OpenHarmony-v4.0.1-Release/s

/*
 * Copyright (c) 2023 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#include "cloud_syncer.h"

#include <cstdint>
#include <utility>
#include <unordered_map>

#include "cloud/cloud_db_constant.h"
#include "cloud/cloud_storage_utils.h"
#include "cloud_sync_tag_assets.h"
#include "cloud_sync_utils.h"
#include "db_errno.h"
#include "cloud/icloud_db.h"
#include "kv_store_errno.h"
#include "log_print.h"
#include "platform_specific.h"
#include "runtime_context.h"
#include "strategy_factory.h"
#include "storage_proxy.h"
#include "store_types.h"

namespace DistributedDB {
namespace {
    const TaskId INVALID_TASK_ID = 0u;
    const int MAX_HEARTBEAT_FAILED_LIMIT = 2;
    const int HEARTBEAT_PERIOD = 3;
    const int MAX_DOWNLOAD_COMMIT_LIMIT = 5;
}

CloudSyncer::CloudSyncer(std::shared_ptr<StorageProxy> storageProxy)
    : currentTaskId_(INVALID_TASK_ID),
      storageProxy_(std::move(storageProxy)),
      queuedManualSyncLimit_(DBConstant::QUEUED_SYNC_LIMIT_DEFAULT),
      closed_(false),
      timerId_(0u),
      heartBeatCount_(0),
      failedHeartBeatCount_(0),
      syncCallbackCount_(0)
{
    if (storageProxy_ != nullptr) {
        id_ = storageProxy_->GetIdentify();
    }
}

int CloudSyncer::Sync(const std::vector<DeviceID> &devices, SyncMode mode,
    const std::vector<std::string> &tables, const SyncProcessCallback &callback, int64_t waitTime)
{
    int errCode = CheckParamValid(devices, mode);
    if (errCode != E_OK) {
        return errCode;
    }
    if (cloudDB_.IsNotExistCloudDB()) {
        return -E_CLOUD_ERROR;
    }
    if (closed_) {
        return -E_DB_CLOSED;
    }
    CloudTaskInfo taskInfo;
    taskInfo.mode = mode;
    taskInfo.table = tables;
    taskInfo.callback = callback;
    taskInfo.timeout = waitTime;
    taskInfo.devices = devices;
    errCode = TryToAddSyncTask(std::move(taskInfo));
    if (errCode != E_OK) {
        return errCode;
    }
    return TriggerSync();
}

void CloudSyncer::SetCloudDB(const std::shared_ptr<ICloudDb> &cloudDB)
{
    cloudDB_.SetCloudDB(cloudDB);
    LOGI("[CloudSyncer] SetCloudDB finish");
}

void CloudSyncer::SetIAssetLoader(const std::shared_ptr<IAssetLoader> &loader)
{
    cloudDB_.SetIAssetLoader(loader);
    LOGI("[CloudSyncer] SetIAssetLoader finish");
}

void CloudSyncer::Close()
{
    closed_ = true;
    CloudSyncer::TaskId currentTask;
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        currentTask = currentContext_.currentTaskId;
    }
    // mark current task db_closed
    SetTaskFailed(currentTask, -E_DB_CLOSED);
    cloudDB_.Close();
    {
        LOGD("[CloudSyncer] begin wait current task finished");
        std::unique_lock<std::mutex> uniqueLock(contextLock_);
        contextCv_.wait(uniqueLock, [this]() {
            return currentContext_.currentTaskId == INVALID_TASK_ID;
        });
        LOGD("[CloudSyncer] current task has been finished");
    }

    // copy all task from queue
    std::vector<CloudTaskInfo> infoList;
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        for (const auto &item: cloudTaskInfos_) {
            infoList.push_back(item.second);
        }
        taskQueue_.clear();
        cloudTaskInfos_.clear();
    }
    // notify all DB_CLOSED
    for (auto &info: infoList) {
        info.status = ProcessStatus::FINISHED;
        info.errCode = -E_DB_CLOSED;
        ProcessNotifier notifier(this);
        notifier.Init(info.table, info.devices);
        notifier.NotifyProcess(info, {}, true);
        LOGI("[CloudSyncer] finished taskId %" PRIu64 " errCode %d", info.taskId, info.errCode);
    }
    storageProxy_->Close();
    WaitAllSyncCallbackTaskFinish();
}

int CloudSyncer::TriggerSync()
{
    if (closed_) {
        return -E_DB_CLOSED;
    }
    RefObject::IncObjRef(this);
    int errCode = RuntimeContext::GetInstance()->ScheduleTask([this]() {
        DoSyncIfNeed();
        RefObject::DecObjRef(this);
    });
    if (errCode != E_OK) {
        LOGW("[CloudSyncer] schedule sync task failed %d", errCode);
        RefObject::DecObjRef(this);
    }
    return errCode;
}

void CloudSyncer::DoSyncIfNeed()
{
    if (closed_) {
        return;
    }
    // get taskId from queue
    TaskId triggerTaskId;
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        if (taskQueue_.empty()) {
            return;
        }
        triggerTaskId = taskQueue_.front();
    }
    // pop taskId in queue
    if (PrepareSync(triggerTaskId) != E_OK) {
        return;
    }
    // do sync logic
    int errCode = DoSync(triggerTaskId);
    // finished after sync
    DoFinished(triggerTaskId, errCode, {});
    // do next task async
    (void)TriggerSync();
}

int CloudSyncer::DoSync(TaskId taskId)
{
    std::lock_guard<std::mutex> lock(syncMutex_);
    CloudTaskInfo taskInfo;
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        taskInfo = cloudTaskInfos_[taskId];
    }
    int errCode = LockCloud(taskId);
    if (errCode != E_OK) {
        return errCode;
    }
    bool needUpload = true;
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        needUpload = currentContext_.strategy->JudgeUpload();
    }
    errCode = DoSyncInner(taskInfo, needUpload);
    int unlockCode = UnlockCloud();
    if (errCode == E_OK) {
        errCode = unlockCode;
    }
    return errCode;
}

int CloudSyncer::DoUploadInNeed(const CloudTaskInfo &taskInfo, const bool needUpload)
{
    if (!needUpload) {
        return E_OK;
    }
    int errCode = storageProxy_->StartTransaction();
    if (errCode != E_OK) {
        LOGE("[CloudSyncer] start transaction Failed before doing upload.");
        return errCode;
    }
    for (size_t i = 0; i < taskInfo.table.size(); ++i) {
        LOGD("[CloudSyncer] try upload table, index: %zu", i);
        errCode = CheckTaskIdValid(taskInfo.taskId);
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] task is invalid, abort sync");
            break;
        }
        {
            std::lock_guard<std::mutex> autoLock(contextLock_);
            currentContext_.tableName = taskInfo.table[i];
        }
        errCode = DoUpload(taskInfo.taskId, i == (taskInfo.table.size() - 1u));
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] upload failed %d", errCode);
            break;
        }
        errCode = SaveCloudWaterMark(taskInfo.table[i]);
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] Can not save cloud water mark after uploading %d", errCode);
            break;
        }
    }
    if (errCode == E_OK) {
        int commitErrorCode = storageProxy_->Commit();
        if (commitErrorCode != E_OK) {
            LOGE("[CloudSyncer] cannot commit transaction: %d.", commitErrorCode);
        }
    } else {
        int rollBackErrorCode = storageProxy_->Rollback();
        if (rollBackErrorCode != E_OK) {
            LOGE("[CloudSyncer] cannot roll back transaction: %d.", rollBackErrorCode);
        }
    }
    return errCode;
}

int CloudSyncer::DoSyncInner(const CloudTaskInfo &taskInfo, const bool needUpload)
{
    int errCode = E_OK;
    for (size_t i = 0; i < taskInfo.table.size(); ++i) {
        LOGD("[CloudSyncer] try download table, index: %zu", i);
        errCode = CheckTaskIdValid(taskInfo.taskId);
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] task is invalid, abort sync");
            return errCode;
        }
        {
            std::lock_guard<std::mutex> autoLock(contextLock_);
            currentContext_.tableName = taskInfo.table[i];
        }
        errCode = DoDownload(taskInfo.taskId);
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] download failed %d", errCode);
            return errCode;
        }
        if (needUpload) {
            continue;
        }
        errCode = SaveCloudWaterMark(taskInfo.table[i]);
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] Can not save cloud water mark after downloading %d", errCode);
            return errCode;
        }
    }

    return DoUploadInNeed(taskInfo, needUpload);
}

void CloudSyncer::DoFinished(TaskId taskId, int errCode, const InnerProcessInfo &processInfo)
{
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        taskQueue_.remove(taskId);
    }
    std::shared_ptr<ProcessNotifier> notifier = nullptr;
    {
        // check current task is running or not
        std::lock_guard<std::mutex> autoLock(contextLock_);
        if (currentContext_.currentTaskId != taskId) { // should not happen
            LOGW("[CloudSyncer] taskId %" PRIu64 " not exist in context!", taskId);
            return;
        }
        currentContext_.currentTaskId = INVALID_TASK_ID;
        notifier = currentContext_.notifier;
        currentContext_.notifier = nullptr;
        currentContext_.strategy = nullptr;
        currentContext_.tableName.clear();
        currentContext_.assetDownloadList.completeDownloadList.clear();
        currentContext_.assetDownloadList.downloadList.clear();
        currentContext_.assetFields.clear();
        currentContext_.assetsInfo.clear();
        currentContext_.cloudWaterMarks.clear();
    }
    CloudTaskInfo info;
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        if (cloudTaskInfos_.find(taskId) == cloudTaskInfos_.end()) { // should not happen
            LOGW("[CloudSyncer] taskId %" PRIu64 " has been finished!", taskId);
            contextCv_.notify_one();
            return;
        }
        info = std::move(cloudTaskInfos_[taskId]);
        cloudTaskInfos_.erase(taskId);
    }
    contextCv_.notify_one();
    if (info.errCode == E_OK) {
        info.errCode = errCode;
    }
    LOGI("[CloudSyncer] finished taskId %" PRIu64 " errCode %d", taskId, info.errCode);
    info.status = ProcessStatus::FINISHED;
    if (notifier != nullptr) {
        notifier->NotifyProcess(info, processInfo, true);
    }
}

