5、Topics

http://previous.rabbitmq.com/v3_5_7/tutorials/tutorial-five-php.html

Topic exchange

• *（星号）可以替代一个单词。

• ＃（hash）可以替换零个或多个单词。

要接收所有日志：

$ php receive_logs_topic.php "#"

To receive all logs from the facility "kern":

$ phpreceive_logs_topic.php "kern.*"

Or if you want to hear only about "critical" logs:

$ php receive_logs_topic.php "*.critical"

You can create multiple bindings:

$ php receive_logs_topic.php "kern." ".critical"

And to emit a log with a routing key "kern.critical" type:

$ php emit_log_topic.php "kern.critical" "A critical kernel error"

The code for emit_log_topic.php:

<?php

require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;

$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();

$channel->exchange_declare('topic_logs', 'topic', false, false, false);

$routing_key = $argv[1];
if(empty($routing_key)) $routing_key = "anonymous.info";
$data = implode(' ', array_slice($argv, 2));
if(empty($data)) $data = "Hello World!";

$msg = new AMQPMessage($data);

$channel->basic_publish($msg, 'topic_logs', $routing_key);

echo " [x] Sent ",$routing_key,':',$data," \n";

$channel->close();
$connection->close();

?>

The code for receive_logs_topic.php:

<?php

require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;

$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();

$channel->exchange_declare('topic_logs', 'topic', false, false, false);

list($queue_name, ,) = $channel->queue_declare("", false, false, true, false);

$binding_keys = array_slice($argv, 1);
if( empty($binding_keys )) {
    file_put_contents('php://stderr', "Usage: $argv[0] [binding_key]\n");
    exit(1);
}

foreach($binding_keys as $binding_key) {
    $channel->queue_bind($queue_name, 'topic_logs', $binding_key);
}

echo ' [*] Waiting for logs. To exit press CTRL+C', "\n";

$callback = function($msg){
  echo ' [x] ',$msg->delivery_info['routing_key'], ':', $msg->body, "\n";
};

$channel->basic_consume($queue_name, '', false, true, false, false, $callback);

while(count($channel->callbacks)) {
    $channel->wait();
}

$channel->close();
$connection->close();

?>