")
-	fs := Walk("testdata", m, false)
+	m := NewModel("testdata")
+	fs, _ := m.Walk(false)
 	m.ReplaceLocal(fs)
 
 	if l1, l2 := len(m.local), len(fs); l1 != l2 {
@@ -190,7 +197,7 @@ func TestDelete(t *testing.T) {
 		Modified: ot,
 		Blocks:   []Block{{0, 100, []byte("some hash bytes")}},
 	}
-	m.UpdateLocal(newFile)
+	m.updateLocal(newFile)
 
 	if l1, l2 := len(m.local), len(fs)+1; l1 != l2 {
 		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
@@ -216,9 +223,12 @@ func TestDelete(t *testing.T) {
 	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 {
+	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")
@@ -226,8 +236,11 @@ func TestDelete(t *testing.T) {
 	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)
+	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
@@ -247,8 +260,11 @@ func TestDelete(t *testing.T) {
 	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 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 {
@@ -257,14 +273,17 @@ func TestDelete(t *testing.T) {
 	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)
+	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("foo")
-	fs := Walk("testdata", m, false)
+	m := NewModel("testdata")
+	fs, _ := m.Walk(false)
 	m.ReplaceLocal(fs)
 
 	if l1, l2 := len(m.local), len(fs); l1 != l2 {
@@ -294,7 +313,7 @@ func TestForgetNode(t *testing.T) {
 		t.Errorf("Model len(need) incorrect (%d != %d)", l1, l2)
 	}
 
-	m.Close("42")
+	m.Close("42", nil)
 
 	if l1, l2 := len(m.local), len(fs); l1 != l2 {
 		t.Errorf("Model len(local) incorrect (%d != %d)", l1, l2)
@@ -306,3 +325,189 @@ func TestForgetNode(t *testing.T) {
 		t.Errorf("Model len(need) incorrect (%d != %d)", l1, l2)
 	}
 }
+
+func TestRequest(t *testing.T) {
+	m := NewModel("testdata")
+	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 TestSuppression(t *testing.T) {
+	var testdata = []struct {
+		lastChange time.Time
+		hold       int
+		result     bool
+	}{
+		{time.Unix(0, 0), 0, false},                    // First change
+		{time.Now().Add(-1 * time.Second), 0, true},    // Changed once one second ago, suppress
+		{time.Now().Add(-119 * time.Second), 0, true},  // Changed once 119 seconds ago, suppress
+		{time.Now().Add(-121 * time.Second), 0, false}, // Changed once 121 seconds ago, permit
+
+		{time.Now().Add(-179 * time.Second), 1, true},  // Suppressed once 179 seconds ago, suppress again
+		{time.Now().Add(-181 * time.Second), 1, false}, // Suppressed once 181 seconds ago, permit
+
+		{time.Now().Add(-599 * time.Second), 99, true},  // Suppressed lots of times, last allowed 599 seconds ago, suppress again
+		{time.Now().Add(-601 * time.Second), 99, false}, // Suppressed lots of times, last allowed 601 seconds ago, permit
+	}
+
+	for i, tc := range testdata {
+		if shouldSuppressChange(tc.lastChange, tc.hold) != tc.result {
+			t.Errorf("Incorrect result for test #%d: %v", i, tc)
+		}
+	}
+}
+
+func TestIgnoreWithUnknownFlags(t *testing.T) {
+	m := NewModel("testdata")
+	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 prepareModel(n int, m *Model) []protocol.FileInfo {
+	fs, _ := m.Walk(false)
+	m.ReplaceLocal(fs)
+
+	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")}},
+		}
+	}
+
+	m.Index("42", files)
+	return files
+}
+
+func BenchmarkRecomputeGlobal10k(b *testing.B) {
+	m := NewModel("testdata")
+	prepareModel(10000, m)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.recomputeGlobal()
+	}
+}
+
+func BenchmarkRecomputeNeed10K(b *testing.B) {
+	m := NewModel("testdata")
+	prepareModel(10000, m)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.recomputeNeed()
+	}
+}
+
+func BenchmarkIndexUpdate10000(b *testing.B) {
+	m := NewModel("testdata")
+	files := prepareModel(10000, m)
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		m.IndexUpdate("42", files)
+	}
+}
+
+type FakeConnection struct {
+	id          string
+	requestData []byte
+}
+
+func (FakeConnection) Close() error {
+	return nil
+}
+
+func (f FakeConnection) ID() string {
+	return string(f.id)
+}
+
+func (FakeConnection) Index([]protocol.FileInfo) {}
+
+func (f FakeConnection) Request(name string, offset uint64, 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")
+	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/testdata/.stignore

