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    let mut next_entity_id = 100000;
 109
 110    loop {
 111        let Some((next_operation, skipped)) = plan.lock().next_server_operation(&clients) else { break };
 112        let applied = apply_server_operation(
 113            deterministic.clone(),
 114            &mut server,
 115            &mut clients,
 116            &mut client_tasks,
 117            &mut operation_channels,
 118            &mut next_entity_id,
 119            plan.clone(),
 120            next_operation,
 121            cx,
 122        )
 123        .await;
 124        if !applied {
 125            skipped.store(false, SeqCst);
 126        }
 127    }
 128
 129    drop(operation_channels);
 130    deterministic.start_waiting();
 131    futures::future::join_all(client_tasks).await;
 132    deterministic.finish_waiting();
 133    deterministic.run_until_parked();
 134
 135    if let Some(path) = &plan_save_path {
 136        eprintln!("saved test plan to path {:?}", path);
 137        plan.lock().save(path);
 138    }
 139
 140    for (client, client_cx) in &clients {
 141        for guest_project in client.remote_projects().iter() {
 142            guest_project.read_with(client_cx, |guest_project, cx| {
 143                let host_project = clients.iter().find_map(|(client, cx)| {
 144                    let project = client
 145                        .local_projects()
 146                        .iter()
 147                        .find(|host_project| {
 148                            host_project.read_with(cx, |host_project, _| {
 149                                host_project.remote_id() == guest_project.remote_id()
 150                            })
 151                        })?
 152                        .clone();
 153                    Some((project, cx))
 154                });
 155
 156                if !guest_project.is_read_only() {
 157                    if let Some((host_project, host_cx)) = host_project {
 158                        let host_worktree_snapshots =
 159                            host_project.read_with(host_cx, |host_project, cx| {
 160                                host_project
 161                                    .worktrees(cx)
 162                                    .map(|worktree| {
 163                                        let worktree = worktree.read(cx);
 164                                        (worktree.id(), worktree.snapshot())
 165                                    })
 166                                    .collect::<BTreeMap<_, _>>()
 167                            });
 168                        let guest_worktree_snapshots = guest_project
 169                            .worktrees(cx)
 170                            .map(|worktree| {
 171                                let worktree = worktree.read(cx);
 172                                (worktree.id(), worktree.snapshot())
 173                            })
 174                            .collect::<BTreeMap<_, _>>();
 175
 176                        assert_eq!(
 177                            guest_worktree_snapshots.keys().collect::<Vec<_>>(),
 178                            host_worktree_snapshots.keys().collect::<Vec<_>>(),
 179                            "{} has different worktrees than the host",
 180                            client.username
 181                        );
 182
 183                        for (id, host_snapshot) in &host_worktree_snapshots {
 184                            let guest_snapshot = &guest_worktree_snapshots[id];
 185                            assert_eq!(
 186                                guest_snapshot.root_name(),
 187                                host_snapshot.root_name(),
 188                                "{} has different root name than the host for worktree {}",
 189                                client.username,
 190                                id
 191                            );
 192                            assert_eq!(
 193                                guest_snapshot.abs_path(),
 194                                host_snapshot.abs_path(),
 195                                "{} has different abs path than the host for worktree {}",
 196                                client.username,
 197                                id
 198                            );
 199                            assert_eq!(
 200                                guest_snapshot.entries(false).collect::<Vec<_>>(),
 201                                host_snapshot.entries(false).collect::<Vec<_>>(),
 202                                "{} has different snapshot than the host for worktree {} ({:?}) and project {:?}",
 203                                client.username,
 204                                id,
 205                                host_snapshot.abs_path(),
 206                                host_project.read_with(host_cx, |project, _| project.remote_id())
 207                            );
 208                            assert_eq!(guest_snapshot.scan_id(), host_snapshot.scan_id());
 209                        }
 210                    }
 211                }
 212
 213                guest_project.check_invariants(cx);
 214            });
 215        }
 216
 217        let buffers = client.buffers().clone();
 218        for (guest_project, guest_buffers) in &buffers {
 219            let project_id = if guest_project.read_with(client_cx, |project, _| {
 220                project.is_local() || project.is_read_only()
 221            }) {
 222                continue;
 223            } else {
 224                guest_project
 225                    .read_with(client_cx, |project, _| project.remote_id())
 226                    .unwrap()
 227            };
 228            let guest_user_id = client.user_id().unwrap();
 229
 230            let host_project = clients.iter().find_map(|(client, cx)| {
 231                let project = client
 232                    .local_projects()
 233                    .iter()
 234                    .find(|host_project| {
 235                        host_project.read_with(cx, |host_project, _| {
 236                            host_project.remote_id() == Some(project_id)
 237                        })
 238                    })?
 239                    .clone();
 240                Some((client.user_id().unwrap(), project, cx))
 241            });
 242
 243            let (host_user_id, host_project, host_cx) =
 244                if let Some((host_user_id, host_project, host_cx)) = host_project {
 245                    (host_user_id, host_project, host_cx)
 246                } else {
 247                    continue;
 248                };
 249
 250            for guest_buffer in guest_buffers {
 251                let buffer_id = guest_buffer.read_with(client_cx, |buffer, _| buffer.remote_id());
 252                let host_buffer = host_project.read_with(host_cx, |project, cx| {
 253                    project.buffer_for_id(buffer_id, cx).unwrap_or_else(|| {
 254                        panic!(
 255                            "host does not have buffer for guest:{}, peer:{:?}, id:{}",
 256                            client.username,
 257                            client.peer_id(),
 258                            buffer_id
 259                        )
 260                    })
 261                });
 262                let path = host_buffer
 263                    .read_with(host_cx, |buffer, cx| buffer.file().unwrap().full_path(cx));
 264
 265                assert_eq!(
 266                    guest_buffer.read_with(client_cx, |buffer, _| buffer.deferred_ops_len()),
 267                    0,
 268                    "{}, buffer {}, path {:?} has deferred operations",
 269                    client.username,
 270                    buffer_id,
 271                    path,
 272                );
 273                assert_eq!(
 274                    guest_buffer.read_with(client_cx, |buffer, _| buffer.text()),
 275                    host_buffer.read_with(host_cx, |buffer, _| buffer.text()),
 276                    "{}, buffer {}, path {:?}, differs from the host's buffer",
 277                    client.username,
 278                    buffer_id,
 279                    path
 280                );
 281
 282                let host_file = host_buffer.read_with(host_cx, |b, _| b.file().cloned());
 283                let guest_file = guest_buffer.read_with(client_cx, |b, _| b.file().cloned());
 284                match (host_file, guest_file) {
 285                    (Some(host_file), Some(guest_file)) => {
 286                        assert_eq!(guest_file.path(), host_file.path());
 287                        assert_eq!(guest_file.is_deleted(), host_file.is_deleted());
 288                        assert_eq!(
 289                            guest_file.mtime(),
 290                            host_file.mtime(),
 291                            "guest {} mtime does not match host {} for path {:?} in project {}",
