12. Setting up a server with Ratchet
<?php
use RatchetMessageComponentInterface;
use RatchetConnectionInterface;
class Handler implements MessageComponentInterface {
public function onOpen(ConnectionInterface $conn) {}
public function onMessage(ConnectionInterface $from, $msg) {}
public function onClose(ConnectionInterface $conn) {}
public function onError(ConnectionInterface $conn, Exception $e) {}
}
13. Setting up a server with Ratchet
<?php
use RatchetServerIoServer;
use RatchetHttpHttpServer;
use RatchetWebSocketWsServer;
$handler = new AppHandler();
$server = IoServer::factory(
new HttpServer(new WsServer(
$handler
)
), 8123);
$server->run();
14. In the browser
var ws = new WebSocket('ws://127.0.0.1:8123');
// ... in some event
ws.send('Гледай кви ръки, чуек!');
// ... listener for messages:
ws.onmessage = function (message) {
alert(message);
};
16. What do we need?
✔ Keep all active connection objects
✔ When a connection sends a message, notify all
others
✔ On disconnect – remove connection object from
the in-memory cache (map)
17. Connections handling
<?php
class Handler implements MessageComponentInterface {
private $connections = [];
public function onOpen(ConnectionInterface $conn) {
$this->connections[$conn->resourceId] = $conn;
}
public function onMessage(ConnectionInterface $from, $msg) {
foreach ($this->connections as $receiver) {
$receiver->send($msg);
}
}
public function onClose(ConnectionInterface $conn) {
unset($this->connections[$conn->resourceId]);
}
}
19. Keep an eye on:
✔ Run it like a daemon (/etc/init.d/skeleton)
✔ Fatal errors and exceptions – they kill the
daemon
✔ ORMs like Doctrine help you a lot
28. ZeroMQ
✔ Libzmq
✔ Has a PHP extension in PECL
✔ React/ZMQ (PHP wrapper)
✔ "react/zmq": "0.2.*|0.3.*" in Composer
29. What you need to know
✔ There are ZeroMQ listeners
– They use simple TCP
✔ There are ZeroMQ contexts (senders)
– They connect to ZeroMQ listeners and send
messages
30. What you need to know
✔ You need ZeroMQ listener in the WebSocket
daemon
✔ Ordinary PHP scripts send messages to the
listener
✔ Since ZeroMQ is in the WebSocket daemon, it
could easily interact with WebSocket
connections
32. Add callback for ZeroMQ messages
<?php
class Handler implements MessageComponentInterface
{
// ...
// this is CUSTOM method (not from interface)
public function onZMQMessage($message)
{
}
}
33. Add ZeroMQ listener to the daemon
<?php
use ...
$handler = new AppHandler();
$server = IoServer::factory(
new HttpServer(new WsServer(
$handler
)
), 8123);
// Listen on 127.0.0.1:4444
$context = new ReactZMQContext($server->loop);
$pull = $context->getSocket(ZMQ::SOCKET_PULL);
$pull->bind("tcp://127.0.0.1:4444");
$pull->on('message', function ($data) use ($handler) {
$handler->onZMQMessage($data);
});
$server->run();
34. In your Ajax server script
<?php
// ... add stuff to the database, other things...
// notify using ZeroMQ:
$context = new ZMQContext();
$socket = $context->getSocket(ZMQ::SOCKET_PUSH, 'pusher');
$socket->connect("tcp://127.0.0.1:4444");
$socket->send('Глей кви ръки! Туй аз ли съм!?');