// 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 "service/http/action/http_stream.h"

#include <cstddef>

#include <future>

#include <sstream>

// use string iequal

#include <event2/buffer.h>

#include <event2/bufferevent.h>

#include <event2/http.h>

#include <gen_cpp/FrontendService.h>

#include <gen_cpp/FrontendService_types.h>

#include <gen_cpp/HeartbeatService_types.h>

#include <rapidjson/prettywriter.h>

#include <thrift/protocol/TDebugProtocol.h>

#include "cloud/config.h"

#include "common/config.h"

#include "common/logging.h"

#include "common/metrics/doris_metrics.h"

#include "common/metrics/metrics.h"

#include "common/status.h"

#include "common/utils.h"

#include "io/fs/stream_load_pipe.h"

#include "load/group_commit/group_commit_mgr.h"

#include "load/load_path_mgr.h"

#include "load/stream_load/new_load_stream_mgr.h"

#include "load/stream_load/stream_load_context.h"

#include "load/stream_load/stream_load_executor.h"

#include "load/stream_load/stream_load_recorder.h"

#include "runtime/exec_env.h"

#include "runtime/fragment_mgr.h"

#include "service/http/http_channel.h"

#include "service/http/http_common.h"

#include "service/http/http_headers.h"

#include "service/http/http_request.h"

#include "service/http/utils.h"

#include "storage/storage_engine.h"

#include "util/byte_buffer.h"

#include "util/client_cache.h"

#include "util/string_util.h"

#include "util/thrift_rpc_helper.h"

#include "util/time.h"

#include "util/uid_util.h"

namespace doris {

using namespace ErrorCode;

DEFINE_COUNTER_METRIC_PROTOTYPE_2ARG(http_stream_requests_total, MetricUnit::REQUESTS);

DEFINE_COUNTER_METRIC_PROTOTYPE_2ARG(http_stream_duration_ms, MetricUnit::MILLISECONDS);

DEFINE_GAUGE_METRIC_PROTOTYPE_2ARG(http_stream_current_processing, MetricUnit::REQUESTS);

HttpStreamAction::HttpStreamAction(ExecEnv* exec_env)

        : HttpHandlerWithAuth(exec_env, TPrivilegeHier::GLOBAL, TPrivilegeType::LOAD) {

    // Use LOAD privilege type: requires LOAD permission

    // Note: _exec_env is set by parent class HttpHandlerWithAuth

    _http_stream_entity =

            DorisMetrics::instance()->metric_registry()->register_entity("http_stream");

    INT_COUNTER_METRIC_REGISTER(_http_stream_entity, http_stream_requests_total);

    INT_COUNTER_METRIC_REGISTER(_http_stream_entity, http_stream_duration_ms);

    INT_GAUGE_METRIC_REGISTER(_http_stream_entity, http_stream_current_processing);

}

HttpStreamAction::~HttpStreamAction() {

    DorisMetrics::instance()->metric_registry()->deregister_entity(_http_stream_entity);

}

void HttpStreamAction::handle(HttpRequest* req) {

    std::shared_ptr<StreamLoadContext> ctx =

            std::static_pointer_cast<StreamLoadContext>(req->handler_ctx());

    if (ctx == nullptr) {

        return;

    }

    // status already set to fail

    if (ctx->status.ok()) {

        ctx->status = _handle(req, ctx);

        if (!ctx->status.ok() && !ctx->status.is<PUBLISH_TIMEOUT>()) {

            LOG(WARNING) << "handle streaming load failed, id=" << ctx->id

                         << ", errmsg=" << ctx->status;

        }

    }

    ctx->load_cost_millis = UnixMillis() - ctx->start_millis;

    if (!ctx->status.ok() && !ctx->status.is<PUBLISH_TIMEOUT>()) {

        if (ctx->body_sink != nullptr) {

            ctx->body_sink->cancel(ctx->status.to_string());

        }

    }

    if (!ctx->status.ok()) {

        auto str = std::string(ctx->to_json());

        // add new line at end

        str = str + '\n';

        HttpChannel::send_reply(req, str);

        return;

    }

    auto str = std::string(ctx->to_json());

    // add new line at end

    str = str + '\n';