static int SaveChangedDataByType(const VBucket &datum, ChangedData &changedData, const DataInfoWithLog &localInfo,
    ChangeType type)
{
    int ret = E_OK;
    std::vector<Type> cloudPkVals;
    if (type == ChangeType::OP_DELETE) {
        ret = GetCloudPkVals(localInfo.primaryKeys, changedData.field, localInfo.logInfo.dataKey, cloudPkVals);
    } else {
        ret = GetCloudPkVals(datum, changedData.field, localInfo.logInfo.dataKey, cloudPkVals);
    }
    if (ret != E_OK) {
        return ret;
    }
    changedData.primaryData[type].emplace_back(std::move(cloudPkVals));
    return E_OK;
}

int CloudSyncer::FindDeletedListIndex(const std::vector<std::pair<Key, size_t>> &deletedList, const Key &hashKey,
    size_t &delIdx)
{
    for (std::pair<Key, size_t> pair : deletedList) {
        if (pair.first == hashKey) {
            delIdx = pair.second;
            return E_OK;
        }
    }
    return -E_INTERNAL_ERROR;
}

int CloudSyncer::SaveChangedData(SyncParam &param, int downIndex, const DataInfo &dataInfo,
    std::vector<std::pair<Key, size_t>> &deletedList)
{
    OpType opType = param.downloadData.opType[downIndex];
    Key hashKey = dataInfo.localInfo.logInfo.hashKey;
    if (param.deletePrimaryKeySet.find(hashKey) != param.deletePrimaryKeySet.end()) {
        if (opType == OpType::INSERT) {
            size_t delIdx;
            int errCode = FindDeletedListIndex(deletedList, hashKey, delIdx);
            if (errCode != E_OK) {
                LOGE("[CloudSyncer] FindDeletedListIndex could not find delete item.");
                return errCode;
            }
            param.changedData.primaryData[ChangeType::OP_DELETE].erase(
                param.changedData.primaryData[ChangeType::OP_DELETE].begin() + delIdx);
            (void)param.dupHashKeySet.insert(hashKey);
            opType = OpType::UPDATE;
            // only composite primary key needs to be processed.
            if (!param.isSinglePrimaryKey) {
                param.withoutRowIdData.updateData.push_back(std::make_tuple(downIndex,
                    param.changedData.primaryData[ChangeType::OP_UPDATE].size()));
            }
        } else if (opType == OpType::DELETE) {
            std::pair<Key, size_t> pair{hashKey, static_cast<size_t>(
                param.changedData.primaryData[ChangeType::OP_DELETE].size())};
            deletedList.emplace_back(pair);
        } else {
            LOGW("[CloudSyncer] deletePrimaryKeySet ignore opType %d.", opType);
        }
    }
    // INSERT: for no primary key or composite primary key situation
    if (!param.isSinglePrimaryKey && opType == OpType::INSERT) {
        param.withoutRowIdData.insertData.push_back(downIndex);
        return E_OK;
    }
    switch (opType) {
        // INSERT: only for single primary key situation
        case OpType::INSERT:
            return SaveChangedDataByType(
                param.downloadData.data[downIndex], param.changedData, dataInfo.localInfo, ChangeType::OP_INSERT);
        case OpType::UPDATE:
            if (NeedSaveData(dataInfo.localInfo.logInfo, dataInfo.cloudLogInfo)) {
                return SaveChangedDataByType(param.downloadData.data[downIndex], param.changedData,
                    dataInfo.localInfo, ChangeType::OP_UPDATE);
            }
            break;
        case OpType::DELETE:
            return SaveChangedDataByType(param.downloadData.data[downIndex], param.changedData,
                dataInfo.localInfo, ChangeType::OP_DELETE);
        default:
            break;
    }
    return E_OK;
}

static LogInfo GetCloudLogInfo(VBucket &datum)
{
    LogInfo cloudLogInfo = { 0 };
    cloudLogInfo.timestamp = (Timestamp)std::get<int64_t>(datum[CloudDbConstant::MODIFY_FIELD]);
    cloudLogInfo.wTimestamp = (Timestamp)std::get<int64_t>(datum[CloudDbConstant::CREATE_FIELD]);
    cloudLogInfo.flag = (std::get<bool>(datum[CloudDbConstant::DELETE_FIELD])) ? 1u : 0u;
    cloudLogInfo.cloudGid = std::get<std::string>(datum[CloudDbConstant::GID_FIELD]);
    return cloudLogInfo;
}

/**
 * UpdateChangedData will be used for Insert case, which we can only get rowid after we saved data in db.
*/
int CloudSyncer::UpdateChangedData(SyncParam &param, AssetDownloadList &assetsDownloadList)
{
    if (param.withoutRowIdData.insertData.empty() && param.withoutRowIdData.updateData.empty()) {
        return E_OK;
    }
    int ret = E_OK;
    for (size_t j : param.withoutRowIdData.insertData) {
        VBucket &datum = param.downloadData.data[j];
        std::vector<Type> primaryValues;
        ret = GetCloudPkVals(datum, param.changedData.field,
            std::get<int64_t>(datum[CloudDbConstant::ROW_ID_FIELD_NAME]), primaryValues);
        if (ret != E_OK) {
            LOGE("[CloudSyncer] updateChangedData cannot get primaryValues");
            return ret;
        }
        param.changedData.primaryData[ChangeType::OP_INSERT].push_back(primaryValues);
    }
    for (const auto &tuple : param.withoutRowIdData.assetInsertData) {
        size_t downloadIndex = std::get<0>(tuple);
        VBucket &datum = param.downloadData.data[downloadIndex];
        size_t insertIdx = std::get<1>(tuple);
        std::vector<Type> &pkVal = std::get<5>(assetsDownloadList.downloadList[insertIdx]); // 5 means primary key list
        pkVal[0] = datum[CloudDbConstant::ROW_ID_FIELD_NAME];
    }
    for (const auto &tuple : param.withoutRowIdData.updateData) {
        size_t downloadIndex = std::get<0>(tuple);
        size_t updateIndex = std::get<1>(tuple);
        VBucket &datum = param.downloadData.data[downloadIndex];
        size_t size = param.changedData.primaryData[ChangeType::OP_UPDATE].size();
        if (updateIndex >= size) {
            LOGE("[CloudSyncer] updateIndex is invalid. index=%zu, size=%zu", updateIndex, size);
            return -E_INTERNAL_ERROR;
        }
        if (param.changedData.primaryData[ChangeType::OP_UPDATE][updateIndex].empty()) {
            LOGE("[CloudSyncer] primary key value list should not be empty.");
            return -E_INTERNAL_ERROR;
        }
        // no primary key or composite primary key, the first element is rowid
        param.changedData.primaryData[ChangeType::OP_UPDATE][updateIndex][0] =
            datum[CloudDbConstant::ROW_ID_FIELD_NAME];
    }
    return ret;
}

bool CloudSyncer::IsDataContainDuplicateAsset(const std::vector<Field> &assetFields, VBucket &data)
{
    for (const auto &assetField : assetFields) {
        if (assetField.type == TYPE_INDEX<Assets> && data[assetField.colName].index() == TYPE_INDEX<Assets>) {
            if (CloudStorageUtils::IsAssetsContainDuplicateAsset(std::get<Assets>(data[assetField.colName]))) {
                return true;
            }
        }
    }
    return false;
}

bool CloudSyncer::IsDataContainAssets()
{
    std::lock_guard<std::mutex> autoLock(contextLock_);
    bool hasTable = (currentContext_.assetFields.find(currentContext_.tableName) != currentContext_.assetFields.end());
    if (!hasTable) {
        LOGW("[CloudSyncer] failed to get assetFields, because tableName doesn't exit in currentContext, %d.",
            -E_INTERNAL_ERROR);
            return false;
    }
    if (hasTable && currentContext_.assetFields[currentContext_.tableName].empty()) {
        LOGI("[CloudSyncer] Current table do not contain assets, thereby we needn't download assets");
        return false;
    }
    return true;
}

void CloudSyncer::IncSyncCallbackTaskCount()
{
    std::lock_guard<std::mutex> autoLock(syncCallbackMutex_);
    syncCallbackCount_++;
}

void CloudSyncer::DecSyncCallbackTaskCount()
{
    {
        std::lock_guard<std::mutex> autoLock(syncCallbackMutex_);
        syncCallbackCount_--;
    }
    syncCallbackCv_.notify_all();
}

void CloudSyncer::WaitAllSyncCallbackTaskFinish()
{
    std::unique_lock<std::mutex> uniqueLock(syncCallbackMutex_);
    LOGD("[CloudSyncer] Begin wait all callback task finish");
    syncCallbackCv_.wait(uniqueLock, [this]() {
        return syncCallbackCount_ <= 0;
    });
    LOGD("[CloudSyncer] End wait all callback task finish");
}

std::map<std::string, Assets> CloudSyncer::TagAssetsInSingleRecord(VBucket &coveredData, VBucket &beCoveredData,
    bool setNormalStatus, int &errCode)
{
    // Define a map to store the result
    std::map<std::string, Assets> res = {};
    std::vector<Field> assetFields;
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        assetFields = currentContext_.assetFields[currentContext_.tableName];
    }
    // For every column contain asset or assets, assetFields are in context
    for (const Field &assetField : assetFields) {
        Assets assets = TagAssetsInSingleCol(coveredData, beCoveredData, assetField, setNormalStatus, errCode);
        if (!assets.empty()) {
            res[assetField.colName] = assets;
        }
        if (errCode != E_OK) {
            break;
        }
    }
    return res;
}

