1mod store;
   2
   3use super::{
   4    auth,
   5    db::{ChannelId, MessageId, UserId},
   6    AppState,
   7};
   8use anyhow::anyhow;
   9use async_std::{sync::RwLock, task};
  10use async_tungstenite::{tungstenite::protocol::Role, WebSocketStream};
  11use futures::{future::BoxFuture, FutureExt};
  12use postage::{mpsc, prelude::Sink as _, prelude::Stream as _};
  13use sha1::{Digest as _, Sha1};
  14use std::{
  15    any::TypeId,
  16    collections::{HashMap, HashSet},
  17    future::Future,
  18    mem,
  19    sync::Arc,
  20    time::Instant,
  21};
  22use store::{JoinedWorktree, Store, Worktree};
  23use surf::StatusCode;
  24use tide::log;
  25use tide::{
  26    http::headers::{HeaderName, CONNECTION, UPGRADE},
  27    Request, Response,
  28};
  29use time::OffsetDateTime;
  30use zrpc::{
  31    proto::{self, AnyTypedEnvelope, EnvelopedMessage},
  32    Connection, ConnectionId, Peer, TypedEnvelope,
  33};
  34
  35type MessageHandler = Box<
  36    dyn Send
  37        + Sync
  38        + Fn(Arc<Server>, Box<dyn AnyTypedEnvelope>) -> BoxFuture<'static, tide::Result<()>>,
  39>;
  40
  41pub struct Server {
  42    peer: Arc<Peer>,
  43    store: RwLock<Store>,
  44    app_state: Arc<AppState>,
  45    handlers: HashMap<TypeId, MessageHandler>,
  46    notifications: Option<mpsc::Sender<()>>,
  47}
  48
  49const MESSAGE_COUNT_PER_PAGE: usize = 100;
  50const MAX_MESSAGE_LEN: usize = 1024;
  51
  52impl Server {
  53    pub fn new(
  54        app_state: Arc<AppState>,
  55        peer: Arc<Peer>,
  56        notifications: Option<mpsc::Sender<()>>,
  57    ) -> Arc<Self> {
  58        let mut server = Self {
  59            peer,
  60            app_state,
  61            store: Default::default(),
  62            handlers: Default::default(),
  63            notifications,
  64        };
  65
  66        server
  67            .add_handler(Server::ping)
  68            .add_handler(Server::open_worktree)
  69            .add_handler(Server::close_worktree)
  70            .add_handler(Server::share_worktree)
  71            .add_handler(Server::unshare_worktree)
  72            .add_handler(Server::join_worktree)
  73            .add_handler(Server::leave_worktree)
  74            .add_handler(Server::update_worktree)
  75            .add_handler(Server::open_buffer)
  76            .add_handler(Server::close_buffer)
  77            .add_handler(Server::update_buffer)
  78            .add_handler(Server::buffer_saved)
  79            .add_handler(Server::save_buffer)
  80            .add_handler(Server::get_channels)
  81            .add_handler(Server::get_users)
  82            .add_handler(Server::join_channel)
  83            .add_handler(Server::leave_channel)
  84            .add_handler(Server::send_channel_message)
  85            .add_handler(Server::get_channel_messages);
  86
  87        Arc::new(server)
  88    }
  89
  90    fn add_handler<F, Fut, M>(&mut self, handler: F) -> &mut Self
  91    where
  92        F: 'static + Send + Sync + Fn(Arc<Self>, TypedEnvelope<M>) -> Fut,
  93        Fut: 'static + Send + Future<Output = tide::Result<()>>,
  94        M: EnvelopedMessage,
  95    {
  96        let prev_handler = self.handlers.insert(
  97            TypeId::of::<M>(),
  98            Box::new(move |server, envelope| {
  99                let envelope = envelope.into_any().downcast::<TypedEnvelope<M>>().unwrap();
 100                (handler)(server, *envelope).boxed()
 101            }),
 102        );
 103        if prev_handler.is_some() {
 104            panic!("registered a handler for the same message twice");
 105        }
 106        self
 107    }
 108
 109    pub fn handle_connection(
 110        self: &Arc<Self>,
 111        connection: Connection,
 112        addr: String,
 113        user_id: UserId,
 114    ) -> impl Future<Output = ()> {
 115        let mut this = self.clone();
 116        async move {
 117            let (connection_id, handle_io, mut incoming_rx) =
 118                this.peer.add_connection(connection).await;
 119            this.state_mut()
 120                .await
 121                .add_connection(connection_id, user_id);
 122            if let Err(err) = this.update_collaborators_for_users(&[user_id]).await {
 123                log::error!("error updating collaborators for {:?}: {}", user_id, err);
 124            }
 125
 126            let handle_io = handle_io.fuse();
 127            futures::pin_mut!(handle_io);
 128            loop {
 129                let next_message = incoming_rx.recv().fuse();
 130                futures::pin_mut!(next_message);
 131                futures::select_biased! {
 132                    message = next_message => {
 133                        if let Some(message) = message {
 134                            let start_time = Instant::now();
 135                            log::info!("RPC message received: {}", message.payload_type_name());
 136                            if let Some(handler) = this.handlers.get(&message.payload_type_id()) {
 137                                if let Err(err) = (handler)(this.clone(), message).await {
 138                                    log::error!("error handling message: {:?}", err);
 139                                } else {
 140                                    log::info!("RPC message handled. duration:{:?}", start_time.elapsed());
 141                                }
 142
 143                                if let Some(mut notifications) = this.notifications.clone() {
 144                                    let _ = notifications.send(()).await;
 145                                }
 146                            } else {
 147                                log::warn!("unhandled message: {}", message.payload_type_name());
 148                            }
 149                        } else {
 150                            log::info!("rpc connection closed {:?}", addr);
 151                            break;
 152                        }
 153                    }
 154                    handle_io = handle_io => {
 155                        if let Err(err) = handle_io {
 156                            log::error!("error handling rpc connection {:?} - {:?}", addr, err);
 157                        }
 158                        break;
 159                    }
 160                }
 161            }
 162
 163            if let Err(err) = this.sign_out(connection_id).await {
 164                log::error!("error signing out connection {:?} - {:?}", addr, err);
 165            }
 166        }
 167    }
 168
 169    async fn sign_out(self: &mut Arc<Self>, connection_id: ConnectionId) -> tide::Result<()> {
 170        self.peer.disconnect(connection_id).await;
 171        let removed_connection = self.state_mut().await.remove_connection(connection_id)?;
 172
 173        for (worktree_id, worktree) in removed_connection.hosted_worktrees {
 174            if let Some(share) = worktree.share {
 175                broadcast(
 176                    connection_id,
 177                    share.guest_connection_ids.keys().copied().collect(),
 178                    |conn_id| {
 179                        self.peer
 180                            .send(conn_id, proto::UnshareWorktree { worktree_id })
 181                    },
 182                )
 183                .await?;
 184            }
 185        }
 186
 187        for (worktree_id, peer_ids) in removed_connection.guest_worktree_ids {
 188            broadcast(connection_id, peer_ids, |conn_id| {
 189                self.peer.send(
 190                    conn_id,
 191                    proto::RemovePeer {
 192                        worktree_id,
 193                        peer_id: connection_id.0,
 194                    },
 195                )
 196            })
 197            .await?;
 198        }
 199
 200        self.update_collaborators_for_users(removed_connection.collaborator_ids.iter())
 201            .await?;
 202
 203        Ok(())
 204    }
 205
 206    async fn ping(self: Arc<Server>, request: TypedEnvelope<proto::Ping>) -> tide::Result<()> {
 207        self.peer.respond(request.receipt(), proto::Ack {}).await?;
 208        Ok(())
 209    }
 210
 211    async fn open_worktree(
 212        mut self: Arc<Server>,
 213        request: TypedEnvelope<proto::OpenWorktree>,
 214    ) -> tide::Result<()> {
 215        let receipt = request.receipt();
 216        let host_user_id = self
 217            .state()
 218            .await
 219            .user_id_for_connection(request.sender_id)?;
 220
 221        let mut collaborator_user_ids = HashSet::new();
 222        collaborator_user_ids.insert(host_user_id);
 223        for github_login in request.payload.collaborator_logins {
 224            match self.app_state.db.create_user(&github_login, false).await {
 225                Ok(collaborator_user_id) => {
 226                    collaborator_user_ids.insert(collaborator_user_id);
 227                }
 228                Err(err) => {
 229                    let message = err.to_string();
 230                    self.peer
 231                        .respond_with_error(receipt, proto::Error { message })
 232                        .await?;
 233                    return Ok(());
 234                }
 235            }
 236        }
 237
 238        let collaborator_user_ids = collaborator_user_ids.into_iter().collect::<Vec<_>>();
 239        let worktree_id = self.state_mut().await.add_worktree(Worktree {
 240            host_connection_id: request.sender_id,
 241            collaborator_user_ids: collaborator_user_ids.clone(),
 242            root_name: request.payload.root_name,
 243            share: None,
 244        });
 245
 246        self.peer
 247            .respond(receipt, proto::OpenWorktreeResponse { worktree_id })
 248            .await?;
 249        self.update_collaborators_for_users(&collaborator_user_ids)
 250            .await?;
 251
 252        Ok(())
 253    }
 254
 255    async fn close_worktree(
 256        mut self: Arc<Server>,
 257        request: TypedEnvelope<proto::CloseWorktree>,
 258    ) -> tide::Result<()> {
 259        let worktree_id = request.payload.worktree_id;
 260        let worktree = self
 261            .state_mut()
 262            .await
 263            .remove_worktree(worktree_id, request.sender_id)?;
 264
 265        if let Some(share) = worktree.share {
 266            broadcast(
 267                request.sender_id,
 268                share.guest_connection_ids.keys().copied().collect(),
 269                |conn_id| {
 270                    self.peer
 271                        .send(conn_id, proto::UnshareWorktree { worktree_id })
 272                },
 273            )
 274            .await?;
 275        }
 276        self.update_collaborators_for_users(&worktree.collaborator_user_ids)
 277            .await?;
 278        Ok(())
 279    }
 280
 281    async fn share_worktree(
 282        mut self: Arc<Server>,
 283        mut request: TypedEnvelope<proto::ShareWorktree>,
 284    ) -> tide::Result<()> {
 285        let worktree = request
 286            .payload
 287            .worktree
 288            .as_mut()
 289            .ok_or_else(|| anyhow!("missing worktree"))?;
 290        let entries = mem::take(&mut worktree.entries)
 291            .into_iter()
 292            .map(|entry| (entry.id, entry))
 293            .collect();
 294
 295        let collaborator_user_ids =
 296            self.state_mut()
 297                .await
