src/chrome/browser/sync_file_system/local/local_file_sync_service.cc

   1 // Copyright 2013 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/local/local_file_sync_service.h"
   6
   7 #include "base/single_thread_task_runner.h"
   8 #include "base/stl_util.h"
   9 #include "base/thread_task_runner_handle.h"
  10 #include "chrome/browser/extensions/extension_util.h"
  11 #include "chrome/browser/profiles/profile.h"
  12 #include "chrome/browser/sync_file_system/file_change.h"
  13 #include "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
  14 #include "chrome/browser/sync_file_system/local/local_file_sync_context.h"
  15 #include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
  16 #include "chrome/browser/sync_file_system/local_change_processor.h"
  17 #include "chrome/browser/sync_file_system/logger.h"
  18 #include "chrome/browser/sync_file_system/sync_file_metadata.h"
  19 #include "content/public/browser/browser_context.h"
  20 #include "content/public/browser/browser_thread.h"
  21 #include "content/public/browser/site_instance.h"
  22 #include "content/public/browser/storage_partition.h"
  23 #include "extensions/browser/extension_registry.h"
  24 #include "extensions/common/extension_set.h"
  25 #include "storage/browser/fileapi/file_system_context.h"
  26 #include "storage/browser/fileapi/file_system_url.h"
  27 #include "storage/common/blob/scoped_file.h"
  28 #include "url/gurl.h"
  29
  30 using content::BrowserThread;
  31 using storage::FileSystemURL;
  32
  33 namespace sync_file_system {
  34
  35 namespace {
  36
  37 void PrepareForProcessRemoteChangeCallbackAdapter(
  38     const RemoteChangeProcessor::PrepareChangeCallback& callback,
  39     SyncStatusCode status,
  40     const LocalFileSyncInfo& sync_file_info,
  41     storage::ScopedFile snapshot) {
  42   callback.Run(status, sync_file_info.metadata, sync_file_info.changes);
  43 }
  44
  45 void InvokeCallbackOnNthInvocation(int* count, const base::Closure& callback) {
  46   --*count;
  47   if (*count <= 0)
  48     callback.Run();
  49 }
  50
  51 }  // namespace
  52
  53 LocalFileSyncService::OriginChangeMap::OriginChangeMap()
  54     : next_(change_count_map_.end()) {}
  55 LocalFileSyncService::OriginChangeMap::~OriginChangeMap() {}
  56
  57 bool LocalFileSyncService::OriginChangeMap::NextOriginToProcess(GURL* origin) {
  58   DCHECK(origin);
  59   if (change_count_map_.empty())
  60     return false;
  61   Map::iterator begin = next_;
  62   do {
  63     if (next_ == change_count_map_.end())
  64       next_ = change_count_map_.begin();
  65     DCHECK_NE(0, next_->second);
  66     *origin = next_++->first;
  67     if (!ContainsKey(disabled_origins_, *origin))
  68       return true;
  69   } while (next_ != begin);
  70   return false;
  71 }
  72
  73 int64 LocalFileSyncService::OriginChangeMap::GetTotalChangeCount() const {
  74   int64 num_changes = 0;
  75   for (Map::const_iterator iter = change_count_map_.begin();
  76        iter != change_count_map_.end(); ++iter) {
  77     if (ContainsKey(disabled_origins_, iter->first))
  78       continue;
  79     num_changes += iter->second;
  80   }
  81   return num_changes;
  82 }
  83
  84 void LocalFileSyncService::OriginChangeMap::SetOriginChangeCount(
  85     const GURL& origin, int64 changes) {
  86   if (changes != 0) {
  87     change_count_map_[origin] = changes;
  88     return;
  89   }
  90   Map::iterator found = change_count_map_.find(origin);
  91   if (found != change_count_map_.end()) {
  92     if (next_ == found)
  93       ++next_;
  94     change_count_map_.erase(found);
  95   }
  96 }
  97
  98 void LocalFileSyncService::OriginChangeMap::SetOriginEnabled(
  99     const GURL& origin, bool enabled) {
 100   if (enabled)
 101     disabled_origins_.erase(origin);
 102   else
 103     disabled_origins_.insert(origin);
 104 }
 105
 106 // LocalFileSyncService -------------------------------------------------------
 107
 108 scoped_ptr<LocalFileSyncService> LocalFileSyncService::Create(
 109     Profile* profile) {
 110   return make_scoped_ptr(new LocalFileSyncService(profile, nullptr));
 111 }
 112
 113 scoped_ptr<LocalFileSyncService> LocalFileSyncService::CreateForTesting(
 114     Profile* profile,
 115     leveldb::Env* env) {
 116   scoped_ptr<LocalFileSyncService> sync_service(
 117       new LocalFileSyncService(profile, env));