 292                            guest_user_id,
 293                            host_user_id,
 294                            guest_file.path(),
 295                            project_id,
 296                        );
 297                    }
 298                    (None, None) => {}
 299                    (None, _) => panic!("host's file is None, guest's isn't"),
 300                    (_, None) => panic!("guest's file is None, hosts's isn't"),
 301                }
 302
 303                let host_diff_base =
 304                    host_buffer.read_with(host_cx, |b, _| b.diff_base().map(ToString::to_string));
 305                let guest_diff_base = guest_buffer
 306                    .read_with(client_cx, |b, _| b.diff_base().map(ToString::to_string));
 307                assert_eq!(guest_diff_base, host_diff_base);
 308            }
 309        }
 310    }
 311
 312    for (client, mut cx) in clients {
 313        cx.update(|cx| {
 314            cx.clear_globals();
 315            drop(client);
 316        });
 317    }
 318}
 319
 320async fn apply_server_operation(
 321    deterministic: Arc<Deterministic>,
 322    server: &mut TestServer,
 323    clients: &mut Vec<(Rc<TestClient>, TestAppContext)>,
 324    client_tasks: &mut Vec<Task<()>>,
 325    operation_channels: &mut Vec<futures::channel::mpsc::UnboundedSender<()>>,
 326    next_entity_id: &mut usize,
 327    plan: Arc<Mutex<TestPlan>>,
 328    operation: Operation,
 329    cx: &mut TestAppContext,
 330) -> bool {
 331    match operation {
 332        Operation::AddConnection { user_id } => {
 333            let username;
 334            {
 335                let mut plan = plan.lock();
 336                let mut user = plan.user(user_id);
 337                if user.online {
 338                    return false;
 339                }
 340                user.online = true;
 341                username = user.username.clone();
 342            };
 343            log::info!("Adding new connection for {}", username);
 344            *next_entity_id += 100000;
 345            let mut client_cx = TestAppContext::new(
 346                cx.foreground_platform(),
 347                cx.platform(),
 348                deterministic.build_foreground(*next_entity_id),
 349                deterministic.build_background(),
 350                cx.font_cache(),
 351                cx.leak_detector(),
 352                *next_entity_id,
 353                cx.function_name.clone(),
 354            );
 355
 356            let (operation_tx, operation_rx) = futures::channel::mpsc::unbounded();
 357            let client = Rc::new(server.create_client(&mut client_cx, &username).await);
 358            operation_channels.push(operation_tx);
 359            clients.push((client.clone(), client_cx.clone()));
 360            client_tasks.push(client_cx.foreground().spawn(simulate_client(
 361                client,
 362                operation_rx,
 363                plan.clone(),
 364                client_cx,
 365            )));
 366
 367            log::info!("Added connection for {}", username);
 368        }
 369
 370        Operation::RemoveConnection { user_id } => {
 371            log::info!("Simulating full disconnection of user {}", user_id);
 372            let client_ix = clients
 373                .iter()
 374                .position(|(client, cx)| client.current_user_id(cx) == user_id);
 375            let Some(client_ix) = client_ix else { return false };
 376            let user_connection_ids = server
 377                .connection_pool
 378                .lock()
 379                .user_connection_ids(user_id)
 380                .collect::<Vec<_>>();
 381            assert_eq!(user_connection_ids.len(), 1);
 382            let removed_peer_id = user_connection_ids[0].into();
 383            let (client, mut client_cx) = clients.remove(client_ix);
 384            let client_task = client_tasks.remove(client_ix);
 385            operation_channels.remove(client_ix);
 386            server.forbid_connections();
 387            server.disconnect_client(removed_peer_id);
 388            deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
 389            deterministic.start_waiting();
 390            log::info!("Waiting for user {} to exit...", user_id);
 391            client_task.await;
 392            deterministic.finish_waiting();
 393            server.allow_connections();
 394
 395            for project in client.remote_projects().iter() {
 396                project.read_with(&client_cx, |project, _| {
 397                    assert!(
 398                        project.is_read_only(),
 399                        "project {:?} should be read only",
 400                        project.remote_id()
 401                    )
 402                });
 403            }
 404
 405            for (client, cx) in clients {
 406                let contacts = server
 407                    .app_state
 408                    .db
 409                    .get_contacts(client.current_user_id(cx))
 410                    .await
 411                    .unwrap();
 412                let pool = server.connection_pool.lock();
 413                for contact in contacts {
 414                    if let db::Contact::Accepted { user_id: id, .. } = contact {
 415                        if pool.is_user_online(id) {
 416                            assert_ne!(
 417                                id, user_id,
 418                                "removed client is still a contact of another peer"
 419                            );
 420                        }
 421                    }
 422                }
 423            }
 424
 425            log::info!("{} removed", client.username);
 426            plan.lock().user(user_id).online = false;
 427            client_cx.update(|cx| {
 428                cx.clear_globals();
 429                drop(client);
 430            });
 431        }
 432
 433        Operation::BounceConnection { user_id } => {
 434            log::info!("Simulating temporary disconnection of user {}", user_id);
 435            let user_connection_ids = server
 436                .connection_pool
 437                .lock()
 438                .user_connection_ids(user_id)
 439                .collect::<Vec<_>>();
 440            if user_connection_ids.is_empty() {
 441                return false;
 442            }
 443            assert_eq!(user_connection_ids.len(), 1);
 444            let peer_id = user_connection_ids[0].into();
 445            server.disconnect_client(peer_id);
 446            deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
 447        }
 448
 449        Operation::RestartServer => {
 450            log::info!("Simulating server restart");
 451            server.reset().await;
 452            deterministic.advance_clock(RECEIVE_TIMEOUT);
 453            server.start().await.unwrap();
 454            deterministic.advance_clock(CLEANUP_TIMEOUT);
 455            let environment = &server.app_state.config.zed_environment;
 456            let stale_room_ids = server
 457                .app_state
 458                .db
 459                .stale_room_ids(environment, server.id())
 460                .await
 461                .unwrap();
 462            assert_eq!(stale_room_ids, vec![]);
 463        }
 464
 465        Operation::MutateClients { user_ids, quiesce } => {
 466            let mut applied = false;
 467            for user_id in user_ids {
 468                let client_ix = clients
 469                    .iter()
 470                    .position(|(client, cx)| client.current_user_id(cx) == user_id);
 471                let Some(client_ix) = client_ix else { continue };
 472                applied = true;
 473                if let Err(err) = operation_channels[client_ix].unbounded_send(()) {
 474                    // panic!("error signaling user {}, client {}", user_id, client_ix);
 475                }
 476            }
 477
 478            if quiesce && applied {
 479                deterministic.run_until_parked();
 480            }
 481
 482            return applied;
 483        }
 484    }
 485    true
 486}
 487
 488async fn apply_client_operation(
 489    client: &TestClient,
 490    operation: ClientOperation,
 491    cx: &mut TestAppContext,
 492) -> Result<bool> {
 493    match operation {
 494        ClientOperation::AcceptIncomingCall => {
 495            let active_call = cx.read(ActiveCall::global);
 496            if active_call.read_with(cx, |call, _| call.incoming().borrow().is_none()) {
 497                return Ok(false);
 498            }
 499
 500            log::info!("{}: accepting incoming call", client.username);
 501            active_call
 502                .update(cx, |call, cx| call.accept_incoming(cx))
 503                .await?;
 504        }
 505
 506        ClientOperation::RejectIncomingCall => {
 507            let active_call = cx.read(ActiveCall::global);
