feature (status - rooms): Implemented a timeline event caching layer

src/app/mod.rs

@@ -139,6 +139,13 @@ impl App<'_> {
         self.status.set_account_name(name);
         self.status.set_account_user_id(user_id);
 
+
+        for room in self.status.rooms_mut() {
+            room.poll_old_timeline().await?;
+            room.poll_old_timeline().await?;
+            room.poll_old_timeline().await?;
+        }
+
         info!("Initializing client for the current account");
 
         Ok(())

src/app/status.rs

@@ -1,5 +1,9 @@
-use matrix_sdk::Client;
-use matrix_sdk::ruma::{room_id, RoomId, ServerName};
+use matrix_sdk::{Client,
+                 ruma::{events::{AnyTimelineEvent}},
+                 deserialized_responses::TimelineEvent,
+                 room::MessagesOptions};
+use anyhow::{Result, Error};
+use cli_log::{error, warn, info};
 
 pub enum State {
     None,
@@ -7,20 +11,70 @@ pub enum State {
     Setup,
 }
 
+pub struct Room {
+    matrix_room: matrix_sdk::room::Joined,
+    timeline: Vec<AnyTimelineEvent>,
+    timeline_end: Option<String>,
+}
+
 pub struct Status {
     state: State,
     account_name: String,
     account_user_id: String,
 
     client: Option<Client>,
-    rooms: Vec<matrix_sdk::room::Joined>,
+    rooms: Vec<Room>,
     current_room_id: Option<u32>,
 }
 
+impl Room {
+    pub fn new (matrix_room: matrix_sdk::room::Joined) -> Self {
+        Self {
+            matrix_room,
+            timeline: Vec::new(),
+            timeline_end: None,
+        }
+    }
+
+    pub async fn poll_old_timeline(&mut self) -> Result<()> {
+        let mut messages_options = MessagesOptions::backward();
+        messages_options = match &self.timeline_end {
+            Some(end) => messages_options.from(end.as_str()),
+            None => messages_options
+        };
+        let events = self.matrix_room.messages(messages_options).await?;
+        self.timeline_end = events.end;
+
+        for event in events.chunk.iter() {
+            self.timeline.insert(0, match event.event.deserialize() {
+                Ok(ev) => ev,
+                Err(err) => {
+                    warn!("Failed to deserialize timeline event - {err}");
+                    continue;
+                }
+            });
+        }
+        Ok(())
+    }
+
+    pub fn timeline_add(&mut self, event: AnyTimelineEvent) {
+        self.timeline.push(event);
+    }
+
+    pub fn timeline(&self) -> &Vec<AnyTimelineEvent> { &self.timeline }
+}
+
 impl Status {
     pub fn new(client: Option<Client>) -> Self {
         let rooms = match &client {
-            Some(c) => c.joined_rooms(),
+            Some(c) => {
+                c.joined_rooms()
+                    .iter()
+                    .map(|r| {
+                        Room::new(r.clone())
+                    })
+                    .collect::<Vec<_>>()
+            },
             None => Vec::new(),
         };
 
@@ -50,10 +104,18 @@ impl Status {
         self.account_user_id = user_id;
     }
 
-    pub fn room(&self) -> Option<&matrix_sdk::room::Joined> {
+    pub fn room(&self) -> Option<&Room> {
         self.rooms.get(self.current_room_id? as usize)
     }
 
+    pub fn rooms(&self) -> &Vec<Room> {
+        &self.rooms
+    }
+
+    pub fn rooms_mut(&mut self) -> &mut Vec<Room> {
+        &mut self.rooms
+    }
+    
     pub fn state(&self) -> &State {
         &self.state
     }

src/ui/mod.rs

@@ -276,18 +276,12 @@ impl UI<'_> {
         status_content.extend(Text::styled(status.account_user_id(), Style::default()));
         status_content.extend(Text::styled("settings", Style::default().fg(Color::LightMagenta).add_modifier(Modifier::ITALIC | Modifier::UNDERLINED)));
 
-        let messages_config = MessagesOptions::backward();
-
         let messages_content = match status.room() {
             Some(r) => {
-                r.messages(messages_config)
-                    .await?
-                    .chunk
+                r.timeline()
                     .iter()
-                    .rev()
                     .map(|event| {
-                        match event.event.deserialize() {
-                            Ok(timeline_event) => match timeline_event {
+                        match event {
 
                             // Message Like Events
                             AnyTimelineEvent::MessageLike(message_like_event) => {
@@ -318,10 +312,6 @@ impl UI<'_> {
                                     Span::styled(state.event_type().to_string(), Style::default().fg(Color::DarkGray))
                                 ])
                             }
-                            },
-                            Err(_) => Spans::from(
-                                Span::styled("Failed to deserialize event", Style::default().fg(Color::Red))
-                            )
                         }
                     })
                     .collect::<Vec<_>>()