matrix: Rework room send error handling

* Use the tracing crate instead of println macros
 * Do not panic on failure to send messages
 * Move the send code to a separate function in preparation for adding
   a proper retry implementation

Cargo.lock

@@ -1295,7 +1295,7 @@ checksum = "3e2e65a1a2e43cfcb47a895c4c8b10d1f4a61097f9f254f183aee60cad9c651d"
 
 [[package]]
 name = "matrix-feedbot"
-version = "0.1.0"
+version = "0.1.2"
 dependencies = [
  "anyhow",
  "chrono",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "matrix-feedbot"
-version = "0.1.1"
+version = "0.1.3"
 edition = "2021"
 license = "GPL-3.0-or-later"
 authors = ["mirsal <mirsal@mirsal.fr>"]

src/matrix.rs

@@ -33,6 +33,7 @@ use tokio::{
 };
 
 use tracing::{error, info};
+use std::error::Error;
 
 async fn on_stripped_state_member(
     room_member: StrippedRoomMemberEvent,
@@ -44,27 +45,46 @@ async fn on_stripped_state_member(
     }
 
     tokio::spawn(async move {
-        println!("Autojoining room {}", room.room_id());
+        info!("Autojoining room {}", room.room_id());
         let mut delay = 2;
 
         while let Err(err) = room.join().await {
             // retry autojoin due to synapse sending invites, before the
             // invited user can join for more information see
             // https://github.com/matrix-org/synapse/issues/4345
-            eprintln!("Failed to join room {} ({err:?}), retrying in {delay}s", room.room_id());
+            error!("Failed to join room {} ({err:?}), retrying in {delay}s", room.room_id());
 
             sleep(Duration::from_secs(delay)).await;
             delay *= 2;
 
             if delay > 3600 {
-                eprintln!("Can't join room {} ({err:?})", room.room_id());
+                error!("Can't join room {} ({err:?})", room.room_id());
                 break;
             }
         }
-        println!("Successfully joined room {}", room.room_id());
+        info!("Successfully joined room {}", room.room_id());
     });
 }
 
+async fn send_to_room(
+    msg: &String,
+    room: Room,
+) -> Result<(), Box<dyn Error>> {
+
+    info!("Joining room {}", room.room_id());
+    match room.client().join_room_by_id(room.room_id()).await {
+        Ok(_) => {
+            info!("Posting to room {}", room.room_id());
+            room.send(RoomMessageEventContent::text_html(msg.clone(), msg)).await?;
+            return Ok(());
+        },
+        Err(e) => {
+            error!("Failed to join room {e:?}");
+            return Err(e.into());
+        }
+    };
+}
+
 pub async fn login_and_sync<T: Clone>(
     homeserver_url: String,
     username: &str,
@@ -78,10 +98,10 @@ pub async fn login_and_sync<T: Clone>(
     client
         .matrix_auth()
         .login_username(username, password)
-        .initial_device_display_name("bender v0.1.0")
+        .initial_device_display_name("bender v0.1.3")
         .await?;
 
-    println!("logged in as {username}");
+    info!("logged in as {username}");
 
     client.add_event_handler(on_stripped_state_member);
 
@@ -110,14 +130,16 @@ pub async fn login_and_sync<T: Clone>(
 
                     let msg = &msg.clone();
                     for r in rooms {
-                        info!("Joining room {}", r);
-                        let room = client.join_room_by_id(<&RoomId>::try_from(r.as_str())
-                            .expect("invalid room ID")
-                        ).await.expect(format!("Failed to join room {}", r).as_str());
+                        match client.get_room(<&RoomId>::try_from(r.as_str())
+                            .expect(format!("Invalid Room ID: {}", r).as_str())) {
 
-                        info!("Posting to room {}", r);
-                        room.send(RoomMessageEventContent::text_html(msg.clone(), msg)).await
-                            .expect("Failed to send matrix event");
+                            Some(room) => match send_to_room(msg, room).await {
+                                Ok(_)  => info!("Done sending to room {}", r),
+                                Err(e) => error!("Cannot send to room {}: {e:?}", r),
+                            },
+
+                            None => error!("Room {} not found in matrix state store", r)
+                        };
                     }
                 },
                 Err(e) => {