| 1 | use std::{collections::HashSet, future::Future, panic::AssertUnwindSafe, pin::Pin, sync::Arc}; |
| 2 | |
| 3 | use futures_util::{FutureExt, StreamExt}; |
| 4 | use matrix_sdk::{ |
| 5 | room::edit::EditedContent, |
| 6 | room::reply::{EnforceThread, Reply as SdkReply}, |
| 7 | ruma::{ |
| 8 | api::client::receipt::create_receipt::v3::ReceiptType, |
| 9 | events::{ |
| 10 | Mentions, |
| 11 | room::message::{ |
| 12 | AddMentions, Relation, ReplyWithinThread, RoomMessageEventContentWithoutRelation, |
| 13 | }, |
| 14 | }, |
| 15 | }, |
| 16 | }; |
| 17 | use matrix_sdk_ui::timeline::{Timeline, TimelineEventItemId}; |
| 18 | use ruma::{OwnedEventId, OwnedUserId}; |
| 19 | use tokio::{ |
| 20 | sync::mpsc, |
| 21 | task::{JoinHandle, JoinSet}, |
| 22 | }; |
| 23 | |
| 24 | use crate::{ |
| 25 | Error, ErrorKind, Event, EventRef, HistoryState, MessageContent, MessageEditContent, |
| 26 | MessageMentions, RichText, TimelineCommand, TimelineId, |
| 27 | engine::MediaService, |
| 28 | normalise::{MediaScope, normalise_timeline, normalise_timeline_diffs}, |
| 29 | transport::{EventSender, Responder, SendEventError}, |
| 30 | }; |
| 31 | |
| 32 | const PAGINATION_QUEUE: usize = 32; |
| 33 | |
| 34 | /// long-lived tasks inside a room actor report panics here so the actor can die loudly |
| 35 | #[derive(Clone)] |
| 36 | pub(super) struct Supervisor(mpsc::UnboundedSender<&'static str>); |
| 37 | |
| 38 | impl Supervisor { |
| 39 | pub(super) fn new() -> (Self, mpsc::UnboundedReceiver<&'static str>) { |
| 40 | let (sender, receiver) = mpsc::unbounded_channel(); |
| 41 | (Self(sender), receiver) |
| 42 | } |
| 43 | |
| 44 | pub(super) fn spawn( |
| 45 | &self, |
| 46 | label: &'static str, |
| 47 | task: impl Future<Output = ()> + Send + 'static, |
| 48 | ) -> JoinHandle<()> { |
| 49 | let panics = self.0.clone(); |
| 50 | tokio::spawn(async move { |
| 51 | if AssertUnwindSafe(task).catch_unwind().await.is_err() { |
| 52 | let _ = panics.send(label); |
| 53 | } |
| 54 | }) |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | /// aborts its task when dropped, so an actor that dies mid-flight takes its helpers with it |
| 59 | pub(super) struct TaskGuard(pub(super) JoinHandle<()>); |
| 60 | |
| 61 | impl Drop for TaskGuard { |
| 62 | fn drop(&mut self) { |
| 63 | self.0.abort(); |
| 64 | } |
| 65 | } |
| 66 | |
| 67 | /// what a timeline session needs from the room that owns it |
| 68 | #[derive(Clone)] |
| 69 | pub(super) struct SessionContext { |
| 70 | pub(super) events: EventSender, |
| 71 | pub(super) media: Arc<MediaService>, |
| 72 | pub(super) current_user_id: Option<OwnedUserId>, |
| 73 | pub(super) initial_history_limit: u16, |
| 74 | pub(super) supervisor: Supervisor, |
| 75 | } |
| 76 | |
| 77 | pub(super) struct TimelineSession { |
| 78 | pub(super) id: TimelineId, |
| 79 | timeline: Arc<Timeline>, |
| 80 | context: SessionContext, |
| 81 | scope: MediaScope, |
| 82 | watcher: JoinHandle<()>, |
| 83 | pagination: mpsc::Sender<PaginationRequest>, |
| 84 | pagination_worker: JoinHandle<()>, |
| 85 | } |
| 86 | |
| 87 | struct PaginationRequest { |
| 88 | limit: u16, |
| 89 | reply: Option<Responder>, |
| 90 | } |
| 91 | |
| 92 | impl TimelineSession { |
| 93 | pub(super) async fn start( |
| 94 | id: TimelineId, |
| 95 | timeline: Timeline, |
| 96 | context: SessionContext, |
