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// Copyright (c) 2012 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/syncer.h"
#include "base/auto_reset.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/time/time.h"
#include "base/trace_event/trace_event.h"
#include "build/build_config.h"
#include "sync/engine/apply_control_data_updates.h"
#include "sync/engine/clear_server_data.h"
#include "sync/engine/commit.h"
#include "sync/engine/commit_processor.h"
#include "sync/engine/conflict_resolver.h"
#include "sync/engine/get_updates_delegate.h"
#include "sync/engine/get_updates_processor.h"
#include "sync/engine/net/server_connection_manager.h"
#include "sync/engine/syncer_types.h"
#include "sync/internal_api/public/base/cancelation_signal.h"
#include "sync/internal_api/public/base/unique_position.h"
#include "sync/internal_api/public/util/syncer_error.h"
#include "sync/sessions/nudge_tracker.h"
#include "sync/syncable/directory.h"
#include "sync/syncable/mutable_entry.h"
#include "sync/syncable/syncable-inl.h"
using base::Time;
using base::TimeDelta;
using sync_pb::ClientCommand;
namespace syncer {
// TODO(akalin): We may want to propagate this switch up
// eventually.
#if defined(OS_ANDROID) || defined(OS_IOS)
static const bool kCreateMobileBookmarksFolder = true;
#else
static const bool kCreateMobileBookmarksFolder = false;
#endif
using sessions::StatusController;
using sessions::SyncSession;
using sessions::NudgeTracker;
Syncer::Syncer(syncer::CancelationSignal* cancelation_signal)
: cancelation_signal_(cancelation_signal),
is_syncing_(false) {
}
Syncer::~Syncer() {}
bool Syncer::ExitRequested() {
return cancelation_signal_->IsSignalled();
}
bool Syncer::IsSyncing() const {
return is_syncing_;
}
bool Syncer::NormalSyncShare(ModelTypeSet request_types,
NudgeTracker* nudge_tracker,
SyncSession* session) {
base::AutoReset<bool> is_syncing(&is_syncing_, true);
HandleCycleBegin(session);
if (nudge_tracker->IsGetUpdatesRequired() ||
session->context()->ShouldFetchUpdatesBeforeCommit()) {
VLOG(1) << "Downloading types " << ModelTypeSetToString(request_types);
NormalGetUpdatesDelegate normal_delegate(*nudge_tracker);
GetUpdatesProcessor get_updates_processor(
session->context()->model_type_registry()->update_handler_map(),
normal_delegate);
if (!DownloadAndApplyUpdates(
&request_types,
session,
&get_updates_processor,
kCreateMobileBookmarksFolder)) {
return HandleCycleEnd(session, nudge_tracker->GetLegacySource());
}
}
VLOG(1) << "Committing from types " << ModelTypeSetToString(request_types);
CommitProcessor commit_processor(
session->context()->model_type_registry()->commit_contributor_map());
SyncerError commit_result = BuildAndPostCommits(request_types, nudge_tracker,
session, &commit_processor);
session->mutable_status_controller()->set_commit_result(commit_result);
return HandleCycleEnd(session, nudge_tracker->GetLegacySource());
}
bool Syncer::ConfigureSyncShare(
ModelTypeSet request_types,
sync_pb::GetUpdatesCallerInfo::GetUpdatesSource source,
SyncSession* session) {
base::AutoReset<bool> is_syncing(&is_syncing_, true);
VLOG(1) << "Configuring types " << ModelTypeSetToString(request_types);
HandleCycleBegin(session);
ConfigureGetUpdatesDelegate configure_delegate(source);
GetUpdatesProcessor get_updates_processor(
session->context()->model_type_registry()->update_handler_map(),
configure_delegate);
DownloadAndApplyUpdates(
&request_types,
session,
&get_updates_processor,
kCreateMobileBookmarksFolder);
return HandleCycleEnd(session, source);
}
bool Syncer::PollSyncShare(ModelTypeSet request_types,