    HttpChannel::send_reply(req, str);

    if (config::enable_stream_load_record || config::enable_stream_load_record_to_audit_log_table) {

        if (req->header(HTTP_SKIP_RECORD_TO_AUDIT_LOG_TABLE).empty()) {

            str = ctx->prepare_stream_load_record(str);

            _save_stream_load_record(ctx, str);

        }

    }

    // update statistics

    http_stream_requests_total->increment(1);

    http_stream_duration_ms->increment(ctx->load_cost_millis);

}

Status HttpStreamAction::_handle(HttpRequest* http_req, std::shared_ptr<StreamLoadContext> ctx) {

    if (ctx->body_bytes > 0 && ctx->receive_bytes != ctx->body_bytes) {

        LOG(WARNING) << "recevie body don't equal with body bytes, body_bytes=" << ctx->body_bytes

                     << ", receive_bytes=" << ctx->receive_bytes << ", id=" << ctx->id;

        return Status::Error<ErrorCode::NETWORK_ERROR>("receive body don't equal with body bytes");

    }

    RETURN_IF_ERROR(ctx->body_sink->finish());

    // wait stream load finish

    RETURN_IF_ERROR(ctx->load_status_future.get());

    if (ctx->group_commit) {

        LOG(INFO) << "skip commit because this is group commit, pipe_id=" << ctx->id.to_string();

        return Status::OK();

    }

    if (ctx->two_phase_commit) {

        int64_t pre_commit_start_time = MonotonicNanos();

        RETURN_IF_ERROR(_exec_env->stream_load_executor()->pre_commit_txn(ctx.get()));

        ctx->pre_commit_txn_cost_nanos = MonotonicNanos() - pre_commit_start_time;

    } else {

        // If put file success we need commit this load

        int64_t commit_and_publish_start_time = MonotonicNanos();

        RETURN_IF_ERROR(_exec_env->stream_load_executor()->commit_txn(ctx.get()));

        ctx->commit_and_publish_txn_cost_nanos = MonotonicNanos() - commit_and_publish_start_time;

    }

    return Status::OK();

}

int HttpStreamAction::on_header(HttpRequest* req) {

    // Call parent's auth check first

    int ret = HttpHandlerWithAuth::on_header(req);

    if (ret != 0) {

        return ret; // Auth failed, return error

    }

    http_stream_current_processing->increment(1);

    std::shared_ptr<StreamLoadContext> ctx = std::make_shared<StreamLoadContext>(_exec_env);

    req->set_handler_ctx(ctx);

    ctx->load_type = TLoadType::MANUL_LOAD;

    ctx->load_src_type = TLoadSourceType::RAW;

    ctx->two_phase_commit = req->header(HTTP_TWO_PHASE_COMMIT) == "true";

    Status st = _handle_group_commit(req, ctx);

    LOG(INFO) << "new income streaming load request." << ctx->brief()

              << " sql : " << req->header(HTTP_SQL) << ", group_commit=" << ctx->group_commit;

    if (st.ok()) {

        st = _on_header(req, ctx);

    }

    if (!st.ok()) {

        ctx->status = std::move(st);

        if (ctx->body_sink != nullptr) {

            ctx->body_sink->cancel(ctx->status.to_string());

        }

        auto str = ctx->to_json();

        // add new line at end

        str = str + '\n';

        HttpChannel::send_reply(req, str);

        if (config::enable_stream_load_record ||

            config::enable_stream_load_record_to_audit_log_table) {

            if (req->header(HTTP_SKIP_RECORD_TO_AUDIT_LOG_TABLE).empty()) {

                str = ctx->prepare_stream_load_record(str);

                _save_stream_load_record(ctx, str);

            }

        }

        return -1;

    }

    return 0;

}

Status HttpStreamAction::_on_header(HttpRequest* http_req, std::shared_ptr<StreamLoadContext> ctx) {

    // auth information

    if (!parse_basic_auth(*http_req, &ctx->auth)) {

        LOG(WARNING) << "parse basic authorization failed." << ctx->brief();

        return Status::NotAuthorized("no valid Basic authorization");

    }

    // TODO(zs) : need Need to request an FE to obtain information such as format

    // check content length

    ctx->body_bytes = 0;

    size_t csv_max_body_bytes = config::streaming_load_max_mb * 1024 * 1024;

    if (!http_req->header(HttpHeaders::CONTENT_LENGTH).empty()) {

        try {

            ctx->body_bytes = std::stol(http_req->header(HttpHeaders::CONTENT_LENGTH));

