sync_worker.cc revision 03b57e008b61dfcb1fbad3aea950ae0e001748b0 
1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/sync_file_system/drive_backend/sync_worker.h"
6
7#include <vector>
8
9#include "base/bind.h"
10#include "chrome/browser/drive/drive_service_interface.h"
11#include "chrome/browser/extensions/extension_service.h"
12#include "chrome/browser/sync_file_system/drive_backend/callback_helper.h"
13#include "chrome/browser/sync_file_system/drive_backend/conflict_resolver.h"
14#include "chrome/browser/sync_file_system/drive_backend/drive_backend_constants.h"
15#include "chrome/browser/sync_file_system/drive_backend/list_changes_task.h"
16#include "chrome/browser/sync_file_system/drive_backend/local_to_remote_syncer.h"
17#include "chrome/browser/sync_file_system/drive_backend/metadata_database.h"
18#include "chrome/browser/sync_file_system/drive_backend/register_app_task.h"
19#include "chrome/browser/sync_file_system/drive_backend/remote_change_processor_on_worker.h"
20#include "chrome/browser/sync_file_system/drive_backend/remote_to_local_syncer.h"
21#include "chrome/browser/sync_file_system/drive_backend/sync_engine_context.h"
22#include "chrome/browser/sync_file_system/drive_backend/sync_engine_initializer.h"
23#include "chrome/browser/sync_file_system/drive_backend/sync_task.h"
24#include "chrome/browser/sync_file_system/drive_backend/uninstall_app_task.h"
25#include "chrome/browser/sync_file_system/logger.h"
26#include "chrome/browser/sync_file_system/syncable_file_system_util.h"
27#include "webkit/common/fileapi/file_system_util.h"
28
29namespace sync_file_system {
30
31class RemoteChangeProcessor;
32
33namespace drive_backend {
34
35namespace {
36
37void EmptyStatusCallback(SyncStatusCode status) {}
38
39void InvokeIdleCallback(const base::Closure& idle_callback,
40                        const SyncStatusCallback& callback) {
41  idle_callback.Run();
42  callback.Run(SYNC_STATUS_OK);
43}
44
45}  // namespace
46
47SyncWorker::SyncWorker(
48    const base::FilePath& base_dir,
49    const base::WeakPtr<ExtensionServiceInterface>& extension_service,
50    leveldb::Env* env_override)
51    : base_dir_(base_dir),
52      env_override_(env_override),
53      service_state_(REMOTE_SERVICE_TEMPORARY_UNAVAILABLE),
54      should_check_conflict_(true),
55      should_check_remote_change_(true),
56      listing_remote_changes_(false),
57      sync_enabled_(false),
58      extension_service_(extension_service),
59      weak_ptr_factory_(this) {
60  sequence_checker_.DetachFromSequence();
61  DCHECK(base_dir_.IsAbsolute());
62}
63
64SyncWorker::~SyncWorker() {
65  observers_.Clear();
66}
67
68void SyncWorker::Initialize(scoped_ptr<SyncEngineContext> context) {
69  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
70  DCHECK(!task_manager_);
71
72  context_ = context.Pass();
73
74  task_manager_.reset(new SyncTaskManager(
75      weak_ptr_factory_.GetWeakPtr(), 0 /* maximum_background_task */,
76      context_->GetWorkerTaskRunner()));
77  task_manager_->Initialize(SYNC_STATUS_OK);
78
79  PostInitializeTask();
80}
81
82void SyncWorker::RegisterOrigin(
83    const GURL& origin,
84    const SyncStatusCallback& callback) {
85  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
86
87  if (!GetMetadataDatabase())
88    PostInitializeTask();
89
90  scoped_ptr<RegisterAppTask> task(
91      new RegisterAppTask(context_.get(), origin.host()));
92  if (task->CanFinishImmediately()) {
93    callback.Run(SYNC_STATUS_OK);
94    return;
95  }
96
97  task_manager_->ScheduleSyncTask(
98      FROM_HERE,
99      task.PassAs<SyncTask>(),
100      SyncTaskManager::PRIORITY_HIGH,
101      callback);
102}
103
104void SyncWorker::EnableOrigin(
105    const GURL& origin,
106    const SyncStatusCallback& callback) {
107  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
108
109  task_manager_->ScheduleTask(
110      FROM_HERE,
111      base::Bind(&SyncWorker::DoEnableApp,
112                 weak_ptr_factory_.GetWeakPtr(),
113                 origin.host()),
114      SyncTaskManager::PRIORITY_HIGH,
115      callback);
116}
117
118void SyncWorker::DisableOrigin(
119    const GURL& origin,
120    const SyncStatusCallback& callback) {
121  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
122
123  task_manager_->ScheduleTask(
124      FROM_HERE,
125      base::Bind(&SyncWorker::DoDisableApp,
126                 weak_ptr_factory_.GetWeakPtr(),
127                 origin.host()),
128      SyncTaskManager::PRIORITY_HIGH,
129      callback);
130}
131
132void SyncWorker::UninstallOrigin(
133    const GURL& origin,
134    RemoteFileSyncService::UninstallFlag flag,
135    const SyncStatusCallback& callback) {
136  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
137
138  task_manager_->ScheduleSyncTask(
