1use crate::{Channel, ChannelStore};
2use anyhow::{anyhow, Result};
3use client::{
4 proto,
5 user::{User, UserStore},
6 ChannelId, Client, Subscription, TypedEnvelope, UserId,
7};
8use collections::HashSet;
9use futures::lock::Mutex;
10use gpui::{
11 AppContext, AsyncAppContext, Context, EventEmitter, Model, ModelContext, Task, WeakModel,
12};
13use rand::prelude::*;
14use std::{
15 ops::{ControlFlow, Range},
16 sync::Arc,
17};
18use sum_tree::{Bias, SumTree};
19use time::OffsetDateTime;
20use util::{post_inc, ResultExt as _, TryFutureExt};
21
22pub struct ChannelChat {
23 pub channel_id: ChannelId,
24 messages: SumTree<ChannelMessage>,
25 acknowledged_message_ids: HashSet<u64>,
26 channel_store: Model<ChannelStore>,
27 loaded_all_messages: bool,
28 last_acknowledged_id: Option<u64>,
29 next_pending_message_id: usize,
30 first_loaded_message_id: Option<u64>,
31 user_store: Model<UserStore>,
32 rpc: Arc<Client>,
33 outgoing_messages_lock: Arc<Mutex<()>>,
34 rng: StdRng,
35 _subscription: Subscription,
36}
37
38#[derive(Debug, PartialEq, Eq)]
39pub struct MessageParams {
40 pub text: String,
41 pub mentions: Vec<(Range<usize>, UserId)>,
42 pub reply_to_message_id: Option<u64>,
43}
44
45#[derive(Clone, Debug)]
46pub struct ChannelMessage {
47 pub id: ChannelMessageId,
48 pub body: String,
49 pub timestamp: OffsetDateTime,
50 pub sender: Arc<User>,
51 pub nonce: u128,
52 pub mentions: Vec<(Range<usize>, UserId)>,
53 pub reply_to_message_id: Option<u64>,
54 pub edited_at: Option<OffsetDateTime>,
55}
56
57#[derive(Copy, Clone, Debug, PartialEq, Eq, PartialOrd, Ord, Hash)]
58pub enum ChannelMessageId {
59 Saved(u64),
60 Pending(usize),
61}
62
63impl Into<Option<u64>> for ChannelMessageId {
64 fn into(self) -> Option<u64> {
65 match self {
66 ChannelMessageId::Saved(id) => Some(id),
67 ChannelMessageId::Pending(_) => None,
68 }
69 }
70}
71
72#[derive(Clone, Debug, Default)]
73pub struct ChannelMessageSummary {
74 max_id: ChannelMessageId,
75 count: usize,
76}
77
78#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
79struct Count(usize);
80
81#[derive(Clone, Debug, PartialEq)]
82pub enum ChannelChatEvent {
83 MessagesUpdated {
84 old_range: Range<usize>,
85 new_count: usize,
86 },
87 UpdateMessage {
88 message_id: ChannelMessageId,
89 message_ix: usize,
90 },
91 NewMessage {
92 channel_id: ChannelId,
93 message_id: u64,
94 },
95}
96
97impl EventEmitter<ChannelChatEvent> for ChannelChat {}
98pub fn init(client: &Arc<Client>) {
99 client.add_model_message_handler(ChannelChat::handle_message_sent);
100 client.add_model_message_handler(ChannelChat::handle_message_removed);
101 client.add_model_message_handler(ChannelChat::handle_message_updated);
102}
103
104impl ChannelChat {
105 pub async fn new(
106 channel: Arc<Channel>,
107 channel_store: Model<ChannelStore>,
108 user_store: Model<UserStore>,
109 client: Arc<Client>,
110 mut cx: AsyncAppContext,
111 ) -> Result<Model<Self>> {
112 let channel_id = channel.id;
113 let subscription = client.subscribe_to_entity(channel_id.0).unwrap();
114
115 let response = client
116 .request(proto::JoinChannelChat {
117 channel_id: channel_id.0,
118 })
119 .await?;
120
121 let handle = cx.new_model(|cx| {
122 cx.on_release(Self::release).detach();
123 Self {
124 channel_id: channel.id,
125 user_store: user_store.clone(),
126 channel_store,