 118   sync_service->sync_context_->set_mock_notify_changes_duration_in_sec(0);
 119   return sync_service.Pass();
 120 }
 121
 122 LocalFileSyncService::~LocalFileSyncService() {
 123   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 124 }
 125
 126 void LocalFileSyncService::Shutdown() {
 127   sync_context_->RemoveOriginChangeObserver(this);
 128   sync_context_->ShutdownOnUIThread();
 129   profile_ = nullptr;
 130 }
 131
 132 void LocalFileSyncService::MaybeInitializeFileSystemContext(
 133     const GURL& app_origin,
 134     storage::FileSystemContext* file_system_context,
 135     const SyncStatusCallback& callback) {
 136   sync_context_->MaybeInitializeFileSystemContext(
 137       app_origin, file_system_context,
 138       base::Bind(&LocalFileSyncService::DidInitializeFileSystemContext,
 139                  AsWeakPtr(), app_origin,
 140                  make_scoped_refptr(file_system_context), callback));
 141 }
 142
 143 void LocalFileSyncService::AddChangeObserver(Observer* observer) {
 144   change_observers_.AddObserver(observer);
 145 }
 146
 147 void LocalFileSyncService::RegisterURLForWaitingSync(
 148     const FileSystemURL& url,
 149     const base::Closure& on_syncable_callback) {
 150   sync_context_->RegisterURLForWaitingSync(url, on_syncable_callback);
 151 }
 152
 153 void LocalFileSyncService::ProcessLocalChange(
 154     const SyncFileCallback& callback) {
 155   // Pick an origin to process next.
 156   GURL origin;
 157   if (!origin_change_map_.NextOriginToProcess(&origin)) {
 158     callback.Run(SYNC_STATUS_NO_CHANGE_TO_SYNC, FileSystemURL());
 159     return;
 160   }
 161   DCHECK(!origin.is_empty());
 162   DCHECK(ContainsKey(origin_to_contexts_, origin));
 163
 164   DVLOG(1) << "Starting ProcessLocalChange";
 165
 166   sync_context_->GetFileForLocalSync(
 167       origin_to_contexts_[origin],
 168       base::Bind(&LocalFileSyncService::DidGetFileForLocalSync,
 169                  AsWeakPtr(), callback));
 170 }
 171
 172 void LocalFileSyncService::SetLocalChangeProcessor(
 173     LocalChangeProcessor* local_change_processor) {
 174   local_change_processor_ = local_change_processor;
 175 }
 176
 177 void LocalFileSyncService::SetLocalChangeProcessorCallback(
 178     const GetLocalChangeProcessorCallback& get_local_change_processor) {
 179   get_local_change_processor_ = get_local_change_processor;
 180 }
 181
 182 void LocalFileSyncService::HasPendingLocalChanges(
 183     const FileSystemURL& url,
 184     const HasPendingLocalChangeCallback& callback) {
 185   if (!ContainsKey(origin_to_contexts_, url.origin())) {
 186     base::ThreadTaskRunnerHandle::Get()->PostTask(
 187         FROM_HERE,
 188         base::Bind(callback, SYNC_FILE_ERROR_INVALID_URL, false));
 189     return;
 190   }
 191   sync_context_->HasPendingLocalChanges(
 192       origin_to_contexts_[url.origin()], url, callback);
 193 }
 194
 195 void LocalFileSyncService::PromoteDemotedChanges(
 196     const base::Closure& callback) {
 197   if (origin_to_contexts_.empty()) {
 198     callback.Run();
 199     return;
 200   }
 201
 202   base::Closure completion_callback =
 203       base::Bind(&InvokeCallbackOnNthInvocation,
 204                  base::Owned(new int(origin_to_contexts_.size() + 1)),
 205                  callback);
 206   for (OriginToContext::iterator iter = origin_to_contexts_.begin();
 207        iter != origin_to_contexts_.end(); ++iter)
 208     sync_context_->PromoteDemotedChanges(iter->first, iter->second,
 209                                          completion_callback);
 210   completion_callback.Run();
 211 }
 212
 213 void LocalFileSyncService::GetLocalFileMetadata(
 214     const FileSystemURL& url, const SyncFileMetadataCallback& callback) {
 215   DCHECK(ContainsKey(origin_to_contexts_, url.origin()));
 216   sync_context_->GetFileMetadata(origin_to_contexts_[url.origin()],
 217                                  url, callback);
 218 }
 219
 220 void LocalFileSyncService::PrepareForProcessRemoteChange(
 221     const FileSystemURL& url,
 222     const PrepareChangeCallback& callback) {
 223   DVLOG(1) << "PrepareForProcessRemoteChange: " << url.DebugString();
 224
 225   if (!ContainsKey(origin_to_contexts_, url.origin())) {
 226     // This could happen if a remote sync is triggered for the app that hasn't
 227     // been initialized in this service.