139      FROM_HERE,
140      scoped_ptr<SyncTask>(
141          new UninstallAppTask(context_.get(), origin.host(), flag)),
142      SyncTaskManager::PRIORITY_HIGH,
143      callback);
144}
145
146void SyncWorker::ProcessRemoteChange(const SyncFileCallback& callback) {
147  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
148
149  RemoteToLocalSyncer* syncer = new RemoteToLocalSyncer(context_.get());
150  task_manager_->ScheduleSyncTask(
151      FROM_HERE,
152      scoped_ptr<SyncTask>(syncer),
153      SyncTaskManager::PRIORITY_MED,
154      base::Bind(&SyncWorker::DidProcessRemoteChange,
155                 weak_ptr_factory_.GetWeakPtr(),
156                 syncer,
157                 callback));
158}
159
160void SyncWorker::SetRemoteChangeProcessor(
161    RemoteChangeProcessorOnWorker* remote_change_processor_on_worker) {
162  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
163
164  context_->SetRemoteChangeProcessor(remote_change_processor_on_worker);
165}
166
167RemoteServiceState SyncWorker::GetCurrentState() const {
168  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
169
170  if (!sync_enabled_)
171    return REMOTE_SERVICE_DISABLED;
172  return service_state_;
173}
174
175void SyncWorker::GetOriginStatusMap(
176    const RemoteFileSyncService::StatusMapCallback& callback) {
177  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
178
179  if (!GetMetadataDatabase())
180    return;
181
182  std::vector<std::string> app_ids;
183  GetMetadataDatabase()->GetRegisteredAppIDs(&app_ids);
184
185  scoped_ptr<RemoteFileSyncService::OriginStatusMap>
186      status_map(new RemoteFileSyncService::OriginStatusMap);
187  for (std::vector<std::string>::const_iterator itr = app_ids.begin();
188       itr != app_ids.end(); ++itr) {
189    const std::string& app_id = *itr;
190    GURL origin = extensions::Extension::GetBaseURLFromExtensionId(app_id);
191    (*status_map)[origin] =
192        GetMetadataDatabase()->IsAppEnabled(app_id) ? "Enabled" : "Disabled";
193  }
194
195  callback.Run(status_map.Pass());
196}
197
198scoped_ptr<base::ListValue> SyncWorker::DumpFiles(const GURL& origin) {
199  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
200
201  if (!GetMetadataDatabase())
202    return scoped_ptr<base::ListValue>();
203  return GetMetadataDatabase()->DumpFiles(origin.host());
204}
205
206scoped_ptr<base::ListValue> SyncWorker::DumpDatabase() {
207  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
208
209  if (!GetMetadataDatabase())
210    return scoped_ptr<base::ListValue>();
211  return GetMetadataDatabase()->DumpDatabase();
212}
213
214void SyncWorker::SetSyncEnabled(bool enabled) {
215  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
216
217  if (sync_enabled_ == enabled)
218    return;
219
220  RemoteServiceState old_state = GetCurrentState();
221  sync_enabled_ = enabled;
222  if (old_state == GetCurrentState())
223    return;
224
225  FOR_EACH_OBSERVER(
226      Observer,
227      observers_,
228      UpdateServiceState(
229          GetCurrentState(),
230          enabled ? "Sync is enabled" : "Sync is disabled"));
231}
232
233void SyncWorker::PromoteDemotedChanges(const base::Closure& callback) {
234  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
235
236  MetadataDatabase* metadata_db = GetMetadataDatabase();
237  if (metadata_db && metadata_db->HasLowPriorityDirtyTracker()) {
238    metadata_db->PromoteLowerPriorityTrackersToNormal();
239    FOR_EACH_OBSERVER(
240        Observer,
241        observers_,
242        OnPendingFileListUpdated(metadata_db->CountDirtyTracker()));
243  }
244  callback.Run();
245}
246
247void SyncWorker::ApplyLocalChange(const FileChange& local_change,
248                                  const base::FilePath& local_path,
249                                  const SyncFileMetadata& local_metadata,
250                                  const storage::FileSystemURL& url,
251                                  const SyncStatusCallback& callback) {
252  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
253
254  LocalToRemoteSyncer* syncer = new LocalToRemoteSyncer(
255      context_.get(), local_metadata, local_change, local_path, url);
256  task_manager_->ScheduleSyncTask(
257      FROM_HERE,
258      scoped_ptr<SyncTask>(syncer),
259      SyncTaskManager::PRIORITY_MED,
260      base::Bind(&SyncWorker::DidApplyLocalChange,
261                 weak_ptr_factory_.GetWeakPtr(),
262                 syncer,
263                 callback));
264}
265
266void SyncWorker::MaybeScheduleNextTask() {
267  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
268
269  if (GetCurrentState() == REMOTE_SERVICE_DISABLED)
270    return;
271
272  // TODO(tzik): Notify observer of OnRemoteChangeQueueUpdated.
