1mod store;
   2
   3use crate::{
   4    auth,
   5    db::{self, ChannelId, MessageId, ProjectId, User, UserId},
   6    AppState, Result,
   7};
   8use anyhow::anyhow;
   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, connection_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_connection_info =
 609            if let Some(live_kit) = self.app_state.live_kit_client.as_ref() {
 610                if let Some(_) = live_kit
 611                    .create_room(room.live_kit_room.clone())
 612                    .await
 613                    .trace_err()
 614                {
 615                    if let Some(token) = live_kit
 616                        .room_token(&room.live_kit_room, &request.sender_id.to_string())
 617                        .trace_err()
 618                    {
 619                        Some(proto::LiveKitConnectionInfo {
 620                            server_url: live_kit.url().into(),
 621                            token,
 622                        })
 623                    } else {
 624                        None
 625                    }
 626                } else {
 627                    None
 628                }
 629            } else {
 630                None
 631            };
 632
 633        response.send(proto::CreateRoomResponse {
 634            room: Some(room),
 635            live_kit_connection_info,
 636        })?;
 637        self.update_user_contacts(user_id).await?;
 638        Ok(())
 639    }
 640
 641    async fn join_room(
 642        self: Arc<Server>,
 643        request: TypedEnvelope<proto::JoinRoom>,
 644        response: Response<proto::JoinRoom>,
 645    ) -> Result<()> {
 646        let user_id;
 647        {
 648            let mut store = self.store().await;
 649            user_id = store.user_id_for_connection(request.sender_id)?;
 650            let (room, recipient_connection_ids) =
 651                store.join_room(request.payload.id, request.sender_id)?;
 652            for recipient_id in recipient_connection_ids {
 653                self.peer
 654                    .send(recipient_id, proto::CallCanceled {})
 655                    .trace_err();
 656            }
 657
 658            let live_kit_connection_info =
 659                if let Some(live_kit) = self.app_state.live_kit_client.as_ref() {
 660                    if let Some(token) = live_kit
 661                        .room_token(&room.live_kit_room, &request.sender_id.to_string())
 662                        .trace_err()
 663                    {
 664                        Some(proto::LiveKitConnectionInfo {
 665                            server_url: live_kit.url().into(),
 666                            token,
 667                        })
 668                    } else {
 669                        None
 670                    }
 671                } else {
 672                    None
 673                };
 674
 675            response.send(proto::JoinRoomResponse {
 676                room: Some(room.clone()),
 677                live_kit_connection_info,
 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, message.sender_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(
 887        &self,
 888        room: &proto::Room,
 889        connection_id: ConnectionId,
 890    ) -> impl Future<Output = Result<()>> {
 891        let client = self.app_state.live_kit_client.clone();
 892        let room_name = room.live_kit_room.clone();
 893        async move {
 894            if let Some(client) = client {
 895                client
 896                    .remove_participant(room_name, connection_id.to_string())
 897                    .await?;
 898            }
 899
 900            Ok(())
 901        }
 902    }
 903
 904    async fn share_project(
 905        self: Arc<Server>,
 906        request: TypedEnvelope<proto::ShareProject>,
 907        response: Response<proto::ShareProject>,
 908    ) -> Result<()> {
 909        let user_id = self
 910            .store()
 911            .await
 912            .user_id_for_connection(request.sender_id)?;
 913        let project_id = self.app_state.db.register_project(user_id).await?;
 914        let mut store = self.store().await;
 915        let room = store.share_project(
 916            request.payload.room_id,
 917            project_id,
 918            request.payload.worktrees,
 919            request.sender_id,
 920        )?;
 921        response.send(proto::ShareProjectResponse {
 922            project_id: project_id.to_proto(),
 923        })?;
 924        self.room_updated(room);
 925
 926        Ok(())
 927    }
 928
 929    async fn unshare_project(
 930        self: Arc<Server>,
 931        message: TypedEnvelope<proto::UnshareProject>,
 932    ) -> Result<()> {
 933        let project_id = ProjectId::from_proto(message.payload.project_id);
 934        let mut store = self.store().await;
 935        let (room, project) = store.unshare_project(project_id, message.sender_id)?;
 936        broadcast(
 937            message.sender_id,
 938            project.guest_connection_ids(),
 939            |conn_id| self.peer.send(conn_id, message.payload.clone()),
 940        );
 941        self.room_updated(room);
 942
 943        Ok(())
 944    }
 945
 946    async fn update_user_contacts(self: &Arc<Server>, user_id: UserId) -> Result<()> {
 947        let contacts = self.app_state.db.get_contacts(user_id).await?;
 948        let store = self.store().await;
 949        let updated_contact = store.contact_for_user(user_id, false);
 950        for contact in contacts {
 951            if let db::Contact::Accepted {
 952                user_id: contact_user_id,
 953                ..