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

model/walk.go

@@ -0,0 +1,246 @@
+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.Length)
+	}
+	return
+}
+
+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 {
+			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 {
+			fi, err := os.Stat(p)
+			if err != nil {
+				return nil
+			}
+			modified := fi.ModTime().Unix()
+
+			m.RLock()
+			hf, ok := m.local[rn]
+			m.RUnlock()
+
+			if ok && hf.Modified == modified {
+				if nf := uint32(info.Mode()); nf != hf.Flags {
+					hf.Flags = nf
+					hf.Version++
+				}
+				*res = append(*res, hf)
+			} else {
+				m.Lock()
+				if m.shouldSuppressChange(rn) {
+					if m.trace["file"] {
+						log.Println("FILE: SUPPRESS:", rn, m.fileWasSuppressed[rn], time.Since(m.fileLastChanged[rn]))
+					}
+
+					if ok {
+						hf.Flags = protocol.FlagInvalid
+						hf.Version++
+						*res = append(*res, hf)
+					}
+					m.Unlock()
+					return nil
+				}
+				m.Unlock()
+
+				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 _, fi := range fis {
+			if fi.Mode()&os.ModeSymlink != 0 {
+				dir := path.Join(m.dir, fi.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 ignoreFilter(patterns map[string][]string, files []File) (filtered []File) {
+	for _, f := range files {
+		if !ignoreFile(patterns, f.Name) {
+			filtered = append(filtered, f)
+		}
+	}
+	return filtered
+}
+
+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 +1,86 @@
+package model
+
+import (
+	"fmt"
+	"reflect"
+	"testing"
+	"time"
+)
+
+var testdata = []struct {
+	name string
+	size int
+	hash string
+}{
+	{"bar", 10, "2f72cc11a6fcd0271ecef8c61056ee1eb1243be3805bf9a9df98f92f7636b05c"},
+	{"foo", 7, "aec070645fe53ee3b3763059376134f058cc337247c978add178b6ccdfb0019f"},
+}
+
+var correctIgnores = map[string][]string{
+	"": {".*", "quux"},
+}
+
+func TestWalk(t *testing.T) {
+	m := NewModel("testdata")
+	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 files = []File{
+		{Name: "foo/bar"},
+		{Name: "foo/quux"},
+		{Name: "foo/zuux"},
+		{Name: "foo/qzuux"},
+		{Name: "foo/baz/t1"},
+		{Name: "foo/baz/t2"},
+		{Name: "foo/baz/bar"},
+		{Name: "foo/baz/quuxa"},
+		{Name: "foo/baz/aquux"},
+		{Name: "foo/baz/.quux"},
+		{Name: "foo/baz/zquux"},
+		{Name: "foo/baz/quux"},
+		{Name: "foo/bazz/quux"},
+	}
+	var remaining = []File{
+		{Name: "foo/quux"},
+		{Name: "foo/qzuux"},
+		{Name: "foo/baz/t1"},
+		{Name: "foo/baz/quuxa"},
+		{Name: "foo/baz/aquux"},
+		{Name: "foo/bazz/quux"},
+	}
+
+	var filtered = ignoreFilter(patterns, files)
+	if !reflect.DeepEqual(filtered, remaining) {
+		t.Errorf("Filtering mismatch\n  %v\n  %v", remaining, filtered)
+	}
+}

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)

protocol/common_test.go

@@ -25,7 +25,7 @@ func (t *TestModel) Request(nodeID, name string, offset uint64, size uint32, has
 	return t.data, nil
 }
 
