// 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 "cloud/cloud_txn_delete_bitmap_cache.h"

#include <fmt/core.h>

#include <chrono>

#include <memory>

#include <shared_mutex>

#include "cloud/config.h"

#include "common/status.h"

#include "cpp/sync_point.h"

#include "storage/olap_common.h"

#include "storage/tablet/tablet_meta.h"

#include "storage/txn/txn_manager.h"

namespace doris {

CloudTxnDeleteBitmapCache::CloudTxnDeleteBitmapCache(size_t size_in_bytes)

        : LRUCachePolicy(CachePolicy::CacheType::CLOUD_TXN_DELETE_BITMAP_CACHE, size_in_bytes,

                         LRUCacheType::SIZE, /*stale_sweep_time_s*/ 86400, /*num_shards*/ 4,

                         /*element_count_capacity*/ 0, /*enable_prune*/ true,

                         /*is_lru_k*/ false),

          _stop_latch(1) {}

CloudTxnDeleteBitmapCache::~CloudTxnDeleteBitmapCache() {

    _stop_latch.count_down();

    _clean_thread->join();

}

Status CloudTxnDeleteBitmapCache::init() {

    auto st = Thread::create(

            "CloudTxnDeleteBitmapCache", "clean_txn_dbm_thread",

            [this]() { this->_clean_thread_callback(); }, &_clean_thread);

    if (!st.ok()) {

        LOG(WARNING) << "failed to create thread for CloudTxnDeleteBitmapCache, error: " << st;

    }

    return st;

}

Status CloudTxnDeleteBitmapCache::get_tablet_txn_info(

        TTransactionId transaction_id, int64_t tablet_id, RowsetSharedPtr* rowset,

        DeleteBitmapPtr* delete_bitmap, RowsetIdUnorderedSet* rowset_ids, int64_t* txn_expiration,

        std::shared_ptr<PartialUpdateInfo>* partial_update_info,

        std::shared_ptr<PublishStatus>* publish_status, TxnPublishInfo* previous_publish_info) {

    {

        std::shared_lock<std::shared_mutex> rlock(_rwlock);

        TxnKey key(transaction_id, tablet_id);

        DBUG_EXECUTE_IF("CloudTxnDeleteBitmapCache.get_tablet_txn_info.not_found", {

            return Status::Error<ErrorCode::NOT_FOUND>(

                    "not found txn info for test, tablet_id={}, transaction_id={}", tablet_id,

                    transaction_id);

        });

        auto iter = _txn_map.find(key);

        if (iter == _txn_map.end()) {

            return Status::Error<ErrorCode::NOT_FOUND, false>(

                    "not found txn info, tablet_id={}, transaction_id={}", tablet_id,

                    transaction_id);

        }

        *rowset = iter->second.rowset;

        *txn_expiration = iter->second.txn_expiration;

        *partial_update_info = iter->second.partial_update_info;

        *publish_status = iter->second.publish_status;

        *previous_publish_info = iter->second.publish_info;

    }

    auto st = get_delete_bitmap(transaction_id, tablet_id, delete_bitmap, rowset_ids, nullptr);

    if (st.is<ErrorCode::NOT_FOUND>()) {

        // Because of the rowset_ids become empty, all delete bitmap

        // will be recalculate in CalcDeleteBitmapTask

        if (delete_bitmap != nullptr) {

            *delete_bitmap = std::make_shared<DeleteBitmap>(tablet_id);

        }

        // to avoid to skip calculating

        **publish_status = PublishStatus::INIT;

        return Status::OK();

    }

    return st;

}

Status CloudTxnDeleteBitmapCache::get_delete_bitmap(

        TTransactionId transaction_id, int64_t tablet_id, DeleteBitmapPtr* delete_bitmap,

        RowsetIdUnorderedSet* rowset_ids, std::shared_ptr<PublishStatus>* publish_status) {

    if (publish_status) {

        std::shared_lock<std::shared_mutex> rlock(_rwlock);

        TxnKey txn_key(transaction_id, tablet_id);

        auto iter = _txn_map.find(txn_key);

        if (iter == _txn_map.end()) {

            return Status::Error<ErrorCode::NOT_FOUND, false>(

                    "not found txn info, tablet_id={}, transaction_id={}", tablet_id,

                    transaction_id);

        }

        *publish_status = iter->second.publish_status;

    }

    std::string key_str = fmt::format("{}/{}", transaction_id, tablet_id);

    CacheKey key(key_str);

    Cache::Handle* handle = lookup(key);

    DBUG_EXECUTE_IF("CloudTxnDeleteBitmapCache::get_delete_bitmap.cache_miss", {

        handle = nullptr;

        LOG(INFO) << "CloudTxnDeleteBitmapCache::get_delete_bitmap.cache_miss, make cache missed "

