// 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.

#pragma once

#include <fmt/format.h>

#include <gen_cpp/Types_types.h>

#include <stddef.h>

#include <memory>

#include <string>

#include <vector>

#include "common/status.h"

#include "core/block/block.h"

#include "core/block/column_numbers.h"

#include "core/block/column_with_type_and_name.h"

#include "core/block/columns_with_type_and_name.h"

#include "core/data_type/data_type.h"

#include "core/types.h"

#include "exprs/function/function.h"

#include "exprs/function_context.h"

namespace doris {

class PFunctionCallRequest;

class PFunctionService_Stub;

class PValues;

} // namespace doris

namespace doris {

class RPCFnImpl {

public:

RPCFnImpl(const TFunction& fn);

~RPCFnImpl() = default;

Status vec_call(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

uint32_t result, size_t input_rows_count);

bool available() { return _client != nullptr; }

private:

Status _convert_block_to_proto(Block& block, const ColumnNumbers& arguments,

size_t input_rows_count, PFunctionCallRequest* request);

Status _convert_to_block(Block& block, const PValues& result, size_t pos);

std::shared_ptr<PFunctionService_Stub> _client;

std::string _function_name;

std::string _server_addr;

std::string _signature;

TFunction _fn;

};

class RPCPreparedFunction : public IPreparedFunction {

public:

~RPCPreparedFunction() override = default;

/// Get the main function name.

String get_name() const override { return "RPCPreparedFunction: "; }

Status execute(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

uint32_t result, size_t input_rows_count) const override {

auto* fn = reinterpret_cast<RPCFnImpl*>(

context->get_function_state(FunctionContext::FRAGMENT_LOCAL));

return fn->vec_call(context, block, arguments, result, input_rows_count);

}

};

class FunctionRPC : public IFunctionBase {

public:

FunctionRPC(const TFunction& fn, const DataTypes& argument_types,

const DataTypePtr& return_type);

static FunctionBasePtr create(const TFunction& fn, const ColumnsWithTypeAndName& argument_types,

const DataTypePtr& return_type) {

DataTypes data_types(argument_types.size());

for (size_t i = 0; i < argument_types.size(); ++i) {

data_types[i] = argument_types[i].type;

}

return std::make_shared<FunctionRPC>(fn, data_types, return_type);

}

/// Get the main function name.

String get_name() const override {

return fmt::format("{}: [{}/{}]", _tfn.name.function_name, _tfn.hdfs_location,

_tfn.scalar_fn.symbol);

}

const DataTypes& get_argument_types() const override { return _argument_types; }

const DataTypePtr& get_return_type() const override { return _return_type; }

PreparedFunctionPtr prepare(FunctionContext* context, const Block& sample_block,

const ColumnNumbers& arguments, uint32_t result) const override {

return std::make_shared<RPCPreparedFunction>();

}

Status open(FunctionContext* context, FunctionContext::FunctionStateScope scope) override;

bool is_use_default_implementation_for_constants() const override { return true; }

private:

DataTypes _argument_types;

DataTypePtr _return_type;

TFunction _tfn;

};

} // namespace doris