GrpcRequestHandler.cpp

// Copyright (C) 2019-2020 Zilliz. All rights reserved.
//
// 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 "server/grpc_impl/GrpcRequestHandler.h"

#include <fiu-local.h>
#include <algorithm>
#include <memory>
#include <string>
#include <unordered_map>
#include <utility>
#include <vector>

#include "context/HybridSearchContext.h"
#include "query/BinaryQuery.h"
#include "server/ValidationUtil.h"
#include "server/context/ConnectionContext.h"
#include "tracing/TextMapCarrier.h"
#include "tracing/TracerUtil.h"
#include "utils/Log.h"
#include "utils/LogUtil.h"
#include "utils/TimeRecorder.h"

namespace milvus {
namespace server {
namespace grpc {

const char* EXTRA_PARAM_KEY = "params";
const size_t MAXIMUM_FIELD_NUM = 64;

::milvus::grpc::ErrorCode
ErrorMap(ErrorCode code) {
    static const std::map<ErrorCode, ::milvus::grpc::ErrorCode> code_map = {
        {SERVER_UNEXPECTED_ERROR, ::milvus::grpc::ErrorCode::UNEXPECTED_ERROR},
        {SERVER_UNSUPPORTED_ERROR, ::milvus::grpc::ErrorCode::UNEXPECTED_ERROR},
        {SERVER_NULL_POINTER, ::milvus::grpc::ErrorCode::UNEXPECTED_ERROR},
        {SERVER_INVALID_ARGUMENT, ::milvus::grpc::ErrorCode::ILLEGAL_ARGUMENT},
        {SERVER_FILE_NOT_FOUND, ::milvus::grpc::ErrorCode::FILE_NOT_FOUND},
        {SERVER_NOT_IMPLEMENT, ::milvus::grpc::ErrorCode::UNEXPECTED_ERROR},
        {SERVER_CANNOT_CREATE_FOLDER, ::milvus::grpc::ErrorCode::CANNOT_CREATE_FOLDER},
        {SERVER_CANNOT_CREATE_FILE, ::milvus::grpc::ErrorCode::CANNOT_CREATE_FILE},
        {SERVER_CANNOT_DELETE_FOLDER, ::milvus::grpc::ErrorCode::CANNOT_DELETE_FOLDER},
        {SERVER_CANNOT_DELETE_FILE, ::milvus::grpc::ErrorCode::CANNOT_DELETE_FILE},
        {SERVER_COLLECTION_NOT_EXIST, ::milvus::grpc::ErrorCode::COLLECTION_NOT_EXISTS},
        {SERVER_INVALID_COLLECTION_NAME, ::milvus::grpc::ErrorCode::ILLEGAL_COLLECTION_NAME},
        {SERVER_INVALID_COLLECTION_DIMENSION, ::milvus::grpc::ErrorCode::ILLEGAL_DIMENSION},
        {SERVER_INVALID_VECTOR_DIMENSION, ::milvus::grpc::ErrorCode::ILLEGAL_DIMENSION},
        {SERVER_INVALID_FIELD_NAME, ::milvus::grpc::ErrorCode::ILLEGAL_ARGUMENT},
        {SERVER_INVALID_FIELD_NUM, ::milvus::grpc::ErrorCode::ILLEGAL_ARGUMENT},

        {SERVER_INVALID_INDEX_TYPE, ::milvus::grpc::ErrorCode::ILLEGAL_INDEX_TYPE},
        {SERVER_INVALID_ROWRECORD, ::milvus::grpc::ErrorCode::ILLEGAL_ROWRECORD},
        {SERVER_INVALID_ROWRECORD_ARRAY, ::milvus::grpc::ErrorCode::ILLEGAL_ROWRECORD},
        {SERVER_INVALID_TOPK, ::milvus::grpc::ErrorCode::ILLEGAL_TOPK},
        {SERVER_INVALID_NPROBE, ::milvus::grpc::ErrorCode::ILLEGAL_ARGUMENT},
        {SERVER_INVALID_INDEX_NLIST, ::milvus::grpc::ErrorCode::ILLEGAL_NLIST},
        {SERVER_INVALID_INDEX_METRIC_TYPE, ::milvus::grpc::ErrorCode::ILLEGAL_METRIC_TYPE},
        {SERVER_INVALID_INDEX_FILE_SIZE, ::milvus::grpc::ErrorCode::ILLEGAL_ARGUMENT},
        {SERVER_ILLEGAL_VECTOR_ID, ::milvus::grpc::ErrorCode::ILLEGAL_VECTOR_ID},
        {SERVER_ILLEGAL_SEARCH_RESULT, ::milvus::grpc::ErrorCode::ILLEGAL_SEARCH_RESULT},
        {SERVER_CACHE_FULL, ::milvus::grpc::ErrorCode::CACHE_FAILED},
        {DB_META_TRANSACTION_FAILED, ::milvus::grpc::ErrorCode::META_FAILED},
        {SERVER_BUILD_INDEX_ERROR, ::milvus::grpc::ErrorCode::BUILD_INDEX_ERROR},
        {SERVER_OUT_OF_MEMORY, ::milvus::grpc::ErrorCode::OUT_OF_MEMORY},
    };

    if (code_map.find(code) != code_map.end()) {
        return code_map.at(code);
    } else {
        return ::milvus::grpc::ErrorCode::UNEXPECTED_ERROR;
    }
}

std::string
RequestMap(BaseRequest::RequestType request_type) {
    static const std::unordered_map<BaseRequest::RequestType, std::string> request_map = {
        {BaseRequest::kInsert, "Insert"},
        {BaseRequest::kCreateIndex, "CreateIndex"},
        {BaseRequest::kSearch, "Search"},
        {BaseRequest::kSearchByID, "SearchByID"},
        {BaseRequest::kHybridSearch, "HybridSearch"},
        {BaseRequest::kFlush, "Flush"},
        {BaseRequest::kCompact, "Compact"},
    };

    if (request_map.find(request_type) != request_map.end()) {
        return request_map.at(request_type);
    } else {
        return "OtherRequest";
    }
}

namespace {
void
CopyRowRecords(const google::protobuf::RepeatedPtrField<::milvus::grpc::VectorRowRecord>& grpc_records,
               const google::protobuf::RepeatedField<google::protobuf::int64>& grpc_id_array,
               engine::VectorsData& vectors) {
    // step 1: copy vector data
    int64_t float_data_size = 0, binary_data_size = 0;
    for (auto& record : grpc_records) {
        float_data_size += record.float_data_size();
        binary_data_size += record.binary_data().size();
    }

    std::vector<float> float_array(float_data_size, 0.0f);
    std::vector<uint8_t> binary_array(binary_data_size, 0);
    int64_t float_offset = 0, binary_offset = 0;
    if (float_data_size > 0) {
        for (auto& record : grpc_records) {
            memcpy(&float_array[float_offset], record.float_data().data(), record.float_data_size() * sizeof(float));
            float_offset += record.float_data_size();
        }
    } else if (binary_data_size > 0) {
        for (auto& record : grpc_records) {
            memcpy(&binary_array[binary_offset], record.binary_data().data(), record.binary_data().size());
            binary_offset += record.binary_data().size();
        }
    }

    // step 2: copy id array
    std::vector<int64_t> id_array;
    if (grpc_id_array.size() > 0) {
        id_array.resize(grpc_id_array.size());
        memcpy(id_array.data(), grpc_id_array.data(), grpc_id_array.size() * sizeof(int64_t));
    }