 954            } = contact
 955            {
 956                for contact_conn_id in store.connection_ids_for_user(contact_user_id) {
 957                    self.peer
 958                        .send(
 959                            contact_conn_id,
 960                            proto::UpdateContacts {
 961                                contacts: vec![updated_contact.clone()],
 962                                remove_contacts: Default::default(),
 963                                incoming_requests: Default::default(),
 964                                remove_incoming_requests: Default::default(),
 965                                outgoing_requests: Default::default(),
 966                                remove_outgoing_requests: Default::default(),
 967                            },
 968                        )
 969                        .trace_err();
 970                }
 971            }
 972        }
 973        Ok(())
 974    }
 975
 976    async fn join_project(
 977        self: Arc<Server>,
 978        request: TypedEnvelope<proto::JoinProject>,
 979        response: Response<proto::JoinProject>,
 980    ) -> Result<()> {
 981        let project_id = ProjectId::from_proto(request.payload.project_id);
 982
 983        let host_user_id;
 984        let guest_user_id;
 985        let host_connection_id;
 986        {
 987            let state = self.store().await;
 988            let project = state.project(project_id)?;
 989            host_user_id = project.host.user_id;
 990            host_connection_id = project.host_connection_id;
 991            guest_user_id = state.user_id_for_connection(request.sender_id)?;
 992        };
 993
 994        tracing::info!(%project_id, %host_user_id, %host_connection_id, "join project");
 995
 996        let mut store = self.store().await;
 997        let (project, replica_id) = store.join_project(request.sender_id, project_id)?;
 998        let peer_count = project.guests.len();
 999        let mut collaborators = Vec::with_capacity(peer_count);
1000        collaborators.push(proto::Collaborator {
1001            peer_id: project.host_connection_id.0,
1002            replica_id: 0,
1003            user_id: project.host.user_id.to_proto(),
1004        });
1005        let worktrees = project
1006            .worktrees
1007            .iter()
1008            .map(|(id, worktree)| proto::WorktreeMetadata {
1009                id: *id,
1010                root_name: worktree.root_name.clone(),
1011                visible: worktree.visible,
1012            })
1013            .collect::<Vec<_>>();
1014
1015        // Add all guests other than the requesting user's own connections as collaborators
1016        for (guest_conn_id, guest) in &project.guests {
1017            if request.sender_id != *guest_conn_id {
1018                collaborators.push(proto::Collaborator {
1019                    peer_id: guest_conn_id.0,
1020                    replica_id: guest.replica_id as u32,
1021                    user_id: guest.user_id.to_proto(),
1022                });
1023            }
1024        }
1025
1026        for conn_id in project.connection_ids() {
1027            if conn_id != request.sender_id {
1028                self.peer.send(
1029                    conn_id,
1030                    proto::AddProjectCollaborator {
1031                        project_id: project_id.to_proto(),
1032                        collaborator: Some(proto::Collaborator {
1033                            peer_id: request.sender_id.0,
1034                            replica_id: replica_id as u32,
1035                            user_id: guest_user_id.to_proto(),
1036                        }),
1037                    },
1038                )?;
1039            }
1040        }
1041
1042        // First, we send the metadata associated with each worktree.
1043        response.send(proto::JoinProjectResponse {
1044            worktrees: worktrees.clone(),
1045            replica_id: replica_id as u32,
1046            collaborators: collaborators.clone(),
1047            language_servers: project.language_servers.clone(),
1048        })?;
1049
1050        for (worktree_id, worktree) in &project.worktrees {
1051            #[cfg(any(test, feature = "test-support"))]
1052            const MAX_CHUNK_SIZE: usize = 2;
1053            #[cfg(not(any(test, feature = "test-support")))]
1054            const MAX_CHUNK_SIZE: usize = 256;
1055
1056            // Stream this worktree's entries.
1057            let message = proto::UpdateWorktree {
1058                project_id: project_id.to_proto(),
1059                worktree_id: *worktree_id,
1060                root_name: worktree.root_name.clone(),
1061                updated_entries: worktree.entries.values().cloned().collect(),
1062                removed_entries: Default::default(),
1063                scan_id: worktree.scan_id,
1064                is_last_update: worktree.is_complete,
1065            };
1066            for update in proto::split_worktree_update(message, MAX_CHUNK_SIZE) {
1067                self.peer.send(request.sender_id, update.clone())?;
1068            }
1069
1070            // Stream this worktree's diagnostics.
1071            for summary in worktree.diagnostic_summaries.values() {
1072                self.peer.send(
1073                    request.sender_id,
1074                    proto::UpdateDiagnosticSummary {
1075                        project_id: project_id.to_proto(),
1076                        worktree_id: *worktree_id,
1077                        summary: Some(summary.clone()),
1078                    },
1079                )?;
1080            }
1081        }
1082
1083        for language_server in &project.language_servers {
1084            self.peer.send(
1085                request.sender_id,
1086                proto::UpdateLanguageServer {
1087                    project_id: project_id.to_proto(),
1088                    language_server_id: language_server.id,
1089                    variant: Some(
1090                        proto::update_language_server::Variant::DiskBasedDiagnosticsUpdated(
1091                            proto::LspDiskBasedDiagnosticsUpdated {},
1092                        ),
1093                    ),
1094                },
1095            )?;
1096        }
1097
1098        Ok(())
1099    }
1100
1101    async fn leave_project(
1102        self: Arc<Server>,
1103        request: TypedEnvelope<proto::LeaveProject>,
1104    ) -> Result<()> {
1105        let sender_id = request.sender_id;
1106        let project_id = ProjectId::from_proto(request.payload.project_id);
1107        let project;
1108        {
1109            let mut store = self.store().await;
1110            project = store.leave_project(project_id, sender_id)?;
1111            tracing::info!(
1112                %project_id,
1113                host_user_id = %project.host_user_id,
1114                host_connection_id = %project.host_connection_id,
1115                "leave project"
1116            );
1117
1118            if project.remove_collaborator {
1119                broadcast(sender_id, project.connection_ids, |conn_id| {
1120                    self.peer.send(
1121                        conn_id,
1122                        proto::RemoveProjectCollaborator {
1123                            project_id: project_id.to_proto(),
1124                            peer_id: sender_id.0,
1125                        },
1126                    )
1127                });
1128            }
1129        }
1130
1131        Ok(())
1132    }
1133
1134    async fn update_project(
1135        self: Arc<Server>,
1136        request: TypedEnvelope<proto::UpdateProject>,
1137    ) -> Result<()> {
1138        let project_id = ProjectId::from_proto(request.payload.project_id);
1139        {
1140            let mut state = self.store().await;
1141            let guest_connection_ids = state
1142                .read_project(project_id, request.sender_id)?
