rpc.rs

   1mod store;
   2
   3use super::{
   4    auth::process_auth_header,
   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 rpc::{
  14    proto::{self, AnyTypedEnvelope, EnvelopedMessage},
  15    Connection, ConnectionId, Peer, TypedEnvelope,
  16};
  17use sha1::{Digest as _, Sha1};
  18use std::{
  19    any::TypeId,
  20    collections::{HashMap, HashSet},
  21    future::Future,
  22    mem,
  23    sync::Arc,
  24    time::Instant,
  25};
  26use store::{JoinedWorktree, Store, Worktree};
  27use surf::StatusCode;
  28use tide::log;
  29use tide::{
  30    http::headers::{HeaderName, CONNECTION, UPGRADE},
  31    Request, Response,
  32};
  33use time::OffsetDateTime;
  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").get(move |request: Request<Arc<AppState>>| {
 889        let server = server.clone();
 890        async move {
 891            const WEBSOCKET_GUID: &str = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 892
 893            let connection_upgrade = header_contains_ignore_case(&request, CONNECTION, "upgrade");
 894            let upgrade_to_websocket = header_contains_ignore_case(&request, UPGRADE, "websocket");
 895            let upgrade_requested = connection_upgrade && upgrade_to_websocket;
 896            let client_protocol_version: Option<u32> = request
 897                .header("X-Zed-Protocol-Version")
 898                .and_then(|v| v.as_str().parse().ok());
 899
 900            if !upgrade_requested || client_protocol_version != Some(rpc::PROTOCOL_VERSION) {
 901                return Ok(Response::new(StatusCode::UpgradeRequired));
 902            }
 903
 904            let header = match request.header("Sec-Websocket-Key") {
 905                Some(h) => h.as_str(),
 906                None => return Err(anyhow!("expected sec-websocket-key"))?,
 907            };
 908
 909            let user_id = process_auth_header(&request).await?;
 910
 911            let mut response = Response::new(StatusCode::SwitchingProtocols);
 912            response.insert_header(UPGRADE, "websocket");
 913            response.insert_header(CONNECTION, "Upgrade");
 914            let hash = Sha1::new().chain(header).chain(WEBSOCKET_GUID).finalize();
 915            response.insert_header("Sec-Websocket-Accept", base64::encode(&hash[..]));
 916            response.insert_header("Sec-Websocket-Version", "13");
 917
 918            let http_res: &mut tide::http::Response = response.as_mut();
 919            let upgrade_receiver = http_res.recv_upgrade().await;
 920            let addr = request.remote().unwrap_or("unknown").to_string();
 921            task::spawn(async move {
 922                if let Some(stream) = upgrade_receiver.await {
 923                    server
 924                        .handle_connection(
 925                            Connection::new(
 926                                WebSocketStream::from_raw_socket(stream, Role::Server, None).await,
 927                            ),
 928                            addr,
 929                            user_id,
 930                        )
 931                        .await;
 932                }
 933            });
 934
 935            Ok(response)
 936        }
 937    });
 938}
 939
 940fn header_contains_ignore_case<T>(
 941    request: &tide::Request<T>,
 942    header_name: HeaderName,
 943    value: &str,
 944) -> bool {
 945    request
 946        .header(header_name)
 947        .map(|h| {
 948            h.as_str()
 949                .split(',')
 950                .any(|s| s.trim().eq_ignore_ascii_case(value.trim()))
 951        })
 952        .unwrap_or(false)
 953}
 954
 955#[cfg(test)]
 956mod tests {
 957    use super::*;
 958    use crate::{
 959        auth,
 960        db::{tests::TestDb, UserId},
 961        github, AppState, Config,
 962    };
 963    use ::rpc::Peer;
 964    use async_std::{sync::RwLockReadGuard, task};
 965    use gpui::{ModelHandle, TestAppContext};
 966    use parking_lot::Mutex;
 967    use postage::{mpsc, watch};
 968    use serde_json::json;
 969    use sqlx::types::time::OffsetDateTime;
 970    use std::{
 971        path::Path,
 972        sync::{
 973            atomic::{AtomicBool, Ordering::SeqCst},
 974            Arc,
 975        },
 976        time::Duration,
 977    };
 978    use zed::{
 979        buffer::LanguageRegistry,
 980        client::{
 981            self, test::FakeHttpClient, Channel, ChannelDetails, ChannelList, Client, Credentials,
 982            EstablishConnectionError, UserStore,
 983        },
 984        editor::{Editor, EditorSettings, Input},
 985        fs::{FakeFs, Fs as _},
 986        people_panel::JoinWorktree,
 987        project::{ProjectPath, Worktree},
 988        workspace::{Workspace, WorkspaceParams},
 989    };
 990
 991    #[gpui::test]
 992    async fn test_share_worktree(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
 993        let (window_b, _) = cx_b.add_window(|_| EmptyView);
 994        let lang_registry = Arc::new(LanguageRegistry::new());
 995
 996        // Connect to a server as 2 clients.
 997        let mut server = TestServer::start().await;
 998        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
 999        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
1000
1001        cx_a.foreground().forbid_parking();
1002
1003        // Share a local worktree as client A
1004        let fs = Arc::new(FakeFs::new());
1005        fs.insert_tree(
1006            "/a",
1007            json!({
1008                ".zed.toml": r#"collaborators = ["user_b"]"#,
1009                "a.txt": "a-contents",
1010                "b.txt": "b-contents",
1011            }),
1012        )
1013        .await;
1014        let worktree_a = Worktree::open_local(
1015            client_a.clone(),
1016            "/a".as_ref(),
1017            fs,
1018            lang_registry.clone(),
1019            &mut cx_a.to_async(),
1020        )
1021        .await
1022        .unwrap();
1023        worktree_a
1024            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1025            .await;
1026        let worktree_id = worktree_a
1027            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1028            .await
1029            .unwrap();
1030
1031        // Join that worktree as client B, and see that a guest has joined as client A.
1032        let worktree_b = Worktree::open_remote(
1033            client_b.clone(),
1034            worktree_id,
1035            lang_registry.clone(),
1036            &mut cx_b.to_async(),
1037        )
1038        .await
1039        .unwrap();
1040        let replica_id_b = worktree_b.read_with(&cx_b, |tree, _| tree.replica_id());
1041        worktree_a
1042            .condition(&cx_a, |tree, _| {
1043                tree.peers()
1044                    .values()
1045                    .any(|replica_id| *replica_id == replica_id_b)
1046            })
1047            .await;
1048
1049        // Open the same file as client B and client A.