    // step 3: contruct vectors
    vectors.vector_count_ = grpc_records.size();
    vectors.float_data_.swap(float_array);
    vectors.binary_data_.swap(binary_array);
    vectors.id_array_.swap(id_array);
}

void
DeSerialization(const ::milvus::grpc::GeneralQuery& general_query, query::BooleanQueryPtr& boolean_clause,
                query::QueryPtr& query_ptr) {
    if (general_query.has_boolean_query()) {
        boolean_clause->SetOccur((query::Occur)general_query.boolean_query().occur());
        for (uint64_t i = 0; i < general_query.boolean_query().general_query_size(); ++i) {
            if (general_query.boolean_query().general_query(i).has_boolean_query()) {
                query::BooleanQueryPtr query = std::make_shared<query::BooleanQuery>();
                DeSerialization(general_query.boolean_query().general_query(i), query, query_ptr);
                boolean_clause->AddBooleanQuery(query);
            } else {
                auto leaf_query = std::make_shared<query::LeafQuery>();
                auto query = general_query.boolean_query().general_query(i);
                //                if (query.has_term_query()) {
                //                    query::TermQueryPtr term_query = std::make_shared<query::TermQuery>();
                //                    term_query->field_name = query.term_query().field_name();
                //                    term_query->boost = query.term_query().boost();
                //                    size_t int_size = query.term_query().int_value_size();
                //                    size_t double_size = query.term_query().double_value_size();
                //                    if (int_size > 0) {
                //                        term_query->field_value.resize(int_size * sizeof(int64_t));
                //                        memcpy(term_query->field_value.data(), query.term_query().int_value().data(),
                //                               int_size * sizeof(int64_t));
                //                    } else if (double_size > 0) {
                //                        term_query->field_value.resize(double_size * sizeof(double));
                //                        memcpy(term_query->field_value.data(),
                //                        query.term_query().double_value().data(),
                //                               double_size * sizeof(double));
                //                    }
                //                    leaf_query->term_query = term_query;
                //                    boolean_clause->AddLeafQuery(leaf_query);
                //                }
                //                if (query.has_range_query()) {
                //                    query::RangeQueryPtr range_query = std::make_shared<query::RangeQuery>();
                //                    range_query->field_name = query.range_query().field_name();
                //                    range_query->boost = query.range_query().boost();
                //                    range_query->compare_expr.resize(query.range_query().operand_size());
                //                    for (uint64_t j = 0; j < query.range_query().operand_size(); ++j) {
                //                        range_query->compare_expr[j].compare_operator =
                //                            query::CompareOperator(query.range_query().operand(j).operator_());
                //                        range_query->compare_expr[j].operand =
                //                        query.range_query().operand(j).operand();
                //                    }
                //                    leaf_query->range_query = range_query;
                //                    boolean_clause->AddLeafQuery(leaf_query);
                //                }
                if (query.has_vector_query()) {
                    query::VectorQueryPtr vector_query = std::make_shared<query::VectorQuery>();

                    engine::VectorsData vectors;
                    CopyRowRecords(query.vector_query().records(),
                                   google::protobuf::RepeatedField<google::protobuf::int64>(), vectors);

                    vector_query->query_vector.float_data = vectors.float_data_;
                    vector_query->query_vector.binary_data = vectors.binary_data_;

                    vector_query->boost = query.vector_query().query_boost();
                    vector_query->field_name = query.vector_query().field_name();
                    vector_query->topk = query.vector_query().topk();

                    milvus::json json_params;
                    for (int j = 0; j < query.vector_query().extra_params_size(); j++) {
                        const ::milvus::grpc::KeyValuePair& extra = query.vector_query().extra_params(j);
                        if (extra.key() == EXTRA_PARAM_KEY) {
                            json_params = json::parse(extra.value());
                        }
                    }
                    vector_query->extra_params = json_params;

                    // TODO(yukun): remove hardcode here
                    std::string vector_placeholder = "placeholder_1";
                    query_ptr->vectors.insert(std::make_pair(vector_placeholder, vector_query));

                    leaf_query->vector_placeholder = vector_placeholder;
                    boolean_clause->AddLeafQuery(leaf_query);
                }
            }
        }
    }
}

void
ConstructResults(const TopKQueryResult& result, ::milvus::grpc::QueryResult* response) {
    if (!response) {
        return;
    }

    response->set_row_num(result.row_num_);

    response->mutable_entities()->mutable_ids()->Resize(static_cast<int>(result.id_list_.size()), 0);
    memcpy(response->mutable_entities()->mutable_ids()->mutable_data(), result.id_list_.data(),
           result.id_list_.size() * sizeof(int64_t));

    response->mutable_distances()->Resize(static_cast<int>(result.distance_list_.size()), 0.0);
    memcpy(response->mutable_distances()->mutable_data(), result.distance_list_.data(),
           result.distance_list_.size() * sizeof(float));
}

void
ConstructEntityResults(const std::vector<engine::AttrsData>& attrs, const std::vector<engine::VectorsData>& vectors,
                       std::vector<std::string>& field_names, ::milvus::grpc::Entities* response) {
    if (!response) {
        return;
    }

    //    if (field_names.empty()) {
    //        if (attrs.size() > 0) {
    //            auto attr_it = attrs[0].attr_type_.begin();
    //            for (; attr_it != attrs[0].attr_type_.end(); attr_it++) {
    //                field_names.emplace_back(attr_it->first);
    //            }
    //        }
    //    }

    std::string vector_field_name;
    for (uint64_t i = 0; i < field_names.size(); i++) {
        auto field_name = field_names[i];
        if (!attrs.empty()) {
            if (attrs[0].attr_type_.find(field_name) != attrs[0].attr_type_.end()) {
                auto grpc_field = response->add_fields();
                grpc_field->set_field_name(field_name);
                grpc_field->set_type((::milvus::grpc::DataType)attrs[0].attr_type_.at(field_name));
                auto grpc_attr_data = grpc_field->mutable_attr_record();

