1use crate::{
   2    db::{self, NewUserParams, UserId},
   3    rpc::{CLEANUP_TIMEOUT, RECONNECT_TIMEOUT},
   4    tests::{TestClient, TestServer},
   5};
   6use anyhow::{anyhow, Result};
   7use call::ActiveCall;
   8use client::RECEIVE_TIMEOUT;
   9use collections::{BTreeMap, HashSet};
  10use editor::Bias;
  11use fs::{FakeFs, Fs as _};
  12use futures::StreamExt as _;
  13use gpui::{executor::Deterministic, ModelHandle, Task, TestAppContext};
  14use language::{range_to_lsp, FakeLspAdapter, Language, LanguageConfig, PointUtf16};
  15use lsp::FakeLanguageServer;
  16use parking_lot::Mutex;
  17use project::{search::SearchQuery, Project, ProjectPath};
  18use rand::{
  19    distributions::{Alphanumeric, DistString},
  20    prelude::*,
  21};
  22use serde::{Deserialize, Serialize};
  23use std::{
  24    env,
  25    ops::Range,
  26    path::{Path, PathBuf},
  27    rc::Rc,
  28    sync::{
  29        atomic::{AtomicBool, Ordering::SeqCst},
  30        Arc,
  31    },
  32};
  33use util::ResultExt;
  34
  35#[gpui::test(iterations = 100)]
  36async fn test_random_collaboration(
  37    cx: &mut TestAppContext,
  38    deterministic: Arc<Deterministic>,
  39    rng: StdRng,
  40) {
  41    deterministic.forbid_parking();
  42
  43    let max_peers = env::var("MAX_PEERS")
  44        .map(|i| i.parse().expect("invalid `MAX_PEERS` variable"))
  45        .unwrap_or(3);
  46    let max_operations = env::var("OPERATIONS")
  47        .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
  48        .unwrap_or(10);
  49
  50    let plan_load_path = path_env_var("LOAD_PLAN");
  51    let plan_save_path = path_env_var("SAVE_PLAN");
  52
  53    let mut server = TestServer::start(&deterministic).await;
  54    let db = server.app_state.db.clone();
  55
  56    let mut users = Vec::new();
  57    for ix in 0..max_peers {
  58        let username = format!("user-{}", ix + 1);
  59        let user_id = db
  60            .create_user(
  61                &format!("{username}@example.com"),
  62                false,
  63                NewUserParams {
  64                    github_login: username.clone(),
  65                    github_user_id: (ix + 1) as i32,
  66                    invite_count: 0,
  67                },
  68            )
  69            .await
  70            .unwrap()
  71            .user_id;
  72        users.push(UserTestPlan {
  73            user_id,
  74            username,
  75            online: false,
  76            next_root_id: 0,
  77            operation_ix: 0,
  78        });
  79    }
  80
  81    for (ix, user_a) in users.iter().enumerate() {
  82        for user_b in &users[ix + 1..] {
  83            server
  84                .app_state
  85                .db
  86                .send_contact_request(user_a.user_id, user_b.user_id)
  87                .await
  88                .unwrap();
  89            server
  90                .app_state
  91                .db
  92                .respond_to_contact_request(user_b.user_id, user_a.user_id, true)
  93                .await
  94                .unwrap();
  95        }
  96    }
  97
  98    let plan = Arc::new(Mutex::new(TestPlan::new(rng, users, max_operations)));
  99
 100    if let Some(path) = &plan_load_path {
 101        eprintln!("loaded plan from path {:?}", path);
 102        plan.lock().load(path);
 103    }
 104
 105    let mut clients = Vec::new();
 106    let mut client_tasks = Vec::new();
 107    let mut operation_channels = Vec::new();
 108
 109    loop {
 110        let Some((next_operation, skipped)) = plan.lock().next_server_operation(&clients) else { break };
 111        let applied = apply_server_operation(
 112            deterministic.clone(),
 113            &mut server,
 114            &mut clients,
 115            &mut client_tasks,
 116            &mut operation_channels,
 117            plan.clone(),
 118            next_operation,
 119            cx,
 120        )
 121        .await;
 122        if !applied {
 123            skipped.store(false, SeqCst);
 124        }
 125    }
 126
 127    drop(operation_channels);
 128    deterministic.start_waiting();
 129    futures::future::join_all(client_tasks).await;
 130    deterministic.finish_waiting();
 131    deterministic.run_until_parked();
 132
 133    if let Some(path) = &plan_save_path {
 134        eprintln!("saved test plan to path {:?}", path);
 135        plan.lock().save(path);
 136    }
 137
 138    for (client, client_cx) in &clients {
 139        for guest_project in client.remote_projects().iter() {
 140            guest_project.read_with(client_cx, |guest_project, cx| {
 141                let host_project = clients.iter().find_map(|(client, cx)| {
 142                    let project = client
 143                        .local_projects()
 144                        .iter()
 145                        .find(|host_project| {
 146                            host_project.read_with(cx, |host_project, _| {
 147                                host_project.remote_id() == guest_project.remote_id()
 148                            })
 149                        })?
 150                        .clone();
 151                    Some((project, cx))
 152                });
 153
 154                if !guest_project.is_read_only() {
 155                    if let Some((host_project, host_cx)) = host_project {
 156                        let host_worktree_snapshots =
 157                            host_project.read_with(host_cx, |host_project, cx| {
 158                                host_project
 159                                    .worktrees(cx)
 160                                    .map(|worktree| {
 161                                        let worktree = worktree.read(cx);
 162                                        (worktree.id(), worktree.snapshot())
 163                                    })
 164                                    .collect::<BTreeMap<_, _>>()
 165                            });
 166                        let guest_worktree_snapshots = guest_project
 167                            .worktrees(cx)
 168                            .map(|worktree| {
 169                                let worktree = worktree.read(cx);
 170                                (worktree.id(), worktree.snapshot())
 171                            })
 172                            .collect::<BTreeMap<_, _>>();
 173
 174                        assert_eq!(
 175                            guest_worktree_snapshots.keys().collect::<Vec<_>>(),
 176                            host_worktree_snapshots.keys().collect::<Vec<_>>(),
 177                            "{} has different worktrees than the host",
 178                            client.username
 179                        );
 180
 181                        for (id, host_snapshot) in &host_worktree_snapshots {
 182                            let guest_snapshot = &guest_worktree_snapshots[id];
 183                            assert_eq!(
 184                                guest_snapshot.root_name(),
 185                                host_snapshot.root_name(),
 186                                "{} has different root name than the host for worktree {}",
 187                                client.username,
 188                                id
 189                            );
 190                            assert_eq!(
 191                                guest_snapshot.abs_path(),
 192                                host_snapshot.abs_path(),
 193                                "{} has different abs path than the host for worktree {}",
 194                                client.username,
 195                                id
 196                            );
 197                            assert_eq!(
 198                                guest_snapshot.entries(false).collect::<Vec<_>>(),
 199                                host_snapshot.entries(false).collect::<Vec<_>>(),
 200                                "{} has different snapshot than the host for worktree {} ({:?}) and project {:?}",
 201                                client.username,
 202                                id,
 203                                host_snapshot.abs_path(),
 204                                host_project.read_with(host_cx, |project, _| project.remote_id())
 205                            );
 206                            assert_eq!(guest_snapshot.scan_id(), host_snapshot.scan_id());
 207                        }
 208                    }
 209                }
 210
 211                guest_project.check_invariants(cx);
 212            });
 213        }
 214
 215        let buffers = client.buffers().clone();
 216        for (guest_project, guest_buffers) in &buffers {
 217            let project_id = if guest_project.read_with(client_cx, |project, _| {
 218                project.is_local() || project.is_read_only()
 219            }) {
 220                continue;
 221            } else {
 222                guest_project
 223                    .read_with(client_cx, |project, _| project.remote_id())
 224                    .unwrap()
 225            };
 226            let guest_user_id = client.user_id().unwrap();
 227
 228            let host_project = clients.iter().find_map(|(client, cx)| {
 229                let project = client
 230                    .local_projects()
 231                    .iter()
 232                    .find(|host_project| {
 233                        host_project.read_with(cx, |host_project, _| {
 234                            host_project.remote_id() == Some(project_id)
 235                        })
 236                    })?