 298                .share_worktree(worktree.id, request.sender_id, entries);
 299        if let Some(collaborator_user_ids) = collaborator_user_ids {
 300            self.peer
 301                .respond(request.receipt(), proto::ShareWorktreeResponse {})
 302                .await?;
 303            self.update_collaborators_for_users(&collaborator_user_ids)
 304                .await?;
 305        } else {
 306            self.peer
 307                .respond_with_error(
 308                    request.receipt(),
 309                    proto::Error {
 310                        message: "no such worktree".to_string(),
 311                    },
 312                )
 313                .await?;
 314        }
 315        Ok(())
 316    }
 317
 318    async fn unshare_worktree(
 319        mut self: Arc<Server>,
 320        request: TypedEnvelope<proto::UnshareWorktree>,
 321    ) -> tide::Result<()> {
 322        let worktree_id = request.payload.worktree_id;
 323        let worktree = self
 324            .state_mut()
 325            .await
 326            .unshare_worktree(worktree_id, request.sender_id)?;
 327
 328        broadcast(request.sender_id, worktree.connection_ids, |conn_id| {
 329            self.peer
 330                .send(conn_id, proto::UnshareWorktree { worktree_id })
 331        })
 332        .await?;
 333        self.update_collaborators_for_users(&worktree.collaborator_ids)
 334            .await?;
 335
 336        Ok(())
 337    }
 338
 339    async fn join_worktree(
 340        mut self: Arc<Server>,
 341        request: TypedEnvelope<proto::JoinWorktree>,
 342    ) -> tide::Result<()> {
 343        let worktree_id = request.payload.worktree_id;
 344        let user_id = self
 345            .state()
 346            .await
 347            .user_id_for_connection(request.sender_id)?;
 348
 349        let mut state = self.state_mut().await;
 350        match state.join_worktree(request.sender_id, user_id, worktree_id) {
 351            Ok(JoinedWorktree {
 352                replica_id,
 353                worktree,
 354            }) => {
 355                let share = worktree.share()?;
 356                let peer_count = share.guest_connection_ids.len();
 357                let mut peers = Vec::with_capacity(peer_count);
 358                peers.push(proto::Peer {
 359                    peer_id: worktree.host_connection_id.0,
 360                    replica_id: 0,
 361                });
 362                for (peer_conn_id, peer_replica_id) in &share.guest_connection_ids {
 363                    if *peer_conn_id != request.sender_id {
 364                        peers.push(proto::Peer {
 365                            peer_id: peer_conn_id.0,
 366                            replica_id: *peer_replica_id as u32,
 367                        });
 368                    }
 369                }
 370                let response = proto::JoinWorktreeResponse {
 371                    worktree: Some(proto::Worktree {
 372                        id: worktree_id,
 373                        root_name: worktree.root_name.clone(),
 374                        entries: share.entries.values().cloned().collect(),
 375                    }),
 376                    replica_id: replica_id as u32,
 377                    peers,
 378                };
 379                let connection_ids = worktree.connection_ids();
 380                let collaborator_user_ids = worktree.collaborator_user_ids.clone();
 381                drop(state);
 382
 383                broadcast(request.sender_id, connection_ids, |conn_id| {
 384                    self.peer.send(
 385                        conn_id,
 386                        proto::AddPeer {
 387                            worktree_id,
 388                            peer: Some(proto::Peer {
 389                                peer_id: request.sender_id.0,
 390                                replica_id: response.replica_id,
 391                            }),
 392                        },
 393                    )
 394                })
 395                .await?;
 396                self.peer.respond(request.receipt(), response).await?;
 397                self.update_collaborators_for_users(&collaborator_user_ids)
 398                    .await?;
 399            }
 400            Err(error) => {
 401                drop(state);
 402                self.peer
 403                    .respond_with_error(
 404                        request.receipt(),
 405                        proto::Error {
 406                            message: error.to_string(),
 407                        },
 408                    )
 409                    .await?;
 410            }
 411        }
 412
 413        Ok(())
 414    }
 415
 416    async fn leave_worktree(
 417        mut self: Arc<Server>,
 418        request: TypedEnvelope<proto::LeaveWorktree>,
 419    ) -> tide::Result<()> {
 420        let sender_id = request.sender_id;
 421        let worktree_id = request.payload.worktree_id;
 422        let worktree = self
 423            .state_mut()
 424            .await
 425            .leave_worktree(sender_id, worktree_id);
 426        if let Some(worktree) = worktree {
 427            broadcast(sender_id, worktree.connection_ids, |conn_id| {
 428                self.peer.send(
 429                    conn_id,
 430                    proto::RemovePeer {
 431                        worktree_id,
 432                        peer_id: sender_id.0,
 433                    },
 434                )
 435            })
 436            .await?;
 437            self.update_collaborators_for_users(&worktree.collaborator_ids)
 438                .await?;
 439        }
 440        Ok(())
 441    }
 442
 443    async fn update_worktree(
 444        mut self: Arc<Server>,
 445        request: TypedEnvelope<proto::UpdateWorktree>,
 446    ) -> tide::Result<()> {
 447        let connection_ids = self.state_mut().await.update_worktree(
 448            request.sender_id,
 449            request.payload.worktree_id,
 450            &request.payload.removed_entries,
 451            &request.payload.updated_entries,
 452        )?;
 453
 454        broadcast(request.sender_id, connection_ids, |connection_id| {
 455            self.peer
 456                .forward_send(request.sender_id, connection_id, request.payload.clone())
 457        })
 458        .await?;
 459
 460        Ok(())
 461    }
 462
 463    async fn open_buffer(
 464        self: Arc<Server>,
 465        request: TypedEnvelope<proto::OpenBuffer>,
 466    ) -> tide::Result<()> {
 467        let receipt = request.receipt();
 468        let host_connection_id = self
 469            .state()
 470            .await
 471            .worktree_host_connection_id(request.sender_id, request.payload.worktree_id)?;
 472        let response = self
 473            .peer
 474            .forward_request(request.sender_id, host_connection_id, request.payload)
 475            .await?;
 476        self.peer.respond(receipt, response).await?;
 477        Ok(())
 478    }
 479
 480    async fn close_buffer(
 481        self: Arc<Server>,
 482        request: TypedEnvelope<proto::CloseBuffer>,
 483    ) -> tide::Result<()> {
 484        let host_connection_id = self
 485            .state()
 486            .await
 487            .worktree_host_connection_id(request.sender_id, request.payload.worktree_id)?;
 488        self.peer
 489            .forward_send(request.sender_id, host_connection_id, request.payload)
 490            .await?;
 491        Ok(())
 492    }
 493
 494    async fn save_buffer(
 495        self: Arc<Server>,
 496        request: TypedEnvelope<proto::SaveBuffer>,
 497    ) -> tide::Result<()> {
 498        let host;
 499        let guests;
 500        {
 501            let state = self.state().await;
 502            host = state
 503                .worktree_host_connection_id(request.sender_id, request.payload.worktree_id)?;
 504            guests = state
 505                .worktree_guest_connection_ids(request.sender_id, request.payload.worktree_id)?;
 506        }
 507
 508        let sender = request.sender_id;
 509        let receipt = request.receipt();
 510        let response = self
 511            .peer
 512            .forward_request(sender, host, request.payload.clone())
 513            .await?;
 514
 515        broadcast(host, guests, |conn_id| {
 516            let response = response.clone();
 517            let peer = &self.peer;
 518            async move {
 519                if conn_id == sender {
 520                    peer.respond(receipt, response).await
 521                } else {
 522                    peer.forward_send(host, conn_id, response).await
 523                }
 524            }
 525        })
 526        .await?;
 527
 528        Ok(())
 529    }
 530
 531    async fn update_buffer(
 532        self: Arc<Server>,
 533        request: TypedEnvelope<proto::UpdateBuffer>,
 534    ) -> tide::Result<()> {
 535        broadcast(
 536            request.sender_id,
 537            self.state()
 538                .await
 539                .worktree_connection_ids(request.sender_id, request.payload.worktree_id)?,
 540            |connection_id| {
 541                self.peer
 542                    .forward_send(request.sender_id, connection_id, request.payload.clone())
 543            },
 544        )
 545        .await?;
 546        self.peer.respond(request.receipt(), proto::Ack {}).await?;
 547        Ok(())
 548    }
 549
 550    async fn buffer_saved(
 551        self: Arc<Server>,
 552        request: TypedEnvelope<proto::BufferSaved>,
 553    ) -> tide::Result<()> {
 554        broadcast(
 555            request.sender_id,
 556            self.store
 557                .read()
 558                .await
 559                .worktree_connection_ids(request.sender_id, request.payload.worktree_id)?,
 560            |connection_id| {
 561                self.peer
 562                    .forward_send(request.sender_id, connection_id, request.payload.clone())
 563            },
 564        )
 565        .await?;
 566        Ok(())
 567    }
 568
 569    async fn get_channels(
 570        self: Arc<Server>,
 571        request: TypedEnvelope<proto::GetChannels>,
 572    ) -> tide::Result<()> {
 573        let user_id = self
 574            .state()
 575            .await
 576            .user_id_for_connection(request.sender_id)?;
 577        let channels = self.app_state.db.get_accessible_channels(user_id).await?;
 578        self.peer
 579            .respond(
 580                request.receipt(),
 581                proto::GetChannelsResponse {
 582                    channels: channels
 583                        .into_iter()
 584                        .map(|chan| proto::Channel {
 585                            id: chan.id.to_proto(),
 586                            name: chan.name,
 587                        })
 588                        .collect(),
 589                },
 590            )
 591            .await?;
 592        Ok(())
 593    }
 594
 595    async fn get_users(
 596        self: Arc<Server>,
 597        request: TypedEnvelope<proto::GetUsers>,
 598    ) -> tide::Result<()> {
 599        let receipt = request.receipt();
 600        let user_ids = request.payload.user_ids.into_iter().map(UserId::from_proto);
 601        let users = self
 602            .app_state
 603            .db
 604            .get_users_by_ids(user_ids)
 605            .await?