        } catch (const std::exception& e) {

            return Status::InvalidArgument("invalid HTTP header CONTENT_LENGTH={}: {}",

                                           http_req->header(HttpHeaders::CONTENT_LENGTH), e.what());

        }

        // csv max body size

        if (ctx->body_bytes > csv_max_body_bytes) {

            LOG(WARNING) << "body exceed max size." << ctx->brief();

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

                    "body size {} exceed BE's conf `streaming_load_max_mb` {}. increase it if you "

                    "are sure this load is reasonable",

                    ctx->body_bytes, csv_max_body_bytes);

        }

    }

    auto pipe = std::make_shared<io::StreamLoadPipe>(

            io::kMaxPipeBufferedBytes /* max_buffered_bytes */, 64 * 1024 /* min_chunk_size */,

            ctx->body_bytes /* total_length */);

    ctx->body_sink = pipe;

    ctx->pipe = pipe;

    RETURN_IF_ERROR(_exec_env->new_load_stream_mgr()->put(ctx->id, ctx));

    // Here, transactions are set from fe's NativeInsertStmt.

    // TODO(zs) : How to support two_phase_commit

    return Status::OK();

}

void HttpStreamAction::on_chunk_data(HttpRequest* req) {

    std::shared_ptr<StreamLoadContext> ctx =

            std::static_pointer_cast<StreamLoadContext>(req->handler_ctx());

    if (ctx == nullptr || !ctx->status.ok()) {

        return;

    }

    if (!req->header(HTTP_WAL_ID_KY).empty()) {

        ctx->wal_id = std::stoll(req->header(HTTP_WAL_ID_KY));

    }

    struct evhttp_request* ev_req = req->get_evhttp_request();

    auto evbuf = evhttp_request_get_input_buffer(ev_req);

    // In HttpStreamAction::on_chunk_data

    //      -> process_put

    //      -> StreamLoadExecutor::execute_plan_fragment

    //      -> exec_plan_fragment

    // , SCOPED_ATTACH_TASK will be called.

    SCOPED_SWITCH_THREAD_MEM_TRACKER_LIMITER(ExecEnv::GetInstance()->stream_load_pipe_tracker());

    int64_t start_read_data_time = MonotonicNanos();

    Status st = ctx->allocate_schema_buffer();

    if (!st.ok()) {

        ctx->status = st;

        return;

    }

    while (evbuffer_get_length(evbuf) > 0) {

        ByteBufferPtr bb;

        st = ByteBuffer::allocate(128 * 1024, &bb);

        if (!st.ok()) {

            ctx->status = st;

            return;

        }

        auto remove_bytes = evbuffer_remove(evbuf, bb->ptr, bb->capacity);

        bb->pos = remove_bytes;

        bb->flip();

        st = ctx->body_sink->append(bb);

        // schema_buffer stores 1M of data for parsing column information

        // need to determine whether to cache for the first time

        if (ctx->is_read_schema) {

            if (ctx->schema_buffer()->pos + remove_bytes < config::stream_tvf_buffer_size) {

                ctx->schema_buffer()->put_bytes(bb->ptr, remove_bytes);

            } else {

                LOG(INFO) << "use a portion of data to request fe to obtain column information";

                ctx->is_read_schema = false;

                ctx->status = process_put(req, ctx);

            }

        }

        if (!st.ok()) {

            LOG(WARNING) << "append body content failed. errmsg=" << st << ", " << ctx->brief();

            ctx->status = st;

            return;

        }

        ctx->receive_bytes += remove_bytes;

    }

    // after all the data has been read and it has not reached 1M, it will execute here

    if (ctx->is_read_schema) {

        LOG(INFO) << "after all the data has been read and it has not reached 1M, it will execute "

                  << "here";

        ctx->is_read_schema = false;

        ctx->status = process_put(req, ctx);

    }

    ctx->read_data_cost_nanos += (MonotonicNanos() - start_read_data_time);

}

void HttpStreamAction::free_handler_ctx(std::shared_ptr<void> param) {

    std::shared_ptr<StreamLoadContext> ctx = std::static_pointer_cast<StreamLoadContext>(param);

    if (ctx == nullptr) {

        return;