int CloudSyncer::FillCloudAssets(
    const std::string &tableName, VBucket &normalAssets, VBucket &failedAssets)
{
    int ret = E_OK;
    if (normalAssets.size() > 1) {
        ret = storageProxy_->FillCloudAssetForDownload(tableName, normalAssets, true);
        if (ret != E_OK) {
            LOGE("[CloudSyncer] Can not fill normal cloud assets for download");
            return ret;
        }
    }
    if (failedAssets.size() > 1) {
        ret = storageProxy_->FillCloudAssetForDownload(tableName, failedAssets, false);
        if (ret != E_OK) {
            LOGE("[CloudSyncer] Can not fill abnormal assets for download");
            return ret;
        }
    }
    return E_OK;
}

int CloudSyncer::HandleDownloadResult(const std::string &tableName, DownloadCommitList &commitList,
    uint32_t &successCount)
{
    successCount = 0;
    int errCode = storageProxy_->StartTransaction(TransactType::IMMEDIATE);
    if (errCode != E_OK) {
        LOGE("[CloudSyncer] start transaction Failed before handle download.");
        return errCode;
    }
    errCode = storageProxy_->SetLogTriggerStatus(false);
    if (errCode != E_OK) {
        return errCode;
    }
    for (size_t i = 0; i < commitList.size(); i++) {
        std::string gid = std::get<0>(commitList[i]); // 0 means gid is the first element in assetsInfo
        // 1 means assetsMap info [colName, assets] is the forth element in downloadList[i]
        std::map<std::string, Assets> assetsMap = std::get<1>(commitList[i]);
        bool setAllNormal = std::get<2>(commitList[i]); // 2 means whether the download return is E_OK
        VBucket normalAssets;
        VBucket failedAssets;
        normalAssets[CloudDbConstant::GID_FIELD] = gid;
        failedAssets[CloudDbConstant::GID_FIELD] = gid;
        for (auto &assetKvPair : assetsMap) {
            Assets &assets = assetKvPair.second;
            if (setAllNormal) {
                normalAssets[assetKvPair.first] = std::move(assets);
            } else {
                failedAssets[assetKvPair.first] = std::move(assets);
            }
        }
        errCode = FillCloudAssets(tableName, normalAssets, failedAssets);
        if (errCode != E_OK) {
            break;
        }
        successCount++;
    }
    errCode = storageProxy_->SetLogTriggerStatus(true);
    if (errCode != E_OK) {
        LOGE("Set log trigger true failed when handle download.%d", errCode);
        successCount = 0;
        storageProxy_->Rollback();
        return errCode;
    }
    errCode = storageProxy_->Commit();
    if (errCode != E_OK) {
        successCount = 0;
    }
    return errCode;
}

int CloudSyncer::CloudDbDownloadAssets(InnerProcessInfo &info, DownloadList &downloadList, bool willHandleResult,
    const std::set<Key> &dupHashKeySet, ChangedData &changedAssets)
{
    int downloadStatus = E_OK;
    DownloadCommitList commitList;
    for (size_t i = 0; i < downloadList.size(); i++) {
        DownloadItem downloadItem;
        GetDownloadItem(downloadList, i, downloadItem);
        std::map<std::string, Assets> downloadAssets(downloadItem.assets);
        CloudStorageUtils::EraseNoChangeAsset(downloadAssets);
        if (downloadAssets.empty()) { // Download data (include deleting)
            continue;
        }
        int errorCode = cloudDB_.Download(info.tableName, downloadItem.gid, downloadItem.prefix, downloadAssets);
        if (errorCode == -E_NOT_SET) {
            info.downLoadInfo.failCount += (downloadList.size() - i);
            info.downLoadInfo.successCount -= (downloadList.size() - i);
            return -E_NOT_SET;
        }
        if (dupHashKeySet.find(downloadItem.hashKey) == dupHashKeySet.end()) {
            changedAssets.primaryData[OpTypeToChangeType(downloadItem.strategy)].push_back(
                downloadItem.primaryKeyValList);
        } else if (downloadItem.strategy == OpType::INSERT) {
            changedAssets.primaryData[ChangeType::OP_UPDATE].push_back(downloadItem.primaryKeyValList);
        }
        if (!willHandleResult) {
            continue;
        }
        CloudStorageUtils::MergeDownloadAsset(downloadAssets, downloadItem.assets);
        // Process result of each asset
        commitList.push_back(std::make_tuple(downloadItem.gid, std::move(downloadItem.assets), errorCode == E_OK));
        downloadStatus = downloadStatus == E_OK ? errorCode : downloadStatus;
        if ((i + 1) % MAX_DOWNLOAD_COMMIT_LIMIT == 0 || i == (commitList.size() - 1)) {
            int ret = CommitDownloadResult(info, commitList);
            if (ret != E_OK) {
                return ret;
            }
        }
    }
    if (!commitList.empty()) {
        int ret = CommitDownloadResult(info, commitList);
        if (ret != E_OK) {
            return ret;
        }
    }
    LOGD("Download status is %d", downloadStatus);
    return downloadStatus;
}

void CloudSyncer::GetDownloadItem(const DownloadList &downloadList, size_t i, DownloadItem &downloadItem)
{
    downloadItem.gid = std::get<0>(downloadList[i]); // 0 means gid is the first element in assetsInfo
    downloadItem.prefix = std::get<1>(downloadList[i]); // 1 means primaryKey is the second element in assetsInfo
    downloadItem.strategy = std::get<2>(downloadList[i]); // 2 means strategy is the third element in assetsInfo
    // 3 means assets info [colName, assets] is the forth element in downloadList[i]
    downloadItem.assets = std::get<3>(downloadList[i]);
    downloadItem.hashKey = std::get<4>(downloadList[i]); // 4 means hash key
    downloadItem.primaryKeyValList = std::get<5>(downloadList[i]); // 5 means primary key value list
}

int CloudSyncer::DownloadAssets(InnerProcessInfo &info, const std::vector<std::string> &pKColNames,
    const std::set<Key> &dupHashKeySet, ChangedData &changedAssets)
{
    if (!IsDataContainAssets()) {
        return E_OK;
    }
    // update changed data info
    if (!IsChngDataEmpty(changedAssets)) {
        // changedData.primaryData should have no member inside
        return -E_INVALID_ARGS;
    }
    changedAssets.tableName = info.tableName;
    changedAssets.type = ChangedDataType::ASSET;
    changedAssets.field = pKColNames;
    // Get AssetDownloadList
    DownloadList downloadList;
    DownloadList completeDeletedList;
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        downloadList = currentContext_.assetDownloadList.downloadList;
        completeDeletedList = currentContext_.assetDownloadList.completeDownloadList;
    }
    // Download data (include deleting) will handle return Code in this situation
    int ret = CloudDbDownloadAssets(info, downloadList, true, dupHashKeySet, changedAssets);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Can not download assets or can not handle download result %d", ret);
        return ret;
    }
    // Download data (include deleting), won't handle return Code in this situation
    ret = CloudDbDownloadAssets(info, completeDeletedList, false, dupHashKeySet, changedAssets);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Can not download assets or can not handle download result for deleted record %d", ret);
    }
    return ret;
}

std::map<std::string, Assets> CloudSyncer::GetAssetsFromVBucket(VBucket &data)
{
    std::map<std::string, Assets> assets;
    std::vector<Field> fields;
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        fields = currentContext_.assetFields[currentContext_.tableName];
    }
    for (const auto &field : fields) {
        if (data.find(field.colName) != data.end()) {
            if (field.type == TYPE_INDEX<Asset> && data[field.colName].index() == TYPE_INDEX<Asset>) {
                assets[field.colName] = { std::get<Asset>(data[field.colName]) };
            } else if (field.type == TYPE_INDEX<Assets> && data[field.colName].index() == TYPE_INDEX<Assets>) {
                assets[field.colName] = std::get<Assets>(data[field.colName]);
            } else {
                Assets emptyAssets;
                assets[field.colName] = emptyAssets;
            }
        }
    }
    return assets;
}

int CloudSyncer::TagStatus(bool isExist, SyncParam &param, size_t idx, DataInfo &dataInfo, VBucket &localAssetInfo)
{
    OpType strategyOpResult = OpType::NOT_HANDLE;
    int errCode = TagStatusByStrategy(isExist, param, dataInfo, strategyOpResult);
    if (errCode != E_OK) {
        return errCode;
    }
    param.downloadData.opType[idx] = strategyOpResult;
    if (!IsDataContainAssets()) {
        return E_OK;
    }
    Key hashKey;
    if (isExist) {
        hashKey = dataInfo.localInfo.logInfo.hashKey;
    }
    return TagDownloadAssets(hashKey, idx, param, dataInfo, localAssetInfo);
}

int CloudSyncer::TagDownloadAssets(const Key &hashKey, size_t idx, SyncParam &param, DataInfo &dataInfo,
    VBucket &localAssetInfo)
{
    int ret = E_OK;
    OpType strategy = param.downloadData.opType[idx];
    switch (strategy) {
        case OpType::INSERT:
        case OpType::UPDATE:
        case OpType::DELETE:
            ret = HandleTagAssets(hashKey, idx, param, dataInfo, localAssetInfo);
            break;
        case OpType::NOT_HANDLE:
        case OpType::ONLY_UPDATE_GID:
        case OpType::SET_CLOUD_FORCE_PUSH_FLAG_ZERO: { // means upload need this data
            // Save the asset info into context
            std::map<std::string, Assets> assetsMap = GetAssetsFromVBucket(param.downloadData.data[idx]);
            {
                std::lock_guard<std::mutex> autoLock(contextLock_);
                if (currentContext_.assetsInfo.find(param.tableName) == currentContext_.assetsInfo.end()) {
                    currentContext_.assetsInfo[param.tableName] = {};
                }
                currentContext_.assetsInfo[param.tableName][dataInfo.cloudLogInfo.cloudGid] = assetsMap;
            }
            break;
        }
        default:
            break;
    }
    return ret;
}