127 rpc: client.clone(),
128 outgoing_messages_lock: Default::default(),
129 messages: Default::default(),
130 acknowledged_message_ids: Default::default(),
131 loaded_all_messages: false,
132 next_pending_message_id: 0,
133 last_acknowledged_id: None,
134 rng: StdRng::from_entropy(),
135 first_loaded_message_id: None,
136 _subscription: subscription.set_model(&cx.handle(), &mut cx.to_async()),
137 }
138 })?;
139 Self::handle_loaded_messages(
140 handle.downgrade(),
141 user_store,
142 client,
143 response.messages,
144 response.done,
145 &mut cx,
146 )
147 .await?;
148 Ok(handle)
149 }
150
151 fn release(&mut self, _: &mut AppContext) {
152 self.rpc
153 .send(proto::LeaveChannelChat {
154 channel_id: self.channel_id.0,
155 })
156 .log_err();
157 }
158
159 pub fn channel(&self, cx: &AppContext) -> Option<Arc<Channel>> {
160 self.channel_store
161 .read(cx)
162 .channel_for_id(self.channel_id)
163 .cloned()
164 }
165
166 pub fn client(&self) -> &Arc<Client> {
167 &self.rpc
168 }
169
170 pub fn send_message(
171 &mut self,
172 message: MessageParams,
173 cx: &mut ModelContext<Self>,
174 ) -> Result<Task<Result<u64>>> {
175 if message.text.trim().is_empty() {
176 Err(anyhow!("message body can't be empty"))?;
177 }
178
179 let current_user = self
180 .user_store
181 .read(cx)
182 .current_user()
183 .ok_or_else(|| anyhow!("current_user is not present"))?;
184
185 let channel_id = self.channel_id;
186 let pending_id = ChannelMessageId::Pending(post_inc(&mut self.next_pending_message_id));
187 let nonce = self.rng.gen();
188 self.insert_messages(
189 SumTree::from_item(
190 ChannelMessage {
191 id: pending_id,
192 body: message.text.clone(),
193 sender: current_user,
194 timestamp: OffsetDateTime::now_utc(),
195 mentions: message.mentions.clone(),
196 nonce,
197 reply_to_message_id: message.reply_to_message_id,
198 edited_at: None,
199 },
200 &(),
201 ),
202 cx,
203 );
204 let user_store = self.user_store.clone();
205 let rpc = self.rpc.clone();
206 let outgoing_messages_lock = self.outgoing_messages_lock.clone();
207
208 // todo - handle messages that fail to send (e.g. >1024 chars)
209 Ok(cx.spawn(move |this, mut cx| async move {
210 let outgoing_message_guard = outgoing_messages_lock.lock().await;
211 let request = rpc.request(proto::SendChannelMessage {
212 channel_id: channel_id.0,
213 body: message.text,
214 nonce: Some(nonce.into()),
215 mentions: mentions_to_proto(&message.mentions),
216 reply_to_message_id: message.reply_to_message_id,
217 });
218 let response = request.await?;
219 drop(outgoing_message_guard);
220 let response = response.message.ok_or_else(|| anyhow!("invalid message"))?;
221 let id = response.id;
222 let message = ChannelMessage::from_proto(response, &user_store, &mut cx).await?;
223 this.update(&mut cx, |this, cx| {
224 this.insert_messages(SumTree::from_item(message, &()), cx);
225 })?;
226 Ok(id)
227 }))
228 }
229
230 pub fn remove_message(&mut self, id: u64, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
231 let response = self.rpc.request(proto::RemoveChannelMessage {
232 channel_id: self.channel_id.0,
233 message_id: id,
234 });
235 cx.spawn(move |this, mut cx| async move {
236 response.await?;
237 this.update(&mut cx, |this, cx| {
238 this.message_removed(id, cx);
239 })?;
240 Ok(())
241 })
242 }
243
244 pub fn update_message(
245 &mut self,
246 id: u64,
