rdb_transceiver_tcp.hpp

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/*
 * Copyright 2020 Robert Bosch GmbH
 *
 * 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.
 *
 * SPDX-License-Identifier: Apache-2.0
 */
#pragma once
 
#include <memory>  // for shared_ptr<>
#include <string>  // for string
#include <vector>  // for vector<>
 
#include <boost/asio.hpp>  // for streamsize
 
#include <cloe/core.hpp>                     // for Json
#include <cloe/utility/tcp_transceiver.hpp>  // for TcpTransceiver
 
#include "rdb_transceiver.hpp"  // for RdbTransceiver
#include "vtd_logger.hpp"       // for rdb_logger
 
#define VTD_RDB_WAIT_SLEEP_MS 1
 
namespace vtd {
 
class RdbTransceiverTcp : public RdbTransceiver, public cloe::utility::TcpTransceiver {
 public:
  using TcpTransceiver::TcpTransceiver;
 
  bool has() const override {
    return this->tcp_available_data() >= static_cast<std::streamsize>(sizeof(RDB_MSG_HDR_t));
  }
 
  std::vector<std::shared_ptr<RDB_MSG_t>> receive() override {
    std::vector<std::shared_ptr<RDB_MSG_t>> msgs;
    while (!this->has()) {
      std::this_thread::sleep_for(cloe::Milliseconds{VTD_RDB_WAIT_SLEEP_MS});
    }
    while (this->has()) {
      num_received_++;
      msgs.push_back(this->receive_wait());
    }
    return msgs;
  }
 
  void send(const RDB_MSG_t* message, size_t size) override {
    num_sent_++;
    this->tcp_send(message, size);
  }
 
  void to_json(cloe::Json& j) const override {
    j = cloe::Json{
        {"connection_endpoint", this->tcp_endpoint()},
        {"connection_ok", this->tcp_is_ok()},
        {"num_errors", this->num_errors_},
        {"num_messages_sent", this->num_sent_},
        {"num_messages_received", this->num_received_},
    };
  }
 
  friend void to_json(cloe::Json& j, const RdbTransceiverTcp& t) { t.to_json(j); }
 
 protected:
  std::shared_ptr<RDB_MSG_t> receive_wait();
 
 private:
  // Statistics for interest's sake
  uint64_t num_errors_{0};
  uint64_t num_sent_{0};
  uint64_t num_received_{0};
};
 
class RdbTransceiverTcpFactory : public cloe::utility::TcpTransceiverFactory<RdbTransceiverTcp> {
 public:
  using TcpTransceiverFactory::TcpTransceiverFactory;
 
 protected:
  cloe::Logger factory_logger() const override { return rdb_logger(); }
  const char* instance_name() const override { return "RdbTransceiverTcp"; }
};
 
}  // namespace vtd