 606            .into_iter()
 607            .map(|user| proto::User {
 608                id: user.id.to_proto(),
 609                avatar_url: format!("https://github.com/{}.png?size=128", user.github_login),
 610                github_login: user.github_login,
 611            })
 612            .collect();
 613        self.peer
 614            .respond(receipt, proto::GetUsersResponse { users })
 615            .await?;
 616        Ok(())
 617    }
 618
 619    async fn update_collaborators_for_users<'a>(
 620        self: &Arc<Server>,
 621        user_ids: impl IntoIterator<Item = &'a UserId>,
 622    ) -> tide::Result<()> {
 623        let mut send_futures = Vec::new();
 624
 625        let state = self.state().await;
 626        for user_id in user_ids {
 627            let collaborators = state.collaborators_for_user(*user_id);
 628            for connection_id in state.connection_ids_for_user(*user_id) {
 629                send_futures.push(self.peer.send(
 630                    connection_id,
 631                    proto::UpdateCollaborators {
 632                        collaborators: collaborators.clone(),
 633                    },
 634                ));
 635            }
 636        }
 637
 638        drop(state);
 639        futures::future::try_join_all(send_futures).await?;
 640
 641        Ok(())
 642    }
 643
 644    async fn join_channel(
 645        mut self: Arc<Self>,
 646        request: TypedEnvelope<proto::JoinChannel>,
 647    ) -> tide::Result<()> {
 648        let user_id = self
 649            .state()
 650            .await
 651            .user_id_for_connection(request.sender_id)?;
 652        let channel_id = ChannelId::from_proto(request.payload.channel_id);
 653        if !self
 654            .app_state
 655            .db
 656            .can_user_access_channel(user_id, channel_id)
 657            .await?
 658        {
 659            Err(anyhow!("access denied"))?;
 660        }
 661
 662        self.state_mut()
 663            .await
 664            .join_channel(request.sender_id, channel_id);
 665        let messages = self
 666            .app_state
 667            .db
 668            .get_channel_messages(channel_id, MESSAGE_COUNT_PER_PAGE, None)
 669            .await?
 670            .into_iter()
 671            .map(|msg| proto::ChannelMessage {
 672                id: msg.id.to_proto(),
 673                body: msg.body,
 674                timestamp: msg.sent_at.unix_timestamp() as u64,
 675                sender_id: msg.sender_id.to_proto(),
 676                nonce: Some(msg.nonce.as_u128().into()),
 677            })
 678            .collect::<Vec<_>>();
 679        self.peer
 680            .respond(
 681                request.receipt(),
 682                proto::JoinChannelResponse {
 683                    done: messages.len() < MESSAGE_COUNT_PER_PAGE,
 684                    messages,
 685                },
 686            )
 687            .await?;
 688        Ok(())
 689    }
 690
 691    async fn leave_channel(
 692        mut self: Arc<Self>,
 693        request: TypedEnvelope<proto::LeaveChannel>,
 694    ) -> tide::Result<()> {
 695        let user_id = self
 696            .state()
 697            .await
 698            .user_id_for_connection(request.sender_id)?;
 699        let channel_id = ChannelId::from_proto(request.payload.channel_id);
 700        if !self
 701            .app_state
 702            .db
 703            .can_user_access_channel(user_id, channel_id)
 704            .await?
 705        {
 706            Err(anyhow!("access denied"))?;
 707        }
 708
 709        self.state_mut()
 710            .await
 711            .leave_channel(request.sender_id, channel_id);
 712
 713        Ok(())
 714    }
 715
 716    async fn send_channel_message(
 717        self: Arc<Self>,
 718        request: TypedEnvelope<proto::SendChannelMessage>,
 719    ) -> tide::Result<()> {
 720        let receipt = request.receipt();
 721        let channel_id = ChannelId::from_proto(request.payload.channel_id);
 722        let user_id;
 723        let connection_ids;
 724        {
 725            let state = self.state().await;
 726            user_id = state.user_id_for_connection(request.sender_id)?;
 727            if let Some(ids) = state.channel_connection_ids(channel_id) {
 728                connection_ids = ids;
 729            } else {
 730                return Ok(());
 731            }
 732        }
 733
 734        // Validate the message body.
 735        let body = request.payload.body.trim().to_string();
 736        if body.len() > MAX_MESSAGE_LEN {
 737            self.peer
 738                .respond_with_error(
 739                    receipt,
 740                    proto::Error {
 741                        message: "message is too long".to_string(),
 742                    },
 743                )
 744                .await?;
 745            return Ok(());
 746        }
 747        if body.is_empty() {
 748            self.peer
 749                .respond_with_error(
 750                    receipt,
 751                    proto::Error {
 752                        message: "message can't be blank".to_string(),
 753                    },
 754                )
 755                .await?;
 756            return Ok(());
 757        }
 758
 759        let timestamp = OffsetDateTime::now_utc();
 760        let nonce = if let Some(nonce) = request.payload.nonce {
 761            nonce
 762        } else {
 763            self.peer
 764                .respond_with_error(
 765                    receipt,
 766                    proto::Error {
 767                        message: "nonce can't be blank".to_string(),
 768                    },
 769                )
 770                .await?;
 771            return Ok(());
 772        };
 773
 774        let message_id = self
 775            .app_state
 776            .db
 777            .create_channel_message(channel_id, user_id, &body, timestamp, nonce.clone().into())
 778            .await?
 779            .to_proto();
 780        let message = proto::ChannelMessage {
 781            sender_id: user_id.to_proto(),
 782            id: message_id,
 783            body,
 784            timestamp: timestamp.unix_timestamp() as u64,
 785            nonce: Some(nonce),
 786        };
 787        broadcast(request.sender_id, connection_ids, |conn_id| {
 788            self.peer.send(
 789                conn_id,
 790                proto::ChannelMessageSent {
 791                    channel_id: channel_id.to_proto(),
 792                    message: Some(message.clone()),
 793                },
 794            )
 795        })
 796        .await?;
 797        self.peer
 798            .respond(
 799                receipt,
 800                proto::SendChannelMessageResponse {
 801                    message: Some(message),
 802                },
 803            )
 804            .await?;
 805        Ok(())
 806    }
 807
 808    async fn get_channel_messages(
 809        self: Arc<Self>,
 810        request: TypedEnvelope<proto::GetChannelMessages>,
 811    ) -> tide::Result<()> {
 812        let user_id = self
 813            .state()
 814            .await
 815            .user_id_for_connection(request.sender_id)?;
 816        let channel_id = ChannelId::from_proto(request.payload.channel_id);
 817        if !self
 818            .app_state
 819            .db
 820            .can_user_access_channel(user_id, channel_id)
 821            .await?
 822        {
 823            Err(anyhow!("access denied"))?;
 824        }
 825
 826        let messages = self
 827            .app_state
 828            .db
 829            .get_channel_messages(
 830                channel_id,
 831                MESSAGE_COUNT_PER_PAGE,
 832                Some(MessageId::from_proto(request.payload.before_message_id)),
 833            )
 834            .await?