1143                .guest_connection_ids();
1144            let room =
1145                state.update_project(project_id, &request.payload.worktrees, request.sender_id)?;
1146            broadcast(request.sender_id, guest_connection_ids, |connection_id| {
1147                self.peer
1148                    .forward_send(request.sender_id, connection_id, request.payload.clone())
1149            });
1150            self.room_updated(room);
1151        };
1152
1153        Ok(())
1154    }
1155
1156    async fn register_project_activity(
1157        self: Arc<Server>,
1158        request: TypedEnvelope<proto::RegisterProjectActivity>,
1159    ) -> Result<()> {
1160        self.store().await.register_project_activity(
1161            ProjectId::from_proto(request.payload.project_id),
1162            request.sender_id,
1163        )?;
1164        Ok(())
1165    }
1166
1167    async fn update_worktree(
1168        self: Arc<Server>,
1169        request: TypedEnvelope<proto::UpdateWorktree>,
1170        response: Response<proto::UpdateWorktree>,
1171    ) -> Result<()> {
1172        let project_id = ProjectId::from_proto(request.payload.project_id);
1173        let worktree_id = request.payload.worktree_id;
1174        let connection_ids = self.store().await.update_worktree(
1175            request.sender_id,
1176            project_id,
1177            worktree_id,
1178            &request.payload.root_name,
1179            &request.payload.removed_entries,
1180            &request.payload.updated_entries,
1181            request.payload.scan_id,
1182            request.payload.is_last_update,
1183        )?;
1184
1185        broadcast(request.sender_id, connection_ids, |connection_id| {
1186            self.peer
1187                .forward_send(request.sender_id, connection_id, request.payload.clone())
1188        });
1189        response.send(proto::Ack {})?;
1190        Ok(())
1191    }
1192
1193    async fn update_worktree_extensions(
1194        self: Arc<Server>,
1195        request: TypedEnvelope<proto::UpdateWorktreeExtensions>,
1196    ) -> Result<()> {
1197        let project_id = ProjectId::from_proto(request.payload.project_id);
1198        let worktree_id = request.payload.worktree_id;
1199        let extensions = request
1200            .payload
1201            .extensions
1202            .into_iter()
1203            .zip(request.payload.counts)
1204            .collect();
1205        self.app_state
1206            .db
1207            .update_worktree_extensions(project_id, worktree_id, extensions)
1208            .await?;
1209        Ok(())
1210    }
1211
1212    async fn update_diagnostic_summary(
1213        self: Arc<Server>,
1214        request: TypedEnvelope<proto::UpdateDiagnosticSummary>,
1215    ) -> Result<()> {
1216        let summary = request
1217            .payload
1218            .summary
1219            .clone()
1220            .ok_or_else(|| anyhow!("invalid summary"))?;
1221        let receiver_ids = self.store().await.update_diagnostic_summary(
1222            ProjectId::from_proto(request.payload.project_id),
1223            request.payload.worktree_id,
1224            request.sender_id,
1225            summary,
1226        )?;
1227
1228        broadcast(request.sender_id, receiver_ids, |connection_id| {
1229            self.peer
1230                .forward_send(request.sender_id, connection_id, request.payload.clone())
1231        });
1232        Ok(())
1233    }
1234
1235    async fn start_language_server(
1236        self: Arc<Server>,
1237        request: TypedEnvelope<proto::StartLanguageServer>,
1238    ) -> Result<()> {
1239        let receiver_ids = self.store().await.start_language_server(
1240            ProjectId::from_proto(request.payload.project_id),
1241            request.sender_id,
1242            request
1243                .payload
1244                .server
1245                .clone()
1246                .ok_or_else(|| anyhow!("invalid language server"))?,
1247        )?;
1248        broadcast(request.sender_id, receiver_ids, |connection_id| {
1249            self.peer
1250                .forward_send(request.sender_id, connection_id, request.payload.clone())
1251        });
1252        Ok(())
1253    }
1254
1255    async fn update_language_server(
1256        self: Arc<Server>,
1257        request: TypedEnvelope<proto::UpdateLanguageServer>,
1258    ) -> Result<()> {
1259        let receiver_ids = self.store().await.project_connection_ids(
1260            ProjectId::from_proto(request.payload.project_id),
1261            request.sender_id,
1262        )?;
1263        broadcast(request.sender_id, receiver_ids, |connection_id| {
1264            self.peer
1265                .forward_send(request.sender_id, connection_id, request.payload.clone())
1266        });
1267        Ok(())
1268    }
1269
1270    async fn forward_project_request<T>(
1271        self: Arc<Server>,
1272        request: TypedEnvelope<T>,
1273        response: Response<T>,
1274    ) -> Result<()>
1275    where
1276        T: EntityMessage + RequestMessage,
1277    {
1278        let project_id = ProjectId::from_proto(request.payload.remote_entity_id());
1279        let host_connection_id = self
1280            .store()
1281            .await
1282            .read_project(project_id, request.sender_id)?
1283            .host_connection_id;
1284        let payload = self
1285            .peer
1286            .forward_request(request.sender_id, host_connection_id, request.payload)
1287            .await?;
1288
1289        // Ensure project still exists by the time we get the response from the host.
1290        self.store()
1291            .await
1292            .read_project(project_id, request.sender_id)?;
1293
1294        response.send(payload)?;
1295        Ok(())
1296    }
1297
1298    async fn save_buffer(
1299        self: Arc<Server>,
1300        request: TypedEnvelope<proto::SaveBuffer>,
1301        response: Response<proto::SaveBuffer>,
1302    ) -> Result<()> {
1303        let project_id = ProjectId::from_proto(request.payload.project_id);
1304        let host = self
1305            .store()
1306            .await
1307            .read_project(project_id, request.sender_id)?