    }

    // sender is gone, make receiver know it

    if (ctx->body_sink != nullptr) {

        ctx->body_sink->cancel("sender is gone");

    }

    // remove stream load context from stream load manager and the resource will be released

    ctx->exec_env()->new_load_stream_mgr()->remove(ctx->id);

    http_stream_current_processing->increment(-1);

}

Status HttpStreamAction::process_put(HttpRequest* http_req,

                                     std::shared_ptr<StreamLoadContext> ctx) {

    TStreamLoadPutRequest request;

    if (http_req != nullptr) {

        request.__set_load_sql(http_req->header(HTTP_SQL));

        if (!http_req->header(HTTP_MEMTABLE_ON_SINKNODE).empty()) {

            bool value = iequal(http_req->header(HTTP_MEMTABLE_ON_SINKNODE), "true");

            request.__set_memtable_on_sink_node(value);

        }

    } else {

        request.__set_token(ctx->auth.token);

        request.__set_load_sql(ctx->sql_str);

        ctx->auth.token = "";

    }

    set_request_auth(&request, ctx->auth);

    request.__set_loadId(ctx->id.to_thrift());

    request.__set_label(ctx->label);

    if (ctx->group_commit) {

        if (!http_req->header(HTTP_GROUP_COMMIT).empty()) {

            request.__set_group_commit_mode(http_req->header(HTTP_GROUP_COMMIT));

        } else {

            // used for wait_internal_group_commit_finish

            request.__set_group_commit_mode("sync_mode");

        }

    }

    if (_exec_env->cluster_info()->backend_id != 0) {

        request.__set_backend_id(_exec_env->cluster_info()->backend_id);

    } else {

        LOG(WARNING) << "_exec_env->cluster_info not set backend_id";

    }

    if (ctx->wal_id > 0) {

        request.__set_partial_update(false);

    }

    // plan this load

    TNetworkAddress master_addr = _exec_env->cluster_info()->master_fe_addr;

    int64_t stream_load_put_start_time = MonotonicNanos();

    RETURN_IF_ERROR(ThriftRpcHelper::rpc<FrontendServiceClient>(

            master_addr.hostname, master_addr.port,

            [&request, ctx](FrontendServiceConnection& client) {

                client->streamLoadPut(ctx->put_result, request);

            }));

    ctx->put_result.pipeline_params.query_options.__set_enable_strict_cast(false);

    ctx->stream_load_put_cost_nanos = MonotonicNanos() - stream_load_put_start_time;

    Status plan_status(Status::create(ctx->put_result.status));

    if (!plan_status.ok()) {

        LOG(WARNING) << "plan streaming load failed. errmsg=" << plan_status << ctx->brief();

        return plan_status;

    }

    if (config::is_cloud_mode() && ctx->two_phase_commit && ctx->is_mow_table()) {

        return Status::NotSupported("http stream 2pc is unsupported for mow table");

    }

    ctx->db = ctx->put_result.pipeline_params.db_name;

    ctx->table = ctx->put_result.pipeline_params.table_name;

    ctx->txn_id = ctx->put_result.pipeline_params.txn_conf.txn_id;

    ctx->label = ctx->put_result.pipeline_params.import_label;

    ctx->put_result.pipeline_params.__set_wal_id(ctx->wal_id);

    if (http_req != nullptr && http_req->header(HTTP_GROUP_COMMIT) == "async_mode") {

        // FIXME find a way to avoid chunked stream load write large WALs

        size_t content_length = 0;

        if (!http_req->header(HttpHeaders::CONTENT_LENGTH).empty()) {

            try {

                content_length = std::stol(http_req->header(HttpHeaders::CONTENT_LENGTH));

            } catch (const std::exception& e) {

                return Status::InvalidArgument("invalid HTTP header CONTENT_LENGTH={}: {}",

                                               http_req->header(HttpHeaders::CONTENT_LENGTH),

                                               e.what());