-func (t *TestModel) Close(nodeID string) {
+func (t *TestModel) Close(nodeID string, err error) {
 	t.closed = true
 }
 

protocol/messages.go

@@ -39,6 +39,7 @@ 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)
@@ -77,6 +78,7 @@ 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 {

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")},
@@ -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")},

protocol/protocol.go

@@ -3,8 +3,8 @@ package protocol
 import (
 	"compress/flate"
 	"errors"
+	"fmt"
 	"io"
-	"log"
 	"sync"
 	"time"
 
@@ -20,10 +20,16 @@ const (
 	messageTypeIndexUpdate = 6
 )
 
+const (
+	FlagDeleted = 1 << 12
+	FlagInvalid = 1 << 13
+)
+
 type FileInfo struct {
 	Name     string
 	Flags    uint32
 	Modified int64
+	Version  uint32
 	Blocks   []BlockInfo
 }
 
@@ -40,29 +46,27 @@ type Model interface {
 	// A request was made by the peer node
 	Request(nodeID, name string, offset uint64, size uint32, hash []byte) ([]byte, error)
 	// The peer node closed the connection
-	Close(nodeID string)
+	Close(nodeID string, err error)
 }
 
 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
-	peerLatency time.Duration
-	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
+
+	hasSentIndex  bool
+	hasRecvdIndex bool
 
-	lastStatistics Statistics
 	statisticsLock sync.Mutex
-
-	lastReceive     time.Time
-	lastReceiveLock sync.RWMutex
 }
 
 var ErrClosed = errors.New("Connection closed")
@@ -72,8 +76,10 @@ type asyncResult struct {
 	err error
 }
 
-const pingTimeout = 30 * time.Second
-const pingIdleTime = 5 * time.Minute
+const (
+	pingTimeout  = 2 * time.Minute
+	pingIdleTime = 5 * time.Minute
+)
 
 func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver Model) *Connection {
 	flrd := flate.NewReader(reader)
@@ -83,15 +89,13 @@ 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),
-		lastReceive:    time.Now(),
-		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()
@@ -100,27 +104,30 @@ func NewConnection(nodeID string, reader io.Reader, writer io.Writer, receiver M
 	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()
-
 	var msgType int
 	if c.indexSent == nil {
 		// 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
@@ -130,32 +137,38 @@ func (c *Connection) Index(idx []FileInfo) {
 	c.mwriter.writeIndex(idx)
 	err := c.flush()
 	c.nextId = (c.nextId + 1) & 0xfff
+	c.hasSentIndex = true
 	c.Unlock()
-	if err != nil || c.mwriter.err != nil {
-		c.close()
+
+	if err != nil {
+		c.close(err)
+		return
+	} else if c.mwriter.err != nil {
+		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) {
-	if c.isClosed() {
+	c.Lock()
+	if c.closed {
+		c.Unlock()
 		return nil, ErrClosed
 	}
-	c.Lock()
 	rc := make(chan asyncResult)
 	c.awaiting[c.nextId] = rc
 	c.mwriter.writeHeader(header{0, c.nextId, messageTypeRequest})
 	c.mwriter.writeRequest(request{name, offset, size, hash})
 	if c.mwriter.err != nil {
 		c.Unlock()
-		c.close()
+		c.close(c.mwriter.err)
 		return nil, c.mwriter.err
 	}
 	err := c.flush()
 	if err != nil {
 		c.Unlock()
-		c.close()
+		c.close(err)
 		return nil, err
 	}
 	c.nextId = (c.nextId + 1) & 0xfff
@@ -168,29 +181,30 @@ func (c *Connection) Request(name string, offset uint64, size uint32, hash []byt
 	return res.val, res.err
 }
 
-func (c *Connection) Ping() (time.Duration, bool) {
-	if c.isClosed() {
-		return 0, false
-	}
+func (c *Connection) ping() bool {
 	c.Lock()
-	rc := make(chan asyncResult)
+	if c.closed {
+		c.Unlock()
+		return false
+	}
+	rc := make(chan asyncResult, 1)
 	c.awaiting[c.nextId] = rc
-	t0 := time.Now()
 	c.mwriter.writeHeader(header{0, c.nextId, messageTypePing})
 	err := c.flush()
-	if err != nil || c.mwriter.err != nil {
+	if err != nil {
 		c.Unlock()
-		c.close()
-		return 0, false
+		c.close(err)
+		return false
+	} else if c.mwriter.err != nil {
+		c.Unlock()
+		c.close(c.mwriter.err)
+		return false
 	}
 	c.nextId = (c.nextId + 1) & 0xfff
 	c.Unlock()
 
