1mod store;
   2
   3use crate::{
   4    auth,
   5    db::{self, ChannelId, MessageId, ProjectId, User, UserId},
   6    AppState, Result,
   7};
   8use anyhow::{anyhow, Context};
   9use async_tungstenite::tungstenite::{
  10    protocol::CloseFrame as TungsteniteCloseFrame, Message as TungsteniteMessage,
  11};
  12use axum::{
  13    body::Body,
  14    extract::{
  15        ws::{CloseFrame as AxumCloseFrame, Message as AxumMessage},
  16        ConnectInfo, WebSocketUpgrade,
  17    },
  18    headers::{Header, HeaderName},
  19    http::StatusCode,
  20    middleware,
  21    response::IntoResponse,
  22    routing::get,
  23    Extension, Router, TypedHeader,
  24};
  25use collections::{HashMap, HashSet};
  26use futures::{
  27    channel::mpsc,
  28    future::{self, BoxFuture},
  29    stream::FuturesUnordered,
  30    FutureExt, SinkExt, StreamExt, TryStreamExt,
  31};
  32use lazy_static::lazy_static;
  33use prometheus::{register_int_gauge, IntGauge};
  34use rpc::{
  35    proto::{self, AnyTypedEnvelope, EntityMessage, EnvelopedMessage, RequestMessage},
  36    Connection, ConnectionId, Peer, Receipt, TypedEnvelope,
  37};
  38use serde::{Serialize, Serializer};
  39use std::{
  40    any::TypeId,
  41    future::Future,
  42    marker::PhantomData,
  43    net::SocketAddr,
  44    ops::{Deref, DerefMut},
  45    rc::Rc,
  46    sync::{
  47        atomic::{AtomicBool, Ordering::SeqCst},
  48        Arc,
  49    },
  50    time::Duration,
  51};
  52pub use store::{Store, Worktree};
  53use time::OffsetDateTime;
  54use tokio::{
  55    sync::{Mutex, MutexGuard},
  56    time::Sleep,
  57};
  58use tower::ServiceBuilder;
  59use tracing::{info_span, instrument, Instrument};
  60
  61lazy_static! {
  62    static ref METRIC_CONNECTIONS: IntGauge =
  63        register_int_gauge!("connections", "number of connections").unwrap();
  64    static ref METRIC_REGISTERED_PROJECTS: IntGauge =
  65        register_int_gauge!("registered_projects", "number of registered projects").unwrap();
  66    static ref METRIC_ACTIVE_PROJECTS: IntGauge =
  67        register_int_gauge!("active_projects", "number of active projects").unwrap();
  68    static ref METRIC_SHARED_PROJECTS: IntGauge = register_int_gauge!(
  69        "shared_projects",
  70        "number of open projects with one or more guests"
  71    )
  72    .unwrap();
  73}
  74
  75type MessageHandler =
  76    Box<dyn Send + Sync + Fn(Arc<Server>, Box<dyn AnyTypedEnvelope>) -> BoxFuture<'static, ()>>;
  77
  78struct Response<R> {
  79    server: Arc<Server>,
  80    receipt: Receipt<R>,
  81    responded: Arc<AtomicBool>,
  82}
  83
  84impl<R: RequestMessage> Response<R> {
  85    fn send(self, payload: R::Response) -> Result<()> {
  86        self.responded.store(true, SeqCst);
  87        self.server.peer.respond(self.receipt, payload)?;
  88        Ok(())
  89    }
  90}
  91
  92pub struct Server {
  93    peer: Arc<Peer>,
  94    pub(crate) store: Mutex<Store>,
  95    app_state: Arc<AppState>,
  96    handlers: HashMap<TypeId, MessageHandler>,
  97    notifications: Option<mpsc::UnboundedSender<()>>,
  98}
  99
 100pub trait Executor: Send + Clone {
 101    type Sleep: Send + Future;
 102    fn spawn_detached<F: 'static + Send + Future<Output = ()>>(&self, future: F);
 103    fn sleep(&self, duration: Duration) -> Self::Sleep;
 104}
 105
 106#[derive(Clone)]
 107pub struct RealExecutor;
 108
 109const MESSAGE_COUNT_PER_PAGE: usize = 100;
 110const MAX_MESSAGE_LEN: usize = 1024;
 111
 112pub(crate) struct StoreGuard<'a> {
 113    guard: MutexGuard<'a, Store>,
 114    _not_send: PhantomData<Rc<()>>,
 115}
 116
 117#[derive(Serialize)]
 118pub struct ServerSnapshot<'a> {
 119    peer: &'a Peer,
 120    #[serde(serialize_with = "serialize_deref")]
 121    store: StoreGuard<'a>,
 122}
 123
 124pub fn serialize_deref<S, T, U>(value: &T, serializer: S) -> Result<S::Ok, S::Error>
 125where
 126    S: Serializer,
 127    T: Deref<Target = U>,
 128    U: Serialize,
 129{
 130    Serialize::serialize(value.deref(), serializer)
 131}
 132
 133impl Server {
 134    pub fn new(
 135        app_state: Arc<AppState>,
 136        notifications: Option<mpsc::UnboundedSender<()>>,
 137    ) -> Arc<Self> {
 138        let mut server = Self {
 139            peer: Peer::new(),
 140            app_state,
 141            store: Default::default(),
 142            handlers: Default::default(),
 143            notifications,
 144        };
 145
 146        server
 147            .add_request_handler(Server::ping)
 148            .add_request_handler(Server::create_room)
 149            .add_request_handler(Server::join_room)
 150            .add_message_handler(Server::leave_room)
 151            .add_request_handler(Server::call)
 152            .add_request_handler(Server::cancel_call)
 153            .add_message_handler(Server::decline_call)
 154            .add_request_handler(Server::update_participant_location)
 155            .add_request_handler(Server::share_project)
 156            .add_message_handler(Server::unshare_project)
 157            .add_request_handler(Server::join_project)
 158            .add_message_handler(Server::leave_project)
 159            .add_message_handler(Server::update_project)
 160            .add_message_handler(Server::register_project_activity)
 161            .add_request_handler(Server::update_worktree)
 162            .add_message_handler(Server::update_worktree_extensions)
 163            .add_message_handler(Server::start_language_server)
 164            .add_message_handler(Server::update_language_server)
 165            .add_message_handler(Server::update_diagnostic_summary)
 166            .add_request_handler(Server::forward_project_request::<proto::GetHover>)
 167            .add_request_handler(Server::forward_project_request::<proto::GetDefinition>)
 168            .add_request_handler(Server::forward_project_request::<proto::GetTypeDefinition>)
 169            .add_request_handler(Server::forward_project_request::<proto::GetReferences>)
 170            .add_request_handler(Server::forward_project_request::<proto::SearchProject>)
 171            .add_request_handler(Server::forward_project_request::<proto::GetDocumentHighlights>)
 172            .add_request_handler(Server::forward_project_request::<proto::GetProjectSymbols>)
 173            .add_request_handler(Server::forward_project_request::<proto::OpenBufferForSymbol>)
 174            .add_request_handler(Server::forward_project_request::<proto::OpenBufferById>)
 175            .add_request_handler(Server::forward_project_request::<proto::OpenBufferByPath>)
 176            .add_request_handler(Server::forward_project_request::<proto::GetCompletions>)
 177            .add_request_handler(
 178                Server::forward_project_request::<proto::ApplyCompletionAdditionalEdits>,
 179            )
 180            .add_request_handler(Server::forward_project_request::<proto::GetCodeActions>)
 181            .add_request_handler(Server::forward_project_request::<proto::ApplyCodeAction>)
 182            .add_request_handler(Server::forward_project_request::<proto::PrepareRename>)
 183            .add_request_handler(Server::forward_project_request::<proto::PerformRename>)
 184            .add_request_handler(Server::forward_project_request::<proto::ReloadBuffers>)
 185            .add_request_handler(Server::forward_project_request::<proto::FormatBuffers>)
 186            .add_request_handler(Server::forward_project_request::<proto::CreateProjectEntry>)
 187            .add_request_handler(Server::forward_project_request::<proto::RenameProjectEntry>)
 188            .add_request_handler(Server::forward_project_request::<proto::CopyProjectEntry>)
 189            .add_request_handler(Server::forward_project_request::<proto::DeleteProjectEntry>)
 190            .add_message_handler(Server::create_buffer_for_peer)
 191            .add_request_handler(Server::update_buffer)
 192            .add_message_handler(Server::update_buffer_file)
 193            .add_message_handler(Server::buffer_reloaded)
 194            .add_message_handler(Server::buffer_saved)
 195            .add_request_handler(Server::save_buffer)
 196            .add_request_handler(Server::get_channels)
 197            .add_request_handler(Server::get_users)
 198            .add_request_handler(Server::fuzzy_search_users)
 199            .add_request_handler(Server::request_contact)
 200            .add_request_handler(Server::remove_contact)
 201            .add_request_handler(Server::respond_to_contact_request)
 202            .add_request_handler(Server::join_channel)
 203            .add_message_handler(Server::leave_channel)
 204            .add_request_handler(Server::send_channel_message)
 205            .add_request_handler(Server::follow)
 206            .add_message_handler(Server::unfollow)
 207            .add_message_handler(Server::update_followers)
 208            .add_request_handler(Server::get_channel_messages)
 209            .add_message_handler(Server::update_diff_base)
 210            .add_request_handler(Server::get_private_user_info);
 211
 212        Arc::new(server)
 213    }
 214
 215    fn add_message_handler<F, Fut, M>(&mut self, handler: F) -> &mut Self
 216    where
 217        F: 'static + Send + Sync + Fn(Arc<Self>, TypedEnvelope<M>) -> Fut,
 218        Fut: 'static + Send + Future<Output = Result<()>>,
 219        M: EnvelopedMessage,
 220    {
 221        let prev_handler = self.handlers.insert(
 222            TypeId::of::<M>(),
 223            Box::new(move |server, envelope| {
 224                let envelope = envelope.into_any().downcast::<TypedEnvelope<M>>().unwrap();
 225                let span = info_span!(
 226                    "handle message",
 227                    payload_type = envelope.payload_type_name()
 228                );
 229                span.in_scope(|| {
 230                    tracing::info!(
 231                        payload_type = envelope.payload_type_name(),
 232                        "message received"
 233                    );
 234                });
 235                let future = (handler)(server, *envelope);
 236                async move {
 237                    if let Err(error) = future.await {
 238                        tracing::error!(%error, "error handling message");
 239                    }
 240                }
 241                .instrument(span)
 242                .boxed()
 243            }),
 244        );
 245        if prev_handler.is_some() {
 246            panic!("registered a handler for the same message twice");
 247        }
 248        self
 249    }
 250
 251    /// Handle a request while holding a lock to the store. This is useful when we're registering
 252    /// a connection but we want to respond on the connection before anybody else can send on it.
