sync: Implement per-type commit interface

sync/engine/sync_directory_commit_contribution.cc

Index: sync/engine/sync_directory_commit_contribution.cc
diff --git a/sync/engine/sync_directory_commit_contribution.cc b/sync/engine/sync_directory_commit_contribution.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f43131e300f290564db7c942d1733788df8a5857
--- /dev/null
+++ b/sync/engine/sync_directory_commit_contribution.cc
@@ -0,0 +1,164 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "sync/engine/sync_directory_commit_contribution.h"
+
+#include "sync/engine/commit_util.h"
+#include "sync/engine/get_commit_ids.h"
+#include "sync/engine/syncer_util.h"
+#include "sync/syncable/model_neutral_mutable_entry.h"
+#include "sync/syncable/syncable_model_neutral_write_transaction.h"
+
+namespace syncer {
+
+using syncable::GET_BY_HANDLE;
+using syncable::SYNCER;
+
+SyncDirectoryCommitContribution::~SyncDirectoryCommitContribution() {
+  DCHECK(!syncing_bits_set_);
+}
+
+// static.
+SyncDirectoryCommitContribution* SyncDirectoryCommitContribution::Build(
+    syncable::Directory* dir,
+    ModelType type,
+    size_t max_entries) {
+  std::vector<int64> metahandles;
+
+  syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir);
+  GetCommitIdsForType(&trans, type, max_entries, &metahandles);
+
+  if (metahandles.empty())
+    return NULL;
+
+  google::protobuf::RepeatedPtrField<sync_pb::SyncEntity> entities;
+  for (std::vector<int64>::iterator it = metahandles.begin();
+       it != metahandles.end(); ++it) {
+    sync_pb::SyncEntity* entity = entities.Add();
+    syncable::ModelNeutralMutableEntry entry(&trans, GET_BY_HANDLE, *it);
+    commit_util::BuildCommitItem(entry, entity);
+    entry.PutSyncing(true);
+  }
+
+  return new SyncDirectoryCommitContribution(metahandles, entities, dir);
+}
+
+void SyncDirectoryCommitContribution::AddToCommitMessage(
+    sync_pb::ClientToServerMessage* msg) {
+  DCHECK(syncing_bits_set_);
+  sync_pb::CommitMessage* commit_message = msg->mutable_commit();
+  entries_start_index_ = commit_message->entries_size();
+  std::copy(entities_.begin(),
+            entities_.end(),
+            RepeatedPtrFieldBackInserter(commit_message->mutable_entries()));
+}
+
+SyncerError SyncDirectoryCommitContribution::ProcessCommitResponse(
+    const sync_pb::ClientToServerResponse& response,
+    sessions::StatusController* status) {
+  DCHECK(syncing_bits_set_);
+  const sync_pb::CommitResponse& commit_response = response.commit();
+
+  int transient_error_commits = 0;
+  int conflicting_commits = 0;
+  int error_commits = 0;
+  int successes = 0;
+
+  std::set<syncable::Id> deleted_folders;
+  {
+    syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir_);
+    for (size_t i = 0; i < metahandles_.size(); ++i) {
+      sync_pb::CommitResponse::ResponseType response_type =
+          commit_util::ProcessSingleCommitResponse(
+              &trans,
+              commit_response.entryresponse(entries_start_index_ + i),
+              entities_.Get(i),
+              metahandles_[i],
+              &deleted_folders);
+      switch (response_type) {
+        case sync_pb::CommitResponse::INVALID_MESSAGE:
+          ++error_commits;
+          break;
+        case sync_pb::CommitResponse::CONFLICT:
+          ++conflicting_commits;
+          status->increment_num_server_conflicts();
+          break;
+        case sync_pb::CommitResponse::SUCCESS:
+          ++successes;
+          {
+            syncable::Entry e(&trans, GET_BY_HANDLE, metahandles_[i]);
+            if (e.GetModelType() == BOOKMARKS)
+              status->increment_num_successful_bookmark_commits();
+          }
+          status->increment_num_successful_commits();
+          break;
+        case sync_pb::CommitResponse::OVER_QUOTA:
+          // We handle over quota like a retry, which is same as transient.
+        case sync_pb::CommitResponse::RETRY:
+        case sync_pb::CommitResponse::TRANSIENT_ERROR:
+          ++transient_error_commits;
+          break;
+        default:
+          LOG(FATAL) << "Bad return from ProcessSingleCommitResponse";
+      }
+    }
+    MarkDeletedChildrenSynced(dir_, &trans, &deleted_folders);
+  }
+
+  int commit_count = static_cast<int>(metahandles_.size());
+  if (commit_count == successes) {
+    return SYNCER_OK;
+  } else if (error_commits > 0) {
+    return SERVER_RETURN_UNKNOWN_ERROR;
+  } else if (transient_error_commits > 0) {
+    return SERVER_RETURN_TRANSIENT_ERROR;
+  } else if (conflicting_commits > 0) {
+    // This means that the server already has an item with this version, but
+    // we haven't seen that update yet.
+    //
+    // A well-behaved client should respond to this by proceeding to the
+    // download updates phase, fetching the conflicting items, then attempting
+    // to resolve the conflict.  That's not what this client does.
+    //
+    // We don't currently have any code to support that exceptional control
+    // flow.  Instead, we abort the current sync cycle and start a new one.  The
+    // end result is the same.
+    return SERVER_RETURN_CONFLICT;
+  } else {
+    LOG(FATAL) << "Inconsistent counts when processing commit response";
+    return SYNCER_OK;
+  }
+}
+
+void SyncDirectoryCommitContribution::CleanUp() {
+  DCHECK(syncing_bits_set_);
+  UnsetSyncingBits();
+}
+
+size_t SyncDirectoryCommitContribution::GetNumEntries() const {
+  return metahandles_.size();
+}
+
+SyncDirectoryCommitContribution::SyncDirectoryCommitContribution(
+    const std::vector<int64>& metahandles,
+    const google::protobuf::RepeatedPtrField<sync_pb::SyncEntity>& entities,
+    syncable::Directory* dir)
+  : dir_(dir),
+    metahandles_(metahandles),
+    entities_(entities),
+    entries_start_index_(0xDEADBEEF),
+    syncing_bits_set_(true) {
+}
+
+void SyncDirectoryCommitContribution::UnsetSyncingBits() {
+  syncable::ModelNeutralWriteTransaction trans(FROM_HERE, SYNCER, dir_);
+  for (std::vector<int64>::const_iterator it = metahandles_.begin();
+       it != metahandles_.end(); ++it) {
+    syncable::ModelNeutralMutableEntry entry(&trans, GET_BY_HANDLE, *it);
+    entry.PutSyncing(false);
+  }
+  syncing_bits_set_ = false;
+}
+
+}  // namespace syncer