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<?php |
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namespace PhpAmqpLib\Wire\IO; |
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use PhpAmqpLib\Exception\AMQPIOException; |
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use PhpAmqpLib\Exception\AMQPRuntimeException; |
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use PhpAmqpLib\Exception\AMQPTimeoutException; |
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use PhpAmqpLib\Helper\MiscHelper; |
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use PhpAmqpLib\Wire\AMQPWriter; |
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class StreamIO extends AbstractIO |
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{ |
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/** @var string */ |
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protected $protocol; |
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/** @var string */ |
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protected $host; |
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/** @var int */ |
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protected $port; |
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/** @var int */ |
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protected $connection_timeout; |
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/** @var int */ |
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protected $read_write_timeout; |
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/** @var resource */ |
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protected $context; |
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/** @var bool */ |
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protected $keepalive; |
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/** @var int */ |
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protected $heartbeat; |
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/** @var float */ |
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protected $last_read; |
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/** @var float */ |
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protected $last_write; |
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/** @var array */ |
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protected $last_error; |
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/** @var resource */ |
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private $sock; |
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/** @var bool */ |
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private $canSelectNull; |
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/** @var bool */ |
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private $canDispatchPcntlSignal; |
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/** |
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* @param string $host |
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* @param int $port |
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* @param int $connection_timeout |
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* @param int $read_write_timeout |
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* @param null $context |
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* @param bool $keepalive |
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* @param int $heartbeat |
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*/ |
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public function __construct( |
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$host, |
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$port, |
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$connection_timeout, |
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$read_write_timeout, |
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$context = null, |
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$keepalive = false, |
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$heartbeat = 0 |
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) { |
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$this->protocol = 'tcp'; |
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$this->host = $host; |
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$this->port = $port; |
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$this->connection_timeout = $connection_timeout; |
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$this->read_write_timeout = $read_write_timeout; |
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$this->context = $context; |
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$this->keepalive = $keepalive; |
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$this->heartbeat = $heartbeat; |
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$this->canSelectNull = true; |
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$this->canDispatchPcntlSignal = $this->isPcntlSignalEnabled(); |
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if (is_null($this->context)) { |
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$this->context = stream_context_create(); |
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} else { |
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$this->protocol = 'ssl'; |
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// php bugs 41631 & 65137 prevent select null from working on ssl streams |
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if (PHP_VERSION_ID < 50436) { |
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$this->canSelectNull = false; |
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} |
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} |
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} |
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/** |
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* @return bool |
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*/ |
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private function isPcntlSignalEnabled() |
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{ |
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return extension_loaded('pcntl') |
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&& function_exists('pcntl_signal_dispatch') |
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&& (defined('AMQP_WITHOUT_SIGNALS') && !AMQP_WITHOUT_SIGNALS); |
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} |
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/** |
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* Sets up the stream connection |
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* |
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* @throws \PhpAmqpLib\Exception\AMQPRuntimeException |
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* @throws \Exception |
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*/ |
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public function connect() |
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{ |
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$errstr = $errno = null; |
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$remote = sprintf( |
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'%s://%s:%s', |
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$this->protocol, |
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$this->host, |
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$this->port |
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); |
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set_error_handler(array($this, 'error_handler')); |
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$this->sock = stream_socket_client( |
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$remote, |
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$errno, |
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$errstr, |
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$this->connection_timeout, |
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STREAM_CLIENT_CONNECT, |
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$this->context |
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); |
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restore_error_handler(); |
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if (false === $this->sock) { |
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throw new AMQPRuntimeException( |
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sprintf( |
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'Error Connecting to server(%s): %s ', |
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$errno, |
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$errstr |
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), |
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$errno |
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); |
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} |
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if (false === stream_socket_get_name($this->sock, true)) { |
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throw new AMQPRuntimeException( |
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sprintf( |
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'Connection refused: %s ', |
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$remote |
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) |
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); |
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} |
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list($sec, $uSec) = MiscHelper::splitSecondsMicroseconds($this->read_write_timeout); |
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if (!stream_set_timeout($this->sock, $sec, $uSec)) { |