 835            .into_iter()
 836            .map(|msg| proto::ChannelMessage {
 837                id: msg.id.to_proto(),
 838                body: msg.body,
 839                timestamp: msg.sent_at.unix_timestamp() as u64,
 840                sender_id: msg.sender_id.to_proto(),
 841                nonce: Some(msg.nonce.as_u128().into()),
 842            })
 843            .collect::<Vec<_>>();
 844        self.peer
 845            .respond(
 846                request.receipt(),
 847                proto::GetChannelMessagesResponse {
 848                    done: messages.len() < MESSAGE_COUNT_PER_PAGE,
 849                    messages,
 850                },
 851            )
 852            .await?;
 853        Ok(())
 854    }
 855
 856    fn state<'a>(
 857        self: &'a Arc<Self>,
 858    ) -> impl Future<Output = async_std::sync::RwLockReadGuard<'a, Store>> {
 859        self.store.read()
 860    }
 861
 862    fn state_mut<'a>(
 863        self: &'a mut Arc<Self>,
 864    ) -> impl Future<Output = async_std::sync::RwLockWriteGuard<'a, Store>> {
 865        self.store.write()
 866    }
 867}
 868
 869pub async fn broadcast<F, T>(
 870    sender_id: ConnectionId,
 871    receiver_ids: Vec<ConnectionId>,
 872    mut f: F,
 873) -> anyhow::Result<()>
 874where
 875    F: FnMut(ConnectionId) -> T,
 876    T: Future<Output = anyhow::Result<()>>,
 877{
 878    let futures = receiver_ids
 879        .into_iter()
 880        .filter(|id| *id != sender_id)
 881        .map(|id| f(id));
 882    futures::future::try_join_all(futures).await?;
 883    Ok(())
 884}
 885
 886pub fn add_routes(app: &mut tide::Server<Arc<AppState>>, rpc: &Arc<Peer>) {
 887    let server = Server::new(app.state().clone(), rpc.clone(), None);
 888    app.at("/rpc").with(auth::VerifyToken).get(move |request: Request<Arc<AppState>>| {
 889        let user_id = request.ext::<UserId>().copied();
 890        let server = server.clone();
 891        async move {
 892            const WEBSOCKET_GUID: &str = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 893
 894            let connection_upgrade = header_contains_ignore_case(&request, CONNECTION, "upgrade");
 895            let upgrade_to_websocket = header_contains_ignore_case(&request, UPGRADE, "websocket");
 896            let upgrade_requested = connection_upgrade && upgrade_to_websocket;
 897
 898            if !upgrade_requested {
 899                return Ok(Response::new(StatusCode::UpgradeRequired));
 900            }
 901
 902            let header = match request.header("Sec-Websocket-Key") {
 903                Some(h) => h.as_str(),
 904                None => return Err(anyhow!("expected sec-websocket-key"))?,
 905            };
 906
 907            let mut response = Response::new(StatusCode::SwitchingProtocols);
 908            response.insert_header(UPGRADE, "websocket");
 909            response.insert_header(CONNECTION, "Upgrade");
 910            let hash = Sha1::new().chain(header).chain(WEBSOCKET_GUID).finalize();
 911            response.insert_header("Sec-Websocket-Accept", base64::encode(&hash[..]));
 912            response.insert_header("Sec-Websocket-Version", "13");
 913
 914            let http_res: &mut tide::http::Response = response.as_mut();
 915            let upgrade_receiver = http_res.recv_upgrade().await;
 916            let addr = request.remote().unwrap_or("unknown").to_string();
 917            let user_id = user_id.ok_or_else(|| anyhow!("user_id is not present on request. ensure auth::VerifyToken middleware is present"))?;
 918            task::spawn(async move {
 919                if let Some(stream) = upgrade_receiver.await {
 920                    server.handle_connection(Connection::new(WebSocketStream::from_raw_socket(stream, Role::Server, None).await), addr, user_id).await;
 921                }
 922            });
 923
 924            Ok(response)
 925        }
 926    });
 927}
 928
 929fn header_contains_ignore_case<T>(
 930    request: &tide::Request<T>,
 931    header_name: HeaderName,
 932    value: &str,
 933) -> bool {
 934    request
 935        .header(header_name)
 936        .map(|h| {
 937            h.as_str()
 938                .split(',')
 939                .any(|s| s.trim().eq_ignore_ascii_case(value.trim()))
 940        })
 941        .unwrap_or(false)
 942}
 943
 944#[cfg(test)]
 945mod tests {
 946    use super::*;
 947    use crate::{
 948        auth,
 949        db::{tests::TestDb, UserId},
 950        github, AppState, Config,
 951    };
 952    use async_std::{sync::RwLockReadGuard, task};
 953    use gpui::{ModelHandle, TestAppContext};
 954    use parking_lot::Mutex;
 955    use postage::{mpsc, watch};
 956    use serde_json::json;
 957    use sqlx::types::time::OffsetDateTime;
 958    use std::{
 959        path::Path,
 960        sync::{
 961            atomic::{AtomicBool, Ordering::SeqCst},
 962            Arc,
 963        },
 964        time::Duration,
 965    };
 966    use zed::{
 967        channel::{Channel, ChannelDetails, ChannelList},
 968        editor::{Editor, EditorStyle, Insert},
 969        fs::{FakeFs, Fs as _},
 970        language::LanguageRegistry,
 971        rpc::{self, Client, Credentials, EstablishConnectionError},
 972        settings,
 973        test::FakeHttpClient,
 974        user::UserStore,
 975        worktree::Worktree,
 976    };
 977    use zrpc::Peer;
 978
 979    #[gpui::test]
 980    async fn test_share_worktree(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
 981        let (window_b, _) = cx_b.add_window(|_| EmptyView);
 982        let settings = cx_b.read(settings::test).1;
 983        let lang_registry = Arc::new(LanguageRegistry::new());
 984
 985        // Connect to a server as 2 clients.
 986        let mut server = TestServer::start().await;
 987        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
 988        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
 989
 990        cx_a.foreground().forbid_parking();
 991
 992        // Share a local worktree as client A
 993        let fs = Arc::new(FakeFs::new());
 994        fs.insert_tree(
 995            "/a",
 996            json!({
 997                ".zed.toml": r#"collaborators = ["user_b"]"#,
 998                "a.txt": "a-contents",
 999                "b.txt": "b-contents",
1000            }),
1001        )
1002        .await;
1003        let worktree_a = Worktree::open_local(
1004            client_a.clone(),
1005            "/a".as_ref(),
1006            fs,
1007            lang_registry.clone(),
1008            &mut cx_a.to_async(),
1009        )
1010        .await
1011        .unwrap();
1012        worktree_a
1013            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1014            .await;
1015        let worktree_id = worktree_a
1016            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1017            .await
1018            .unwrap();
1019
1020        // Join that worktree as client B, and see that a guest has joined as client A.
1021        let worktree_b = Worktree::open_remote(
1022            client_b.clone(),
1023            worktree_id,
1024            lang_registry.clone(),
1025            &mut cx_b.to_async(),
1026        )
1027        .await
1028        .unwrap();
1029        let replica_id_b = worktree_b.read_with(&cx_b, |tree, _| tree.replica_id());
1030        worktree_a
1031            .condition(&cx_a, |tree, _| {
1032                tree.peers()
1033                    .values()
1034                    .any(|replica_id| *replica_id == replica_id_b)
1035            })
1036            .await;
1037
1038        // Open the same file as client B and client A.
1039        let buffer_b = worktree_b
1040            .update(&mut cx_b, |worktree, cx| worktree.open_buffer("b.txt", cx))
1041            .await
1042            .unwrap();
1043        buffer_b.read_with(&cx_b, |buf, _| assert_eq!(buf.text(), "b-contents"));
1044        worktree_a.read_with(&cx_a, |tree, cx| assert!(tree.has_open_buffer("b.txt", cx)));
1045        let buffer_a = worktree_a
1046            .update(&mut cx_a, |tree, cx| tree.open_buffer("b.txt", cx))
1047            .await
1048            .unwrap();
1049
1050        // Create a selection set as client B and see that selection set as client A.
1051        let editor_b = cx_b.add_view(window_b, |cx| {
1052            Editor::for_buffer(
1053                buffer_b,
1054                settings,
1055                |cx| EditorStyle::test(cx.font_cache()),
1056                cx,
1057            )
1058        });
1059        buffer_a
1060            .condition(&cx_a, |buffer, _| buffer.selection_sets().count() == 1)
1061            .await;
1062
1063        // Edit the buffer as client B and see that edit as client A.
1064        editor_b.update(&mut cx_b, |editor, cx| {
1065            editor.insert(&Insert("ok, ".into()), cx)
1066        });
1067        buffer_a
1068            .condition(&cx_a, |buffer, _| buffer.text() == "ok, b-contents")
1069            .await;
1070
1071        // Remove the selection set as client B, see those selections disappear as client A.
1072        cx_b.update(move |_| drop(editor_b));
1073        buffer_a
1074            .condition(&cx_a, |buffer, _| buffer.selection_sets().count() == 0)
1075            .await;
1076
1077        // Close the buffer as client A, see that the buffer is closed.
1078        cx_a.update(move |_| drop(buffer_a));
1079        worktree_a
1080            .condition(&cx_a, |tree, cx| !tree.has_open_buffer("b.txt", cx))
1081            .await;
1082
1083        // Dropping the worktree removes client B from client A's peers.
