//   Copyright (c) 2018 PaddlePaddle Authors. 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.

#pragma once

#include <string>

#include "brpc/channel.h"
#include "paddle/fluid/framework/data_type.h"
#include "paddle/fluid/framework/lod_tensor.h"
#include "paddle/fluid/framework/scope.h"
#include "paddle/fluid/framework/selected_rows.h"
#include "paddle/fluid/framework/var_type.h"

#include "paddle/fluid/operators/distributed/send_recv.pb.h"

#include "google/protobuf/io/coded_stream.h"
#include "google/protobuf/io/zero_copy_stream.h"
#include "paddle/fluid/framework/tensor.h"
#include "paddle/fluid/operators/distributed/variable_response.h"

namespace paddle {
namespace operators {
namespace distributed {

class BRPCSourceWrapper : public Source {
 public:
  explicit BRPCSourceWrapper(const butil::IOBuf& iobuf) : source_(iobuf) {}
  ::google::protobuf::io::ZeroCopyInputStream* contents() override {
    return &source_;
  }

 private:
  butil::IOBufAsZeroCopyInputStream source_;
};

class BRPCVariableResponse : public VariableResponse {
 public:
  BRPCVariableResponse(const framework::Scope* scope,
                       const platform::DeviceContext* dev_ctx,
                       bool create_scope = false)
      : VariableResponse(scope, dev_ctx, create_scope) {}

  virtual ~BRPCVariableResponse() {}

  // parse attachment from iobuf
  int Parse(Source* source) override;
  int Parse(const butil::IOBuf& iobuf, const sendrecv::VariableMessage& meta) {
    BRPCSourceWrapper wrapper(iobuf);
    return VariableResponse::Parse(&wrapper, meta);
  }
};

};  // namespace distributed
};  // namespace operators
};  // namespace paddle