| 97 | ) -> Result<Self, SendEventError> { |
| 98 | let timeline = Arc::new(timeline); |
| 99 | let scope = MediaScope::new(); |
| 100 | let watcher = start_watcher(&id, &timeline, &context, &scope).await?; |
| 101 | let (pagination, requests) = mpsc::channel(PAGINATION_QUEUE); |
| 102 | let pagination_worker = context.supervisor.spawn( |
| 103 | "pagination worker", |
| 104 | run_pagination( |
| 105 | requests, |
| 106 | timeline.clone(), |
| 107 | context.events.clone(), |
| 108 | id.clone(), |
| 109 | ), |
| 110 | ); |
| 111 | let session = Self { |
| 112 | id, |
| 113 | timeline, |
| 114 | scope, |
| 115 | watcher, |
| 116 | pagination, |
| 117 | pagination_worker, |
| 118 | context, |
| 119 | }; |
| 120 | if session.context.initial_history_limit > 0 { |
| 121 | session.paginate(session.context.initial_history_limit, None); |
| 122 | } |
| 123 | Ok(session) |
| 124 | } |
| 125 | |
| 126 | /// swaps in a fresh watcher. the old one is dead before the reset goes out, |
| 127 | /// so no stale diff can land after it |
| 128 | pub(super) async fn resync(&mut self) -> Result<(), Error> { |
| 129 | self.watcher.abort(); |
| 130 | let _ = (&mut self.watcher).await; |
| 131 | self.watcher = start_watcher(&self.id, &self.timeline, &self.context, &self.scope) |
| 132 | .await |
| 133 | .map_err(|_| Error::new(ErrorKind::Timeline, "timeline reset could not be sent"))?; |
| 134 | Ok(()) |
| 135 | } |
| 136 | |
| 137 | pub(super) fn paginate(&self, limit: u16, reply: Option<Responder>) { |
| 138 | if let Err(error) = self.pagination.try_send(PaginationRequest { limit, reply }) { |
| 139 | let (request, error) = match error { |
| 140 | mpsc::error::TrySendError::Full(request) => ( |
| 141 | request, |
| 142 | Error::new(ErrorKind::QueueFull, "pagination queue is full"), |
| 143 | ), |
| 144 | mpsc::error::TrySendError::Closed(request) => ( |
| 145 | request, |
| 146 | Error::new(ErrorKind::TimelineNotOpen, "timeline is closing"), |
| 147 | ), |
| 148 | }; |
| 149 | if let Some(reply) = request.reply { |
| 150 | reply.done(Err(error)); |
| 151 | } |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | /// pending paginations answer `Interrupted` as their responders drop |
| 156 | pub(super) async fn close(mut self) { |
| 157 | self.pagination_worker.abort(); |
| 158 | let _ = (&mut self.pagination_worker).await; |
| 159 | self.watcher.abort(); |
| 160 | let _ = (&mut self.watcher).await; |
| 161 | // after the watcher, or a last diff could register media for a timeline that's gone |
| 162 | self.context.media.release(&self.scope).await; |
| 163 | } |
| 164 | |
| 165 | pub(super) async fn execute( |
| 166 | &self, |
| 167 | command: TimelineCommand, |
| 168 | reply: Responder, |
| 169 | work: &mut JoinSet<()>, |
| 170 | ) { |
| 171 | let timeline = self.timeline.clone(); |
| 172 | let thread_root = self.id.thread_root().cloned(); |
| 173 | let background: Pin<Box<dyn Future<Output = Result<(), Error>> + Send>> = match command { |
| 174 | TimelineCommand::Paginate { limit, .. } => return self.paginate(limit, Some(reply)), |
| 175 | // network-bound, so it runs beside the actor instead of queueing the room behind it |
| 176 | TimelineCommand::Redact { target, reason, .. } => Box::pin(async move { |
| 177 | timeline |
| 178 | .redact(&item_id(target), reason.as_deref()) |
| 179 | .await |