int CloudSyncer::HandleTagAssets(const Key &hashKey, size_t idx, SyncParam &param, DataInfo &dataInfo,
    VBucket &localAssetInfo)
{
    Type prefix;
    std::vector<Type> pkVals;
    OpType strategy = param.downloadData.opType[idx];
    bool isDelStrategy = (strategy == OpType::DELETE);
    int ret = GetCloudPkVals(isDelStrategy ? dataInfo.localInfo.primaryKeys : param.downloadData.data[idx],
        param.pkColNames, dataInfo.localInfo.logInfo.dataKey, pkVals);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] HandleTagAssets cannot get primary key value list. %d", ret);
        return ret;
    }
    prefix = param.isSinglePrimaryKey ? pkVals[0] : prefix;
    if (param.isSinglePrimaryKey && prefix.index() == TYPE_INDEX<Nil>) {
        LOGE("[CloudSyncer] Invalid primary key type in TagStatus, it's Nil.");
        return -E_INTERNAL_ERROR;
    }
    std::map<std::string, Assets> assetsMap = TagAssetsInSingleRecord(param.downloadData.data[idx], localAssetInfo,
        false, ret);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] TagAssetsInSingleRecord report ERROR");
        return ret;
    }
    if (isDelStrategy) {
        param.assetsDownloadList.completeDownloadList.push_back(
            std::make_tuple(dataInfo.cloudLogInfo.cloudGid, prefix, strategy, assetsMap, hashKey, pkVals));
    } else {
        if (!param.isSinglePrimaryKey && strategy == OpType::INSERT) {
            param.withoutRowIdData.assetInsertData.push_back(std::make_tuple(idx,
                param.assetsDownloadList.downloadList.size()));
        }
        param.assetsDownloadList.downloadList.push_back(
            std::make_tuple(dataInfo.cloudLogInfo.cloudGid, prefix, strategy, assetsMap, hashKey, pkVals));
    }
    return ret;
}

int CloudSyncer::SaveDatum(SyncParam &param, size_t idx, std::vector<std::pair<Key, size_t>> &deletedList)
{
    int ret = PreHandleData(param.downloadData.data[idx], param.pkColNames);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Invalid download data:%d", ret);
        return ret;
    }
    ModifyCloudDataTime(param.downloadData.data[idx]);
    DataInfo dataInfo;
    VBucket localAssetInfo;
    bool isExist = true;
    ret = storageProxy_->GetInfoByPrimaryKeyOrGid(param.tableName, param.downloadData.data[idx], dataInfo.localInfo,
        localAssetInfo);
    if (ret == -E_NOT_FOUND) {
        isExist = false;
    } else if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot get info by primary key or gid: %d.", ret);
        return ret;
    }
    // Get cloudLogInfo from cloud data
    dataInfo.cloudLogInfo = GetCloudLogInfo(param.downloadData.data[idx]);
    // Tag datum to get opType
    ret = TagStatus(isExist, param, idx, dataInfo, localAssetInfo);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot tag status: %d.", ret);
        return ret;
    }
    ret = SaveChangedData(param, idx, dataInfo, deletedList);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot save changed data: %d.", ret);
    }
    return ret;
}

void CloudSyncer::ClearWithoutData(SyncParam &param)
{
    param.withoutRowIdData.insertData.clear();
    param.withoutRowIdData.updateData.clear();
    param.withoutRowIdData.assetInsertData.clear();
}

int CloudSyncer::SaveData(SyncParam &param)
{
    if (!IsChngDataEmpty(param.changedData)) {
        LOGE("[CloudSyncer] changedData.primaryData should have no member inside.");
        return -E_INVALID_ARGS;
    }
    // Update download batch Info
    param.info.downLoadInfo.batchIndex += 1;
    param.info.downLoadInfo.total += param.downloadData.data.size();
    int ret = E_OK;
    AssetDownloadList assetsDownloadList;
    param.assetsDownloadList = assetsDownloadList;
    param.deletePrimaryKeySet.clear();
    param.dupHashKeySet.clear();
    ClearWithoutData(param);
    std::vector<std::pair<Key, size_t>> deletedList;
    for (size_t i = 0; i < param.downloadData.data.size(); i++) {
        ret = SaveDatum(param, i, deletedList);
        if (ret != E_OK) {
            param.info.downLoadInfo.failCount += param.downloadData.data.size();
            LOGE("[CloudSyncer] Cannot save datum due to error code %d", ret);
            return ret;
        }
    }
    // Save assetsMap into current context
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        currentContext_.assetDownloadList = param.assetsDownloadList;
    }
    // save the data to the database by batch, downloadData will return rowid when insert data.
    ret = storageProxy_->PutCloudSyncData(param.tableName, param.downloadData);
    if (ret != E_OK) {
        param.info.downLoadInfo.failCount += param.downloadData.data.size();
        LOGE("[CloudSyncer] Cannot save the data to database with error code: %d.", ret);
        return ret;
    }
    ret = UpdateChangedData(param, currentContext_.assetDownloadList);
    if (ret != E_OK) {
        param.info.downLoadInfo.failCount += param.downloadData.data.size();
        LOGE("[CloudSyncer] Cannot update changed data: %d.", ret);
        return ret;
    }
    // Update downloadInfo
    param.info.downLoadInfo.successCount += param.downloadData.data.size();
    // Get latest cloudWaterMark
    VBucket &lastData = param.downloadData.data.back();
    param.cloudWaterMark = std::get<std::string>(lastData[CloudDbConstant::CURSOR_FIELD]);
    return E_OK;
}

int CloudSyncer::PreCheck(CloudSyncer::TaskId &taskId, const TableName &tableName)
{
    // Check Input and Context Validity
    int ret = CheckTaskIdValid(taskId);
    if (ret != E_OK) {
        return ret;
    }
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        if (cloudTaskInfos_.find(taskId) == cloudTaskInfos_.end()) {
            LOGE("[CloudSyncer] Cloud Task Info does not exist taskId: , %" PRIu64 ".", taskId);
            return -E_INVALID_ARGS;
        }
    }
    if (currentContext_.strategy == nullptr) {
        LOGE("[CloudSyncer] Strategy has not been initialized");
        return -E_INVALID_ARGS;
    }
    ret = storageProxy_->CheckSchema(tableName);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] A schema error occurred on the table to be synced, %d", ret);
        return ret;
    }
    return E_OK;
}

bool CloudSyncer::NeedNotifyChangedData(const ChangedData &changedData)
{
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        if (IsModeForcePush(currentContext_.currentTaskId)) {
            return false;
        }
    }
    // when there have no data been changed, it needn't notified
    if (changedData.primaryData[OP_INSERT].empty() && changedData.primaryData[OP_UPDATE].empty() &&
        changedData.primaryData[OP_DELETE].empty()) {
            return false;
        }
    return true;
}

int CloudSyncer::NotifyChangedData(ChangedData &&changedData)
{
    if (!NeedNotifyChangedData(changedData)) {
        return E_OK;
    }
    std::string deviceName;
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        std::vector<std::string> devices = currentContext_.notifier->GetDevices();
        if (devices.empty()) {
            LOGE("[CloudSyncer] CurrentContext do not contain device info");
            return -E_CLOUD_ERROR;
        }
        // We use first device name as the target of NotifyChangedData
        deviceName = devices[0];
    }
    int ret = storageProxy_->NotifyChangedData(deviceName, std::move(changedData));
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot notify changed data while downloading, %d.", ret);
    }
    return ret;
}

void CloudSyncer::NotifyInDownload(CloudSyncer::TaskId taskId, SyncParam &param)
{
    CloudTaskInfo taskInfo;
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        taskInfo = cloudTaskInfos_[taskId];
    }
    std::lock_guard<std::mutex> autoLock(contextLock_);

    if (currentContext_.strategy->JudgeUpload()) {
        currentContext_.notifier->NotifyProcess(taskInfo, param.info);
    } else {
        if (param.isLastBatch) {
            param.info.tableStatus = ProcessStatus::FINISHED;
        }
        if (taskInfo.table.back() == param.tableName && param.isLastBatch) {
            currentContext_.notifier->UpdateProcess(param.info);
        } else {
            currentContext_.notifier->NotifyProcess(taskInfo, param.info);
        }
    }
}

int CloudSyncer::SaveDataInTransaction(CloudSyncer::TaskId taskId, SyncParam &param)
{
    int ret = storageProxy_->StartTransaction(TransactType::IMMEDIATE);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot start a transaction: %d.", ret);
        return ret;
    }
    if (!IsModeForcePush(taskId)) {
        param.changedData.tableName = param.info.tableName;
        param.changedData.field = param.pkColNames;
        param.changedData.type = ChangedDataType::DATA;
    }
    ret = SaveData(param);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] cannot save data: %d.", ret);
        int rollBackErrorCode = storageProxy_->Rollback();
        if (rollBackErrorCode != E_OK) {
            LOGE("[CloudSyncer] cannot roll back transaction: %d.", rollBackErrorCode);
        } else {
            LOGI("[CloudSyncer] Roll back transaction success: %d.", ret);
        }
        return ret;
    }
    ret = storageProxy_->Commit();
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot commit a transaction: %d.", ret);
    }
    return ret;
}

int CloudSyncer::SaveDataNotifyProcess(CloudSyncer::TaskId taskId, SyncParam &param)
{
    ChangedData changedData;
    param.changedData = changedData;
    param.downloadData.opType.resize(param.downloadData.data.size());
    int ret = SaveDataInTransaction(taskId, param);
    if (ret != E_OK) {
        return ret;
    }
    // call OnChange to notify changedData object first time (without Assets)
    ret = NotifyChangedData(std::move(param.changedData));
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot notify changed data due to error %d", ret);
        return ret;
    }
    // Begin downloading assets
    ChangedData changedAssets;
    ret = DownloadAssets(param.info, param.pkColNames, param.dupHashKeySet, changedAssets);
    (void)NotifyChangedData(std::move(changedAssets));
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot notify downloadAssets due to error %d", ret);
        return ret;
    }
    UpdateCloudWaterMark(param);
    return E_OK;
}