273  // TODO(tzik): Add an interface to get the number of dirty trackers to
274  // MetadataDatabase.
275
276  if (MaybeStartFetchChanges())
277    return;
278
279  if (!call_on_idle_callback_.is_null()) {
280    base::Closure callback = call_on_idle_callback_;
281    call_on_idle_callback_.Reset();
282    callback.Run();
283  }
284}
285
286void SyncWorker::NotifyLastOperationStatus(
287    SyncStatusCode status,
288    bool used_network) {
289  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
290
291  UpdateServiceStateFromSyncStatusCode(status, used_network);
292
293  if (GetMetadataDatabase()) {
294    FOR_EACH_OBSERVER(
295        Observer, observers_,
296        OnPendingFileListUpdated(GetMetadataDatabase()->CountDirtyTracker()));
297  }
298}
299
300void SyncWorker::RecordTaskLog(scoped_ptr<TaskLogger::TaskLog> task_log) {
301  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
302
303  context_->GetUITaskRunner()->PostTask(
304      FROM_HERE,
305      base::Bind(&TaskLogger::RecordLog,
306                 context_->GetTaskLogger(),
307                 base::Passed(&task_log)));
308}
309
310void SyncWorker::ActivateService(RemoteServiceState service_state,
311                                 const std::string& description) {
312  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
313  UpdateServiceState(service_state, description);
314  if (!GetMetadataDatabase()) {
315    PostInitializeTask();
316    return;
317  }
318
319  should_check_remote_change_ = true;
320  MaybeScheduleNextTask();
321}
322
323void SyncWorker::DeactivateService(const std::string& description) {
324  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
325  UpdateServiceState(REMOTE_SERVICE_TEMPORARY_UNAVAILABLE, description);
326}
327
328void SyncWorker::DetachFromSequence() {
329  task_manager_->DetachFromSequence();
330  context_->DetachFromSequence();
331  sequence_checker_.DetachFromSequence();
332}
333
334void SyncWorker::AddObserver(Observer* observer) {
335  observers_.AddObserver(observer);
336}
337
338void SyncWorker::DoDisableApp(const std::string& app_id,
339                              const SyncStatusCallback& callback) {
340  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
341
342  if (GetMetadataDatabase()) {
343    GetMetadataDatabase()->DisableApp(app_id, callback);
344  } else {
345    callback.Run(SYNC_STATUS_OK);
346  }
347}
348
349void SyncWorker::DoEnableApp(const std::string& app_id,
350                             const SyncStatusCallback& callback) {
351  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
352
353  if (GetMetadataDatabase()) {
354    GetMetadataDatabase()->EnableApp(app_id, callback);
355  } else {
356    callback.Run(SYNC_STATUS_OK);
357  }
358}
359
360void SyncWorker::PostInitializeTask() {
361  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
362  DCHECK(!GetMetadataDatabase());
363
364  // This initializer task may not run if MetadataDatabase in context_ is
365  // already initialized when it runs.