247 message: MessageParams,
248 cx: &mut ModelContext<Self>,
249 ) -> Result<Task<Result<()>>> {
250 self.message_update(
251 ChannelMessageId::Saved(id),
252 message.text.clone(),
253 message.mentions.clone(),
254 Some(OffsetDateTime::now_utc()),
255 cx,
256 );
257
258 let nonce: u128 = self.rng.gen();
259
260 let request = self.rpc.request(proto::UpdateChannelMessage {
261 channel_id: self.channel_id.0,
262 message_id: id,
263 body: message.text,
264 nonce: Some(nonce.into()),
265 mentions: mentions_to_proto(&message.mentions),
266 });
267 Ok(cx.spawn(move |_, _| async move {
268 request.await?;
269 Ok(())
270 }))
271 }
272
273 pub fn load_more_messages(&mut self, cx: &mut ModelContext<Self>) -> Option<Task<Option<()>>> {
274 if self.loaded_all_messages {
275 return None;
276 }
277
278 let rpc = self.rpc.clone();
279 let user_store = self.user_store.clone();
280 let channel_id = self.channel_id;
281 let before_message_id = self.first_loaded_message_id()?;
282 Some(cx.spawn(move |this, mut cx| {
283 async move {
284 let response = rpc
285 .request(proto::GetChannelMessages {
286 channel_id: channel_id.0,
287 before_message_id,
288 })
289 .await?;
290 Self::handle_loaded_messages(
291 this,
292 user_store,
293 rpc,
294 response.messages,
295 response.done,
296 &mut cx,
297 )
298 .await?;
299
300 anyhow::Ok(())
301 }
302 .log_err()
303 }))
304 }
305
306 pub fn first_loaded_message_id(&mut self) -> Option<u64> {
307 self.first_loaded_message_id
308 }
309
310 /// Load a message by its id, if it's already stored locally.
311 pub fn find_loaded_message(&self, id: u64) -> Option<&ChannelMessage> {
312 self.messages.iter().find(|message| match message.id {
313 ChannelMessageId::Saved(message_id) => message_id == id,
314 ChannelMessageId::Pending(_) => false,
315 })
316 }
317
318 /// Load all of the chat messages since a certain message id.
319 ///
320 /// For now, we always maintain a suffix of the channel's messages.
321 pub async fn load_history_since_message(
322 chat: Model<Self>,
323 message_id: u64,
324 mut cx: AsyncAppContext,
325 ) -> Option<usize> {
326 loop {
327 let step = chat
328 .update(&mut cx, |chat, cx| {
329 if let Some(first_id) = chat.first_loaded_message_id() {
330 if first_id <= message_id {
331 let mut cursor = chat.messages.cursor::<(ChannelMessageId, Count)>();
332 let message_id = ChannelMessageId::Saved(message_id);
333 cursor.seek(&message_id, Bias::Left, &());
334 return ControlFlow::Break(
335 if cursor
336 .item()
337 .map_or(false, |message| message.id == message_id)
338 {
339 Some(cursor.start().1 .0)
340 } else {
341 None
342 },
343 );
344 }
345 }
346 ControlFlow::Continue(chat.load_more_messages(cx))
347 })
348 .log_err()?;
349 match step {
350 ControlFlow::Break(ix) => return ix,
351 ControlFlow::Continue(task) => task?.await?,
352 }
353 }
354 }
355
356 pub fn acknowledge_last_message(&mut self, cx: &mut ModelContext<Self>) {
357 if let ChannelMessageId::Saved(latest_message_id) = self.messages.summary().max_id {
358 if self
359 .last_acknowledged_id
360 .map_or(true, |acknowledged_id| acknowledged_id < latest_message_id)
361 {
362 self.rpc
363 .send(proto::AckChannelMessage {
364 channel_id: self.channel_id.0,
365 message_id: latest_message_id,
366 })
367 .ok();
368 self.last_acknowledged_id = Some(latest_message_id);
369 self.channel_store.update(cx, |store, cx| {