1084        cx_b.update(move |_| drop(worktree_b));
1085        worktree_a
1086            .condition(&cx_a, |tree, _| tree.peers().is_empty())
1087            .await;
1088    }
1089
1090    #[gpui::test]
1091    async fn test_propagate_saves_and_fs_changes_in_shared_worktree(
1092        mut cx_a: TestAppContext,
1093        mut cx_b: TestAppContext,
1094        mut cx_c: TestAppContext,
1095    ) {
1096        cx_a.foreground().forbid_parking();
1097        let lang_registry = Arc::new(LanguageRegistry::new());
1098
1099        // Connect to a server as 3 clients.
1100        let mut server = TestServer::start().await;
1101        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1102        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
1103        let (client_c, _) = server.create_client(&mut cx_c, "user_c").await;
1104
1105        let fs = Arc::new(FakeFs::new());
1106
1107        // Share a worktree as client A.
1108        fs.insert_tree(
1109            "/a",
1110            json!({
1111                ".zed.toml": r#"collaborators = ["user_b", "user_c"]"#,
1112                "file1": "",
1113                "file2": ""
1114            }),
1115        )
1116        .await;
1117
1118        let worktree_a = Worktree::open_local(
1119            client_a.clone(),
1120            "/a".as_ref(),
1121            fs.clone(),
1122            lang_registry.clone(),
1123            &mut cx_a.to_async(),
1124        )
1125        .await
1126        .unwrap();
1127        worktree_a
1128            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1129            .await;
1130        let worktree_id = worktree_a
1131            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1132            .await
1133            .unwrap();
1134
1135        // Join that worktree as clients B and C.
1136        let worktree_b = Worktree::open_remote(
1137            client_b.clone(),
1138            worktree_id,
1139            lang_registry.clone(),
1140            &mut cx_b.to_async(),
1141        )
1142        .await
1143        .unwrap();
1144        let worktree_c = Worktree::open_remote(
1145            client_c.clone(),
1146            worktree_id,
1147            lang_registry.clone(),
1148            &mut cx_c.to_async(),
1149        )
1150        .await
1151        .unwrap();
1152
1153        // Open and edit a buffer as both guests B and C.
1154        let buffer_b = worktree_b
1155            .update(&mut cx_b, |tree, cx| tree.open_buffer("file1", cx))
1156            .await
1157            .unwrap();
1158        let buffer_c = worktree_c
1159            .update(&mut cx_c, |tree, cx| tree.open_buffer("file1", cx))
1160            .await
1161            .unwrap();
1162        buffer_b.update(&mut cx_b, |buf, cx| buf.edit([0..0], "i-am-b, ", cx));
1163        buffer_c.update(&mut cx_c, |buf, cx| buf.edit([0..0], "i-am-c, ", cx));
1164
1165        // Open and edit that buffer as the host.
1166        let buffer_a = worktree_a
1167            .update(&mut cx_a, |tree, cx| tree.open_buffer("file1", cx))
1168            .await
1169            .unwrap();
1170
1171        buffer_a
1172            .condition(&mut cx_a, |buf, _| buf.text() == "i-am-c, i-am-b, ")
1173            .await;
1174        buffer_a.update(&mut cx_a, |buf, cx| {
1175            buf.edit([buf.len()..buf.len()], "i-am-a", cx)
1176        });
1177
1178        // Wait for edits to propagate
1179        buffer_a
1180            .condition(&mut cx_a, |buf, _| buf.text() == "i-am-c, i-am-b, i-am-a")
1181            .await;
1182        buffer_b
1183            .condition(&mut cx_b, |buf, _| buf.text() == "i-am-c, i-am-b, i-am-a")
1184            .await;
1185        buffer_c
1186            .condition(&mut cx_c, |buf, _| buf.text() == "i-am-c, i-am-b, i-am-a")
1187            .await;
1188
1189        // Edit the buffer as the host and concurrently save as guest B.
1190        let save_b = buffer_b.update(&mut cx_b, |buf, cx| buf.save(cx).unwrap());
1191        buffer_a.update(&mut cx_a, |buf, cx| buf.edit([0..0], "hi-a, ", cx));
1192        save_b.await.unwrap();
1193        assert_eq!(
1194            fs.load("/a/file1".as_ref()).await.unwrap(),
1195            "hi-a, i-am-c, i-am-b, i-am-a"
1196        );
1197        buffer_a.read_with(&cx_a, |buf, _| assert!(!buf.is_dirty()));
1198        buffer_b.read_with(&cx_b, |buf, _| assert!(!buf.is_dirty()));
1199        buffer_c.condition(&cx_c, |buf, _| !buf.is_dirty()).await;
1200
1201        // Make changes on host's file system, see those changes on the guests.
1202        fs.rename("/a/file2".as_ref(), "/a/file3".as_ref())
1203            .await
1204            .unwrap();
1205        fs.insert_file(Path::new("/a/file4"), "4".into())
1206            .await
1207            .unwrap();
1208
1209        worktree_b
1210            .condition(&cx_b, |tree, _| tree.file_count() == 4)
1211            .await;
1212        worktree_c
1213            .condition(&cx_c, |tree, _| tree.file_count() == 4)
1214            .await;
1215        worktree_b.read_with(&cx_b, |tree, _| {
1216            assert_eq!(
1217                tree.paths()
1218                    .map(|p| p.to_string_lossy())
1219                    .collect::<Vec<_>>(),
1220                &[".zed.toml", "file1", "file3", "file4"]
1221            )
1222        });
1223        worktree_c.read_with(&cx_c, |tree, _| {
1224            assert_eq!(
1225                tree.paths()
1226                    .map(|p| p.to_string_lossy())
1227                    .collect::<Vec<_>>(),
1228                &[".zed.toml", "file1", "file3", "file4"]
1229            )
1230        });
1231    }
1232
1233    #[gpui::test]
1234    async fn test_buffer_conflict_after_save(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
1235        cx_a.foreground().forbid_parking();
1236        let lang_registry = Arc::new(LanguageRegistry::new());
1237
1238        // Connect to a server as 2 clients.
1239        let mut server = TestServer::start().await;
1240        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1241        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
1242
1243        // Share a local worktree as client A
1244        let fs = Arc::new(FakeFs::new());
1245        fs.insert_tree(
1246            "/dir",
1247            json!({
1248                ".zed.toml": r#"collaborators = ["user_b", "user_c"]"#,
1249                "a.txt": "a-contents",
1250            }),
1251        )
1252        .await;
1253
1254        let worktree_a = Worktree::open_local(
1255            client_a.clone(),
1256            "/dir".as_ref(),
1257            fs,
1258            lang_registry.clone(),
1259            &mut cx_a.to_async(),
1260        )
1261        .await
1262        .unwrap();
1263        worktree_a
1264            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1265            .await;
1266        let worktree_id = worktree_a
1267            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1268            .await
1269            .unwrap();
1270
1271        // Join that worktree as client B, and see that a guest has joined as client A.
1272        let worktree_b = Worktree::open_remote(
1273            client_b.clone(),
1274            worktree_id,
1275            lang_registry.clone(),
1276            &mut cx_b.to_async(),
1277        )
1278        .await
1279        .unwrap();
1280
1281        let buffer_b = worktree_b
1282            .update(&mut cx_b, |worktree, cx| worktree.open_buffer("a.txt", cx))
1283            .await
1284            .unwrap();
1285        let mtime = buffer_b.read_with(&cx_b, |buf, _| buf.file().unwrap().mtime);
1286
1287        buffer_b.update(&mut cx_b, |buf, cx| buf.edit([0..0], "world ", cx));
1288        buffer_b.read_with(&cx_b, |buf, _| {
1289            assert!(buf.is_dirty());
1290            assert!(!buf.has_conflict());
1291        });
1292
1293        buffer_b
1294            .update(&mut cx_b, |buf, cx| buf.save(cx))
1295            .unwrap()
1296            .await
1297            .unwrap();
1298        worktree_b
1299            .condition(&cx_b, |_, cx| {
1300                buffer_b.read(cx).file().unwrap().mtime != mtime
1301            })
1302            .await;
1303        buffer_b.read_with(&cx_b, |buf, _| {
1304            assert!(!buf.is_dirty());
1305            assert!(!buf.has_conflict());
1306        });
1307
1308        buffer_b.update(&mut cx_b, |buf, cx| buf.edit([0..0], "hello ", cx));
1309        buffer_b.read_with(&cx_b, |buf, _| {
1310            assert!(buf.is_dirty());
1311            assert!(!buf.has_conflict());
1312        });
1313    }
1314
1315    #[gpui::test]
1316    async fn test_editing_while_guest_opens_buffer(
1317        mut cx_a: TestAppContext,
1318        mut cx_b: TestAppContext,
1319    ) {
1320        cx_a.foreground().forbid_parking();
1321        let lang_registry = Arc::new(LanguageRegistry::new());
1322
1323        // Connect to a server as 2 clients.
1324        let mut server = TestServer::start().await;
1325        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1326        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
1327
1328        // Share a local worktree as client A
1329        let fs = Arc::new(FakeFs::new());
1330        fs.insert_tree(
1331            "/dir",
1332            json!({
1333                ".zed.toml": r#"collaborators = ["user_b"]"#,
1334                "a.txt": "a-contents",
1335            }),
1336        )
1337        .await;
1338        let worktree_a = Worktree::open_local(
1339            client_a.clone(),
1340            "/dir".as_ref(),
1341            fs,
1342            lang_registry.clone(),
1343            &mut cx_a.to_async(),
1344        )
1345        .await
1346        .unwrap();
1347        worktree_a
1348            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1349            .await;
1350        let worktree_id = worktree_a
1351            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1352            .await
1353            .unwrap();
1354
1355        // Join that worktree as client B, and see that a guest has joined as client A.