366  SyncEngineInitializer* initializer =
367      new SyncEngineInitializer(context_.get(),
368                                base_dir_.Append(kDatabaseName),
369                                env_override_);
370  task_manager_->ScheduleSyncTask(
371      FROM_HERE,
372      scoped_ptr<SyncTask>(initializer),
373      SyncTaskManager::PRIORITY_HIGH,
374      base::Bind(&SyncWorker::DidInitialize,
375                 weak_ptr_factory_.GetWeakPtr(),
376                 initializer));
377}
378
379void SyncWorker::DidInitialize(SyncEngineInitializer* initializer,
380                               SyncStatusCode status) {
381  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
382
383  if (status == SYNC_STATUS_ACCESS_FORBIDDEN) {
384    UpdateServiceState(REMOTE_SERVICE_ACCESS_FORBIDDEN, "Access forbidden");
385    return;
386  }
387  if (status != SYNC_STATUS_OK) {
388    UpdateServiceState(REMOTE_SERVICE_TEMPORARY_UNAVAILABLE,
389                       "Could not initialize remote service");
390    return;
391  }
392
393  scoped_ptr<MetadataDatabase> metadata_database =
394      initializer->PassMetadataDatabase();
395  if (metadata_database)
396    context_->SetMetadataDatabase(metadata_database.Pass());
397
398  UpdateRegisteredApps();
399}
400
401void SyncWorker::UpdateRegisteredApps() {
402  MetadataDatabase* metadata_db = GetMetadataDatabase();
403  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
404  DCHECK(metadata_db);
405
406  scoped_ptr<std::vector<std::string> > app_ids(new std::vector<std::string>);
407  metadata_db->GetRegisteredAppIDs(app_ids.get());
408
409  AppStatusMap* app_status = new AppStatusMap;
410  base::Closure callback =
411      base::Bind(&SyncWorker::DidQueryAppStatus,
412                 weak_ptr_factory_.GetWeakPtr(),
413                 base::Owned(app_status));
414
415  context_->GetUITaskRunner()->PostTask(
416      FROM_HERE,
417      base::Bind(&SyncWorker::QueryAppStatusOnUIThread,
418                 extension_service_,
419                 base::Owned(app_ids.release()),
420                 app_status,
421                 RelayCallbackToTaskRunner(
422                     context_->GetWorkerTaskRunner(),
423                     FROM_HERE, callback)));
424}
425
426void SyncWorker::QueryAppStatusOnUIThread(
427    const base::WeakPtr<ExtensionServiceInterface>& extension_service_ptr,
428    const std::vector<std::string>* app_ids,
429    AppStatusMap* status,
430    const base::Closure& callback) {
431  ExtensionServiceInterface* extension_service = extension_service_ptr.get();
432  if (!extension_service) {
433    callback.Run();
434    return;
435  }
436
437  for (std::vector<std::string>::const_iterator itr = app_ids->begin();
438       itr != app_ids->end(); ++itr) {
439    const std::string& app_id = *itr;
440    if (!extension_service->GetInstalledExtension(app_id))
441      (*status)[app_id] = APP_STATUS_UNINSTALLED;
442    else if (!extension_service->IsExtensionEnabled(app_id))
443      (*status)[app_id] = APP_STATUS_DISABLED;
444    else
445      (*status)[app_id] = APP_STATUS_ENABLED;
446  }
447
448  callback.Run();
449}
450
451void SyncWorker::DidQueryAppStatus(const AppStatusMap* app_status) {
452  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
453
454  MetadataDatabase* metadata_db = GetMetadataDatabase();
455  DCHECK(metadata_db);
456
457  // Update the status of every origin using status from ExtensionService.
458  for (AppStatusMap::const_iterator itr = app_status->begin();
459       itr != app_status->end(); ++itr) {
460    const std::string& app_id = itr->first;
461    GURL origin = extensions::Extension::GetBaseURLFromExtensionId(app_id);
462
463    if (itr->second == APP_STATUS_UNINSTALLED) {
464      // Extension has been uninstalled.
465      // (At this stage we can't know if it was unpacked extension or not,
466      // so just purge the remote folder.)
467      UninstallOrigin(origin,
468                      RemoteFileSyncService::UNINSTALL_AND_PURGE_REMOTE,
469                      base::Bind(&EmptyStatusCallback));
470      continue;
471    }
472
473    FileTracker tracker;
474    if (!metadata_db->FindAppRootTracker(app_id, &tracker)) {
475      // App will register itself on first run.