1050        let buffer_b = worktree_b
1051            .update(&mut cx_b, |worktree, cx| worktree.open_buffer("b.txt", cx))
1052            .await
1053            .unwrap();
1054        buffer_b.read_with(&cx_b, |buf, _| assert_eq!(buf.text(), "b-contents"));
1055        worktree_a.read_with(&cx_a, |tree, cx| assert!(tree.has_open_buffer("b.txt", cx)));
1056        let buffer_a = worktree_a
1057            .update(&mut cx_a, |tree, cx| tree.open_buffer("b.txt", cx))
1058            .await
1059            .unwrap();
1060
1061        // Create a selection set as client B and see that selection set as client A.
1062        let editor_b = cx_b.add_view(window_b, |cx| {
1063            Editor::for_buffer(buffer_b, |cx| EditorSettings::test(cx), cx)
1064        });
1065        buffer_a
1066            .condition(&cx_a, |buffer, _| buffer.selection_sets().count() == 1)
1067            .await;
1068
1069        // Edit the buffer as client B and see that edit as client A.
1070        editor_b.update(&mut cx_b, |editor, cx| {
1071            editor.handle_input(&Input("ok, ".into()), cx)
1072        });
1073        buffer_a
1074            .condition(&cx_a, |buffer, _| buffer.text() == "ok, b-contents")
1075            .await;
1076
1077        // Remove the selection set as client B, see those selections disappear as client A.
1078        cx_b.update(move |_| drop(editor_b));
1079        buffer_a
1080            .condition(&cx_a, |buffer, _| buffer.selection_sets().count() == 0)
1081            .await;
1082
1083        // Close the buffer as client A, see that the buffer is closed.
1084        cx_a.update(move |_| drop(buffer_a));
1085        worktree_a
1086            .condition(&cx_a, |tree, cx| !tree.has_open_buffer("b.txt", cx))
1087            .await;
1088
1089        // Dropping the worktree removes client B from client A's peers.
1090        cx_b.update(move |_| drop(worktree_b));
1091        worktree_a
1092            .condition(&cx_a, |tree, _| tree.peers().is_empty())
1093            .await;
1094    }
1095
1096    #[gpui::test]
1097    async fn test_unshare_worktree(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
1098        cx_b.update(zed::people_panel::init);
1099        let lang_registry = Arc::new(LanguageRegistry::new());
1100
1101        // Connect to a server as 2 clients.
1102        let mut server = TestServer::start().await;
1103        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1104        let (client_b, user_store_b) = server.create_client(&mut cx_b, "user_b").await;
1105        let mut workspace_b_params = cx_b.update(WorkspaceParams::test);
1106        workspace_b_params.client = client_b;
1107        workspace_b_params.user_store = user_store_b;
1108
1109        cx_a.foreground().forbid_parking();
1110
1111        // Share a local worktree as client A
1112        let fs = Arc::new(FakeFs::new());
1113        fs.insert_tree(
1114            "/a",
1115            json!({
1116                ".zed.toml": r#"collaborators = ["user_b"]"#,
1117                "a.txt": "a-contents",
1118                "b.txt": "b-contents",
1119            }),
1120        )
1121        .await;
1122        let worktree_a = Worktree::open_local(
1123            client_a.clone(),
1124            "/a".as_ref(),
1125            fs,
1126            lang_registry.clone(),
1127            &mut cx_a.to_async(),
1128        )
1129        .await
1130        .unwrap();
1131        worktree_a
1132            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1133            .await;
1134
1135        let remote_worktree_id = worktree_a
1136            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1137            .await
1138            .unwrap();
1139
1140        let (window_b, workspace_b) = cx_b.add_window(|cx| Workspace::new(&workspace_b_params, cx));
1141        cx_b.update(|cx| {
1142            cx.dispatch_action(
1143                window_b,
1144                vec![workspace_b.id()],
1145                &JoinWorktree(remote_worktree_id),
1146            );
1147        });
1148        workspace_b
1149            .condition(&cx_b, |workspace, cx| workspace.worktrees(cx).len() == 1)
1150            .await;
1151
1152        let local_worktree_id_b = workspace_b.read_with(&cx_b, |workspace, cx| {
1153            let active_pane = workspace.active_pane().read(cx);
1154            assert!(active_pane.active_item().is_none());
1155            workspace.worktrees(cx).first().unwrap().id()
1156        });
1157        workspace_b
1158            .update(&mut cx_b, |workspace, cx| {
1159                workspace.open_entry(
1160                    ProjectPath {
1161                        worktree_id: local_worktree_id_b,
1162                        path: Path::new("a.txt").into(),
1163                    },
1164                    cx,
1165                )
1166            })
1167            .unwrap()
1168            .await;
1169        workspace_b.read_with(&cx_b, |workspace, cx| {
1170            let active_pane = workspace.active_pane().read(cx);
1171            assert!(active_pane.active_item().is_some());
1172        });
1173
1174        worktree_a.update(&mut cx_a, |tree, cx| {
1175            tree.as_local_mut().unwrap().unshare(cx);
1176        });
1177        workspace_b
1178            .condition(&cx_b, |workspace, cx| workspace.worktrees(cx).len() == 0)
1179            .await;
1180        workspace_b.read_with(&cx_b, |workspace, cx| {
1181            let active_pane = workspace.active_pane().read(cx);
1182            assert!(active_pane.active_item().is_none());
1183        });
1184    }
1185
1186    #[gpui::test]
1187    async fn test_propagate_saves_and_fs_changes_in_shared_worktree(
1188        mut cx_a: TestAppContext,
1189        mut cx_b: TestAppContext,
1190        mut cx_c: TestAppContext,
1191    ) {
1192        cx_a.foreground().forbid_parking();
1193        let lang_registry = Arc::new(LanguageRegistry::new());
1194
1195        // Connect to a server as 3 clients.
1196        let mut server = TestServer::start().await;
1197        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1198        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
1199        let (client_c, _) = server.create_client(&mut cx_c, "user_c").await;
1200
1201        let fs = Arc::new(FakeFs::new());
1202
1203        // Share a worktree as client A.
1204        fs.insert_tree(
1205            "/a",
1206            json!({
1207                ".zed.toml": r#"collaborators = ["user_b", "user_c"]"#,
1208                "file1": "",
1209                "file2": ""
1210            }),
1211        )
1212        .await;
1213
1214        let worktree_a = Worktree::open_local(
1215            client_a.clone(),
1216            "/a".as_ref(),
1217            fs.clone(),
1218            lang_registry.clone(),
1219            &mut cx_a.to_async(),
1220        )
1221        .await
1222        .unwrap();
1223        worktree_a
1224            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1225            .await;
1226        let worktree_id = worktree_a
1227            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1228            .await
1229            .unwrap();
1230
1231        // Join that worktree as clients B and C.