1356        let worktree_b = Worktree::open_remote(
1357            client_b.clone(),
1358            worktree_id,
1359            lang_registry.clone(),
1360            &mut cx_b.to_async(),
1361        )
1362        .await
1363        .unwrap();
1364
1365        let buffer_a = worktree_a
1366            .update(&mut cx_a, |tree, cx| tree.open_buffer("a.txt", cx))
1367            .await
1368            .unwrap();
1369        let buffer_b = cx_b
1370            .background()
1371            .spawn(worktree_b.update(&mut cx_b, |worktree, cx| worktree.open_buffer("a.txt", cx)));
1372
1373        task::yield_now().await;
1374        buffer_a.update(&mut cx_a, |buf, cx| buf.edit([0..0], "z", cx));
1375
1376        let text = buffer_a.read_with(&cx_a, |buf, _| buf.text());
1377        let buffer_b = buffer_b.await.unwrap();
1378        buffer_b.condition(&cx_b, |buf, _| buf.text() == text).await;
1379    }
1380
1381    #[gpui::test]
1382    async fn test_peer_disconnection(mut cx_a: TestAppContext, cx_b: TestAppContext) {
1383        cx_a.foreground().forbid_parking();
1384        let lang_registry = Arc::new(LanguageRegistry::new());
1385
1386        // Connect to a server as 2 clients.
1387        let mut server = TestServer::start().await;
1388        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1389        let (client_b, _) = server.create_client(&mut cx_a, "user_b").await;
1390
1391        // Share a local worktree as client A
1392        let fs = Arc::new(FakeFs::new());
1393        fs.insert_tree(
1394            "/a",
1395            json!({
1396                ".zed.toml": r#"collaborators = ["user_b"]"#,
1397                "a.txt": "a-contents",
1398                "b.txt": "b-contents",
1399            }),
1400        )
1401        .await;
1402        let worktree_a = Worktree::open_local(
1403            client_a.clone(),
1404            "/a".as_ref(),
1405            fs,
1406            lang_registry.clone(),
1407            &mut cx_a.to_async(),
1408        )
1409        .await
1410        .unwrap();
1411        worktree_a
1412            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1413            .await;
1414        let worktree_id = worktree_a
1415            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1416            .await
1417            .unwrap();
1418
1419        // Join that worktree as client B, and see that a guest has joined as client A.
1420        let _worktree_b = Worktree::open_remote(
1421            client_b.clone(),
1422            worktree_id,
1423            lang_registry.clone(),
1424            &mut cx_b.to_async(),
1425        )
1426        .await
1427        .unwrap();
1428        worktree_a
1429            .condition(&cx_a, |tree, _| tree.peers().len() == 1)
1430            .await;
1431
1432        // Drop client B's connection and ensure client A observes client B leaving the worktree.
1433        client_b.disconnect(&cx_b.to_async()).await.unwrap();
1434        worktree_a
1435            .condition(&cx_a, |tree, _| tree.peers().len() == 0)
1436            .await;
1437    }
1438
1439    #[gpui::test]
1440    async fn test_basic_chat(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
1441        cx_a.foreground().forbid_parking();
1442
1443        // Connect to a server as 2 clients.
1444        let mut server = TestServer::start().await;
1445        let (client_a, user_store_a) = server.create_client(&mut cx_a, "user_a").await;
1446        let (client_b, user_store_b) = server.create_client(&mut cx_b, "user_b").await;
1447
1448        // Create an org that includes these 2 users.
1449        let db = &server.app_state.db;
1450        let org_id = db.create_org("Test Org", "test-org").await.unwrap();
1451        db.add_org_member(org_id, current_user_id(&user_store_a, &cx_a), false)
1452            .await
1453            .unwrap();
1454        db.add_org_member(org_id, current_user_id(&user_store_b, &cx_b), false)
1455            .await
1456            .unwrap();
1457
1458        // Create a channel that includes all the users.
1459        let channel_id = db.create_org_channel(org_id, "test-channel").await.unwrap();
1460        db.add_channel_member(channel_id, current_user_id(&user_store_a, &cx_a), false)
1461            .await
1462            .unwrap();
1463        db.add_channel_member(channel_id, current_user_id(&user_store_b, &cx_b), false)
1464            .await
1465            .unwrap();
1466        db.create_channel_message(
1467            channel_id,
1468            current_user_id(&user_store_b, &cx_b),
1469            "hello A, it's B.",
1470            OffsetDateTime::now_utc(),
1471            1,
1472        )
1473        .await
1474        .unwrap();
1475
1476        let channels_a = cx_a.add_model(|cx| ChannelList::new(user_store_a, client_a, cx));
1477        channels_a
1478            .condition(&mut cx_a, |list, _| list.available_channels().is_some())
1479            .await;
1480        channels_a.read_with(&cx_a, |list, _| {
1481            assert_eq!(
1482                list.available_channels().unwrap(),
1483                &[ChannelDetails {
1484                    id: channel_id.to_proto(),
1485                    name: "test-channel".to_string()
1486                }]
1487            )
1488        });
1489        let channel_a = channels_a.update(&mut cx_a, |this, cx| {
1490            this.get_channel(channel_id.to_proto(), cx).unwrap()
1491        });
1492        channel_a.read_with(&cx_a, |channel, _| assert!(channel.messages().is_empty()));
1493        channel_a
1494            .condition(&cx_a, |channel, _| {
1495                channel_messages(channel)
1496                    == [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1497            })
1498            .await;
1499
1500        let channels_b = cx_b.add_model(|cx| ChannelList::new(user_store_b, client_b, cx));
1501        channels_b
1502            .condition(&mut cx_b, |list, _| list.available_channels().is_some())
1503            .await;
1504        channels_b.read_with(&cx_b, |list, _| {
1505            assert_eq!(
1506                list.available_channels().unwrap(),
1507                &[ChannelDetails {
1508                    id: channel_id.to_proto(),
1509                    name: "test-channel".to_string()
1510                }]
1511            )
1512        });
1513
1514        let channel_b = channels_b.update(&mut cx_b, |this, cx| {
1515            this.get_channel(channel_id.to_proto(), cx).unwrap()
1516        });
1517        channel_b.read_with(&cx_b, |channel, _| assert!(channel.messages().is_empty()));
1518        channel_b
1519            .condition(&cx_b, |channel, _| {
1520                channel_messages(channel)
1521                    == [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1522            })
1523            .await;
1524
1525        channel_a
1526            .update(&mut cx_a, |channel, cx| {
1527                channel
1528                    .send_message("oh, hi B.".to_string(), cx)
1529                    .unwrap()
1530                    .detach();
1531                let task = channel.send_message("sup".to_string(), cx).unwrap();
1532                assert_eq!(
1533                    channel_messages(channel),
1534                    &[
1535                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1536                        ("user_a".to_string(), "oh, hi B.".to_string(), true),
1537                        ("user_a".to_string(), "sup".to_string(), true)
1538                    ]
1539                );
1540                task
1541            })
1542            .await
1543            .unwrap();
1544
1545        channel_b
1546            .condition(&cx_b, |channel, _| {
1547                channel_messages(channel)
1548                    == [
1549                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1550                        ("user_a".to_string(), "oh, hi B.".to_string(), false),
1551                        ("user_a".to_string(), "sup".to_string(), false),
1552                    ]
1553            })
1554            .await;
1555
1556        assert_eq!(
1557            server
1558                .state()
1559                .await
1560                .channel(channel_id)
1561                .unwrap()
1562                .connection_ids
1563                .len(),
1564            2
1565        );
1566        cx_b.update(|_| drop(channel_b));
1567        server
1568            .condition(|state| state.channel(channel_id).unwrap().connection_ids.len() == 1)
1569            .await;
1570
1571        cx_a.update(|_| drop(channel_a));
1572        server
1573            .condition(|state| state.channel(channel_id).is_none())
1574            .await;
1575    }
1576
1577    #[gpui::test]
1578    async fn test_chat_message_validation(mut cx_a: TestAppContext) {
1579        cx_a.foreground().forbid_parking();
1580
1581        let mut server = TestServer::start().await;
1582        let (client_a, user_store_a) = server.create_client(&mut cx_a, "user_a").await;
1583
1584        let db = &server.app_state.db;
1585        let org_id = db.create_org("Test Org", "test-org").await.unwrap();
1586        let channel_id = db.create_org_channel(org_id, "test-channel").await.unwrap();
1587        db.add_org_member(org_id, current_user_id(&user_store_a, &cx_a), false)
1588            .await
1589            .unwrap();
1590        db.add_channel_member(channel_id, current_user_id(&user_store_a, &cx_a), false)
1591            .await
1592            .unwrap();
1593
1594        let channels_a = cx_a.add_model(|cx| ChannelList::new(user_store_a, client_a, cx));
1595        channels_a
1596            .condition(&mut cx_a, |list, _| list.available_channels().is_some())
1597            .await;
1598        let channel_a = channels_a.update(&mut cx_a, |this, cx| {
1599            this.get_channel(channel_id.to_proto(), cx).unwrap()
1600        });
1601
1602        // Messages aren't allowed to be too long.