 508            if active_call.read_with(cx, |call, _| call.incoming().borrow().is_none()) {
 509                return Ok(false);
 510            }
 511
 512            log::info!("{}: declining incoming call", client.username);
 513            active_call.update(cx, |call, _| call.decline_incoming())?;
 514        }
 515
 516        ClientOperation::LeaveCall => {
 517            let active_call = cx.read(ActiveCall::global);
 518            if active_call.read_with(cx, |call, _| call.room().is_none()) {
 519                return Ok(false);
 520            }
 521
 522            log::info!("{}: hanging up", client.username);
 523            active_call.update(cx, |call, cx| call.hang_up(cx))?;
 524        }
 525
 526        ClientOperation::InviteContactToCall { user_id } => {
 527            let active_call = cx.read(ActiveCall::global);
 528
 529            log::info!("{}: inviting {}", client.username, user_id,);
 530            active_call
 531                .update(cx, |call, cx| call.invite(user_id.to_proto(), None, cx))
 532                .await
 533                .log_err();
 534        }
 535
 536        ClientOperation::OpenLocalProject { first_root_name } => {
 537            log::info!(
 538                "{}: opening local project at {:?}",
 539                client.username,
 540                first_root_name
 541            );
 542
 543            let root_path = Path::new("/").join(&first_root_name);
 544            client.fs.create_dir(&root_path).await.unwrap();
 545            client
 546                .fs
 547                .create_file(&root_path.join("main.rs"), Default::default())
 548                .await
 549                .unwrap();
 550            let project = client.build_local_project(root_path, cx).await.0;
 551            ensure_project_shared(&project, client, cx).await;
 552            client.local_projects_mut().push(project.clone());
 553        }
 554
 555        ClientOperation::AddWorktreeToProject {
 556            project_root_name,
 557            new_root_path,
 558        } => {
 559            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 560                return Ok(false)
 561            };
 562
 563            log::info!(
 564                "{}: finding/creating local worktree at {:?} to project with root path {}",
 565                client.username,
 566                new_root_path,
 567                project_root_name
 568            );
 569
 570            ensure_project_shared(&project, client, cx).await;
 571            if !client.fs.paths().await.contains(&new_root_path) {
 572                client.fs.create_dir(&new_root_path).await.unwrap();
 573            }
 574            project
 575                .update(cx, |project, cx| {
 576                    project.find_or_create_local_worktree(&new_root_path, true, cx)
 577                })
 578                .await
 579                .unwrap();
 580        }
 581
 582        ClientOperation::CloseRemoteProject { project_root_name } => {
 583            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 584                return Ok(false)
 585            };
 586
 587            log::info!(
 588                "{}: closing remote project with root path {}",
 589                client.username,
 590                project_root_name,
 591            );
 592
 593            let ix = client
 594                .remote_projects()
 595                .iter()
 596                .position(|p| p == &project)
 597                .unwrap();
 598            cx.update(|_| {
 599                client.remote_projects_mut().remove(ix);
 600                client.buffers().retain(|project, _| project != project);
 601                drop(project);
 602            });
 603        }
 604
 605        ClientOperation::OpenRemoteProject {
 606            host_id,
 607            first_root_name,
 608        } => {
 609            let active_call = cx.read(ActiveCall::global);
 610            let project = active_call.update(cx, |call, cx| {
 611                let room = call.room().cloned()?;
 612                let participant = room
 613                    .read(cx)
 614                    .remote_participants()
 615                    .get(&host_id.to_proto())?;
 616                let project_id = participant
 617                    .projects
 618                    .iter()
 619                    .find(|project| project.worktree_root_names[0] == first_root_name)?
 620                    .id;
 621                Some(room.update(cx, |room, cx| {
 622                    room.join_project(
 623                        project_id,
 624                        client.language_registry.clone(),
 625                        FakeFs::new(cx.background().clone()),
 626                        cx,
 627                    )
 628                }))
 629            });
 630            let Some(project) = project else {
 631                return Ok(false)
 632            };
 633
 634            log::info!(
 635                "{}: joining remote project of user {}, root name {}",
 636                client.username,
 637                host_id,
 638                first_root_name,
 639            );
 640
 641            let project = project.await?;
 642            client.remote_projects_mut().push(project.clone());
 643        }
 644
 645        ClientOperation::CreateWorktreeEntry {
 646            project_root_name,
 647            is_local,
 648            full_path,
 649            is_dir,
 650        } => {
 651            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 652                return Ok(false);
 653            };
 654            let Some(project_path) = project_path_for_full_path(&project, &full_path, cx) else {
 655                return Ok(false);
 656            };
 657
 658            log::info!(
 659                "{}: creating {} at path {:?} in {} project {}",
 660                client.username,
 661                if is_dir { "dir" } else { "file" },
 662                full_path,
 663                if is_local { "local" } else { "remote" },
 664                project_root_name,
 665            );
 666
 667            ensure_project_shared(&project, client, cx).await;
 668            project
 669                .update(cx, |p, cx| p.create_entry(project_path, is_dir, cx))
 670                .unwrap()
 671                .await?;
 672        }
 673
 674        ClientOperation::OpenBuffer {
 675            project_root_name,
 676            is_local,
 677            full_path,
 678        } => {
 679            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 680                return Ok(false);
 681            };
 682            let Some(project_path) = project_path_for_full_path(&project, &full_path, cx) else {
 683                return Ok(false);
 684            };
 685
 686            log::info!(
 687                "{}: opening buffer {:?} in {} project {}",
 688                client.username,
 689                full_path,
 690                if is_local { "local" } else { "remote" },
 691                project_root_name,
 692            );
 693
 694            ensure_project_shared(&project, client, cx).await;
 695            let buffer = project
 696                .update(cx, |project, cx| project.open_buffer(project_path, cx))
 697                .await?;
 698            client.buffers_for_project(&project).insert(buffer);
 699        }
 700
 701        ClientOperation::EditBuffer {
 702            project_root_name,
 703            is_local,
 704            full_path,
 705            edits,
 706        } => {
 707            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 708                return Ok(false);
 709            };
 710            let Some(buffer) =
 711                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 712                    return Ok(false);
 713                };
 714
 715            log::info!(
 716                "{}: editing buffer {:?} in {} project {} with {:?}",
 717                client.username,
 718                full_path,
 719                if is_local { "local" } else { "remote" },
 720                project_root_name,
 721                edits
 722            );
 723
 724            ensure_project_shared(&project, client, cx).await;
 725            buffer.update(cx, |buffer, cx| {
 726                let snapshot = buffer.snapshot();
 727                buffer.edit(
 728                    edits.into_iter().map(|(range, text)| {
 729                        let start = snapshot.clip_offset(range.start, Bias::Left);
 730                        let end = snapshot.clip_offset(range.end, Bias::Right);
 731                        (start..end, text)
 732                    }),
 733                    None,
 734                    cx,
 735                );
 736            });
 737        }
 738
 739        ClientOperation::CloseBuffer {
 740            project_root_name,
 741            is_local,
 742            full_path,
