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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/debug/trace_event.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/message_loop/message_loop.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "sync/engine/apply_control_data_updates.h"
#include "sync/engine/commit.h"
#include "sync/engine/conflict_resolver.h"
#include "sync/engine/download.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) {
}
Syncer::~Syncer() {}
bool Syncer::ExitRequested() {
return cancelation_signal_->IsSignalled();
}
bool Syncer::NormalSyncShare(ModelTypeSet request_types,
const NudgeTracker& nudge_tracker,
SyncSession* session) {
HandleCycleBegin(session);
VLOG(1) << "Downloading types " << ModelTypeSetToString(request_types);
if (nudge_tracker.IsGetUpdatesRequired() ||
session->context()->ShouldFetchUpdatesBeforeCommit()) {
if (!DownloadAndApplyUpdates(
request_types,
session,
base::Bind(&download::BuildNormalDownloadUpdates,
session,
kCreateMobileBookmarksFolder,
request_types,
base::ConstRef(nudge_tracker)))) {
return HandleCycleEnd(session, nudge_tracker.updates_source());
}
}
VLOG(1) << "Committing from types " << ModelTypeSetToString(request_types);
SyncerError commit_result = BuildAndPostCommits(request_types, session);
session->mutable_status_controller()->set_commit_result(commit_result);
return HandleCycleEnd(session, nudge_tracker.updates_source());
}
bool Syncer::ConfigureSyncShare(
ModelTypeSet request_types,
sync_pb::GetUpdatesCallerInfo::GetUpdatesSource source,
SyncSession* session) {
HandleCycleBegin(session);
VLOG(1) << "Configuring types " << ModelTypeSetToString(request_types);
DownloadAndApplyUpdates(
request_types,
session,
base::Bind(&download::BuildDownloadUpdatesForConfigure,
session,
kCreateMobileBookmarksFolder,
source,
request_types));
return HandleCycleEnd(session, source);
}
bool Syncer::PollSyncShare(ModelTypeSet request_types,
SyncSession* session) {
HandleCycleBegin(session);
VLOG(1) << "Polling types " << ModelTypeSetToString(request_types);
DownloadAndApplyUpdates(
request_types,
session,
base::Bind(&download::BuildDownloadUpdatesForPoll,
session,
kCreateMobileBookmarksFolder,
request_types));
return HandleCycleEnd(session, sync_pb::GetUpdatesCallerInfo::PERIODIC);
}
void Syncer::ApplyUpdates(SyncSession* session) {
TRACE_EVENT0("sync", "ApplyUpdates");
ApplyControlDataUpdates(session->context()->directory());
UpdateHandlerMap* handler_map = session->context()->update_handler_map();
for (UpdateHandlerMap::iterator it = handler_map->begin();
it != handler_map->end(); ++it) {
it->second->ApplyUpdates(session->mutable_status_controller());
}
session->context()->set_hierarchy_conflict_detected(
session->status_controller().num_hierarchy_conflicts() > 0);
session->SendEventNotification(SyncEngineEvent::STATUS_CHANGED);
}
bool Syncer::DownloadAndApplyUpdates(
ModelTypeSet request_types,
SyncSession* session,
base::Callback<void(sync_pb::ClientToServerMessage*)> build_fn) {
SyncerError download_result = UNSET;
do {
TRACE_EVENT0("sync", "DownloadUpdates");
sync_pb::ClientToServerMessage msg;
build_fn.Run(&msg);
download_result =
download::ExecuteDownloadUpdates(request_types, session, &msg);
session->mutable_status_controller()->set_last_download_updates_result(
download_result);
} 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;
ApplyUpdates(session);
if (ExitRequested())
return false;
return true;
}
SyncerError Syncer::BuildAndPostCommits(ModelTypeSet requested_types,
sessions::SyncSession* session) {
// 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()->max_commit_batch_size(),
session->context()->account_name(),
session->context()->directory()->cache_guid(),
session->context()->commit_contributor_map(),
session->context()->extensions_activity()));
if (!commit) {
break;
}
SyncerError error = commit->PostAndProcessResponse(
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(SyncEngineEvent::SYNC_CYCLE_BEGIN);
}
bool Syncer::HandleCycleEnd(
SyncSession* session,
sync_pb::GetUpdatesCallerInfo::GetUpdatesSource source) {
if (!ExitRequested()) {
session->SendSyncCycleEndEventNotification(source);
return true;
} else {
return false;
}
}
} // namespace syncer
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