                     "when get delete bitmap, txn_id:"

                  << transaction_id << ", tablet_id: " << tablet_id;

    });

    DeleteBitmapCacheValue* val =

            handle == nullptr ? nullptr : reinterpret_cast<DeleteBitmapCacheValue*>(value(handle));

    if (val) {

        *delete_bitmap = val->delete_bitmap;

        if (rowset_ids) {

            *rowset_ids = val->rowset_ids;

        }

        // must call release handle to reduce the reference count,

        // otherwise there will be memory leak

        release(handle);

    } else {

        LOG_INFO("cache missed when get delete bitmap")

                .tag("txn_id", transaction_id)

                .tag("tablet_id", tablet_id);

        return Status::Error<ErrorCode::NOT_FOUND, false>(

                "cache missed when get delete bitmap, tablet_id={}, transaction_id={}", tablet_id,

                transaction_id);

    }

    return Status::OK();

}

void CloudTxnDeleteBitmapCache::set_tablet_txn_info(

        TTransactionId transaction_id, int64_t tablet_id, DeleteBitmapPtr delete_bitmap,

        const RowsetIdUnorderedSet& rowset_ids, RowsetSharedPtr rowset, int64_t txn_expiration,

        std::shared_ptr<PartialUpdateInfo> partial_update_info) {

    int64_t txn_expiration_min =

            duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch())

                    .count() +

            config::tablet_txn_info_min_expired_seconds;

    txn_expiration = std::max(txn_expiration_min, txn_expiration);

    {

        std::unique_lock<std::shared_mutex> wlock(_rwlock);

        TxnKey txn_key(transaction_id, tablet_id);

        std::shared_ptr<PublishStatus> publish_status =

                std::make_shared<PublishStatus>(PublishStatus::INIT);

        _txn_map[txn_key] = TxnVal(rowset, txn_expiration, std::move(partial_update_info),

                                   std::move(publish_status));

        _expiration_txn.emplace(txn_expiration, txn_key);

    }

    std::string key_str = fmt::format("{}/{}", transaction_id, tablet_id);

    CacheKey key(key_str);

    auto val = new DeleteBitmapCacheValue(delete_bitmap, rowset_ids);

    size_t charge = sizeof(DeleteBitmapCacheValue);

    for (auto& [k, v] : val->delete_bitmap->delete_bitmap) {

        charge += v.getSizeInBytes();

    }

    auto* handle = insert(key, val, charge, charge, CachePriority::NORMAL);

    // must call release handle to reduce the reference count,

    // otherwise there will be memory leak

    release(handle);

    LOG_INFO("set txn related delete bitmap")

            .tag("txn_id", transaction_id)

            .tag("expiration", txn_expiration)

            .tag("tablet_id", tablet_id)

            .tag("delete_bitmap_size", charge)

            .tag("delete_bitmap_count", delete_bitmap->get_delete_bitmap_count())

            .tag("delete_bitmap_cardinality", delete_bitmap->cardinality());

}

Status CloudTxnDeleteBitmapCache::update_tablet_txn_info(TTransactionId transaction_id,

                                                         int64_t tablet_id,

                                                         DeleteBitmapPtr delete_bitmap,

                                                         const RowsetIdUnorderedSet& rowset_ids,

                                                         PublishStatus publish_status,

                                                         TxnPublishInfo publish_info) {

    {

        std::unique_lock<std::shared_mutex> wlock(_rwlock);

        TxnKey txn_key(transaction_id, tablet_id);

        if (!_txn_map.contains(txn_key)) {

            return Status::Error<ErrorCode::NOT_FOUND, false>(

                    "not found txn info, tablet_id={}, transaction_id={}, may be expired and be "

                    "removed",

                    tablet_id, transaction_id);

        }

        TxnVal& txn_val = _txn_map[txn_key];

        *(txn_val.publish_status) = publish_status;

        if (publish_status == PublishStatus::SUCCEED) {

            txn_val.publish_info = publish_info;

        }

    }

    std::string key_str = fmt::format("{}/{}", transaction_id, tablet_id);

    CacheKey key(key_str);

    auto val = new DeleteBitmapCacheValue(delete_bitmap, rowset_ids);

    size_t charge = sizeof(DeleteBitmapCacheValue);

    for (auto& [k, v] : val->delete_bitmap->delete_bitmap) {

        charge += v.getSizeInBytes();

    }

    auto* handle = insert(key, val, charge, charge, CachePriority::NORMAL);

    // must call release handle to reduce the reference count,

    // otherwise there will be memory leak

    release(handle);

    if (config::enable_mow_verbose_log) {

        LOG_INFO("update txn related delete bitmap")

                .tag("txn_id", transaction_id)

                .tag("tablt_id", tablet_id)

                .tag("delete_bitmap_size", charge)