370 store.acknowledge_message_id(self.channel_id, latest_message_id, cx);
371 });
372 }
373 }
374 }
375
376 async fn handle_loaded_messages(
377 this: WeakModel<Self>,
378 user_store: Model<UserStore>,
379 rpc: Arc<Client>,
380 proto_messages: Vec<proto::ChannelMessage>,
381 loaded_all_messages: bool,
382 cx: &mut AsyncAppContext,
383 ) -> Result<()> {
384 let loaded_messages = messages_from_proto(proto_messages, &user_store, cx).await?;
385
386 let first_loaded_message_id = loaded_messages.first().map(|m| m.id);
387 let loaded_message_ids = this.update(cx, |this, _| {
388 let mut loaded_message_ids: HashSet<u64> = HashSet::default();
389 for message in loaded_messages.iter() {
390 if let Some(saved_message_id) = message.id.into() {
391 loaded_message_ids.insert(saved_message_id);
392 }
393 }
394 for message in this.messages.iter() {
395 if let Some(saved_message_id) = message.id.into() {
396 loaded_message_ids.insert(saved_message_id);
397 }
398 }
399 loaded_message_ids
400 })?;
401
402 let missing_ancestors = loaded_messages
403 .iter()
404 .filter_map(|message| {
405 if let Some(ancestor_id) = message.reply_to_message_id {
406 if !loaded_message_ids.contains(&ancestor_id) {
407 return Some(ancestor_id);
408 }
409 }
410 None
411 })
412 .collect::<Vec<_>>();
413
414 let loaded_ancestors = if missing_ancestors.is_empty() {
415 None
416 } else {
417 let response = rpc
418 .request(proto::GetChannelMessagesById {
419 message_ids: missing_ancestors,
420 })
421 .await?;
422 Some(messages_from_proto(response.messages, &user_store, cx).await?)
423 };
424 this.update(cx, |this, cx| {
425 this.first_loaded_message_id = first_loaded_message_id.and_then(|msg_id| msg_id.into());
426 this.loaded_all_messages = loaded_all_messages;
427 this.insert_messages(loaded_messages, cx);
428 if let Some(loaded_ancestors) = loaded_ancestors {
429 this.insert_messages(loaded_ancestors, cx);
430 }
431 })?;
432
433 Ok(())
434 }
435
436 pub fn rejoin(&mut self, cx: &mut ModelContext<Self>) {
437 let user_store = self.user_store.clone();
438 let rpc = self.rpc.clone();
439 let channel_id = self.channel_id;
440 cx.spawn(move |this, mut cx| {
441 async move {
442 let response = rpc
443 .request(proto::JoinChannelChat {
444 channel_id: channel_id.0,
445 })
446 .await?;
447 Self::handle_loaded_messages(
448 this.clone(),
449 user_store.clone(),
450 rpc.clone(),
451 response.messages,
452 response.done,
453 &mut cx,
454 )
455 .await?;
456
457 let pending_messages = this.update(&mut cx, |this, _| {
458 this.pending_messages().cloned().collect::<Vec<_>>()
459 })?;
460
461 for pending_message in pending_messages {
462 let request = rpc.request(proto::SendChannelMessage {
463 channel_id: channel_id.0,
464 body: pending_message.body,
465 mentions: mentions_to_proto(&pending_message.mentions),
466 nonce: Some(pending_message.nonce.into()),
467 reply_to_message_id: pending_message.reply_to_message_id,
468 });
469 let response = request.await?;
470 let message = ChannelMessage::from_proto(
471 response.message.ok_or_else(|| anyhow!("invalid message"))?,
472 &user_store,
473 &mut cx,
474 )
475 .await?;
476 this.update(&mut cx, |this, cx| {
477 this.insert_messages(SumTree::from_item(message, &()), cx);
478 })?;
479 }
480
481 anyhow::Ok(())
482 }
483 .log_err()
484 })
485 .detach();
486 }
487