 237                    .clone();
 238                Some((client.user_id().unwrap(), project, cx))
 239            });
 240
 241            let (host_user_id, host_project, host_cx) =
 242                if let Some((host_user_id, host_project, host_cx)) = host_project {
 243                    (host_user_id, host_project, host_cx)
 244                } else {
 245                    continue;
 246                };
 247
 248            for guest_buffer in guest_buffers {
 249                let buffer_id = guest_buffer.read_with(client_cx, |buffer, _| buffer.remote_id());
 250                let host_buffer = host_project.read_with(host_cx, |project, cx| {
 251                    project.buffer_for_id(buffer_id, cx).unwrap_or_else(|| {
 252                        panic!(
 253                            "host does not have buffer for guest:{}, peer:{:?}, id:{}",
 254                            client.username,
 255                            client.peer_id(),
 256                            buffer_id
 257                        )
 258                    })
 259                });
 260                let path = host_buffer
 261                    .read_with(host_cx, |buffer, cx| buffer.file().unwrap().full_path(cx));
 262
 263                assert_eq!(
 264                    guest_buffer.read_with(client_cx, |buffer, _| buffer.deferred_ops_len()),
 265                    0,
 266                    "{}, buffer {}, path {:?} has deferred operations",
 267                    client.username,
 268                    buffer_id,
 269                    path,
 270                );
 271                assert_eq!(
 272                    guest_buffer.read_with(client_cx, |buffer, _| buffer.text()),
 273                    host_buffer.read_with(host_cx, |buffer, _| buffer.text()),
 274                    "{}, buffer {}, path {:?}, differs from the host's buffer",
 275                    client.username,
 276                    buffer_id,
 277                    path
 278                );
 279
 280                let host_file = host_buffer.read_with(host_cx, |b, _| b.file().cloned());
 281                let guest_file = guest_buffer.read_with(client_cx, |b, _| b.file().cloned());
 282                match (host_file, guest_file) {
 283                    (Some(host_file), Some(guest_file)) => {
 284                        assert_eq!(guest_file.path(), host_file.path());
 285                        assert_eq!(guest_file.is_deleted(), host_file.is_deleted());
 286                        assert_eq!(
 287                            guest_file.mtime(),
 288                            host_file.mtime(),
 289                            "guest {} mtime does not match host {} for path {:?} in project {}",
 290                            guest_user_id,
 291                            host_user_id,
 292                            guest_file.path(),
 293                            project_id,
 294                        );
 295                    }
 296                    (None, None) => {}
 297                    (None, _) => panic!("host's file is None, guest's isn't"),
 298                    (_, None) => panic!("guest's file is None, hosts's isn't"),
 299                }
 300
 301                let host_diff_base =
 302                    host_buffer.read_with(host_cx, |b, _| b.diff_base().map(ToString::to_string));
 303                let guest_diff_base = guest_buffer
 304                    .read_with(client_cx, |b, _| b.diff_base().map(ToString::to_string));
 305                assert_eq!(guest_diff_base, host_diff_base);
 306            }
 307        }
 308    }
 309
 310    for (client, mut cx) in clients {
 311        cx.update(|cx| {
 312            cx.clear_globals();
 313            drop(client);
 314        });
 315    }
 316}
 317
 318async fn apply_server_operation(
 319    deterministic: Arc<Deterministic>,
 320    server: &mut TestServer,
 321    clients: &mut Vec<(Rc<TestClient>, TestAppContext)>,
 322    client_tasks: &mut Vec<Task<()>>,
 323    operation_channels: &mut Vec<futures::channel::mpsc::UnboundedSender<usize>>,
 324    plan: Arc<Mutex<TestPlan>>,
 325    operation: Operation,
 326    cx: &mut TestAppContext,
 327) -> bool {
 328    match operation {
 329        Operation::AddConnection { user_id } => {
 330            let username;
 331            {
 332                let mut plan = plan.lock();
 333                let mut user = plan.user(user_id);
 334                if user.online {
 335                    return false;
 336                }
 337                user.online = true;
 338                username = user.username.clone();
 339            };
 340            log::info!("Adding new connection for {}", username);
 341            let next_entity_id = (user_id.0 * 10_000) as usize;
 342            let mut client_cx = TestAppContext::new(
 343                cx.foreground_platform(),
 344                cx.platform(),
 345                deterministic.build_foreground(user_id.0 as usize),
 346                deterministic.build_background(),
 347                cx.font_cache(),
 348                cx.leak_detector(),
 349                next_entity_id,
 350                cx.function_name.clone(),
 351            );
 352
 353            let (operation_tx, operation_rx) = futures::channel::mpsc::unbounded();
 354            let client = Rc::new(server.create_client(&mut client_cx, &username).await);
 355            operation_channels.push(operation_tx);
 356            clients.push((client.clone(), client_cx.clone()));
 357            client_tasks.push(client_cx.foreground().spawn(simulate_client(
 358                client,
 359                operation_rx,
 360                plan.clone(),
 361                client_cx,
 362            )));
 363
 364            log::info!("Added connection for {}", username);
 365        }
 366
 367        Operation::RemoveConnection { user_id } => {
 368            log::info!("Simulating full disconnection of user {}", user_id);
 369            let client_ix = clients
 370                .iter()
 371                .position(|(client, cx)| client.current_user_id(cx) == user_id);
 372            let Some(client_ix) = client_ix else { return false };
 373            let user_connection_ids = server
 374                .connection_pool
 375                .lock()
 376                .user_connection_ids(user_id)
 377                .collect::<Vec<_>>();
 378            assert_eq!(user_connection_ids.len(), 1);
 379            let removed_peer_id = user_connection_ids[0].into();
 380            let (client, mut client_cx) = clients.remove(client_ix);
 381            let client_task = client_tasks.remove(client_ix);
 382            operation_channels.remove(client_ix);
 383            server.forbid_connections();
 384            server.disconnect_client(removed_peer_id);
 385            deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
 386            deterministic.start_waiting();
 387            log::info!("Waiting for user {} to exit...", user_id);
 388            client_task.await;
 389            deterministic.finish_waiting();
 390            server.allow_connections();
 391
 392            for project in client.remote_projects().iter() {
 393                project.read_with(&client_cx, |project, _| {
 394                    assert!(
 395                        project.is_read_only(),
 396                        "project {:?} should be read only",
 397                        project.remote_id()
 398                    )
 399                });
 400            }
 401
 402            for (client, cx) in clients {
 403                let contacts = server
 404                    .app_state
 405                    .db
 406                    .get_contacts(client.current_user_id(cx))
 407                    .await
 408                    .unwrap();
 409                let pool = server.connection_pool.lock();
 410                for contact in contacts {
 411                    if let db::Contact::Accepted { user_id: id, .. } = contact {
 412                        if pool.is_user_online(id) {
 413                            assert_ne!(
 414                                id, user_id,
 415                                "removed client is still a contact of another peer"
 416                            );
 417                        }
 418                    }
 419                }
 420            }
 421
 422            log::info!("{} removed", client.username);
 423            plan.lock().user(user_id).online = false;
 424            client_cx.update(|cx| {
 425                cx.clear_globals();
 426                drop(client);
 427            });
 428        }
 429
 430        Operation::BounceConnection { user_id } => {
 431            log::info!("Simulating temporary disconnection of user {}", user_id);
 432            let user_connection_ids = server
 433                .connection_pool
 434                .lock()
 435                .user_connection_ids(user_id)
 436                .collect::<Vec<_>>();
 437            if user_connection_ids.is_empty() {
 438                return false;
 439            }
 440            assert_eq!(user_connection_ids.len(), 1);
 441            let peer_id = user_connection_ids[0].into();
 442            server.disconnect_client(peer_id);
 443            deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
 444        }