| 180 | .map_err(timeline_error) |
| 181 | }), |
| 182 | TimelineCommand::ToggleReaction { target, key, .. } => Box::pin(async move { |
| 183 | timeline |
| 184 | .toggle_reaction(&item_id(target), &key) |
| 185 | .await |
| 186 | .map(drop) |
| 187 | .map_err(timeline_error) |
| 188 | }), |
| 189 | TimelineCommand::MarkRead { event_id, .. } => Box::pin(async move { |
| 190 | let receipt_failed = |
| 191 | |source| Error::from_sdk("sending read receipt failed", source); |
| 192 | timeline |
| 193 | .send_single_receipt(ReceiptType::Read, event_id.clone()) |
| 194 | .await |
| 195 | .map_err(receipt_failed)?; |
| 196 | if thread_root.is_none() { |
| 197 | timeline |
| 198 | .send_single_receipt(ReceiptType::FullyRead, event_id) |
| 199 | .await |
| 200 | .map_err(receipt_failed)?; |
| 201 | } |
| 202 | Ok(()) |
| 203 | }), |
| 204 | command => return reply.done(self.execute_serial(command).await), |
| 205 | }; |
| 206 | work.spawn(async move { reply.done(background.await) }); |
| 207 | } |
| 208 | |
| 209 | /// sends stay on the actor so they hit the send queue in the order they were asked for |
| 210 | async fn execute_serial(&self, command: TimelineCommand) -> Result<(), Error> { |
| 211 | let timeline = &self.timeline; |
| 212 | match command { |
| 213 | TimelineCommand::Send { content, .. } => { |
| 214 | let body = match &content { |
| 215 | MessageContent::Text { content, .. } |
| 216 | | MessageContent::Emote { content, .. } |
| 217 | | MessageContent::Reply { content, .. } => &content.body, |
| 218 | }; |
| 219 | if body.trim().is_empty() { |
| 220 | return Err(Error::new(ErrorKind::EmptyBody, "message body is empty")); |
| 221 | } |
| 222 | let content = match content { |
| 223 | MessageContent::Text { content, mentions } => { |
| 224 | message_content(content, mentions, false).with_relation(None) |
| 225 | } |
| 226 | MessageContent::Emote { content, mentions } => { |
| 227 | message_content(content, mentions, true).with_relation(None) |
| 228 | } |
| 229 | MessageContent::Reply { |
| 230 | event_id, |
| 231 | content, |
| 232 | mentions, |
| 233 | notify_replied_to, |
| 234 | } => { |
| 235 | self.reply_content(event_id, content, mentions, notify_replied_to) |
| 236 | .await? |
| 237 | } |
| 238 | }; |
| 239 | timeline |
| 240 | .send(content.into()) |
| 241 | .await |
| 242 | .map(drop) |
| 243 | .map_err(timeline_error) |
| 244 | } |
| 245 | TimelineCommand::Edit { |
| 246 | target, content, .. |
| 247 | } => { |
| 248 | let (content, mentions, emote) = match content { |
| 249 | MessageEditContent::Text { content, mentions } => (content, mentions, false), |
| 250 | MessageEditContent::Emote { content, mentions } => (content, mentions, true), |
| 251 | }; |
| 252 | if content.body.trim().is_empty() { |
| 253 | return Err(Error::new(ErrorKind::EmptyBody, "message body is empty")); |
| 254 | } |
| 255 | timeline |
| 256 | .edit( |
| 257 | &item_id(target), |
| 258 | EditedContent::RoomMessage(message_content(content, mentions, emote)), |
| 259 | ) |
| 260 | .await |
| 261 | .map_err(timeline_error) |
| 262 | } |
| 263 | _ => Err(Error::new( |
| 264 | ErrorKind::Other, |
| 265 | "timeline command was misrouted", |
| 266 | )), |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | async fn reply_content( |
| 271 | &self, |
| 272 | event_id: OwnedEventId, |
| 273 | content: RichText, |