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throw new AMQPIOException('Timeout could not be set'); |
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} |
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// php cannot capture signals while streams are blocking |
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if ($this->canDispatchPcntlSignal) { |
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stream_set_blocking($this->sock, 0); |
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stream_set_write_buffer($this->sock, 0); |
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if (function_exists('stream_set_read_buffer')) { |
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stream_set_read_buffer($this->sock, 0); |
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} |
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} else { |
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stream_set_blocking($this->sock, 1); |
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} |
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if ($this->keepalive) { |
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$this->enable_keepalive(); |
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} |
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} |
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/** |
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* Reconnects the socket |
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*/ |
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public function reconnect() |
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{ |
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$this->close(); |
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$this->connect(); |
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} |
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/** |
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* @param $len |
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* @throws \PhpAmqpLib\Exception\AMQPIOException |
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* @return mixed|string |
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*/ |
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public function read($len) |
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{ |
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$read = 0; |
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$data = ''; |
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while ($read < $len) { |
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$this->check_heartbeat(); |
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if (!is_resource($this->sock) || feof($this->sock)) { |
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throw new AMQPRuntimeException('Broken pipe or closed connection'); |
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} |
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set_error_handler(array($this, 'error_handler')); |
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$buffer = fread($this->sock, ($len - $read)); |
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restore_error_handler(); |
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if ($buffer === false) { |
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throw new AMQPRuntimeException('Error receiving data'); |
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} |
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if ($buffer === '') { |
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if ($this->canDispatchPcntlSignal) { |
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// prevent cpu from being consumed while waiting |
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if ($this->canSelectNull) { |
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$this->select(null, null); |
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pcntl_signal_dispatch(); |
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} else { |
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usleep(100000); |
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pcntl_signal_dispatch(); |
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} |
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} |
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continue; |
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} |
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$read += mb_strlen($buffer, 'ASCII'); |
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$data .= $buffer; |
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} |
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if (mb_strlen($data, 'ASCII') !== $len) { |
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throw new AMQPRuntimeException( |
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sprintf( |
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'Error reading data. Received %s instead of expected %s bytes', |
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mb_strlen($data, 'ASCII'), |
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$len |
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) |
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); |
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} |
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$this->last_read = microtime(true); |
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return $data; |
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} |
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/** |
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* @param $data |
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* @return mixed|void |
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* @throws \PhpAmqpLib\Exception\AMQPRuntimeException |
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* @throws \PhpAmqpLib\Exception\AMQPTimeoutException |
246
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*/ |
247
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public function write($data) |
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{ |
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$written = 0; |
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48 |
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$len = mb_strlen($data, 'ASCII'); |
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while ($written < $len) { |
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if (!is_resource($this->sock)) { |
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throw new AMQPRuntimeException('Broken pipe or closed connection'); |
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} |
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258
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set_error_handler(array($this, 'error_handler')); |
259
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// OpenSSL's C library function SSL_write() can balk on buffers > 8192 |
260
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// bytes in length, so we're limiting the write size here. On both TLS |
261
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// and plaintext connections, the write loop will continue until the |
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// buffer has been fully written. |
263
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// This behavior has been observed in OpenSSL dating back to at least |
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// September 2002: |
265
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// http://comments.gmane.org/gmane.comp.encryption.openssl.user/4361 |
266
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48 |
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$buffer = fwrite($this->sock, $data, 8192); |
267
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restore_error_handler(); |
268
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269
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if ($buffer === false) { |
270
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throw new AMQPRuntimeException('Error sending data'); |
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} |
272
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273
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48 |
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if ($buffer === 0 && feof($this->sock)) { |
274
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throw new AMQPRuntimeException('Broken pipe or closed connection'); |
275
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} |
276
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277
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48 |
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if ($this->timed_out()) { |
278
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throw new AMQPTimeoutException('Error sending data. Socket connection timed out'); |
279
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} |
280
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281
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48 |
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$written += $buffer; |
282
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283
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48 |
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if ($buffer > 0) { |
284
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$data = mb_substr($data, $buffer, mb_strlen($data, 'ASCII') - $buffer, 'ASCII'); |
285
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} |
286
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} |
287
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288
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48 |
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$this->last_write = microtime(true); |
289
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} |