 445
 446        Operation::RestartServer => {
 447            log::info!("Simulating server restart");
 448            server.reset().await;
 449            deterministic.advance_clock(RECEIVE_TIMEOUT);
 450            server.start().await.unwrap();
 451            deterministic.advance_clock(CLEANUP_TIMEOUT);
 452            let environment = &server.app_state.config.zed_environment;
 453            let stale_room_ids = server
 454                .app_state
 455                .db
 456                .stale_room_ids(environment, server.id())
 457                .await
 458                .unwrap();
 459            assert_eq!(stale_room_ids, vec![]);
 460        }
 461
 462        Operation::MutateClients {
 463            user_ids,
 464            batch_id,
 465            quiesce,
 466        } => {
 467            let mut applied = false;
 468            for user_id in user_ids {
 469                let client_ix = clients
 470                    .iter()
 471                    .position(|(client, cx)| client.current_user_id(cx) == user_id);
 472                let Some(client_ix) = client_ix else { continue };
 473                applied = true;
 474                if let Err(err) = operation_channels[client_ix].unbounded_send(batch_id) {
 475                    // panic!("error signaling user {}, client {}", user_id, client_ix);
 476                }
 477            }
 478
 479            if quiesce && applied {
 480                deterministic.run_until_parked();
 481            }
 482
 483            return applied;
 484        }
 485    }
 486    true
 487}
 488
 489async fn apply_client_operation(
 490    client: &TestClient,
 491    operation: ClientOperation,
 492    cx: &mut TestAppContext,
 493) -> Result<bool> {
 494    match operation {
 495        ClientOperation::AcceptIncomingCall => {
 496            let active_call = cx.read(ActiveCall::global);
 497            if active_call.read_with(cx, |call, _| call.incoming().borrow().is_none()) {
 498                return Ok(false);
 499            }
 500
 501            log::info!("{}: accepting incoming call", client.username);
 502            active_call
 503                .update(cx, |call, cx| call.accept_incoming(cx))
 504                .await?;
 505        }
 506
 507        ClientOperation::RejectIncomingCall => {
 508            let active_call = cx.read(ActiveCall::global);
 509            if active_call.read_with(cx, |call, _| call.incoming().borrow().is_none()) {
 510                return Ok(false);
 511            }
 512
 513            log::info!("{}: declining incoming call", client.username);
 514            active_call.update(cx, |call, _| call.decline_incoming())?;
 515        }
 516
 517        ClientOperation::LeaveCall => {
 518            let active_call = cx.read(ActiveCall::global);
 519            if active_call.read_with(cx, |call, _| call.room().is_none()) {
 520                return Ok(false);
 521            }
 522
 523            log::info!("{}: hanging up", client.username);
 524            active_call.update(cx, |call, cx| call.hang_up(cx))?;
 525        }
 526
 527        ClientOperation::InviteContactToCall { user_id } => {
 528            let active_call = cx.read(ActiveCall::global);
 529
 530            log::info!("{}: inviting {}", client.username, user_id,);
 531            active_call
 532                .update(cx, |call, cx| call.invite(user_id.to_proto(), None, cx))
 533                .await
 534                .log_err();
 535        }
 536
 537        ClientOperation::OpenLocalProject { first_root_name } => {
 538            log::info!(
 539                "{}: opening local project at {:?}",
 540                client.username,
 541                first_root_name
 542            );
 543
 544            let root_path = Path::new("/").join(&first_root_name);
 545            client.fs.create_dir(&root_path).await.unwrap();
 546            client
 547                .fs
 548                .create_file(&root_path.join("main.rs"), Default::default())
 549                .await
 550                .unwrap();
 551            let project = client.build_local_project(root_path, cx).await.0;
 552            ensure_project_shared(&project, client, cx).await;
 553            client.local_projects_mut().push(project.clone());
 554        }
 555
 556        ClientOperation::AddWorktreeToProject {
 557            project_root_name,
 558            new_root_path,
 559        } => {
 560            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 561                return Ok(false)
 562            };
 563
 564            log::info!(
 565                "{}: finding/creating local worktree at {:?} to project with root path {}",
 566                client.username,
 567                new_root_path,
 568                project_root_name
 569            );
 570
 571            ensure_project_shared(&project, client, cx).await;
 572            if !client.fs.paths().await.contains(&new_root_path) {
 573                client.fs.create_dir(&new_root_path).await.unwrap();
 574            }
 575            project
 576                .update(cx, |project, cx| {
 577                    project.find_or_create_local_worktree(&new_root_path, true, cx)
 578                })
 579                .await
 580                .unwrap();
 581        }
 582
 583        ClientOperation::CloseRemoteProject { project_root_name } => {
 584            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 585                return Ok(false)
 586            };
 587
 588            log::info!(
 589                "{}: closing remote project with root path {}",
 590                client.username,
 591                project_root_name,
 592            );
 593
 594            let ix = client
 595                .remote_projects()
 596                .iter()
 597                .position(|p| p == &project)
 598                .unwrap();
 599            cx.update(|_| {
 600                client.remote_projects_mut().remove(ix);
 601                client.buffers().retain(|project, _| project != project);
 602                drop(project);
 603            });
 604        }
 605
 606        ClientOperation::OpenRemoteProject {
 607            host_id,
 608            first_root_name,
 609        } => {
 610            let active_call = cx.read(ActiveCall::global);
 611            let project = active_call.update(cx, |call, cx| {
 612                let room = call.room().cloned()?;
 613                let participant = room
 614                    .read(cx)
 615                    .remote_participants()
 616                    .get(&host_id.to_proto())?;
 617                let project_id = participant
 618                    .projects
 619                    .iter()
 620                    .find(|project| project.worktree_root_names[0] == first_root_name)?
 621                    .id;
 622                Some(room.update(cx, |room, cx| {
 623                    room.join_project(
 624                        project_id,
 625                        client.language_registry.clone(),
 626                        FakeFs::new(cx.background().clone()),
 627                        cx,
 628                    )
 629                }))
 630            });
 631            let Some(project) = project else {
 632                return Ok(false)
 633            };
 634
 635            log::info!(
 636                "{}: joining remote project of user {}, root name {}",
 637                client.username,
 638                host_id,
 639                first_root_name,
 640            );
 641
 642            let project = project.await?;
 643            client.remote_projects_mut().push(project.clone());
 644        }
 645
 646        ClientOperation::CreateWorktreeEntry {
 647            project_root_name,
 648            is_local,
 649            full_path,
 650            is_dir,
 651        } => {
 652            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 653                return Ok(false);
 654            };
 655            let Some(project_path) = project_path_for_full_path(&project, &full_path, cx) else {
 656                return Ok(false);
 657            };
 658
 659            log::info!(
 660                "{}: creating {} at path {:?} in {} project {}",
 661                client.username,
 662                if is_dir { "dir" } else { "file" },
 663                full_path,
 664                if is_local { "local" } else { "remote" },
 665                project_root_name,
 666            );
 667
 668            ensure_project_shared(&project, client, cx).await;
 669            project
 670                .update(cx, |p, cx| p.create_entry(project_path, is_dir, cx))
 671                .unwrap()
 672                .await?;
 673        }
 674
 675        ClientOperation::OpenBuffer {
 676            project_root_name,
 677            is_local,
 678            full_path,
 679        } => {
 680            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 681                return Ok(false);
 682            };
 683            let Some(project_path) = project_path_for_full_path(&project, &full_path, cx) else {
 684                return Ok(false);
 685            };
 686
 687            log::info!(
 688                "{}: opening buffer {:?} in {} project {}",
 689                client.username,
 690                full_path,