                std::vector<int32_t> int32_data;
                std::vector<int64_t> int64_data;
                std::vector<float> float_data;
                std::vector<double> double_data;
                for (auto& attr : attrs) {
                    if (attr.attr_data_.find(field_name) == attr.attr_data_.end()) {
                        continue;
                    }
                    auto attr_data = attr.attr_data_.at(field_name);
                    int32_t grpc_int32_data;
                    int64_t grpc_int64_data;
                    float grpc_float_data;
                    double grpc_double_data;
                    switch (attr.attr_type_.at(field_name)) {
                        case engine::meta::hybrid::DataType::INT8: {
                            if (attr_data.size() == sizeof(int8_t)) {
                                grpc_int32_data = attr_data[0];
                                int32_data.emplace_back(grpc_int32_data);
                            } else {
                                response->mutable_status()->set_error_code(::milvus::grpc::ErrorCode::UNEXPECTED_ERROR);
                                return;
                            }
                            break;
                        }
                        case engine::meta::hybrid::DataType::INT16: {
                            if (attr_data.size() == sizeof(int16_t)) {
                                int16_t value;
                                memcpy(&value, attr_data.data(), sizeof(int16_t));
                                grpc_int32_data = value;
                                int32_data.emplace_back(grpc_int32_data);
                            } else {
                                response->mutable_status()->set_error_code(::milvus::grpc::ErrorCode::UNEXPECTED_ERROR);
                                return;
                            }
                            break;
                        }
                        case engine::meta::hybrid::DataType::INT32: {
                            if (attr_data.size() == sizeof(int32_t)) {
                                memcpy(&grpc_int32_data, attr_data.data(), sizeof(int32_t));
                                int32_data.emplace_back(grpc_int32_data);
                            } else {
                                response->mutable_status()->set_error_code(::milvus::grpc::ErrorCode::UNEXPECTED_ERROR);
                                return;
                            }
                            break;
                        }
                        case engine::meta::hybrid::DataType::INT64: {
                            if (attr_data.size() == sizeof(int64_t)) {
                                memcpy(&grpc_int64_data, attr_data.data(), sizeof(int64_t));
                                int64_data.emplace_back(grpc_int64_data);
                            } else {
                                response->mutable_status()->set_error_code(::milvus::grpc::ErrorCode::UNEXPECTED_ERROR);
                                return;
                            }
                            break;
                        }
                        case engine::meta::hybrid::DataType::FLOAT: {
                            if (attr_data.size() == sizeof(float)) {
                                float value;
                                memcpy(&value, attr_data.data(), sizeof(float));
                                grpc_float_data = value;
                                float_data.emplace_back(grpc_float_data);
                            } else {
                                response->mutable_status()->set_error_code(::milvus::grpc::ErrorCode::UNEXPECTED_ERROR);
                                return;
                            }
                            break;
                        }
                        case engine::meta::hybrid::DataType::DOUBLE: {
                            if (attr_data.size() == sizeof(double)) {
                                memcpy(&grpc_double_data, attr_data.data(), sizeof(double));
                                double_data.emplace_back(grpc_double_data);
                            } else {
                                response->mutable_status()->set_error_code(::milvus::grpc::ErrorCode::UNEXPECTED_ERROR);
                                return;
                            }
                            break;
                        }
                        default: { break; }
                    }
                }
                if (!int32_data.empty()) {
                    grpc_attr_data->mutable_int32_value()->Resize(static_cast<int>(int32_data.size()), 0);
                    memcpy(grpc_attr_data->mutable_int32_value()->mutable_data(), int32_data.data(),
                           int32_data.size() * sizeof(int32_t));
                } else if (!int64_data.empty()) {
                    grpc_attr_data->mutable_int64_value()->Resize(static_cast<int>(int64_data.size()), 0);
                    memcpy(grpc_attr_data->mutable_int64_value()->mutable_data(), int64_data.data(),
                           int64_data.size() * sizeof(int64_t));
                } else if (!float_data.empty()) {
                    grpc_attr_data->mutable_float_value()->Resize(static_cast<int>(float_data.size()), 0.0);
                    memcpy(grpc_attr_data->mutable_float_value()->mutable_data(), float_data.data(),
                           float_data.size() * sizeof(float));
                } else if (!double_data.empty()) {
                    grpc_attr_data->mutable_double_value()->Resize(static_cast<int>(double_data.size()), 0.0);
                    memcpy(grpc_attr_data->mutable_double_value()->mutable_data(), double_data.data(),
                           double_data.size() * sizeof(double));
                }
            } else {
                vector_field_name = field_name;
            }
        }
    }

    if (!vector_field_name.empty()) {
        auto size = vectors.size();
        response->mutable_ids()->Resize(static_cast<int>(vectors.size()), 0);
        std::vector<int64_t> id_array(size);
        for (int64_t i = 0; i < size; i++) {
            id_array[i] = vectors[i].id_array_[0];
        }
        memcpy(response->mutable_ids()->mutable_data(), id_array.data(), size * sizeof(int64_t));

        auto grpc_field = response->add_fields();
        grpc_field->set_field_name(vector_field_name);
        ::milvus::grpc::VectorRecord* grpc_vector_data = grpc_field->mutable_vector_record();
        for (auto& vector : vectors) {
            auto grpc_data = grpc_vector_data->add_records();
            if (!vector.float_data_.empty()) {
                grpc_field->set_type(::milvus::grpc::DataType::FLOAT_VECTOR);
                grpc_data->mutable_float_data()->Resize(vector.float_data_.size(), 0);
                memcpy(grpc_data->mutable_float_data()->mutable_data(), vector.float_data_.data(),
                       vector.float_data_.size() * sizeof(float));
            } else if (!vector.binary_data_.empty()) {
                grpc_field->set_type(::milvus::grpc::DataType::BINARY_VECTOR);
                grpc_data->mutable_binary_data()->resize(vector.binary_data_.size());
                memcpy(grpc_data->mutable_binary_data()->data(), vector.binary_data_.data(),
                       vector.binary_data_.size() * sizeof(uint8_t));
            }
        }
    }
}

class GrpcConnectionContext : public milvus::server::ConnectionContext {
 public:
    explicit GrpcConnectionContext(::grpc::ServerContext* context) : context_(context) {
    }

    bool
    IsConnectionBroken() const override {
        if (context_ == nullptr) {
            return true;
        }

        return context_->IsCancelled();
    }

 private:
    ::grpc::ServerContext* context_ = nullptr;
};

}  // namespace

namespace {

#define REQ_ID ("request_id")

std::atomic<int64_t> _sequential_id;

int64_t
get_sequential_id() {
    return _sequential_id++;
}

void
set_request_id(::grpc::ServerContext* context, const std::string& request_id) {
    if (not context) {
        // error
        LOG_SERVER_ERROR_ << "set_request_id: grpc::ServerContext is nullptr" << std::endl;
        return;
    }

    context->AddInitialMetadata(REQ_ID, request_id);
}

std::string
get_request_id(::grpc::ServerContext* context) {
    if (not context) {
        // error
        LOG_SERVER_ERROR_ << "get_request_id: grpc::ServerContext is nullptr" << std::endl;
        return "INVALID_ID";
    }

    auto server_metadata = context->server_metadata();

    auto request_id_kv = server_metadata.find(REQ_ID);
    if (request_id_kv == server_metadata.end()) {
        // error
        LOG_SERVER_ERROR_ << std::string(REQ_ID) << " not found in grpc.server_metadata" << std::endl;
        return "INVALID_ID";
    }

    return request_id_kv->second.data();
}

}  // namespace

GrpcRequestHandler::GrpcRequestHandler(const std::shared_ptr<opentracing::Tracer>& tracer)
    : tracer_(tracer), random_num_generator_() {
    std::random_device random_device;
    random_num_generator_.seed(random_device());
}

void
GrpcRequestHandler::OnPostRecvInitialMetaData(
    ::grpc::experimental::ServerRpcInfo* server_rpc_info,
    ::grpc::experimental::InterceptorBatchMethods* interceptor_batch_methods) {
    std::unordered_map<std::string, std::string> text_map;
    auto* metadata_map = interceptor_batch_methods->GetRecvInitialMetadata();
    auto context_kv = metadata_map->find(tracing::TracerUtil::GetTraceContextHeaderName());
    if (context_kv != metadata_map->end()) {
        text_map[std::string(context_kv->first.data(), context_kv->first.length())] =
            std::string(context_kv->second.data(), context_kv->second.length());
    }
    // test debug mode
    //    if (std::string(server_rpc_info->method()).find("Search") != std::string::npos) {
    //        text_map["demo-debug-id"] = "debug-id";
    //    }

    tracing::TextMapCarrier carrier{text_map};
    auto span_context_maybe = tracer_->Extract(carrier);
    if (!span_context_maybe) {
        std::cerr << span_context_maybe.error().message() << std::endl;
        return;
    }
    auto span = tracer_->StartSpan(server_rpc_info->method(), {opentracing::ChildOf(span_context_maybe->get())});

    auto server_context = server_rpc_info->server_context();
    auto client_metadata = server_context->client_metadata();

    // if client provide request_id in metadata, milvus just use it,
    // else milvus generate a sequential id.
    std::string request_id;
    auto request_id_kv = client_metadata.find("request_id");
    if (request_id_kv != client_metadata.end()) {
        request_id = request_id_kv->second.data();
        LOG_SERVER_DEBUG_ << "client provide request_id: " << request_id;

