protected function onPoll($events, $read, $write)
{
parent::onPoll($events, $read, $write);
if ($events > 0) {
foreach ($read as $socket) {
//handle publisher
if ($socket === $this->frontedSocket) {
$zmsg = new Zmsg($this->frontedSocket);
$zmsg->recv();
if ($this->verbose) {
echo "I: received message from publisher size: ";
echo strlen($zmsg->__toString()), PHP_EOL;
}
$zmsg->unwrap();
//time
if ($this->queueLimit > sizeof($this->queue)) {
array_unshift($this->queue, $zmsg->pop());
}
}
}
}
}
/**
* Start listen for messages in loop
* @throws \Exception
*/
public function listen()
{
if (!$this->listener) {
throw new \Exception("Empty listener");
}
$this->isListen = true;
while ($this->isListen) {
$zmsg = new Zmsg($this->socket);
$zmsg->recv();
if ($this->verbose) {
echo "I: received message from broker:", PHP_EOL;
echo $zmsg->__toString(), PHP_EOL;
}
$time = $zmsg->unwrap();
if (!$this->normalDelay) {
$this->normalDelay = microtime(true) * 1000 - (double) $time;
}
$delayTime = microtime(true) * 1000 - (double) $time;
if ($this->misser && $delayTime > $this->normalDelay + $this->maxAllowedDelay) {
call_user_func($this->misser, $zmsg->pop(), $time, $delayTime);
}
call_user_func($this->listener, $zmsg->pop(), $time);
}
}
$events = 0;
// If we have no workers anyhow, wait indefinitely
try {
$events = $poll->poll($readable, $writeable, $local_capacity ? 1000000 : -1);
} catch (ZMQPollException $e) {
break;
}
// Track if capacity changes during this iteration
$previous = $local_capacity;
foreach ($readable as $socket) {
$zmsg = new Zmsg($socket);
// Handle reply from local worker
if ($socket === $localbe) {
// Use worker address for LRU routing
$zmsg->recv();
$worker_queue[] = $zmsg->unwrap();
$local_capacity++;
if ($zmsg->body() == "READY") {
$zmsg = null;
// Don't route it
}
} else {
if ($socket === $cloudbe) {
// We don't use peer broker address for anything
$zmsg->recv()->unwrap();
} else {
if ($socket === $statefe) {
$zmsg->recv();
$cloud_capacity = $zmsg->body();
$zmsg = null;
} else {
while (true) {
$poll = new ZMQPoll();
$poll->add($backend, ZMQ::POLL_IN);
// Poll frontend only if we have available workers
if ($available_workers) {
$poll->add($frontend, ZMQ::POLL_IN);
}
$events = $poll->poll($read, $write);
foreach ($read as $socket) {
$zmsg = new Zmsg($socket);
$zmsg->recv();
// Handle worker activity on backend
if ($socket === $backend) {
// Use worker address for LRU routing
assert($available_workers < MAX_WORKERS);
array_push($worker_queue, $zmsg->unwrap());
$available_workers++;
// Return reply to client if it's not a READY
if ($zmsg->address() != "READY") {
$zmsg->set_socket($frontend)->send();
}
} elseif ($socket === $frontend) {
// Now get next client request, route to next worker
// REQ socket in worker needs an envelope delimiter
// Dequeue and drop the next worker address
$zmsg->wrap(array_shift($worker_queue), "");
$zmsg->set_socket($backend)->send();
$available_workers--;
}
}
// We never exit the main loop
/**
* Run a self test of the Zmsg class.