void CloudSyncer::NotifyInBatchUpload(const UploadParam &uploadParam, const InnerProcessInfo &innerProcessInfo,
    bool lastBatch)
{
    CloudTaskInfo taskInfo;
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        taskInfo = cloudTaskInfos_[uploadParam.taskId];
    }
    std::lock_guard<std::mutex> autoLock(contextLock_);
    if (uploadParam.lastTable && lastBatch) {
        currentContext_.notifier->UpdateProcess(innerProcessInfo);
    } else {
        currentContext_.notifier->NotifyProcess(taskInfo, innerProcessInfo);
    }
}

int CloudSyncer::DoDownload(CloudSyncer::TaskId taskId)
{
    SyncParam param;
    int ret = GetCurrentTableName(param.tableName);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Invalid table name for syncing: %d", ret);
        return ret;
    }
    param.info.tableName = param.tableName;
    std::vector<Field> assetFields;
    // only no primary key and composite primary key contains rowid.
    ret = storageProxy_->GetPrimaryColNamesWithAssetsFields(param.tableName, param.pkColNames, assetFields);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Cannot get primary column names: %d", ret);
        return ret;
    }
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        currentContext_.assetFields[currentContext_.tableName] = assetFields;
    }
    param.isSinglePrimaryKey = IsSinglePrimaryKey(param.pkColNames);
    param.cloudWaterMark = "";
    if (!IsModeForcePull(taskId)) {
        ret = storageProxy_->GetCloudWaterMark(param.tableName, param.cloudWaterMark);
        if (ret != E_OK) {
            LOGE("[CloudSyncer] Cannot get cloud water level from cloud meta data: %d.", ret);
            return ret;
        }
    }
    return DoDownloadInner(taskId, param);
}

int CloudSyncer::DoDownloadInner(CloudSyncer::TaskId taskId, SyncParam &param)
{
    // Query data by batch until reaching end and not more data need to be download
    int ret = PreCheck(taskId, param.info.tableName);
    if (ret != E_OK) {
        return ret;
    }
    bool queryEnd = false;
    while (!queryEnd) {
        // Get cloud data after cloud water mark
        param.info.tableStatus = ProcessStatus::PROCESSING;
        DownloadData downloadData;
        param.downloadData = downloadData;
        param.isLastBatch = false;
        ret = QueryCloudData(param.info.tableName, param.cloudWaterMark, param.downloadData);
        if (ret == -E_QUERY_END) {
            // Won't break here since downloadData may not be null
            queryEnd = true;
            param.isLastBatch = true;
        } else if (ret != E_OK) {
            std::lock_guard<std::mutex> autoLock(contextLock_);
            param.info.tableStatus = ProcessStatus::FINISHED;
            currentContext_.notifier->UpdateProcess(param.info);
            return ret;
        }
        if (param.downloadData.data.empty()) {
            if (ret == E_OK) {
                LOGD("[CloudSyncer] try to query cloud data use increment water mark");
                UpdateCloudWaterMark(param);
                continue;
            }
            NotifyInEmptyDownload(taskId, param.info);
            break;
        }
        // Save data in transaction, update cloud water mark, notify process and changed data
        ret = SaveDataNotifyProcess(taskId, param);
        if (ret != E_OK) {
            std::lock_guard<std::mutex> autoLock(contextLock_);
            param.info.tableStatus = ProcessStatus::FINISHED;
            currentContext_.notifier->UpdateProcess(param.info);
            return ret;
        }
        (void)NotifyInDownload(taskId, param);
    }
    return E_OK;
}

void CloudSyncer::NotifyInEmptyDownload(CloudSyncer::TaskId taskId, InnerProcessInfo &info)
{
    std::lock_guard<std::mutex> autoLock(contextLock_);
    if (currentContext_.strategy->JudgeUpload()) {
        currentContext_.notifier->NotifyProcess(cloudTaskInfos_[taskId], info);
    } else {
        info.tableStatus = FINISHED;
        if (cloudTaskInfos_[taskId].table.back() == info.tableName) {
            currentContext_.notifier->UpdateProcess(info);
        } else {
            currentContext_.notifier->NotifyProcess(cloudTaskInfos_[taskId], info);
        }
    }
}

int CloudSyncer::PreCheckUpload(CloudSyncer::TaskId &taskId, const TableName &tableName, Timestamp &localMark)
{
    int ret = PreCheck(taskId, tableName);
    if (ret != E_OK) {
        return ret;
    }
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        if (cloudTaskInfos_.find(taskId) == cloudTaskInfos_.end()) {
            LOGE("[CloudSyncer] Cloud Task Info does not exist taskId: %" PRIu64 ".", taskId);
            return -E_INVALID_ARGS;
        }
        if ((cloudTaskInfos_[taskId].mode < SYNC_MODE_CLOUD_MERGE) ||
            (cloudTaskInfos_[taskId].mode > SYNC_MODE_CLOUD_FORCE_PUSH)) {
            LOGE("[CloudSyncer] Upload failed, invalid sync mode: %d.",
                static_cast<int>(cloudTaskInfos_[taskId].mode));
            return -E_INVALID_ARGS;
        }
    }

    if (!IsModeForcePush(taskId)) {
        ret = storageProxy_->GetLocalWaterMark(tableName, localMark);
        if (ret != E_OK) {
            LOGE("[CloudSyncer] Failed to get local water mark when upload, %d.", ret);
        }
    }
    return ret;
}

bool CloudSyncer::CheckCloudSyncDataEmpty(const CloudSyncData &uploadData)
{
    return uploadData.insData.extend.empty() && uploadData.insData.record.empty() &&
           uploadData.updData.extend.empty() && uploadData.updData.record.empty() &&
           uploadData.delData.extend.empty() && uploadData.delData.record.empty();
}

int CloudSyncer::DoBatchUpload(CloudSyncData &uploadData, UploadParam &uploadParam, InnerProcessInfo &innerProcessInfo)
{
    int errCode = E_OK;
    Info insertInfo;
    Info updateInfo;
    Info deleteInfo;

    if (!uploadData.delData.record.empty() && !uploadData.delData.extend.empty()) {
        errCode = cloudDB_.BatchDelete(uploadData.tableName, uploadData.delData.record,
            uploadData.delData.extend, deleteInfo);
        if (errCode != E_OK) {
            return errCode;
        }
        innerProcessInfo.upLoadInfo.successCount += deleteInfo.successCount;
    }

    if (!uploadData.insData.record.empty() && !uploadData.insData.extend.empty()) {
        errCode = cloudDB_.BatchInsert(uploadData.tableName, uploadData.insData.record,
            uploadData.insData.extend, insertInfo);
        if (errCode != E_OK) {
            return errCode;
        }
        // we need to fill back gid after insert data to cloud.
        int ret = storageProxy_->FillCloudGidAndAsset(OpType::INSERT, uploadData);
        if (ret != E_OK) {
            LOGE("[CloudSyncer] Failed to fill back when doing upload insData, %d.", ret);
            return ret;
        }
        innerProcessInfo.upLoadInfo.successCount += insertInfo.successCount;
    }

    if (!uploadData.updData.record.empty() && !uploadData.updData.extend.empty()) {
        errCode = cloudDB_.BatchUpdate(uploadData.tableName, uploadData.updData.record,
            uploadData.updData.extend, updateInfo);
        if (errCode != E_OK) {
            return errCode;
        }
        errCode = storageProxy_->FillCloudGidAndAsset(OpType::UPDATE, uploadData);
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] Failed to fill back when doing upload updData, %d.", errCode);
            return errCode;
        }
        innerProcessInfo.upLoadInfo.successCount += updateInfo.successCount;
    }
    bool lastBatch = innerProcessInfo.upLoadInfo.successCount == innerProcessInfo.upLoadInfo.total;
    if (lastBatch) {
        innerProcessInfo.tableStatus = ProcessStatus::FINISHED;
    }
    // After each batch upload successed, call NotifyProcess
    NotifyInBatchUpload(uploadParam, innerProcessInfo, lastBatch);

    // if batch upload successed, update local water mark
    // The cloud water mark cannot be updated here, because the cloud api doesn't return cursor here.
    errCode = PutWaterMarkAfterBatchUpload(uploadData.tableName, uploadParam);
    if (errCode != E_OK) {
        LOGE("[CloudSyncer] Failed to set local water mark when doing upload, %d.", errCode);
    }
    return errCode;
}

int CloudSyncer::PutWaterMarkAfterBatchUpload(const std::string &tableName, UploadParam &uploadParam)
{
    int errCode = E_OK;
    // if we use local cover cloud strategy, it won't update local water mark also.
    if (IsModeForcePush(uploadParam.taskId)) {
        return E_OK;
    }
    errCode = storageProxy_->PutLocalWaterMark(tableName, uploadParam.localMark);
    if (errCode != E_OK) {
        LOGE("[CloudSyncer] Cannot set local water mark while Uploading, %d.", errCode);
    }
    return errCode;
}

int CloudSyncer::DoUpload(CloudSyncer::TaskId taskId, bool lastTable)
{
    std::string tableName;
    int ret = GetCurrentTableName(tableName);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Invalid table name for syncing: %d", ret);
        return ret;
    }