1308            .host_connection_id;
1309        let response_payload = self
1310            .peer
1311            .forward_request(request.sender_id, host, request.payload.clone())
1312            .await?;
1313
1314        let mut guests = self
1315            .store()
1316            .await
1317            .read_project(project_id, request.sender_id)?
1318            .connection_ids();
1319        guests.retain(|guest_connection_id| *guest_connection_id != request.sender_id);
1320        broadcast(host, guests, |conn_id| {
1321            self.peer
1322                .forward_send(host, conn_id, response_payload.clone())
1323        });
1324        response.send(response_payload)?;
1325        Ok(())
1326    }
1327
1328    async fn create_buffer_for_peer(
1329        self: Arc<Server>,
1330        request: TypedEnvelope<proto::CreateBufferForPeer>,
1331    ) -> Result<()> {
1332        self.peer.forward_send(
1333            request.sender_id,
1334            ConnectionId(request.payload.peer_id),
1335            request.payload,
1336        )?;
1337        Ok(())
1338    }
1339
1340    async fn update_buffer(
1341        self: Arc<Server>,
1342        request: TypedEnvelope<proto::UpdateBuffer>,
1343        response: Response<proto::UpdateBuffer>,
1344    ) -> Result<()> {
1345        let project_id = ProjectId::from_proto(request.payload.project_id);
1346        let receiver_ids = {
1347            let mut store = self.store().await;
1348            store.register_project_activity(project_id, request.sender_id)?;
1349            store.project_connection_ids(project_id, request.sender_id)?
1350        };
1351
1352        broadcast(request.sender_id, receiver_ids, |connection_id| {
1353            self.peer
1354                .forward_send(request.sender_id, connection_id, request.payload.clone())
1355        });
1356        response.send(proto::Ack {})?;
1357        Ok(())
1358    }
1359
1360    async fn update_buffer_file(
1361        self: Arc<Server>,
1362        request: TypedEnvelope<proto::UpdateBufferFile>,
1363    ) -> Result<()> {
1364        let receiver_ids = self.store().await.project_connection_ids(
1365            ProjectId::from_proto(request.payload.project_id),
1366            request.sender_id,
1367        )?;
1368        broadcast(request.sender_id, receiver_ids, |connection_id| {
1369            self.peer
1370                .forward_send(request.sender_id, connection_id, request.payload.clone())
1371        });
1372        Ok(())
1373    }
1374
1375    async fn buffer_reloaded(
1376        self: Arc<Server>,
1377        request: TypedEnvelope<proto::BufferReloaded>,
1378    ) -> Result<()> {
1379        let receiver_ids = self.store().await.project_connection_ids(
1380            ProjectId::from_proto(request.payload.project_id),
1381            request.sender_id,
1382        )?;
1383        broadcast(request.sender_id, receiver_ids, |connection_id| {
1384            self.peer
1385                .forward_send(request.sender_id, connection_id, request.payload.clone())
1386        });
1387        Ok(())
1388    }
1389
1390    async fn buffer_saved(
1391        self: Arc<Server>,
1392        request: TypedEnvelope<proto::BufferSaved>,
1393    ) -> Result<()> {
1394        let receiver_ids = self.store().await.project_connection_ids(
1395            ProjectId::from_proto(request.payload.project_id),
1396            request.sender_id,
1397        )?;
1398        broadcast(request.sender_id, receiver_ids, |connection_id| {
1399            self.peer
1400                .forward_send(request.sender_id, connection_id, request.payload.clone())
1401        });
1402        Ok(())
1403    }
1404
1405    async fn follow(
1406        self: Arc<Self>,
1407        request: TypedEnvelope<proto::Follow>,
1408        response: Response<proto::Follow>,
1409    ) -> Result<()> {
1410        let project_id = ProjectId::from_proto(request.payload.project_id);
1411        let leader_id = ConnectionId(request.payload.leader_id);
1412        let follower_id = request.sender_id;
1413        {
1414            let mut store = self.store().await;
1415            if !store
1416                .project_connection_ids(project_id, follower_id)?
1417                .contains(&leader_id)
1418            {
1419                Err(anyhow!("no such peer"))?;
1420            }
1421
1422            store.register_project_activity(project_id, follower_id)?;
1423        }
1424
1425        let mut response_payload = self
1426            .peer
1427            .forward_request(request.sender_id, leader_id, request.payload)
1428            .await?;
1429        response_payload
1430            .views
1431            .retain(|view| view.leader_id != Some(follower_id.0));
1432        response.send(response_payload)?;
1433        Ok(())
1434    }
1435
1436    async fn unfollow(self: Arc<Self>, request: TypedEnvelope<proto::Unfollow>) -> Result<()> {
1437        let project_id = ProjectId::from_proto(request.payload.project_id);
1438        let leader_id = ConnectionId(request.payload.leader_id);
1439        let mut store = self.store().await;
1440        if !store
1441            .project_connection_ids(project_id, request.sender_id)?