        // if request_id is being used by another request,
        // convert it to request_id_n.
        std::lock_guard<std::mutex> lock(context_map_mutex_);
        if (context_map_.find(request_id) == context_map_.end()) {
            // if not found exist, mark
            context_map_[request_id] = nullptr;
        } else {
            // Finding a unused suffix
            int64_t suffix = 1;
            std::string try_request_id;
            bool exist = true;
            do {
                try_request_id = request_id + "_" + std::to_string(suffix);
                exist = context_map_.find(try_request_id) != context_map_.end();
                suffix++;
            } while (exist);
            context_map_[try_request_id] = nullptr;
        }
    } else {
        request_id = std::to_string(get_sequential_id());
        set_request_id(server_context, request_id);
        LOG_SERVER_DEBUG_ << "milvus generate request_id: " << request_id;
    }

    auto trace_context = std::make_shared<tracing::TraceContext>(span);
    auto context = std::make_shared<Context>(request_id);
    context->SetTraceContext(trace_context);
    SetContext(server_rpc_info->server_context(), context);
}

void
GrpcRequestHandler::OnPreSendMessage(::grpc::experimental::ServerRpcInfo* server_rpc_info,
                                     ::grpc::experimental::InterceptorBatchMethods* interceptor_batch_methods) {
    std::lock_guard<std::mutex> lock(context_map_mutex_);
    auto request_id = get_request_id(server_rpc_info->server_context());

    if (context_map_.find(request_id) == context_map_.end()) {
        // error
        LOG_SERVER_ERROR_ << "request_id " << request_id << " not found in context_map_";
        return;
    }
    context_map_[request_id]->GetTraceContext()->GetSpan()->Finish();
    context_map_.erase(request_id);
}

std::shared_ptr<Context>
GrpcRequestHandler::GetContext(::grpc::ServerContext* server_context) {
    std::lock_guard<std::mutex> lock(context_map_mutex_);
    auto request_id = get_request_id(server_context);

    auto iter = context_map_.find(request_id);
    if (iter == context_map_.end()) {
        LOG_SERVER_ERROR_ << "GetContext: request_id " << request_id << " not found in context_map_";
        return nullptr;
    }

    if (iter->second != nullptr) {
        ConnectionContextPtr connection_context = std::make_shared<GrpcConnectionContext>(server_context);
        iter->second->SetConnectionContext(connection_context);
    }
    return iter->second;
}

void
GrpcRequestHandler::SetContext(::grpc::ServerContext* server_context, const std::shared_ptr<Context>& context) {
    std::lock_guard<std::mutex> lock(context_map_mutex_);
    auto request_id = get_request_id(server_context);
    context_map_[request_id] = context;
}

uint64_t
GrpcRequestHandler::random_id() const {
    std::lock_guard<std::mutex> lock(random_mutex_);
    auto value = random_num_generator_();
    while (value == 0) {
        value = random_num_generator_();
    }
    return value;
}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

::grpc::Status
GrpcRequestHandler::CreateCollection(::grpc::ServerContext* context, const ::milvus::grpc::Mapping* request,
                                     ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::unordered_map<std::string, engine::meta::hybrid::DataType> field_types;
    std::unordered_map<std::string, milvus::json> field_index_params;
    std::unordered_map<std::string, std::string> field_params;
    if (request->fields_size() > MAXIMUM_FIELD_NUM) {
        Status status = Status{SERVER_INVALID_FIELD_NUM, "Maximum field's number should be limited to 64"};
        LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
        SET_RESPONSE(response, status, context);
        return ::grpc::Status::OK;
    }
    for (int i = 0; i < request->fields_size(); ++i) {
        auto field = request->fields(i);
        auto field_name = field.name();
        field_types.insert(std::make_pair(field_name, (engine::meta::hybrid::DataType)field.type()));

        milvus::json index_param;
        for (int j = 0; j < field.index_params_size(); j++) {
            index_param[field.index_params(j).key()] = field.index_params(j).value();
        }
        field_index_params.insert(std::make_pair(field_name, index_param));

        // Currently only one extra_param
        if (request->fields(i).extra_params_size() != 0) {
            auto extra_params = std::make_pair(request->fields(i).name(), request->fields(i).extra_params(0).value());
            field_params.insert(extra_params);
        } else {
            auto extra_params = std::make_pair(request->fields(i).name(), "");
            field_params.insert(extra_params);
        }
    }

    milvus::json json_params;
    for (int i = 0; i < request->extra_params_size(); i++) {
        const ::milvus::grpc::KeyValuePair& extra = request->extra_params(i);
        if (extra.key() == EXTRA_PARAM_KEY) {
            json_params = json::parse(extra.value());
        }
    }

    Status status = request_handler_.CreateHybridCollection(GetContext(context), request->collection_name(),
                                                            field_types, field_index_params, field_params, json_params);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context)

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::HasCollection(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                                  ::milvus::grpc::BoolReply* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    bool has_collection = false;

    Status status = request_handler_.HasCollection(GetContext(context), request->collection_name(), has_collection);
    response->set_bool_reply(has_collection);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::DropCollection(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                                   ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    Status status = request_handler_.DropCollection(GetContext(context), request->collection_name());

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);
    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::CreateIndex(::grpc::ServerContext* context, const ::milvus::grpc::IndexParam* request,
                                ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request)
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    milvus::json json_params;
    for (int i = 0; i < request->extra_params_size(); i++) {
        const ::milvus::grpc::KeyValuePair& extra = request->extra_params(i);
        if (extra.key() == EXTRA_PARAM_KEY) {
            json_params = json::parse(extra.value());
        }
    }

    Status status = request_handler_.CreateIndex(GetContext(context), request->collection_name(), request->field_name(),
                                                 request->index_name(), json_params);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);
    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::GetEntityByID(::grpc::ServerContext* context, const ::milvus::grpc::EntityIdentity* request,
                                  ::milvus::grpc::Entities* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::vector<int64_t> vector_ids;
    vector_ids.reserve(request->id_array_size());
    for (int i = 0; i < request->id_array_size(); i++) {
        vector_ids.push_back(request->id_array(i));
    }

    std::vector<std::string> field_names(request->field_names_size());
    for (int i = 0; i < request->field_names_size(); i++) {
        field_names[i] = request->field_names(i);
    }

    std::vector<engine::AttrsData> attrs;
    std::vector<engine::VectorsData> vectors;
    Status status = request_handler_.GetEntityByID(GetContext(context), request->collection_name(), field_names,
                                                   vector_ids, attrs, vectors);

    ConstructEntityResults(attrs, vectors, field_names, response);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::GetEntityIDs(::grpc::ServerContext* context, const ::milvus::grpc::GetEntityIDsParam* request,
                                 ::milvus::grpc::EntityIds* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::vector<int64_t> vector_ids;
    Status status = request_handler_.GetVectorIDs(GetContext(context), request->collection_name(),
                                                  request->segment_name(), vector_ids);

    if (!vector_ids.empty()) {
        response->mutable_entity_id_array()->Resize(vector_ids.size(), -1);
        memcpy(response->mutable_entity_id_array()->mutable_data(), vector_ids.data(),
               vector_ids.size() * sizeof(int64_t));
    }

