sync/engine/commit_util.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 "sync/engine/commit_util.h"
   6
   7 #include <limits>
   8 #include <set>
   9 #include <string>
  10 #include <vector>
  11
  12 #include "base/strings/string_util.h"
  13 #include "sync/engine/syncer_proto_util.h"
  14 #include "sync/internal_api/public/base/attachment_id_proto.h"
  15 #include "sync/internal_api/public/base/unique_position.h"
  16 #include "sync/protocol/bookmark_specifics.pb.h"
  17 #include "sync/protocol/sync.pb.h"
  18 #include "sync/sessions/sync_session.h"
  19 #include "sync/syncable/directory.h"
  20 #include "sync/syncable/entry.h"
  21 #include "sync/syncable/model_neutral_mutable_entry.h"
  22 #include "sync/syncable/syncable_base_transaction.h"
  23 #include "sync/syncable/syncable_base_write_transaction.h"
  24 #include "sync/syncable/syncable_changes_version.h"
  25 #include "sync/syncable/syncable_proto_util.h"
  26 #include "sync/syncable/syncable_util.h"
  27 #include "sync/util/time.h"
  28
  29 using std::set;
  30 using std::string;
  31 using std::vector;
  32
  33 namespace syncer {
  34
  35 using sessions::SyncSession;
  36 using syncable::Entry;
  37 using syncable::IS_DEL;
  38 using syncable::IS_UNAPPLIED_UPDATE;
  39 using syncable::IS_UNSYNCED;
  40 using syncable::Id;
  41 using syncable::SPECIFICS;
  42 using syncable::UNIQUE_POSITION;
  43
  44 namespace commit_util {
  45
  46 void AddExtensionsActivityToMessage(
  47     ExtensionsActivity* activity,
  48     ExtensionsActivity::Records* extensions_activity_buffer,
  49     sync_pb::CommitMessage* message) {
  50   // This isn't perfect, since the set of extensions activity may not correlate
  51   // exactly with the items being committed.  That's OK as long as we're looking
  52   // for a rough estimate of extensions activity, not an precise mapping of
  53   // which commits were triggered by which extension.
  54   //
  55   // We will push this list of extensions activity back into the
  56   // ExtensionsActivityMonitor if this commit fails.  That's why we must keep a
  57   // copy of these records in the session.
  58   activity->GetAndClearRecords(extensions_activity_buffer);
  59
  60   const ExtensionsActivity::Records& records = *extensions_activity_buffer;
  61   for (ExtensionsActivity::Records::const_iterator it =
  62        records.begin();
  63        it != records.end(); ++it) {
  64     sync_pb::ChromiumExtensionsActivity* activity_message =
  65         message->add_extensions_activity();
  66     activity_message->set_extension_id(it->second.extension_id);
  67     activity_message->set_bookmark_writes_since_last_commit(
  68         it->second.bookmark_write_count);
  69   }
  70 }
  71
  72 void AddClientConfigParamsToMessage(
  73     ModelTypeSet enabled_types,
  74     sync_pb::CommitMessage* message) {
  75   sync_pb::ClientConfigParams* config_params = message->mutable_config_params();
  76   for (ModelTypeSet::Iterator it = enabled_types.First(); it.Good(); it.Inc()) {
  77     if (ProxyTypes().Has(it.Get()))
  78       continue;
  79     int field_number = GetSpecificsFieldNumberFromModelType(it.Get());
  80     config_params->mutable_enabled_type_ids()->Add(field_number);
  81   }
  82   config_params->set_tabs_datatype_enabled(
  83       enabled_types.Has(syncer::PROXY_TABS));
  84 }
  85
  86 namespace {
  87
  88 void SetEntrySpecifics(const Entry& meta_entry,
  89                        sync_pb::SyncEntity* sync_entry) {
  90   // Add the new style extension and the folder bit.