1232        let worktree_b = Worktree::open_remote(
1233            client_b.clone(),
1234            worktree_id,
1235            lang_registry.clone(),
1236            &mut cx_b.to_async(),
1237        )
1238        .await
1239        .unwrap();
1240        let worktree_c = Worktree::open_remote(
1241            client_c.clone(),
1242            worktree_id,
1243            lang_registry.clone(),
1244            &mut cx_c.to_async(),
1245        )
1246        .await
1247        .unwrap();
1248
1249        // Open and edit a buffer as both guests B and C.
1250        let buffer_b = worktree_b
1251            .update(&mut cx_b, |tree, cx| tree.open_buffer("file1", cx))
1252            .await
1253            .unwrap();
1254        let buffer_c = worktree_c
1255            .update(&mut cx_c, |tree, cx| tree.open_buffer("file1", cx))
1256            .await
1257            .unwrap();
1258        buffer_b.update(&mut cx_b, |buf, cx| buf.edit([0..0], "i-am-b, ", cx));
1259        buffer_c.update(&mut cx_c, |buf, cx| buf.edit([0..0], "i-am-c, ", cx));
1260
1261        // Open and edit that buffer as the host.
1262        let buffer_a = worktree_a
1263            .update(&mut cx_a, |tree, cx| tree.open_buffer("file1", cx))
1264            .await
1265            .unwrap();
1266
1267        buffer_a
1268            .condition(&mut cx_a, |buf, _| buf.text() == "i-am-c, i-am-b, ")
1269            .await;
1270        buffer_a.update(&mut cx_a, |buf, cx| {
1271            buf.edit([buf.len()..buf.len()], "i-am-a", cx)
1272        });
1273
1274        // Wait for edits to propagate
1275        buffer_a
1276            .condition(&mut cx_a, |buf, _| buf.text() == "i-am-c, i-am-b, i-am-a")
1277            .await;
1278        buffer_b
1279            .condition(&mut cx_b, |buf, _| buf.text() == "i-am-c, i-am-b, i-am-a")
1280            .await;
1281        buffer_c
1282            .condition(&mut cx_c, |buf, _| buf.text() == "i-am-c, i-am-b, i-am-a")
1283            .await;
1284
1285        // Edit the buffer as the host and concurrently save as guest B.
1286        let save_b = buffer_b.update(&mut cx_b, |buf, cx| buf.save(cx).unwrap());
1287        buffer_a.update(&mut cx_a, |buf, cx| buf.edit([0..0], "hi-a, ", cx));
1288        save_b.await.unwrap();
1289        assert_eq!(
1290            fs.load("/a/file1".as_ref()).await.unwrap(),
1291            "hi-a, i-am-c, i-am-b, i-am-a"
1292        );
1293        buffer_a.read_with(&cx_a, |buf, _| assert!(!buf.is_dirty()));
1294        buffer_b.read_with(&cx_b, |buf, _| assert!(!buf.is_dirty()));
1295        buffer_c.condition(&cx_c, |buf, _| !buf.is_dirty()).await;
1296
1297        // Make changes on host's file system, see those changes on the guests.
1298        fs.rename("/a/file2".as_ref(), "/a/file3".as_ref())
1299            .await
1300            .unwrap();
1301        fs.insert_file(Path::new("/a/file4"), "4".into())
1302            .await
1303            .unwrap();
1304
1305        worktree_b
1306            .condition(&cx_b, |tree, _| tree.file_count() == 4)
1307            .await;
1308        worktree_c
1309            .condition(&cx_c, |tree, _| tree.file_count() == 4)
1310            .await;
1311        worktree_b.read_with(&cx_b, |tree, _| {
1312            assert_eq!(
1313                tree.paths()
1314                    .map(|p| p.to_string_lossy())
1315                    .collect::<Vec<_>>(),
1316                &[".zed.toml", "file1", "file3", "file4"]
1317            )
1318        });
1319        worktree_c.read_with(&cx_c, |tree, _| {
1320            assert_eq!(
1321                tree.paths()
1322                    .map(|p| p.to_string_lossy())
1323                    .collect::<Vec<_>>(),
1324                &[".zed.toml", "file1", "file3", "file4"]
1325            )
1326        });
1327    }
1328
1329    #[gpui::test]
1330    async fn test_buffer_conflict_after_save(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
1331        cx_a.foreground().forbid_parking();
1332        let lang_registry = Arc::new(LanguageRegistry::new());
1333
1334        // Connect to a server as 2 clients.
1335        let mut server = TestServer::start().await;
1336        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1337        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
1338
1339        // Share a local worktree as client A
1340        let fs = Arc::new(FakeFs::new());
1341        fs.insert_tree(
1342            "/dir",
1343            json!({
1344                ".zed.toml": r#"collaborators = ["user_b", "user_c"]"#,
1345                "a.txt": "a-contents",
1346            }),
1347        )
1348        .await;
1349
1350        let worktree_a = Worktree::open_local(
1351            client_a.clone(),
1352            "/dir".as_ref(),
1353            fs,
1354            lang_registry.clone(),
1355            &mut cx_a.to_async(),
1356        )
1357        .await
1358        .unwrap();
1359        worktree_a
1360            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1361            .await;
1362        let worktree_id = worktree_a
1363            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1364            .await
1365            .unwrap();
1366
1367        // Join that worktree as client B, and see that a guest has joined as client A.