1442            .contains(&leader_id)
1443        {
1444            Err(anyhow!("no such peer"))?;
1445        }
1446        store.register_project_activity(project_id, request.sender_id)?;
1447        self.peer
1448            .forward_send(request.sender_id, leader_id, request.payload)?;
1449        Ok(())
1450    }
1451
1452    async fn update_followers(
1453        self: Arc<Self>,
1454        request: TypedEnvelope<proto::UpdateFollowers>,
1455    ) -> Result<()> {
1456        let project_id = ProjectId::from_proto(request.payload.project_id);
1457        let mut store = self.store().await;
1458        store.register_project_activity(project_id, request.sender_id)?;
1459        let connection_ids = store.project_connection_ids(project_id, request.sender_id)?;
1460        let leader_id = request
1461            .payload
1462            .variant
1463            .as_ref()
1464            .and_then(|variant| match variant {
1465                proto::update_followers::Variant::CreateView(payload) => payload.leader_id,
1466                proto::update_followers::Variant::UpdateView(payload) => payload.leader_id,
1467                proto::update_followers::Variant::UpdateActiveView(payload) => payload.leader_id,
1468            });
1469        for follower_id in &request.payload.follower_ids {
1470            let follower_id = ConnectionId(*follower_id);
1471            if connection_ids.contains(&follower_id) && Some(follower_id.0) != leader_id {
1472                self.peer
1473                    .forward_send(request.sender_id, follower_id, request.payload.clone())?;
1474            }
1475        }
1476        Ok(())
1477    }
1478
1479    async fn get_channels(
1480        self: Arc<Server>,
1481        request: TypedEnvelope<proto::GetChannels>,
1482        response: Response<proto::GetChannels>,
1483    ) -> Result<()> {
1484        let user_id = self
1485            .store()
1486            .await
1487            .user_id_for_connection(request.sender_id)?;
1488        let channels = self.app_state.db.get_accessible_channels(user_id).await?;
1489        response.send(proto::GetChannelsResponse {
1490            channels: channels
1491                .into_iter()
1492                .map(|chan| proto::Channel {
1493                    id: chan.id.to_proto(),
1494                    name: chan.name,
1495                })
1496                .collect(),
1497        })?;
1498        Ok(())
1499    }
1500
1501    async fn get_users(
1502        self: Arc<Server>,
1503        request: TypedEnvelope<proto::GetUsers>,
1504        response: Response<proto::GetUsers>,
1505    ) -> Result<()> {
1506        let user_ids = request
1507            .payload
1508            .user_ids
1509            .into_iter()
1510            .map(UserId::from_proto)
1511            .collect();
1512        let users = self
1513            .app_state
1514            .db
1515            .get_users_by_ids(user_ids)
1516            .await?
1517            .into_iter()
1518            .map(|user| proto::User {
1519                id: user.id.to_proto(),
1520                avatar_url: format!("https://github.com/{}.png?size=128", user.github_login),
1521                github_login: user.github_login,
1522            })
1523            .collect();
1524        response.send(proto::UsersResponse { users })?;
1525        Ok(())
1526    }
1527
1528    async fn fuzzy_search_users(
1529        self: Arc<Server>,
1530        request: TypedEnvelope<proto::FuzzySearchUsers>,
1531        response: Response<proto::FuzzySearchUsers>,
1532    ) -> Result<()> {
1533        let user_id = self
1534            .store()
1535            .await
1536            .user_id_for_connection(request.sender_id)?;
1537        let query = request.payload.query;
1538        let db = &self.app_state.db;
1539        let users = match query.len() {
1540            0 => vec![],
1541            1 | 2 => db
1542                .get_user_by_github_account(&query, None)
1543                .await?
1544                .into_iter()
1545                .collect(),
1546            _ => db.fuzzy_search_users(&query, 10).await?,
1547        };
1548        let users = users
1549            .into_iter()
1550            .filter(|user| user.id != user_id)
1551            .map(|user| proto::User {
1552                id: user.id.to_proto(),
1553                avatar_url: format!("https://github.com/{}.png?size=128", user.github_login),
1554                github_login: user.github_login,
1555            })
1556            .collect();
1557        response.send(proto::UsersResponse { users })?;
1558        Ok(())
1559    }
1560
1561    async fn request_contact(
1562        self: Arc<Server>,
1563        request: TypedEnvelope<proto::RequestContact>,
1564        response: Response<proto::RequestContact>,
1565    ) -> Result<()> {
1566        let requester_id = self
1567            .store()
1568            .await
1569            .user_id_for_connection(request.sender_id)?;
1570        let responder_id = UserId::from_proto(request.payload.responder_id);
1571        if requester_id == responder_id {
1572            return Err(anyhow!("cannot add yourself as a contact"))?;
1573        }
1574
1575        self.app_state
1576            .db
1577            .send_contact_request(requester_id, responder_id)
1578            .await?;
1579
1580        // Update outgoing contact requests of requester
1581        let mut update = proto::UpdateContacts::default();
1582        update.outgoing_requests.push(responder_id.to_proto());
1583        for connection_id in self.store().await.connection_ids_for_user(requester_id) {
1584            self.peer.send(connection_id, update.clone())?;
1585        }
1586
1587        // Update incoming contact requests of responder
1588        let mut update = proto::UpdateContacts::default();
1589        update
1590            .incoming_requests
1591            .push(proto::IncomingContactRequest {
1592                requester_id: requester_id.to_proto(),
1593                should_notify: true,
1594            });
1595        for connection_id in self.store().await.connection_ids_for_user(responder_id) {
1596            self.peer.send(connection_id, update.clone())?;
1597        }
1598
1599        response.send(proto::Ack {})?;
1600        Ok(())
1601    }
1602
1603    async fn respond_to_contact_request(
1604        self: Arc<Server>,
1605        request: TypedEnvelope<proto::RespondToContactRequest>,
1606        response: Response<proto::RespondToContactRequest>,
1607    ) -> Result<()> {
1608        let responder_id = self
1609            .store()
1610            .await
1611            .user_id_for_connection(request.sender_id)?;
1612        let requester_id = UserId::from_proto(request.payload.requester_id);
1613        if request.payload.response == proto::ContactRequestResponse::Dismiss as i32 {
