receive_logs_topic.cpp

#include <iostream>
#include <string.h>
#include <algorithm>
#include <thread>
#include <chrono>

#include <amqp.h>
#include <amqp_tcp_socket.h>

int main(int argc, char const *const *argv)
{

  amqp_connection_state_t conn = amqp_new_connection();
  amqp_socket_t *socket = amqp_tcp_socket_new(conn);
  amqp_socket_open(socket, "localhost", AMQP_PROTOCOL_PORT);

  amqp_login(conn, "/", 0, AMQP_DEFAULT_FRAME_SIZE, 0, AMQP_SASL_METHOD_PLAIN, "guest", "guest");
  const amqp_channel_t KChannel = 1;
  amqp_channel_open(conn, KChannel);

  amqp_bytes_t exchangeName(amqp_cstring_bytes("topic_logs"));
  amqp_exchange_declare(conn, KChannel, exchangeName, amqp_cstring_bytes("topic"),
                        false, false, false, false, amqp_empty_table);

  amqp_queue_declare_ok_t *r = amqp_queue_declare(conn, KChannel, amqp_empty_bytes, false, false, /*exclusive*/ true, false, amqp_empty_table);
  amqp_bytes_t queueName = amqp_bytes_malloc_dup(r->queue);

  if (argc > 1)
  {
    for (int i = 1; i < argc; ++i)
      amqp_queue_bind(conn, KChannel, queueName, exchangeName, amqp_cstring_bytes(argv[i]), amqp_empty_table);
  }
  else
  {
    std::cout << "Usage: " << argv[0] << " [binding_key] ..." << std::endl;
    return 1;
  }

  std::cout << "[*] Waiting for logs. To exit press CTRL+C'" << std::endl;
  amqp_basic_consume(conn, KChannel, queueName, amqp_empty_bytes, false, /* auto ack*/ true, false, amqp_empty_table);

  for (;;)
  {
    amqp_maybe_release_buffers(conn);
    amqp_envelope_t envelope;
    amqp_consume_message(conn, &envelope, nullptr, 0);

    std::string message((char *)envelope.message.body.bytes, (int)envelope.message.body.len);
    std::cout << " [x] Received " << std::string((char*)envelope.routing_key.bytes, (int)envelope.routing_key.len) << ":" << message << std::endl;

    amqp_destroy_envelope(&envelope);
  }

  amqp_bytes_free(queueName);
  amqp_channel_close(conn, KChannel, AMQP_REPLY_SUCCESS);
  amqp_connection_close(conn, AMQP_REPLY_SUCCESS);
  amqp_destroy_connection(conn);

  return 0;
}