    Timestamp localMark = 0u;
    ret = PreCheckUpload(taskId, tableName, localMark);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Doing upload sync pre check failed, %d.", ret);
        return ret;
    }

    int64_t count = 0;
    ret = storageProxy_->GetUploadCount(tableName, localMark, IsModeForcePush(taskId), count);
    if (ret != E_OK) {
        // GetUploadCount will return E_OK when upload count is zero.
        LOGE("[CloudSyncer] Failed to get Upload Data Count, %d.", ret);
        return ret;
    }
    if (count == 0) {
        LOGI("[CloudSyncer] There is no need to doing upload, as the upload data count is zero.");
        InnerProcessInfo innerProcessInfo;
        innerProcessInfo.tableName = tableName;
        innerProcessInfo.upLoadInfo.total = 0;  // count is zero
        innerProcessInfo.tableStatus = ProcessStatus::FINISHED;
        {
            std::lock_guard<std::mutex> autoLock(contextLock_);
            if (lastTable) {
                currentContext_.notifier->UpdateProcess(innerProcessInfo);
            } else {
                currentContext_.notifier->NotifyProcess(cloudTaskInfos_[taskId], innerProcessInfo);
            }
        }
        return E_OK;
    }
    UploadParam param;
    param.count = count;
    param.localMark = localMark;
    param.lastTable = lastTable;
    param.taskId = taskId;
    return DoUploadInner(tableName, param);
}

int CloudSyncer::TagUploadAssets(CloudSyncData &uploadData)
{
    int errCode = E_OK;
    if (!IsDataContainAssets()) {
        return E_OK;
    }
    std::map<std::string, std::map<std::string, Assets>> cloudAssets;
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        cloudAssets = currentContext_.assetsInfo[currentContext_.tableName];
    }
    // for delete scenario, assets should not appear in the records. Thereby we needn't tag the assests.
    // for insert scenario, gid does not exist. Thereby, we needn't compare with cloud asset get in download procedure
    for (size_t i = 0; i < uploadData.insData.extend.size(); i++) {
        VBucket cloudAsset; // cloudAsset must be empty
        (void)TagAssetsInSingleRecord(uploadData.insData.record[i], cloudAsset, true, errCode);
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] TagAssetsInSingleRecord report ERROR in DELETE/INSERT option");
            return errCode;
        }
    }
    // for update scenario, assets shoulb be compared with asset get in download procedure.
    for (size_t i = 0; i < uploadData.updData.extend.size(); i++) {
        VBucket cloudAsset;
        // gid must exist in UPDATE scenario, cause we have re-fill gid during download procedure
        // But we need to check for safety
        auto gidIter = uploadData.updData.extend[i].find(CloudDbConstant::GID_FIELD);
        if (gidIter == uploadData.updData.extend[i].end()) {
            LOGE("[CloudSyncer] Datum to be upload must contain gid");
            return -E_INVALID_DATA;
        }
        // update data must contain gid, however, we could only pull data after water mark
        // Therefore, we need to check whether we contain the data
        std::string &gid = std::get<std::string>(gidIter->second);
        if (cloudAssets.find(gid) == cloudAssets.end()) {
            // In this case, we directly upload data without compartion and tagging
            std::vector<Field> assetFields;
            {
                std::lock_guard<std::mutex> autoLock(contextLock_);
                assetFields = currentContext_.assetFields[currentContext_.tableName];
            }
            StatusToFlagForAssetsInRecord(assetFields, uploadData.updData.record[i]);
            continue;
        }
        for (const auto &it : cloudAssets[gid]) {
            cloudAsset[it.first] = it.second;
        }
        (void)TagAssetsInSingleRecord(uploadData.updData.record[i], cloudAsset, true, errCode);
        if (errCode != E_OK) {
            LOGE("[CloudSyncer] TagAssetsInSingleRecord report ERROR in UPDATE option");
            return errCode;
        }
    }
    return E_OK;
}

int CloudSyncer::PreProcessBatchUpload(TaskId taskId, const InnerProcessInfo &innerProcessInfo,
    CloudSyncData &uploadData, Timestamp &localMark)
{
    // Precheck and calculate local water mark which would be updated if batch upload successed.
    int ret = CheckTaskIdValid(taskId);
    if (ret != E_OK) {
        return ret;
    }
    ret = CheckCloudSyncDataValid(uploadData, innerProcessInfo.tableName, innerProcessInfo.upLoadInfo.total, taskId);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Invalid Cloud Sync Data of Upload, %d.", ret);
        return ret;
    }
    ret = TagUploadAssets(uploadData);
    if (ret != E_OK) {
        LOGE("TagUploadAssets report ERROR, cannot tag uploadAssets");
        return ret;
    }
    // get local water mark to be updated in future.
    ret = UpdateExtendTime(uploadData, innerProcessInfo.upLoadInfo.total, taskId, localMark);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Failed to get new local water mark in Cloud Sync Data, %d.", ret);
    }
    return ret;
}

int CloudSyncer::SaveCloudWaterMark(const TableName &tableName)
{
    std::string cloudWaterMark;
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        if (currentContext_.cloudWaterMarks.find(tableName) == currentContext_.cloudWaterMarks.end()) {
            LOGD("[CloudSyncer] Not found water mark just return");
            return E_OK;
        }
        cloudWaterMark = currentContext_.cloudWaterMarks[tableName];
    }
    int errCode = storageProxy_->SetCloudWaterMark(tableName, cloudWaterMark);
    if (errCode != E_OK) {
        LOGE("[CloudSyncer] Cannot set cloud water mark while Uploading, %d.", errCode);
    }
    return errCode;
}

void CloudSyncer::SetUploadDataFlag(const TaskId taskId, CloudSyncData& uploadData)
{
    std::lock_guard<std::mutex> autoLock(queueLock_);
    uploadData.isCloudForcePushStrategy = (cloudTaskInfos_[taskId].mode == SYNC_MODE_CLOUD_FORCE_PUSH);
}

bool CloudSyncer::IsModeForcePush(const TaskId taskId)
{
    std::lock_guard<std::mutex> autoLock(queueLock_);
    return cloudTaskInfos_[taskId].mode == SYNC_MODE_CLOUD_FORCE_PUSH;
}

bool CloudSyncer::IsModeForcePull(const TaskId taskId)
{
    std::lock_guard<std::mutex> autoLock(queueLock_);
    return cloudTaskInfos_[taskId].mode == SYNC_MODE_CLOUD_FORCE_PULL;
}

int CloudSyncer::DoUploadInner(const std::string &tableName, UploadParam &uploadParam)
{
    ContinueToken continueStmtToken = nullptr;
    CloudSyncData uploadData(tableName);
    SetUploadDataFlag(uploadParam.taskId, uploadData);

    int ret = storageProxy_->GetCloudData(tableName, uploadParam.localMark, continueStmtToken, uploadData);
    if ((ret != E_OK) && (ret != -E_UNFINISHED)) {
        LOGE("[CloudSyncer] Failed to get cloud data when upload, %d.", ret);
        return ret;
    }

    InnerProcessInfo info;
    info.tableName = tableName;
    info.tableStatus = ProcessStatus::PROCESSING;
    info.upLoadInfo.total = static_cast<uint32_t>(uploadParam.count);
    uint32_t batchIndex = 0;
    bool getDataUnfinished = false;

    while (!CheckCloudSyncDataEmpty(uploadData)) {
        getDataUnfinished = (ret == -E_UNFINISHED);
        ret = PreProcessBatchUpload(uploadParam.taskId, info, uploadData, uploadParam.localMark);
        if (ret != E_OK) {
            break;
        }
        info.upLoadInfo.batchIndex = ++batchIndex;

        ret = DoBatchUpload(uploadData, uploadParam, info);
        if (ret != E_OK) {
            LOGE("[CloudSyncer] Failed to do upload, %d", ret);
            info.upLoadInfo.failCount = info.upLoadInfo.total - info.upLoadInfo.successCount;
            info.tableStatus = ProcessStatus::FINISHED;
            {
                std::lock_guard<std::mutex> autoLock(contextLock_);
                currentContext_.notifier->UpdateProcess(info);
            }
            break;
        }

        uploadData = CloudSyncData(tableName);

        if (continueStmtToken == nullptr) {
            break;
        }
        SetUploadDataFlag(uploadParam.taskId, uploadData);

        ret = storageProxy_->GetCloudDataNext(continueStmtToken, uploadData);
        if ((ret != E_OK) && (ret != -E_UNFINISHED)) {
            LOGE("[CloudSyncer] Failed to get cloud data next when doing upload, %d.", ret);
            break;
        }
    }

    if (getDataUnfinished) {
        storageProxy_->ReleaseContinueToken(continueStmtToken);
    }
    return ret;
}

int CloudSyncer::PreHandleData(VBucket &datum, const std::vector<std::string> &pkColNames)
{
    // type index of field in fields
    std::vector<std::pair<std::string, int32_t>> fieldAndIndex = {
        std::pair<std::string, int32_t>(CloudDbConstant::GID_FIELD, TYPE_INDEX<std::string>),
        std::pair<std::string, int32_t>(CloudDbConstant::CREATE_FIELD, TYPE_INDEX<int64_t>),
        std::pair<std::string, int32_t>(CloudDbConstant::MODIFY_FIELD, TYPE_INDEX<int64_t>),
        std::pair<std::string, int32_t>(CloudDbConstant::DELETE_FIELD, TYPE_INDEX<bool>),
        std::pair<std::string, int32_t>(CloudDbConstant::CURSOR_FIELD, TYPE_INDEX<std::string>)
    };

    for (const auto &fieldIndex : fieldAndIndex) {
        if (datum.find(fieldIndex.first) == datum.end()) {
            LOGE("[CloudSyncer] Cloud data do not contain expected field: %s.", fieldIndex.first.c_str());
            return -E_CLOUD_ERROR;
        }
        if (datum[fieldIndex.first].index() != static_cast<size_t>(fieldIndex.second)) {
            LOGE("[CloudSyncer] Cloud data's field: %s, doesn't has expected type.", fieldIndex.first.c_str());
            return -E_CLOUD_ERROR;
        }
    }

    if (std::get<bool>(datum[CloudDbConstant::DELETE_FIELD])) {
        RemoveDataExceptExtendInfo(datum, pkColNames);
    }
    std::lock_guard<std::mutex> autoLock(contextLock_);
    if (IsDataContainDuplicateAsset(currentContext_.assetFields[currentContext_.tableName], datum)) {
        LOGE("[CloudSyncer] Cloud data contain duplicate asset");
        return -E_CLOUD_ERROR;
    }
    return E_OK;
}