1614            self.app_state
1615                .db
1616                .dismiss_contact_notification(responder_id, requester_id)
1617                .await?;
1618        } else {
1619            let accept = request.payload.response == proto::ContactRequestResponse::Accept as i32;
1620            self.app_state
1621                .db
1622                .respond_to_contact_request(responder_id, requester_id, accept)
1623                .await?;
1624
1625            let store = self.store().await;
1626            // Update responder with new contact
1627            let mut update = proto::UpdateContacts::default();
1628            if accept {
1629                update
1630                    .contacts
1631                    .push(store.contact_for_user(requester_id, false));
1632            }
1633            update
1634                .remove_incoming_requests
1635                .push(requester_id.to_proto());
1636            for connection_id in store.connection_ids_for_user(responder_id) {
1637                self.peer.send(connection_id, update.clone())?;
1638            }
1639
1640            // Update requester with new contact
1641            let mut update = proto::UpdateContacts::default();
1642            if accept {
1643                update
1644                    .contacts
1645                    .push(store.contact_for_user(responder_id, true));
1646            }
1647            update
1648                .remove_outgoing_requests
1649                .push(responder_id.to_proto());
1650            for connection_id in store.connection_ids_for_user(requester_id) {
1651                self.peer.send(connection_id, update.clone())?;
1652            }
1653        }
1654
1655        response.send(proto::Ack {})?;
1656        Ok(())
1657    }
1658
1659    async fn remove_contact(
1660        self: Arc<Server>,
1661        request: TypedEnvelope<proto::RemoveContact>,
1662        response: Response<proto::RemoveContact>,
1663    ) -> Result<()> {
1664        let requester_id = self
1665            .store()
1666            .await
1667            .user_id_for_connection(request.sender_id)?;
1668        let responder_id = UserId::from_proto(request.payload.user_id);
1669        self.app_state
1670            .db
1671            .remove_contact(requester_id, responder_id)
1672            .await?;
1673
1674        // Update outgoing contact requests of requester
1675        let mut update = proto::UpdateContacts::default();
1676        update
1677            .remove_outgoing_requests
1678            .push(responder_id.to_proto());
1679        for connection_id in self.store().await.connection_ids_for_user(requester_id) {
1680            self.peer.send(connection_id, update.clone())?;
1681        }
1682
1683        // Update incoming contact requests of responder
1684        let mut update = proto::UpdateContacts::default();
1685        update
1686            .remove_incoming_requests
1687            .push(requester_id.to_proto());
1688        for connection_id in self.store().await.connection_ids_for_user(responder_id) {
1689            self.peer.send(connection_id, update.clone())?;
1690        }
1691
1692        response.send(proto::Ack {})?;
1693        Ok(())
1694    }
1695
1696    async fn join_channel(
1697        self: Arc<Self>,
1698        request: TypedEnvelope<proto::JoinChannel>,
1699        response: Response<proto::JoinChannel>,
1700    ) -> Result<()> {
1701        let user_id = self
1702            .store()
1703            .await
1704            .user_id_for_connection(request.sender_id)?;
1705        let channel_id = ChannelId::from_proto(request.payload.channel_id);
1706        if !self
1707            .app_state
1708            .db
1709            .can_user_access_channel(user_id, channel_id)
1710            .await?
1711        {
1712            Err(anyhow!("access denied"))?;
1713        }
1714
1715        self.store()
1716            .await
1717            .join_channel(request.sender_id, channel_id);
1718        let messages = self
1719            .app_state
1720            .db
1721            .get_channel_messages(channel_id, MESSAGE_COUNT_PER_PAGE, None)
1722            .await?
1723            .into_iter()
1724            .map(|msg| proto::ChannelMessage {
1725                id: msg.id.to_proto(),
1726                body: msg.body,
1727                timestamp: msg.sent_at.unix_timestamp() as u64,
1728                sender_id: msg.sender_id.to_proto(),
1729                nonce: Some(msg.nonce.as_u128().into()),
1730            })
1731            .collect::<Vec<_>>();
1732        response.send(proto::JoinChannelResponse {
1733            done: messages.len() < MESSAGE_COUNT_PER_PAGE,
1734            messages,
1735        })?;
1736        Ok(())
1737    }
1738
1739    async fn leave_channel(
1740        self: Arc<Self>,
1741        request: TypedEnvelope<proto::LeaveChannel>,
1742    ) -> Result<()> {
1743        let user_id = self
1744            .store()
1745            .await
1746            .user_id_for_connection(request.sender_id)?;
1747        let channel_id = ChannelId::from_proto(request.payload.channel_id);
1748        if !self
1749            .app_state
1750            .db
1751            .can_user_access_channel(user_id, channel_id)
1752            .await?
1753        {
1754            Err(anyhow!("access denied"))?;
1755        }
1756
1757        self.store()
1758            .await
1759            .leave_channel(request.sender_id, channel_id);
1760
1761        Ok(())
1762    }
1763
1764    async fn send_channel_message(
1765        self: Arc<Self>,
1766        request: TypedEnvelope<proto::SendChannelMessage>,
1767        response: Response<proto::SendChannelMessage>,
1768    ) -> Result<()> {
1769        let channel_id = ChannelId::from_proto(request.payload.channel_id);
1770        let user_id;
1771        let connection_ids;
1772        {
1773            let state = self.store().await;
1774            user_id = state.user_id_for_connection(request.sender_id)?;
1775            connection_ids = state.channel_connection_ids(channel_id)?;
1776        }
1777
1778        // Validate the message body.
1779        let body = request.payload.body.trim().to_string();
1780        if body.len() > MAX_MESSAGE_LEN {
1781            return Err(anyhow!("message is too long"))?;
1782        }
1783        if body.is_empty() {
1784            return Err(anyhow!("message can't be blank"))?;
1785        }
1786
1787        let timestamp = OffsetDateTime::now_utc();
1788        let nonce = request
1789            .payload
1790            .nonce
1791            .ok_or_else(|| anyhow!("nonce can't be blank"))?;
1792
1793        let message_id = self
1794            .app_state
1795            .db
1796            .create_channel_message(channel_id, user_id, &body, timestamp, nonce.clone().into())
1797            .await?