1368        let worktree_b = Worktree::open_remote(
1369            client_b.clone(),
1370            worktree_id,
1371            lang_registry.clone(),
1372            &mut cx_b.to_async(),
1373        )
1374        .await
1375        .unwrap();
1376
1377        let buffer_b = worktree_b
1378            .update(&mut cx_b, |worktree, cx| worktree.open_buffer("a.txt", cx))
1379            .await
1380            .unwrap();
1381        let mtime = buffer_b.read_with(&cx_b, |buf, _| buf.file().unwrap().mtime());
1382
1383        buffer_b.update(&mut cx_b, |buf, cx| buf.edit([0..0], "world ", cx));
1384        buffer_b.read_with(&cx_b, |buf, _| {
1385            assert!(buf.is_dirty());
1386            assert!(!buf.has_conflict());
1387        });
1388
1389        buffer_b
1390            .update(&mut cx_b, |buf, cx| buf.save(cx))
1391            .unwrap()
1392            .await
1393            .unwrap();
1394        worktree_b
1395            .condition(&cx_b, |_, cx| {
1396                buffer_b.read(cx).file().unwrap().mtime() != mtime
1397            })
1398            .await;
1399        buffer_b.read_with(&cx_b, |buf, _| {
1400            assert!(!buf.is_dirty());
1401            assert!(!buf.has_conflict());
1402        });
1403
1404        buffer_b.update(&mut cx_b, |buf, cx| buf.edit([0..0], "hello ", cx));
1405        buffer_b.read_with(&cx_b, |buf, _| {
1406            assert!(buf.is_dirty());
1407            assert!(!buf.has_conflict());
1408        });
1409    }
1410
1411    #[gpui::test]
1412    async fn test_editing_while_guest_opens_buffer(
1413        mut cx_a: TestAppContext,
1414        mut cx_b: TestAppContext,
1415    ) {
1416        cx_a.foreground().forbid_parking();
1417        let lang_registry = Arc::new(LanguageRegistry::new());
1418
1419        // Connect to a server as 2 clients.
1420        let mut server = TestServer::start().await;
1421        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1422        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
1423
1424        // Share a local worktree as client A
1425        let fs = Arc::new(FakeFs::new());
1426        fs.insert_tree(
1427            "/dir",
1428            json!({
1429                ".zed.toml": r#"collaborators = ["user_b"]"#,
1430                "a.txt": "a-contents",
1431            }),
1432        )
1433        .await;
1434        let worktree_a = Worktree::open_local(
1435            client_a.clone(),
1436            "/dir".as_ref(),
1437            fs,
1438            lang_registry.clone(),
1439            &mut cx_a.to_async(),
1440        )
1441        .await
1442        .unwrap();
1443        worktree_a
1444            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1445            .await;
1446        let worktree_id = worktree_a
1447            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1448            .await
1449            .unwrap();
1450
1451        // Join that worktree as client B, and see that a guest has joined as client A.
1452        let worktree_b = Worktree::open_remote(
1453            client_b.clone(),
1454            worktree_id,
1455            lang_registry.clone(),
1456            &mut cx_b.to_async(),
1457        )
1458        .await
1459        .unwrap();
1460
1461        let buffer_a = worktree_a
1462            .update(&mut cx_a, |tree, cx| tree.open_buffer("a.txt", cx))
1463            .await
1464            .unwrap();
1465        let buffer_b = cx_b
1466            .background()
1467            .spawn(worktree_b.update(&mut cx_b, |worktree, cx| worktree.open_buffer("a.txt", cx)));
1468
1469        task::yield_now().await;
1470        buffer_a.update(&mut cx_a, |buf, cx| buf.edit([0..0], "z", cx));
1471
1472        let text = buffer_a.read_with(&cx_a, |buf, _| buf.text());
1473        let buffer_b = buffer_b.await.unwrap();
1474        buffer_b.condition(&cx_b, |buf, _| buf.text() == text).await;
1475    }
1476
1477    #[gpui::test]
1478    async fn test_leaving_worktree_while_opening_buffer(
1479        mut cx_a: TestAppContext,
1480        mut cx_b: TestAppContext,
1481    ) {
1482        cx_a.foreground().forbid_parking();
1483        let lang_registry = Arc::new(LanguageRegistry::new());
1484
1485        // Connect to a server as 2 clients.
1486        let mut server = TestServer::start().await;
1487        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1488        let (client_b, _) = server.create_client(&mut cx_b, "user_b").await;
1489
1490        // Share a local worktree as client A
1491        let fs = Arc::new(FakeFs::new());
1492        fs.insert_tree(
1493            "/dir",
1494            json!({
1495                ".zed.toml": r#"collaborators = ["user_b"]"#,
1496                "a.txt": "a-contents",
1497            }),
1498        )
1499        .await;
1500        let worktree_a = Worktree::open_local(
1501            client_a.clone(),
1502            "/dir".as_ref(),
1503            fs,
1504            lang_registry.clone(),
1505            &mut cx_a.to_async(),
1506        )
1507        .await
1508        .unwrap();
1509        worktree_a
1510            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1511            .await;
1512        let worktree_id = worktree_a
1513            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1514            .await
1515            .unwrap();
1516
1517        // Join that worktree as client B, and see that a guest has joined as client A.
1518        let worktree_b = Worktree::open_remote(
1519            client_b.clone(),
1520            worktree_id,
1521            lang_registry.clone(),
1522            &mut cx_b.to_async(),
1523        )
1524        .await
1525        .unwrap();
1526        worktree_a
1527            .condition(&cx_a, |tree, _| tree.peers().len() == 1)
1528            .await;
1529
1530        let buffer_b = cx_b
1531            .background()
1532            .spawn(worktree_b.update(&mut cx_b, |worktree, cx| worktree.open_buffer("a.txt", cx)));
1533        cx_b.update(|_| drop(worktree_b));
1534        drop(buffer_b);
1535        worktree_a
1536            .condition(&cx_a, |tree, _| tree.peers().len() == 0)
1537            .await;
1538    }
1539
1540    #[gpui::test]
1541    async fn test_peer_disconnection(mut cx_a: TestAppContext, cx_b: TestAppContext) {
1542        cx_a.foreground().forbid_parking();
1543        let lang_registry = Arc::new(LanguageRegistry::new());
1544
1545        // Connect to a server as 2 clients.
1546        let mut server = TestServer::start().await;
1547        let (client_a, _) = server.create_client(&mut cx_a, "user_a").await;
1548        let (client_b, _) = server.create_client(&mut cx_a, "user_b").await;
1549
1550        // Share a local worktree as client A
1551        let fs = Arc::new(FakeFs::new());
1552        fs.insert_tree(
1553            "/a",
1554            json!({
1555                ".zed.toml": r#"collaborators = ["user_b"]"#,
1556                "a.txt": "a-contents",
1557                "b.txt": "b-contents",
1558            }),
1559        )
1560        .await;
1561        let worktree_a = Worktree::open_local(
1562            client_a.clone(),
1563            "/a".as_ref(),
1564            fs,
1565            lang_registry.clone(),
1566            &mut cx_a.to_async(),
1567        )
1568        .await
1569        .unwrap();
1570        worktree_a
1571            .read_with(&cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
1572            .await;
1573        let worktree_id = worktree_a
1574            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
1575            .await
1576            .unwrap();
1577
1578        // Join that worktree as client B, and see that a guest has joined as client A.