 253    fn add_request_handler<F, Fut, M>(&mut self, handler: F) -> &mut Self
 254    where
 255        F: 'static + Send + Sync + Fn(Arc<Self>, TypedEnvelope<M>, Response<M>) -> Fut,
 256        Fut: Send + Future<Output = Result<()>>,
 257        M: RequestMessage,
 258    {
 259        let handler = Arc::new(handler);
 260        self.add_message_handler(move |server, envelope| {
 261            let receipt = envelope.receipt();
 262            let handler = handler.clone();
 263            async move {
 264                let responded = Arc::new(AtomicBool::default());
 265                let response = Response {
 266                    server: server.clone(),
 267                    responded: responded.clone(),
 268                    receipt: envelope.receipt(),
 269                };
 270                match (handler)(server.clone(), envelope, response).await {
 271                    Ok(()) => {
 272                        if responded.load(std::sync::atomic::Ordering::SeqCst) {
 273                            Ok(())
 274                        } else {
 275                            Err(anyhow!("handler did not send a response"))?
 276                        }
 277                    }
 278                    Err(error) => {
 279                        server.peer.respond_with_error(
 280                            receipt,
 281                            proto::Error {
 282                                message: error.to_string(),
 283                            },
 284                        )?;
 285                        Err(error)
 286                    }
 287                }
 288            }
 289        })
 290    }
 291
 292    /// Start a long lived task that records which users are active in which projects.
 293    pub fn start_recording_project_activity<E: 'static + Executor>(
 294        self: &Arc<Self>,
 295        interval: Duration,
 296        executor: E,
 297    ) {
 298        executor.spawn_detached({
 299            let this = Arc::downgrade(self);
 300            let executor = executor.clone();
 301            async move {
 302                let mut period_start = OffsetDateTime::now_utc();
 303                let mut active_projects = Vec::<(UserId, ProjectId)>::new();
 304                loop {
 305                    let sleep = executor.sleep(interval);
 306                    sleep.await;
 307                    let this = if let Some(this) = this.upgrade() {
 308                        this
 309                    } else {
 310                        break;
 311                    };
 312
 313                    active_projects.clear();
 314                    active_projects.extend(this.store().await.projects().flat_map(
 315                        |(project_id, project)| {
 316                            project.guests.values().chain([&project.host]).filter_map(
 317                                |collaborator| {
 318                                    if !collaborator.admin
 319                                        && collaborator
 320                                            .last_activity
 321                                            .map_or(false, |activity| activity > period_start)
 322                                    {
 323                                        Some((collaborator.user_id, *project_id))
 324                                    } else {
 325                                        None
 326                                    }
 327                                },
 328                            )
 329                        },
 330                    ));
 331
 332                    let period_end = OffsetDateTime::now_utc();
 333                    this.app_state
 334                        .db
 335                        .record_user_activity(period_start..period_end, &active_projects)
 336                        .await
 337                        .trace_err();
 338                    period_start = period_end;
 339                }
 340            }
 341        });
 342    }
 343
 344    pub fn handle_connection<E: Executor>(
 345        self: &Arc<Self>,
 346        connection: Connection,
 347        address: String,
 348        user: User,
 349        mut send_connection_id: Option<mpsc::Sender<ConnectionId>>,
 350        executor: E,
 351    ) -> impl Future<Output = Result<()>> {
 352        let mut this = self.clone();
 353        let user_id = user.id;
 354        let login = user.github_login;
 355        let span = info_span!("handle connection", %user_id, %login, %address);
 356        async move {
 357            let (connection_id, handle_io, mut incoming_rx) = this
 358                .peer
 359                .add_connection(connection, {
 360                    let executor = executor.clone();
 361                    move |duration| {
 362                        let timer = executor.sleep(duration);
 363                        async move {
 364                            timer.await;
 365                        }
 366                    }
 367                });
 368
 369            tracing::info!(%user_id, %login, %connection_id, %address, "connection opened");
 370
 371            if let Some(send_connection_id) = send_connection_id.as_mut() {
 372                let _ = send_connection_id.send(connection_id).await;
 373            }
 374
 375            if !user.connected_once {
 376                this.peer.send(connection_id, proto::ShowContacts {})?;
 377                this.app_state.db.set_user_connected_once(user_id, true).await?;
 378            }
 379
 380            let (contacts, invite_code) = future::try_join(
 381                this.app_state.db.get_contacts(user_id),
 382                this.app_state.db.get_invite_code_for_user(user_id)
 383            ).await?;
 384
 385            {
 386                let mut store = this.store().await;
 387                let incoming_call = store.add_connection(connection_id, user_id, user.admin);
 388                if let Some(incoming_call) = incoming_call {
 389                    this.peer.send(connection_id, incoming_call)?;
 390                }
 391
 392                this.peer.send(connection_id, store.build_initial_contacts_update(contacts))?;
 393
 394                if let Some((code, count)) = invite_code {
 395                    this.peer.send(connection_id, proto::UpdateInviteInfo {
 396                        url: format!("{}{}", this.app_state.invite_link_prefix, code),
 397                        count,
 398                    })?;
 399                }
 400            }
 401            this.update_user_contacts(user_id).await?;
 402
 403            let handle_io = handle_io.fuse();
 404            futures::pin_mut!(handle_io);
 405
 406            // Handlers for foreground messages are pushed into the following `FuturesUnordered`.
 407            // This prevents deadlocks when e.g., client A performs a request to client B and
 408            // client B performs a request to client A. If both clients stop processing further
 409            // messages until their respective request completes, they won't have a chance to
 410            // respond to the other client's request and cause a deadlock.
 411            //
 412            // This arrangement ensures we will attempt to process earlier messages first, but fall
 413            // back to processing messages arrived later in the spirit of making progress.