 743        } => {
 744            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 745                return Ok(false);
 746            };
 747            let Some(buffer) =
 748                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 749                    return Ok(false);
 750                };
 751
 752            log::info!(
 753                "{}: closing buffer {:?} in {} project {}",
 754                client.username,
 755                full_path,
 756                if is_local { "local" } else { "remote" },
 757                project_root_name
 758            );
 759
 760            ensure_project_shared(&project, client, cx).await;
 761            cx.update(|_| {
 762                client.buffers_for_project(&project).remove(&buffer);
 763                drop(buffer);
 764            });
 765        }
 766
 767        ClientOperation::SaveBuffer {
 768            project_root_name,
 769            is_local,
 770            full_path,
 771            detach,
 772        } => {
 773            let Some(project) = project_for_root_name(client, &project_root_name, cx) else {
 774                return Ok(false);
 775            };
 776            let Some(buffer) =
 777                buffer_for_full_path(&*client.buffers_for_project(&project), &full_path, cx) else {
 778                    return Ok(false);
 779                };
 780
 781            log::info!(
 782                "{}: saving buffer {:?} in {} project {}{}",
 783                client.username,
 784                full_path,
 785                if is_local { "local" } else { "remote" },
 786                project_root_name,
 787                if detach { ", detaching" } else { ", awaiting" }
 788            );
 789
 790            ensure_project_shared(&project, client, cx).await;
 791            let (requested_version, save) =
 792                buffer.update(cx, |buffer, cx| (buffer.version(), buffer.save(cx)));
 793            let save = cx.background().spawn(async move {
 794                let (saved_version, _, _) = save
 795                    .await
 796                    .map_err(|err| anyhow!("save request failed: {:?}", err))?;
 797                assert!(saved_version.observed_all(&requested_version));
 798                anyhow::Ok(())
 799            });
 800            if detach {
 801                log::info!("{}: detaching save request", client.username);
 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                log::info!("{}: detaching save request", client.username);
 903                cx.update(|cx| search.detach_and_log_err(cx));
 904            } else {
 905                search.await?;
 906            }
 907        }
 908
 909        ClientOperation::CreateFsEntry { path, is_dir } => {
 910            if client.fs.metadata(&path.parent().unwrap()).await?.is_none() {
 911                return Ok(false);
 912            }
 913
 914            log::info!(
 915                "{}: creating {} at {:?}",
 916                client.username,
 917                if is_dir { "dir" } else { "file" },
 918                path
 919            );
 920
 921            if is_dir {
 922                client.fs.create_dir(&path).await.unwrap();
 923            } else {
 924                client
 925                    .fs
 926                    .create_file(&path, Default::default())
 927                    .await
 928                    .unwrap();
 929            }
 930        }
 931
 932        ClientOperation::WriteGitIndex {
 933            repo_path,
 934            contents,
 935        } => {
 936            if !client
 937                .fs
 938                .metadata(&repo_path)
 939                .await?
 940                .map_or(false, |m| m.is_dir)
 941            {
 942                return Ok(false);
 943            }
 944
 945            log::info!(
 946                "{}: writing git index for repo {:?}: {:?}",
 947                client.username,
 948                repo_path,
 949                contents
 950            );
 951
 952            let dot_git_dir = repo_path.join(".git");
 953            let contents = contents
 954                .iter()
 955                .map(|(path, contents)| (path.as_path(), contents.clone()))
 956                .collect::<Vec<_>>();
 957            if client.fs.metadata(&dot_git_dir).await?.is_none() {
 958                client.fs.create_dir(&dot_git_dir).await?;
 959            }
 960            client.fs.set_index_for_repo(&dot_git_dir, &contents).await;
 961        }
 962    }
 963    Ok(true)
 964}
 965
 966struct TestPlan {
 967    rng: StdRng,
 968    replay: bool,
 969    stored_operations: Vec<(StoredOperation, Arc<AtomicBool>)>,
 970    max_operations: usize,
 971    operation_ix: usize,
 972    users: Vec<UserTestPlan>,
 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        operation: ClientOperation,
 993    },
 994}
 995
 996#[derive(Clone, Debug, Serialize, Deserialize)]
 997enum Operation {
 998    AddConnection {
 999        user_id: UserId,
1000    },
1001    RemoveConnection {
1002        user_id: UserId,
1003    },
1004    BounceConnection {
1005        user_id: UserId,
1006    },
1007    RestartServer,
1008    MutateClients {
1009        user_ids: Vec<UserId>,
1010        quiesce: bool,
1011    },
1012}
1013
1014#[derive(Clone, Debug, Serialize, Deserialize)]
1015enum ClientOperation {
1016    AcceptIncomingCall,
1017    RejectIncomingCall,
1018    LeaveCall,
1019    InviteContactToCall {
1020        user_id: UserId,
1021    },
1022    OpenLocalProject {
1023        first_root_name: String,
1024    },
1025    OpenRemoteProject {
1026        host_id: UserId,
1027        first_root_name: String,
1028    },
1029    AddWorktreeToProject {
1030        project_root_name: String,
1031        new_root_path: PathBuf,
1032    },
1033    CloseRemoteProject {
1034        project_root_name: String,
1035    },
1036    OpenBuffer {
1037        project_root_name: String,
1038        is_local: bool,
1039        full_path: PathBuf,
1040    },
1041    SearchProject {
1042        project_root_name: String,
1043        is_local: bool,
1044        query: String,
1045        detach: bool,
1046    },
1047    EditBuffer {
1048        project_root_name: String,
1049        is_local: bool,
1050        full_path: PathBuf,
1051        edits: Vec<(Range<usize>, Arc<str>)>,
1052    },
1053    CloseBuffer {
1054        project_root_name: String,
1055        is_local: bool,
1056        full_path: PathBuf,
1057    },
1058    SaveBuffer {
1059        project_root_name: String,
1060        is_local: bool,
1061        full_path: PathBuf,
1062        detach: bool,
1063    },
1064    RequestLspDataInBuffer {
1065        project_root_name: String,
1066        is_local: bool,
1067        full_path: PathBuf,
1068        offset: usize,
1069        kind: LspRequestKind,
1070        detach: bool,
1071    },
1072    CreateWorktreeEntry {
1073        project_root_name: String,
1074        is_local: bool,
1075        full_path: PathBuf,
1076        is_dir: bool,
1077    },
1078    CreateFsEntry {
1079        path: PathBuf,
1080        is_dir: bool,
1081    },
1082    WriteGitIndex {
1083        repo_path: PathBuf,
1084        contents: Vec<(PathBuf, String)>,
1085    },
1086}
1087
1088#[derive(Clone, Debug, Serialize, Deserialize)]
1089enum LspRequestKind {
1090    Rename,
1091    Completion,
1092    CodeAction,
1093    Definition,
1094    Highlights,
1095}
1096
1097impl TestPlan {
1098    fn new(mut rng: StdRng, users: Vec<UserTestPlan>, max_operations: usize) -> Self {
1099        Self {
1100            replay: false,
1101            allow_server_restarts: rng.gen_bool(0.7),
1102            allow_client_reconnection: rng.gen_bool(0.7),
1103            allow_client_disconnection: rng.gen_bool(0.1),
1104            stored_operations: Vec::new(),
1105            operation_ix: 0,
1106            max_operations,
1107            users,
1108            rng,
1109        }
1110    }
1111
1112    fn load(&mut self, path: &Path) {
1113        let json = std::fs::read_to_string(path).unwrap();
1114        self.replay = true;
1115        let stored_operations: Vec<StoredOperation> = serde_json::from_str(&json).unwrap();
1116        self.stored_operations = stored_operations
1117            .into_iter()
1118            .map(|operation| (operation, Arc::new(AtomicBool::new(false))))
1119            .collect()
1120    }
1121
1122    fn save(&mut self, path: &Path) {
1123        // Format each operation as one line
1124        let mut json = Vec::new();
1125        json.push(b'[');
1126        for (operation, skipped) in &self.stored_operations {
1127            if skipped.load(SeqCst) {
1128                continue;
1129            }
1130            if json.len() > 1 {
1131                json.push(b',');
1132            }
1133            json.extend_from_slice(b"\n  ");
1134            serde_json::to_writer(&mut json, operation).unwrap();
1135        }