*
* @return boolean
* @todo See if assert returns
*/
public static function test()
{
$result = true;
$context = new ZMQContext();
$output = new ZMQSocket($context, ZMQ::SOCKET_XREQ);
$output->bind("inproc://zmsg_selftest");
$input = new ZMQSocket($context, ZMQ::SOCKET_XREP);
$input->connect("inproc://zmsg_selftest");
// Test send and receive of single-part message
$zmsgo = new Zmsg($output);
$zmsgo->body_set("Hello");
$result &= assert($zmsgo->body() == "Hello");
$zmsgo->send();
$zmsgi = new Zmsg($input);
$zmsgi->recv();
$result &= assert($zmsgi->parts() == 2);
$result &= assert($zmsgi->body() == "Hello");
echo $zmsgi;
// Test send and receive of multi-part message
$zmsgo = new Zmsg($output);
$zmsgo->body_set("Hello");
$zmsgo->wrap("address1", "");
$zmsgo->wrap("address2");
$result &= assert($zmsgo->parts() == 4);
echo $zmsgo;
$zmsgo->send();
$zmsgi = new Zmsg($input);
$zmsgi->recv();
$result &= assert($zmsgi->parts() == 5);
$zmsgi->unwrap();
$result &= assert($zmsgi->unwrap() == "address2");
$zmsgi->body_fmt("%s%s", 'W', "orld");
$result &= assert($zmsgi->body() == "World");
// Pull off address 1, check that empty part was dropped
$zmsgi->unwrap();
$result &= assert($zmsgi->parts() == 1);
// Check that message body was correctly modified
$part = $zmsgi->pop();
$result &= assert($part == "World");
$result &= assert($zmsgi->parts() == 0);
// Test load and save
$zmsg = new Zmsg();
$zmsg->body_set("Hello");
$zmsg->wrap("address1", "");
$zmsg->wrap("address2");
$result &= assert($zmsg->parts() == 4);
$fh = fopen(sys_get_temp_dir() . "/zmsgtest.zmsg", 'w');
$zmsg->save($fh);
fclose($fh);
$fh = fopen(sys_get_temp_dir() . "/zmsgtest.zmsg", 'r');
$zmsg2 = new Zmsg();
$zmsg2->load($fh);
assert($zmsg2->last() == $zmsg->last());
fclose($fh);
$result &= assert($zmsg2->parts() == 4);
echo $result ? "OK" : "FAIL", PHP_EOL;
return $result;
}
/**
* Send reply, if any, to broker and wait for next request.
*
* @param Zmsg $reply
* @return Zmsg Returns if there is a request to process
*/
public function recv($reply = null)
{
// Format and send the reply if we were provided one
assert($reply || !$this->expect_reply);
if ($reply) {
$reply->wrap($this->reply_to);
$this->send_to_broker(MDPW_REPLY, NULL, $reply);
}
$this->expect_reply = true;
$read = $write = array();
while (true) {
$poll = new ZMQPoll();
$poll->add($this->worker, ZMQ::POLL_IN);
$events = $poll->poll($read, $write, $this->heartbeat);
if ($events) {
$zmsg = new Zmsg($this->worker);
$zmsg->recv();
if ($this->verbose) {
echo "I: received message from broker:", PHP_EOL;
echo $zmsg->__toString();
}
$this->liveness = HEARTBEAT_LIVENESS;
// Don't try to handle errors, just assert noisily
assert($zmsg->parts() >= 3);
$zmsg->pop();
$header = $zmsg->pop();
assert($header == MDPW_WORKER);
$command = $zmsg->pop();
if ($command == MDPW_REQUEST) {
// We should pop and save as many addresses as there are
// up to a null part, but for now, just save one...
$this->reply_to = $zmsg->unwrap();
return $zmsg;
// We have a request to process
} else {
if ($command == MDPW_HEARTBEAT) {
// Do nothing for heartbeats
} else {
if ($command == MDPW_DISCONNECT) {
$this->connect_to_broker();
} else {
echo "E: invalid input message", PHP_EOL;
echo $zmsg->__toString();
}
}
}
} else {
if (--$this->liveness == 0) {
// poll ended on timeout, $event being false
if ($this->verbose) {
echo "W: disconnected from broker - retrying...", PHP_EOL;
}
usleep($this->reconnect * 1000);
$this->connect_to_broker();
}
}
// Send HEARTBEAT if it's time
if (microtime(true) > $this->heartbeat_at) {
$this->send_to_broker(MDPW_HEARTBEAT, NULL, NULL);
$this->heartbeat_at = microtime(true) + $this->heartbeat / 1000;
}
}
}
/**
* Process message sent to us by a worker
*
* @param string $sender
* @param Zmsg $msg
*/
public function worker_process($sender, $msg)
{
$command = $msg->pop();
$worker_ready = isset($this->workers[$sender]);
$worker = $this->worker_require($sender);
if ($command == MDPW_READY) {
if ($worker_ready) {
$this->worker_delete($worker, true);
// Not first command in session
} else {
if (strlen($sender) >= 4 && substr($sender, 0, 4) == 'mmi.') {
$this->worker_delete($worker, true);
} else {
// Attach worker to service and mark as idle
$service_frame = $msg->pop();
$worker->service = $this->service_require($service_frame);
$worker->service->workers++;
$this->worker_waiting($worker);
}
}
} else {
if ($command == MDPW_REPLY) {
if ($worker_ready) {
// Remove & save client return envelope and insert the
// protocol header and service name, then rewrap envelope.