  91   sync_entry->mutable_specifics()->CopyFrom(meta_entry.GetSpecifics());
  92   sync_entry->set_folder(meta_entry.GetIsDir());
  93
  94   CHECK(!sync_entry->specifics().password().has_client_only_encrypted_data());
  95   DCHECK_EQ(meta_entry.GetModelType(), GetModelType(*sync_entry));
  96 }
  97
  98 void SetAttachmentIds(const Entry& meta_entry,
  99                       sync_pb::SyncEntity* sync_entry) {
 100   const sync_pb::AttachmentMetadata& attachment_metadata =
 101       meta_entry.GetAttachmentMetadata();
 102   for (int i = 0; i < attachment_metadata.record_size(); ++i) {
 103     *sync_entry->add_attachment_id() = attachment_metadata.record(i).id();
 104   }
 105 }
 106
 107 }  // namespace
 108
 109 void BuildCommitItem(
 110     const syncable::Entry& meta_entry,
 111     sync_pb::SyncEntity* sync_entry) {
 112   syncable::Id id = meta_entry.GetId();
 113   sync_entry->set_id_string(SyncableIdToProto(id));
 114
 115   string name = meta_entry.GetNonUniqueName();
 116   CHECK(!name.empty());  // Make sure this isn't an update.
 117   // Note: Truncation is also performed in WriteNode::SetTitle(..). But this
 118   // call is still necessary to handle any title changes that might originate
 119   // elsewhere, or already be persisted in the directory.
 120   base::TruncateUTF8ToByteSize(name, 255, &name);
 121   sync_entry->set_name(name);
 122
 123   // Set the non_unique_name.  If we do, the server ignores
 124   // the |name| value (using |non_unique_name| instead), and will return
 125   // in the CommitResponse a unique name if one is generated.
 126   // We send both because it may aid in logging.
 127   sync_entry->set_non_unique_name(name);
 128
 129   if (!meta_entry.GetUniqueClientTag().empty()) {
 130     sync_entry->set_client_defined_unique_tag(
 131         meta_entry.GetUniqueClientTag());
 132   }
 133
 134   // Deleted items with server-unknown parent ids can be a problem so we set
 135   // the parent to 0. (TODO(sync): Still true in protocol?).
 136   Id new_parent_id;
 137   if (meta_entry.GetIsDel() &&
 138       !meta_entry.GetParentId().ServerKnows()) {
 139     new_parent_id = syncable::BaseTransaction::root_id();
 140   } else {
 141     new_parent_id = meta_entry.GetParentId();
 142   }
 143
 144   if (meta_entry.ShouldMaintainHierarchy()) {
 145     sync_entry->set_parent_id_string(SyncableIdToProto(new_parent_id));
 146   }
 147
 148   // If our parent has changed, send up the old one so the server
 149   // can correctly deal with multiple parents.
 150   // TODO(nick): With the server keeping track of the primary sync parent,
 151   // it should not be necessary to provide the old_parent_id: the version
 152   // number should suffice.
 153   if (new_parent_id != meta_entry.GetServerParentId() &&
 154       0 != meta_entry.GetBaseVersion() &&
 155       syncable::CHANGES_VERSION != meta_entry.GetBaseVersion()) {
 156     sync_entry->set_old_parent_id(
 157         SyncableIdToProto(meta_entry.GetServerParentId()));
 158   }
 159
 160   int64 version = meta_entry.GetBaseVersion();
 161   if (syncable::CHANGES_VERSION == version || 0 == version) {
 162     // Undeletions are only supported for items that have a client tag.
 163     DCHECK(!id.ServerKnows() ||
 164            !meta_entry.GetUniqueClientTag().empty())
 165         << meta_entry;
 166
 167     // Version 0 means to create or undelete an object.
 168     sync_entry->set_version(0);
 169   } else {
 170     DCHECK(id.ServerKnows()) << meta_entry;
 171     sync_entry->set_version(meta_entry.GetBaseVersion());
 172   }
 173   sync_entry->set_ctime(TimeToProtoTime(meta_entry.GetCtime()));
 174   sync_entry->set_mtime(TimeToProtoTime(meta_entry.GetMtime()));
 175
 176   SetAttachmentIds(meta_entry, sync_entry);
 177
 178   // Handle bookmarks separately.
 179   if (meta_entry.GetSpecifics().has_bookmark()) {
 180     if (meta_entry.GetIsDel()) {
 181       sync_entry->set_deleted(true);
 182     } else {
 183       // Both insert_after_item_id and position_in_parent fields are set only
 184       // for legacy reasons.  See comments in sync.proto for more information.
 185       const Id& prev_id = meta_entry.GetPredecessorId();
 186       string prev_id_string =
 187           prev_id.IsRoot() ? string() : prev_id.GetServerId();
 188       sync_entry->set_insert_after_item_id(prev_id_string);
 189       sync_entry->set_position_in_parent(
 190           meta_entry.GetUniquePosition().ToInt64());
 191       meta_entry.GetUniquePosition().ToProto(
 192           sync_entry->mutable_unique_position());
 193     }
 194     // Always send specifics for bookmarks.