 691                if is_local { "local" } else { "remote" },
 692                project_root_name,
 693            );
 694
 695            ensure_project_shared(&project, client, cx).await;
 696            let buffer = project
 697                .update(cx, |project, cx| project.open_buffer(project_path, cx))
 698                .await?;
 699            client.buffers_for_project(&project).insert(buffer);
 700        }
 701
 702        ClientOperation::EditBuffer {
 703            project_root_name,
 704            is_local,
 705            full_path,
 706            edits,
 707        } => {
 708            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 709                return Ok(false);
 710            };
 711            let Some(buffer) =
 712                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 713                    return Ok(false);
 714                };
 715
 716            log::info!(
 717                "{}: editing buffer {:?} in {} project {} with {:?}",
 718                client.username,
 719                full_path,
 720                if is_local { "local" } else { "remote" },
 721                project_root_name,
 722                edits
 723            );
 724
 725            ensure_project_shared(&project, client, cx).await;
 726            buffer.update(cx, |buffer, cx| {
 727                let snapshot = buffer.snapshot();
 728                buffer.edit(
 729                    edits.into_iter().map(|(range, text)| {
 730                        let start = snapshot.clip_offset(range.start, Bias::Left);
 731                        let end = snapshot.clip_offset(range.end, Bias::Right);
 732                        (start..end, text)
 733                    }),
 734                    None,
 735                    cx,
 736                );
 737            });
 738        }
 739
 740        ClientOperation::CloseBuffer {
 741            project_root_name,
 742            is_local,
 743            full_path,
 744        } => {
 745            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 746                return Ok(false);
 747            };
 748            let Some(buffer) =
 749                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 750                    return Ok(false);
 751                };
 752
 753            log::info!(
 754                "{}: closing buffer {:?} in {} project {}",
 755                client.username,
 756                full_path,
 757                if is_local { "local" } else { "remote" },
 758                project_root_name
 759            );
 760
 761            ensure_project_shared(&project, client, cx).await;
 762            cx.update(|_| {
 763                client.buffers_for_project(&project).remove(&buffer);
 764                drop(buffer);
 765            });
 766        }
 767
 768        ClientOperation::SaveBuffer {
 769            project_root_name,
 770            is_local,
 771            full_path,
 772            detach,
 773        } => {
 774            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 775                return Ok(false);
 776            };
 777            let Some(buffer) =
 778                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 779                    return Ok(false);
 780                };
 781
 782            log::info!(
 783                "{}: saving buffer {:?} in {} project {}{}",
 784                client.username,
 785                full_path,
 786                if is_local { "local" } else { "remote" },
 787                project_root_name,
 788                if detach { ", detaching" } else { ", awaiting" }
 789            );
 790
 791            ensure_project_shared(&project, client, cx).await;
 792            let (requested_version, save) =
 793                buffer.update(cx, |buffer, cx| (buffer.version(), buffer.save(cx)));
 794            let save = cx.background().spawn(async move {
 795                let (saved_version, _, _) = save
 796                    .await
 797                    .map_err(|err| anyhow!("save request failed: {:?}", err))?;
 798                assert!(saved_version.observed_all(&requested_version));
 799                anyhow::Ok(())
 800            });
 801            if detach {
 802                cx.update(|cx| save.detach_and_log_err(cx));
 803            } else {
 804                save.await?;
 805            }
 806        }
 807
 808        ClientOperation::RequestLspDataInBuffer {
 809            project_root_name,
 810            is_local,
 811            full_path,
 812            offset,
 813            kind,
 814            detach,
 815        } => {
 816            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 817                return Ok(false);
 818            };
 819            let Some(buffer) =
 820                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 821                    return Ok(false);
 822                };
 823
 824            log::info!(
 825                "{}: request LSP {:?} for buffer {:?} in {} project {}{}",
 826                client.username,
 827                kind,
 828                full_path,
 829                if is_local { "local" } else { "remote" },
 830                project_root_name,
 831                if detach { ", detaching" } else { ", awaiting" }
 832            );
 833
 834            let offset = buffer.read_with(cx, |b, _| b.clip_offset(offset, Bias::Left));
 835            let request = match kind {
 836                LspRequestKind::Rename => cx.spawn(|mut cx| async move {
 837                    project
 838                        .update(&mut cx, |p, cx| p.prepare_rename(buffer, offset, cx))
 839                        .await?;
 840                    anyhow::Ok(())
 841                }),
 842                LspRequestKind::Completion => cx.spawn(|mut cx| async move {
 843                    project
 844                        .update(&mut cx, |p, cx| p.completions(&buffer, offset, cx))
 845                        .await?;
 846                    Ok(())
 847                }),
 848                LspRequestKind::CodeAction => cx.spawn(|mut cx| async move {
 849                    project
 850                        .update(&mut cx, |p, cx| p.code_actions(&buffer, offset..offset, cx))
 851                        .await?;
 852                    Ok(())
 853                }),
 854                LspRequestKind::Definition => cx.spawn(|mut cx| async move {
 855                    project
 856                        .update(&mut cx, |p, cx| p.definition(&buffer, offset, cx))
 857                        .await?;
 858                    Ok(())
 859                }),
 860                LspRequestKind::Highlights => cx.spawn(|mut cx| async move {
 861                    project
 862                        .update(&mut cx, |p, cx| p.document_highlights(&buffer, offset, cx))
 863                        .await?;
 864                    Ok(())
 865                }),
 866            };
 867            if detach {
 868                request.detach();
 869            } else {
 870                request.await?;
 871            }
 872        }
 873
 874        ClientOperation::SearchProject {
 875            project_root_name,
 876            is_local,
 877            query,
 878            detach,
 879        } => {
 880            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 881                return Ok(false);
 882            };
 883
 884            log::info!(
 885                "{}: search {} project {} for {:?}{}",
 886                client.username,
 887                if is_local { "local" } else { "remote" },
 888                project_root_name,
 889                query,
 890                if detach { ", detaching" } else { ", awaiting" }
 891            );
 892
 893            let search = project.update(cx, |project, cx| {
 894                project.search(SearchQuery::text(query, false, false), cx)
 895            });
 896            let search = cx.background().spawn(async move {
 897                search
 898                    .await
 899                    .map_err(|err| anyhow!("search request failed: {:?}", err))
 900            });
 901            if detach {
 902                cx.update(|cx| search.detach_and_log_err(cx));
 903            } else {
 904                search.await?;
 905            }
 906        }
 907
 908        ClientOperation::CreateFsEntry { path, is_dir } => {
 909            if client.fs.metadata(&path.parent().unwrap()).await?.is_none() {
 910                return Ok(false);
 911            }
 912
 913            log::info!(
 914                "{}: creating {} at {:?}",
 915                client.username,
 916                if is_dir { "dir" } else { "file" },
 917                path
 918            );
 919
 920            if is_dir {
 921                client.fs.create_dir(&path).await.unwrap();
 922            } else {
 923                client
 924                    .fs
 925                    .create_file(&path, Default::default())
 926                    .await
 927                    .unwrap();
 928            }
 929        }
 930
 931        ClientOperation::WriteGitIndex {
 932            repo_path,
 933            contents,
 934        } => {
 935            if !client
 936                .fs
 937                .metadata(&repo_path)
 938                .await?