1136        json.extend_from_slice(b"\n]\n");
1137        std::fs::write(path, &json).unwrap();
1138    }
1139
1140    fn next_server_operation(
1141        &mut self,
1142        clients: &[(Rc<TestClient>, TestAppContext)],
1143    ) -> Option<(Operation, Arc<AtomicBool>)> {
1144        if self.replay {
1145            while let Some(stored_operation) = self.stored_operations.get(self.operation_ix) {
1146                self.operation_ix += 1;
1147                if let (StoredOperation::Server(operation), skipped) = stored_operation {
1148                    return Some((operation.clone(), skipped.clone()));
1149                }
1150            }
1151            None
1152        } else {
1153            let operation = self.generate_server_operation(clients)?;
1154            let skipped = Arc::new(AtomicBool::new(false));
1155            self.stored_operations
1156                .push((StoredOperation::Server(operation.clone()), skipped.clone()));
1157            Some((operation, skipped))
1158        }
1159    }
1160
1161    fn next_client_operation(
1162        &mut self,
1163        client: &TestClient,
1164        cx: &TestAppContext,
1165    ) -> Option<(ClientOperation, Arc<AtomicBool>)> {
1166        let current_user_id = client.current_user_id(cx);
1167        let user_ix = self
1168            .users
1169            .iter()
1170            .position(|user| user.user_id == current_user_id)
1171            .unwrap();
1172        let user_plan = &mut self.users[user_ix];
1173
1174        if self.replay {
1175            while let Some(stored_operation) = self.stored_operations.get(user_plan.operation_ix) {
1176                user_plan.operation_ix += 1;
1177                if let (StoredOperation::Client { user_id, operation }, skipped) = stored_operation
1178                {
1179                    if user_id == &current_user_id {
1180                        return Some((operation.clone(), skipped.clone()));
1181                    }
1182                }
1183            }
1184            None
1185        } else {
1186            let operation = self.generate_client_operation(current_user_id, client, cx)?;
1187            let skipped = Arc::new(AtomicBool::new(false));
1188            self.stored_operations.push((
1189                StoredOperation::Client {
1190                    user_id: current_user_id,
1191                    operation: operation.clone(),
1192                },
1193                skipped.clone(),
1194            ));
1195            Some((operation, skipped))
1196        }
1197    }
1198
1199    fn generate_server_operation(
1200        &mut self,
1201        clients: &[(Rc<TestClient>, TestAppContext)],
1202    ) -> Option<Operation> {
1203        if self.operation_ix == self.max_operations {
1204            return None;
1205        }
1206
1207        Some(loop {
1208            break match self.rng.gen_range(0..100) {
1209                0..=29 if clients.len() < self.users.len() => {
1210                    let user = self
1211                        .users
1212                        .iter()
1213                        .filter(|u| !u.online)
1214                        .choose(&mut self.rng)
1215                        .unwrap();
1216                    self.operation_ix += 1;
1217                    Operation::AddConnection {
1218                        user_id: user.user_id,
1219                    }
1220                }
1221                30..=34 if clients.len() > 1 && self.allow_client_disconnection => {
1222                    let (client, cx) = &clients[self.rng.gen_range(0..clients.len())];
1223                    let user_id = client.current_user_id(cx);
1224                    self.operation_ix += 1;
1225                    Operation::RemoveConnection { user_id }
1226                }
1227                35..=39 if clients.len() > 1 && self.allow_client_reconnection => {
1228                    let (client, cx) = &clients[self.rng.gen_range(0..clients.len())];
1229                    let user_id = client.current_user_id(cx);
1230                    self.operation_ix += 1;
1231                    Operation::BounceConnection { user_id }
1232                }
1233                40..=44 if self.allow_server_restarts && clients.len() > 1 => {
1234                    self.operation_ix += 1;
1235                    Operation::RestartServer
1236                }
1237                _ if !clients.is_empty() => {
1238                    let count = self
1239                        .rng
1240                        .gen_range(1..10)
1241                        .min(self.max_operations - self.operation_ix);
1242                    let user_ids = (0..count)
1243                        .map(|_| {
1244                            let ix = self.rng.gen_range(0..clients.len());
1245                            let (client, cx) = &clients[ix];
1246                            client.current_user_id(cx)
1247                        })
1248                        .collect();
1249                    Operation::MutateClients {
1250                        user_ids,
1251                        quiesce: self.rng.gen_bool(0.7),
1252                    }
1253                }
1254                _ => continue,
1255            };
1256        })
1257    }
1258
1259    fn generate_client_operation(
1260        &mut self,
1261        user_id: UserId,
1262        client: &TestClient,
1263        cx: &TestAppContext,
1264    ) -> Option<ClientOperation> {
1265        if self.operation_ix == self.max_operations {
1266            return None;
1267        }
1268
1269        let executor = cx.background();
1270        self.operation_ix += 1;
1271        let call = cx.read(ActiveCall::global);
1272        Some(loop {
1273            match self.rng.gen_range(0..100_u32) {
1274                // Mutate the call
1275                0..=29 => {
1276                    // Respond to an incoming call
1277                    if call.read_with(cx, |call, _| call.incoming().borrow().is_some()) {
1278                        break if self.rng.gen_bool(0.7) {
1279                            ClientOperation::AcceptIncomingCall
1280                        } else {
1281                            ClientOperation::RejectIncomingCall
1282                        };
1283                    }
1284
1285                    match self.rng.gen_range(0..100_u32) {
1286                        // Invite a contact to the current call
1287                        0..=70 => {
1288                            let available_contacts =
1289                                client.user_store.read_with(cx, |user_store, _| {
1290                                    user_store
1291                                        .contacts()
1292                                        .iter()
1293                                        .filter(|contact| contact.online && !contact.busy)
1294                                        .cloned()
1295                                        .collect::<Vec<_>>()
1296                                });
1297                            if !available_contacts.is_empty() {
1298                                let contact = available_contacts.choose(&mut self.rng).unwrap();
1299                                break ClientOperation::InviteContactToCall {
1300                                    user_id: UserId(contact.user.id as i32),
1301                                };
1302                            }
1303                        }
1304
1305                        // Leave the current call
1306                        71.. => {
1307                            if self.allow_client_disconnection
1308                                && call.read_with(cx, |call, _| call.room().is_some())
1309                            {
1310                                break ClientOperation::LeaveCall;
1311                            }
1312                        }
1313                    }
1314                }
1315
1316                // Mutate projects
1317                30..=59 => match self.rng.gen_range(0..100_u32) {
1318                    // Open a new project
1319                    0..=70 => {
1320                        // Open a remote project
1321                        if let Some(room) = call.read_with(cx, |call, _| call.room().cloned()) {
1322                            let existing_remote_project_ids = cx.read(|cx| {
1323                                client
1324                                    .remote_projects()
1325                                    .iter()
1326                                    .map(|p| p.read(cx).remote_id().unwrap())
1327                                    .collect::<Vec<_>>()
1328                            });
1329                            let new_remote_projects = room.read_with(cx, |room, _| {
1330                                room.remote_participants()
1331                                    .values()
1332                                    .flat_map(|participant| {