 228     DCHECK(profile_);
 229     // The given url.origin() must be for valid installed app.
 230     const extensions::Extension* extension =
 231         extensions::ExtensionRegistry::Get(profile_)
 232             ->enabled_extensions().GetAppByURL(url.origin());
 233     if (!extension) {
 234       util::Log(
 235           logging::LOG_WARNING,
 236           FROM_HERE,
 237           "PrepareForProcessRemoteChange called for non-existing origin: %s",
 238           url.origin().spec().c_str());
 239
 240       // The extension has been uninstalled and this method is called
 241       // before the remote changes for the origin are removed.
 242       callback.Run(SYNC_STATUS_NO_CHANGE_TO_SYNC,
 243                    SyncFileMetadata(), FileChangeList());
 244       return;
 245     }
 246     GURL site_url =
 247         extensions::util::GetSiteForExtensionId(extension->id(), profile_);
 248     DCHECK(!site_url.is_empty());
 249     scoped_refptr<storage::FileSystemContext> file_system_context =
 250         content::BrowserContext::GetStoragePartitionForSite(profile_, site_url)
 251             ->GetFileSystemContext();
 252     MaybeInitializeFileSystemContext(
 253         url.origin(),
 254         file_system_context.get(),
 255         base::Bind(&LocalFileSyncService::DidInitializeForRemoteSync,
 256                    AsWeakPtr(),
 257                    url,
 258                    file_system_context,
 259                    callback));
 260     return;
 261   }
 262
 263   DCHECK(ContainsKey(origin_to_contexts_, url.origin()));
 264   sync_context_->PrepareForSync(
 265       origin_to_contexts_[url.origin()], url,
 266       LocalFileSyncContext::SYNC_EXCLUSIVE,
 267       base::Bind(&PrepareForProcessRemoteChangeCallbackAdapter, callback));
 268 }
 269
 270 void LocalFileSyncService::ApplyRemoteChange(
 271     const FileChange& change,
 272     const base::FilePath& local_path,
 273     const FileSystemURL& url,
 274     const SyncStatusCallback& callback) {
 275   DCHECK(ContainsKey(origin_to_contexts_, url.origin()));
 276   util::Log(logging::LOG_VERBOSE, FROM_HERE,
 277             "[Remote -> Local] ApplyRemoteChange: %s on %s",
 278             change.DebugString().c_str(),
 279             url.DebugString().c_str());
 280
 281   sync_context_->ApplyRemoteChange(
 282       origin_to_contexts_[url.origin()],
 283       change, local_path, url,
 284       base::Bind(&LocalFileSyncService::DidApplyRemoteChange, AsWeakPtr(),
 285                  callback));
 286 }
 287
 288 void LocalFileSyncService::FinalizeRemoteSync(
 289     const FileSystemURL& url,
 290     bool clear_local_changes,
 291     const base::Closure& completion_callback) {
 292   DCHECK(ContainsKey(origin_to_contexts_, url.origin()));
 293   sync_context_->FinalizeExclusiveSync(
 294       origin_to_contexts_[url.origin()],
 295       url, clear_local_changes, completion_callback);
 296 }
 297
 298 void LocalFileSyncService::RecordFakeLocalChange(
 299     const FileSystemURL& url,
 300     const FileChange& change,
 301     const SyncStatusCallback& callback) {
 302   DCHECK(ContainsKey(origin_to_contexts_, url.origin()));
 303   sync_context_->RecordFakeLocalChange(origin_to_contexts_[url.origin()],
 304                                        url, change, callback);
 305 }
 306
 307 void LocalFileSyncService::OnChangesAvailableInOrigins(
 308     const std::set<GURL>& origins) {
 309   bool need_notification = false;
 310   for (std::set<GURL>::const_iterator iter = origins.begin();
 311        iter != origins.end(); ++iter) {
 312     const GURL& origin = *iter;
 313     if (!ContainsKey(origin_to_contexts_, origin)) {
 314       // This could happen if this is called for apps/origins that haven't
 315       // been initialized yet, or for apps/origins that are disabled.