476      continue;
477    }
478
479    DCHECK(itr->second == APP_STATUS_ENABLED ||
480           itr->second == APP_STATUS_DISABLED);
481    bool is_app_enabled = (itr->second == APP_STATUS_ENABLED);
482    bool is_app_root_tracker_enabled =
483        (tracker.tracker_kind() == TRACKER_KIND_APP_ROOT);
484    if (is_app_enabled && !is_app_root_tracker_enabled)
485      EnableOrigin(origin, base::Bind(&EmptyStatusCallback));
486    else if (!is_app_enabled && is_app_root_tracker_enabled)
487      DisableOrigin(origin, base::Bind(&EmptyStatusCallback));
488  }
489}
490
491void SyncWorker::DidProcessRemoteChange(RemoteToLocalSyncer* syncer,
492                                        const SyncFileCallback& callback,
493                                        SyncStatusCode status) {
494  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
495
496  if (syncer->is_sync_root_deletion()) {
497    MetadataDatabase::ClearDatabase(context_->PassMetadataDatabase());
498    PostInitializeTask();
499    callback.Run(status, syncer->url());
500    return;
501  }
502
503  if (status == SYNC_STATUS_OK) {
504    if (syncer->sync_action() != SYNC_ACTION_NONE &&
505        syncer->url().is_valid()) {
506      FOR_EACH_OBSERVER(
507          Observer, observers_,
508          OnFileStatusChanged(
509              syncer->url(),
510              SYNC_FILE_STATUS_SYNCED,
511              syncer->sync_action(),
512              SYNC_DIRECTION_REMOTE_TO_LOCAL));
513    }
514
515    if (syncer->sync_action() == SYNC_ACTION_DELETED &&
516        syncer->url().is_valid() &&
517        storage::VirtualPath::IsRootPath(syncer->url().path())) {
518      RegisterOrigin(syncer->url().origin(), base::Bind(&EmptyStatusCallback));
519    }
520    should_check_conflict_ = true;
521  }
522  callback.Run(status, syncer->url());
523}
524
525void SyncWorker::DidApplyLocalChange(LocalToRemoteSyncer* syncer,
526                                     const SyncStatusCallback& callback,
527                                     SyncStatusCode status) {
528  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
529
530  if ((status == SYNC_STATUS_OK || status == SYNC_STATUS_RETRY) &&
531      syncer->url().is_valid() &&
532      syncer->sync_action() != SYNC_ACTION_NONE) {
533    storage::FileSystemURL updated_url = syncer->url();
534    if (!syncer->target_path().empty()) {
535      updated_url = CreateSyncableFileSystemURL(syncer->url().origin(),
536                                                syncer->target_path());
537    }
538    FOR_EACH_OBSERVER(Observer, observers_,
539                      OnFileStatusChanged(updated_url,
540                                          SYNC_FILE_STATUS_SYNCED,
541                                          syncer->sync_action(),
542                                          SYNC_DIRECTION_LOCAL_TO_REMOTE));
543  }
544
545  if (status == SYNC_STATUS_UNKNOWN_ORIGIN && syncer->url().is_valid()) {
546    RegisterOrigin(syncer->url().origin(),
547                   base::Bind(&EmptyStatusCallback));
548  }
549
550  if (syncer->needs_remote_change_listing() &&
551      !listing_remote_changes_) {
552    task_manager_->ScheduleSyncTask(
553        FROM_HERE,
554        scoped_ptr<SyncTask>(new ListChangesTask(context_.get())),
555        SyncTaskManager::PRIORITY_HIGH,
556        base::Bind(&SyncWorker::DidFetchChanges,
557                   weak_ptr_factory_.GetWeakPtr()));
558    should_check_remote_change_ = false;
559    listing_remote_changes_ = true;
560    time_to_check_changes_ =
561        base::TimeTicks::Now() +
562        base::TimeDelta::FromSeconds(kListChangesRetryDelaySeconds);
563  }
564
565  if (status == SYNC_STATUS_OK)
566    should_check_conflict_ = true;
567
568  callback.Run(status);
569}
570
571bool SyncWorker::MaybeStartFetchChanges() {
572  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
573
574  if (GetCurrentState() == REMOTE_SERVICE_DISABLED)
575    return false;
576
577  if (!GetMetadataDatabase())
578    return false;
579
580  if (listing_remote_changes_)
581    return false;
582
583  base::TimeTicks now = base::TimeTicks::Now();
584  if (!should_check_remote_change_ && now < time_to_check_changes_) {
585    if (!GetMetadataDatabase()->HasDirtyTracker() &&
586        should_check_conflict_) {
587      should_check_conflict_ = false;
588      return task_manager_->ScheduleSyncTaskIfIdle(