1333                                        participant.projects.iter().filter_map(|project| {
1334                                            if existing_remote_project_ids.contains(&project.id) {
1335                                                None
1336                                            } else {
1337                                                Some((
1338                                                    UserId::from_proto(participant.user.id),
1339                                                    project.worktree_root_names[0].clone(),
1340                                                ))
1341                                            }
1342                                        })
1343                                    })
1344                                    .collect::<Vec<_>>()
1345                            });
1346                            if !new_remote_projects.is_empty() {
1347                                let (host_id, first_root_name) =
1348                                    new_remote_projects.choose(&mut self.rng).unwrap().clone();
1349                                break ClientOperation::OpenRemoteProject {
1350                                    host_id,
1351                                    first_root_name,
1352                                };
1353                            }
1354                        }
1355                        // Open a local project
1356                        else {
1357                            let first_root_name = self.next_root_dir_name(user_id);
1358                            break ClientOperation::OpenLocalProject { first_root_name };
1359                        }
1360                    }
1361
1362                    // Close a remote project
1363                    71..=80 => {
1364                        if !client.remote_projects().is_empty() {
1365                            let project = client
1366                                .remote_projects()
1367                                .choose(&mut self.rng)
1368                                .unwrap()
1369                                .clone();
1370                            let first_root_name = root_name_for_project(&project, cx);
1371                            break ClientOperation::CloseRemoteProject {
1372                                project_root_name: first_root_name,
1373                            };
1374                        }
1375                    }
1376
1377                    // Mutate project worktrees
1378                    81.. => match self.rng.gen_range(0..100_u32) {
1379                        // Add a worktree to a local project
1380                        0..=50 => {
1381                            let Some(project) = client
1382                                .local_projects()
1383                                .choose(&mut self.rng)
1384                                .cloned() else { continue };
1385                            let project_root_name = root_name_for_project(&project, cx);
1386                            let mut paths = executor.block(client.fs.paths());
1387                            paths.remove(0);
1388                            let new_root_path = if paths.is_empty() || self.rng.gen() {
1389                                Path::new("/").join(&self.next_root_dir_name(user_id))
1390                            } else {
1391                                paths.choose(&mut self.rng).unwrap().clone()
1392                            };
1393                            break ClientOperation::AddWorktreeToProject {
1394                                project_root_name,
1395                                new_root_path,
1396                            };
1397                        }
1398
1399                        // Add an entry to a worktree
1400                        _ => {
1401                            let Some(project) = choose_random_project(client, &mut self.rng) else { continue };
1402                            let project_root_name = root_name_for_project(&project, cx);
1403                            let is_local = project.read_with(cx, |project, _| project.is_local());
1404                            let worktree = project.read_with(cx, |project, cx| {
1405                                project
1406                                    .worktrees(cx)
1407                                    .filter(|worktree| {
1408                                        let worktree = worktree.read(cx);
1409                                        worktree.is_visible()
1410                                            && worktree.entries(false).any(|e| e.is_file())
1411                                            && worktree.root_entry().map_or(false, |e| e.is_dir())
1412                                    })
1413                                    .choose(&mut self.rng)
1414                            });
1415                            let Some(worktree) = worktree else { continue };
1416                            let is_dir = self.rng.gen::<bool>();
1417                            let mut full_path =
1418                                worktree.read_with(cx, |w, _| PathBuf::from(w.root_name()));
1419                            full_path.push(gen_file_name(&mut self.rng));
1420                            if !is_dir {
1421                                full_path.set_extension("rs");
1422                            }
1423                            break ClientOperation::CreateWorktreeEntry {
1424                                project_root_name,
1425                                is_local,
1426                                full_path,
1427                                is_dir,
1428                            };
1429                        }
1430                    },
1431                },
1432
1433                // Query and mutate buffers
1434                60..=90 => {
1435                    let Some(project) = choose_random_project(client, &mut self.rng) else { continue };
1436                    let project_root_name = root_name_for_project(&project, cx);
1437                    let is_local = project.read_with(cx, |project, _| project.is_local());
1438
1439                    match self.rng.gen_range(0..100_u32) {
1440                        // Manipulate an existing buffer
1441                        0..=70 => {
1442                            let Some(buffer) = client
1443                                .buffers_for_project(&project)
1444                                .iter()
1445                                .choose(&mut self.rng)
1446                                .cloned() else { continue };
1447
1448                            let full_path = buffer
1449                                .read_with(cx, |buffer, cx| buffer.file().unwrap().full_path(cx));
1450
1451                            match self.rng.gen_range(0..100_u32) {
1452                                // Close the buffer
1453                                0..=15 => {
1454                                    break ClientOperation::CloseBuffer {
1455                                        project_root_name,
1456                                        is_local,
1457                                        full_path,
1458                                    };
1459                                }
1460                                // Save the buffer
1461                                16..=29 if buffer.read_with(cx, |b, _| b.is_dirty()) => {
1462                                    let detach = self.rng.gen_bool(0.3);
1463                                    break ClientOperation::SaveBuffer {
1464                                        project_root_name,
1465                                        is_local,
1466                                        full_path,
1467                                        detach,
1468                                    };
1469                                }
1470                                // Edit the buffer
1471                                30..=69 => {
1472                                    let edits = buffer.read_with(cx, |buffer, _| {
1473                                        buffer.get_random_edits(&mut self.rng, 3)
1474                                    });
1475                                    break ClientOperation::EditBuffer {
1476                                        project_root_name,
1477                                        is_local,
1478                                        full_path,
1479                                        edits,
1480                                    };
1481                                }
1482                                // Make an LSP request
1483                                _ => {
1484                                    let offset = buffer.read_with(cx, |buffer, _| {
1485                                        buffer.clip_offset(
1486                                            self.rng.gen_range(0..=buffer.len()),
1487                                            language::Bias::Left,
1488                                        )
