1use crate::{Channel, ChannelId, ChannelStore};
2use anyhow::Result;
3use client::{Client, Collaborator, UserStore};
4use collections::HashMap;
5use gpui::{AppContext, AsyncAppContext, Context, EventEmitter, Model, ModelContext, Task};
6use language::proto::serialize_version;
7use rpc::{
8 proto::{self, PeerId},
9 TypedEnvelope,
10};
11use std::{sync::Arc, time::Duration};
12use util::ResultExt;
13
14pub const ACKNOWLEDGE_DEBOUNCE_INTERVAL: Duration = Duration::from_millis(250);
15
16pub(crate) fn init(client: &Arc<Client>) {
17 client.add_model_message_handler(ChannelBuffer::handle_update_channel_buffer);
18 client.add_model_message_handler(ChannelBuffer::handle_update_channel_buffer_collaborators);
19}
20
21pub struct ChannelBuffer {
22 pub channel_id: ChannelId,
23 connected: bool,
24 collaborators: HashMap<PeerId, Collaborator>,
25 user_store: Model<UserStore>,
26 channel_store: Model<ChannelStore>,
27 buffer: Model<language::Buffer>,
28 buffer_epoch: u64,
29 client: Arc<Client>,
30 subscription: Option<client::Subscription>,
31 acknowledge_task: Option<Task<Result<()>>>,
32}
33
34pub enum ChannelBufferEvent {
35 CollaboratorsChanged,
36 Disconnected,
37 BufferEdited,
38 ChannelChanged,
39}
40
41impl EventEmitter for ChannelBuffer {
42 type Event = ChannelBufferEvent;
43}
44
45impl ChannelBuffer {
46 pub(crate) async fn new(
47 channel: Arc<Channel>,
48 client: Arc<Client>,
49 user_store: Model<UserStore>,
50 channel_store: Model<ChannelStore>,
51 mut cx: AsyncAppContext,
52 ) -> Result<Model<Self>> {
53 let response = client
54 .request(proto::JoinChannelBuffer {
55 channel_id: channel.id,
56 })
57 .await?;
58
59 let base_text = response.base_text;
60 let operations = response
61 .operations
62 .into_iter()
63 .map(language::proto::deserialize_operation)
64 .collect::<Result<Vec<_>, _>>()?;
65
66 let buffer = cx.build_model(|_| {
67 language::Buffer::remote(response.buffer_id, response.replica_id as u16, base_text)
68 })?;
69 buffer.update(&mut cx, |buffer, cx| buffer.apply_ops(operations, cx))??;
70
71 let subscription = client.subscribe_to_entity(channel.id)?;
72
73 anyhow::Ok(cx.build_model(|cx| {
74 cx.subscribe(&buffer, Self::on_buffer_update).detach();
75 cx.on_release(Self::release).detach();
76 let mut this = Self {
77 buffer,
78 buffer_epoch: response.epoch,
79 client,
80 connected: true,
81 collaborators: Default::default(),
82 acknowledge_task: None,
83 channel_id: channel.id,
84 subscription: Some(subscription.set_model(&cx.handle(), &mut cx.to_async())),
85 user_store,
86 channel_store,
87 };
88 this.replace_collaborators(response.collaborators, cx);
89 this
90 })?)