1579        let _worktree_b = Worktree::open_remote(
1580            client_b.clone(),
1581            worktree_id,
1582            lang_registry.clone(),
1583            &mut cx_b.to_async(),
1584        )
1585        .await
1586        .unwrap();
1587        worktree_a
1588            .condition(&cx_a, |tree, _| tree.peers().len() == 1)
1589            .await;
1590
1591        // Drop client B's connection and ensure client A observes client B leaving the worktree.
1592        client_b.disconnect(&cx_b.to_async()).await.unwrap();
1593        worktree_a
1594            .condition(&cx_a, |tree, _| tree.peers().len() == 0)
1595            .await;
1596    }
1597
1598    #[gpui::test]
1599    async fn test_basic_chat(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
1600        cx_a.foreground().forbid_parking();
1601
1602        // Connect to a server as 2 clients.
1603        let mut server = TestServer::start().await;
1604        let (client_a, user_store_a) = server.create_client(&mut cx_a, "user_a").await;
1605        let (client_b, user_store_b) = server.create_client(&mut cx_b, "user_b").await;
1606
1607        // Create an org that includes these 2 users.
1608        let db = &server.app_state.db;
1609        let org_id = db.create_org("Test Org", "test-org").await.unwrap();
1610        db.add_org_member(org_id, current_user_id(&user_store_a, &cx_a), false)
1611            .await
1612            .unwrap();
1613        db.add_org_member(org_id, current_user_id(&user_store_b, &cx_b), false)
1614            .await
1615            .unwrap();
1616
1617        // Create a channel that includes all the users.
1618        let channel_id = db.create_org_channel(org_id, "test-channel").await.unwrap();
1619        db.add_channel_member(channel_id, current_user_id(&user_store_a, &cx_a), false)
1620            .await
1621            .unwrap();
1622        db.add_channel_member(channel_id, current_user_id(&user_store_b, &cx_b), false)
1623            .await
1624            .unwrap();
1625        db.create_channel_message(
1626            channel_id,
1627            current_user_id(&user_store_b, &cx_b),
1628            "hello A, it's B.",
1629            OffsetDateTime::now_utc(),
1630            1,
1631        )
1632        .await
1633        .unwrap();
1634
1635        let channels_a = cx_a.add_model(|cx| ChannelList::new(user_store_a, client_a, cx));
1636        channels_a
1637            .condition(&mut cx_a, |list, _| list.available_channels().is_some())
1638            .await;
1639        channels_a.read_with(&cx_a, |list, _| {
1640            assert_eq!(
1641                list.available_channels().unwrap(),
1642                &[ChannelDetails {
1643                    id: channel_id.to_proto(),
1644                    name: "test-channel".to_string()
1645                }]
1646            )
1647        });
1648        let channel_a = channels_a.update(&mut cx_a, |this, cx| {
1649            this.get_channel(channel_id.to_proto(), cx).unwrap()
1650        });
1651        channel_a.read_with(&cx_a, |channel, _| assert!(channel.messages().is_empty()));
1652        channel_a
1653            .condition(&cx_a, |channel, _| {
1654                channel_messages(channel)
1655                    == [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1656            })
1657            .await;
1658
1659        let channels_b = cx_b.add_model(|cx| ChannelList::new(user_store_b, client_b, cx));
1660        channels_b
1661            .condition(&mut cx_b, |list, _| list.available_channels().is_some())
1662            .await;
1663        channels_b.read_with(&cx_b, |list, _| {
1664            assert_eq!(
1665                list.available_channels().unwrap(),
1666                &[ChannelDetails {
1667                    id: channel_id.to_proto(),
1668                    name: "test-channel".to_string()
1669                }]
1670            )
1671        });
1672
1673        let channel_b = channels_b.update(&mut cx_b, |this, cx| {
1674            this.get_channel(channel_id.to_proto(), cx).unwrap()
1675        });
1676        channel_b.read_with(&cx_b, |channel, _| assert!(channel.messages().is_empty()));
1677        channel_b
1678            .condition(&cx_b, |channel, _| {
1679                channel_messages(channel)
1680                    == [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1681            })
1682            .await;
1683
1684        channel_a
1685            .update(&mut cx_a, |channel, cx| {
1686                channel
1687                    .send_message("oh, hi B.".to_string(), cx)
1688                    .unwrap()
1689                    .detach();
1690                let task = channel.send_message("sup".to_string(), cx).unwrap();
1691                assert_eq!(
1692                    channel_messages(channel),
1693                    &[
1694                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1695                        ("user_a".to_string(), "oh, hi B.".to_string(), true),
1696                        ("user_a".to_string(), "sup".to_string(), true)
1697                    ]
1698                );
1699                task
1700            })
1701            .await
1702            .unwrap();
1703
1704        channel_b
1705            .condition(&cx_b, |channel, _| {
1706                channel_messages(channel)
1707                    == [
1708                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1709                        ("user_a".to_string(), "oh, hi B.".to_string(), false),
1710                        ("user_a".to_string(), "sup".to_string(), false),
1711                    ]
1712            })
1713            .await;
1714
1715        assert_eq!(
1716            server
1717                .state()
1718                .await
1719                .channel(channel_id)
1720                .unwrap()
1721                .connection_ids
1722                .len(),
1723            2
1724        );
1725        cx_b.update(|_| drop(channel_b));
1726        server
1727            .condition(|state| state.channel(channel_id).unwrap().connection_ids.len() == 1)
1728            .await;
1729
1730        cx_a.update(|_| drop(channel_a));
1731        server
1732            .condition(|state| state.channel(channel_id).is_none())
1733            .await;
1734    }
1735
1736    #[gpui::test]
1737    async fn test_chat_message_validation(mut cx_a: TestAppContext) {
1738        cx_a.foreground().forbid_parking();
1739
1740        let mut server = TestServer::start().await;
1741        let (client_a, user_store_a) = server.create_client(&mut cx_a, "user_a").await;
1742
1743        let db = &server.app_state.db;
1744        let org_id = db.create_org("Test Org", "test-org").await.unwrap();
1745        let channel_id = db.create_org_channel(org_id, "test-channel").await.unwrap();
1746        db.add_org_member(org_id, current_user_id(&user_store_a, &cx_a), false)
1747            .await
1748            .unwrap();
1749        db.add_channel_member(channel_id, current_user_id(&user_store_a, &cx_a), false)
1750            .await
1751            .unwrap();
1752
1753        let channels_a = cx_a.add_model(|cx| ChannelList::new(user_store_a, client_a, cx));
1754        channels_a
1755            .condition(&mut cx_a, |list, _| list.available_channels().is_some())
1756            .await;
1757        let channel_a = channels_a.update(&mut cx_a, |this, cx| {
1758            this.get_channel(channel_id.to_proto(), cx).unwrap()
1759        });
1760
1761        // Messages aren't allowed to be too long.