488 pub fn message_count(&self) -> usize {
489 self.messages.summary().count
490 }
491
492 pub fn messages(&self) -> &SumTree<ChannelMessage> {
493 &self.messages
494 }
495
496 pub fn message(&self, ix: usize) -> &ChannelMessage {
497 let mut cursor = self.messages.cursor::<Count>();
498 cursor.seek(&Count(ix), Bias::Right, &());
499 cursor.item().unwrap()
500 }
501
502 pub fn acknowledge_message(&mut self, id: u64) {
503 if self.acknowledged_message_ids.insert(id) {
504 self.rpc
505 .send(proto::AckChannelMessage {
506 channel_id: self.channel_id.0,
507 message_id: id,
508 })
509 .ok();
510 }
511 }
512
513 pub fn messages_in_range(&self, range: Range<usize>) -> impl Iterator<Item = &ChannelMessage> {
514 let mut cursor = self.messages.cursor::<Count>();
515 cursor.seek(&Count(range.start), Bias::Right, &());
516 cursor.take(range.len())
517 }
518
519 pub fn pending_messages(&self) -> impl Iterator<Item = &ChannelMessage> {
520 let mut cursor = self.messages.cursor::<ChannelMessageId>();
521 cursor.seek(&ChannelMessageId::Pending(0), Bias::Left, &());
522 cursor
523 }
524
525 async fn handle_message_sent(
526 this: Model<Self>,
527 message: TypedEnvelope<proto::ChannelMessageSent>,
528 _: Arc<Client>,
529 mut cx: AsyncAppContext,
530 ) -> Result<()> {
531 let user_store = this.update(&mut cx, |this, _| this.user_store.clone())?;
532 let message = message
533 .payload
534 .message
535 .ok_or_else(|| anyhow!("empty message"))?;
536 let message_id = message.id;
537
538 let message = ChannelMessage::from_proto(message, &user_store, &mut cx).await?;
539 this.update(&mut cx, |this, cx| {
540 this.insert_messages(SumTree::from_item(message, &()), cx);
541 cx.emit(ChannelChatEvent::NewMessage {
542 channel_id: this.channel_id,
543 message_id,
544 })
545 })?;
546
547 Ok(())
548 }
549
550 async fn handle_message_removed(
551 this: Model<Self>,
552 message: TypedEnvelope<proto::RemoveChannelMessage>,
553 _: Arc<Client>,
554 mut cx: AsyncAppContext,
555 ) -> Result<()> {
556 this.update(&mut cx, |this, cx| {
557 this.message_removed(message.payload.message_id, cx)
558 })?;
559 Ok(())
560 }
561
562 async fn handle_message_updated(
563 this: Model<Self>,
564 message: TypedEnvelope<proto::ChannelMessageUpdate>,
565 _: Arc<Client>,
566 mut cx: AsyncAppContext,
567 ) -> Result<()> {
568 let user_store = this.update(&mut cx, |this, _| this.user_store.clone())?;
569 let message = message
570 .payload
571 .message
572 .ok_or_else(|| anyhow!("empty message"))?;
573
574 let message = ChannelMessage::from_proto(message, &user_store, &mut cx).await?;
575
576 this.update(&mut cx, |this, cx| {
577 this.message_update(
578 message.id,
579 message.body,
580 message.mentions,
581 message.edited_at,
582 cx,
583 )
584 })?;
585 Ok(())
586 }
587
588 fn insert_messages(&mut self, messages: SumTree<ChannelMessage>, cx: &mut ModelContext<Self>) {
589 if let Some((first_message, last_message)) = messages.first().zip(messages.last()) {
590 let nonces = messages
591 .cursor::<()>()
592 .map(|m| m.nonce)
593 .collect::<HashSet<_>>();
594
595 let mut old_cursor = self.messages.cursor::<(ChannelMessageId, Count)>();
596 let mut new_messages = old_cursor.slice(&first_message.id, Bias::Left, &());
597 let start_ix = old_cursor.start().1 .0;
598 let removed_messages = old_cursor.slice(&last_message.id, Bias::Right, &());