 195     SetEntrySpecifics(meta_entry, sync_entry);
 196     return;
 197   }
 198
 199   // Deletion is final on the server, let's move things and then delete them.
 200   if (meta_entry.GetIsDel()) {
 201     sync_entry->set_deleted(true);
 202
 203     sync_pb::EntitySpecifics type_only_specifics;
 204     AddDefaultFieldValue(meta_entry.GetModelType(),
 205                          sync_entry->mutable_specifics());
 206   } else {
 207     SetEntrySpecifics(meta_entry, sync_entry);
 208   }
 209 }
 210
 211 // Helpers for ProcessSingleCommitResponse.
 212 namespace {
 213
 214 void LogServerError(const sync_pb::CommitResponse_EntryResponse& res) {
 215   if (res.has_error_message())
 216     LOG(WARNING) << "  " << res.error_message();
 217   else
 218     LOG(WARNING) << "  No detailed error message returned from server";
 219 }
 220
 221 const string& GetResultingPostCommitName(
 222     const sync_pb::SyncEntity& committed_entry,
 223     const sync_pb::CommitResponse_EntryResponse& entry_response) {
 224   const string& response_name =
 225       SyncerProtoUtil::NameFromCommitEntryResponse(entry_response);
 226   if (!response_name.empty())
 227     return response_name;
 228   return SyncerProtoUtil::NameFromSyncEntity(committed_entry);
 229 }
 230
 231 bool UpdateVersionAfterCommit(
 232     const sync_pb::SyncEntity& committed_entry,
 233     const sync_pb::CommitResponse_EntryResponse& entry_response,
 234     const syncable::Id& pre_commit_id,
 235     syncable::ModelNeutralMutableEntry* local_entry) {
 236   int64 old_version = local_entry->GetBaseVersion();
 237   int64 new_version = entry_response.version();
 238   bool bad_commit_version = false;
 239   if (committed_entry.deleted() &&
 240       !local_entry->GetUniqueClientTag().empty()) {
 241     // If the item was deleted, and it's undeletable (uses the client tag),
 242     // change the version back to zero.  We must set the version to zero so
 243     // that the server knows to re-create the item if it gets committed
 244     // later for undeletion.
 245     new_version = 0;
 246   } else if (!pre_commit_id.ServerKnows()) {
 247     bad_commit_version = 0 == new_version;
 248   } else {
 249     bad_commit_version = old_version > new_version;
 250   }
 251   if (bad_commit_version) {
 252     LOG(ERROR) << "Bad version in commit return for " << *local_entry
 253                << " new_id:" << SyncableIdFromProto(entry_response.id_string())
 254                << " new_version:" << entry_response.version();
 255     return false;
 256   }
 257
 258   // Update the base version and server version.  The base version must change
 259   // here, even if syncing_was_set is false; that's because local changes were
 260   // on top of the successfully committed version.
 261   local_entry->PutBaseVersion(new_version);
 262   DVLOG(1) << "Commit is changing base version of " << local_entry->GetId()
 263            << " to: " << new_version;
 264   local_entry->PutServerVersion(new_version);
 265   return true;
 266 }
 267
 268 bool ChangeIdAfterCommit(
 269     const sync_pb::CommitResponse_EntryResponse& entry_response,
 270     const syncable::Id& pre_commit_id,
 271     syncable::ModelNeutralMutableEntry* local_entry) {
 272   syncable::BaseWriteTransaction* trans = local_entry->base_write_transaction();
 273   const syncable::Id& entry_response_id =
 274       SyncableIdFromProto(entry_response.id_string());
 275   if (entry_response_id != pre_commit_id) {
 276     if (pre_commit_id.ServerKnows()) {
 277       // The server can sometimes generate a new ID on commit; for example,
 278       // when committing an undeletion.
 279       DVLOG(1) << " ID changed while committing an old entry. "
 280                << pre_commit_id << " became " << entry_response_id << ".";
 281     }
 282     syncable::ModelNeutralMutableEntry same_id(
 283         trans,
 284         syncable::GET_BY_ID,
 285         entry_response_id);
 286     // We should trap this before this function.