1603        channel_a
1604            .update(&mut cx_a, |channel, cx| {
1605                let long_body = "this is long.\n".repeat(1024);
1606                channel.send_message(long_body, cx).unwrap()
1607            })
1608            .await
1609            .unwrap_err();
1610
1611        // Messages aren't allowed to be blank.
1612        channel_a.update(&mut cx_a, |channel, cx| {
1613            channel.send_message(String::new(), cx).unwrap_err()
1614        });
1615
1616        // Leading and trailing whitespace are trimmed.
1617        channel_a
1618            .update(&mut cx_a, |channel, cx| {
1619                channel
1620                    .send_message("\n surrounded by whitespace  \n".to_string(), cx)
1621                    .unwrap()
1622            })
1623            .await
1624            .unwrap();
1625        assert_eq!(
1626            db.get_channel_messages(channel_id, 10, None)
1627                .await
1628                .unwrap()
1629                .iter()
1630                .map(|m| &m.body)
1631                .collect::<Vec<_>>(),
1632            &["surrounded by whitespace"]
1633        );
1634    }
1635
1636    #[gpui::test]
1637    async fn test_chat_reconnection(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
1638        cx_a.foreground().forbid_parking();
1639
1640        // Connect to a server as 2 clients.
1641        let mut server = TestServer::start().await;
1642        let (client_a, user_store_a) = server.create_client(&mut cx_a, "user_a").await;
1643        let (client_b, user_store_b) = server.create_client(&mut cx_b, "user_b").await;
1644        let mut status_b = client_b.status();
1645
1646        // Create an org that includes these 2 users.
1647        let db = &server.app_state.db;
1648        let org_id = db.create_org("Test Org", "test-org").await.unwrap();
1649        db.add_org_member(org_id, current_user_id(&user_store_a, &cx_a), false)
1650            .await
1651            .unwrap();
1652        db.add_org_member(org_id, current_user_id(&user_store_b, &cx_b), false)
1653            .await
1654            .unwrap();
1655
1656        // Create a channel that includes all the users.
1657        let channel_id = db.create_org_channel(org_id, "test-channel").await.unwrap();
1658        db.add_channel_member(channel_id, current_user_id(&user_store_a, &cx_a), false)
1659            .await
1660            .unwrap();
1661        db.add_channel_member(channel_id, current_user_id(&user_store_b, &cx_b), false)
1662            .await
1663            .unwrap();
1664        db.create_channel_message(
1665            channel_id,
1666            current_user_id(&user_store_b, &cx_b),
1667            "hello A, it's B.",
1668            OffsetDateTime::now_utc(),
1669            2,
1670        )
1671        .await
1672        .unwrap();
1673
1674        let channels_a = cx_a.add_model(|cx| ChannelList::new(user_store_a, client_a, cx));
1675        channels_a
1676            .condition(&mut cx_a, |list, _| list.available_channels().is_some())
1677            .await;
1678
1679        channels_a.read_with(&cx_a, |list, _| {
1680            assert_eq!(
1681                list.available_channels().unwrap(),
1682                &[ChannelDetails {
1683                    id: channel_id.to_proto(),
1684                    name: "test-channel".to_string()
1685                }]
1686            )
1687        });
1688        let channel_a = channels_a.update(&mut cx_a, |this, cx| {
1689            this.get_channel(channel_id.to_proto(), cx).unwrap()
1690        });
1691        channel_a.read_with(&cx_a, |channel, _| assert!(channel.messages().is_empty()));
1692        channel_a
1693            .condition(&cx_a, |channel, _| {
1694                channel_messages(channel)
1695                    == [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1696            })
1697            .await;
1698
1699        let channels_b = cx_b.add_model(|cx| ChannelList::new(user_store_b.clone(), client_b, cx));
1700        channels_b
1701            .condition(&mut cx_b, |list, _| list.available_channels().is_some())
1702            .await;
1703        channels_b.read_with(&cx_b, |list, _| {
1704            assert_eq!(
1705                list.available_channels().unwrap(),
1706                &[ChannelDetails {
1707                    id: channel_id.to_proto(),
1708                    name: "test-channel".to_string()
1709                }]
1710            )
1711        });
1712
1713        let channel_b = channels_b.update(&mut cx_b, |this, cx| {
1714            this.get_channel(channel_id.to_proto(), cx).unwrap()
1715        });
1716        channel_b.read_with(&cx_b, |channel, _| assert!(channel.messages().is_empty()));
1717        channel_b
1718            .condition(&cx_b, |channel, _| {
1719                channel_messages(channel)
1720                    == [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1721            })
1722            .await;
1723
1724        // Disconnect client B, ensuring we can still access its cached channel data.
1725        server.forbid_connections();
1726        server.disconnect_client(current_user_id(&user_store_b, &cx_b));
1727        while !matches!(
1728            status_b.recv().await,
1729            Some(rpc::Status::ReconnectionError { .. })
1730        ) {}
1731
1732        channels_b.read_with(&cx_b, |channels, _| {
1733            assert_eq!(
1734                channels.available_channels().unwrap(),
1735                [ChannelDetails {
1736                    id: channel_id.to_proto(),
1737                    name: "test-channel".to_string()
1738                }]
1739            )
1740        });
1741        channel_b.read_with(&cx_b, |channel, _| {
1742            assert_eq!(
1743                channel_messages(channel),
1744                [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1745            )
1746        });
1747
1748        // Send a message from client B while it is disconnected.
1749        channel_b
1750            .update(&mut cx_b, |channel, cx| {
1751                let task = channel
1752                    .send_message("can you see this?".to_string(), cx)
1753                    .unwrap();
1754                assert_eq!(
1755                    channel_messages(channel),
1756                    &[
1757                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1758                        ("user_b".to_string(), "can you see this?".to_string(), true)
1759                    ]
1760                );
1761                task
1762            })
1763            .await
1764            .unwrap_err();
1765
1766        // Send a message from client A while B is disconnected.
1767        channel_a
1768            .update(&mut cx_a, |channel, cx| {
1769                channel
1770                    .send_message("oh, hi B.".to_string(), cx)
1771                    .unwrap()
1772                    .detach();
1773                let task = channel.send_message("sup".to_string(), cx).unwrap();
1774                assert_eq!(
1775                    channel_messages(channel),
1776                    &[
1777                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1778                        ("user_a".to_string(), "oh, hi B.".to_string(), true),
1779                        ("user_a".to_string(), "sup".to_string(), true)
1780                    ]
1781                );
1782                task
1783            })
1784            .await
1785            .unwrap();
1786
1787        // Give client B a chance to reconnect.
1788        server.allow_connections();
1789        cx_b.foreground().advance_clock(Duration::from_secs(10));
1790
1791        // Verify that B sees the new messages upon reconnection, as well as the message client B
1792        // sent while offline.
1793        channel_b
1794            .condition(&cx_b, |channel, _| {
1795                channel_messages(channel)
1796                    == [
1797                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1798                        ("user_a".to_string(), "oh, hi B.".to_string(), false),
1799                        ("user_a".to_string(), "sup".to_string(), false),
1800                        ("user_b".to_string(), "can you see this?".to_string(), false),
1801                    ]
1802            })
1803            .await;
1804
1805        // Ensure client A and B can communicate normally after reconnection.
1806        channel_a
1807            .update(&mut cx_a, |channel, cx| {
1808                channel.send_message("you online?".to_string(), cx).unwrap()
1809            })
1810            .await
1811            .unwrap();
1812        channel_b
1813            .condition(&cx_b, |channel, _| {
1814                channel_messages(channel)
1815                    == [
1816                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1817                        ("user_a".to_string(), "oh, hi B.".to_string(), false),
1818                        ("user_a".to_string(), "sup".to_string(), false),
1819                        ("user_b".to_string(), "can you see this?".to_string(), false),
1820                        ("user_a".to_string(), "you online?".to_string(), false),
1821                    ]
1822            })
1823            .await;
1824
1825        channel_b
1826            .update(&mut cx_b, |channel, cx| {
1827                channel.send_message("yep".to_string(), cx).unwrap()
1828            })
1829            .await
1830            .unwrap();
1831        channel_a
1832            .condition(&cx_a, |channel, _| {
1833                channel_messages(channel)
1834                    == [
1835                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1836                        ("user_a".to_string(), "oh, hi B.".to_string(), false),
1837                        ("user_a".to_string(), "sup".to_string(), false),
1838                        ("user_b".to_string(), "can you see this?".to_string(), false),
1839                        ("user_a".to_string(), "you online?".to_string(), false),
1840                        ("user_b".to_string(), "yep".to_string(), false),
1841                    ]
1842            })
1843            .await;
1844    }
1845
1846    #[gpui::test]
1847    async fn test_collaborators(
1848        mut cx_a: TestAppContext,
1849        mut cx_b: TestAppContext,
1850        mut cx_c: TestAppContext,
1851    ) {
1852        cx_a.foreground().forbid_parking();
1853        let lang_registry = Arc::new(LanguageRegistry::new());
1854
1855        // Connect to a server as 3 clients.
1856        let mut server = TestServer::start().await;
1857        let (client_a, user_store_a) = server.create_client(&mut cx_a, "user_a").await;
1858        let (client_b, user_store_b) = server.create_client(&mut cx_b, "user_b").await;
1859        let (_client_c, user_store_c) = server.create_client(&mut cx_c, "user_c").await;
1860
1861        let fs = Arc::new(FakeFs::new());
1862
1863        // Share a worktree as client A.