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

//::grpc::Status
// GrpcRequestHandler::Search(::grpc::ServerContext* context, const ::milvus::grpc::SearchParam* request,
//                           ::milvus::grpc::QueryResult* response) {
//    CHECK_NULLPTR_RETURN(request);
//    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);
//
//    // step 1: copy vector data
//    engine::VectorsData vectors;
//    CopyRowRecords(request->query_record_array(), google::protobuf::RepeatedField<google::protobuf::int64>(),
//    vectors);
//
//    // step 2: partition tags
//    std::vector<std::string> partitions;
//    std::copy(request->partition_tag_array().begin(), request->partition_tag_array().end(),
//              std::back_inserter(partitions));
//
//    // step 3: parse extra parameters
//    milvus::json json_params;
//    for (int i = 0; i < request->extra_params_size(); i++) {
//        const ::milvus::grpc::KeyValuePair& extra = request->extra_params(i);
//        if (extra.key() == EXTRA_PARAM_KEY) {
//            json_params = json::parse(extra.value());
//        }
//    }
//
//    // step 4: search vectors
//    std::vector<std::string> file_ids;
//    TopKQueryResult result;
//    fiu_do_on("GrpcRequestHandler.Search.not_empty_file_ids", file_ids.emplace_back("test_file_id"));
//
//    Status status = request_handler_.Search(GetContext(context), request->collection_name(), vectors, request->topk(),
//                                            json_params, partitions, file_ids, result);
//
//    // step 5: construct and return result
//    ConstructResults(result, response);
//
//    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
//    SET_RESPONSE(response->mutable_status(), status, context);
//
//    return ::grpc::Status::OK;
//}

::grpc::Status
GrpcRequestHandler::SearchByID(::grpc::ServerContext* context, const ::milvus::grpc::SearchByIDParam* request,
                               ::milvus::grpc::QueryResult* response) {
    //    CHECK_NULLPTR_RETURN(request);
    //    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);
    //
    //    // step 1: partition tags
    //    std::vector<std::string> partitions;
    //    std::copy(request->partition_tag_array().begin(), request->partition_tag_array().end(),
    //              std::back_inserter(partitions));
    //
    //    // step 2: partition tags
    //    std::vector<int64_t> id_array;
    //    for (int i = 0; i < request->id_array_size(); i++) {
    //        id_array.push_back(request->id_array(i));
    //    }
    //
    //    // step 3: parse extra parameters
    //    milvus::json json_params;
    //    for (int i = 0; i < request->extra_params_size(); i++) {
    //        const ::milvus::grpc::KeyValuePair& extra = request->extra_params(i);
    //        if (extra.key() == EXTRA_PARAM_KEY) {
    //            json_params = json::parse(extra.value());
    //        }
    //    }
    //
    //    // step 4: search vectors
    //    TopKQueryResult result;
    //    Status status = request_handler_.SearchByID(GetContext(context), request->collection_name(), id_array,
    //                                                request->topk(), json_params, partitions, result);
    //
    //    // step 5: construct and return result
    //    ConstructResults(result, response);
    //
    //    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    //    SET_RESPONSE(response->mutable_status(), status, context);
    //
    //    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::SearchInFiles(::grpc::ServerContext* context, const ::milvus::grpc::SearchInFilesParam* request,
                                  ::milvus::grpc::QueryResult* response) {
    //    CHECK_NULLPTR_RETURN(request);
    //    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);
    //
    //    auto* search_request = &request->search_param();
    //
    //    // step 1: copy vector data
    //    engine::VectorsData vectors;
    //    CopyRowRecords(search_request->query_record_array(),
    //    google::protobuf::RepeatedField<google::protobuf::int64>(),
    //                   vectors);
    //
    //    // step 2: copy file id array
    //    std::vector<std::string> file_ids;
    //    std::copy(request->file_id_array().begin(), request->file_id_array().end(), std::back_inserter(file_ids));
    //
    //    // step 3: partition tags
    //    std::vector<std::string> partitions;
    //    std::copy(search_request->partition_tag_array().begin(), search_request->partition_tag_array().end(),
    //              std::back_inserter(partitions));
    //
    //    // step 4: parse extra parameters
    //    milvus::json json_params;
    //    for (int i = 0; i < search_request->extra_params_size(); i++) {
    //        const ::milvus::grpc::KeyValuePair& extra = search_request->extra_params(i);
    //        if (extra.key() == EXTRA_PARAM_KEY) {
    //            json_params = json::parse(extra.value());
    //        }
    //    }
    //
    //    // step 5: search vectors
    //    TopKQueryResult result;
    //    Status status = request_handler_.Search(GetContext(context), search_request->collection_name(), vectors,
    //                                            search_request->topk(), json_params, partitions, file_ids, result);
    //
    //    // step 6: construct and return result
    //    ConstructResults(result, response);
    //
    //    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    //    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::DescribeCollection(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                                       ::milvus::grpc::Mapping* response) {
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);
    std::unordered_map<std::string, engine::meta::hybrid::DataType> field_types;
    std::unordered_map<std::string, milvus::json> index_param;
    Status status = request_handler_.DescribeHybridCollection(GetContext(context), request->collection_name(),
                                                              field_types, index_param);

    response->set_collection_name(request->collection_name());
    auto field_it = field_types.begin();
    for (; field_it != field_types.end(); field_it++) {
        auto field = response->add_fields();
        field->set_name(field_it->first);
        field->set_type((milvus::grpc::DataType)field_it->second);
        for (auto& json_param : index_param.at(field_it->first).items()) {
            auto grpc_index_param = field->add_index_params();
            grpc_index_param->set_key(json_param.key());
            grpc_index_param->set_value(json_param.value());
        }
    }

    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);
    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::CountCollection(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                                    ::milvus::grpc::CollectionRowCount* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    int64_t row_count = 0;
    Status status = request_handler_.CountCollection(GetContext(context), request->collection_name(), row_count);
    response->set_collection_row_count(row_count);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::ShowCollections(::grpc::ServerContext* context, const ::milvus::grpc::Command* request,
                                    ::milvus::grpc::CollectionNameList* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::vector<std::string> collections;
    Status status = request_handler_.ShowCollections(GetContext(context), collections);
    for (auto& collection : collections) {
        response->add_collection_names(collection);
    }

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::ShowCollectionInfo(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                                       ::milvus::grpc::CollectionInfo* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::string collection_info;
    Status status =
        request_handler_.ShowCollectionInfo(GetContext(context), request->collection_name(), collection_info);
    response->set_json_info(collection_info);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::Cmd(::grpc::ServerContext* context, const ::milvus::grpc::Command* request,
                        ::milvus::grpc::StringReply* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::string reply;
    Status status;

    std::string cmd = request->cmd();
    std::vector<std::string> requests;
    if (cmd == "requests") {
        std::lock_guard<std::mutex> lock(context_map_mutex_);
        for (auto& iter : context_map_) {
            if (nullptr == iter.second) {
                continue;
            }
            if (iter.second->RequestID() == get_request_id(context)) {
                continue;
            }
            auto request_str = RequestMap(iter.second->GetRequestType()) + "-" + iter.second->RequestID();
            requests.emplace_back(request_str);
        }
        nlohmann::json reply_json;
        reply_json["requests"] = requests;
        reply = reply_json.dump();
        response->set_string_reply(reply);
    } else {
        status = request_handler_.Cmd(GetContext(context), cmd, reply);
        response->set_string_reply(reply);
    }

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::DeleteByID(::grpc::ServerContext* context, const ::milvus::grpc::DeleteByIDParam* request,
                               ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    // step 1: prepare id array
    std::vector<int64_t> vector_ids;
    for (int i = 0; i < request->id_array_size(); i++) {
        vector_ids.push_back(request->id_array(i));
    }

    // step 2: delete vector
    Status status = request_handler_.DeleteByID(GetContext(context), request->collection_name(), vector_ids);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::PreloadCollection(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                                      ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    Status status = request_handler_.PreloadCollection(GetContext(context), request->collection_name());