int CloudSyncer::QueryCloudData(const std::string &tableName, std::string &cloudWaterMark,
    DownloadData &downloadData)
{
    VBucket extend = {
        {CloudDbConstant::CURSOR_FIELD, cloudWaterMark}
    };
    int ret = cloudDB_.Query(tableName, extend, downloadData.data);
    if (ret == -E_QUERY_END) {
        LOGD("[CloudSyncer] Download data from cloud database success and no more data need to be downloaded");
        return -E_QUERY_END;
    }
    if (ret == E_OK && downloadData.data.empty()) {
        if (extend[CloudDbConstant::CURSOR_FIELD].index() != TYPE_INDEX<std::string>) {
            LOGE("[CloudSyncer] cursor type is not valid=%d", extend[CloudDbConstant::CURSOR_FIELD].index());
            return -E_CLOUD_ERROR;
        }
        cloudWaterMark = std::get<std::string>(extend[CloudDbConstant::CURSOR_FIELD]);
        LOGD("[CloudSyncer] Download data is empty, try to use other cursor=%s", cloudWaterMark.c_str());
        return ret;
    }
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Download data from cloud database unsuccess %d", ret);
    }
    return ret;
}

int CloudSyncer::CheckParamValid(const std::vector<DeviceID> &devices, SyncMode mode)
{
    if (devices.size() != 1) {
        LOGE("[CloudSyncer] invalid devices size %zu", devices.size());
        return -E_INVALID_ARGS;
    }
    for (const auto &dev: devices) {
        if (dev.empty() || dev.size() > DBConstant::MAX_DEV_LENGTH) {
            LOGE("[CloudSyncer] invalid device, size %zu", dev.size());
            return -E_INVALID_ARGS;
        }
    }
    if (mode >= SyncMode::SYNC_MODE_PUSH_ONLY && mode < SyncMode::SYNC_MODE_CLOUD_MERGE) {
        LOGE("[CloudSyncer] not support mode %d", static_cast<int>(mode));
        return -E_NOT_SUPPORT;
    }
    if (mode < SyncMode::SYNC_MODE_PUSH_ONLY || mode > SyncMode::SYNC_MODE_CLOUD_FORCE_PULL) {
        LOGE("[CloudSyncer] invalid mode %d", static_cast<int>(mode));
        return -E_INVALID_ARGS;
    }
    return E_OK;
}

int CloudSyncer::CheckTaskIdValid(TaskId taskId)
{
    if (closed_) {
        LOGE("[CloudSyncer] DB is closed.");
        return -E_DB_CLOSED;
    }
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        if (cloudTaskInfos_.find(taskId) == cloudTaskInfos_.end()) {
            LOGE("[CloudSyncer] not found task.");
            return -E_INVALID_ARGS;
        }
        if (cloudTaskInfos_[taskId].errCode != E_OK) {
            return cloudTaskInfos_[taskId].errCode;
        }
    }
    std::lock_guard<std::mutex> autoLock(contextLock_);
    return currentContext_.currentTaskId == taskId ? E_OK : -E_INVALID_ARGS;
}

int CloudSyncer::GetCurrentTableName(std::string &tableName)
{
    std::lock_guard<std::mutex> autoLock(contextLock_);
    if (currentContext_.tableName.empty()) {
        return -E_BUSY;
    }
    tableName = currentContext_.tableName;
    return E_OK;
}

int CloudSyncer::TryToAddSyncTask(CloudTaskInfo &&taskInfo)
{
    if (closed_) {
        LOGW("[CloudSyncer] syncer is closed, should not sync now");
        return -E_DB_CLOSED;
    }
    std::lock_guard<std::mutex> autoLock(queueLock_);
    int errCode = CheckQueueSizeWithNoLock();
    if (errCode != E_OK) {
        return errCode;
    }
    do {
        currentTaskId_++;
    } while (currentTaskId_ == 0);
    taskInfo.taskId = currentTaskId_;
    taskQueue_.push_back(currentTaskId_);
    cloudTaskInfos_[currentTaskId_] = taskInfo;
    LOGI("[CloudSyncer] Add task ok, taskId %" PRIu64, cloudTaskInfos_[currentTaskId_].taskId);
    return E_OK;
}

int CloudSyncer::CheckQueueSizeWithNoLock()
{
    int32_t limit = queuedManualSyncLimit_;
    if (taskQueue_.size() >= static_cast<size_t>(limit)) {
        LOGW("[CloudSyncer] too much sync task");
        return -E_BUSY;
    }
    return E_OK;
}

int CloudSyncer::PrepareSync(TaskId taskId)
{
    std::vector<std::string> tableNames;
    std::vector<std::string> devices;
    SyncMode mode;
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        if (closed_ || cloudTaskInfos_.find(taskId) == cloudTaskInfos_.end()) {
            LOGW("[CloudSyncer] Abort sync because syncer is closed");
            return -E_DB_CLOSED;
        }
        tableNames = cloudTaskInfos_[taskId].table;
        mode = cloudTaskInfos_[taskId].mode;
        devices = cloudTaskInfos_[taskId].devices;
    }
    {
        // check current task is running or not
        std::lock_guard<std::mutex> autoLock(contextLock_);
        if (closed_ || currentContext_.currentTaskId != INVALID_TASK_ID) {
            LOGW("[CloudSyncer] Abort sync because syncer is closed or another task is running");
            return -E_DB_CLOSED;
        }
        currentContext_.currentTaskId = taskId;
        currentContext_.notifier = std::make_shared<ProcessNotifier>(this);
        currentContext_.strategy = StrategyFactory::BuildSyncStrategy(mode);
        currentContext_.notifier->Init(tableNames, devices);
        LOGI("[CloudSyncer] exec taskId %" PRIu64, taskId);
    }
    std::lock_guard<std::mutex> autoLock(queueLock_);
    cloudTaskInfos_[taskId].status = ProcessStatus::PROCESSING;
    return E_OK;
}

int CloudSyncer::LockCloud(TaskId taskId)
{
    int period;
    {
        auto res = cloudDB_.Lock();
        if (res.first != E_OK) {
            return res.first;
        }
        period = static_cast<int>(res.second) / HEARTBEAT_PERIOD;
    }
    int errCode = StartHeartBeatTimer(period, taskId);
    if (errCode != E_OK) {
        UnlockCloud();
    }
    return errCode;
}

int CloudSyncer::UnlockCloud()
{
    FinishHeartBeatTimer();
    int errCode = cloudDB_.UnLock();
    WaitAllHeartBeatTaskExit();
    return errCode;
}

int CloudSyncer::StartHeartBeatTimer(int period, TaskId taskId)
{
    if (timerId_ != 0u) {
        LOGW("[CloudSyncer] HeartBeat timer has been start!");
        return E_OK;
    }
    TimerId timerId = 0;
    int errCode = RuntimeContext::GetInstance()->SetTimer(period, [this, taskId](TimerId timerId) {
        HeartBeat(timerId, taskId);
        return E_OK;
    }, nullptr, timerId);
    if (errCode != E_OK) {
        LOGE("[CloudSyncer] HeartBeat timer start failed %d", errCode);
        return errCode;
    }
    timerId_ = timerId;
    return E_OK;
}

void CloudSyncer::FinishHeartBeatTimer()
{
    if (timerId_ == 0u) {
        return;
    }
    RuntimeContext::GetInstance()->RemoveTimer(timerId_, true);
    timerId_ = 0u;
    LOGD("[CloudSyncer] Finish heartbeat timer ok");
}

void CloudSyncer::WaitAllHeartBeatTaskExit()
{
    std::unique_lock<std::mutex> uniqueLock(heartbeatMutex_);
    if (heartBeatCount_ <= 0) {
        return;
    }
    LOGD("[CloudSyncer] Begin wait all heartbeat task exit");
    heartbeatCv_.wait(uniqueLock, [this]() {
        return heartBeatCount_ <= 0;
    });
    LOGD("[CloudSyncer] End wait all heartbeat task exit");
}

void CloudSyncer::HeartBeat(TimerId timerId, TaskId taskId)
{
    if (timerId_ != timerId) {
        return;
    }
    {
        std::lock_guard<std::mutex> autoLock(heartbeatMutex_);
        heartBeatCount_++;
    }
    int errCode = RuntimeContext::GetInstance()->ScheduleTask([this, taskId]() {
        if (heartBeatCount_ >= HEARTBEAT_PERIOD) {
            // heartbeat block twice should finish task now
            SetTaskFailed(taskId, -E_CLOUD_ERROR);
        } else {
            int ret = cloudDB_.HeartBeat();
            if (ret != E_OK) {
                HeartBeatFailed(taskId, ret);
            } else {
                failedHeartBeatCount_ = 0;
            }
        }
        {
            std::lock_guard<std::mutex> autoLock(heartbeatMutex_);
            heartBeatCount_--;
        }
        heartbeatCv_.notify_all();
    });
    if (errCode != E_OK) {
        LOGW("[CloudSyncer] schedule heartbeat task failed %d", errCode);
        {
            std::lock_guard<std::mutex> autoLock(heartbeatMutex_);
            heartBeatCount_--;
        }
        heartbeatCv_.notify_all();
    }
}

void CloudSyncer::HeartBeatFailed(TaskId taskId, int errCode)
{
    failedHeartBeatCount_++;
    if (failedHeartBeatCount_ < MAX_HEARTBEAT_FAILED_LIMIT) {
        return;
    }
    LOGW("[CloudSyncer] heartbeat failed too much times!");
    FinishHeartBeatTimer();
    SetTaskFailed(taskId, errCode);
}

void CloudSyncer::SetTaskFailed(TaskId taskId, int errCode)
{
    std::lock_guard<std::mutex> autoLock(queueLock_);
    if (cloudTaskInfos_.find(taskId) == cloudTaskInfos_.end()) {
        return;
    }
    if (cloudTaskInfos_[taskId].errCode != E_OK) {
        return;
    }
    cloudTaskInfos_[taskId].errCode = errCode;
}

int CloudSyncer::CheckCloudSyncDataValid(CloudSyncData uploadData, const std::string &tableName,
    const int64_t &count, TaskId &taskId)
{
    size_t insRecordLen = uploadData.insData.record.size();
    size_t insExtendLen = uploadData.insData.extend.size();
    size_t updRecordLen = uploadData.updData.record.size();
    size_t updExtendLen = uploadData.updData.extend.size();
    size_t delRecordLen = uploadData.delData.record.size();
    size_t delExtendLen = uploadData.delData.extend.size();