| 274 | mentions: MessageMentions, |
| 275 | notify_replied_to: bool, |
| 276 | ) -> Result<matrix_sdk::ruma::events::room::message::RoomMessageEventContent, Error> { |
| 277 | let thread_root = self.id.thread_root(); |
| 278 | let content = self |
| 279 | .timeline |
| 280 | .room() |
| 281 | .make_reply_event( |
| 282 | message_content(content, mentions, false), |
| 283 | SdkReply { |
| 284 | event_id, |
| 285 | enforce_thread: if thread_root.is_some() { |
| 286 | EnforceThread::Threaded(ReplyWithinThread::Yes) |
| 287 | } else { |
| 288 | EnforceThread::MaybeThreaded |
| 289 | }, |
| 290 | add_mentions: if notify_replied_to { |
| 291 | AddMentions::Yes |
| 292 | } else { |
| 293 | AddMentions::No |
| 294 | }, |
| 295 | }, |
| 296 | ) |
| 297 | .await |
| 298 | .map_err(|source| { |
| 299 | Error::with_source(ErrorKind::Timeline, "reply operation failed", source) |
| 300 | })?; |
| 301 | if let Some(thread_root) = thread_root |
| 302 | && !matches!( |
| 303 | content.relates_to.as_ref(), |
| 304 | Some(Relation::Thread(thread)) if &thread.event_id == thread_root |
| 305 | ) |
| 306 | { |
| 307 | return Err(Error::new( |
| 308 | ErrorKind::Invalid, |
| 309 | "reply target does not belong to the selected thread", |
| 310 | )); |
| 311 | } |
| 312 | Ok(content) |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | impl Drop for TimelineSession { |
| 317 | fn drop(&mut self) { |
| 318 | self.watcher.abort(); |
| 319 | self.pagination_worker.abort(); |
| 320 | } |
| 321 | } |
| 322 | |
| 323 | fn item_id(target: EventRef) -> TimelineEventItemId { |
| 324 | match target { |
| 325 | EventRef::Remote(event_id) => TimelineEventItemId::EventId(event_id), |
| 326 | EventRef::Local(transaction_id) => TimelineEventItemId::TransactionId(transaction_id), |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /// the sdk leaves a reply's target unloaded until someone asks, so the watcher asks, once per event |
| 331 | struct ReplyFetcher { |
| 332 | timeline: Arc<Timeline>, |
| 333 | asked: HashSet<OwnedEventId>, |
| 334 | fetches: JoinSet<()>, |
| 335 | } |
| 336 | |
| 337 | impl ReplyFetcher { |
| 338 | fn fetch(&mut self, missing: Vec<OwnedEventId>) { |
| 339 | for event_id in missing { |
| 340 | if self.asked.insert(event_id.clone()) { |
| 341 | let timeline = self.timeline.clone(); |
| 342 | self.fetches.spawn(async move { |
| 343 | if let Err(error) = timeline.fetch_details_for_event(&event_id).await { |
| 344 | tracing::debug!(%event_id, %error, "fetching reply details failed"); |
| 345 | } |
| 346 | }); |
| 347 | } |
| 348 | } |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | async fn start_watcher( |
| 353 | id: &TimelineId, |
| 354 | timeline: &Arc<Timeline>, |
| 355 | context: &SessionContext, |
| 356 | scope: &MediaScope, |
| 357 | ) -> Result<JoinHandle<()>, SendEventError> { |
| 358 | let (items, mut stream) = timeline.subscribe().await; |
| 359 | let current_user_id = context.current_user_id.clone(); |
| 360 | let normalised = normalise_timeline(items.iter(), current_user_id.as_deref(), scope); |
| 361 | context.media.register(normalised.media).await; |
| 362 | context |
| 363 | .events |
| 364 | .send(Event::TimelineReset { |
| 365 | timeline_id: id.clone(), |
| 366 | items: normalised.items, |
| 367 | }) |
| 368 | .await?; |
| 369 | let mut replies = ReplyFetcher { |