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::ReloadSegments(::grpc::ServerContext* context, const ::milvus::grpc::ReLoadSegmentsParam* request,
                                   ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::vector<std::string> file_ids;
    for (size_t i = 0; i < request->segment_id_array_size(); i++) {
        file_ids.push_back(request->segment_id_array(i));
    }

    Status status = request_handler_.ReLoadSegments(GetContext(context), request->collection_name(), file_ids);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::DescribeIndex(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                                  ::milvus::grpc::IndexParam* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    IndexParam param;
    Status status = request_handler_.DescribeIndex(GetContext(context), request->collection_name(), param);
    response->set_collection_name(param.collection_name_);
    response->set_index_name(param.index_name_);
    ::milvus::grpc::KeyValuePair* kv = response->add_extra_params();
    kv->set_key(EXTRA_PARAM_KEY);
    kv->set_value(param.extra_params_);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::DropIndex(::grpc::ServerContext* context, const ::milvus::grpc::IndexParam* request,
                              ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    Status status = request_handler_.DropIndex(GetContext(context), request->collection_name(), request->field_name(),
                                               request->index_name());

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::CreatePartition(::grpc::ServerContext* context, const ::milvus::grpc::PartitionParam* request,
                                    ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    Status status = request_handler_.CreatePartition(GetContext(context), request->collection_name(), request->tag());

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::HasPartition(::grpc::ServerContext* context, const ::milvus::grpc::PartitionParam* request,
                                 ::milvus::grpc::BoolReply* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    bool has_collection = false;

    Status status =
        request_handler_.HasPartition(GetContext(context), request->collection_name(), request->tag(), has_collection);
    response->set_bool_reply(has_collection);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::ShowPartitions(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                                   ::milvus::grpc::PartitionList* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::vector<PartitionParam> partitions;
    Status status = request_handler_.ShowPartitions(GetContext(context), request->collection_name(), partitions);
    for (auto& partition : partitions) {
        response->add_partition_tag_array(partition.tag_);
    }

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::DropPartition(::grpc::ServerContext* context, const ::milvus::grpc::PartitionParam* request,
                                  ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    Status status = request_handler_.DropPartition(GetContext(context), request->collection_name(), request->tag());

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::Flush(::grpc::ServerContext* context, const ::milvus::grpc::FlushParam* request,
                          ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    std::vector<std::string> collection_names;
    for (int32_t i = 0; i < request->collection_name_array().size(); i++) {
        collection_names.push_back(request->collection_name_array(i));
    }
    Status status = request_handler_.Flush(GetContext(context), collection_names);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::Compact(::grpc::ServerContext* context, const ::milvus::grpc::CollectionName* request,
                            ::milvus::grpc::Status* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    double compact_threshold = 0.1;  // compact trigger threshold: delete_counts/segment_counts
    Status status = request_handler_.Compact(GetContext(context), request->collection_name(), compact_threshold);

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response, status, context);

    return ::grpc::Status::OK;
}

/*******************************************New Interface*********************************************/

::grpc::Status
GrpcRequestHandler::Insert(::grpc::ServerContext* context, const ::milvus::grpc::InsertParam* request,
                           ::milvus::grpc::EntityIds* response) {
    //    engine::VectorsData vectors;
    //    CopyRowRecords(request->entity().vector_data(0).value(), request->entity_id_array(), vectors);

    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    auto field_size = request->fields_size();

    std::unordered_map<std::string, engine::VectorsData> vectors;
    std::vector<std::string> field_names;

    std::vector<int64_t> offsets;
    std::vector<std::vector<uint8_t>> attr_datas;
    uint64_t row_num;
    for (int i = 0; i < field_size; i++) {
        auto grpc_int32_size = request->fields(i).attr_record().int32_value_size();
        auto grpc_int64_size = request->fields(i).attr_record().int64_value_size();
        auto grpc_float_size = request->fields(i).attr_record().float_value_size();
        auto grpc_double_size = request->fields(i).attr_record().double_value_size();
        const auto& field = request->fields(i);
        auto field_name = field.field_name();

        field_names.emplace_back(field_name);
        std::vector<uint8_t> temp_data;
        if (grpc_int32_size > 0) {
            temp_data.resize(grpc_int32_size * sizeof(int32_t));
            memcpy(temp_data.data(), field.attr_record().int32_value().data(), grpc_int32_size * sizeof(int32_t));
            offsets.emplace_back(grpc_int32_size * sizeof(int32_t));
        } else if (grpc_int64_size > 0) {
            temp_data.resize(grpc_int64_size * sizeof(int64_t));
            memcpy(temp_data.data(), field.attr_record().int64_value().data(), grpc_int64_size * sizeof(int64_t));
            offsets.emplace_back(grpc_int64_size * sizeof(int64_t));
        } else if (grpc_float_size > 0) {
            temp_data.resize(grpc_float_size * sizeof(float));
            memcpy(temp_data.data(), field.attr_record().float_value().data(), grpc_float_size * sizeof(float));
            offsets.emplace_back(grpc_float_size * sizeof(float));
        } else if (grpc_double_size > 0) {
            temp_data.resize(grpc_double_size * sizeof(double));
            memcpy(temp_data.data(), field.attr_record().double_value().data(), grpc_double_size * sizeof(double));
            offsets.emplace_back(grpc_double_size * sizeof(double));
        } else {
            // vector field
            engine::VectorsData vector_data;
            CopyRowRecords(field.vector_record().records(), request->entity_id_array(), vector_data);
            vectors.insert(std::make_pair(field_name, vector_data));
            row_num = field.vector_record().records_size();
            break;
        }
        attr_datas.emplace_back(temp_data);
    }

    auto attr_size = std::accumulate(offsets.begin(), offsets.end(), decltype(offsets)::value_type(0));
    std::vector<uint8_t> attr_data(attr_size);
    int64_t offset = 0;
    for (auto& attr : attr_datas) {
        memcpy(attr_data.data() + offset, attr.data(), attr.size());
        offset += attr.size();
    }

    std::string collection_name = request->collection_name();
    std::string partition_tag = request->partition_tag();
    Status status = request_handler_.InsertEntity(GetContext(context), collection_name, partition_tag, row_num,
                                                  field_names, attr_data, vectors);

    response->mutable_entity_id_array()->Resize(static_cast<int>(vectors.begin()->second.id_array_.size()), 0);
    memcpy(response->mutable_entity_id_array()->mutable_data(), vectors.begin()->second.id_array_.data(),
           vectors.begin()->second.id_array_.size() * sizeof(int64_t));

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

::grpc::Status
GrpcRequestHandler::SearchPB(::grpc::ServerContext* context, const ::milvus::grpc::SearchParamPB* request,
                             ::milvus::grpc::QueryResult* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    auto boolean_query = std::make_shared<query::BooleanQuery>();
    auto query_ptr = std::make_shared<query::Query>();
    DeSerialization(request->general_query(), boolean_query, query_ptr);

    auto general_query = std::make_shared<query::GeneralQuery>();
    query::GenBinaryQuery(boolean_query, general_query->bin);

    Status status;

    if (!query::ValidateBinaryQuery(general_query->bin)) {
        status = Status{SERVER_INVALID_BINARY_QUERY, "Generate wrong binary query tree"};
        SET_RESPONSE(response->mutable_status(), status, context)
        return ::grpc::Status::OK;
    }

    std::vector<std::string> partition_list;
    partition_list.resize(request->partition_tag_array_size());
    for (uint64_t i = 0; i < request->partition_tag_array_size(); ++i) {
        partition_list[i] = request->partition_tag_array(i);
    }

    milvus::json json_params;
    for (int i = 0; i < request->extra_params_size(); i++) {
        const ::milvus::grpc::KeyValuePair& extra = request->extra_params(i);
        if (extra.key() == EXTRA_PARAM_KEY) {
            json_params = json::parse(extra.value());
        }
    }

    engine::QueryResult result;
    std::vector<std::string> field_names;
    status = request_handler_.HybridSearch(GetContext(context), request->collection_name(), partition_list,
                                           general_query, query_ptr, json_params, field_names, result);