 414            let mut foreground_message_handlers = FuturesUnordered::new();
 415            loop {
 416                let next_message = incoming_rx.next().fuse();
 417                futures::pin_mut!(next_message);
 418                futures::select_biased! {
 419                    result = handle_io => {
 420                        if let Err(error) = result {
 421                            tracing::error!(?error, %user_id, %login, %connection_id, %address, "error handling I/O");
 422                        }
 423                        break;
 424                    }
 425                    _ = foreground_message_handlers.next() => {}
 426                    message = next_message => {
 427                        if let Some(message) = message {
 428                            let type_name = message.payload_type_name();
 429                            let span = tracing::info_span!("receive message", %user_id, %login, %connection_id, %address, type_name);
 430                            let span_enter = span.enter();
 431                            if let Some(handler) = this.handlers.get(&message.payload_type_id()) {
 432                                let notifications = this.notifications.clone();
 433                                let is_background = message.is_background();
 434                                let handle_message = (handler)(this.clone(), message);
 435
 436                                drop(span_enter);
 437                                let handle_message = async move {
 438                                    handle_message.await;
 439                                    if let Some(mut notifications) = notifications {
 440                                        let _ = notifications.send(()).await;
 441                                    }
 442                                }.instrument(span);
 443
 444                                if is_background {
 445                                    executor.spawn_detached(handle_message);
 446                                } else {
 447                                    foreground_message_handlers.push(handle_message);
 448                                }
 449                            } else {
 450                                tracing::error!(%user_id, %login, %connection_id, %address, "no message handler");
 451                            }
 452                        } else {
 453                            tracing::info!(%user_id, %login, %connection_id, %address, "connection closed");
 454                            break;
 455                        }
 456                    }
 457                }
 458            }
 459
 460            drop(foreground_message_handlers);
 461            tracing::info!(%user_id, %login, %connection_id, %address, "signing out");
 462            if let Err(error) = this.sign_out(connection_id).await {
 463                tracing::error!(%user_id, %login, %connection_id, %address, ?error, "error signing out");
 464            }
 465
 466            Ok(())
 467        }.instrument(span)
 468    }
 469
 470    #[instrument(skip(self), err)]
 471    async fn sign_out(self: &mut Arc<Self>, connection_id: ConnectionId) -> Result<()> {
 472        self.peer.disconnect(connection_id);
 473
 474        let mut projects_to_unshare = Vec::new();
 475        let mut contacts_to_update = HashSet::default();
 476        let mut room_left = None;
 477        {
 478            let mut store = self.store().await;
 479            let removed_connection = store.remove_connection(connection_id)?;
 480
 481            for project in removed_connection.hosted_projects {
 482                projects_to_unshare.push(project.id);
 483                broadcast(connection_id, project.guests.keys().copied(), |conn_id| {
 484                    self.peer.send(
 485                        conn_id,
 486                        proto::UnshareProject {
 487                            project_id: project.id.to_proto(),
 488                        },
 489                    )
 490                });
 491            }
 492
 493            for project in removed_connection.guest_projects {
 494                broadcast(connection_id, project.connection_ids, |conn_id| {
 495                    self.peer.send(
 496                        conn_id,
 497                        proto::RemoveProjectCollaborator {
 498                            project_id: project.id.to_proto(),
 499                            peer_id: connection_id.0,
 500                        },
 501                    )
 502                });
 503            }
 504
 505            if let Some(room) = removed_connection.room {
 506                self.room_updated(&room);
 507                room_left = Some(self.room_left(&room, removed_connection.user_id));
 508            }
 509
 510            contacts_to_update.insert(removed_connection.user_id);
 511            for connection_id in removed_connection.canceled_call_connection_ids {
 512                self.peer
 513                    .send(connection_id, proto::CallCanceled {})
 514                    .trace_err();
 515                contacts_to_update.extend(store.user_id_for_connection(connection_id).ok());
 516            }
 517        };
 518
 519        if let Some(room_left) = room_left {
 520            room_left.await.trace_err();
 521        }
 522
 523        for user_id in contacts_to_update {
 524            self.update_user_contacts(user_id).await.trace_err();
 525        }
 526
 527        for project_id in projects_to_unshare {
 528            self.app_state
 529                .db
 530                .unregister_project(project_id)
 531                .await
 532                .trace_err();
 533        }
 534
 535        Ok(())
 536    }
 537
 538    pub async fn invite_code_redeemed(
 539        self: &Arc<Self>,
 540        inviter_id: UserId,
 541        invitee_id: UserId,
 542    ) -> Result<()> {
 543        if let Some(user) = self.app_state.db.get_user_by_id(inviter_id).await? {
 544            if let Some(code) = &user.invite_code {
 545                let store = self.store().await;
 546                let invitee_contact = store.contact_for_user(invitee_id, true);
 547                for connection_id in store.connection_ids_for_user(inviter_id) {
 548                    self.peer.send(
 549                        connection_id,
 550                        proto::UpdateContacts {
 551                            contacts: vec![invitee_contact.clone()],
 552                            ..Default::default()
 553                        },
 554                    )?;
 555                    self.peer.send(
 556                        connection_id,
 557                        proto::UpdateInviteInfo {
 558                            url: format!("{}{}", self.app_state.invite_link_prefix, &code),
 559                            count: user.invite_count as u32,
 560                        },
 561                    )?;
 562                }
 563            }
 564        }
 565        Ok(())
 566    }
 567
 568    pub async fn invite_count_updated(self: &Arc<Self>, user_id: UserId) -> Result<()> {
 569        if let Some(user) = self.app_state.db.get_user_by_id(user_id).await? {
 570            if let Some(invite_code) = &user.invite_code {
 571                let store = self.store().await;
 572                for connection_id in store.connection_ids_for_user(user_id) {
 573                    self.peer.send(
 574                        connection_id,
 575                        proto::UpdateInviteInfo {
 576                            url: format!("{}{}", self.app_state.invite_link_prefix, invite_code),
 577                            count: user.invite_count as u32,
 578                        },
 579                    )?;
 580                }
 581            }
 582        }
 583        Ok(())
 584    }
 585
 586    async fn ping(
 587        self: Arc<Server>,
 588        _: TypedEnvelope<proto::Ping>,
 589        response: Response<proto::Ping>,
 590    ) -> Result<()> {
 591        response.send(proto::Ack {})?;
 592        Ok(())
 593    }
 594
 595    async fn create_room(
 596        self: Arc<Server>,
 597        request: TypedEnvelope<proto::CreateRoom>,
 598        response: Response<proto::CreateRoom>,
 599    ) -> Result<()> {
 600        let user_id;
 601        let room;
 602        {
 603            let mut store = self.store().await;
 604            user_id = store.user_id_for_connection(request.sender_id)?;
 605            room = store.create_room(request.sender_id)?.clone();
 606        }
 607
 608        let live_kit_token = if let Some(live_kit) = self.app_state.live_kit_client.as_ref() {
 609            if let Some(_) = live_kit
 610                .create_room(room.live_kit_room.clone())
 611                .await
 612                .with_context(|| {
 613                    format!(
 614                        "error creating LiveKit room (LiveKit room: {}, Zed room: {})",
 615                        room.live_kit_room, room.id
 616                    )
 617                })
 618                .trace_err()
 619            {
 620                live_kit
 621                    .room_token_for_user(&room.live_kit_room, &user_id.to_string())
 622                    .with_context(|| {
 623                        format!(
 624                            "error creating LiveKit access token (LiveKit room: {}, Zed room: {})",
 625                            room.live_kit_room, room.id
 626                        )
 627                    })
 628                    .trace_err()
 629            } else {
 630                None
 631            }
 632        } else {
 633            None
 634        };
 635
 636        response.send(proto::CreateRoomResponse {
 637            room: Some(room),
 638            live_kit_token,
 639        })?;
 640        self.update_user_contacts(user_id).await?;
 641        Ok(())
 642    }
 643
 644    async fn join_room(
 645        self: Arc<Server>,
 646        request: TypedEnvelope<proto::JoinRoom>,
 647        response: Response<proto::JoinRoom>,
 648    ) -> Result<()> {
 649        let user_id;
 650        {
 651            let mut store = self.store().await;
 652            user_id = store.user_id_for_connection(request.sender_id)?;
 653            let (room, recipient_connection_ids) =
 654                store.join_room(request.payload.id, request.sender_id)?;
 655            for recipient_id in recipient_connection_ids {
 656                self.peer
 657                    .send(recipient_id, proto::CallCanceled {})
 658                    .trace_err();
 659            }
 660
 661            let live_kit_token = if let Some(live_kit) = self.app_state.live_kit_client.as_ref() {
 662                live_kit
 663                    .room_token_for_user(&room.live_kit_room, &user_id.to_string())
 664                    .with_context(|| {
 665                        format!(
 666                            "error creating LiveKit access token (LiveKit room: {}, Zed room: {})",
 667                            room.live_kit_room, room.id
 668                        )
 669                    })
 670                    .trace_err()
 671            } else {
 672                None
 673            };
 674
 675            response.send(proto::JoinRoomResponse {
 676                room: Some(room.clone()),
 677                live_kit_token,
 678            })?;
 679            self.room_updated(room);
 680        }
 681        self.update_user_contacts(user_id).await?;
 682        Ok(())
 683    }
 684
 685    async fn leave_room(self: Arc<Server>, message: TypedEnvelope<proto::LeaveRoom>) -> Result<()> {
 686        let mut contacts_to_update = HashSet::default();
 687        let room_left;
 688        {
 689            let mut store = self.store().await;
 690            let user_id = store.user_id_for_connection(message.sender_id)?;
 691            let left_room = store.leave_room(message.payload.id, message.sender_id)?;
 692            contacts_to_update.insert(user_id);
 693
 694            for project in left_room.unshared_projects {
 695                for connection_id in project.connection_ids() {
 696                    self.peer.send(
 697                        connection_id,
 698                        proto::UnshareProject {
 699                            project_id: project.id.to_proto(),
 700                        },
 701                    )?;
 702                }
 703            }
 704
 705            for project in left_room.left_projects {
 706                if project.remove_collaborator {
 707                    for connection_id in project.connection_ids {
 708                        self.peer.send(
 709                            connection_id,
 710                            proto::RemoveProjectCollaborator {
 711                                project_id: project.id.to_proto(),
 712                                peer_id: message.sender_id.0,
 713                            },
 714                        )?;
 715                    }
 716
 717                    self.peer.send(
 718                        message.sender_id,
 719                        proto::UnshareProject {
 720                            project_id: project.id.to_proto(),
 721                        },
 722                    )?;
 723                }
 724            }
 725
 726            self.room_updated(&left_room.room);
 727            room_left = self.room_left(&left_room.room, user_id);
 728
 729            for connection_id in left_room.canceled_call_connection_ids {
 730                self.peer
 731                    .send(connection_id, proto::CallCanceled {})
 732                    .trace_err();
 733                contacts_to_update.extend(store.user_id_for_connection(connection_id).ok());
 734            }
 735        }
 736
 737        room_left.await.trace_err();
 738        for user_id in contacts_to_update {
 739            self.update_user_contacts(user_id).await?;
 740        }
 741
 742        Ok(())
 743    }
 744
 745    async fn call(
 746        self: Arc<Server>,
 747        request: TypedEnvelope<proto::Call>,
 748        response: Response<proto::Call>,
 749    ) -> Result<()> {
 750        let caller_user_id = self
 751            .store()
 752            .await
 753            .user_id_for_connection(request.sender_id)?;
 754        let recipient_user_id = UserId::from_proto(request.payload.recipient_user_id);
 755        let initial_project_id = request
 756            .payload
 757            .initial_project_id
 758            .map(ProjectId::from_proto);
 759        if !self
 760            .app_state
 761            .db
 762            .has_contact(caller_user_id, recipient_user_id)
 763            .await?
