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/*
* ***** BEGIN LICENSE BLOCK *****
* Version: MIT
*
* Portions created by Alan Antonuk are Copyright (c) 2017 Alan Antonuk.
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
* ***** END LICENSE BLOCK *****
*/
#include <amqp.h>
#include <amqp_tcp_socket.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static void print_rpc_reply(amqp_rpc_reply_t r, const char* context);
int main(void) {
const char* QUEUE_NAME = "hello";
const char* MESSAGE = "Hello World!";
amqp_connection_state_t conn;
amqp_socket_t *socket;
amqp_channel_t chan;
int res;
amqp_rpc_reply_t reply;
conn = amqp_new_connection();
if (!conn) {
fprintf(stderr, "failed to allocate connection object\n");
return 1;
}
/* socket is owned by the conn object, its lifetime is managed by conn */
socket = amqp_tcp_socket_new(conn);
if (!socket) {
fprintf(stderr, "failed to allocate socket object\n");
res = 1;
goto cleanup1;
}
res = amqp_socket_open(socket, "localhost", AMQP_PROTOCOL_PORT);
if (res != AMQP_STATUS_OK) {
fprintf(stderr, "failed to connect to the broker: %s\n",
amqp_error_string2(res));
res = 2;
goto cleanup1;
}
reply =
amqp_login(conn, AMQP_DEFAULT_VHOST, AMQP_DEFAULT_MAX_CHANNELS,
AMQP_DEFAULT_FRAME_SIZE, AMQP_DEFAULT_HEARTBEAT,
AMQP_SASL_METHOD_PLAIN,
"guest", /* default guest account */
"guest" /* default guest password */);
if (reply.reply_type != AMQP_RESPONSE_NORMAL) {
print_rpc_reply(reply, "failed to complete handshake with broker");
res = 3;
goto cleanup1;
}
/* Channel numbers are any arbitrary number between 1 and the maximum
* number of channels requested. AMQP_DEFAULT_MAX_CHANNELS requests 2^16-1
* channels. A good method to select channel numbers is to start at 1 and
* go up from there, once a channel has been close (amqp_channel_close) it can
* be reused again.
*/
chan = 1;
/* rabbitmq-c that return a pointer to a struct indicate failure by returning
* NULL. Details on the error can be retried by calling amqp_get_rpc_reply */
if (!amqp_channel_open(conn, chan)) {
/* TODO: print error information */
print_rpc_reply(amqp_get_rpc_reply(conn), "opening channel 1");
res = 4;
goto cleanup1;
}
{
/* Some functions return additional information in a struct. The queue
* struct below is owned by the conn object. It is released by calling
* amqp_maybe_release_buffers or when the whole connection object is
* released when amqp_destroy_connection is called.
*/
amqp_queue_declare_ok_t *queue = amqp_queue_declare(
conn, chan, amqp_cstring_bytes(QUEUE_NAME),
0, /* Not passive, actually declare the queue */
0, /* Not durable, won't survive broker restart */
0, /* Not exclusive to this connection, maybe used by connections */
0, /* Not automatically deleted upon disconnection */
amqp_empty_table);
if (!queue) {
/* TODO: AMQP_CHANNEL_CLOSE_METHOD can be recovered */
print_rpc_reply(amqp_get_rpc_reply(conn), "declaring queue");
res = 5;
goto cleanup1;
}
}
{
amqp_basic_properties_t props;
memset(&props, 0, sizeof(props));
props.content_type = amqp_cstring_bytes("text/plain");
/* props._flags is a bitmask indicating which header fields are set. */
props._flags |= AMQP_BASIC_CONTENT_TYPE_FLAG;
res = amqp_basic_publish(
conn, chan, amqp_empty_bytes, /* Use the default exchange */
amqp_cstring_bytes(QUEUE_NAME), /* routing key */
0, /* Not mandatory, no error if the message is not routed */
0, /* Not immediate, RabbitMQ does not support this */
&props, amqp_cstring_bytes(MESSAGE));
if (res != AMQP_STATUS_OK) {
fprintf(stderr, "failed to publish message: %s\n",
amqp_error_string2(res));
res = 6;
goto cleanup1;
}
}
printf(" [x] Sent '%s'\n", MESSAGE);
/* close the connection to the broker, this implicitly closes all channels,
* there is no need to explicitly close any channels when tearing down a
* connection */
reply = amqp_connection_close(conn, AMQP_REPLY_SUCCESS);
if (reply.reply_type != AMQP_RESPONSE_NORMAL) {
print_rpc_reply(reply, "closing connection");
res = 7;
goto cleanup1;
}
res = 0;
cleanup1:
amqp_destroy_connection(conn);
return res;
}
static void print_rpc_reply(amqp_rpc_reply_t r, const char* context) {
switch (r.reply_type) {
case AMQP_RESPONSE_NORMAL:
break;
case AMQP_RESPONSE_NONE:
fprintf(stderr, "%s: missing RPC reply type!\n", context);
break;
case AMQP_RESPONSE_LIBRARY_EXCEPTION:
fprintf(stderr, "%s: %s\n", context, amqp_error_string2(r.library_error));
break;
case AMQP_RESPONSE_SERVER_EXCEPTION:
switch (r.reply.id) {
case AMQP_CONNECTION_CLOSE_METHOD: {
amqp_connection_close_t *m =
(amqp_connection_close_t *)r.reply.decoded;
fprintf(stderr, "%s: connection exception %uh, message: %.*s\n",
context, m->reply_code, (int)m->reply_text.len,
(char *)m->reply_text.bytes);
break;
}
case AMQP_CHANNEL_CLOSE_METHOD: {
amqp_channel_close_t *m = (amqp_channel_close_t *)r.reply.decoded;
fprintf(stderr, "%s: channel exception %uh, message: %.*s\n", context,
m->reply_code, (int)m->reply_text.len,
(char *)m->reply_text.bytes);
break;
}
default:
fprintf(stderr, "%s: unknown broker error, method 0x%08X, %s\n",
context, r.reply.id, amqp_method_name(r.reply.id));
break;
}
break;
default:
fprintf(stderr, "%s: unknown reply-type: %d", context, r.reply_type);
}
}
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