1762        channel_a
1763            .update(&mut cx_a, |channel, cx| {
1764                let long_body = "this is long.\n".repeat(1024);
1765                channel.send_message(long_body, cx).unwrap()
1766            })
1767            .await
1768            .unwrap_err();
1769
1770        // Messages aren't allowed to be blank.
1771        channel_a.update(&mut cx_a, |channel, cx| {
1772            channel.send_message(String::new(), cx).unwrap_err()
1773        });
1774
1775        // Leading and trailing whitespace are trimmed.
1776        channel_a
1777            .update(&mut cx_a, |channel, cx| {
1778                channel
1779                    .send_message("\n surrounded by whitespace  \n".to_string(), cx)
1780                    .unwrap()
1781            })
1782            .await
1783            .unwrap();
1784        assert_eq!(
1785            db.get_channel_messages(channel_id, 10, None)
1786                .await
1787                .unwrap()
1788                .iter()
1789                .map(|m| &m.body)
1790                .collect::<Vec<_>>(),
1791            &["surrounded by whitespace"]
1792        );
1793    }
1794
1795    #[gpui::test]
1796    async fn test_chat_reconnection(mut cx_a: TestAppContext, mut cx_b: TestAppContext) {
1797        cx_a.foreground().forbid_parking();
1798
1799        // Connect to a server as 2 clients.
1800        let mut server = TestServer::start().await;
1801        let (client_a, user_store_a) = server.create_client(&mut cx_a, "user_a").await;
1802        let (client_b, user_store_b) = server.create_client(&mut cx_b, "user_b").await;
1803        let mut status_b = client_b.status();
1804
1805        // Create an org that includes these 2 users.
1806        let db = &server.app_state.db;
1807        let org_id = db.create_org("Test Org", "test-org").await.unwrap();
1808        db.add_org_member(org_id, current_user_id(&user_store_a, &cx_a), false)
1809            .await
1810            .unwrap();
1811        db.add_org_member(org_id, current_user_id(&user_store_b, &cx_b), false)
1812            .await
1813            .unwrap();
1814
1815        // Create a channel that includes all the users.
1816        let channel_id = db.create_org_channel(org_id, "test-channel").await.unwrap();
1817        db.add_channel_member(channel_id, current_user_id(&user_store_a, &cx_a), false)
1818            .await
1819            .unwrap();
1820        db.add_channel_member(channel_id, current_user_id(&user_store_b, &cx_b), false)
1821            .await
1822            .unwrap();
1823        db.create_channel_message(
1824            channel_id,
1825            current_user_id(&user_store_b, &cx_b),
1826            "hello A, it's B.",
1827            OffsetDateTime::now_utc(),
1828            2,
1829        )
1830        .await
1831        .unwrap();
1832
1833        let channels_a = cx_a.add_model(|cx| ChannelList::new(user_store_a, client_a, cx));
1834        channels_a
1835            .condition(&mut cx_a, |list, _| list.available_channels().is_some())
1836            .await;
1837
1838        channels_a.read_with(&cx_a, |list, _| {
1839            assert_eq!(
1840                list.available_channels().unwrap(),
1841                &[ChannelDetails {
1842                    id: channel_id.to_proto(),
1843                    name: "test-channel".to_string()
1844                }]
1845            )
1846        });
1847        let channel_a = channels_a.update(&mut cx_a, |this, cx| {
1848            this.get_channel(channel_id.to_proto(), cx).unwrap()
1849        });
1850        channel_a.read_with(&cx_a, |channel, _| assert!(channel.messages().is_empty()));
1851        channel_a
1852            .condition(&cx_a, |channel, _| {
1853                channel_messages(channel)
1854                    == [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1855            })
1856            .await;
1857
1858        let channels_b = cx_b.add_model(|cx| ChannelList::new(user_store_b.clone(), client_b, cx));
1859        channels_b
1860            .condition(&mut cx_b, |list, _| list.available_channels().is_some())
1861            .await;
1862        channels_b.read_with(&cx_b, |list, _| {
1863            assert_eq!(
1864                list.available_channels().unwrap(),
1865                &[ChannelDetails {
1866                    id: channel_id.to_proto(),
1867                    name: "test-channel".to_string()
1868                }]
1869            )
1870        });
1871
1872        let channel_b = channels_b.update(&mut cx_b, |this, cx| {
1873            this.get_channel(channel_id.to_proto(), cx).unwrap()
1874        });
1875        channel_b.read_with(&cx_b, |channel, _| assert!(channel.messages().is_empty()));
1876        channel_b
1877            .condition(&cx_b, |channel, _| {
1878                channel_messages(channel)
1879                    == [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1880            })
1881            .await;
1882
1883        // Disconnect client B, ensuring we can still access its cached channel data.
1884        server.forbid_connections();
1885        server.disconnect_client(current_user_id(&user_store_b, &cx_b));
1886        while !matches!(
1887            status_b.recv().await,
1888            Some(client::Status::ReconnectionError { .. })
1889        ) {}
1890
1891        channels_b.read_with(&cx_b, |channels, _| {
1892            assert_eq!(
1893                channels.available_channels().unwrap(),
1894                [ChannelDetails {
1895                    id: channel_id.to_proto(),
1896                    name: "test-channel".to_string()
1897                }]
1898            )
1899        });
1900        channel_b.read_with(&cx_b, |channel, _| {
1901            assert_eq!(
1902                channel_messages(channel),
1903                [("user_b".to_string(), "hello A, it's B.".to_string(), false)]
1904            )
1905        });
1906
1907        // Send a message from client B while it is disconnected.
1908        channel_b
1909            .update(&mut cx_b, |channel, cx| {
1910                let task = channel
1911                    .send_message("can you see this?".to_string(), cx)
1912                    .unwrap();
1913                assert_eq!(
1914                    channel_messages(channel),
1915                    &[
1916                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1917                        ("user_b".to_string(), "can you see this?".to_string(), true)
1918                    ]
1919                );
1920                task
1921            })
1922            .await
1923            .unwrap_err();
1924
1925        // Send a message from client A while B is disconnected.