1798            .to_proto();
1799        let message = proto::ChannelMessage {
1800            sender_id: user_id.to_proto(),
1801            id: message_id,
1802            body,
1803            timestamp: timestamp.unix_timestamp() as u64,
1804            nonce: Some(nonce),
1805        };
1806        broadcast(request.sender_id, connection_ids, |conn_id| {
1807            self.peer.send(
1808                conn_id,
1809                proto::ChannelMessageSent {
1810                    channel_id: channel_id.to_proto(),
1811                    message: Some(message.clone()),
1812                },
1813            )
1814        });
1815        response.send(proto::SendChannelMessageResponse {
1816            message: Some(message),
1817        })?;
1818        Ok(())
1819    }
1820
1821    async fn get_channel_messages(
1822        self: Arc<Self>,
1823        request: TypedEnvelope<proto::GetChannelMessages>,
1824        response: Response<proto::GetChannelMessages>,
1825    ) -> Result<()> {
1826        let user_id = self
1827            .store()
1828            .await
1829            .user_id_for_connection(request.sender_id)?;
1830        let channel_id = ChannelId::from_proto(request.payload.channel_id);
1831        if !self
1832            .app_state
1833            .db
1834            .can_user_access_channel(user_id, channel_id)
1835            .await?
1836        {
1837            Err(anyhow!("access denied"))?;
1838        }
1839
1840        let messages = self
1841            .app_state
1842            .db
1843            .get_channel_messages(
1844                channel_id,
1845                MESSAGE_COUNT_PER_PAGE,
1846                Some(MessageId::from_proto(request.payload.before_message_id)),
1847            )
1848            .await?
1849            .into_iter()
1850            .map(|msg| proto::ChannelMessage {
1851                id: msg.id.to_proto(),
1852                body: msg.body,
1853                timestamp: msg.sent_at.unix_timestamp() as u64,
1854                sender_id: msg.sender_id.to_proto(),
1855                nonce: Some(msg.nonce.as_u128().into()),
1856            })
1857            .collect::<Vec<_>>();
1858        response.send(proto::GetChannelMessagesResponse {
1859            done: messages.len() < MESSAGE_COUNT_PER_PAGE,
1860            messages,
1861        })?;
1862        Ok(())
1863    }
1864
1865    async fn update_diff_base(
1866        self: Arc<Server>,
1867        request: TypedEnvelope<proto::UpdateDiffBase>,
1868    ) -> Result<()> {
1869        let receiver_ids = self.store().await.project_connection_ids(
1870            ProjectId::from_proto(request.payload.project_id),
1871            request.sender_id,
1872        )?;
1873        broadcast(request.sender_id, receiver_ids, |connection_id| {
1874            self.peer
1875                .forward_send(request.sender_id, connection_id, request.payload.clone())
1876        });
1877        Ok(())
1878    }
1879
1880    async fn get_private_user_info(
1881        self: Arc<Self>,
1882        request: TypedEnvelope<proto::GetPrivateUserInfo>,
1883        response: Response<proto::GetPrivateUserInfo>,
1884    ) -> Result<()> {
1885        let user_id = self
1886            .store()
1887            .await
1888            .user_id_for_connection(request.sender_id)?;
1889        let metrics_id = self.app_state.db.get_user_metrics_id(user_id).await?;
1890        let user = self
1891            .app_state
1892            .db
1893            .get_user_by_id(user_id)
1894            .await?
1895            .ok_or_else(|| anyhow!("user not found"))?;
1896        response.send(proto::GetPrivateUserInfoResponse {
1897            metrics_id,
1898            staff: user.admin,
1899        })?;
1900        Ok(())
1901    }
1902
1903    pub(crate) async fn store(&self) -> StoreGuard<'_> {
1904        #[cfg(test)]
1905        tokio::task::yield_now().await;
1906        let guard = self.store.lock().await;
1907        #[cfg(test)]
1908        tokio::task::yield_now().await;
1909        StoreGuard {
1910            guard,
1911            _not_send: PhantomData,
1912        }
1913    }
1914
1915    pub async fn snapshot<'a>(self: &'a Arc<Self>) -> ServerSnapshot<'a> {
1916        ServerSnapshot {
1917            store: self.store().await,
1918            peer: &self.peer,
1919        }
1920    }
1921}
1922
1923impl<'a> Deref for StoreGuard<'a> {
1924    type Target = Store;
1925
1926    fn deref(&self) -> &Self::Target {
1927        &*self.guard
1928    }
1929}
1930
1931impl<'a> DerefMut for StoreGuard<'a> {
1932    fn deref_mut(&mut self) -> &mut Self::Target {
1933        &mut *self.guard
1934    }
1935}
1936
1937impl<'a> Drop for StoreGuard<'a> {
1938    fn drop(&mut self) {
1939        #[cfg(test)]
1940        self.check_invariants();
1941    }
1942}
1943
1944impl Executor for RealExecutor {
1945    type Sleep = Sleep;
1946
1947    fn spawn_detached<F: 'static + Send + Future<Output = ()>>(&self, future: F) {
1948        tokio::task::spawn(future);
1949    }
1950
1951    fn sleep(&self, duration: Duration) -> Self::Sleep {
1952        tokio::time::sleep(duration)
1953    }
1954}
1955
1956fn broadcast<F>(
1957    sender_id: ConnectionId,
1958    receiver_ids: impl IntoIterator<Item = ConnectionId>,
1959    mut f: F,
1960) where
1961    F: FnMut(ConnectionId) -> anyhow::Result<()>,
1962{
1963    for receiver_id in receiver_ids {
1964        if receiver_id != sender_id {
1965            f(receiver_id).trace_err();
1966        }
1967    }
1968}
1969
1970lazy_static! {
1971    static ref ZED_PROTOCOL_VERSION: HeaderName = HeaderName::from_static("x-zed-protocol-version");
1972}
1973
1974pub struct ProtocolVersion(u32);
1975
1976impl Header for ProtocolVersion {
1977    fn name() -> &'static HeaderName {
1978        &ZED_PROTOCOL_VERSION
1979    }
1980
1981    fn decode<'i, I>(values: &mut I) -> Result<Self, axum::headers::Error>
1982    where
1983        Self: Sized,
1984        I: Iterator<Item = &'i axum::http::HeaderValue>,
1985    {
1986        let version = values
1987            .next()
1988            .ok_or_else(axum::headers::Error::invalid)?