1489                                    });
1490                                    let detach = self.rng.gen();
1491                                    break ClientOperation::RequestLspDataInBuffer {
1492                                        project_root_name,
1493                                        full_path,
1494                                        offset,
1495                                        is_local,
1496                                        kind: match self.rng.gen_range(0..5_u32) {
1497                                            0 => LspRequestKind::Rename,
1498                                            1 => LspRequestKind::Highlights,
1499                                            2 => LspRequestKind::Definition,
1500                                            3 => LspRequestKind::CodeAction,
1501                                            4.. => LspRequestKind::Completion,
1502                                        },
1503                                        detach,
1504                                    };
1505                                }
1506                            }
1507                        }
1508
1509                        71..=80 => {
1510                            let query = self.rng.gen_range('a'..='z').to_string();
1511                            let detach = self.rng.gen_bool(0.3);
1512                            break ClientOperation::SearchProject {
1513                                project_root_name,
1514                                is_local,
1515                                query,
1516                                detach,
1517                            };
1518                        }
1519
1520                        // Open a buffer
1521                        81.. => {
1522                            let worktree = project.read_with(cx, |project, cx| {
1523                                project
1524                                    .worktrees(cx)
1525                                    .filter(|worktree| {
1526                                        let worktree = worktree.read(cx);
1527                                        worktree.is_visible()
1528                                            && worktree.entries(false).any(|e| e.is_file())
1529                                    })
1530                                    .choose(&mut self.rng)
1531                            });
1532                            let Some(worktree) = worktree else { continue };
1533                            let full_path = worktree.read_with(cx, |worktree, _| {
1534                                let entry = worktree
1535                                    .entries(false)
1536                                    .filter(|e| e.is_file())
1537                                    .choose(&mut self.rng)
1538                                    .unwrap();
1539                                if entry.path.as_ref() == Path::new("") {
1540                                    Path::new(worktree.root_name()).into()
1541                                } else {
1542                                    Path::new(worktree.root_name()).join(&entry.path)
1543                                }
1544                            });
1545                            break ClientOperation::OpenBuffer {
1546                                project_root_name,
1547                                is_local,
1548                                full_path,
1549                            };
1550                        }
1551                    }
1552                }
1553
1554                // Update a git index
1555                91..=95 => {
1556                    let repo_path = executor
1557                        .block(client.fs.directories())
1558                        .choose(&mut self.rng)
1559                        .unwrap()
1560                        .clone();
1561
1562                    let mut file_paths = executor
1563                        .block(client.fs.files())
1564                        .into_iter()
1565                        .filter(|path| path.starts_with(&repo_path))
1566                        .collect::<Vec<_>>();
1567                    let count = self.rng.gen_range(0..=file_paths.len());
1568                    file_paths.shuffle(&mut self.rng);
1569                    file_paths.truncate(count);
1570
1571                    let mut contents = Vec::new();
1572                    for abs_child_file_path in &file_paths {
1573                        let child_file_path = abs_child_file_path
1574                            .strip_prefix(&repo_path)
1575                            .unwrap()
1576                            .to_path_buf();
1577                        let new_base = Alphanumeric.sample_string(&mut self.rng, 16);
1578                        contents.push((child_file_path, new_base));
1579                    }
1580
1581                    break ClientOperation::WriteGitIndex {
1582                        repo_path,
1583                        contents,
1584                    };
1585                }
1586
1587                // Create a file or directory
1588                96.. => {
1589                    let is_dir = self.rng.gen::<bool>();
1590                    let mut path = cx
1591                        .background()
1592                        .block(client.fs.directories())
1593                        .choose(&mut self.rng)
1594                        .unwrap()
1595                        .clone();
1596                    path.push(gen_file_name(&mut self.rng));
1597                    if !is_dir {
1598                        path.set_extension("rs");
1599                    }
1600                    break ClientOperation::CreateFsEntry { path, is_dir };
1601                }
1602            }
1603        })
1604    }
1605
1606    fn next_root_dir_name(&mut self, user_id: UserId) -> String {
1607        let user_ix = self
1608            .users
1609            .iter()
1610            .position(|user| user.user_id == user_id)
1611            .unwrap();
1612        let root_id = util::post_inc(&mut self.users[user_ix].next_root_id);
1613        format!("dir-{user_id}-{root_id}")
1614    }
1615
1616    fn user(&mut self, user_id: UserId) -> &mut UserTestPlan {
1617        let ix = self
1618            .users
1619            .iter()
1620            .position(|user| user.user_id == user_id)
1621            .unwrap();
1622        &mut self.users[ix]
1623    }
1624}
1625
1626async fn simulate_client(
1627    client: Rc<TestClient>,
1628    mut operation_rx: futures::channel::mpsc::UnboundedReceiver<()>,
1629    plan: Arc<Mutex<TestPlan>>,
1630    mut cx: TestAppContext,
1631) {
1632    // Setup language server
1633    let mut language = Language::new(
1634        LanguageConfig {
1635            name: "Rust".into(),
1636            path_suffixes: vec!["rs".to_string()],
1637            ..Default::default()
1638        },
1639        None,
1640    );
1641    let _fake_language_servers = language
1642        .set_fake_lsp_adapter(Arc::new(FakeLspAdapter {
1643            name: "the-fake-language-server",
1644            capabilities: lsp::LanguageServer::full_capabilities(),
1645            initializer: Some(Box::new({
1646                let plan = plan.clone();
1647                let fs = client.fs.clone();
1648                move |fake_server: &mut FakeLanguageServer| {
1649                    fake_server.handle_request::<lsp::request::Completion, _, _>(
1650                        |_, _| async move {
1651                            Ok(Some(lsp::CompletionResponse::Array(vec![
1652                                lsp::CompletionItem {
1653                                    text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
1654                                        range: lsp::Range::new(
1655                                            lsp::Position::new(0, 0),
1656                                            lsp::Position::new(0, 0),
1657                                        ),
1658                                        new_text: "the-new-text".to_string(),
1659                                    })),
1660                                    ..Default::default()
1661                                },
1662                            ])))
1663                        },
1664                    );
1665
1666                    fake_server.handle_request::<lsp::request::CodeActionRequest, _, _>(
1667                        |_, _| async move {
1668                            Ok(Some(vec![lsp::CodeActionOrCommand::CodeAction(
1669                                lsp::CodeAction {
1670                                    title: "the-code-action".to_string(),
1671                                    ..Default::default()
1672                                },
1673                            )]))
1674                        },
1675                    );
1676
1677                    fake_server.handle_request::<lsp::request::PrepareRenameRequest, _, _>(