 764        {
 765            return Err(anyhow!("cannot call a user who isn't a contact"))?;
 766        }
 767
 768        let room_id = request.payload.room_id;
 769        let mut calls = {
 770            let mut store = self.store().await;
 771            let (room, recipient_connection_ids, incoming_call) = store.call(
 772                room_id,
 773                recipient_user_id,
 774                initial_project_id,
 775                request.sender_id,
 776            )?;
 777            self.room_updated(room);
 778            recipient_connection_ids
 779                .into_iter()
 780                .map(|recipient_connection_id| {
 781                    self.peer
 782                        .request(recipient_connection_id, incoming_call.clone())
 783                })
 784                .collect::<FuturesUnordered<_>>()
 785        };
 786        self.update_user_contacts(recipient_user_id).await?;
 787
 788        while let Some(call_response) = calls.next().await {
 789            match call_response.as_ref() {
 790                Ok(_) => {
 791                    response.send(proto::Ack {})?;
 792                    return Ok(());
 793                }
 794                Err(_) => {
 795                    call_response.trace_err();
 796                }
 797            }
 798        }
 799
 800        {
 801            let mut store = self.store().await;
 802            let room = store.call_failed(room_id, recipient_user_id)?;
 803            self.room_updated(&room);
 804        }
 805        self.update_user_contacts(recipient_user_id).await?;
 806
 807        Err(anyhow!("failed to ring call recipient"))?
 808    }
 809
 810    async fn cancel_call(
 811        self: Arc<Server>,
 812        request: TypedEnvelope<proto::CancelCall>,
 813        response: Response<proto::CancelCall>,
 814    ) -> Result<()> {
 815        let recipient_user_id = UserId::from_proto(request.payload.recipient_user_id);
 816        {
 817            let mut store = self.store().await;
 818            let (room, recipient_connection_ids) = store.cancel_call(
 819                request.payload.room_id,
 820                recipient_user_id,
 821                request.sender_id,
 822            )?;
 823            for recipient_id in recipient_connection_ids {
 824                self.peer
 825                    .send(recipient_id, proto::CallCanceled {})
 826                    .trace_err();
 827            }
 828            self.room_updated(room);
 829            response.send(proto::Ack {})?;
 830        }
 831        self.update_user_contacts(recipient_user_id).await?;
 832        Ok(())
 833    }
 834
 835    async fn decline_call(
 836        self: Arc<Server>,
 837        message: TypedEnvelope<proto::DeclineCall>,
 838    ) -> Result<()> {
 839        let recipient_user_id;
 840        {
 841            let mut store = self.store().await;
 842            recipient_user_id = store.user_id_for_connection(message.sender_id)?;
 843            let (room, recipient_connection_ids) =
 844                store.decline_call(message.payload.room_id, message.sender_id)?;
 845            for recipient_id in recipient_connection_ids {
 846                self.peer
 847                    .send(recipient_id, proto::CallCanceled {})
 848                    .trace_err();
 849            }
 850            self.room_updated(room);
 851        }
 852        self.update_user_contacts(recipient_user_id).await?;
 853        Ok(())
 854    }
 855
 856    async fn update_participant_location(
 857        self: Arc<Server>,
 858        request: TypedEnvelope<proto::UpdateParticipantLocation>,
 859        response: Response<proto::UpdateParticipantLocation>,
 860    ) -> Result<()> {
 861        let room_id = request.payload.room_id;
 862        let location = request
 863            .payload
 864            .location
 865            .ok_or_else(|| anyhow!("invalid location"))?;
 866        let mut store = self.store().await;
 867        let room = store.update_participant_location(room_id, location, request.sender_id)?;
 868        self.room_updated(room);
 869        response.send(proto::Ack {})?;
 870        Ok(())
 871    }
 872
 873    fn room_updated(&self, room: &proto::Room) {
 874        for participant in &room.participants {
 875            self.peer
 876                .send(
 877                    ConnectionId(participant.peer_id),
 878                    proto::RoomUpdated {
 879                        room: Some(room.clone()),
 880                    },
 881                )
 882                .trace_err();
 883        }
 884    }
 885
 886    fn room_left(&self, room: &proto::Room, user_id: UserId) -> impl Future<Output = Result<()>> {
 887        let client = self.app_state.live_kit_client.clone();
 888        let room_name = room.live_kit_room.clone();
 889        async move {
 890            if let Some(client) = client {
 891                client
 892                    .remove_participant(room_name, user_id.to_string())
 893                    .await?;
 894            }
 895
 896            Ok(())
 897        }
 898    }
 899
 900    async fn share_project(
 901        self: Arc<Server>,
 902        request: TypedEnvelope<proto::ShareProject>,
 903        response: Response<proto::ShareProject>,
 904    ) -> Result<()> {
 905        let user_id = self
 906            .store()
 907            .await
 908            .user_id_for_connection(request.sender_id)?;
 909        let project_id = self.app_state.db.register_project(user_id).await?;
 910        let mut store = self.store().await;
 911        let room = store.share_project(
 912            request.payload.room_id,
 913            project_id,
 914            request.payload.worktrees,
 915            request.sender_id,
 916        )?;
 917        response.send(proto::ShareProjectResponse {
 918            project_id: project_id.to_proto(),
 919        })?;
 920        self.room_updated(room);
 921
 922        Ok(())
 923    }
 924
 925    async fn unshare_project(
 926        self: Arc<Server>,
 927        message: TypedEnvelope<proto::UnshareProject>,
 928    ) -> Result<()> {
 929        let project_id = ProjectId::from_proto(message.payload.project_id);
 930        let mut store = self.store().await;
 931        let (room, project) = store.unshare_project(project_id, message.sender_id)?;
 932        broadcast(
 933            message.sender_id,
 934            project.guest_connection_ids(),
 935            |conn_id| self.peer.send(conn_id, message.payload.clone()),
 936        );
 937        self.room_updated(room);
 938
 939        Ok(())
 940    }
 941
 942    async fn update_user_contacts(self: &Arc<Server>, user_id: UserId) -> Result<()> {
 943        let contacts = self.app_state.db.get_contacts(user_id).await?;
 944        let store = self.store().await;
 945        let updated_contact = store.contact_for_user(user_id, false);
 946        for contact in contacts {
 947            if let db::Contact::Accepted {
 948                user_id: contact_user_id,
 949                ..
 950            } = contact
 951            {
 952                for contact_conn_id in store.connection_ids_for_user(contact_user_id) {
 953                    self.peer
 954                        .send(
 955                            contact_conn_id,
 956                            proto::UpdateContacts {
 957                                contacts: vec![updated_contact.clone()],
 958                                remove_contacts: Default::default(),
 959                                incoming_requests: Default::default(),
 960                                remove_incoming_requests: Default::default(),
 961                                outgoing_requests: Default::default(),
 962                                remove_outgoing_requests: Default::default(),
 963                            },
 964                        )
 965                        .trace_err();
 966                }
 967            }
 968        }
 969        Ok(())
 970    }
 971
 972    async fn join_project(
 973        self: Arc<Server>,
 974        request: TypedEnvelope<proto::JoinProject>,
 975        response: Response<proto::JoinProject>,
 976    ) -> Result<()> {
 977        let project_id = ProjectId::from_proto(request.payload.project_id);
 978
 979        let host_user_id;
 980        let guest_user_id;
 981        let host_connection_id;
 982        {
 983            let state = self.store().await;
 984            let project = state.project(project_id)?;
 985            host_user_id = project.host.user_id;
 986            host_connection_id = project.host_connection_id;
 987            guest_user_id = state.user_id_for_connection(request.sender_id)?;
 988        };
 989
 990        tracing::info!(%project_id, %host_user_id, %host_connection_id, "join project");
 991
 992        let mut store = self.store().await;
 993        let (project, replica_id) = store.join_project(request.sender_id, project_id)?;
 994        let peer_count = project.guests.len();
 995        let mut collaborators = Vec::with_capacity(peer_count);
 996        collaborators.push(proto::Collaborator {
 997            peer_id: project.host_connection_id.0,
 998            replica_id: 0,
 999            user_id: project.host.user_id.to_proto(),
1000        });
1001        let worktrees = project
1002            .worktrees
1003            .iter()
1004            .map(|(id, worktree)| proto::WorktreeMetadata {
1005                id: *id,
1006                root_name: worktree.root_name.clone(),
1007                visible: worktree.visible,
1008            })
1009            .collect::<Vec<_>>();
1010
1011        // Add all guests other than the requesting user's own connections as collaborators
1012        for (guest_conn_id, guest) in &project.guests {
1013            if request.sender_id != *guest_conn_id {
1014                collaborators.push(proto::Collaborator {
1015                    peer_id: guest_conn_id.0,
1016                    replica_id: guest.replica_id as u32,
1017                    user_id: guest.user_id.to_proto(),
1018                });
1019            }
1020        }
1021
1022        for conn_id in project.connection_ids() {
1023            if conn_id != request.sender_id {
1024                self.peer.send(
1025                    conn_id,
1026                    proto::AddProjectCollaborator {
1027                        project_id: project_id.to_proto(),
1028                        collaborator: Some(proto::Collaborator {
1029                            peer_id: request.sender_id.0,
1030                            replica_id: replica_id as u32,
1031                            user_id: guest_user_id.to_proto(),
1032                        }),
1033                    },
1034                )?;
1035            }
1036        }
1037
1038        // First, we send the metadata associated with each worktree.