1864        fs.insert_tree(
1865            "/a",
1866            json!({
1867                ".zed.toml": r#"collaborators = ["user_b", "user_c"]"#,
1868            }),
1869        )
1870        .await;
1871
1872        let worktree_a = Worktree::open_local(
1873            client_a.clone(),
1874            "/a".as_ref(),
1875            fs.clone(),
1876            lang_registry.clone(),
1877            &mut cx_a.to_async(),
1878        )
1879        .await
1880        .unwrap();
1881
1882        user_store_a
1883            .condition(&cx_a, |user_store, _| {
1884                collaborators(user_store) == vec![("user_a", vec![("a", vec![])])]
1885            })
1886            .await;
1887        user_store_b
1888            .condition(&cx_b, |user_store, _| {
1889                collaborators(user_store) == vec![("user_a", vec![("a", vec![])])]
1890            })
1891            .await;
1892        user_store_c
1893            .condition(&cx_c, |user_store, _| {
1894                collaborators(user_store) == vec![("user_a", vec![("a", vec![])])]
1895            })
1896            .await;
1897
1898        let worktree_id = worktree_a
1899            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1900            .await
1901            .unwrap();
1902
1903        let _worktree_b = Worktree::open_remote(
1904            client_b.clone(),
1905            worktree_id,
1906            lang_registry.clone(),
1907            &mut cx_b.to_async(),
1908        )
1909        .await
1910        .unwrap();
1911
1912        user_store_a
1913            .condition(&cx_a, |user_store, _| {
1914                collaborators(user_store) == vec![("user_a", vec![("a", vec!["user_b"])])]
1915            })
1916            .await;
1917        user_store_b
1918            .condition(&cx_b, |user_store, _| {
1919                collaborators(user_store) == vec![("user_a", vec![("a", vec!["user_b"])])]
1920            })
1921            .await;
1922        user_store_c
1923            .condition(&cx_c, |user_store, _| {
1924                collaborators(user_store) == vec![("user_a", vec![("a", vec!["user_b"])])]
1925            })
1926            .await;
1927
1928        cx_a.update(move |_| drop(worktree_a));
1929        user_store_a
1930            .condition(&cx_a, |user_store, _| collaborators(user_store) == vec![])
1931            .await;
1932        user_store_b
1933            .condition(&cx_b, |user_store, _| collaborators(user_store) == vec![])
1934            .await;
1935        user_store_c
1936            .condition(&cx_c, |user_store, _| collaborators(user_store) == vec![])
1937            .await;
1938
1939        fn collaborators(user_store: &UserStore) -> Vec<(&str, Vec<(&str, Vec<&str>)>)> {
1940            user_store
1941                .collaborators()
1942                .iter()
1943                .map(|collaborator| {
1944                    let worktrees = collaborator
1945                        .worktrees
1946                        .iter()
1947                        .map(|w| {
1948                            (
1949                                w.root_name.as_str(),
1950                                w.guests.iter().map(|p| p.github_login.as_str()).collect(),
1951                            )
1952                        })
1953                        .collect();
1954                    (collaborator.user.github_login.as_str(), worktrees)
1955                })
1956                .collect()
1957        }
1958    }
1959
1960    struct TestServer {
1961        peer: Arc<Peer>,
1962        app_state: Arc<AppState>,
1963        server: Arc<Server>,
1964        notifications: mpsc::Receiver<()>,
1965        connection_killers: Arc<Mutex<HashMap<UserId, watch::Sender<Option<()>>>>>,
1966        forbid_connections: Arc<AtomicBool>,
1967        _test_db: TestDb,
1968    }
1969
1970    impl TestServer {
1971        async fn start() -> Self {
1972            let test_db = TestDb::new();
1973            let app_state = Self::build_app_state(&test_db).await;
1974            let peer = Peer::new();
1975            let notifications = mpsc::channel(128);
1976            let server = Server::new(app_state.clone(), peer.clone(), Some(notifications.0));
1977            Self {
1978                peer,
1979                app_state,
1980                server,
1981                notifications: notifications.1,
1982                connection_killers: Default::default(),
1983                forbid_connections: Default::default(),
1984                _test_db: test_db,
1985            }
1986        }
1987
1988        async fn create_client(
1989            &mut self,
1990            cx: &mut TestAppContext,
1991            name: &str,
1992        ) -> (Arc<Client>, ModelHandle<UserStore>) {
1993            let user_id = self.app_state.db.create_user(name, false).await.unwrap();
1994            let client_name = name.to_string();
1995            let mut client = Client::new();
1996            let server = self.server.clone();
1997            let connection_killers = self.connection_killers.clone();
1998            let forbid_connections = self.forbid_connections.clone();
1999            Arc::get_mut(&mut client)
2000                .unwrap()
2001                .override_authenticate(move |cx| {
2002                    cx.spawn(|_| async move {
2003                        let access_token = "the-token".to_string();
2004                        Ok(Credentials {
2005                            user_id: user_id.0 as u64,
2006                            access_token,
2007                        })
2008                    })
2009                })
2010                .override_establish_connection(move |credentials, cx| {
2011                    assert_eq!(credentials.user_id, user_id.0 as u64);
2012                    assert_eq!(credentials.access_token, "the-token");
2013
2014                    let server = server.clone();
2015                    let connection_killers = connection_killers.clone();
2016                    let forbid_connections = forbid_connections.clone();
2017                    let client_name = client_name.clone();
2018                    cx.spawn(move |cx| async move {
2019                        if forbid_connections.load(SeqCst) {
2020                            Err(EstablishConnectionError::other(anyhow!(
2021                                "server is forbidding connections"
2022                            )))
2023                        } else {
2024                            let (client_conn, server_conn, kill_conn) = Connection::in_memory();
2025                            connection_killers.lock().insert(user_id, kill_conn);
2026                            cx.background()
2027                                .spawn(server.handle_connection(server_conn, client_name, user_id))
2028                                .detach();
2029                            Ok(client_conn)
2030                        }
2031                    })
2032                });
2033
2034            let http = FakeHttpClient::new(|_| async move { Ok(surf::http::Response::new(404)) });
2035            client
2036                .authenticate_and_connect(&cx.to_async())
2037                .await
2038                .unwrap();
2039
2040            let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http, cx));
2041            let mut authed_user =
2042                user_store.read_with(cx, |user_store, _| user_store.watch_current_user());
2043            while authed_user.recv().await.unwrap().is_none() {}
2044
2045            (client, user_store)
2046        }
2047
2048        fn disconnect_client(&self, user_id: UserId) {
2049            if let Some(mut kill_conn) = self.connection_killers.lock().remove(&user_id) {
2050                let _ = kill_conn.try_send(Some(()));
2051            }
2052        }
2053
2054        fn forbid_connections(&self) {
2055            self.forbid_connections.store(true, SeqCst);
2056        }
2057
2058        fn allow_connections(&self) {
2059            self.forbid_connections.store(false, SeqCst);
2060        }
2061
2062        async fn build_app_state(test_db: &TestDb) -> Arc<AppState> {
2063            let mut config = Config::default();
2064            config.session_secret = "a".repeat(32);
2065            config.database_url = test_db.url.clone();
2066            let github_client = github::AppClient::test();
2067            Arc::new(AppState {
2068                db: test_db.db().clone(),
2069                handlebars: Default::default(),
2070                auth_client: auth::build_client("", ""),
2071                repo_client: github::RepoClient::test(&github_client),
2072                github_client,
2073                config,
2074            })
2075        }
2076
2077        async fn state<'a>(&'a self) -> RwLockReadGuard<'a, Store> {
2078            self.server.store.read().await
2079        }
2080
2081        async fn condition<F>(&mut self, mut predicate: F)
2082        where
2083            F: FnMut(&Store) -> bool,
2084        {
2085            async_std::future::timeout(Duration::from_millis(500), async {
2086                while !(predicate)(&*self.server.store.read().await) {
2087                    self.notifications.recv().await;
2088                }
2089            })
2090            .await
2091            .expect("condition timed out");
2092        }
2093    }
2094
2095    impl Drop for TestServer {
2096        fn drop(&mut self) {
2097            task::block_on(self.peer.reset());
2098        }
2099    }
2100
2101    fn current_user_id(user_store: &ModelHandle<UserStore>, cx: &TestAppContext) -> UserId {
2102        UserId::from_proto(
2103            user_store.read_with(cx, |user_store, _| user_store.current_user().unwrap().id),
2104        )
2105    }
2106
2107    fn channel_messages(channel: &Channel) -> Vec<(String, String, bool)> {
2108        channel
2109            .messages()
2110            .cursor::<(), ()>()
2111            .map(|m| {
2112                (
2113                    m.sender.github_login.clone(),
2114                    m.body.clone(),
2115                    m.is_pending(),
2116                )
2117            })
2118            .collect()
2119    }
2120
2121    struct EmptyView;
2122
2123    impl gpui::Entity for EmptyView {
2124        type Event = ();
2125    }
2126
2127    impl gpui::View for EmptyView {
2128        fn ui_name() -> &'static str {
2129            "empty view"
2130        }
2131
2132        fn render(&mut self, _: &mut gpui::RenderContext<Self>) -> gpui::ElementBox {
2133            gpui::Element::boxed(gpui::elements::Empty)
2134        }
2135    }
2136}