            }

            if (ctx->format == TFileFormatType::FORMAT_CSV_GZ ||

                ctx->format == TFileFormatType::FORMAT_CSV_LZO ||

                ctx->format == TFileFormatType::FORMAT_CSV_BZ2 ||

                ctx->format == TFileFormatType::FORMAT_CSV_LZ4FRAME ||

                ctx->format == TFileFormatType::FORMAT_CSV_LZOP ||

                ctx->format == TFileFormatType::FORMAT_CSV_LZ4BLOCK ||

                ctx->format == TFileFormatType::FORMAT_CSV_SNAPPYBLOCK) {

                content_length *= 3;

            }

        }

        ctx->put_result.pipeline_params.__set_content_length(content_length);

    }

    TPipelineFragmentParamsList mocked;

    return _exec_env->stream_load_executor()->execute_plan_fragment(ctx, mocked);

}

void HttpStreamAction::_save_stream_load_record(std::shared_ptr<StreamLoadContext> ctx,

                                                const std::string& str) {

    std::shared_ptr<StreamLoadRecorder> stream_load_recorder =

            ExecEnv::GetInstance()->storage_engine().get_stream_load_recorder();

    if (stream_load_recorder != nullptr) {

        std::string key =

                std::to_string(ctx->start_millis + ctx->load_cost_millis) + "_" + ctx->label;

        auto st = stream_load_recorder->put(key, str);

        if (st.ok()) {

            LOG(INFO) << "put stream_load_record rocksdb successfully. label: " << ctx->label

                      << ", key: " << key;

        }

    } else {

        LOG(WARNING) << "put stream_load_record rocksdb failed. stream_load_recorder is null.";

    }

}

Status HttpStreamAction::_handle_group_commit(HttpRequest* req,

                                              std::shared_ptr<StreamLoadContext> ctx) {

    std::string group_commit_mode = req->header(HTTP_GROUP_COMMIT);

    if (!group_commit_mode.empty() && !iequal(group_commit_mode, "sync_mode") &&

        !iequal(group_commit_mode, "async_mode") && !iequal(group_commit_mode, "off_mode")) {

        return Status::InvalidArgument(

                "group_commit can only be [async_mode, sync_mode, off_mode]");

    }

    if (config::wait_internal_group_commit_finish) {

        group_commit_mode = "sync_mode";

    }

    int64_t content_length = req->header(HttpHeaders::CONTENT_LENGTH).empty()

                                     ? 0

                                     : std::stoll(req->header(HttpHeaders::CONTENT_LENGTH));

    if (content_length < 0) {

        std::stringstream ss;

        ss << "This http load content length <0 (" << content_length

           << "), please check your content length.";

        LOG(WARNING) << ss.str();

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

    }

    // allow chunked stream load in flink

    auto is_chunk =

            !req->header(HttpHeaders::TRANSFER_ENCODING).empty() &&

            req->header(HttpHeaders::TRANSFER_ENCODING).find("chunked") != std::string::npos;

    if (group_commit_mode.empty() || iequal(group_commit_mode, "off_mode") ||

        (content_length == 0 && !is_chunk)) {

        // off_mode and empty

        ctx->group_commit = false;

        return Status::OK();

    }

    if (is_chunk) {

        ctx->label = "";

    }

    auto partial_columns = !req->header(HTTP_PARTIAL_COLUMNS).empty() &&

                           iequal(req->header(HTTP_PARTIAL_COLUMNS), "true");

    auto temp_partitions = !req->header(HTTP_TEMP_PARTITIONS).empty();

    auto partitions = !req->header(HTTP_PARTITIONS).empty();

    if (!partial_columns && !partitions && !temp_partitions && !ctx->two_phase_commit) {

        if (!config::wait_internal_group_commit_finish && !ctx->label.empty()) {

            return Status::InvalidArgument("label and group_commit can't be set at the same time");

        }

        ctx->group_commit = true;

        if (iequal(group_commit_mode, "async_mode")) {

            if (!load_size_smaller_than_wal_limit(content_length)) {

                std::stringstream ss;

                ss << "There is no space for group commit http load async WAL. This http load "

                      "size is "

                   << content_length << ". WAL dir info: "

                   << ExecEnv::GetInstance()->wal_mgr()->get_wal_dirs_info_string();

                LOG(WARNING) << ss.str();

                return Status::Error<EXCEEDED_LIMIT>(ss.str());

            }

        }

    }

    return Status::OK();

}

} // namespace doris