// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you 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 "storage/task/engine_checksum_task.h"

#include <glog/logging.h>

#include <ostream>

#include <string>

#include <vector>

#include "core/block/block.h"

#include "exec/common/sip_hash.h"

#include "io/io_common.h"

#include "runtime/memory/mem_tracker_limiter.h"

#include "runtime/thread_context.h"

#include "storage/iterator/block_reader.h"

#include "storage/olap_common.h"

#include "storage/olap_define.h"

#include "storage/rowset/rowset.h"

#include "storage/storage_engine.h"

#include "storage/tablet/tablet.h"

#include "storage/tablet/tablet_manager.h"

#include "storage/tablet/tablet_reader.h"

#include "storage/utils.h"

namespace doris {

EngineChecksumTask::EngineChecksumTask(StorageEngine& engine, TTabletId tablet_id,

                                       TSchemaHash schema_hash, TVersion version,

                                       uint32_t* checksum)

        : _engine(engine),

          _tablet_id(tablet_id),

          _schema_hash(schema_hash),

          _version(version),

          _checksum(checksum) {

    _mem_tracker = MemTrackerLimiter::create_shared(

            MemTrackerLimiter::Type::LOAD,

            "EngineChecksumTask#tabletId=" + std::to_string(tablet_id));

}

EngineChecksumTask::~EngineChecksumTask() = default;

Status EngineChecksumTask::execute() {

    return _compute_checksum();

} // execute

Status EngineChecksumTask::_compute_checksum() {

    LOG(INFO) << "begin to process compute checksum."

              << "tablet_id=" << _tablet_id << ", schema_hash=" << _schema_hash

              << ", version=" << _version;

    OlapStopWatch watch;

    if (_checksum == nullptr) {

        return Status::InvalidArgument("invalid checksum which is nullptr");

    }

    TabletSharedPtr tablet = _engine.tablet_manager()->get_tablet(_tablet_id);

    if (nullptr == tablet) {

        return Status::InternalError("could not find tablet {}", _tablet_id);

    }

    std::vector<RowsetSharedPtr> input_rowsets;

    Version version(0, _version);

    BlockReader reader;

    TabletReader::ReaderParams reader_params;

    Block block;

    {

        std::shared_lock rdlock(tablet->get_header_lock());

        auto ret = tablet->capture_consistent_rowsets_unlocked(version, CaptureRowsetOps {});

        if (ret) {

            input_rowsets = std::move(ret->rowsets);

        } else {

            LOG(WARNING) << "fail to captute consistent rowsets. tablet=" << tablet->tablet_id()

                         << "res=" << ret.error();

            return std::move(ret.error());

        }

        RETURN_IF_ERROR(TabletReader::init_reader_params_and_create_block(

                tablet, ReaderType::READER_CHECKSUM, input_rowsets, &reader_params, &block));

    }

    size_t input_size = 0;

    for (const auto& rowset : input_rowsets) {

        input_size += rowset->total_disk_size();

    }

    auto res = reader.init(reader_params);

    if (!res.ok()) {

        LOG(WARNING) << "initiate reader fail. res = " << res;

        return res;

    }

    bool eof = false;

    SipHash block_hash;

    uint64_t rows = 0;

    while (!eof) {

        RETURN_IF_ERROR(reader.next_block_with_aggregation(&block, &eof));

        rows += block.rows();

        block.update_hash(block_hash);

        block.clear_column_data();

    }

    uint64_t checksum64 = block_hash.get64();

    *_checksum = (checksum64 >> 32) ^ (checksum64 & 0xffffffff);

    LOG(INFO) << "success to finish compute checksum. tablet_id = " << _tablet_id

              << ", rows = " << rows << ", checksum=" << *_checksum

              << ", total_size = " << input_size << ", cost(us): " << watch.get_elapse_time_us();

    return Status::OK();

}

} // namespace doris