1926        channel_a
1927            .update(&mut cx_a, |channel, cx| {
1928                channel
1929                    .send_message("oh, hi B.".to_string(), cx)
1930                    .unwrap()
1931                    .detach();
1932                let task = channel.send_message("sup".to_string(), cx).unwrap();
1933                assert_eq!(
1934                    channel_messages(channel),
1935                    &[
1936                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1937                        ("user_a".to_string(), "oh, hi B.".to_string(), true),
1938                        ("user_a".to_string(), "sup".to_string(), true)
1939                    ]
1940                );
1941                task
1942            })
1943            .await
1944            .unwrap();
1945
1946        // Give client B a chance to reconnect.
1947        server.allow_connections();
1948        cx_b.foreground().advance_clock(Duration::from_secs(10));
1949
1950        // Verify that B sees the new messages upon reconnection, as well as the message client B
1951        // sent while offline.
1952        channel_b
1953            .condition(&cx_b, |channel, _| {
1954                channel_messages(channel)
1955                    == [
1956                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1957                        ("user_a".to_string(), "oh, hi B.".to_string(), false),
1958                        ("user_a".to_string(), "sup".to_string(), false),
1959                        ("user_b".to_string(), "can you see this?".to_string(), false),
1960                    ]
1961            })
1962            .await;
1963
1964        // Ensure client A and B can communicate normally after reconnection.
1965        channel_a
1966            .update(&mut cx_a, |channel, cx| {
1967                channel.send_message("you online?".to_string(), cx).unwrap()
1968            })
1969            .await
1970            .unwrap();
1971        channel_b
1972            .condition(&cx_b, |channel, _| {
1973                channel_messages(channel)
1974                    == [
1975                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1976                        ("user_a".to_string(), "oh, hi B.".to_string(), false),
1977                        ("user_a".to_string(), "sup".to_string(), false),
1978                        ("user_b".to_string(), "can you see this?".to_string(), false),
1979                        ("user_a".to_string(), "you online?".to_string(), false),
1980                    ]
1981            })
1982            .await;
1983
1984        channel_b
1985            .update(&mut cx_b, |channel, cx| {
1986                channel.send_message("yep".to_string(), cx).unwrap()
1987            })
1988            .await
1989            .unwrap();
1990        channel_a
1991            .condition(&cx_a, |channel, _| {
1992                channel_messages(channel)
1993                    == [
1994                        ("user_b".to_string(), "hello A, it's B.".to_string(), false),
1995                        ("user_a".to_string(), "oh, hi B.".to_string(), false),
1996                        ("user_a".to_string(), "sup".to_string(), false),
1997                        ("user_b".to_string(), "can you see this?".to_string(), false),
1998                        ("user_a".to_string(), "you online?".to_string(), false),
1999                        ("user_b".to_string(), "yep".to_string(), false),
2000                    ]
2001            })
2002            .await;
2003    }
2004
2005    #[gpui::test]
2006    async fn test_collaborators(
2007        mut cx_a: TestAppContext,
2008        mut cx_b: TestAppContext,
2009        mut cx_c: TestAppContext,
2010    ) {
2011        cx_a.foreground().forbid_parking();
2012        let lang_registry = Arc::new(LanguageRegistry::new());
2013
2014        // Connect to a server as 3 clients.
2015        let mut server = TestServer::start().await;
2016        let (client_a, user_store_a) = server.create_client(&mut cx_a, "user_a").await;
2017        let (client_b, user_store_b) = server.create_client(&mut cx_b, "user_b").await;
2018        let (_client_c, user_store_c) = server.create_client(&mut cx_c, "user_c").await;
2019
2020        let fs = Arc::new(FakeFs::new());
2021
2022        // Share a worktree as client A.
2023        fs.insert_tree(
2024            "/a",
2025            json!({
2026                ".zed.toml": r#"collaborators = ["user_b", "user_c"]"#,
2027            }),
2028        )
2029        .await;
2030
2031        let worktree_a = Worktree::open_local(
2032            client_a.clone(),
2033            "/a".as_ref(),
2034            fs.clone(),
2035            lang_registry.clone(),
2036            &mut cx_a.to_async(),
2037        )
2038        .await
2039        .unwrap();
2040
2041        user_store_a
2042            .condition(&cx_a, |user_store, _| {
2043                collaborators(user_store) == vec![("user_a", vec![("a", vec![])])]
2044            })
2045            .await;
2046        user_store_b
2047            .condition(&cx_b, |user_store, _| {
2048                collaborators(user_store) == vec![("user_a", vec![("a", vec![])])]
2049            })
2050            .await;
2051        user_store_c
2052            .condition(&cx_c, |user_store, _| {
2053                collaborators(user_store) == vec![("user_a", vec![("a", vec![])])]
2054            })
2055            .await;
2056
2057        let worktree_id = worktree_a
2058            .update(&mut cx_a, |tree, cx| tree.as_local_mut().unwrap().share(cx))
2059            .await
2060            .unwrap();
2061
2062        let _worktree_b = Worktree::open_remote(
2063            client_b.clone(),
2064            worktree_id,
2065            lang_registry.clone(),
2066            &mut cx_b.to_async(),
2067        )
2068        .await
2069        .unwrap();
2070
2071        user_store_a
2072            .condition(&cx_a, |user_store, _| {
2073                collaborators(user_store) == vec![("user_a", vec![("a", vec!["user_b"])])]
2074            })
2075            .await;
2076        user_store_b
2077            .condition(&cx_b, |user_store, _| {
2078                collaborators(user_store) == vec![("user_a", vec![("a", vec!["user_b"])])]
2079            })
2080            .await;
2081        user_store_c
2082            .condition(&cx_c, |user_store, _| {
2083                collaborators(user_store) == vec![("user_a", vec![("a", vec!["user_b"])])]
2084            })
2085            .await;
2086
2087        cx_a.update(move |_| drop(worktree_a));
2088        user_store_a
2089            .condition(&cx_a, |user_store, _| collaborators(user_store) == vec![])
2090            .await;
2091        user_store_b
2092            .condition(&cx_b, |user_store, _| collaborators(user_store) == vec![])
2093            .await;
2094        user_store_c
2095            .condition(&cx_c, |user_store, _| collaborators(user_store) == vec![])
2096            .await;
2097
2098        fn collaborators(user_store: &UserStore) -> Vec<(&str, Vec<(&str, Vec<&str>)>)> {
2099            user_store
2100                .collaborators()
2101                .iter()
2102                .map(|collaborator| {
2103                    let worktrees = collaborator
2104                        .worktrees
2105                        .iter()
2106                        .map(|w| {
2107                            (
2108                                w.root_name.as_str(),