 316       // (Local change tracker could call this for uninitialized origins
 317       // while it's reading dirty files from the database in the
 318       // initialization phase.)
 319       pending_origins_with_changes_.insert(origin);
 320       continue;
 321     }
 322     need_notification = true;
 323     SyncFileSystemBackend* backend =
 324         SyncFileSystemBackend::GetBackend(origin_to_contexts_[origin]);
 325     DCHECK(backend);
 326     DCHECK(backend->change_tracker());
 327     origin_change_map_.SetOriginChangeCount(
 328         origin, backend->change_tracker()->num_changes());
 329   }
 330   if (!need_notification)
 331     return;
 332   int64 num_changes = origin_change_map_.GetTotalChangeCount();
 333   FOR_EACH_OBSERVER(Observer, change_observers_,
 334                     OnLocalChangeAvailable(num_changes));
 335 }
 336
 337 void LocalFileSyncService::SetOriginEnabled(const GURL& origin, bool enabled) {
 338   if (!ContainsKey(origin_to_contexts_, origin))
 339     return;
 340   origin_change_map_.SetOriginEnabled(origin, enabled);
 341 }
 342
 343 LocalFileSyncService::LocalFileSyncService(Profile* profile,
 344                                            leveldb::Env* env_override)
 345     : profile_(profile),
 346       sync_context_(new LocalFileSyncContext(
 347           profile_->GetPath(),
 348           env_override,
 349           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::UI).get(),
 350           BrowserThread::GetMessageLoopProxyForThread(BrowserThread::IO)
 351               .get())),
 352       local_change_processor_(nullptr) {
 353   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 354   sync_context_->AddOriginChangeObserver(this);
 355 }
 356
 357 void LocalFileSyncService::DidInitializeFileSystemContext(
 358     const GURL& app_origin,
 359     storage::FileSystemContext* file_system_context,
 360     const SyncStatusCallback& callback,
 361     SyncStatusCode status) {
 362   if (status != SYNC_STATUS_OK) {
 363     callback.Run(status);
 364     return;
 365   }
 366   DCHECK(file_system_context);
 367   origin_to_contexts_[app_origin] = file_system_context;
 368
 369   if (pending_origins_with_changes_.find(app_origin) !=
 370       pending_origins_with_changes_.end()) {
 371     // We have remaining changes for the origin.
 372     pending_origins_with_changes_.erase(app_origin);
 373     SyncFileSystemBackend* backend =
 374         SyncFileSystemBackend::GetBackend(file_system_context);
 375     DCHECK(backend);
 376     DCHECK(backend->change_tracker());
 377     origin_change_map_.SetOriginChangeCount(
 378         app_origin, backend->change_tracker()->num_changes());
 379     int64 num_changes = origin_change_map_.GetTotalChangeCount();
 380     FOR_EACH_OBSERVER(Observer, change_observers_,
 381                       OnLocalChangeAvailable(num_changes));
 382   }
 383   callback.Run(status);
 384 }
 385
 386 void LocalFileSyncService::DidInitializeForRemoteSync(
 387     const FileSystemURL& url,
 388     storage::FileSystemContext* file_system_context,
 389     const PrepareChangeCallback& callback,
 390     SyncStatusCode status) {
 391   if (status != SYNC_STATUS_OK) {
 392     DVLOG(1) << "FileSystemContext initialization failed for remote sync:"
 393              << url.DebugString() << " status=" << status
 394              << " (" << SyncStatusCodeToString(status) << ")";
 395     callback.Run(status, SyncFileMetadata(), FileChangeList());
 396     return;
 397   }
 398   origin_to_contexts_[url.origin()] = file_system_context;
 399   PrepareForProcessRemoteChange(url, callback);
 400 }
 401
 402 void LocalFileSyncService::DidApplyRemoteChange(
 403     const SyncStatusCallback& callback,
 404     SyncStatusCode status) {
 405   util::Log(logging::LOG_VERBOSE, FROM_HERE,
 406             "[Remote -> Local] ApplyRemoteChange finished --> %s",
 407             SyncStatusCodeToString(status));
 408   callback.Run(status);
 409 }
 410
 411 void LocalFileSyncService::DidGetFileForLocalSync(
 412     const SyncFileCallback& callback,
 413     SyncStatusCode status,
 414     const LocalFileSyncInfo& sync_file_info,
 415     storage::ScopedFile snapshot) {
 416   if (status != SYNC_STATUS_OK) {
 417     callback.Run(status, sync_file_info.url);
 418     return;
 419   }
 420   if (sync_file_info.changes.empty()) {
 421     // There's a slight chance this could happen.