SyncSession* session) {
base::AutoReset<bool> is_syncing(&is_syncing_, true);
VLOG(1) << "Polling types " << ModelTypeSetToString(request_types);
HandleCycleBegin(session);
PollGetUpdatesDelegate poll_delegate;
GetUpdatesProcessor get_updates_processor(
session->context()->model_type_registry()->update_handler_map(),
poll_delegate);
DownloadAndApplyUpdates(
&request_types,
session,
&get_updates_processor,
kCreateMobileBookmarksFolder);
return HandleCycleEnd(session, sync_pb::GetUpdatesCallerInfo::PERIODIC);
}
bool Syncer::DownloadAndApplyUpdates(
ModelTypeSet* request_types,
SyncSession* session,
GetUpdatesProcessor* get_updates_processor,
bool create_mobile_bookmarks_folder) {
SyncerError download_result = UNSET;
do {
download_result = get_updates_processor->DownloadUpdates(
request_types,
session,
create_mobile_bookmarks_folder);
} while (download_result == SERVER_MORE_TO_DOWNLOAD);
// Exit without applying if we're shutting down or an error was detected.
if (download_result != SYNCER_OK)
return false;
if (ExitRequested())
return false;
{
TRACE_EVENT0("sync", "ApplyUpdates");
// Control type updates always get applied first.
ApplyControlDataUpdates(session->context()->directory());
// Apply upates to the other types. May or may not involve cross-thread
// traffic, depending on the underlying update handlers and the GU type's
// delegate.
get_updates_processor->ApplyUpdates(*request_types,
session->mutable_status_controller());
session->context()->set_hierarchy_conflict_detected(
session->status_controller().num_hierarchy_conflicts() > 0);
session->SendEventNotification(SyncCycleEvent::STATUS_CHANGED);
}
if (ExitRequested())
return false;
return true;
}
SyncerError Syncer::BuildAndPostCommits(ModelTypeSet requested_types,
sessions::NudgeTracker* nudge_tracker,
sessions::SyncSession* session,
CommitProcessor* commit_processor) {
// The ExitRequested() check is unnecessary, since we should start getting
// errors from the ServerConnectionManager if an exist has been requested.
// However, it doesn't hurt to check it anyway.
while (!ExitRequested()) {
scoped_ptr<Commit> commit(
Commit::Init(
requested_types,
session->context()->GetEnabledTypes(),
session->context()->max_commit_batch_size(),
session->context()->account_name(),
session->context()->directory()->cache_guid(),
commit_processor,
session->context()->extensions_activity()));
if (!commit) {
break;
}
SyncerError error = commit->PostAndProcessResponse(
nudge_tracker, session, session->mutable_status_controller(),
session->context()->extensions_activity());
commit->CleanUp();
if (error != SYNCER_OK) {
return error;
}
}
return SYNCER_OK;
}
void Syncer::HandleCycleBegin(SyncSession* session) {
session->mutable_status_controller()->UpdateStartTime();
session->SendEventNotification(SyncCycleEvent::SYNC_CYCLE_BEGIN);
}
bool Syncer::HandleCycleEnd(
SyncSession* session,
sync_pb::GetUpdatesCallerInfo::GetUpdatesSource source) {
if (!ExitRequested()) {
session->SendSyncCycleEndEventNotification(source);
bool success = !sessions::HasSyncerError(
session->status_controller().model_neutral_state());
if (success && source == sync_pb::GetUpdatesCallerInfo::PERIODIC)
session->mutable_status_controller()->UpdatePollTime();
return success;
} else {
return false;
}
}
bool Syncer::PostClearServerData(SyncSession* session) {
DCHECK(session);
ClearServerData clear_server_data(session->context()->account_name());
const SyncerError post_result = clear_server_data.SendRequest(session);
return post_result == SYNCER_OK;
}
} // namespace syncer
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