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<?php
/* =====================================================================
* mdcliapi.h
*
* Majordomo Protocol Client API
* Implements the MDP/Worker spec at http://rfc.zeromq.org/spec:7.
* ---------------------------------------------------------------------
* Copyright (c) 1991-2011 iMatix Corporation <www.imatix.com>
* Copyright other contributors as noted in the AUTHORS file.
*
* This file is part of the ZeroMQ Guide: http://zguide.zeromq.org
*
* This is free software; you can redistribute it and/or modify it under
* the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 3 of the License, or (at
* your option) any later version.
*
* This software is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/>.
* =====================================================================
*
* @author Ian Barber <ian(dot)barber(at)gmail(dot)com>
*/
include_once "zmsg.php";
include_once "mdp.php";
class MDCli {
// Structure of our class
// We access these properties only via class methods
private $broker;
private $context;
private $client; // Socket to broker
private $verbose; // Print activity to stdout
private $timeout; // Request timeout
private $retries; // Request retries
/**
* Constructor
*
* @param string $broker
* @param boolean $verbose
*/
public function __construct($broker, $verbose = false) {
$this->broker = $broker;
$this->context = new ZMQContext();
$this->verbose = $verbose;
$this->timeout = 2500; // msecs
$this->retries = 3; // Before we abandon
$this->connect_to_broker();
}
/**
* Connect or reconnect to broker
*/
protected function connect_to_broker() {
if($this->client) {
unset($this->client);
}
$this->client = new ZMQSocket($this->context, ZMQ::SOCKET_REQ);
$this->client->setSockOpt(ZMQ::SOCKOPT_LINGER, 0);
$this->client->connect($this->broker);
if($this->verbose) {
printf("I: connecting to broker at %s...", $this->broker);
}
}
/**
* Set request timeout
*
* @param int $timeout (msecs)
*/
public function set_timeout($timeout) {
$this->timeout = $timeout;
}
/**
* Set request retries
*
* @param int $retries
*/
public function set_retries($retries) {
$this->retries = $retries;
}
/**
* Send request to broker and get reply by hook or crook
* Takes ownership of request message and destroys it when sent.
* Returns the reply message or NULL if there was no reply.
*
* @param string $service
* @param Zmsg $request
* @param string $client
* @return Zmsg
*/
public function send($service, Zmsg $request) {
// Prefix request with protocol frames
// Frame 1: "MDPCxy" (six bytes, MDP/Client
// Frame 2: Service name (printable string)
$request->push($service);
$request->push(MDPC_CLIENT);
if ($this->verbose) {
printf ("I: send request to '%s' service:", $service);
echo $request->__toString();
}
$retries_left = $this->retries;
$read = $write = array();
while($retries_left) {
$request->set_socket($this->client)->send();
// Poll socket for a reply, with timeout
$poll = new ZMQPoll();
$poll->add($this->client, ZMQ::POLL_IN);
$events = $poll->poll($read, $write, $this->timeout);
// If we got a reply, process it
if($events) {
$request->recv();
if ($this->verbose) {
echo "I: received reply:", $request->__toString(), PHP_EOL;
}
// Don't try to handle errors, just assert noisily
assert ($request->parts() >= 3);
$header = $request->pop();
assert($header == MDPC_CLIENT);
$reply_service = $request->pop();
assert($reply_service == $service);
return $request; // Success
} else if($retries_left--) {
if($this->verbose) {
echo "W: no reply, reconnecting...", PHP_EOL;
}
// Reconnect, and resend message
$this->connect_to_broker();
$request->send();
} else {
echo "W: permanent error, abandoning request", PHP_EOL;
break; // Give up
}
}
}
}
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