 422     ProcessLocalChange(callback);
 423     return;
 424   }
 425
 426   FileChange next_change = sync_file_info.changes.front();
 427   DVLOG(1) << "ProcessLocalChange: " << sync_file_info.url.DebugString()
 428            << " change:" << next_change.DebugString();
 429
 430   GetLocalChangeProcessor(sync_file_info.url)->ApplyLocalChange(
 431       next_change,
 432       sync_file_info.local_file_path,
 433       sync_file_info.metadata,
 434       sync_file_info.url,
 435       base::Bind(&LocalFileSyncService::ProcessNextChangeForURL,
 436                  AsWeakPtr(), callback,
 437                  base::Passed(&snapshot), sync_file_info,
 438                  next_change, sync_file_info.changes.PopAndGetNewList()));
 439 }
 440
 441 void LocalFileSyncService::ProcessNextChangeForURL(
 442     const SyncFileCallback& callback,
 443     storage::ScopedFile snapshot,
 444     const LocalFileSyncInfo& sync_file_info,
 445     const FileChange& processed_change,
 446     const FileChangeList& changes,
 447     SyncStatusCode status) {
 448   DVLOG(1) << "Processed one local change: "
 449            << sync_file_info.url.DebugString()
 450            << " change:" << processed_change.DebugString()
 451            << " status:" << status;
 452
 453   if (status == SYNC_STATUS_RETRY) {
 454     GetLocalChangeProcessor(sync_file_info.url)->ApplyLocalChange(
 455         processed_change,
 456         sync_file_info.local_file_path,
 457         sync_file_info.metadata,
 458         sync_file_info.url,
 459         base::Bind(&LocalFileSyncService::ProcessNextChangeForURL,
 460                    AsWeakPtr(), callback, base::Passed(&snapshot),
 461                    sync_file_info, processed_change, changes));
 462     return;
 463   }
 464
 465   if (status == SYNC_FILE_ERROR_NOT_FOUND &&
 466       processed_change.change() == FileChange::FILE_CHANGE_DELETE) {
 467     // This must be ok (and could happen).
 468     status = SYNC_STATUS_OK;
 469   }
 470
 471   const FileSystemURL& url = sync_file_info.url;
 472   if (status != SYNC_STATUS_OK || changes.empty()) {
 473     DCHECK(ContainsKey(origin_to_contexts_, url.origin()));
 474     sync_context_->FinalizeSnapshotSync(
 475         origin_to_contexts_[url.origin()], url, status,
 476         base::Bind(callback, status, url));
 477     return;
 478   }
 479
 480   FileChange next_change = changes.front();
 481   GetLocalChangeProcessor(url)->ApplyLocalChange(
 482       changes.front(),
 483       sync_file_info.local_file_path,
 484       sync_file_info.metadata,
 485       url,
 486       base::Bind(&LocalFileSyncService::ProcessNextChangeForURL,
 487                  AsWeakPtr(), callback,
 488                  base::Passed(&snapshot), sync_file_info,
 489                  next_change, changes.PopAndGetNewList()));
 490 }
 491
 492 LocalChangeProcessor* LocalFileSyncService::GetLocalChangeProcessor(
 493     const FileSystemURL& url) {
 494   if (!get_local_change_processor_.is_null())
 495     return get_local_change_processor_.Run(url.origin());
 496   DCHECK(local_change_processor_);
 497   return local_change_processor_;
 498 }
 499
 500 }  // namespace sync_file_system