599 let removed_count = removed_messages.summary().count;
600 let new_count = messages.summary().count;
601 let end_ix = start_ix + removed_count;
602
603 new_messages.append(messages, &());
604
605 let mut ranges = Vec::<Range<usize>>::new();
606 if new_messages.last().unwrap().is_pending() {
607 new_messages.append(old_cursor.suffix(&()), &());
608 } else {
609 new_messages.append(
610 old_cursor.slice(&ChannelMessageId::Pending(0), Bias::Left, &()),
611 &(),
612 );
613
614 while let Some(message) = old_cursor.item() {
615 let message_ix = old_cursor.start().1 .0;
616 if nonces.contains(&message.nonce) {
617 if ranges.last().map_or(false, |r| r.end == message_ix) {
618 ranges.last_mut().unwrap().end += 1;
619 } else {
620 ranges.push(message_ix..message_ix + 1);
621 }
622 } else {
623 new_messages.push(message.clone(), &());
624 }
625 old_cursor.next(&());
626 }
627 }
628
629 drop(old_cursor);
630 self.messages = new_messages;
631
632 for range in ranges.into_iter().rev() {
633 cx.emit(ChannelChatEvent::MessagesUpdated {
634 old_range: range,
635 new_count: 0,
636 });
637 }
638 cx.emit(ChannelChatEvent::MessagesUpdated {
639 old_range: start_ix..end_ix,
640 new_count,
641 });
642
643 cx.notify();
644 }
645 }
646
647 fn message_removed(&mut self, id: u64, cx: &mut ModelContext<Self>) {
648 let mut cursor = self.messages.cursor::<ChannelMessageId>();
649 let mut messages = cursor.slice(&ChannelMessageId::Saved(id), Bias::Left, &());
650 if let Some(item) = cursor.item() {
651 if item.id == ChannelMessageId::Saved(id) {
652 let ix = messages.summary().count;
653 cursor.next(&());
654 messages.append(cursor.suffix(&()), &());
655 drop(cursor);
656 self.messages = messages;
657 cx.emit(ChannelChatEvent::MessagesUpdated {
658 old_range: ix..ix + 1,
659 new_count: 0,
660 });
661 }
662 }
663 }
664
665 fn message_update(
666 &mut self,
667 id: ChannelMessageId,
668 body: String,
669 mentions: Vec<(Range<usize>, u64)>,
670 edited_at: Option<OffsetDateTime>,
671 cx: &mut ModelContext<Self>,
672 ) {
673 let mut cursor = self.messages.cursor::<ChannelMessageId>();
674 let mut messages = cursor.slice(&id, Bias::Left, &());
675 let ix = messages.summary().count;
676
677 if let Some(mut message_to_update) = cursor.item().cloned() {
678 message_to_update.body = body;
679 message_to_update.mentions = mentions;
680 message_to_update.edited_at = edited_at;
681 messages.push(message_to_update, &());
682 cursor.next(&());
683 }
684
685 messages.append(cursor.suffix(&()), &());
686 drop(cursor);
687 self.messages = messages;
688
689 cx.emit(ChannelChatEvent::UpdateMessage {
690 message_ix: ix,
691 message_id: id,
692 });
693
694 cx.notify();
695 }
696}
697
698async fn messages_from_proto(
699 proto_messages: Vec<proto::ChannelMessage>,
700 user_store: &Model<UserStore>,
701 cx: &mut AsyncAppContext,
702) -> Result<SumTree<ChannelMessage>> {
703 let messages = ChannelMessage::from_proto_vec(proto_messages, user_store, cx).await?;
704 let mut result = SumTree::new();
705 result.extend(messages, &());
706 Ok(result)
707}
708
709impl ChannelMessage {
710 pub async fn from_proto(
711 message: proto::ChannelMessage,
712 user_store: &Model<UserStore>,
713 cx: &mut AsyncAppContext,
714 ) -> Result<Self> {
715 let sender = user_store
716 .update(cx, |user_store, cx| {
717 user_store.get_user(message.sender_id, cx)
718 })?