| 370 | timeline: timeline.clone(), |
| 371 | asked: HashSet::new(), |
| 372 | fetches: JoinSet::new(), |
| 373 | }; |
| 374 | replies.fetch(normalised.missing_replies); |
| 375 | let id = id.clone(); |
| 376 | let events = context.events.clone(); |
| 377 | let media = context.media.clone(); |
| 378 | let scope = scope.clone(); |
| 379 | Ok(context.supervisor.spawn("timeline watcher", async move { |
| 380 | loop { |
| 381 | let diffs = tokio::select! { |
| 382 | diffs = stream.next() => match diffs { |
| 383 | Some(diffs) => diffs, |
| 384 | None => return, |
| 385 | }, |
| 386 | Some(_) = replies.fetches.join_next(), if !replies.fetches.is_empty() => continue, |
| 387 | }; |
| 388 | let normalised = normalise_timeline_diffs(diffs, current_user_id.as_deref(), &scope); |
| 389 | media.register(normalised.media).await; |
| 390 | replies.fetch(normalised.missing_replies); |
| 391 | let event = Event::TimelineChanged { |
| 392 | timeline_id: id.clone(), |
| 393 | diffs: normalised.diffs, |
| 394 | }; |
| 395 | if events.send(event).await.is_err() { |
| 396 | return; |
| 397 | } |
| 398 | } |
| 399 | })) |
| 400 | } |
| 401 | |
| 402 | async fn run_pagination( |
| 403 | mut requests: mpsc::Receiver<PaginationRequest>, |
| 404 | timeline: Arc<Timeline>, |
| 405 | events: EventSender, |
| 406 | timeline_id: TimelineId, |
| 407 | ) { |
| 408 | while let Some(PaginationRequest { limit, reply }) = requests.recv().await { |
| 409 | let history = |state| Event::HistoryChanged { |
| 410 | timeline_id: timeline_id.clone(), |
| 411 | state, |
| 412 | }; |
| 413 | if events.send(history(HistoryState::Loading)).await.is_err() { |
| 414 | return; |
| 415 | } |
| 416 | let result = timeline |
| 417 | .paginate_backwards(limit.max(1)) |
| 418 | .await |
| 419 | .map_err(timeline_error); |
| 420 | let state = match &result { |
| 421 | Ok(true) => HistoryState::StartReached, |
| 422 | Ok(false) => HistoryState::Idle, |
| 423 | Err(error) => HistoryState::Failed(error.to_string()), |
| 424 | }; |
| 425 | let _ = events.send(history(state)).await; |
| 426 | if let Some(reply) = reply { |
| 427 | reply.done(result.map(drop)); |
| 428 | } |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | fn message_content( |
| 433 | content: RichText, |
| 434 | mentions: MessageMentions, |
| 435 | emote: bool, |
| 436 | ) -> RoomMessageEventContentWithoutRelation { |
| 437 | let content = match content.formatted_body { |
| 438 | Some(formatted_body) if emote => { |
| 439 | RoomMessageEventContentWithoutRelation::emote_html(content.body, formatted_body) |
| 440 | } |
| 441 | Some(formatted_body) => { |
| 442 | RoomMessageEventContentWithoutRelation::text_html(content.body, formatted_body) |
| 443 | } |
| 444 | None if emote => RoomMessageEventContentWithoutRelation::emote_plain(content.body), |
| 445 | None => RoomMessageEventContentWithoutRelation::text_plain(content.body), |
| 446 | }; |
| 447 | let content = content.add_mentions(Mentions::with_user_ids(mentions.user_ids)); |
| 448 | if mentions.room { |
| 449 | content.add_mentions(Mentions::with_room_mention()) |
| 450 | } else { |
| 451 | content |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | pub(super) fn timeline_error(source: matrix_sdk_ui::timeline::Error) -> Error { |
| 456 | Error::with_source(ErrorKind::Timeline, "timeline operation failed", source) |
| 457 | } |