1678                        |params, _| async move {
1679                            Ok(Some(lsp::PrepareRenameResponse::Range(lsp::Range::new(
1680                                params.position,
1681                                params.position,
1682                            ))))
1683                        },
1684                    );
1685
1686                    fake_server.handle_request::<lsp::request::GotoDefinition, _, _>({
1687                        let fs = fs.clone();
1688                        let plan = plan.clone();
1689                        move |_, _| {
1690                            let fs = fs.clone();
1691                            let plan = plan.clone();
1692                            async move {
1693                                let files = fs.files().await;
1694                                let count = plan.lock().rng.gen_range::<usize, _>(1..3);
1695                                let files = (0..count)
1696                                    .map(|_| files.choose(&mut plan.lock().rng).unwrap())
1697                                    .collect::<Vec<_>>();
1698                                log::info!("LSP: Returning definitions in files {:?}", &files);
1699                                Ok(Some(lsp::GotoDefinitionResponse::Array(
1700                                    files
1701                                        .into_iter()
1702                                        .map(|file| lsp::Location {
1703                                            uri: lsp::Url::from_file_path(file).unwrap(),
1704                                            range: Default::default(),
1705                                        })
1706                                        .collect(),
1707                                )))
1708                            }
1709                        }
1710                    });
1711
1712                    fake_server.handle_request::<lsp::request::DocumentHighlightRequest, _, _>({
1713                        let plan = plan.clone();
1714                        move |_, _| {
1715                            let mut highlights = Vec::new();
1716                            let highlight_count = plan.lock().rng.gen_range(1..=5);
1717                            for _ in 0..highlight_count {
1718                                let start_row = plan.lock().rng.gen_range(0..100);
1719                                let start_column = plan.lock().rng.gen_range(0..100);
1720                                let start = PointUtf16::new(start_row, start_column);
1721                                let end_row = plan.lock().rng.gen_range(0..100);
1722                                let end_column = plan.lock().rng.gen_range(0..100);
1723                                let end = PointUtf16::new(end_row, end_column);
1724                                let range = if start > end { end..start } else { start..end };
1725                                highlights.push(lsp::DocumentHighlight {
1726                                    range: range_to_lsp(range.clone()),
1727                                    kind: Some(lsp::DocumentHighlightKind::READ),
1728                                });
1729                            }
1730                            highlights.sort_unstable_by_key(|highlight| {
1731                                (highlight.range.start, highlight.range.end)
1732                            });
1733                            async move { Ok(Some(highlights)) }
1734                        }
1735                    });
1736                }
1737            })),
1738            ..Default::default()
1739        }))
1740        .await;
1741    client.language_registry.add(Arc::new(language));
1742
1743    while operation_rx.next().await.is_some() {
1744        let Some((operation, skipped)) = plan.lock().next_client_operation(&client, &cx) else { break };
1745        match apply_client_operation(&client, operation, &mut cx).await {
1746            Err(error) => {
1747                log::error!("{} error: {}", client.username, error);
1748            }
1749            Ok(applied) => {
1750                if !applied {
1751                    skipped.store(true, SeqCst);
1752                }
1753            }
1754        }
1755        cx.background().simulate_random_delay().await;
1756    }
1757    log::info!("{}: done", client.username);
1758}
1759
1760fn buffer_for_full_path(
1761    buffers: &HashSet<ModelHandle<language::Buffer>>,
1762    full_path: &PathBuf,
1763    cx: &TestAppContext,
1764) -> Option<ModelHandle<language::Buffer>> {
1765    buffers
1766        .iter()
1767        .find(|buffer| {
1768            buffer.read_with(cx, |buffer, cx| {
1769                buffer.file().unwrap().full_path(cx) == *full_path
1770            })
1771        })
1772        .cloned()
1773}
1774
1775fn project_for_root_name(
1776    client: &TestClient,
1777    root_name: &str,
1778    cx: &TestAppContext,
1779) -> Option<ModelHandle<Project>> {
1780    if let Some(ix) = project_ix_for_root_name(&*client.local_projects(), root_name, cx) {
1781        return Some(client.local_projects()[ix].clone());
1782    }
1783    if let Some(ix) = project_ix_for_root_name(&*client.remote_projects(), root_name, cx) {
1784        return Some(client.remote_projects()[ix].clone());
1785    }
1786    None
1787}
1788
1789fn project_ix_for_root_name(
1790    projects: &[ModelHandle<Project>],
1791    root_name: &str,
1792    cx: &TestAppContext,
1793) -> Option<usize> {
1794    projects.iter().position(|project| {
1795        project.read_with(cx, |project, cx| {
1796            let worktree = project.visible_worktrees(cx).next().unwrap();
1797            worktree.read(cx).root_name() == root_name
1798        })
1799    })
1800}
1801
1802fn root_name_for_project(project: &ModelHandle<Project>, cx: &TestAppContext) -> String {
1803    project.read_with(cx, |project, cx| {
1804        project
1805            .visible_worktrees(cx)
1806            .next()
1807            .unwrap()
1808            .read(cx)
1809            .root_name()
1810            .to_string()
1811    })
1812}
1813
1814fn project_path_for_full_path(
1815    project: &ModelHandle<Project>,
1816    full_path: &Path,
1817    cx: &TestAppContext,
1818) -> Option<ProjectPath> {
1819    let mut components = full_path.components();
1820    let root_name = components.next().unwrap().as_os_str().to_str().unwrap();
1821    let path = components.as_path().into();
1822    let worktree_id = project.read_with(cx, |project, cx| {
1823        project.worktrees(cx).find_map(|worktree| {
1824            let worktree = worktree.read(cx);
1825            if worktree.root_name() == root_name {
1826                Some(worktree.id())
1827            } else {
1828                None
1829            }
1830        })
1831    })?;
1832    Some(ProjectPath { worktree_id, path })
1833}
1834
1835async fn ensure_project_shared(
1836    project: &ModelHandle<Project>,
1837    client: &TestClient,
1838    cx: &mut TestAppContext,
1839) {
1840    let first_root_name = root_name_for_project(project, cx);
1841    let active_call = cx.read(ActiveCall::global);
1842    if active_call.read_with(cx, |call, _| call.room().is_some())
1843        && project.read_with(cx, |project, _| project.is_local() && !project.is_shared())
1844    {
1845        match active_call
1846            .update(cx, |call, cx| call.share_project(project.clone(), cx))
1847            .await
1848        {
1849            Ok(project_id) => {
1850                log::info!(
1851                    "{}: shared project {} with id {}",
1852                    client.username,
1853                    first_root_name,
1854                    project_id
1855                );
1856            }
1857            Err(error) => {
1858                log::error!(
1859                    "{}: error sharing project {}: {:?}",
1860                    client.username,
1861                    first_root_name,
1862                    error
1863                );
1864            }
1865        }
1866    }
1867}
1868
1869fn choose_random_project(client: &TestClient, rng: &mut StdRng) -> Option<ModelHandle<Project>> {
1870    client
1871        .local_projects()
1872        .iter()
1873        .chain(client.remote_projects().iter())
1874        .choose(rng)
1875        .cloned()
1876}
1877
1878fn gen_file_name(rng: &mut StdRng) -> String {
1879    let mut name = String::new();
1880    for _ in 0..10 {
1881        let letter = rng.gen_range('a'..='z');
1882        name.push(letter);
1883    }
1884    name
1885}
1886
1887fn path_env_var(name: &str) -> Option<PathBuf> {
1888    let value = env::var(name).ok()?;
1889    let mut path = PathBuf::from(value);
1890    if path.is_relative() {
1891        let mut abs_path = PathBuf::from(env!("CARGO_MANIFEST_DIR"));
1892        abs_path.pop();
1893        abs_path.pop();
1894        abs_path.push(path);
1895        path = abs_path
1896    }
1897    Some(path)
1898}