 939                .map_or(false, |m| m.is_dir)
 940            {
 941                return Ok(false);
 942            }
 943
 944            log::info!(
 945                "{}: writing git index for repo {:?}: {:?}",
 946                client.username,
 947                repo_path,
 948                contents
 949            );
 950
 951            let dot_git_dir = repo_path.join(".git");
 952            let contents = contents
 953                .iter()
 954                .map(|(path, contents)| (path.as_path(), contents.clone()))
 955                .collect::<Vec<_>>();
 956            if client.fs.metadata(&dot_git_dir).await?.is_none() {
 957                client.fs.create_dir(&dot_git_dir).await?;
 958            }
 959            client.fs.set_index_for_repo(&dot_git_dir, &contents).await;
 960        }
 961    }
 962    Ok(true)
 963}
 964
 965struct TestPlan {
 966    rng: StdRng,
 967    replay: bool,
 968    stored_operations: Vec<(StoredOperation, Arc<AtomicBool>)>,
 969    max_operations: usize,
 970    operation_ix: usize,
 971    users: Vec<UserTestPlan>,
 972    next_batch_id: usize,
 973    allow_server_restarts: bool,
 974    allow_client_reconnection: bool,
 975    allow_client_disconnection: bool,
 976}
 977
 978struct UserTestPlan {
 979    user_id: UserId,
 980    username: String,
 981    next_root_id: usize,
 982    operation_ix: usize,
 983    online: bool,
 984}
 985
 986#[derive(Clone, Debug, Serialize, Deserialize)]
 987#[serde(untagged)]
 988enum StoredOperation {
 989    Server(Operation),
 990    Client {
 991        user_id: UserId,
 992        batch_id: usize,
 993        operation: ClientOperation,
 994    },
 995}
 996
 997#[derive(Clone, Debug, Serialize, Deserialize)]
 998enum Operation {
 999    AddConnection {
1000        user_id: UserId,
1001    },
1002    RemoveConnection {
1003        user_id: UserId,
1004    },
1005    BounceConnection {
1006        user_id: UserId,
1007    },
1008    RestartServer,
1009    MutateClients {
1010        batch_id: usize,
1011        #[serde(skip_serializing)]
1012        #[serde(skip_deserializing)]
1013        user_ids: Vec<UserId>,
1014        quiesce: bool,
1015    },
1016}
1017
1018#[derive(Clone, Debug, Serialize, Deserialize)]
1019enum ClientOperation {
1020    AcceptIncomingCall,
1021    RejectIncomingCall,
1022    LeaveCall,
1023    InviteContactToCall {
1024        user_id: UserId,
1025    },
1026    OpenLocalProject {
1027        first_root_name: String,
1028    },
1029    OpenRemoteProject {
1030        host_id: UserId,
1031        first_root_name: String,
1032    },
1033    AddWorktreeToProject {
1034        project_root_name: String,
1035        new_root_path: PathBuf,
1036    },
1037    CloseRemoteProject {
1038        project_root_name: String,
1039    },
1040    OpenBuffer {
1041        project_root_name: String,
1042        is_local: bool,
1043        full_path: PathBuf,
1044    },
1045    SearchProject {
1046        project_root_name: String,
1047        is_local: bool,
1048        query: String,
1049        detach: bool,
1050    },
1051    EditBuffer {
1052        project_root_name: String,
1053        is_local: bool,
1054        full_path: PathBuf,
1055        edits: Vec<(Range<usize>, Arc<str>)>,
1056    },
1057    CloseBuffer {
1058        project_root_name: String,
1059        is_local: bool,
1060        full_path: PathBuf,
1061    },
1062    SaveBuffer {
1063        project_root_name: String,
1064        is_local: bool,
1065        full_path: PathBuf,
1066        detach: bool,
1067    },
1068    RequestLspDataInBuffer {
1069        project_root_name: String,
1070        is_local: bool,
1071        full_path: PathBuf,
1072        offset: usize,
1073        kind: LspRequestKind,
1074        detach: bool,
1075    },
1076    CreateWorktreeEntry {
1077        project_root_name: String,
1078        is_local: bool,
1079        full_path: PathBuf,
1080        is_dir: bool,
1081    },
1082    CreateFsEntry {
1083        path: PathBuf,
1084        is_dir: bool,
1085    },
1086    WriteGitIndex {
1087        repo_path: PathBuf,
1088        contents: Vec<(PathBuf, String)>,
1089    },
1090}
1091
1092#[derive(Clone, Debug, Serialize, Deserialize)]
1093enum LspRequestKind {
1094    Rename,
1095    Completion,
1096    CodeAction,
1097    Definition,
1098    Highlights,
1099}
1100
1101impl TestPlan {
1102    fn new(mut rng: StdRng, users: Vec<UserTestPlan>, max_operations: usize) -> Self {
1103        Self {
1104            replay: false,
1105            allow_server_restarts: rng.gen_bool(0.7),
1106            allow_client_reconnection: rng.gen_bool(0.7),
1107            allow_client_disconnection: rng.gen_bool(0.1),
1108            stored_operations: Vec::new(),
1109            operation_ix: 0,
1110            next_batch_id: 0,
1111            max_operations,
1112            users,
1113            rng,
1114        }
1115    }
1116
1117    fn load(&mut self, path: &Path) {
1118        let json = std::fs::read_to_string(path).unwrap();
1119        self.replay = true;
1120        let stored_operations: Vec<StoredOperation> = serde_json::from_str(&json).unwrap();
1121        self.stored_operations = stored_operations
1122            .iter()
1123            .cloned()
1124            .enumerate()
1125            .map(|(i, mut operation)| {
1126                if let StoredOperation::Server(Operation::MutateClients {
1127                    batch_id: current_batch_id,
1128                    user_ids,
1129                    ..
1130                }) = &mut operation
1131                {
1132                    assert!(user_ids.is_empty());
1133                    user_ids.extend(stored_operations[i + 1..].iter().filter_map(|operation| {
1134                        if let StoredOperation::Client {
1135                            user_id, batch_id, ..
1136                        } = operation
1137                        {
1138                            if batch_id == current_batch_id {
1139                                return Some(user_id);
1140                            }
1141                        }
1142                        None
1143                    }));
1144                    user_ids.sort_unstable();
1145                }
1146                (operation, Arc::new(AtomicBool::new(false)))
1147            })
1148            .collect()
1149    }
1150
1151    fn save(&mut self, path: &Path) {
1152        // Format each operation as one line
1153        let mut json = Vec::new();
1154        json.push(b'[');
1155        for (operation, skipped) in &self.stored_operations {
1156            if skipped.load(SeqCst) {
1157                continue;
1158            }
1159            if json.len() > 1 {
1160                json.push(b',');
1161            }
1162            json.extend_from_slice(b"\n  ");
1163            serde_json::to_writer(&mut json, operation).unwrap();
1164        }
1165        json.extend_from_slice(b"\n]\n");
1166        std::fs::write(path, &json).unwrap();
1167    }
1168
1169    fn next_server_operation(
1170        &mut self,
1171        clients: &[(Rc<TestClient>, TestAppContext)],
1172    ) -> Option<(Operation, Arc<AtomicBool>)> {
1173        if self.replay {
1174            while let Some(stored_operation) = self.stored_operations.get(self.operation_ix) {
1175                self.operation_ix += 1;
1176                if let (StoredOperation::Server(operation), skipped) = stored_operation {
1177                    return Some((operation.clone(), skipped.clone()));
1178                }
1179            }
1180            None
1181        } else {
1182            let operation = self.generate_server_operation(clients)?;
1183            let skipped = Arc::new(AtomicBool::new(false));
1184            self.stored_operations
1185                .push((StoredOperation::Server(operation.clone()), skipped.clone()));
1186            Some((operation, skipped))
1187        }
1188    }
1189
1190    fn next_client_operation(
1191        &mut self,
1192        client: &TestClient,
1193        current_batch_id: usize,
1194        cx: &TestAppContext,
1195    ) -> Option<(ClientOperation, Arc<AtomicBool>)> {
1196        let current_user_id = client.current_user_id(cx);
1197        let user_ix = self
1198            .users
1199            .iter()
1200            .position(|user| user.user_id == current_user_id)
1201            .unwrap();
1202        let user_plan = &mut self.users[user_ix];
1203
1204        if self.replay {
1205            while let Some(stored_operation) = self.stored_operations.get(user_plan.operation_ix) {
1206                user_plan.operation_ix += 1;
1207                if let (
1208                    StoredOperation::Client {
1209                        user_id, operation, ..