589          FROM_HERE,
590          scoped_ptr<SyncTask>(new ConflictResolver(context_.get())),
591          base::Bind(&SyncWorker::DidResolveConflict,
592                     weak_ptr_factory_.GetWeakPtr()));
593    }
594    return false;
595  }
596
597  if (task_manager_->ScheduleSyncTaskIfIdle(
598          FROM_HERE,
599          scoped_ptr<SyncTask>(new ListChangesTask(context_.get())),
600          base::Bind(&SyncWorker::DidFetchChanges,
601                     weak_ptr_factory_.GetWeakPtr()))) {
602    should_check_remote_change_ = false;
603    listing_remote_changes_ = true;
604    time_to_check_changes_ =
605        now + base::TimeDelta::FromSeconds(kListChangesRetryDelaySeconds);
606    return true;
607  }
608  return false;
609}
610
611void SyncWorker::DidResolveConflict(SyncStatusCode status) {
612  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
613
614  if (status == SYNC_STATUS_OK)
615    should_check_conflict_ = true;
616}
617
618void SyncWorker::DidFetchChanges(SyncStatusCode status) {
619  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
620
621  if (status == SYNC_STATUS_OK)
622    should_check_conflict_ = true;
623  listing_remote_changes_ = false;
624}
625
626void SyncWorker::UpdateServiceStateFromSyncStatusCode(
627    SyncStatusCode status,
628    bool used_network) {
629  switch (status) {
630    case SYNC_STATUS_OK:
631      if (used_network)
632        UpdateServiceState(REMOTE_SERVICE_OK, std::string());
633      break;
634
635    // Authentication error.
636    case SYNC_STATUS_AUTHENTICATION_FAILED:
637      UpdateServiceState(REMOTE_SERVICE_AUTHENTICATION_REQUIRED,
638                         "Authentication required");
639      break;
640
641    // OAuth token error.
642    case SYNC_STATUS_ACCESS_FORBIDDEN:
643      UpdateServiceState(REMOTE_SERVICE_ACCESS_FORBIDDEN,
644                         "Access forbidden");
645      break;
646
647    // Errors which could make the service temporarily unavailable.
648    case SYNC_STATUS_SERVICE_TEMPORARILY_UNAVAILABLE:
649    case SYNC_STATUS_NETWORK_ERROR:
650    case SYNC_STATUS_ABORT:
651    case SYNC_STATUS_FAILED:
652      UpdateServiceState(REMOTE_SERVICE_TEMPORARY_UNAVAILABLE,
653                         "Network or temporary service error.");
654      break;
655
656    // Errors which would require manual user intervention to resolve.
657    case SYNC_DATABASE_ERROR_CORRUPTION:
658    case SYNC_DATABASE_ERROR_IO_ERROR:
659    case SYNC_DATABASE_ERROR_FAILED:
660      UpdateServiceState(REMOTE_SERVICE_DISABLED,
661                         "Unrecoverable database error");
662      break;
663
664    default:
665      // Other errors don't affect service state
666      break;
667  }
668}
669
670void SyncWorker::UpdateServiceState(RemoteServiceState state,
671                                    const std::string& description) {
672  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
673
674  RemoteServiceState old_state = GetCurrentState();
675  service_state_ = state;
676
677  if (old_state == GetCurrentState())
678    return;
679
680  util::Log(logging::LOG_VERBOSE, FROM_HERE,
681            "Service state changed: %d->%d: %s",
682            old_state, GetCurrentState(), description.c_str());
683
684  FOR_EACH_OBSERVER(
685      Observer, observers_,
686      UpdateServiceState(GetCurrentState(), description));
687}
688
689void SyncWorker::CallOnIdleForTesting(const base::Closure& callback) {
690  if (task_manager_->ScheduleTaskIfIdle(
691          FROM_HERE,
692          base::Bind(&InvokeIdleCallback, callback),
693          base::Bind(&EmptyStatusCallback)))
694    return;
695  call_on_idle_callback_ = base::Bind(
696      &SyncWorker::CallOnIdleForTesting,
697      weak_ptr_factory_.GetWeakPtr(),
698      callback);
699}
700
701drive::DriveServiceInterface* SyncWorker::GetDriveService() {
702  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
703  return context_->GetDriveService();
704}
705
706drive::DriveUploaderInterface* SyncWorker::GetDriveUploader() {
707  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
708  return context_->GetDriveUploader();
709}
710
711MetadataDatabase* SyncWorker::GetMetadataDatabase() {
712  DCHECK(sequence_checker_.CalledOnValidSequencedThread());
713  return context_->GetMetadataDatabase();
714}
715
716}  // namespace drive_backend
717}  // namespace sync_file_system
718