1039        response.send(proto::JoinProjectResponse {
1040            worktrees: worktrees.clone(),
1041            replica_id: replica_id as u32,
1042            collaborators: collaborators.clone(),
1043            language_servers: project.language_servers.clone(),
1044        })?;
1045
1046        for (worktree_id, worktree) in &project.worktrees {
1047            #[cfg(any(test, feature = "test-support"))]
1048            const MAX_CHUNK_SIZE: usize = 2;
1049            #[cfg(not(any(test, feature = "test-support")))]
1050            const MAX_CHUNK_SIZE: usize = 256;
1051
1052            // Stream this worktree's entries.
1053            let message = proto::UpdateWorktree {
1054                project_id: project_id.to_proto(),
1055                worktree_id: *worktree_id,
1056                root_name: worktree.root_name.clone(),
1057                updated_entries: worktree.entries.values().cloned().collect(),
1058                removed_entries: Default::default(),
1059                scan_id: worktree.scan_id,
1060                is_last_update: worktree.is_complete,
1061            };
1062            for update in proto::split_worktree_update(message, MAX_CHUNK_SIZE) {
1063                self.peer.send(request.sender_id, update.clone())?;
1064            }
1065
1066            // Stream this worktree's diagnostics.
1067            for summary in worktree.diagnostic_summaries.values() {
1068                self.peer.send(
1069                    request.sender_id,
1070                    proto::UpdateDiagnosticSummary {
1071                        project_id: project_id.to_proto(),
1072                        worktree_id: *worktree_id,
1073                        summary: Some(summary.clone()),
1074                    },
1075                )?;
1076            }
1077        }
1078
1079        for language_server in &project.language_servers {
1080            self.peer.send(
1081                request.sender_id,
1082                proto::UpdateLanguageServer {
1083                    project_id: project_id.to_proto(),
1084                    language_server_id: language_server.id,
1085                    variant: Some(
1086                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
1087                            proto::LspDiskBasedDiagnosticsUpdated {},
1088                        ),
1089                    ),
1090                },
1091            )?;
1092        }
1093
1094        Ok(())
1095    }
1096
1097    async fn leave_project(
1098        self: Arc<Server>,
1099        request: TypedEnvelope<proto::LeaveProject>,
1100    ) -> Result<()> {
1101        let sender_id = request.sender_id;
1102        let project_id = ProjectId::from_proto(request.payload.project_id);
1103        let project;
1104        {
1105            let mut store = self.store().await;
1106            project = store.leave_project(project_id, sender_id)?;
1107            tracing::info!(
1108                %project_id,
1109                host_user_id = %project.host_user_id,
1110                host_connection_id = %project.host_connection_id,
1111                "leave project"
1112            );
1113
1114            if project.remove_collaborator {
1115                broadcast(sender_id, project.connection_ids, |conn_id| {
1116                    self.peer.send(
1117                        conn_id,
1118                        proto::RemoveProjectCollaborator {
1119                            project_id: project_id.to_proto(),
1120                            peer_id: sender_id.0,
1121                        },
1122                    )
1123                });
1124            }
1125        }
1126
1127        Ok(())
1128    }
1129
1130    async fn update_project(
1131        self: Arc<Server>,
1132        request: TypedEnvelope<proto::UpdateProject>,
1133    ) -> Result<()> {
1134        let project_id = ProjectId::from_proto(request.payload.project_id);
1135        {
1136            let mut state = self.store().await;
1137            let guest_connection_ids = state
1138                .read_project(project_id, request.sender_id)?
1139                .guest_connection_ids();
1140            let room =
1141                state.update_project(project_id, &request.payload.worktrees, request.sender_id)?;
1142            broadcast(request.sender_id, guest_connection_ids, |connection_id| {
1143                self.peer
1144                    .forward_send(request.sender_id, connection_id, request.payload.clone())
1145            });
1146            self.room_updated(room);
1147        };
1148
1149        Ok(())
1150    }
1151
1152    async fn register_project_activity(
1153        self: Arc<Server>,
1154        request: TypedEnvelope<proto::RegisterProjectActivity>,
1155    ) -> Result<()> {
1156        self.store().await.register_project_activity(
1157            ProjectId::from_proto(request.payload.project_id),
1158            request.sender_id,
1159        )?;
1160        Ok(())
1161    }
1162
1163    async fn update_worktree(
1164        self: Arc<Server>,
1165        request: TypedEnvelope<proto::UpdateWorktree>,
1166        response: Response<proto::UpdateWorktree>,
1167    ) -> Result<()> {
1168        let project_id = ProjectId::from_proto(request.payload.project_id);
1169        let worktree_id = request.payload.worktree_id;
1170        let connection_ids = self.store().await.update_worktree(
1171            request.sender_id,
1172            project_id,
1173            worktree_id,
1174            &request.payload.root_name,
1175            &request.payload.removed_entries,
1176            &request.payload.updated_entries,
1177            request.payload.scan_id,
1178            request.payload.is_last_update,
1179        )?;
1180
1181        broadcast(request.sender_id, connection_ids, |connection_id| {
1182            self.peer
1183                .forward_send(request.sender_id, connection_id, request.payload.clone())
1184        });
1185        response.send(proto::Ack {})?;
1186        Ok(())
1187    }
1188
1189    async fn update_worktree_extensions(
1190        self: Arc<Server>,
1191        request: TypedEnvelope<proto::UpdateWorktreeExtensions>,
1192    ) -> Result<()> {
1193        let project_id = ProjectId::from_proto(request.payload.project_id);
1194        let worktree_id = request.payload.worktree_id;
1195        let extensions = request
1196            .payload
1197            .extensions
1198            .into_iter()
1199            .zip(request.payload.counts)
1200            .collect();
1201        self.app_state
1202            .db
1203            .update_worktree_extensions(project_id, worktree_id, extensions)
1204            .await?;
1205        Ok(())
1206    }
1207
1208    async fn update_diagnostic_summary(
1209        self: Arc<Server>,
1210        request: TypedEnvelope<proto::UpdateDiagnosticSummary>,
1211    ) -> Result<()> {
1212        let summary = request
1213            .payload
1214            .summary
1215            .clone()
1216            .ok_or_else(|| anyhow!("invalid summary"))?;
1217        let receiver_ids = self.store().await.update_diagnostic_summary(
1218            ProjectId::from_proto(request.payload.project_id),
1219            request.payload.worktree_id,
1220            request.sender_id,
1221            summary,
1222        )?;
1223
1224        broadcast(request.sender_id, receiver_ids, |connection_id| {
1225            self.peer
1226                .forward_send(request.sender_id, connection_id, request.payload.clone())
1227        });
1228        Ok(())
1229    }
1230
1231    async fn start_language_server(
1232        self: Arc<Server>,
1233        request: TypedEnvelope<proto::StartLanguageServer>,
1234    ) -> Result<()> {
1235        let receiver_ids = self.store().await.start_language_server(
1236            ProjectId::from_proto(request.payload.project_id),
1237            request.sender_id,
1238            request
1239                .payload
1240                .server
1241                .clone()
1242                .ok_or_else(|| anyhow!("invalid language server"))?,
1243        )?;
1244        broadcast(request.sender_id, receiver_ids, |connection_id| {
1245            self.peer
1246                .forward_send(request.sender_id, connection_id, request.payload.clone())
1247        });
1248        Ok(())
1249    }
1250
1251    async fn update_language_server(
1252        self: Arc<Server>,
1253        request: TypedEnvelope<proto::UpdateLanguageServer>,
1254    ) -> Result<()> {
1255        let receiver_ids = self.store().await.project_connection_ids(
1256            ProjectId::from_proto(request.payload.project_id),
1257            request.sender_id,
1258        )?;
1259        broadcast(request.sender_id, receiver_ids, |connection_id| {
1260            self.peer
1261                .forward_send(request.sender_id, connection_id, request.payload.clone())
1262        });
1263        Ok(())
1264    }
1265
1266    async fn forward_project_request<T>(
1267        self: Arc<Server>,
1268        request: TypedEnvelope<T>,
1269        response: Response<T>,
1270    ) -> Result<()>
1271    where
1272        T: EntityMessage + RequestMessage,
1273    {
1274        let project_id = ProjectId::from_proto(request.payload.remote_entity_id());
1275        let host_connection_id = self
1276            .store()
1277            .await
1278            .read_project(project_id, request.sender_id)?
1279            .host_connection_id;
1280        let payload = self
1281            .peer
1282            .forward_request(request.sender_id, host_connection_id, request.payload)
1283            .await?;
1284
1285        // Ensure project still exists by the time we get the response from the host.
1286        self.store()
1287            .await
1288            .read_project(project_id, request.sender_id)?;
1289
1290        response.send(payload)?;
1291        Ok(())
1292    }
1293
1294    async fn save_buffer(
1295        self: Arc<Server>,
1296        request: TypedEnvelope<proto::SaveBuffer>,
1297        response: Response<proto::SaveBuffer>,
1298    ) -> Result<()> {
1299        let project_id = ProjectId::from_proto(request.payload.project_id);
1300        let host = self
1301            .store()
1302            .await
1303            .read_project(project_id, request.sender_id)?
1304            .host_connection_id;
1305        let response_payload = self
1306            .peer
1307            .forward_request(request.sender_id, host, request.payload.clone())
1308            .await?;
1309
1310        let mut guests = self
1311            .store()
1312            .await
1313            .read_project(project_id, request.sender_id)?