1210                    },
1211                    skipped,
1212                ) = stored_operation
1213                {
1214                    if user_id == &current_user_id {
1215                        return Some((operation.clone(), skipped.clone()));
1216                    }
1217                }
1218            }
1219            None
1220        } else {
1221            let operation = self.generate_client_operation(current_user_id, client, cx)?;
1222            let skipped = Arc::new(AtomicBool::new(false));
1223            self.stored_operations.push((
1224                StoredOperation::Client {
1225                    user_id: current_user_id,
1226                    batch_id: current_batch_id,
1227                    operation: operation.clone(),
1228                },
1229                skipped.clone(),
1230            ));
1231            Some((operation, skipped))
1232        }
1233    }
1234
1235    fn generate_server_operation(
1236        &mut self,
1237        clients: &[(Rc<TestClient>, TestAppContext)],
1238    ) -> Option<Operation> {
1239        if self.operation_ix == self.max_operations {
1240            return None;
1241        }
1242
1243        Some(loop {
1244            break match self.rng.gen_range(0..100) {
1245                0..=29 if clients.len() < self.users.len() => {
1246                    let user = self
1247                        .users
1248                        .iter()
1249                        .filter(|u| !u.online)
1250                        .choose(&mut self.rng)
1251                        .unwrap();
1252                    self.operation_ix += 1;
1253                    Operation::AddConnection {
1254                        user_id: user.user_id,
1255                    }
1256                }
1257                30..=34 if clients.len() > 1 && self.allow_client_disconnection => {
1258                    let (client, cx) = &clients[self.rng.gen_range(0..clients.len())];
1259                    let user_id = client.current_user_id(cx);
1260                    self.operation_ix += 1;
1261                    Operation::RemoveConnection { user_id }
1262                }
1263                35..=39 if clients.len() > 1 && self.allow_client_reconnection => {
1264                    let (client, cx) = &clients[self.rng.gen_range(0..clients.len())];
1265                    let user_id = client.current_user_id(cx);
1266                    self.operation_ix += 1;
1267                    Operation::BounceConnection { user_id }
1268                }
1269                40..=44 if self.allow_server_restarts && clients.len() > 1 => {
1270                    self.operation_ix += 1;
1271                    Operation::RestartServer
1272                }
1273                _ if !clients.is_empty() => {
1274                    let count = self
1275                        .rng
1276                        .gen_range(1..10)
1277                        .min(self.max_operations - self.operation_ix);
1278                    let batch_id = util::post_inc(&mut self.next_batch_id);
1279                    let mut user_ids = (0..count)
1280                        .map(|_| {
1281                            let ix = self.rng.gen_range(0..clients.len());
1282                            let (client, cx) = &clients[ix];
1283                            client.current_user_id(cx)
1284                        })
1285                        .collect::<Vec<_>>();
1286                    user_ids.sort_unstable();
1287                    Operation::MutateClients {
1288                        user_ids,
1289                        batch_id,
1290                        quiesce: self.rng.gen_bool(0.7),
1291                    }
1292                }
1293                _ => continue,
1294            };
1295        })
1296    }
1297
1298    fn generate_client_operation(
1299        &mut self,
1300        user_id: UserId,
1301        client: &TestClient,
1302        cx: &TestAppContext,
1303    ) -> Option<ClientOperation> {
1304        if self.operation_ix == self.max_operations {
1305            return None;
1306        }
1307
1308        let executor = cx.background();
1309        self.operation_ix += 1;
1310        let call = cx.read(ActiveCall::global);
1311        Some(loop {
1312            match self.rng.gen_range(0..100_u32) {
1313                // Mutate the call
1314                0..=29 => {
1315                    // Respond to an incoming call
1316                    if call.read_with(cx, |call, _| call.incoming().borrow().is_some()) {
1317                        break if self.rng.gen_bool(0.7) {
1318                            ClientOperation::AcceptIncomingCall
1319                        } else {
1320                            ClientOperation::RejectIncomingCall
1321                        };
1322                    }
1323
1324                    match self.rng.gen_range(0..100_u32) {
1325                        // Invite a contact to the current call
1326                        0..=70 => {
1327                            let available_contacts =
1328                                client.user_store.read_with(cx, |user_store, _| {
1329                                    user_store
1330                                        .contacts()
1331                                        .iter()
1332                                        .filter(|contact| contact.online && !contact.busy)
1333                                        .cloned()
1334                                        .collect::<Vec<_>>()
1335                                });
1336                            if !available_contacts.is_empty() {
1337                                let contact = available_contacts.choose(&mut self.rng).unwrap();
1338                                break ClientOperation::InviteContactToCall {
1339                                    user_id: UserId(contact.user.id as i32),
1340                                };
1341                            }
1342                        }
1343
1344                        // Leave the current call
1345                        71.. => {
1346                            if self.allow_client_disconnection
1347                                && call.read_with(cx, |call, _| call.room().is_some())
1348                            {
1349                                break ClientOperation::LeaveCall;
1350                            }
1351                        }
1352                    }
1353                }
1354
1355                // Mutate projects
1356                30..=59 => match self.rng.gen_range(0..100_u32) {
1357                    // Open a new project
1358                    0..=70 => {
1359                        // Open a remote project
1360                        if let Some(room) = call.read_with(cx, |call, _| call.room().cloned()) {
1361                            let existing_remote_project_ids = cx.read(|cx| {
1362                                client
1363                                    .remote_projects()
1364                                    .iter()
1365                                    .map(|p| p.read(cx).remote_id().unwrap())
1366                                    .collect::<Vec<_>>()
1367                            });
1368                            let new_remote_projects = room.read_with(cx, |room, _| {
1369                                room.remote_participants()
1370                                    .values()
1371                                    .flat_map(|participant| {
1372                                        participant.projects.iter().filter_map(|project| {
1373                                            if existing_remote_project_ids.contains(&project.id) {
1374                                                None
1375                                            } else {
1376                                                Some((
1377                                                    UserId::from_proto(participant.user.id),
1378                                                    project.worktree_root_names[0].clone(),
1379                                                ))
1380                                            }
1381                                        })
1382                                    })
1383                                    .collect::<Vec<_>>()
1384                            });
1385                            if !new_remote_projects.is_empty() {
1386                                let (host_id, first_root_name) =
1387                                    new_remote_projects.choose(&mut self.rng).unwrap().clone();
1388                                break ClientOperation::OpenRemoteProject {
1389                                    host_id,
1390                                    first_root_name,
1391                                };
1392                            }
1393                        }
1394                        // Open a local project
1395                        else {
1396                            let first_root_name = self.next_root_dir_name(user_id);
1397                            break ClientOperation::OpenLocalProject { first_root_name };
1398                        }
1399                    }
1400
1401                    // Close a remote project
1402                    71..=80 => {
1403                        if !client.remote_projects().is_empty() {
1404                            let project = client
1405                                .remote_projects()
1406                                .choose(&mut self.rng)
1407                                .unwrap()
1408                                .clone();
1409                            let first_root_name = root_name_for_project(&project, cx);
1410                            break ClientOperation::CloseRemoteProject {
1411                                project_root_name: first_root_name,
1412                            };
1413                        }
1414                    }
1415
1416                    // Mutate project worktrees
1417                    81.. => match self.rng.gen_range(0..100_u32) {
1418                        // Add a worktree to a local project
1419                        0..=50 => {
1420                            let Some(project) = client
1421                                .local_projects()
1422                                .choose(&mut self.rng)
1423                                .cloned() else { continue };
1424                            let project_root_name = root_name_for_project(&project, cx);
1425                            let mut paths = executor.block(client.fs.paths());
1426                            paths.remove(0);
1427                            let new_root_path = if paths.is_empty() || self.rng.gen() {
1428                                Path::new("/").join(&self.next_root_dir_name(user_id))
1429                            } else {
1430                                paths.choose(&mut self.rng).unwrap().clone()
1431                            };
1432                            break ClientOperation::AddWorktreeToProject {
1433                                project_root_name,
1434                                new_root_path,
1435                            };
1436                        }
1437
1438                        // Add an entry to a worktree
1439                        _ => {
1440                            let Some(project) = choose_random_project(client, &mut self.rng) else { continue };
1441                            let project_root_name = root_name_for_project(&project, cx);
