From 8807a2abaf0825322200501348dfc3795e2589ff Mon Sep 17 00:00:00 2001
From: Julian Sparber <julian@sparber.net>
Date: Thu, 31 Mar 2022 14:37:38 +0200
Subject: [PATCH] Add example to print the room history

---
 crates/matrix-sdk/examples/timeline.rs | 107 +++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 crates/matrix-sdk/examples/timeline.rs

diff --git a/crates/matrix-sdk/examples/timeline.rs b/crates/matrix-sdk/examples/timeline.rs
new file mode 100644
index 000000000..663b01b2d
--- /dev/null
+++ b/crates/matrix-sdk/examples/timeline.rs
@@ -0,0 +1,107 @@
+use std::{env, process::exit, sync::Mutex, time::Duration};
+
+use futures::{pin_mut, StreamExt};
+use matrix_sdk::{
+    self,
+    config::SyncSettings,
+    room::Room,
+    ruma::{
+        api::client::filter::{FilterDefinition, LazyLoadOptions, RoomEventFilter, RoomFilter},
+        assign,
+        events::{AnyMessageLikeEventContent, AnySyncRoomEvent},
+    },
+    store::make_store_config,
+    Client, LoopCtrl,
+};
+use tokio::sync::oneshot;
+use url::Url;
+
+async fn login(homeserver_url: String, username: &str, password: &str) -> Client {
+    let homeserver_url = Url::parse(&homeserver_url).expect("Couldn't parse the homeserver URL");
+    let path = "./";
+    let store_config = make_store_config(path, Some("some password")).unwrap();
+    let client = Client::builder()
+        .homeserver_url(homeserver_url)
+        .store_config(store_config)
+        .build()
+        .await
+        .unwrap();
+
+    client.login(username, password, None, Some("rust-sdk")).await.unwrap();
+    client
+}
+
+fn event_content(event: AnySyncRoomEvent) -> Option<String> {
+    if let AnySyncRoomEvent::MessageLike(event) = event {
+        if let AnyMessageLikeEventContent::RoomMessage(content) = event.content() {
+            return Some(content.msgtype.body().to_owned());
+        }
+    }
+    None
+}
+async fn print_timeline(room: Room) {
+    let backward_stream = room.timeline_backward().await.unwrap();
+
+    pin_mut!(backward_stream);
+
+    while let Some(event) = backward_stream.next().await {
+        let event = event.unwrap();
+        if let Some(content) = event_content(event.event.deserialize().unwrap()) {
+            println!("{}", content);
+        }
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), matrix_sdk::Error> {
+    tracing_subscriber::fmt::init();
+
+    let (homeserver_url, username, password, room_id) =
+        match (env::args().nth(1), env::args().nth(2), env::args().nth(3), env::args().nth(4)) {
+            (Some(a), Some(b), Some(c), Some(d)) => (a, b, c, d),
+            _ => {
+                eprintln!(
+                    "Usage: {} <homeserver_url> <username> <password> <room_id>",
+                    env::args().next().unwrap()
+                );
+                exit(1)
+            }
+        };
+
+    let client = login(homeserver_url, &username, &password).await;
+
+    let room_event_filter = assign!(RoomEventFilter::default(), {
+        lazy_load_options: LazyLoadOptions::Enabled {include_redundant_members: false},
+    });
+    let filter = assign!(FilterDefinition::default(), {
+        room: assign!(RoomFilter::empty(), {
+            include_leave: true,
+            state: room_event_filter,
+        }),
+    });
+
+    let sync_settings = SyncSettings::new().timeout(Duration::from_secs(30)).filter(filter.into());
+    let (sender, receiver) = oneshot::channel::<()>();
+    let sender = Mutex::new(Some(sender));
+    let client_clone = client.clone();
+    tokio::spawn(async move {
+        client_clone
+            .sync_with_callback(sync_settings, |_| async {
+                if let Some(sender) = sender.lock().unwrap().take() {
+                    sender.send(()).unwrap();
+                }
+                LoopCtrl::Continue
+            })
+            .await;
+    });
+
+    // Wait for the first sync response
+    println!("Wait for the first sync");
+    receiver.await.unwrap();
+
+    let room = client.get_room(room_id.as_str().try_into().unwrap()).unwrap();
+
+    print_timeline(room).await;
+
+    Ok(())
+}