// 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 "runtime/load_channel.h"

#include <gen_cpp/internal_service.pb.h>

#include <glog/logging.h>

#include "bvar/bvar.h"

#include "olap/storage_engine.h"

#include "runtime/exec_env.h"

#include "runtime/fragment_mgr.h"

#include "runtime/memory/mem_tracker.h"

#include "runtime/tablets_channel.h"

#include "runtime/thread_context.h"

#include "runtime/workload_group/workload_group_manager.h"

namespace doris {

bvar::Adder<int64_t> g_loadchannel_cnt("loadchannel_cnt");

LoadChannel::LoadChannel(const UniqueId& load_id, int64_t timeout_s, bool is_high_priority,

                         std::string sender_ip, int64_t backend_id, bool enable_profile)

        : _load_id(load_id),

          _timeout_s(timeout_s),

          _is_high_priority(is_high_priority),

          _sender_ip(std::move(sender_ip)),

          _backend_id(backend_id),

          _enable_profile(enable_profile) {

    std::shared_ptr<QueryContext> query_context =

            ExecEnv::GetInstance()->fragment_mgr()->get_query_context(_load_id.to_thrift());

    if (query_context != nullptr) {

        _query_thread_context = {_load_id.to_thrift(), query_context->query_mem_tracker,

                                 query_context->workload_group()};

    } else {

        _query_thread_context = {

                _load_id.to_thrift(),

                MemTrackerLimiter::create_shared(

                        MemTrackerLimiter::Type::LOAD,

                        fmt::format("(FromLoadChannel)Load#Id={}", _load_id.to_string()))};

    }

    g_loadchannel_cnt << 1;

    // _last_updated_time should be set before being inserted to

    // _load_channels in load_channel_mgr, or it may be erased

    // immediately by gc thread.

    _last_updated_time.store(time(nullptr));

    _init_profile();

}

LoadChannel::~LoadChannel() {

    g_loadchannel_cnt << -1;

    std::stringstream rows_str;

    for (const auto& entry : _tablets_channels_rows) {

        rows_str << ", index id: " << entry.first << ", total_received_rows: " << entry.second.first

                 << ", num_rows_filtered: " << entry.second.second;

    }

    LOG(INFO) << "load channel removed"

              << " load_id=" << _load_id << ", is high priority=" << _is_high_priority

              << ", sender_ip=" << _sender_ip << rows_str.str();

}

void LoadChannel::_init_profile() {

    _profile = std::make_unique<RuntimeProfile>("LoadChannels");

    _mgr_add_batch_timer = ADD_TIMER(_profile, "LoadChannelMgrAddBatchTime");

    _handle_mem_limit_timer = ADD_TIMER(_profile, "HandleMemLimitTime");

    _self_profile =

            _profile->create_child(fmt::format("LoadChannel load_id={} (host={}, backend_id={})",

                                               _load_id.to_string(), _sender_ip, _backend_id),

                                   true, true);

    _add_batch_number_counter = ADD_COUNTER(_self_profile, "NumberBatchAdded", TUnit::UNIT);

    _peak_memory_usage_counter = ADD_COUNTER(_self_profile, "PeakMemoryUsage", TUnit::BYTES);

    _add_batch_timer = ADD_TIMER(_self_profile, "AddBatchTime");

    _handle_eos_timer = ADD_CHILD_TIMER(_self_profile, "HandleEosTime", "AddBatchTime");

    _add_batch_times = ADD_COUNTER(_self_profile, "AddBatchTimes", TUnit::UNIT);

}

Status LoadChannel::open(const PTabletWriterOpenRequest& params) {

    SCOPED_ATTACH_TASK(_query_thread_context);

    int64_t index_id = params.index_id();

    std::shared_ptr<BaseTabletsChannel> channel;

    {

        std::lock_guard<std::mutex> l(_lock);

        auto it = _tablets_channels.find(index_id);

        if (it != _tablets_channels.end()) {

            channel = it->second;

        } else {

            // just for VLOG

            if (_txn_id == 0) [[unlikely]] {

                _txn_id = params.txn_id();

            }

            // create a new tablets channel

            TabletsChannelKey key(params.id(), index_id);

            // TODO(plat1ko): CloudTabletsChannel

            channel = std::make_shared<TabletsChannel>(*StorageEngine::instance(), key, _load_id,

                                                       _is_high_priority, _self_profile);

            {

                std::lock_guard<std::mutex> l(_tablets_channels_lock);

                _tablets_channels.insert({index_id, channel});

            }

        }

    }

    if (params.is_incremental()) {

        // incremental open would ensure not to open tablet repeatedly

        RETURN_IF_ERROR(channel->incremental_open(params));

    } else {

        RETURN_IF_ERROR(channel->open(params));

    }

    _opened = true;

    _last_updated_time.store(time(nullptr));

    return Status::OK();

}

Status LoadChannel::_get_tablets_channel(std::shared_ptr<BaseTabletsChannel>& channel,

                                         bool& is_finished, const int64_t index_id) {

    std::lock_guard<std::mutex> l(_lock);

    auto it = _tablets_channels.find(index_id);

    if (it == _tablets_channels.end()) {

        if (_finished_channel_ids.find(index_id) != _finished_channel_ids.end()) {

            // this channel is already finished, just return OK

            is_finished = true;

            return Status::OK();

