Get latest message for a room

matrixgw_backend/src/controllers/matrix/matrix_event_controller.rs

@@ -0,0 +1,60 @@
+use futures_util::{StreamExt, stream};
+use matrix_sdk::Room;
+use matrix_sdk::deserialized_responses::{TimelineEvent, TimelineEventKind};
+use matrix_sdk::room::MessagesOptions;
+use matrix_sdk::ruma::{MilliSecondsSinceUnixEpoch, OwnedEventId, OwnedUserId, RoomId, UInt};
+use serde::Serialize;
+use serde_json::value::RawValue;
+
+#[derive(Serialize)]
+pub struct APIEvent {
+    id: OwnedEventId,
+    time: MilliSecondsSinceUnixEpoch,
+    sender: OwnedUserId,
+    data: Box<RawValue>,
+}
+
+impl APIEvent {
+    pub async fn from_evt(msg: TimelineEvent, room_id: &RoomId) -> anyhow::Result<Self> {
+        let (event, raw) = match &msg.kind {
+            TimelineEventKind::Decrypted(d) => (d.event.deserialize()?, d.event.json()),
+            TimelineEventKind::UnableToDecrypt { event, .. }
+            | TimelineEventKind::PlainText { event } => (
+                event.deserialize()?.into_full_event(room_id.to_owned()),
+                event.json(),
+            ),
+        };
+
+        Ok(Self {
+            id: event.event_id().to_owned(),
+            time: event.origin_server_ts(),
+            sender: event.sender().to_owned(),
+            data: raw.to_owned(),
+        })
+    }
+}
+
+#[derive(Serialize)]
+pub struct APIEventsList {
+    pub start: String,
+    pub end: Option<String>,
+    pub messages: Vec<APIEvent>,
+}
+
+/// Get messages for a given room
+pub(super) async fn get_events(room: &Room, limit: u32) -> anyhow::Result<APIEventsList> {
+    let mut msg_opts = MessagesOptions::backward();
+    msg_opts.limit = UInt::from(limit);
+
+    let messages = room.messages(msg_opts).await?;
+    Ok(APIEventsList {
+        start: messages.start,
+        end: messages.end,
+        messages: stream::iter(messages.chunk)
+            .then(async |msg| APIEvent::from_evt(msg, room.room_id()).await)
+            .collect::<Vec<_>>()
+            .await
+            .into_iter()
+            .collect::<Result<Vec<_>, _>>()?,
+    })
+}