    // step 6: construct and return result
    response->set_row_num(result.row_num_);
    auto grpc_entity = response->mutable_entities();
    ConstructEntityResults(result.attrs_, result.vectors_, field_names, grpc_entity);
    grpc_entity->mutable_ids()->Resize(static_cast<int>(result.result_ids_.size()), 0);
    memcpy(grpc_entity->mutable_ids()->mutable_data(), result.result_ids_.data(),
           result.result_ids_.size() * sizeof(int64_t));

    response->mutable_distances()->Resize(static_cast<int>(result.result_distances_.size()), 0.0);
    memcpy(response->mutable_distances()->mutable_data(), result.result_distances_.data(),
           result.result_distances_.size() * sizeof(float));

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

#if 0
Status
ParseTermQuery(const nlohmann::json& term_json,
               std::unordered_map<std::string, engine::meta::hybrid::DataType> field_type,
               query::TermQueryPtr& term_query) {
    std::string field_name = term_json["field"].get<std::string>();
    auto term_value_json = term_json["values"];
    if (!term_value_json.is_array()) {
        std::string msg = "Term json string is not an array";
        return Status{SERVER_INVALID_DSL_PARAMETER, msg};
    }

    auto term_size = term_value_json.size();
    term_query->field_name = field_name;
    term_query->field_value.resize(term_size * sizeof(int64_t));

    switch (field_type.at(field_name)) {
        case engine::meta::hybrid::DataType::INT8: {
            std::vector<int64_t> term_value(term_size, 0);
            for (uint64_t i = 0; i < term_size; i++) {
                term_value[i] = term_value_json[i].get<int8_t>();
            }
            memcpy(term_query->field_value.data(), term_value.data(), term_size * sizeof(int64_t));
            break;
        }
        case engine::meta::hybrid::DataType::INT16: {
            std::vector<int64_t> term_value(term_size, 0);
            for (uint64_t i = 0; i < term_size; i++) {
                term_value[i] = term_value_json[i].get<int16_t>();
            }
            memcpy(term_query->field_value.data(), term_value.data(), term_size * sizeof(int64_t));
            break;
        }
        case engine::meta::hybrid::DataType::INT32: {
            std::vector<int64_t> term_value(term_size, 0);
            for (uint64_t i = 0; i < term_size; i++) {
                term_value[i] = term_value_json[i].get<int32_t>();
            }
            memcpy(term_query->field_value.data(), term_value.data(), term_size * sizeof(int64_t));
            break;
        }
        case engine::meta::hybrid::DataType::INT64: {
            std::vector<int64_t> term_value(term_size, 0);
            for (uint64_t i = 0; i < term_size; ++i) {
                term_value[i] = term_value_json[i].get<int64_t>();
            }
            memcpy(term_query->field_value.data(), term_value.data(), term_size * sizeof(int64_t));
            break;
        }
        case engine::meta::hybrid::DataType::FLOAT: {
            std::vector<double> term_value(term_size, 0);
            for (uint64_t i = 0; i < term_size; ++i) {
                term_value[i] = term_value_json[i].get<float>();
            }
            memcpy(term_query->field_value.data(), term_value.data(), term_size * sizeof(double));
            break;
        }
        case engine::meta::hybrid::DataType::DOUBLE: {
            std::vector<double> term_value(term_size, 0);
            for (uint64_t i = 0; i < term_size; ++i) {
                term_value[i] = term_value_json[i].get<double>();
            }
            memcpy(term_query->field_value.data(), term_value.data(), term_size * sizeof(double));
            break;
        }
    }
    return Status::OK();
}

Status
ParseRangeQuery(const nlohmann::json& range_json, query::RangeQueryPtr& range_query) {
    std::string field_name = range_json["field"];
    range_query->field_name = field_name;

    auto range_value_json = range_json["values"];
    if (range_value_json.contains("lt")) {
        query::CompareExpr compare_expr;
        compare_expr.compare_operator = query::CompareOperator::LT;
        compare_expr.operand = range_value_json["lt"].get<std::string>();
        range_query->compare_expr.emplace_back(compare_expr);
    }
    if (range_value_json.contains("lte")) {
        query::CompareExpr compare_expr;
        compare_expr.compare_operator = query::CompareOperator::LTE;
        compare_expr.operand = range_value_json["lte"].get<std::string>();
        range_query->compare_expr.emplace_back(compare_expr);
    }
    if (range_value_json.contains("eq")) {
        query::CompareExpr compare_expr;
        compare_expr.compare_operator = query::CompareOperator::EQ;
        compare_expr.operand = range_value_json["eq"].get<std::string>();
        range_query->compare_expr.emplace_back(compare_expr);
    }
    if (range_value_json.contains("ne")) {
        query::CompareExpr compare_expr;
        compare_expr.compare_operator = query::CompareOperator::NE;
        compare_expr.operand = range_value_json["ne"].get<std::string>();
        range_query->compare_expr.emplace_back(compare_expr);
    }
    if (range_value_json.contains("gt")) {
        query::CompareExpr compare_expr;
        compare_expr.compare_operator = query::CompareOperator::GT;
        compare_expr.operand = range_value_json["gt"].get<std::string>();
        range_query->compare_expr.emplace_back(compare_expr);
    }
    if (range_value_json.contains("gte")) {
        query::CompareExpr compare_expr;
        compare_expr.compare_operator = query::CompareOperator::GTE;
        compare_expr.operand = range_value_json["gte"].get<std::string>();
        range_query->compare_expr.emplace_back(compare_expr);
    }
    return Status::OK();
}
#endif

Status
GrpcRequestHandler::ProcessLeafQueryJson(const nlohmann::json& json, query::BooleanQueryPtr& query) {
    auto status = Status::OK();
    if (json.contains("term")) {
        auto leaf_query = std::make_shared<query::LeafQuery>();
        auto term_query = std::make_shared<query::TermQuery>();
        term_query->json_obj = json["term"];
        leaf_query->term_query = term_query;
        query->AddLeafQuery(leaf_query);
    } else if (json.contains("range")) {
        auto leaf_query = std::make_shared<query::LeafQuery>();
        auto range_query = std::make_shared<query::RangeQuery>();
        range_query->json_obj = json["range"];
        leaf_query->range_query = range_query;
        query->AddLeafQuery(leaf_query);
    } else if (json.contains("vector")) {
        auto leaf_query = std::make_shared<query::LeafQuery>();
        auto vector_json = json["vector"];

        leaf_query->vector_placeholder = vector_json.get<std::string>();
        query->AddLeafQuery(leaf_query);
    }
    return status;
}

