added example 6 rpc client/server

php-amqp/rpc_client.php

@@ -0,0 +1,109 @@
+#!/usr/bin/env php
+<?php
+/**
+ rpc_client.php 
+ @author: Chimdi Azubuike <[email protected]>
+ */
+
+class FibonacciRpcClient {
+	private $connection;
+	private $channel;
+
+	private $callbackQueueName;
+	private $queueName = 'rpc_queue';
+	private $rpcQueue = 'rpc_queue';
+
+
+	private $response;
+
+	protected $queue;
+	protected $corrId;
+
+	public function __construct() {	
+		$this->connection = $this->getAMQPConnection();		
+		$this->setChannel();
+		$this->setExchange();
+	}
+
+	/**
+	 AMQP Connection
+	 */
+	protected function getAMQPConnection() {
+		$connection = new AMQPConnection();
+		$connection->setHost('127.0.0.1');
+		$connection->setLogin('guest');
+		$connection->setPassword('guest');
+		$connection->connect();
+		return $connection;
+	}
+
+	/**
+	 Declare Channel
+	 */
+	protected function setChannel() {
+		$this->channel = new AMQPChannel($this->connection);
+		$this->channel->setPrefetchCount(1);	
+	}
+
+	/**
+	 Declare Exchange
+	 */
+	protected function setExchange() {	
+		$this->exchange = new AMQPExchange($this->channel);
+	}
+
+	public function on_response(AMQPEnvelope $message, AMQPQueue $queue) {
+		print_r(func_get_args());	
+	}
+
+	public function call($value) {
+		$this->response = NULL;
+		$this->corrId = uniqid();
+
+		try {
+			//Declare an nonymous channel
+			$this->queue = new AMQPQueue($this->channel);
+			$this->queue->setFlags(AMQP_EXCLUSIVE);
+			$this->queue->declareQueue();	
+			$this->callbackQueueName = $this->queue->getName();
+
+			//Set Publish Attributes
+			$attributes = array(
+				'correlation_id' => $this->corrId,
+				'reply_to' 		 =>	$this->callbackQueueName
+			);
+
+			$this->exchange->publish(
+				$value,
+				$this->rpcQueue,
+				AMQP_NOPARAM,
+				$attributes
+			);
+
+			$callback = function(AMQPEnvelope $message, AMQPQueue $q) {
+				if($message->getCorrelationId() == $this->corrId) {
+					//echo sprintf("CorrelationID: %s",$message->getCorrelationId()), PHP_EOL; 
+					//echo sprintf("Response: %s",$message->getBody()), PHP_EOL; 
+					$this->response = $message->getBody();
+					$q->nack($message->getDeliveryTag());
+					return false;
+				}	
+			};	
+
+			$this->queue->consume($callback);
+
+			//Return RPC Results
+			return $this->response;
+		} catch(AMQPQueueException $ex) {
+			print_r($ex);
+		} catch(Exception $ex) {
+			print_r($ex);
+		}
+	}
+}
+
+$value = (isset($argv[1]))? $argv[1] : 5;
+$fibonacciRpc = new FibonacciRpcClient();
+echo sprintf(" [x] Requesting fib(%s)",$value), PHP_EOL;
+$response = $fibonacciRpc->call($value);
+echo sprintf(" [.] Received: %s",$response), PHP_EOL;

php-amqp/rpc_server.php

@@ -0,0 +1,88 @@
+#!/usr/bin/env php
+<?php
+/**
+ rpc_server.php 
+ @author: Chimdi Azubuike <[email protected]>
+ */
+
+function fib($n) {
+	if($n == 0)
+		return 0;
+	if($n == 1)
+		return 1;
+	return fib($n - 1) + fib($n - 2);
+}
+
+function fast_fib($n) {
+	if ($n < 0)
+		throw new Exception('Negative number not implemented');
+	else
+		return fast_fib_calc($n)[0];	
+}
+
+
+function fast_fib_calc($n) {
+	if ($n == 0)
+		return array(0, 1);
+	else {
+		list($a,$b) = fast_fib_calc(floor($n/2));
+		$c = $a * ($b * 2 - $a);
+		$d = $a * $a + $b * $b;
+		if (($n % 2) == 0)
+			return array($c, $d);
+		else
+			return array($d, $c + $d);
+	}
+}
+
+//Establish connection to AMQP
+$connection = new AMQPConnection();
+$connection->setHost('127.0.0.1');
+$connection->setLogin('guest');
+$connection->setPassword('guest');
+$connection->connect();
+
+
+//Declare Channel
+$channel = new AMQPChannel($connection);
+$channel->setPrefetchCount(1);
+
+$exchange = new AMQPExchange($channel);
+
+$queueName = 'rpc_queue';
+$queue = new AMQPQueue($channel);
+$queue->setName($queueName);
+$queue->declareQueue();
+
+
+
+echo " [x] Awaiting RPC requests", PHP_EOL;
+$callback_func = function(AMQPEnvelope $message, AMQPQueue $q) use (&$exchange) {
+	$n = intval($message->getBody());
+	echo " [.] fib({$n})", PHP_EOL;
+
+	$attributes = array(
+		'correlation_id' => $message->getCorrelationId()
+	);
+
+	echo sprintf(" QueueName: %s", $q->getName()), PHP_EOL;
+	echo sprintf(" ReplyTo: %s", $message->getReplyTo()), PHP_EOL;
+	echo sprintf(" CorrelationID: %s", $message->getCorrelationId()), PHP_EOL;
+
+	$exchange->publish(	(string)fast_fib($n),
+						$message->getReplyTo(), 
+						AMQP_NOPARAM,
+						$attributes
+	);
+
+	$q->nack($message->getDeliveryTag());
+};
+
+
+try {
+	$queue->consume($callback_func);
+} catch(AMQPQueueException $ex) {
+	print_r($ex);
+} catch(Exception $ex) {
+	print_r($ex);
+}