719 .await?;
720
721 let edited_at = message.edited_at.and_then(|t| -> Option<OffsetDateTime> {
722 if let Ok(a) = OffsetDateTime::from_unix_timestamp(t as i64) {
723 return Some(a);
724 }
725
726 None
727 });
728
729 Ok(ChannelMessage {
730 id: ChannelMessageId::Saved(message.id),
731 body: message.body,
732 mentions: message
733 .mentions
734 .into_iter()
735 .filter_map(|mention| {
736 let range = mention.range?;
737 Some((range.start as usize..range.end as usize, mention.user_id))
738 })
739 .collect(),
740 timestamp: OffsetDateTime::from_unix_timestamp(message.timestamp as i64)?,
741 sender,
742 nonce: message
743 .nonce
744 .ok_or_else(|| anyhow!("nonce is required"))?
745 .into(),
746 reply_to_message_id: message.reply_to_message_id,
747 edited_at,
748 })
749 }
750
751 pub fn is_pending(&self) -> bool {
752 matches!(self.id, ChannelMessageId::Pending(_))
753 }
754
755 pub async fn from_proto_vec(
756 proto_messages: Vec<proto::ChannelMessage>,
757 user_store: &Model<UserStore>,
758 cx: &mut AsyncAppContext,
759 ) -> Result<Vec<Self>> {
760 let unique_user_ids = proto_messages
761 .iter()
762 .map(|m| m.sender_id)
763 .collect::<HashSet<_>>()
764 .into_iter()
765 .collect();
766 user_store
767 .update(cx, |user_store, cx| {
768 user_store.get_users(unique_user_ids, cx)
769 })?
770 .await?;
771
772 let mut messages = Vec::with_capacity(proto_messages.len());
773 for message in proto_messages {
774 messages.push(ChannelMessage::from_proto(message, user_store, cx).await?);
775 }
776 Ok(messages)
777 }
778}
779
780pub fn mentions_to_proto(mentions: &[(Range<usize>, UserId)]) -> Vec<proto::ChatMention> {
781 mentions
782 .iter()
783 .map(|(range, user_id)| proto::ChatMention {
784 range: Some(proto::Range {
785 start: range.start as u64,
786 end: range.end as u64,
787 }),
788 user_id: *user_id,
789 })
790 .collect()
791}
792
793impl sum_tree::Item for ChannelMessage {
794 type Summary = ChannelMessageSummary;
795
796 fn summary(&self) -> Self::Summary {
797 ChannelMessageSummary {
798 max_id: self.id,
799 count: 1,
800 }
801 }
802}
803
804impl Default for ChannelMessageId {
805 fn default() -> Self {
806 Self::Saved(0)
807 }
808}
809
810impl sum_tree::Summary for ChannelMessageSummary {
811 type Context = ();
812
813 fn add_summary(&mut self, summary: &Self, _: &()) {
814 self.max_id = summary.max_id;
815 self.count += summary.count;
816 }
817}
818
819impl<'a> sum_tree::Dimension<'a, ChannelMessageSummary> for ChannelMessageId {
820 fn add_summary(&mut self, summary: &'a ChannelMessageSummary, _: &()) {
821 debug_assert!(summary.max_id > *self);
822 *self = summary.max_id;
823 }
824}
825
826impl<'a> sum_tree::Dimension<'a, ChannelMessageSummary> for Count {
827 fn add_summary(&mut self, summary: &'a ChannelMessageSummary, _: &()) {
828 self.0 += summary.count;
829 }
830}
831
832impl<'a> From<&'a str> for MessageParams {
833 fn from(value: &'a str) -> Self {
834 Self {
835 text: value.into(),
836 mentions: Vec::new(),
837 reply_to_message_id: None,
838 }
839 }
840}