                .tag("delete_bitmap_count", delete_bitmap->get_delete_bitmap_count())

                .tag("delete_bitmap_cardinality", delete_bitmap->cardinality())

                .tag("publish_status", static_cast<int>(publish_status));

    }

    return Status::OK();

}

void CloudTxnDeleteBitmapCache::remove_expired_tablet_txn_info() {

    TEST_SYNC_POINT_RETURN_WITH_VOID("CloudTxnDeleteBitmapCache::remove_expired_tablet_txn_info");

    std::unique_lock<std::shared_mutex> wlock(_rwlock);

    while (!_expiration_txn.empty()) {

        auto iter = _expiration_txn.begin();

        bool in_txn_map = _txn_map.find(iter->second) != _txn_map.end();

        bool in_markers = _empty_rowset_markers.find(iter->second) != _empty_rowset_markers.end();

        if (!in_txn_map && !in_markers) {

            _expiration_txn.erase(iter);

            continue;

        }

        int64_t current_time = duration_cast<std::chrono::seconds>(

                                       std::chrono::system_clock::now().time_since_epoch())

                                       .count();

        if (iter->first > current_time) {

            break;

        }

        // Clean from _txn_map if exists

        auto txn_iter = _txn_map.find(iter->second);

        if ((txn_iter != _txn_map.end()) && (iter->first == txn_iter->second.txn_expiration)) {

            LOG_INFO("clean expired delete bitmap")

                    .tag("txn_id", txn_iter->first.txn_id)

                    .tag("expiration", txn_iter->second.txn_expiration)

                    .tag("tablt_id", txn_iter->first.tablet_id);

            std::string key_str = std::to_string(txn_iter->first.txn_id) + "/" +

                                  std::to_string(txn_iter->first.tablet_id); // Cache key container

            CacheKey cache_key(key_str);

            erase(cache_key);

            _txn_map.erase(iter->second);

        }

        // Clean from _empty_rowset_markers if exists

        auto marker_iter = _empty_rowset_markers.find(iter->second);

        if (marker_iter != _empty_rowset_markers.end()) {

            LOG_INFO("clean expired empty rowset marker")

                    .tag("txn_id", iter->second.txn_id)

                    .tag("tablet_id", iter->second.tablet_id);

            _empty_rowset_markers.erase(marker_iter);

        }

        _expiration_txn.erase(iter);

    }

}

void CloudTxnDeleteBitmapCache::remove_unused_tablet_txn_info(TTransactionId transaction_id,

                                                              int64_t tablet_id) {

    std::unique_lock<std::shared_mutex> wlock(_rwlock);

    TxnKey txn_key(transaction_id, tablet_id);

    auto txn_iter = _txn_map.find(txn_key);

    if (txn_iter != _txn_map.end()) {

        LOG_INFO("remove unused tablet txn info")

                .tag("txn_id", txn_iter->first.txn_id)

                .tag("tablt_id", txn_iter->first.tablet_id);

        std::string key_str = std::to_string(txn_iter->first.txn_id) + "/" +

                              std::to_string(txn_iter->first.tablet_id); // Cache key container

        CacheKey cache_key(key_str);

        erase(cache_key);

        _txn_map.erase(txn_key);

    }

}

void CloudTxnDeleteBitmapCache::mark_empty_rowset(TTransactionId txn_id, int64_t tablet_id,

                                                  int64_t txn_expiration) {

    int64_t txn_expiration_min =

            duration_cast<std::chrono::seconds>(std::chrono::system_clock::now().time_since_epoch())

                    .count() +

            config::tablet_txn_info_min_expired_seconds;

    txn_expiration = std::max(txn_expiration_min, txn_expiration);

    if (config::enable_mow_verbose_log) {

        LOG_INFO("mark empty rowset")

                .tag("txn_id", txn_id)

                .tag("tablet_id", tablet_id)

                .tag("expiration", txn_expiration);

    }

    std::unique_lock<std::shared_mutex> wlock(_rwlock);

    TxnKey txn_key(txn_id, tablet_id);

    _empty_rowset_markers.emplace(txn_key);

    _expiration_txn.emplace(txn_expiration, txn_key);

}

bool CloudTxnDeleteBitmapCache::is_empty_rowset(TTransactionId txn_id, int64_t tablet_id) {

    std::shared_lock<std::shared_mutex> rlock(_rwlock);

    TxnKey txn_key(txn_id, tablet_id);

    return _empty_rowset_markers.contains(txn_key);

}

void CloudTxnDeleteBitmapCache::_clean_thread_callback() {

    do {

        remove_expired_tablet_txn_info();

    } while (!_stop_latch.wait_for(

            std::chrono::seconds(config::remove_expired_tablet_txn_info_interval_seconds)));

}

} // namespace doris