1989            .to_str()
1990            .map_err(|_| axum::headers::Error::invalid())?
1991            .parse()
1992            .map_err(|_| axum::headers::Error::invalid())?;
1993        Ok(Self(version))
1994    }
1995
1996    fn encode<E: Extend<axum::http::HeaderValue>>(&self, values: &mut E) {
1997        values.extend([self.0.to_string().parse().unwrap()]);
1998    }
1999}
2000
2001pub fn routes(server: Arc<Server>) -> Router<Body> {
2002    Router::new()
2003        .route("/rpc", get(handle_websocket_request))
2004        .layer(
2005            ServiceBuilder::new()
2006                .layer(Extension(server.app_state.clone()))
2007                .layer(middleware::from_fn(auth::validate_header)),
2008        )
2009        .route("/metrics", get(handle_metrics))
2010        .layer(Extension(server))
2011}
2012
2013pub async fn handle_websocket_request(
2014    TypedHeader(ProtocolVersion(protocol_version)): TypedHeader<ProtocolVersion>,
2015    ConnectInfo(socket_address): ConnectInfo<SocketAddr>,
2016    Extension(server): Extension<Arc<Server>>,
2017    Extension(user): Extension<User>,
2018    ws: WebSocketUpgrade,
2019) -> axum::response::Response {
2020    if protocol_version != rpc::PROTOCOL_VERSION {
2021        return (
2022            StatusCode::UPGRADE_REQUIRED,
2023            "client must be upgraded".to_string(),
2024        )
2025            .into_response();
2026    }
2027    let socket_address = socket_address.to_string();
2028    ws.on_upgrade(move |socket| {
2029        use util::ResultExt;
2030        let socket = socket
2031            .map_ok(to_tungstenite_message)
2032            .err_into()
2033            .with(|message| async move { Ok(to_axum_message(message)) });
2034        let connection = Connection::new(Box::pin(socket));
2035        async move {
2036            server
2037                .handle_connection(connection, socket_address, user, None, RealExecutor)
2038                .await
2039                .log_err();
2040        }
2041    })
2042}
2043
2044pub async fn handle_metrics(Extension(server): Extension<Arc<Server>>) -> axum::response::Response {
2045    // We call `store_mut` here for its side effects of updating metrics.
2046    let metrics = server.store().await.metrics();
2047    METRIC_CONNECTIONS.set(metrics.connections as _);
2048    METRIC_REGISTERED_PROJECTS.set(metrics.registered_projects as _);
2049    METRIC_ACTIVE_PROJECTS.set(metrics.active_projects as _);
2050    METRIC_SHARED_PROJECTS.set(metrics.shared_projects as _);
2051
2052    let encoder = prometheus::TextEncoder::new();
2053    let metric_families = prometheus::gather();
2054    match encoder.encode_to_string(&metric_families) {
2055        Ok(string) => (StatusCode::OK, string).into_response(),
2056        Err(error) => (
2057            StatusCode::INTERNAL_SERVER_ERROR,
2058            format!("failed to encode metrics {:?}", error),
2059        )
2060            .into_response(),
2061    }
2062}
2063
2064fn to_axum_message(message: TungsteniteMessage) -> AxumMessage {
2065    match message {
2066        TungsteniteMessage::Text(payload) => AxumMessage::Text(payload),
2067        TungsteniteMessage::Binary(payload) => AxumMessage::Binary(payload),
2068        TungsteniteMessage::Ping(payload) => AxumMessage::Ping(payload),
2069        TungsteniteMessage::Pong(payload) => AxumMessage::Pong(payload),
2070        TungsteniteMessage::Close(frame) => AxumMessage::Close(frame.map(|frame| AxumCloseFrame {
2071            code: frame.code.into(),
2072            reason: frame.reason,
2073        })),
2074    }
2075}
2076
2077fn to_tungstenite_message(message: AxumMessage) -> TungsteniteMessage {
2078    match message {
2079        AxumMessage::Text(payload) => TungsteniteMessage::Text(payload),
2080        AxumMessage::Binary(payload) => TungsteniteMessage::Binary(payload),
2081        AxumMessage::Ping(payload) => TungsteniteMessage::Ping(payload),
2082        AxumMessage::Pong(payload) => TungsteniteMessage::Pong(payload),
2083        AxumMessage::Close(frame) => {
2084            TungsteniteMessage::Close(frame.map(|frame| TungsteniteCloseFrame {
2085                code: frame.code.into(),
2086                reason: frame.reason,
2087            }))
2088        }
2089    }
2090}
2091
2092pub trait ResultExt {
2093    type Ok;
2094
2095    fn trace_err(self) -> Option<Self::Ok>;
2096}
2097
2098impl<T, E> ResultExt for Result<T, E>
2099where
2100    E: std::fmt::Debug,
2101{
2102    type Ok = T;
2103
2104    fn trace_err(self) -> Option<T> {
2105        match self {
2106            Ok(value) => Some(value),
2107            Err(error) => {
2108                tracing::error!("{:?}", error);
2109                None
2110            }
2111        }
2112    }
2113}