Status
GrpcRequestHandler::ProcessBooleanQueryJson(const nlohmann::json& query_json, query::BooleanQueryPtr& boolean_query) {
    auto status = Status::OK();
    for (auto& el : query_json.items()) {
        if (el.key() == "must") {
            boolean_query->SetOccur(query::Occur::MUST);
            auto must_json = el.value();
            if (!must_json.is_array()) {
                std::string msg = "Must json string is not an array";
                return Status{SERVER_INVALID_DSL_PARAMETER, msg};
            }

            for (auto& json : must_json) {
                auto must_query = std::make_shared<query::BooleanQuery>();
                if (json.contains("must") || json.contains("should") || json.contains("must_not")) {
                    status = ProcessBooleanQueryJson(json, must_query);
                    if (!status.ok()) {
                        return status;
                    }
                    boolean_query->AddBooleanQuery(must_query);
                } else {
                    status = ProcessLeafQueryJson(json, boolean_query);
                    if (!status.ok()) {
                        return status;
                    }
                }
            }
        } else if (el.key() == "should") {
            boolean_query->SetOccur(query::Occur::SHOULD);
            auto should_json = el.value();
            if (!should_json.is_array()) {
                std::string msg = "Should json string is not an array";
                return Status{SERVER_INVALID_DSL_PARAMETER, msg};
            }

            for (auto& json : should_json) {
                auto should_query = std::make_shared<query::BooleanQuery>();
                if (json.contains("must") || json.contains("should") || json.contains("must_not")) {
                    status = ProcessBooleanQueryJson(json, should_query);
                    if (!status.ok()) {
                        return status;
                    }
                    boolean_query->AddBooleanQuery(should_query);
                } else {
                    status = ProcessLeafQueryJson(json, boolean_query);
                    if (!status.ok()) {
                        return status;
                    }
                }
            }
        } else if (el.key() == "must_not") {
            boolean_query->SetOccur(query::Occur::MUST_NOT);
            auto should_json = el.value();
            if (!should_json.is_array()) {
                std::string msg = "Must_not json string is not an array";
                return Status{SERVER_INVALID_DSL_PARAMETER, msg};
            }

            for (auto& json : should_json) {
                if (json.contains("must") || json.contains("should") || json.contains("must_not")) {
                    auto must_not_query = std::make_shared<query::BooleanQuery>();
                    status = ProcessBooleanQueryJson(json, must_not_query);
                    if (!status.ok()) {
                        return status;
                    }
                    boolean_query->AddBooleanQuery(must_not_query);
                } else {
                    status = ProcessLeafQueryJson(json, boolean_query);
                    if (!status.ok()) {
                        return status;
                    }
                }
            }
        } else {
            std::string msg = "Must json string doesnot include right query";
            return Status{SERVER_INVALID_DSL_PARAMETER, msg};
        }
    }

    return status;
}

Status
GrpcRequestHandler::DeserializeJsonToBoolQuery(
    const google::protobuf::RepeatedPtrField<::milvus::grpc::VectorParam>& vector_params, const std::string& dsl_string,
    query::BooleanQueryPtr& boolean_query, std::unordered_map<std::string, query::VectorQueryPtr>& vectors) {
    try {
        nlohmann::json dsl_json = json::parse(dsl_string);

        auto status = Status::OK();
        for (const auto& vector_param : vector_params) {
            std::string vector_string = vector_param.json();
            nlohmann::json vector_json = json::parse(vector_string);
            json::iterator it = vector_json.begin();
            std::string placeholder = it.key();

            auto vector_query = std::make_shared<query::VectorQuery>();
            json::iterator vector_param_it = it.value().begin();
            if (vector_param_it != it.value().end()) {
                vector_query->field_name = vector_param_it.key();
                int64_t topk = vector_param_it.value()["topk"];
                status = server::ValidateSearchTopk(topk);
                if (!status.ok()) {
                    return status;
                }
                vector_query->topk = topk;
                vector_query->extra_params = vector_param_it.value()["params"];
            }

            engine::VectorsData vector_data;
            CopyRowRecords(vector_param.row_record().records(),
                           google::protobuf::RepeatedField<google::protobuf::int64>(), vector_data);
            vector_query->query_vector.binary_data = vector_data.binary_data_;
            vector_query->query_vector.float_data = vector_data.float_data_;

            vectors.insert(std::make_pair(placeholder, vector_query));
        }
        if (dsl_json.contains("bool")) {
            auto boolean_query_json = dsl_json["bool"];
            status = ProcessBooleanQueryJson(boolean_query_json, boolean_query);
            if (!status.ok()) {
                return status;
            }
        }
        return status;
    } catch (std::exception& e) {
        return Status{SERVER_INVALID_DSL_PARAMETER, e.what()};
    }
}

::grpc::Status
GrpcRequestHandler::Search(::grpc::ServerContext* context, const ::milvus::grpc::SearchParam* request,
                           ::milvus::grpc::QueryResult* response) {
    CHECK_NULLPTR_RETURN(request);
    LOG_SERVER_INFO_ << LogOut("Request [%s] %s begin.", GetContext(context)->RequestID().c_str(), __func__);

    Status status;

    std::unordered_map<std::string, milvus::json> index_params;
    status = request_handler_.DescribeHybridCollection(GetContext(context), request->collection_name(), field_type_,
                                                       index_params);

    auto grpc_entity = response->mutable_entities();
    if (!status.ok()) {
        SET_RESPONSE(response->mutable_status(), status, context);
        return ::grpc::Status::OK;
    }

    query::BooleanQueryPtr boolean_query = std::make_shared<query::BooleanQuery>();
    query::QueryPtr query_ptr = std::make_shared<query::Query>();
    std::unordered_map<std::string, query::VectorQueryPtr> vectors;

    status = DeserializeJsonToBoolQuery(request->vector_param(), request->dsl(), boolean_query, vectors);
    if (!status.ok()) {
        SET_RESPONSE(response->mutable_status(), status, context);
        return ::grpc::Status::OK;
    }

    status = query::ValidateBooleanQuery(boolean_query);
    if (!status.ok()) {
        SET_RESPONSE(response->mutable_status(), status, context);
        return ::grpc::Status::OK;
    }

    query_ptr->vectors = vectors;

    query::GeneralQueryPtr general_query = std::make_shared<query::GeneralQuery>();
    query::GenBinaryQuery(boolean_query, general_query->bin);
    query_ptr->root = general_query->bin;

    if (!query::ValidateBinaryQuery(general_query->bin)) {
        status = Status{SERVER_INVALID_BINARY_QUERY, "Generate wrong binary query tree"};
        SET_RESPONSE(grpc_entity->mutable_status(), status, context);
        return ::grpc::Status::OK;
    }

    std::vector<std::string> partition_list;
    partition_list.resize(request->partition_tag_array_size());
    for (int i = 0; i < request->partition_tag_array_size(); ++i) {
        partition_list[i] = request->partition_tag_array(i);
    }

    milvus::json json_params;
    for (int i = 0; i < request->extra_params_size(); i++) {
        const ::milvus::grpc::KeyValuePair& extra = request->extra_params(i);
        if (extra.key() == EXTRA_PARAM_KEY) {
            json_params = json::parse(extra.value());
        }
    }

    engine::QueryResult result;
    std::vector<std::string> field_names;
    status = request_handler_.HybridSearch(GetContext(context), request->collection_name(), partition_list,
                                           general_query, query_ptr, json_params, field_names, result);

    // step 6: construct and return result
    response->set_row_num(result.row_num_);
    ConstructEntityResults(result.attrs_, result.vectors_, field_names, grpc_entity);

    grpc_entity->mutable_ids()->Resize(static_cast<int>(result.result_ids_.size()), 0);
    memcpy(grpc_entity->mutable_ids()->mutable_data(), result.result_ids_.data(),
           result.result_ids_.size() * sizeof(int64_t));

    response->mutable_distances()->Resize(static_cast<int>(result.result_distances_.size()), 0.0);
    memcpy(response->mutable_distances()->mutable_data(), result.result_distances_.data(),
           result.result_distances_.size() * sizeof(float));

    LOG_SERVER_INFO_ << LogOut("Request [%s] %s end.", GetContext(context)->RequestID().c_str(), __func__);
    SET_RESPONSE(response->mutable_status(), status, context);

    return ::grpc::Status::OK;
}

}  // namespace grpc
}  // namespace server
}  // namespace milvus