290
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291
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/** |
292
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* Internal error handler to deal with stream and socket errors that need to be ignored |
293
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* |
294
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* @param int $errno |
295
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* @param string $errstr |
296
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* @param string $errfile |
297
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* @param int $errline |
298
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* @param array $errcontext |
299
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* @return null |
300
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* @throws \ErrorException |
301
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*/ |
302
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public function error_handler($errno, $errstr, $errfile, $errline, $errcontext = null) |
303
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{ |
304
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$this->last_error = compact('errno', 'errstr', 'errfile', 'errline', 'errcontext'); |
305
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306
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// fwrite notice that the stream isn't ready |
307
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if (strstr($errstr, 'Resource temporarily unavailable')) { |
308
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// it's allowed to retry |
309
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return null; |
310
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} |
311
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312
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// stream_select warning that it has been interrupted by a signal |
313
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if (strstr($errstr, 'Interrupted system call')) { |
314
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// it's allowed while processing signals |
315
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return null; |
316
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} |
317
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318
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restore_error_handler(); |
319
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320
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// raise all other issues to exceptions |
321
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throw new \ErrorException($errstr, 0, $errno, $errfile, $errline); |
322
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} |
323
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324
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/** |
325
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* Heartbeat logic: check connection health here |
326
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*/ |
327
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48 |
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protected function check_heartbeat() |
328
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{ |
329
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// ignore unless heartbeat interval is set |
330
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48 |
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if ($this->heartbeat !== 0 && $this->last_read && $this->last_write) { |
331
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$t = microtime(true); |
332
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$t_read = round($t - $this->last_read); |
333
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$t_write = round($t - $this->last_write); |
334
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335
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// server has gone away |
336
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if (($this->heartbeat * 2) < $t_read) { |
337
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$this->reconnect(); |
338
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} |
339
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340
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// time for client to send a heartbeat |
341
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if (($this->heartbeat / 2) < $t_write) { |
342
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$this->write_heartbeat(); |
343
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} |
344
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} |
345
|
48 |
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} |
346
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|
347
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/** |
348
|
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* Sends a heartbeat message |
349
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*/ |
350
|
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protected function write_heartbeat() |
351
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{ |
352
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$pkt = new AMQPWriter(); |
353
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$pkt->write_octet(8); |
354
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$pkt->write_short(0); |
355
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$pkt->write_long(0); |
356
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$pkt->write_octet(0xCE); |
357
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$this->write($pkt->getvalue()); |
358
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} |
359
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|
360
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48 |
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public function close() |
361
|
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{ |
362
|
48 |
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if (is_resource($this->sock)) { |
363
|
48 |
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fclose($this->sock); |
364
|
32 |
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} |
365
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48 |
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$this->sock = null; |
366
|
48 |
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} |
367
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|
368
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/** |
369
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* @return resource |
370
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*/ |
371
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public function get_socket() |
372
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|
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{ |
373
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return $this->sock; |
374
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} |
375
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|
376
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/** |
377
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* @return resource |
378
|
|
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*/ |
379
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|
public function getSocket() |
380
|
|
|
{ |
381
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return $this->get_socket(); |
382
|
|
|
} |
383
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|
|
|
384
|
|
|
/** |
385
|
|
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* @param $sec |
386
|
|
|
* @param $usec |
387
|
|
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* @return int|mixed |
388
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*/ |
389
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|
|
public function select($sec, $usec) |
390
|
|
|
{ |
391
|
|
|
$read = array($this->sock); |
392
|
|
|
$write = null; |
393
|
|
|
$except = null; |
394
|
|
|
$result = false; |
|
|
|
|
395
|
|
|
|
396
|
|
|
set_error_handler(array($this, 'error_handler')); |
397
|
|
|
$result = stream_select($read, $write, $except, $sec, $usec); |
398
|
|
|
restore_error_handler(); |
399
|
|
|
|
400
|
|
|
return $result; |
401
|
|
|
} |
402
|
|
|
|
403
|
|
|
/** |
404
|
|
|
* @return mixed |
405
|
|
|
*/ |
406
|
48 |
|
protected function timed_out() |
407
|
|
|
{ |
408
|
|
|
// get status of socket to determine whether or not it has timed out |
409
|
48 |
|
$info = stream_get_meta_data($this->sock); |
410
|
|
|
|
411
|
48 |
|
return $info['timed_out']; |
412
|
|
|
} |
413
|
|
|
|
414
|
|
|
/** |
415
|
|
|
* @throws \PhpAmqpLib\Exception\AMQPIOException |
416
|
|
|
*/ |
417
|
|
|
protected function enable_keepalive() |
418
|
|
|
{ |
419
|
|
|
if (!function_exists('socket_import_stream')) { |
420
|
|
|
throw new AMQPIOException('Can not enable keepalive: function socket_import_stream does not exist'); |
421
|
|
|
} |
422
|
|
|
|
423
|
|
|
if (!defined('SOL_SOCKET') || !defined('SO_KEEPALIVE')) { |
424
|
|
|
throw new AMQPIOException('Can not enable keepalive: SOL_SOCKET or SO_KEEPALIVE is not defined'); |
425
|
|
|
} |
426
|
|
|
|
427
|
|
|
$socket = socket_import_stream($this->sock); |
428
|
|
|
socket_set_option($socket, SOL_SOCKET, SO_KEEPALIVE, 1); |
429
|
|
|
} |
430
|
|
|
|
431
|
4 |
|
/** |
432
|
|
|
* @return $this |
433
|
|
|
*/ |
434
|
|
|
public function disableHeartbeat() |
435
|
|
|
{ |
436
|
|
|
$this->heartbeat = 0; |
437
|
|
|
|
438
|
|
|
return $this; |
439
|
|
|
} |
440
|
|
|
} |
441
|
|
|
|
This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVar
assignment in line 1 and the$higher
assignment in line 2 are dead. The first because$myVar
is never used and the second because$higher
is always overwritten for every possible time line.