-	_, ok := <-rc
-	return time.Since(t0), ok
-}
-
-func (c *Connection) Stop() {
+	res, ok := <-rc
+	return ok && res.err == nil
 }
 
 type flusher interface {
@@ -204,7 +218,7 @@ func (c *Connection) flush() error {
 	return nil
 }
 
-func (c *Connection) close() {
+func (c *Connection) close(err error) {
 	c.Lock()
 	if c.closed {
 		c.Unlock()
@@ -217,7 +231,7 @@ func (c *Connection) close() {
 	c.awaiting = nil
 	c.Unlock()
 
-	c.receiver.Close(c.ID)
+	c.receiver.Close(c.id, err)
 }
 
 func (c *Connection) isClosed() bool {
@@ -227,59 +241,63 @@ func (c *Connection) isClosed() bool {
 }
 
 func (c *Connection) readerLoop() {
-	for !c.isClosed() {
+loop:
+	for {
 		hdr := c.mreader.readHeader()
 		if c.mreader.err != nil {
-			c.close()
-			break
+			c.close(c.mreader.err)
+			break loop
 		}
 		if hdr.version != 0 {
-			log.Printf("Protocol error: %s: unknown message version %#x", c.ID, hdr.version)
-			c.close()
-			break
+			c.close(fmt.Errorf("Protocol error: %s: unknown message version %#x", c.ID, hdr.version))
+			break loop
 		}
 
-		c.lastReceiveLock.Lock()
-		c.lastReceive = time.Now()
-		c.lastReceiveLock.Unlock()
-
 		switch hdr.msgType {
 		case messageTypeIndex:
 			files := c.mreader.readIndex()
 			if c.mreader.err != nil {
-				c.close()
+				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
+			c.Unlock()
 
 		case messageTypeIndexUpdate:
 			files := c.mreader.readIndex()
 			if c.mreader.err != nil {
-				c.close()
+				c.close(c.mreader.err)
+				break loop
 			} else {
-				c.receiver.IndexUpdate(c.ID, files)
+				c.receiver.IndexUpdate(c.id, files)
 			}
 
 		case messageTypeRequest:
-			c.processRequest(hdr.msgID)
+			req := c.mreader.readRequest()
+			if c.mreader.err != nil {
+				c.close(c.mreader.err)
+				break loop
+			}
+			go c.processRequest(hdr.msgID, req)
 
 		case messageTypeResponse:
 			data := c.mreader.readResponse()
 
 			if c.mreader.err != nil {
-				c.close()
+				c.close(c.mreader.err)
+				break loop
 			} else {
-				c.RLock()
+				c.Lock()
 				rc, ok := c.awaiting[hdr.msgID]
-				c.RUnlock()
+				delete(c.awaiting, hdr.msgID)
+				c.Unlock()
 
 				if ok {
 					rc <- asyncResult{data, c.mreader.err}
 					close(rc)
-
-					c.Lock()
-					delete(c.awaiting, hdr.msgID)
-					c.Unlock()
 				}
 			}
 
@@ -288,8 +306,12 @@ func (c *Connection) readerLoop() {
 			c.mwriter.writeUint32(encodeHeader(header{0, hdr.msgID, messageTypePong}))
 			err := c.flush()
 			c.Unlock()
-			if err != nil || c.mwriter.err != nil {
-				c.close()
+			if err != nil {
+				c.close(err)
+				break loop
+			} else if c.mwriter.err != nil {
+				c.close(c.mwriter.err)
+				break loop
 			}
 
 		case messageTypePong:
@@ -307,83 +329,69 @@ func (c *Connection) readerLoop() {
 			}
 
 		default:
-			log.Printf("Protocol error: %s: unknown message type %#x", c.ID, hdr.msgType)
-			c.close()
+			c.close(fmt.Errorf("Protocol error: %s: unknown message type %#x", c.ID, hdr.msgType))
+			break loop
 		}
 	}
 }
 