    bool syncDataValid = (uploadData.tableName == tableName) &&
        ((insRecordLen > 0 && insExtendLen > 0 && insRecordLen == insExtendLen) ||
        (updRecordLen > 0 && updExtendLen > 0 && updRecordLen == updExtendLen) ||
        (delRecordLen > 0 && delExtendLen > 0 && delRecordLen == delExtendLen));
    if (!syncDataValid) {
        LOGE("[CloudSyncer] upload data is empty but upload count is not zero or upload table name"
            " is not the same as table name of sync data.");
        return -E_INTERNAL_ERROR;
    }
    int64_t syncDataCount = static_cast<int64_t>(insRecordLen) + static_cast<int64_t>(updRecordLen) +
        static_cast<int64_t>(delRecordLen);
    if (syncDataCount > count) {
        LOGE("[CloudSyncer] Size of a batch of sync data is greater than upload data size.");
        return -E_INTERNAL_ERROR;
    }

    return E_OK;
}

int CloudSyncer::GetWaterMarkAndUpdateTime(std::vector<VBucket>& extend, Timestamp &waterMark)
{
    for (auto &extendData: extend) {
        if (extendData.empty() || extendData.find(CloudDbConstant::MODIFY_FIELD) == extendData.end()) {
            LOGE("[CloudSyncer] VBucket is empty or MODIFY_FIELD doesn't exist.");
            return -E_INTERNAL_ERROR;
        }
        if (TYPE_INDEX<int64_t> != extendData.at(CloudDbConstant::MODIFY_FIELD).index()) {
            LOGE("[CloudSyncer] VBucket's MODIFY_FIELD doestn't fit int64_t.");
            return -E_INTERNAL_ERROR;
        }
        if (extendData.empty() || extendData.find(CloudDbConstant::CREATE_FIELD) == extendData.end()) {
            LOGE("[CloudSyncer] VBucket is empty or MODIFY_FIELD doesn't exist.");
            return -E_INTERNAL_ERROR;
        }
        if (TYPE_INDEX<int64_t> != extendData.at(CloudDbConstant::CREATE_FIELD).index()) {
            LOGE("[CloudSyncer] VBucket's MODIFY_FIELD doestn't fit int64_t.");
            return -E_INTERNAL_ERROR;
        }
        waterMark = std::max(int64_t(waterMark), std::get<int64_t>(extendData.at(CloudDbConstant::MODIFY_FIELD)));
        int64_t modifyTime =
            std::get<int64_t>(extendData.at(CloudDbConstant::MODIFY_FIELD)) / CloudDbConstant::TEN_THOUSAND;
        int64_t createTime =
            std::get<int64_t>(extendData.at(CloudDbConstant::CREATE_FIELD)) / CloudDbConstant::TEN_THOUSAND;
        extendData.insert_or_assign(CloudDbConstant::MODIFY_FIELD, modifyTime);
        extendData.insert_or_assign(CloudDbConstant::CREATE_FIELD, createTime);
    }
    return E_OK;
}

// After doing a batch upload, we need to use CloudSyncData's maximum timestamp to update the water mark;
int CloudSyncer::UpdateExtendTime(CloudSyncData &uploadData, const int64_t &count,
    TaskId taskId, Timestamp &waterMark)
{
    int ret = CheckCloudSyncDataValid(uploadData, uploadData.tableName, count, taskId);
    if (ret != E_OK) {
        LOGE("[CloudSyncer] Invalid Sync Data when get local water mark.");
        return ret;
    }
    if (!uploadData.insData.extend.empty()) {
        if (uploadData.insData.record.size() != uploadData.insData.extend.size()) {
            LOGE("[CloudSyncer] Inconsistent size of inserted data.");
            return -E_INTERNAL_ERROR;
        }
        ret = GetWaterMarkAndUpdateTime(uploadData.insData.extend, waterMark);
        if (ret != E_OK) {
            return ret;
        }
    }

    if (!uploadData.updData.extend.empty()) {
        if (uploadData.updData.record.size() != uploadData.updData.extend.size()) {
            LOGE("[CloudSyncer] Inconsistent size of updated data, %d.", -E_INTERNAL_ERROR);
            return -E_INTERNAL_ERROR;
        }
        ret = GetWaterMarkAndUpdateTime(uploadData.updData.extend, waterMark);
        if (ret != E_OK) {
            return ret;
        }
    }

    if (!uploadData.delData.extend.empty()) {
        if (uploadData.delData.record.size() != uploadData.delData.extend.size()) {
            LOGE("[CloudSyncer] Inconsistent size of deleted data, %d.", -E_INTERNAL_ERROR);
            return -E_INTERNAL_ERROR;
        }
        ret = GetWaterMarkAndUpdateTime(uploadData.delData.extend, waterMark);
        if (ret != E_OK) {
            return ret;
        }
    }
    return E_OK;
}

void CloudSyncer::ClearCloudSyncData(CloudSyncData &uploadData)
{
    std::vector<VBucket>().swap(uploadData.insData.record);
    std::vector<VBucket>().swap(uploadData.insData.extend);
    std::vector<int64_t>().swap(uploadData.insData.rowid);
    std::vector<VBucket>().swap(uploadData.updData.record);
    std::vector<VBucket>().swap(uploadData.updData.extend);
    std::vector<VBucket>().swap(uploadData.delData.record);
    std::vector<VBucket>().swap(uploadData.delData.extend);
}

int32_t CloudSyncer::GetCloudSyncTaskCount()
{
    std::lock_guard<std::mutex> autoLock(queueLock_);
    return taskQueue_.size();
}

int CloudSyncer::CleanCloudData(ClearMode mode, const std::vector<std::string> &tableNameList,
    const RelationalSchemaObject &localSchema)
{
    std::lock_guard<std::mutex> lock(syncMutex_);
    int index = 1;
    for (const auto &tableName: tableNameList) {
        LOGD("[CloudSyncer] Start clean cloud water mark. table index: %d.", index);
        int ret = storageProxy_->CleanWaterMark(tableName);
        if (ret != E_OK) {
        LOGE("[CloudSyncer] failed to put cloud water mark after clean cloud data, %d.", ret);
            return ret;
        }
        index++;
    }
    int errCode = storageProxy_->StartTransaction(TransactType::IMMEDIATE);
    if (errCode != E_OK) {
        LOGE("[CloudSyncer] failed to start Transaction before clean cloud data, %d", errCode);
        return errCode;
    }

    std::vector<Asset> assets;
    errCode = storageProxy_->CleanCloudData(mode, tableNameList, localSchema, assets);
    if (errCode != E_OK) {
        LOGE("[CloudSyncer] failed to clean cloud data, %d.", errCode);
        storageProxy_->Rollback();
        return errCode;
    }

    if (!assets.empty() && mode == FLAG_AND_DATA) {
        errCode = cloudDB_.RemoveLocalAssets(assets);
        if (errCode != E_OK) {
            LOGE("[Storage Executor] failed to remove local assets, %d.", errCode);
            storageProxy_->Rollback();
            return errCode;
        }
    }

    storageProxy_->Commit();
    return errCode;
}

void CloudSyncer::ModifyCloudDataTime(VBucket &data)
{
    // data already check field modify_field and create_field
    int64_t modifyTime = std::get<int64_t>(data[CloudDbConstant::MODIFY_FIELD]) * CloudDbConstant::TEN_THOUSAND;
    int64_t createTime = std::get<int64_t>(data[CloudDbConstant::CREATE_FIELD]) * CloudDbConstant::TEN_THOUSAND;
    data[CloudDbConstant::MODIFY_FIELD] = modifyTime;
    data[CloudDbConstant::CREATE_FIELD] = createTime;
}

void CloudSyncer::UpdateCloudWaterMark(const SyncParam &param)
{
    bool isUpdateCloudCursor = true;
    {
        std::lock_guard<std::mutex> autoLock(queueLock_);
        isUpdateCloudCursor = currentContext_.strategy->JudgeUpdateCursor();
    }
    // use the cursor of the last datum in data set to update cloud water mark
    if (isUpdateCloudCursor) {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        currentContext_.cloudWaterMarks[param.info.tableName] = param.cloudWaterMark;
    }
}

int CloudSyncer::CommitDownloadResult(InnerProcessInfo &info, DownloadCommitList &commitList)
{
    uint32_t successCount = 0;
    int ret = HandleDownloadResult(info.tableName, commitList, successCount);
    info.downLoadInfo.failCount += (commitList.size() - successCount);
    info.downLoadInfo.successCount -= (commitList.size() - successCount);
    if (ret != E_OK) {
        LOGE("Commit download result failed.%d", ret);
    }
    commitList.clear();
    return ret;
}

std::string CloudSyncer::GetIdentify() const
{
    return id_;
}

int CloudSyncer::TagStatusByStrategy(bool isExist, SyncParam &param, DataInfo &dataInfo, OpType &strategyOpResult)
{
    strategyOpResult = OpType::NOT_HANDLE;
    // ignore same record with local generate data
    if (dataInfo.localInfo.logInfo.device.empty() &&
        !NeedSaveData(dataInfo.localInfo.logInfo, dataInfo.cloudLogInfo)) {
        // not handle same data
        return E_OK;
    }
    {
        std::lock_guard<std::mutex> autoLock(contextLock_);
        if (!currentContext_.strategy) {
            LOGE("[CloudSyncer] strategy has not been set when tag status, %d.", -E_INTERNAL_ERROR);
            return -E_INTERNAL_ERROR;
        }
        strategyOpResult = currentContext_.strategy->TagSyncDataStatus(isExist, dataInfo.localInfo.logInfo,
            dataInfo.cloudLogInfo, param.deletePrimaryKeySet);
    }
    return E_OK;
}
} // namespace DistributedDB