2109                                w.guests.iter().map(|p| p.github_login.as_str()).collect(),
2110                            )
2111                        })
2112                        .collect();
2113                    (collaborator.user.github_login.as_str(), worktrees)
2114                })
2115                .collect()
2116        }
2117    }
2118
2119    struct TestServer {
2120        peer: Arc<Peer>,
2121        app_state: Arc<AppState>,
2122        server: Arc<Server>,
2123        notifications: mpsc::Receiver<()>,
2124        connection_killers: Arc<Mutex<HashMap<UserId, watch::Sender<Option<()>>>>>,
2125        forbid_connections: Arc<AtomicBool>,
2126        _test_db: TestDb,
2127    }
2128
2129    impl TestServer {
2130        async fn start() -> Self {
2131            let test_db = TestDb::new();
2132            let app_state = Self::build_app_state(&test_db).await;
2133            let peer = Peer::new();
2134            let notifications = mpsc::channel(128);
2135            let server = Server::new(app_state.clone(), peer.clone(), Some(notifications.0));
2136            Self {
2137                peer,
2138                app_state,
2139                server,
2140                notifications: notifications.1,
2141                connection_killers: Default::default(),
2142                forbid_connections: Default::default(),
2143                _test_db: test_db,
2144            }
2145        }
2146
2147        async fn create_client(
2148            &mut self,
2149            cx: &mut TestAppContext,
2150            name: &str,
2151        ) -> (Arc<Client>, ModelHandle<UserStore>) {
2152            let user_id = self.app_state.db.create_user(name, false).await.unwrap();
2153            let client_name = name.to_string();
2154            let mut client = Client::new();
2155            let server = self.server.clone();
2156            let connection_killers = self.connection_killers.clone();
2157            let forbid_connections = self.forbid_connections.clone();
2158            Arc::get_mut(&mut client)
2159                .unwrap()
2160                .override_authenticate(move |cx| {
2161                    cx.spawn(|_| async move {
2162                        let access_token = "the-token".to_string();
2163                        Ok(Credentials {
2164                            user_id: user_id.0 as u64,
2165                            access_token,
2166                        })
2167                    })
2168                })
2169                .override_establish_connection(move |credentials, cx| {
2170                    assert_eq!(credentials.user_id, user_id.0 as u64);
2171                    assert_eq!(credentials.access_token, "the-token");
2172
2173                    let server = server.clone();
2174                    let connection_killers = connection_killers.clone();
2175                    let forbid_connections = forbid_connections.clone();
2176                    let client_name = client_name.clone();
2177                    cx.spawn(move |cx| async move {
2178                        if forbid_connections.load(SeqCst) {
2179                            Err(EstablishConnectionError::other(anyhow!(
2180                                "server is forbidding connections"
2181                            )))
2182                        } else {
2183                            let (client_conn, server_conn, kill_conn) = Connection::in_memory();
2184                            connection_killers.lock().insert(user_id, kill_conn);
2185                            cx.background()
2186                                .spawn(server.handle_connection(server_conn, client_name, user_id))
2187                                .detach();
2188                            Ok(client_conn)
2189                        }
2190                    })
2191                });
2192
2193            let http = FakeHttpClient::new(|_| async move { Ok(surf::http::Response::new(404)) });
2194            client
2195                .authenticate_and_connect(&cx.to_async())
2196                .await
2197                .unwrap();
2198
2199            let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http, cx));
2200            let mut authed_user =
2201                user_store.read_with(cx, |user_store, _| user_store.watch_current_user());
2202            while authed_user.recv().await.unwrap().is_none() {}
2203
2204            (client, user_store)
2205        }
2206
2207        fn disconnect_client(&self, user_id: UserId) {
2208            if let Some(mut kill_conn) = self.connection_killers.lock().remove(&user_id) {
2209                let _ = kill_conn.try_send(Some(()));
2210            }
2211        }
2212
2213        fn forbid_connections(&self) {
2214            self.forbid_connections.store(true, SeqCst);
2215        }
2216
2217        fn allow_connections(&self) {
2218            self.forbid_connections.store(false, SeqCst);
2219        }
2220
2221        async fn build_app_state(test_db: &TestDb) -> Arc<AppState> {
2222            let mut config = Config::default();
2223            config.session_secret = "a".repeat(32);
2224            config.database_url = test_db.url.clone();
2225            let github_client = github::AppClient::test();
2226            Arc::new(AppState {
2227                db: test_db.db().clone(),
2228                handlebars: Default::default(),
2229                auth_client: auth::build_client("", ""),
2230                repo_client: github::RepoClient::test(&github_client),
2231                github_client,
2232                config,
2233            })
2234        }
2235
2236        async fn state<'a>(&'a self) -> RwLockReadGuard<'a, Store> {
2237            self.server.store.read().await
2238        }
2239
2240        async fn condition<F>(&mut self, mut predicate: F)
2241        where
2242            F: FnMut(&Store) -> bool,
2243        {
2244            async_std::future::timeout(Duration::from_millis(500), async {
2245                while !(predicate)(&*self.server.store.read().await) {
2246                    self.notifications.recv().await;
2247                }
2248            })
2249            .await
2250            .expect("condition timed out");
2251        }
2252    }
2253
2254    impl Drop for TestServer {
2255        fn drop(&mut self) {
2256            task::block_on(self.peer.reset());
2257        }
2258    }
2259
2260    fn current_user_id(user_store: &ModelHandle<UserStore>, cx: &TestAppContext) -> UserId {
2261        UserId::from_proto(
2262            user_store.read_with(cx, |user_store, _| user_store.current_user().unwrap().id),
2263        )
2264    }
2265
2266    fn channel_messages(channel: &Channel) -> Vec<(String, String, bool)> {
2267        channel
2268            .messages()
2269            .cursor::<()>()
2270            .map(|m| {
2271                (
2272                    m.sender.github_login.clone(),
2273                    m.body.clone(),
2274                    m.is_pending(),
2275                )
2276            })
2277            .collect()
2278    }
2279
2280    struct EmptyView;
2281
2282    impl gpui::Entity for EmptyView {
2283        type Event = ();
2284    }
2285
2286    impl gpui::View for EmptyView {
2287        fn ui_name() -> &'static str {
2288            "empty view"
2289        }
2290
2291        fn render(&mut self, _: &mut gpui::RenderContext<Self>) -> gpui::ElementBox {
2292            gpui::Element::boxed(gpui::elements::Empty)
2293        }
2294    }
2295}