1442                            let is_local = project.read_with(cx, |project, _| project.is_local());
1443                            let worktree = project.read_with(cx, |project, cx| {
1444                                project
1445                                    .worktrees(cx)
1446                                    .filter(|worktree| {
1447                                        let worktree = worktree.read(cx);
1448                                        worktree.is_visible()
1449                                            && worktree.entries(false).any(|e| e.is_file())
1450                                            && worktree.root_entry().map_or(false, |e| e.is_dir())
1451                                    })
1452                                    .choose(&mut self.rng)
1453                            });
1454                            let Some(worktree) = worktree else { continue };
1455                            let is_dir = self.rng.gen::<bool>();
1456                            let mut full_path =
1457                                worktree.read_with(cx, |w, _| PathBuf::from(w.root_name()));
1458                            full_path.push(gen_file_name(&mut self.rng));
1459                            if !is_dir {
1460                                full_path.set_extension("rs");
1461                            }
1462                            break ClientOperation::CreateWorktreeEntry {
1463                                project_root_name,
1464                                is_local,
1465                                full_path,
1466                                is_dir,
1467                            };
1468                        }
1469                    },
1470                },
1471
1472                // Query and mutate buffers
1473                60..=90 => {
1474                    let Some(project) = choose_random_project(client, &mut self.rng) else { continue };
1475                    let project_root_name = root_name_for_project(&project, cx);
1476                    let is_local = project.read_with(cx, |project, _| project.is_local());
1477
1478                    match self.rng.gen_range(0..100_u32) {
1479                        // Manipulate an existing buffer
1480                        0..=70 => {
1481                            let Some(buffer) = client
1482                                .buffers_for_project(&project)
1483                                .iter()
1484                                .choose(&mut self.rng)
1485                                .cloned() else { continue };
1486
1487                            let full_path = buffer
1488                                .read_with(cx, |buffer, cx| buffer.file().unwrap().full_path(cx));
1489
1490                            match self.rng.gen_range(0..100_u32) {
1491                                // Close the buffer
1492                                0..=15 => {
1493                                    break ClientOperation::CloseBuffer {
1494                                        project_root_name,
1495                                        is_local,
1496                                        full_path,
1497                                    };
1498                                }
1499                                // Save the buffer
1500                                16..=29 if buffer.read_with(cx, |b, _| b.is_dirty()) => {
1501                                    let detach = self.rng.gen_bool(0.3);
1502                                    break ClientOperation::SaveBuffer {
1503                                        project_root_name,
1504                                        is_local,
1505                                        full_path,
1506                                        detach,
1507                                    };
1508                                }
1509                                // Edit the buffer
1510                                30..=69 => {
1511                                    let edits = buffer.read_with(cx, |buffer, _| {
1512                                        buffer.get_random_edits(&mut self.rng, 3)
1513                                    });
1514                                    break ClientOperation::EditBuffer {
1515                                        project_root_name,
1516                                        is_local,
1517                                        full_path,
1518                                        edits,
1519                                    };
1520                                }
1521                                // Make an LSP request
1522                                _ => {
1523                                    let offset = buffer.read_with(cx, |buffer, _| {
1524                                        buffer.clip_offset(
1525                                            self.rng.gen_range(0..=buffer.len()),
1526                                            language::Bias::Left,
1527                                        )
1528                                    });
1529                                    let detach = self.rng.gen();
1530                                    break ClientOperation::RequestLspDataInBuffer {
1531                                        project_root_name,
1532                                        full_path,
1533                                        offset,
1534                                        is_local,
1535                                        kind: match self.rng.gen_range(0..5_u32) {
1536                                            0 => LspRequestKind::Rename,
1537                                            1 => LspRequestKind::Highlights,
1538                                            2 => LspRequestKind::Definition,
1539                                            3 => LspRequestKind::CodeAction,
1540                                            4.. => LspRequestKind::Completion,
1541                                        },
1542                                        detach,
1543                                    };
1544                                }
1545                            }
1546                        }
1547
1548                        71..=80 => {
1549                            let query = self.rng.gen_range('a'..='z').to_string();
1550                            let detach = self.rng.gen_bool(0.3);
1551                            break ClientOperation::SearchProject {
1552                                project_root_name,
1553                                is_local,
1554                                query,
1555                                detach,
1556                            };
1557                        }
1558
1559                        // Open a buffer
1560                        81.. => {
1561                            let worktree = project.read_with(cx, |project, cx| {
1562                                project
1563                                    .worktrees(cx)
1564                                    .filter(|worktree| {
1565                                        let worktree = worktree.read(cx);
1566                                        worktree.is_visible()
1567                                            && worktree.entries(false).any(|e| e.is_file())
1568                                    })
1569                                    .choose(&mut self.rng)
1570                            });
1571                            let Some(worktree) = worktree else { continue };
1572                            let full_path = worktree.read_with(cx, |worktree, _| {
1573                                let entry = worktree
1574                                    .entries(false)
1575                                    .filter(|e| e.is_file())
1576                                    .choose(&mut self.rng)
1577                                    .unwrap();
1578                                if entry.path.as_ref() == Path::new("") {
1579                                    Path::new(worktree.root_name()).into()
1580                                } else {
1581                                    Path::new(worktree.root_name()).join(&entry.path)
1582                                }
1583                            });
1584                            break ClientOperation::OpenBuffer {
1585                                project_root_name,
1586                                is_local,
1587                                full_path,
1588                            };
1589                        }
1590                    }
1591                }
1592
1593                // Update a git index
1594                91..=95 => {
1595                    let repo_path = executor
1596                        .block(client.fs.directories())
1597                        .choose(&mut self.rng)
1598                        .unwrap()
1599                        .clone();
1600
1601                    let mut file_paths = executor
1602                        .block(client.fs.files())
1603                        .into_iter()
1604                        .filter(|path| path.starts_with(&repo_path))
1605                        .collect::<Vec<_>>();
1606                    let count = self.rng.gen_range(0..=file_paths.len());
1607                    file_paths.shuffle(&mut self.rng);
1608                    file_paths.truncate(count);
1609
1610                    let mut contents = Vec::new();
1611                    for abs_child_file_path in &file_paths {
1612                        let child_file_path = abs_child_file_path
1613                            .strip_prefix(&repo_path)
1614                            .unwrap()
1615                            .to_path_buf();
1616                        let new_base = Alphanumeric.sample_string(&mut self.rng, 16);
1617                        contents.push((child_file_path, new_base));
1618                    }
1619
1620                    break ClientOperation::WriteGitIndex {
1621                        repo_path,
1622                        contents,
1623                    };
1624                }
1625
1626                // Create a file or directory
1627                96.. => {
1628                    let is_dir = self.rng.gen::<bool>();
1629                    let mut path = cx
1630                        .background()
1631                        .block(client.fs.directories())
1632                        .choose(&mut self.rng)
1633                        .unwrap()
1634                        .clone();
1635                    path.push(gen_file_name(&mut self.rng));
1636                    if !is_dir {
1637                        path.set_extension("rs");
1638                    }
1639                    break ClientOperation::CreateFsEntry { path, is_dir };
1640                }
1641            }
1642        })
1643    }
1644
1645    fn next_root_dir_name(&mut self, user_id: UserId) -> String {
1646        let user_ix = self
1647            .users
1648            .iter()
1649            .position(|user| user.user_id == user_id)
1650            .unwrap();
1651        let root_id = util::post_inc(&mut self.users[user_ix].next_root_id);
1652        format!("dir-{user_id}-{root_id}")
1653    }
1654
1655    fn user(&mut self, user_id: UserId) -> &mut UserTestPlan {
1656        let ix = self
1657            .users
1658            .iter()
1659            .position(|user| user.user_id == user_id)
1660            .unwrap();
1661        &mut self.users[ix]
1662    }
1663}
1664
1665async fn simulate_client(