-func (c *Connection) processRequest(msgID int) {
-	req := c.mreader.readRequest()
-	if c.mreader.err != nil {
-		c.close()
-	} else {
-		go func() {
-			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()
-			c.Unlock()
-			buffers.Put(data)
-			if c.mwriter.err != nil || err != nil {
-				c.close()
-			}
-		}()
+func (c *Connection) processRequest(msgID int, req request) {
+	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()
+	c.Unlock()
+
+	buffers.Put(data)
+	if err != nil {
+		c.close(err)
+	} else if c.mwriter.err != nil {
+		c.close(c.mwriter.err)
 	}
 }
 
 func (c *Connection) pingerLoop() {
-	var rc = make(chan time.Duration, 1)
-	for !c.isClosed() {
-		c.lastReceiveLock.RLock()
-		lr := c.lastReceive
-		c.lastReceiveLock.RUnlock()
+	var rc = make(chan bool, 1)
+	for {
+		time.Sleep(pingIdleTime / 2)
 
-		if time.Since(lr) > pingIdleTime {
+		c.RLock()
+		ready := c.hasRecvdIndex && c.hasSentIndex
+		c.RUnlock()
+
+		if ready {
 			go func() {
-				t, ok := c.Ping()
-				if ok {
-					rc <- t
-				}
+				rc <- c.ping()
 			}()
 			select {
-			case lat := <-rc:
-				c.Lock()
-				c.peerLatency = (c.peerLatency + lat) / 2
-				c.Unlock()
+			case ok := <-rc:
+				if !ok {
+					c.close(fmt.Errorf("Ping failure"))
+				}
 			case <-time.After(pingTimeout):
-				c.close()
+				c.close(fmt.Errorf("Ping timeout"))
 			}
 		}
-		time.Sleep(time.Second)
 	}
 }
 
 type Statistics struct {
-	At             time.Time
-	InBytesTotal   int
-	InBytesPerSec  int
-	OutBytesTotal  int
-	OutBytesPerSec int
-	Latency        time.Duration
+	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),
-		Latency:        c.peerLatency,
+		At:            time.Now(),
+		InBytesTotal:  int(c.mreader.getTot()),
+		OutBytesTotal: int(c.mwriter.getTot()),
 	}
-	c.lastStatistics = stats
+
 	return stats
 }

protocol/protocol_test.go

@@ -46,10 +46,10 @@ func TestPing(t *testing.T) {
 	c0 := NewConnection("c0", ar, bw, nil)
 	c1 := NewConnection("c1", br, aw, 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")
 	}
 }
@@ -70,7 +70,7 @@ func TestPingErr(t *testing.T) {
 			c0 := NewConnection("c0", ar, ebw, m0)
 			NewConnection("c1", br, eaw, m1)
 
-			_, 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 {
@@ -190,7 +190,7 @@ func TestClose(t *testing.T) {
 	c0 := NewConnection("c0", ar, bw, m0)
 	NewConnection("c1", br, aw, m1)
 
-	c0.close()
+	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("wrote cert.pem")
+	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("wrote key.pem")
+	okln("Created RSA key file")
 }

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

@@ -1,147 +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 {
-			return err
-		}
-
-		if isTempName(p) {
-			return nil
-		}
-
-		if info.Mode()&os.ModeType == 0 {
-			rn, err := filepath.Rel(base, p)
-			if err != nil {
-				return err
-			}
-
-			fi, err := os.Stat(p)
-			if err != nil {
-				return err
-			}
-			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 {
-					return err
-				}
-				defer fd.Close()
-
-				blocks, err := Blocks(fd, BlockSize)
-				if err != nil {
-					return err
-				}
-				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
-		}
-		fis, err := d.Readdir(-1)
-		if err != nil {
-			warnln(err)
-			return files
-		}
-		d.Close()
-		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)
-		}
-	}
-}