91 }
92
93 fn release(&mut self, _: &mut AppContext) {
94 if self.connected {
95 if let Some(task) = self.acknowledge_task.take() {
96 task.detach();
97 }
98 self.client
99 .send(proto::LeaveChannelBuffer {
100 channel_id: self.channel_id,
101 })
102 .log_err();
103 }
104 }
105
106 pub fn remote_id(&self, cx: &AppContext) -> u64 {
107 self.buffer.read(cx).remote_id()
108 }
109
110 pub fn user_store(&self) -> &Model<UserStore> {
111 &self.user_store
112 }
113
114 pub(crate) fn replace_collaborators(
115 &mut self,
116 collaborators: Vec<proto::Collaborator>,
117 cx: &mut ModelContext<Self>,
118 ) {
119 let mut new_collaborators = HashMap::default();
120 for collaborator in collaborators {
121 if let Ok(collaborator) = Collaborator::from_proto(collaborator) {
122 new_collaborators.insert(collaborator.peer_id, collaborator);
123 }
124 }
125
126 for (_, old_collaborator) in &self.collaborators {
127 if !new_collaborators.contains_key(&old_collaborator.peer_id) {
128 self.buffer.update(cx, |buffer, cx| {
129 buffer.remove_peer(old_collaborator.replica_id as u16, cx)
130 });
131 }
132 }
133 self.collaborators = new_collaborators;
134 cx.emit(ChannelBufferEvent::CollaboratorsChanged);
135 cx.notify();
136 }
137
138 async fn handle_update_channel_buffer(
139 this: Model<Self>,
140 update_channel_buffer: TypedEnvelope<proto::UpdateChannelBuffer>,
141 _: Arc<Client>,
142 mut cx: AsyncAppContext,
143 ) -> Result<()> {
144 let ops = update_channel_buffer
145 .payload
146 .operations
147 .into_iter()
148 .map(language::proto::deserialize_operation)
149 .collect::<Result<Vec<_>, _>>()?;
150
151 this.update(&mut cx, |this, cx| {
152 cx.notify();
153 this.buffer
154 .update(cx, |buffer, cx| buffer.apply_ops(ops, cx))
155 })??;
156
157 Ok(())
158 }
159
160 async fn handle_update_channel_buffer_collaborators(
161 this: Model<Self>,
162 message: TypedEnvelope<proto::UpdateChannelBufferCollaborators>,
163 _: Arc<Client>,
164 mut cx: AsyncAppContext,
165 ) -> Result<()> {
166 this.update(&mut cx, |this, cx| {
167 this.replace_collaborators(message.payload.collaborators, cx);
168 cx.emit(ChannelBufferEvent::CollaboratorsChanged);
169 cx.notify();
170 })
171 }
172
173 fn on_buffer_update(
174 &mut self,
175 _: Model<language::Buffer>,
176 event: &language::Event,
177 cx: &mut ModelContext<Self>,
178 ) {
179 match event {
180 language::Event::Operation(operation) => {
181 let operation = language::proto::serialize_operation(operation);
182 self.client
183 .send(proto::UpdateChannelBuffer {
184 channel_id: self.channel_id,
185 operations: vec![operation],
186 })
187 .log_err();
188 }
189 language::Event::Edited => {
190 cx.emit(ChannelBufferEvent::BufferEdited);
191 }
192 _ => {}
193 }
194 }
195
196 pub fn acknowledge_buffer_version(&mut self, cx: &mut ModelContext<'_, ChannelBuffer>) {
197 let buffer = self.buffer.read(cx);
198 let version = buffer.version();
199 let buffer_id = buffer.remote_id();
200 let client = self.client.clone();
201 let epoch = self.epoch();
202
203 self.acknowledge_task = Some(cx.spawn(move |_, cx| async move {
204 cx.background_executor()
205 .timer(ACKNOWLEDGE_DEBOUNCE_INTERVAL)
206 .await;
207 client
208 .send(proto::AckBufferOperation {
209 buffer_id,
210 epoch,
211 version: serialize_version(&version),
212 })
213 .ok();
214 Ok(())
215 }));
216 }
217
218 pub fn epoch(&self) -> u64 {
219 self.buffer_epoch
220 }
221
222 pub fn buffer(&self) -> Model<language::Buffer> {
223 self.buffer.clone()
224 }
225
226 pub fn collaborators(&self) -> &HashMap<PeerId, Collaborator> {
227 &self.collaborators
228 }
229
230 pub fn channel(&self, cx: &AppContext) -> Option<Arc<Channel>> {
231 self.channel_store
232 .read(cx)
233 .channel_for_id(self.channel_id)
234 .cloned()
235 }
236
237 pub(crate) fn disconnect(&mut self, cx: &mut ModelContext<Self>) {
238 log::info!("channel buffer {} disconnected", self.channel_id);
239 if self.connected {
240 self.connected = false;
241 self.subscription.take();
242 cx.emit(ChannelBufferEvent::Disconnected);
243 cx.notify()
244 }
245 }
246
247 pub(crate) fn channel_changed(&mut self, cx: &mut ModelContext<Self>) {
248 cx.emit(ChannelBufferEvent::ChannelChanged);
249 cx.notify()
250 }
251
252 pub fn is_connected(&self) -> bool {
253 self.connected
254 }
255
256 pub fn replica_id(&self, cx: &AppContext) -> u16 {
257 self.buffer.read(cx).replica_id()
258 }
259}