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|
<?php
namespace jobd;
class Client {
const WORKER_PORT = 7080;
const MASTER_PORT = 7081;
const EOT = "\4";
const REQUEST_NO_LIMIT = 999999;
protected $host;
protected $port;
protected $password;
protected $sock;
protected $passwordSent = false;
protected $lastOutgoingRequestNo = null;
/**
* JobdClient constructor.
* @param int $port
* @param string $host
* @param string $password
* @throws \Exception
*/
public function __construct(int $port, string $host = '127.0.0.1', string $password = '') {
$this->port = $port;
$this->host = $host;
$this->password = $password;
$this->sock = fsockopen($this->host, $this->port);
if (!$this->sock)
throw new \Exception("Failed to connect to {$this->host}:{$this->port}");
// 0 is reserved
$this->lastOutgoingRequestNo = mt_rand(1, self::REQUEST_NO_LIMIT);
}
/**
* JobdClient destructor.
*/
public function __destruct() {
$this->close();
}
/**
* @return ResponseMessage
* @throws \Exception
*/
public function ping() {
$this->send(new PingMessage());
return $this->recv();
}
/**
* @param RequestMessage $request
* @return int
*/
public function sendRequest(RequestMessage $request) {
if ($this->password && !$this->passwordSent) {
$request->setPassword($this->password);
$this->passwordSent = true;
}
$no = $this->getNextOutgoingRequestNo();
$request->setRequestNo($no);
$this->send($request);
return $no;
}
/**
* @param Message $message
*/
public function send(Message $message) {
$serialized = $message->serialize();
fwrite($this->sock, $serialized . self::EOT);
}
/**
* @param int $request_no
* @return ResponseMessage
* @throws \Exception
*/
public function recv(int $request_no = -1) {
$messages = [];
$buf = '';
while (!feof($this->sock)) {
$buf .= fread($this->sock, 1024);
$buflen = strlen($buf);
if ($buflen > 0 && $buf[$buflen-1] == self::EOT)
break;
}
$offset = 0;
$eot_pos = 0;
do {
$eot_pos = strpos($buf, self::EOT, $offset);
if ($eot_pos !== false) {
$message = substr($buf, $offset, $eot_pos);
$messages[] = $message;
$offset = $eot_pos + 1;
}
} while ($eot_pos !== false && $offset < $buflen-1);
if (empty($messages))
throw new \Exception("Malformed response: no messages found. Response: {$buf}");
if (count($messages) > 1)
trigger_error(__METHOD__.": received more than one message");
$response = null;
$messages = array_map('self::parseMessage', $messages);
if ($request_no != -1) {
/**
* @var ResponseMessage[] $messages
*/
$messages = array_filter(
$messages,
/**
* @param ResponseMessage|RequestMessage $message
*/
function(Message $message) use ($request_no) {
return $message instanceof ResponseMessage
&& ($message->getRequestNo() === $request_no || $message->getRequestNo() === 0);
}
);
if (empty($messages))
throw new \Exception("Malformed response: response for {$request_no} not found.");
if (count($messages) == 2) {
// weird, we caught response for our $request_no AND a message with reserved zero no
// but anyway
for ($i = 0; $i < count($messages); $i++) {
$message = $messages[$i];
if ($message->getRequestNo() == $request_no)
$response = $message;
else if ($message->getRequestNo() == 0)
trigger_error(__METHOD__.': received an error with reqno=0: '.($message->getError() ?? null));
}
}
}
if (is_null($response))
$response = $messages[0];
if ($response instanceof ResponseMessage) {
if ($error = $response->getError())
throw new \Exception($response->getError());
}
return $response;
}
/**
* @return int
*/
protected function getNextOutgoingRequestNo() {
$this->lastOutgoingRequestNo++;
if ($this->lastOutgoingRequestNo >= self::REQUEST_NO_LIMIT)
$this->lastOutgoingRequestNo = 1; // 0 is reserved
return $this->lastOutgoingRequestNo;
}
/**
* @param string $raw_string
* @return RequestMessage|ResponseMessage
* @throws \Exception
*/
protected static function parseMessage(string $raw_string) {
$raw = json_decode($raw_string, true);
if (!is_array($raw) || count($raw) < 1)
throw new \Exception("Malformed message: {$raw_string}");
list($type) = $raw;
switch ($type) {
case Message::REQUEST:
$data = $raw[1];
try {
self::validateData($data, [
// name type required
['type', 's', true],
['no', 'i', true],
['password', 's', false],
['data', 'aifs', false]
]);
} catch (\Exception $e) {
throw new \Exception("Malformed REQUEST message: {$e->getMessage()}");
}
$message = new RequestMessage($data['type'], $data['data'] ?? null);
$message->setRequestNo($data['no']);
if (isset($data['password']))
$message->setPassword($data['password']);
return $message;
case Message::RESPONSE:
$data = $raw[1];
try {
self::validateData($data, [
// name type required
['no', 'i', true],
['data', 'aifs', false],
['error', 's', false],
]);
} catch (\Exception $e) {
throw new \Exception("Malformed RESPONSE message: {$e->getMessage()}");
}
return new ResponseMessage($data['no'], $data['error'] ?? null, $data['data'] ?? null);
case Message::PING:
return new PingMessage();
break;
case Message::PONG:
return new PongMessage();
break;
default:
throw new \Exception("Malformed message: unexpected type {$type}");
}
}
/**
* @param mixed $data
* @param array $schema
* @return bool
*/
protected static function validateData($data, array $schema) {
if (!$data || !is_array($data))
throw new \Exception('data must be array');
foreach ($schema as $schema_item) {
list ($key_name, $key_types, $key_required) = $schema_item;
if (!isset($data[$key_name])) {
if ($key_required)
throw new \Exception("'{$key_name}' is missing");
continue;
}
$passed = false;
for ($i = 0; $i < strlen($key_types); $i++) {
$type = $key_types[$i];
switch ($type) {
case 'i':
if (is_int($data[$key_name]))
$passed = true;
break;
case 'f':
if (is_float($data[$key_name]))
$passed = true;
break;
case 's':
if (is_string($data[$key_name]))
$passed = true;
break;
case 'a':
if (is_array($data[$key_name]))
$passed = true;
break;
default:
trigger_error(__METHOD__.': unexpected type '.$type);
break;
}
if ($passed)
break;
}
if (!$passed)
throw new \Exception("{$key_name}: required type is '{$key_types}'");
}
}
/**
* @return bool
*/
public function close() {
if (!$this->sock)
return;
fclose($this->sock);
$this->sock = null;
}
}
|