        }

        std::stringstream ss;

        ss << "load channel " << _load_id << " add batch with unknown index id: " << index_id;

        return Status::InternalError(ss.str());

    }

    is_finished = false;

    channel = it->second;

    return Status::OK();

}

Status LoadChannel::add_batch(const PTabletWriterAddBlockRequest& request,

                              PTabletWriterAddBlockResult* response) {

    SCOPED_TIMER(_add_batch_timer);

    COUNTER_UPDATE(_add_batch_times, 1);

    SCOPED_ATTACH_TASK(_query_thread_context);

    int64_t index_id = request.index_id();

    // 1. get tablets channel

    std::shared_ptr<BaseTabletsChannel> channel;

    bool is_finished = false;

    Status st = _get_tablets_channel(channel, is_finished, index_id);

    if (!st.ok() || is_finished) {

        return st;

    }

    // 2. add block to tablets channel

    if (request.has_block()) {

        RETURN_IF_ERROR(channel->add_batch(request, response));

        _add_batch_number_counter->update(1);

    }

    // 3. handle eos

    // if channel is incremental, maybe hang on close until all close request arrived.

    if (request.has_eos() && request.eos()) {

        st = _handle_eos(channel.get(), request, response);

        _report_profile(response);

        if (!st.ok()) {

            return st;

        }

    } else if (_add_batch_number_counter->value() % 100 == 1) {

        _report_profile(response);

    }

    _last_updated_time.store(time(nullptr));

    return st;

}

Status LoadChannel::_handle_eos(BaseTabletsChannel* channel,

                                const PTabletWriterAddBlockRequest& request,

                                PTabletWriterAddBlockResult* response) {

    _self_profile->add_info_string("EosHost", fmt::format("{}", request.backend_id()));

    bool finished = false;

    auto index_id = request.index_id();

    RETURN_IF_ERROR(channel->close(this, request, response, &finished));

    // for init node, we close waiting(hang on) all close request and let them return together.

    if (request.has_hang_wait() && request.hang_wait()) {

        DCHECK(!channel->is_incremental_channel());

        VLOG_DEBUG << fmt::format("txn {}: reciever index {} close waiting by sender {}", _txn_id,

                                  request.index_id(), request.sender_id());

        int count = 0;

        while (!channel->is_finished()) {

            bthread_usleep(1000);

            count++;

        }

        // now maybe finished or cancelled.

        VLOG_TRACE << "reciever close wait finished!" << request.sender_id();

        if (count >= 1000 * _timeout_s) { // maybe config::streaming_load_rpc_max_alive_time_sec

            return Status::InternalError("Tablets channel didn't wait all close");

        }

    }

    if (finished) {

        std::lock_guard<std::mutex> l(_lock);

        {

            std::lock_guard<std::mutex> l(_tablets_channels_lock);

            _tablets_channels_rows.insert(std::make_pair(

                    index_id,

                    std::make_pair(channel->total_received_rows(), channel->num_rows_filtered())));

            _tablets_channels.erase(index_id);

        }

        LOG(INFO) << "txn " << _txn_id << " closed tablets_channel " << index_id;

        _finished_channel_ids.emplace(index_id);

    }

    return Status::OK();

}

void LoadChannel::_report_profile(PTabletWriterAddBlockResult* response) {

    if (!_enable_profile) {

        return;

    }

    // TabletSink and LoadChannel in BE are M: N relationship,

    // Every once in a while LoadChannel will randomly return its own runtime profile to a TabletSink,

    // so usually all LoadChannel runtime profiles are saved on each TabletSink,

    // and the timeliness of the same LoadChannel profile saved on different TabletSinks is different,

    // and each TabletSink will periodically send fe reports all the LoadChannel profiles saved by itself,

    // and ensures to update the latest LoadChannel profile according to the timestamp.

    _self_profile->set_timestamp(_last_updated_time);

    {

        std::lock_guard<std::mutex> l(_tablets_channels_lock);

        for (auto& it : _tablets_channels) {

            it.second->refresh_profile();

        }

    }

    TRuntimeProfileTree tprofile;

    ThriftSerializer ser(false, 4096);

    uint8_t* buf = nullptr;

    uint32_t len = 0;

    std::lock_guard<SpinLock> l(_profile_serialize_lock);

    _profile->to_thrift(&tprofile);

    auto st = ser.serialize(&tprofile, &len, &buf);

    if (st.ok()) {

        response->set_load_channel_profile(std::string((const char*)buf, len));

    } else {

        LOG(WARNING) << "load channel TRuntimeProfileTree serialize failed, errmsg=" << st;

    }

}

bool LoadChannel::is_finished() {

    if (!_opened) {

        return false;

    }

    std::lock_guard<std::mutex> l(_lock);

    return _tablets_channels.empty();

}

Status LoadChannel::cancel() {

    std::lock_guard<std::mutex> l(_lock);

    for (auto& it : _tablets_channels) {

        static_cast<void>(it.second->cancel());

    }

    return Status::OK();

}

} // namespace doris