1314            .connection_ids();
1315        guests.retain(|guest_connection_id| *guest_connection_id != request.sender_id);
1316        broadcast(host, guests, |conn_id| {
1317            self.peer
1318                .forward_send(host, conn_id, response_payload.clone())
1319        });
1320        response.send(response_payload)?;
1321        Ok(())
1322    }
1323
1324    async fn create_buffer_for_peer(
1325        self: Arc<Server>,
1326        request: TypedEnvelope<proto::CreateBufferForPeer>,
1327    ) -> Result<()> {
1328        self.peer.forward_send(
1329            request.sender_id,
1330            ConnectionId(request.payload.peer_id),
1331            request.payload,
1332        )?;
1333        Ok(())
1334    }
1335
1336    async fn update_buffer(
1337        self: Arc<Server>,
1338        request: TypedEnvelope<proto::UpdateBuffer>,
1339        response: Response<proto::UpdateBuffer>,
1340    ) -> Result<()> {
1341        let project_id = ProjectId::from_proto(request.payload.project_id);
1342        let receiver_ids = {
1343            let mut store = self.store().await;
1344            store.register_project_activity(project_id, request.sender_id)?;
1345            store.project_connection_ids(project_id, request.sender_id)?
1346        };
1347
1348        broadcast(request.sender_id, receiver_ids, |connection_id| {
1349            self.peer
1350                .forward_send(request.sender_id, connection_id, request.payload.clone())
1351        });
1352        response.send(proto::Ack {})?;
1353        Ok(())
1354    }
1355
1356    async fn update_buffer_file(
1357        self: Arc<Server>,
1358        request: TypedEnvelope<proto::UpdateBufferFile>,
1359    ) -> Result<()> {
1360        let receiver_ids = self.store().await.project_connection_ids(
1361            ProjectId::from_proto(request.payload.project_id),
1362            request.sender_id,
1363        )?;
1364        broadcast(request.sender_id, receiver_ids, |connection_id| {
1365            self.peer
1366                .forward_send(request.sender_id, connection_id, request.payload.clone())
1367        });
1368        Ok(())
1369    }
1370
1371    async fn buffer_reloaded(
1372        self: Arc<Server>,
1373        request: TypedEnvelope<proto::BufferReloaded>,
1374    ) -> Result<()> {
1375        let receiver_ids = self.store().await.project_connection_ids(
1376            ProjectId::from_proto(request.payload.project_id),
1377            request.sender_id,
1378        )?;
1379        broadcast(request.sender_id, receiver_ids, |connection_id| {
1380            self.peer
1381                .forward_send(request.sender_id, connection_id, request.payload.clone())
1382        });
1383        Ok(())
1384    }
1385
1386    async fn buffer_saved(
1387        self: Arc<Server>,
1388        request: TypedEnvelope<proto::BufferSaved>,
1389    ) -> Result<()> {
1390        let receiver_ids = self.store().await.project_connection_ids(
1391            ProjectId::from_proto(request.payload.project_id),
1392            request.sender_id,
1393        )?;
1394        broadcast(request.sender_id, receiver_ids, |connection_id| {
1395            self.peer
1396                .forward_send(request.sender_id, connection_id, request.payload.clone())
1397        });
1398        Ok(())
1399    }
1400
1401    async fn follow(
1402        self: Arc<Self>,
1403        request: TypedEnvelope<proto::Follow>,
1404        response: Response<proto::Follow>,
1405    ) -> Result<()> {
1406        let project_id = ProjectId::from_proto(request.payload.project_id);
1407        let leader_id = ConnectionId(request.payload.leader_id);
1408        let follower_id = request.sender_id;
1409        {
1410            let mut store = self.store().await;
1411            if !store
1412                .project_connection_ids(project_id, follower_id)?
1413                .contains(&leader_id)
1414            {
1415                Err(anyhow!("no such peer"))?;
1416            }
1417
1418            store.register_project_activity(project_id, follower_id)?;
1419        }
1420
1421        let mut response_payload = self
1422            .peer
1423            .forward_request(request.sender_id, leader_id, request.payload)
1424            .await?;
1425        response_payload
1426            .views
1427            .retain(|view| view.leader_id != Some(follower_id.0));
1428        response.send(response_payload)?;
1429        Ok(())
1430    }
1431
1432    async fn unfollow(self: Arc<Self>, request: TypedEnvelope<proto::Unfollow>) -> Result<()> {
1433        let project_id = ProjectId::from_proto(request.payload.project_id);
1434        let leader_id = ConnectionId(request.payload.leader_id);
1435        let mut store = self.store().await;
1436        if !store
1437            .project_connection_ids(project_id, request.sender_id)?
1438            .contains(&leader_id)
1439        {
1440            Err(anyhow!("no such peer"))?;
1441        }
1442        store.register_project_activity(project_id, request.sender_id)?;
1443        self.peer
1444            .forward_send(request.sender_id, leader_id, request.payload)?;
1445        Ok(())
1446    }
1447
1448    async fn update_followers(
1449        self: Arc<Self>,
1450        request: TypedEnvelope<proto::UpdateFollowers>,
1451    ) -> Result<()> {
1452        let project_id = ProjectId::from_proto(request.payload.project_id);
1453        let mut store = self.store().await;
1454        store.register_project_activity(project_id, request.sender_id)?;
1455        let connection_ids = store.project_connection_ids(project_id, request.sender_id)?;
1456        let leader_id = request
1457            .payload
1458            .variant
1459            .as_ref()
1460            .and_then(|variant| match variant {
1461                proto::update_followers::Variant::CreateView(payload) => payload.leader_id,
1462                proto::update_followers::Variant::UpdateView(payload) => payload.leader_id,
1463                proto::update_followers::Variant::UpdateActiveView(payload) => payload.leader_id,
1464            });
1465        for follower_id in &request.payload.follower_ids {
1466            let follower_id = ConnectionId(*follower_id);
1467            if connection_ids.contains(&follower_id) && Some(follower_id.0) != leader_id {
1468                self.peer
1469                    .forward_send(request.sender_id, follower_id, request.payload.clone())?;
1470            }
1471        }
1472        Ok(())
1473    }
1474
1475    async fn get_channels(
1476        self: Arc<Server>,
1477        request: TypedEnvelope<proto::GetChannels>,
1478        response: Response<proto::GetChannels>,
1479    ) -> Result<()> {
1480        let user_id = self
1481            .store()
1482            .await
1483            .user_id_for_connection(request.sender_id)?;
1484        let channels = self.app_state.db.get_accessible_channels(user_id).await?;
1485        response.send(proto::GetChannelsResponse {
1486            channels: channels
1487                .into_iter()
1488                .map(|chan| proto::Channel {
1489                    id: chan.id.to_proto(),
1490                    name: chan.name,
1491                })
1492                .collect(),
1493        })?;
1494        Ok(())
1495    }
1496
1497    async fn get_users(
1498        self: Arc<Server>,
1499        request: TypedEnvelope<proto::GetUsers>,
1500        response: Response<proto::GetUsers>,
1501    ) -> Result<()> {
1502        let user_ids = request
1503            .payload
1504            .user_ids
1505            .into_iter()
1506            .map(UserId::from_proto)
1507            .collect();
1508        let users = self
1509            .app_state
1510            .db
1511            .get_users_by_ids(user_ids)
1512            .await?
1513            .into_iter()
1514            .map(|user| proto::User {
1515                id: user.id.to_proto(),
1516                avatar_url: format!("https://github.com/{}.png?size=128", user.github_login),
1517                github_login: user.github_login,
1518            })
1519            .collect();
1520        response.send(proto::UsersResponse { users })?;
1521        Ok(())
1522    }
1523
1524    async fn fuzzy_search_users(
1525        self: Arc<Server>,
1526        request: TypedEnvelope<proto::FuzzySearchUsers>,
1527        response: Response<proto::FuzzySearchUsers>,
1528    ) -> Result<()> {
1529        let user_id = self
1530            .store()
1531            .await
1532            .user_id_for_connection(request.sender_id)?;
1533        let query = request.payload.query;
1534        let db = &self.app_state.db;
1535        let users = match query.len() {
1536            0 => vec![],
1537            1 | 2 => db
1538                .get_user_by_github_account(&query, None)
1539                .await?