$client = $msg->unwrap();
$msg->push($worker->service->name);
$msg->push(MDPC_CLIENT);
$msg->wrap($client, "");
$msg->set_socket($this->socket)->send();
$this->worker_waiting($worker);
} else {
$this->worker_delete($worker, true);
}
} else {
if ($command == MDPW_HEARTBEAT) {
if ($worker_ready) {
$worker->expiry = microtime(true) + HEARTBEAT_EXPIRY / 1000;
} else {
$this->worker_delete($worker, true);
}
} else {
if ($command == MDPW_DISCONNECT) {
$this->worker_delete($worker, true);
} else {
echo "E: invalid input message", PHP_EOL, $msg->__toString();
}
}
}
}
}
function main()
{
for ($client_nbr = 0; $client_nbr < NBR_CLIENTS; $client_nbr++) {
$pid = pcntl_fork();
if ($pid == 0) {
client_thread();
return;
}
}
for ($worker_nbr = 0; $worker_nbr < NBR_WORKERS; $worker_nbr++) {
$pid = pcntl_fork();
if ($pid == 0) {
worker_thread();
return;
}
}
$context = new ZMQContext();
$frontend = new ZMQSocket($context, ZMQ::SOCKET_ROUTER);
$backend = new ZMQSocket($context, ZMQ::SOCKET_ROUTER);
$frontend->bind("ipc://frontend.ipc");
$backend->bind("ipc://backend.ipc");
// Logic of LRU loop
// - Poll backend always, frontend only if 1+ worker ready
// - If worker replies, queue worker as ready and forward reply
// to client if necessary
// - If client requests, pop next worker and send request to it
// Queue of available workers
$available_workers = 0;
$worker_queue = array();
$writeable = $readable = array();
while ($client_nbr > 0) {
$poll = new ZMQPoll();
// Poll front-end only if we have available workers
if ($available_workers > 0) {
$poll->add($frontend, ZMQ::POLL_IN);
}
// Always poll for worker activity on backend
$poll->add($backend, ZMQ::POLL_IN);
$events = $poll->poll($readable, $writeable);
if ($events > 0) {
foreach ($readable as $socket) {
// Handle worker activity on backend
if ($socket === $backend) {
// Queue worker address for LRU routing
$zmsg = new Zmsg($socket);
$zmsg->recv();
assert($available_workers < NBR_WORKERS);
$available_workers++;
array_push($worker_queue, $zmsg->unwrap());
if ($zmsg->body() != "READY") {
$zmsg->set_socket($frontend)->send();
// exit after all messages relayed
$client_nbr--;
}
} else {
if ($socket === $frontend) {
$zmsg = new Zmsg($socket);
$zmsg->recv();
$zmsg->wrap(array_shift($worker_queue), "");
$zmsg->set_socket($backend)->send();
$available_workers--;
}
}
}
}
}
// Clean up our worker processes
foreach ($worker_queue as $worker) {
$zmsg = new Zmsg($backend);
$zmsg->body_set('END')->wrap($worker, "")->send();
}
sleep(1);
}
while (true) {
$poll = new ZMQPoll();
$poll->add($backend, ZMQ::POLL_IN);
// Poll frontend only if we have available workers
if ($queue->size()) {
$poll->add($frontend, ZMQ::POLL_IN);
}
$events = $poll->poll($read, $write, HEARTBEAT_INTERVAL * 1000 * 1000);
// microseconds
if ($events > 0) {
foreach ($read as $socket) {
$zmsg = new Zmsg($socket);
$zmsg->recv();
// Handle worker activity on backend
if ($socket === $backend) {
$identity = $zmsg->unwrap();
// Return reply to client if it's not a control message
if ($zmsg->parts() == 1) {
if ($zmsg->address() == "READY") {
$queue->s_worker_delete($identity);
$queue->s_worker_append($identity);
} else {
if ($zmsg->address() == 'HEARTBEAT') {
$queue->s_worker_refresh($identity);
} else {
printf("E: invalid message from %s%s%s", $identity, PHP_EOL, $zmsg->__toString());
}
}
} else {
$zmsg->set_socket($frontend)->send();
$queue->s_worker_append($identity);