 287     if (same_id.good()) {
 288       LOG(ERROR) << "ID clash with id " << entry_response_id
 289                  << " during commit " << same_id;
 290       return false;
 291     }
 292     ChangeEntryIDAndUpdateChildren(trans, local_entry, entry_response_id);
 293     DVLOG(1) << "Changing ID to " << entry_response_id;
 294   }
 295   return true;
 296 }
 297
 298 void UpdateServerFieldsAfterCommit(
 299     const sync_pb::SyncEntity& committed_entry,
 300     const sync_pb::CommitResponse_EntryResponse& entry_response,
 301     syncable::ModelNeutralMutableEntry* local_entry) {
 302
 303   // We just committed an entry successfully, and now we want to make our view
 304   // of the server state consistent with the server state. We must be careful;
 305   // |entry_response| and |committed_entry| have some identically named
 306   // fields.  We only want to consider fields from |committed_entry| when there
 307   // is not an overriding field in the |entry_response|.  We do not want to
 308   // update the server data from the local data in the entry -- it's possible
 309   // that the local data changed during the commit, and even if not, the server
 310   // has the last word on the values of several properties.
 311
 312   local_entry->PutServerIsDel(committed_entry.deleted());
 313   if (committed_entry.deleted()) {
 314     // Don't clobber any other fields of deleted objects.
 315     return;
 316   }
 317
 318   local_entry->PutServerIsDir(
 319       (committed_entry.folder() ||
 320        committed_entry.bookmarkdata().bookmark_folder()));
 321   local_entry->PutServerSpecifics(committed_entry.specifics());
 322   local_entry->PutServerAttachmentMetadata(
 323       CreateAttachmentMetadata(committed_entry.attachment_id()));
 324   local_entry->PutServerMtime(ProtoTimeToTime(committed_entry.mtime()));
 325   local_entry->PutServerCtime(ProtoTimeToTime(committed_entry.ctime()));
 326   if (committed_entry.has_unique_position()) {
 327     local_entry->PutServerUniquePosition(
 328                      UniquePosition::FromProto(
 329                          committed_entry.unique_position()));
 330   }
 331
 332   // TODO(nick): The server doesn't set entry_response.server_parent_id in
 333   // practice; to update SERVER_PARENT_ID appropriately here we'd need to
 334   // get the post-commit ID of the parent indicated by
 335   // committed_entry.parent_id_string(). That should be inferrable from the
 336   // information we have, but it's a bit convoluted to pull it out directly.
 337   // Getting this right is important: SERVER_PARENT_ID gets fed back into
 338   // old_parent_id during the next commit.
 339   local_entry->PutServerParentId(local_entry->GetParentId());
 340   local_entry->PutServerNonUniqueName(
 341       GetResultingPostCommitName(committed_entry, entry_response));
 342
 343   if (local_entry->GetIsUnappliedUpdate()) {
 344     // This shouldn't happen; an unapplied update shouldn't be committed, and
 345     // if it were, the commit should have failed.  But if it does happen: we've
 346     // just overwritten the update info, so clear the flag.
 347     local_entry->PutIsUnappliedUpdate(false);
 348   }
 349 }
 350
 351 void ProcessSuccessfulCommitResponse(
 352     const sync_pb::SyncEntity& committed_entry,
 353     const sync_pb::CommitResponse_EntryResponse& entry_response,
 354     const syncable::Id& pre_commit_id,
 355     syncable::ModelNeutralMutableEntry* local_entry,
 356     bool syncing_was_set, set<syncable::Id>* deleted_folders) {
 357   DCHECK(local_entry->GetIsUnsynced());
 358
 359   // Update SERVER_VERSION and BASE_VERSION.
 360   if (!UpdateVersionAfterCommit(committed_entry, entry_response, pre_commit_id,
 361                                 local_entry)) {
 362     LOG(ERROR) << "Bad version in commit return for " << *local_entry
 363                << " new_id:" << SyncableIdFromProto(entry_response.id_string())
 364                << " new_version:" << entry_response.version();
 365     return;
 366   }
 367
 368   // If the server gave us a new ID, apply it.
 369   if (!ChangeIdAfterCommit(entry_response, pre_commit_id, local_entry)) {
 370     return;
 371   }
 372
 373   // Update our stored copy of the server state.