1666    client: Rc<TestClient>,
1667    mut operation_rx: futures::channel::mpsc::UnboundedReceiver<usize>,
1668    plan: Arc<Mutex<TestPlan>>,
1669    mut cx: TestAppContext,
1670) {
1671    // Setup language server
1672    let mut language = Language::new(
1673        LanguageConfig {
1674            name: "Rust".into(),
1675            path_suffixes: vec!["rs".to_string()],
1676            ..Default::default()
1677        },
1678        None,
1679    );
1680    let _fake_language_servers = language
1681        .set_fake_lsp_adapter(Arc::new(FakeLspAdapter {
1682            name: "the-fake-language-server",
1683            capabilities: lsp::LanguageServer::full_capabilities(),
1684            initializer: Some(Box::new({
1685                let plan = plan.clone();
1686                let fs = client.fs.clone();
1687                move |fake_server: &mut FakeLanguageServer| {
1688                    fake_server.handle_request::<lsp::request::Completion, _, _>(
1689                        |_, _| async move {
1690                            Ok(Some(lsp::CompletionResponse::Array(vec![
1691                                lsp::CompletionItem {
1692                                    text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
1693                                        range: lsp::Range::new(
1694                                            lsp::Position::new(0, 0),
1695                                            lsp::Position::new(0, 0),
1696                                        ),
1697                                        new_text: "the-new-text".to_string(),
1698                                    })),
1699                                    ..Default::default()
1700                                },
1701                            ])))
1702                        },
1703                    );
1704
1705                    fake_server.handle_request::<lsp::request::CodeActionRequest, _, _>(
1706                        |_, _| async move {
1707                            Ok(Some(vec![lsp::CodeActionOrCommand::CodeAction(
1708                                lsp::CodeAction {
1709                                    title: "the-code-action".to_string(),
1710                                    ..Default::default()
1711                                },
1712                            )]))
1713                        },
1714                    );
1715
1716                    fake_server.handle_request::<lsp::request::PrepareRenameRequest, _, _>(
1717                        |params, _| async move {
1718                            Ok(Some(lsp::PrepareRenameResponse::Range(lsp::Range::new(
1719                                params.position,
1720                                params.position,
1721                            ))))
1722                        },
1723                    );
1724
1725                    fake_server.handle_request::<lsp::request::GotoDefinition, _, _>({
1726                        let fs = fs.clone();
1727                        let plan = plan.clone();
1728                        move |_, _| {
1729                            let fs = fs.clone();
1730                            let plan = plan.clone();
1731                            async move {
1732                                let files = fs.files().await;
1733                                let count = plan.lock().rng.gen_range::<usize, _>(1..3);
1734                                let files = (0..count)
1735                                    .map(|_| files.choose(&mut plan.lock().rng).unwrap())
1736                                    .collect::<Vec<_>>();
1737                                log::info!("LSP: Returning definitions in files {:?}", &files);
1738                                Ok(Some(lsp::GotoDefinitionResponse::Array(
1739                                    files
1740                                        .into_iter()
1741                                        .map(|file| lsp::Location {
1742                                            uri: lsp::Url::from_file_path(file).unwrap(),
1743                                            range: Default::default(),
1744                                        })
1745                                        .collect(),
1746                                )))
1747                            }
1748                        }
1749                    });
1750
1751                    fake_server.handle_request::<lsp::request::DocumentHighlightRequest, _, _>({
1752                        let plan = plan.clone();
1753                        move |_, _| {
1754                            let mut highlights = Vec::new();
1755                            let highlight_count = plan.lock().rng.gen_range(1..=5);
1756                            for _ in 0..highlight_count {
1757                                let start_row = plan.lock().rng.gen_range(0..100);
1758                                let start_column = plan.lock().rng.gen_range(0..100);
1759                                let start = PointUtf16::new(start_row, start_column);
1760                                let end_row = plan.lock().rng.gen_range(0..100);
1761                                let end_column = plan.lock().rng.gen_range(0..100);
1762                                let end = PointUtf16::new(end_row, end_column);
1763                                let range = if start > end { end..start } else { start..end };
1764                                highlights.push(lsp::DocumentHighlight {
1765                                    range: range_to_lsp(range.clone()),
1766                                    kind: Some(lsp::DocumentHighlightKind::READ),
1767                                });
1768                            }
1769                            highlights.sort_unstable_by_key(|highlight| {
1770                                (highlight.range.start, highlight.range.end)
1771                            });
1772                            async move { Ok(Some(highlights)) }
1773                        }
1774                    });
1775                }
1776            })),
1777            ..Default::default()
1778        }))
1779        .await;
1780    client.language_registry.add(Arc::new(language));
1781
1782    while let Some(batch_id) = operation_rx.next().await {
1783        let Some((operation, skipped)) = plan.lock().next_client_operation(&client, batch_id, &cx) else { break };
1784        match apply_client_operation(&client, operation, &mut cx).await {
1785            Err(error) => {
1786                log::error!("{} error: {}", client.username, error);
1787            }
1788            Ok(applied) => {
1789                if !applied {
1790                    skipped.store(true, SeqCst);
1791                }
1792            }
1793        }
1794        cx.background().simulate_random_delay().await;
1795    }
1796    log::info!("{}: done", client.username);
1797}
1798
1799fn buffer_for_full_path(
1800    buffers: &HashSet<ModelHandle<language::Buffer>>,
1801    full_path: &PathBuf,
1802    cx: &TestAppContext,
1803) -> Option<ModelHandle<language::Buffer>> {
1804    buffers
1805        .iter()
1806        .find(|buffer| {
1807            buffer.read_with(cx, |buffer, cx| {
1808                buffer.file().unwrap().full_path(cx) == *full_path
1809            })
1810        })
1811        .cloned()
1812}
1813
1814fn project_for_root_name(
1815    client: &TestClient,
1816    root_name: &str,
1817    cx: &TestAppContext,
1818) -> Option<ModelHandle<Project>> {
1819    if let Some(ix) = project_ix_for_root_name(&*client.local_projects(), root_name, cx) {
1820        return Some(client.local_projects()[ix].clone());
1821    }
1822    if let Some(ix) = project_ix_for_root_name(&*client.remote_projects(), root_name, cx) {
1823        return Some(client.remote_projects()[ix].clone());
1824    }
1825    None
1826}
1827
1828fn project_ix_for_root_name(
1829    projects: &[ModelHandle<Project>],
1830    root_name: &str,
1831    cx: &TestAppContext,
1832) -> Option<usize> {
1833    projects.iter().position(|project| {
1834        project.read_with(cx, |project, cx| {
1835            let worktree = project.visible_worktrees(cx).next().unwrap();
1836            worktree.read(cx).root_name() == root_name
1837        })
1838    })
1839}
1840
1841fn root_name_for_project(project: &ModelHandle<Project>, cx: &TestAppContext) -> String {
1842    project.read_with(cx, |project, cx| {
1843        project
1844            .visible_worktrees(cx)
1845            .next()
1846            .unwrap()
1847            .read(cx)
1848            .root_name()
1849            .to_string()
1850    })
1851}
1852
1853fn project_path_for_full_path(
1854    project: &ModelHandle<Project>,
1855    full_path: &Path,
1856    cx: &TestAppContext,
1857) -> Option<ProjectPath> {
1858    let mut components = full_path.components();
1859    let root_name = components.next().unwrap().as_os_str().to_str().unwrap();
1860    let path = components.as_path().into();
1861    let worktree_id = project.read_with(cx, |project, cx| {
1862        project.worktrees(cx).find_map(|worktree| {
1863            let worktree = worktree.read(cx);
1864            if worktree.root_name() == root_name {
1865                Some(worktree.id())
1866            } else {
1867                None
1868            }
1869        })
1870    })?;
1871    Some(ProjectPath { worktree_id, path })
1872}
1873
1874async fn ensure_project_shared(
1875    project: &ModelHandle<Project>,
1876    client: &TestClient,
1877    cx: &mut TestAppContext,
1878) {
1879    let first_root_name = root_name_for_project(project, cx);
1880    let active_call = cx.read(ActiveCall::global);
1881    if active_call.read_with(cx, |call, _| call.room().is_some())
1882        && project.read_with(cx, |project, _| project.is_local() && !project.is_shared())
1883    {
1884        match active_call
1885            .update(cx, |call, cx| call.share_project(project.clone(), cx))
1886            .await
1887        {
1888            Ok(project_id) => {
1889                log::info!(
1890                    "{}: shared project {} with id {}",
1891                    client.username,
1892                    first_root_name,
1893                    project_id
1894                );
1895            }
1896            Err(error) => {
1897                log::error!(
1898                    "{}: error sharing project {}: {:?}",
1899                    client.username,
1900                    first_root_name,
1901                    error
1902                );
1903            }
1904        }
1905    }
1906}
1907
1908fn choose_random_project(client: &TestClient, rng: &mut StdRng) -> Option<ModelHandle<Project>> {
1909    client
1910        .local_projects()
1911        .iter()
1912        .chain(client.remote_projects().iter())
1913        .choose(rng)
1914        .cloned()
1915}
1916
1917fn gen_file_name(rng: &mut StdRng) -> String {
1918    let mut name = String::new();
1919    for _ in 0..10 {
1920        let letter = rng.gen_range('a'..='z');
1921        name.push(letter);
1922    }
1923    name
1924}
1925
1926fn path_env_var(name: &str) -> Option<PathBuf> {
1927    let value = env::var(name).ok()?;
1928    let mut path = PathBuf::from(value);
1929    if path.is_relative() {
1930        let mut abs_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
1931        abs_path.pop();
1932        abs_path.pop();
1933        abs_path.push(path);
1934        path = abs_path
1935    }
1936    Some(path)
1937}