1540                .into_iter()
1541                .collect(),
1542            _ => db.fuzzy_search_users(&query, 10).await?,
1543        };
1544        let users = users
1545            .into_iter()
1546            .filter(|user| user.id != user_id)
1547            .map(|user| proto::User {
1548                id: user.id.to_proto(),
1549                avatar_url: format!("https://github.com/{}.png?size=128", user.github_login),
1550                github_login: user.github_login,
1551            })
1552            .collect();
1553        response.send(proto::UsersResponse { users })?;
1554        Ok(())
1555    }
1556
1557    async fn request_contact(
1558        self: Arc<Server>,
1559        request: TypedEnvelope<proto::RequestContact>,
1560        response: Response<proto::RequestContact>,
1561    ) -> Result<()> {
1562        let requester_id = self
1563            .store()
1564            .await
1565            .user_id_for_connection(request.sender_id)?;
1566        let responder_id = UserId::from_proto(request.payload.responder_id);
1567        if requester_id == responder_id {
1568            return Err(anyhow!("cannot add yourself as a contact"))?;
1569        }
1570
1571        self.app_state
1572            .db
1573            .send_contact_request(requester_id, responder_id)
1574            .await?;
1575
1576        // Update outgoing contact requests of requester
1577        let mut update = proto::UpdateContacts::default();
1578        update.outgoing_requests.push(responder_id.to_proto());
1579        for connection_id in self.store().await.connection_ids_for_user(requester_id) {
1580            self.peer.send(connection_id, update.clone())?;
1581        }
1582
1583        // Update incoming contact requests of responder
1584        let mut update = proto::UpdateContacts::default();
1585        update
1586            .incoming_requests
1587            .push(proto::IncomingContactRequest {
1588                requester_id: requester_id.to_proto(),
1589                should_notify: true,
1590            });
1591        for connection_id in self.store().await.connection_ids_for_user(responder_id) {
1592            self.peer.send(connection_id, update.clone())?;
1593        }
1594
1595        response.send(proto::Ack {})?;
1596        Ok(())
1597    }
1598
1599    async fn respond_to_contact_request(
1600        self: Arc<Server>,
1601        request: TypedEnvelope<proto::RespondToContactRequest>,
1602        response: Response<proto::RespondToContactRequest>,
1603    ) -> Result<()> {
1604        let responder_id = self
1605            .store()
1606            .await
1607            .user_id_for_connection(request.sender_id)?;
1608        let requester_id = UserId::from_proto(request.payload.requester_id);
1609        if request.payload.response == proto::ContactRequestResponse::Dismiss as i32 {
1610            self.app_state
1611                .db
1612                .dismiss_contact_notification(responder_id, requester_id)
1613                .await?;
1614        } else {
1615            let accept = request.payload.response == proto::ContactRequestResponse::Accept as i32;
1616            self.app_state
1617                .db
1618                .respond_to_contact_request(responder_id, requester_id, accept)
1619                .await?;
1620
1621            let store = self.store().await;
1622            // Update responder with new contact
1623            let mut update = proto::UpdateContacts::default();
1624            if accept {
1625                update
1626                    .contacts
1627                    .push(store.contact_for_user(requester_id, false));
1628            }
1629            update
1630                .remove_incoming_requests
1631                .push(requester_id.to_proto());
1632            for connection_id in store.connection_ids_for_user(responder_id) {
1633                self.peer.send(connection_id, update.clone())?;
1634            }
1635
1636            // Update requester with new contact
1637            let mut update = proto::UpdateContacts::default();
1638            if accept {
1639                update
1640                    .contacts
1641                    .push(store.contact_for_user(responder_id, true));
1642            }
1643            update
1644                .remove_outgoing_requests
1645                .push(responder_id.to_proto());
1646            for connection_id in store.connection_ids_for_user(requester_id) {
1647                self.peer.send(connection_id, update.clone())?;
1648            }
1649        }
1650
1651        response.send(proto::Ack {})?;
1652        Ok(())
1653    }
1654
1655    async fn remove_contact(
1656        self: Arc<Server>,
1657        request: TypedEnvelope<proto::RemoveContact>,
1658        response: Response<proto::RemoveContact>,
1659    ) -> Result<()> {
1660        let requester_id = self
1661            .store()
1662            .await
1663            .user_id_for_connection(request.sender_id)?;
1664        let responder_id = UserId::from_proto(request.payload.user_id);
1665        self.app_state
1666            .db
1667            .remove_contact(requester_id, responder_id)
1668            .await?;
1669
1670        // Update outgoing contact requests of requester
1671        let mut update = proto::UpdateContacts::default();
1672        update
1673            .remove_outgoing_requests
1674            .push(responder_id.to_proto());
1675        for connection_id in self.store().await.connection_ids_for_user(requester_id) {
1676            self.peer.send(connection_id, update.clone())?;
1677        }
1678
1679        // Update incoming contact requests of responder
1680        let mut update = proto::UpdateContacts::default();
1681        update
1682            .remove_incoming_requests
1683            .push(requester_id.to_proto());
1684        for connection_id in self.store().await.connection_ids_for_user(responder_id) {
1685            self.peer.send(connection_id, update.clone())?;
1686        }
1687
1688        response.send(proto::Ack {})?;
1689        Ok(())
1690    }
1691
1692    async fn join_channel(
1693        self: Arc<Self>,
1694        request: TypedEnvelope<proto::JoinChannel>,
1695        response: Response<proto::JoinChannel>,
1696    ) -> Result<()> {
1697        let user_id = self
1698            .store()
1699            .await
1700            .user_id_for_connection(request.sender_id)?;
1701        let channel_id = ChannelId::from_proto(request.payload.channel_id);
1702        if !self
1703            .app_state
1704            .db
1705            .can_user_access_channel(user_id, channel_id)
1706            .await?
1707        {
1708            Err(anyhow!("access denied"))?;
1709        }
1710
1711        self.store()
1712            .await
1713            .join_channel(request.sender_id, channel_id);
1714        let messages = self
1715            .app_state
1716            .db
1717            .get_channel_messages(channel_id, MESSAGE_COUNT_PER_PAGE, None)
1718            .await?
1719            .into_iter()
1720            .map(|msg| proto::ChannelMessage {
1721                id: msg.id.to_proto(),
1722                body: msg.body,
1723                timestamp: msg.sent_at.unix_timestamp() as u64,
1724                sender_id: msg.sender_id.to_proto(),
1725                nonce: Some(msg.nonce.as_u128().into()),
1726            })
1727            .collect::<Vec<_>>();
1728        response.send(proto::JoinChannelResponse {
1729            done: messages.len() < MESSAGE_COUNT_PER_PAGE,
1730            messages,
1731        })?;
1732        Ok(())
1733    }
1734
1735    async fn leave_channel(
1736        self: Arc<Self>,
1737        request: TypedEnvelope<proto::LeaveChannel>,
1738    ) -> Result<()> {
1739        let user_id = self
1740            .store()
1741            .await
1742            .user_id_for_connection(request.sender_id)?;
1743        let channel_id = ChannelId::from_proto(request.payload.channel_id);
1744        if !self
1745            .app_state
1746            .db
1747            .can_user_access_channel(user_id, channel_id)
1748            .await?
1749        {
1750            Err(anyhow!("access denied"))?;
1751        }
1752
1753        self.store()
1754            .await
1755            .leave_channel(request.sender_id, channel_id);
1756
1757        Ok(())
1758    }
1759
1760    async fn send_channel_message(
1761        self: Arc<Self>,
1762        request: TypedEnvelope<proto::SendChannelMessage>,
1763        response: Response<proto::SendChannelMessage>,
1764    ) -> Result<()> {
1765        let channel_id = ChannelId::from_proto(request.payload.channel_id);
1766        let user_id;
1767        let connection_ids;
1768        {
1769            let state = self.store().await;
1770            user_id = state.user_id_for_connection(request.sender_id)?;
1771            connection_ids = state.channel_connection_ids(channel_id)?;
1772        }
1773
1774        // Validate the message body.
1775        let body = request.payload.body.trim().to_string();
1776        if body.len() > MAX_MESSAGE_LEN {
1777            return Err(anyhow!("message is too long"))?;
1778        }
1779        if body.is_empty() {
1780            return Err(anyhow!("message can't be blank"))?;
1781        }
1782
1783        let timestamp = OffsetDateTime::now_utc();
1784        let nonce = request
1785            .payload
1786            .nonce
1787            .ok_or_else(|| anyhow!("nonce can't be blank"))?;
1788
1789        let message_id = self
1790            .app_state
1791            .db
1792            .create_channel_message(channel_id, user_id, &body, timestamp, nonce.clone().into())
1793            .await?
1794            .to_proto();
1795        let message = proto::ChannelMessage {
1796            sender_id: user_id.to_proto(),
1797            id: message_id,
1798            body,
1799            timestamp: timestamp.unix_timestamp() as u64,
1800            nonce: Some(nonce),
1801        };
1802        broadcast(request.sender_id, connection_ids, |conn_id| {
1803            self.peer.send(
1804                conn_id,
1805                proto::ChannelMessageSent {
1806                    channel_id: channel_id.to_proto(),
1807                    message: Some(message.clone()),
1808                },
1809            )
1810        });
1811        response.send(proto::SendChannelMessageResponse {
1812            message: Some(message),
1813        })?;
1814        Ok(())
1815    }
1816
1817    async fn get_channel_messages(
1818        self: Arc<Self>,
1819        request: TypedEnvelope<proto::GetChannelMessages>,
1820        response: Response<proto::GetChannelMessages>,
1821    ) -> Result<()> {
1822        let user_id = self
1823            .store()
1824            .await
1825            .user_id_for_connection(request.sender_id)?;
1826        let channel_id = ChannelId::from_proto(request.payload.channel_id);
1827        if !self
1828            .app_state
1829            .db
1830            .can_user_access_channel(user_id, channel_id)
1831            .await?
1832        {
1833            Err(anyhow!("access denied"))?;
1834        }
1835
1836        let messages = self
1837            .app_state
1838            .db
1839            .get_channel_messages(
1840                channel_id,
1841                MESSAGE_COUNT_PER_PAGE,
1842                Some(MessageId::from_proto(request.payload.before_message_id)),
1843            )
1844            .await?