 374   UpdateServerFieldsAfterCommit(committed_entry, entry_response, local_entry);
 375
 376   // If the item doesn't need to be committed again (an item might need to be
 377   // committed again if it changed locally during the commit), we can remove
 378   // it from the unsynced list.
 379   if (syncing_was_set) {
 380     local_entry->PutIsUnsynced(false);
 381   }
 382
 383   // Make a note of any deleted folders, whose children would have
 384   // been recursively deleted.
 385   // TODO(nick): Here, commit_message.deleted() would be more correct than
 386   // local_entry->GetIsDel().  For example, an item could be renamed, and then
 387   // deleted during the commit of the rename.  Unit test & fix.
 388   if (local_entry->GetIsDir() && local_entry->GetIsDel()) {
 389     deleted_folders->insert(local_entry->GetId());
 390   }
 391 }
 392
 393 }  // namespace
 394
 395 sync_pb::CommitResponse::ResponseType
 396 ProcessSingleCommitResponse(
 397     syncable::BaseWriteTransaction* trans,
 398     const sync_pb::CommitResponse_EntryResponse& server_entry,
 399     const sync_pb::SyncEntity& commit_request_entry,
 400     int64 metahandle,
 401     set<syncable::Id>* deleted_folders) {
 402   syncable::ModelNeutralMutableEntry local_entry(
 403       trans,
 404       syncable::GET_BY_HANDLE,
 405       metahandle);
 406   CHECK(local_entry.good());
 407   bool syncing_was_set = local_entry.GetSyncing();
 408   local_entry.PutSyncing(false);
 409
 410   sync_pb::CommitResponse::ResponseType response = server_entry.response_type();
 411   if (!sync_pb::CommitResponse::ResponseType_IsValid(response)) {
 412     LOG(ERROR) << "Commit response has unknown response type! Possibly out "
 413                "of date client?";
 414     return sync_pb::CommitResponse::INVALID_MESSAGE;
 415   }
 416   if (sync_pb::CommitResponse::TRANSIENT_ERROR == response) {
 417     DVLOG(1) << "Transient Error Committing: " << local_entry;
 418     LogServerError(server_entry);
 419     return sync_pb::CommitResponse::TRANSIENT_ERROR;
 420   }
 421   if (sync_pb::CommitResponse::INVALID_MESSAGE == response) {
 422     LOG(ERROR) << "Error Commiting: " << local_entry;
 423     LogServerError(server_entry);
 424     return response;
 425   }
 426   if (sync_pb::CommitResponse::CONFLICT == response) {
 427     DVLOG(1) << "Conflict Committing: " << local_entry;
 428     return response;
 429   }
 430   if (sync_pb::CommitResponse::RETRY == response) {
 431     DVLOG(1) << "Retry Committing: " << local_entry;
 432     return response;
 433   }
 434   if (sync_pb::CommitResponse::OVER_QUOTA == response) {
 435     LOG(WARNING) << "Hit deprecated OVER_QUOTA Committing: " << local_entry;
 436     return response;
 437   }
 438   if (!server_entry.has_id_string()) {
 439     LOG(ERROR) << "Commit response has no id";
 440     return sync_pb::CommitResponse::INVALID_MESSAGE;
 441   }
 442
 443   // Implied by the IsValid call above, but here for clarity.
 444   DCHECK_EQ(sync_pb::CommitResponse::SUCCESS, response) << response;
 445   // Check to see if we've been given the ID of an existing entry. If so treat
 446   // it as an error response and retry later.
 447   const syncable::Id& server_entry_id =
 448       SyncableIdFromProto(server_entry.id_string());
 449   if (local_entry.GetId() != server_entry_id) {
 450     Entry e(trans, syncable::GET_BY_ID, server_entry_id);
 451     if (e.good()) {
 452       LOG(ERROR)
 453           << "Got duplicate id when commiting id: "
 454           << local_entry.GetId()
 455           << ". Treating as an error return";
 456       return sync_pb::CommitResponse::INVALID_MESSAGE;
 457     }
 458   }
 459
 460   if (server_entry.version() == 0) {
 461     LOG(WARNING) << "Server returned a zero version on a commit response.";
 462   }
 463
 464   ProcessSuccessfulCommitResponse(commit_request_entry, server_entry,
 465       local_entry.GetId(), &local_entry, syncing_was_set, deleted_folders);
 466   return response;
 467 }
 468
 469 }  // namespace commit_util
 470
 471 }  // namespace syncer