1845            .into_iter()
1846            .map(|msg| proto::ChannelMessage {
1847                id: msg.id.to_proto(),
1848                body: msg.body,
1849                timestamp: msg.sent_at.unix_timestamp() as u64,
1850                sender_id: msg.sender_id.to_proto(),
1851                nonce: Some(msg.nonce.as_u128().into()),
1852            })
1853            .collect::<Vec<_>>();
1854        response.send(proto::GetChannelMessagesResponse {
1855            done: messages.len() < MESSAGE_COUNT_PER_PAGE,
1856            messages,
1857        })?;
1858        Ok(())
1859    }
1860
1861    async fn update_diff_base(
1862        self: Arc<Server>,
1863        request: TypedEnvelope<proto::UpdateDiffBase>,
1864    ) -> Result<()> {
1865        let receiver_ids = self.store().await.project_connection_ids(
1866            ProjectId::from_proto(request.payload.project_id),
1867            request.sender_id,
1868        )?;
1869        broadcast(request.sender_id, receiver_ids, |connection_id| {
1870            self.peer
1871                .forward_send(request.sender_id, connection_id, request.payload.clone())
1872        });
1873        Ok(())
1874    }
1875
1876    async fn get_private_user_info(
1877        self: Arc<Self>,
1878        request: TypedEnvelope<proto::GetPrivateUserInfo>,
1879        response: Response<proto::GetPrivateUserInfo>,
1880    ) -> Result<()> {
1881        let user_id = self
1882            .store()
1883            .await
1884            .user_id_for_connection(request.sender_id)?;
1885        let metrics_id = self.app_state.db.get_user_metrics_id(user_id).await?;
1886        let user = self
1887            .app_state
1888            .db
1889            .get_user_by_id(user_id)
1890            .await?
1891            .ok_or_else(|| anyhow!("user not found"))?;
1892        response.send(proto::GetPrivateUserInfoResponse {
1893            metrics_id,
1894            staff: user.admin,
1895        })?;
1896        Ok(())
1897    }
1898
1899    pub(crate) async fn store(&self) -> StoreGuard<'_> {
1900        #[cfg(test)]
1901        tokio::task::yield_now().await;
1902        let guard = self.store.lock().await;
1903        #[cfg(test)]
1904        tokio::task::yield_now().await;
1905        StoreGuard {
1906            guard,
1907            _not_send: PhantomData,
1908        }
1909    }
1910
1911    pub async fn snapshot<'a>(self: &'a Arc<Self>) -> ServerSnapshot<'a> {
1912        ServerSnapshot {
1913            store: self.store().await,
1914            peer: &self.peer,
1915        }
1916    }
1917}
1918
1919impl<'a> Deref for StoreGuard<'a> {
1920    type Target = Store;
1921
1922    fn deref(&self) -> &Self::Target {
1923        &*self.guard
1924    }
1925}
1926
1927impl<'a> DerefMut for StoreGuard<'a> {
1928    fn deref_mut(&mut self) -> &mut Self::Target {
1929        &mut *self.guard
1930    }
1931}
1932
1933impl<'a> Drop for StoreGuard<'a> {
1934    fn drop(&mut self) {
1935        #[cfg(test)]
1936        self.check_invariants();
1937    }
1938}
1939
1940impl Executor for RealExecutor {
1941    type Sleep = Sleep;
1942
1943    fn spawn_detached<F: 'static + Send + Future<Output = ()>>(&self, future: F) {
1944        tokio::task::spawn(future);
1945    }
1946
1947    fn sleep(&self, duration: Duration) -> Self::Sleep {
1948        tokio::time::sleep(duration)
1949    }
1950}
1951
1952fn broadcast<F>(
1953    sender_id: ConnectionId,
1954    receiver_ids: impl IntoIterator<Item = ConnectionId>,
1955    mut f: F,
1956) where
1957    F: FnMut(ConnectionId) -> anyhow::Result<()>,
1958{
1959    for receiver_id in receiver_ids {
1960        if receiver_id != sender_id {
1961            f(receiver_id).trace_err();
1962        }
1963    }
1964}
1965
1966lazy_static! {
1967    static ref ZED_PROTOCOL_VERSION: HeaderName = HeaderName::from_static("x-zed-protocol-version");
1968}
1969
1970pub struct ProtocolVersion(u32);
1971
1972impl Header for ProtocolVersion {
1973    fn name() -> &'static HeaderName {
1974        &ZED_PROTOCOL_VERSION
1975    }
1976
1977    fn decode<'i, I>(values: &mut I) -> Result<Self, axum::headers::Error>
1978    where
1979        Self: Sized,
1980        I: Iterator<Item = &'i axum::http::HeaderValue>,
1981    {
1982        let version = values
1983            .next()
1984            .ok_or_else(axum::headers::Error::invalid)?
1985            .to_str()
1986            .map_err(|_| axum::headers::Error::invalid())?
1987            .parse()
1988            .map_err(|_| axum::headers::Error::invalid())?;
1989        Ok(Self(version))
1990    }
1991
1992    fn encode<E: Extend<axum::http::HeaderValue>>(&self, values: &mut E) {
1993        values.extend([self.0.to_string().parse().unwrap()]);
1994    }
1995}
1996
1997pub fn routes(server: Arc<Server>) -> Router<Body> {
1998    Router::new()
1999        .route("/rpc", get(handle_websocket_request))
2000        .layer(
2001            ServiceBuilder::new()
2002                .layer(Extension(server.app_state.clone()))
2003                .layer(middleware::from_fn(auth::validate_header)),
2004        )
2005        .route("/metrics", get(handle_metrics))
2006        .layer(Extension(server))
2007}
2008
2009pub async fn handle_websocket_request(
2010    TypedHeader(ProtocolVersion(protocol_version)): TypedHeader<ProtocolVersion>,
2011    ConnectInfo(socket_address): ConnectInfo<SocketAddr>,
2012    Extension(server): Extension<Arc<Server>>,
2013    Extension(user): Extension<User>,
2014    ws: WebSocketUpgrade,
2015) -> axum::response::Response {
2016    if protocol_version != rpc::PROTOCOL_VERSION {
2017        return (
2018            StatusCode::UPGRADE_REQUIRED,
2019            "client must be upgraded".to_string(),
2020        )
2021            .into_response();
2022    }
2023    let socket_address = socket_address.to_string();
2024    ws.on_upgrade(move |socket| {
2025        use util::ResultExt;
2026        let socket = socket
2027            .map_ok(to_tungstenite_message)
2028            .err_into()
2029            .with(|message| async move { Ok(to_axum_message(message)) });
2030        let connection = Connection::new(Box::pin(socket));
2031        async move {
2032            server
2033                .handle_connection(connection, socket_address, user, None, RealExecutor)
2034                .await
2035                .log_err();
2036        }
2037    })
2038}
2039
2040pub async fn handle_metrics(Extension(server): Extension<Arc<Server>>) -> axum::response::Response {
2041    // We call `store_mut` here for its side effects of updating metrics.
2042    let metrics = server.store().await.metrics();
2043    METRIC_CONNECTIONS.set(metrics.connections as _);
2044    METRIC_REGISTERED_PROJECTS.set(metrics.registered_projects as _);
2045    METRIC_ACTIVE_PROJECTS.set(metrics.active_projects as _);
2046    METRIC_SHARED_PROJECTS.set(metrics.shared_projects as _);
2047
2048    let encoder = prometheus::TextEncoder::new();
2049    let metric_families = prometheus::gather();
2050    match encoder.encode_to_string(&metric_families) {
2051        Ok(string) => (StatusCode::OK, string).into_response(),
2052        Err(error) => (
2053            StatusCode::INTERNAL_SERVER_ERROR,
2054            format!("failed to encode metrics {:?}", error),
2055        )
2056            .into_response(),
2057    }
2058}
2059
2060fn to_axum_message(message: TungsteniteMessage) -> AxumMessage {
2061    match message {
2062        TungsteniteMessage::Text(payload) => AxumMessage::Text(payload),
2063        TungsteniteMessage::Binary(payload) => AxumMessage::Binary(payload),
2064        TungsteniteMessage::Ping(payload) => AxumMessage::Ping(payload),
2065        TungsteniteMessage::Pong(payload) => AxumMessage::Pong(payload),
2066        TungsteniteMessage::Close(frame) => AxumMessage::Close(frame.map(|frame| AxumCloseFrame {
2067            code: frame.code.into(),
2068            reason: frame.reason,
2069        })),
2070    }
2071}
2072
2073fn to_tungstenite_message(message: AxumMessage) -> TungsteniteMessage {
2074    match message {
2075        AxumMessage::Text(payload) => TungsteniteMessage::Text(payload),
2076        AxumMessage::Binary(payload) => TungsteniteMessage::Binary(payload),
2077        AxumMessage::Ping(payload) => TungsteniteMessage::Ping(payload),
2078        AxumMessage::Pong(payload) => TungsteniteMessage::Pong(payload),
2079        AxumMessage::Close(frame) => {
2080            TungsteniteMessage::Close(frame.map(|frame| TungsteniteCloseFrame {
2081                code: frame.code.into(),
2082                reason: frame.reason,
2083            }))
2084        }
2085    }
2086}
2087
2088pub trait ResultExt {
2089    type Ok;
2090
2091    fn trace_err(self) -> Option<Self::Ok>;
2092}
2093
2094impl<T, E> ResultExt for Result<T, E>
2095where
2096    E: std::fmt::Debug,
2097{
2098    type Ok = T;
2099
2100    fn trace_err(self) -> Option<T> {
2101        match self {
2102            Ok(value) => Some(value),
2103            Err(error) => {
2104                tracing::error!("{:?}", error);
2105                None
2106            }
2107        }
2108    }
2109}