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<?php |
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/* |
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* This file is part of the php-gelf package. |
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* |
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* (c) Benjamin Zikarsky <http://benjamin-zikarsky.de> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Gelf\Transport; |
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use RuntimeException; |
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use ParagonIE\ConstantTime\Binary; |
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/** |
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* StreamSocketClient is a very simple OO-Wrapper around the PHP |
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* stream_socket-library and some specific stream-functions like |
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* fwrite, etc. |
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* |
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* @author Benjamin Zikarsky <[email protected]> |
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*/ |
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class StreamSocketClient |
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{ |
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/** |
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* @deprecated deprecated since v1.4.0 |
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*/ |
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const SOCKET_TIMEOUT = 30; |
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/** |
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* @var string |
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*/ |
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protected $host; |
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/** |
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* @var integer |
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*/ |
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protected $port; |
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/** |
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* @var string |
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*/ |
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protected $scheme; |
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/** |
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* @var array |
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*/ |
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protected $context; |
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/** |
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* @var resource |
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*/ |
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protected $socket; |
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/** |
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* @var int |
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*/ |
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protected $connectTimeout = self::SOCKET_TIMEOUT; |
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/** |
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* @param string $scheme |
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* @param string $host |
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* @param integer $port |
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* @param array $context |
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*/ |
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public function __construct($scheme, $host, $port, array $context = array()) |
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{ |
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$this->scheme = $scheme; |
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$this->host = $host; |
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$this->port = $port; |
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$this->context = $context; |
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} |
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/** |
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* Destructor, closes socket if possible |
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*/ |
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public function __destruct() |
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{ |
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$this->close(); |
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} |
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/** |
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* Initializes socket-client |
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* |
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* @deprecated deprecated since v1.4.0 |
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* |
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* @param string $scheme like "udp" or "tcp" |
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* @param string $host |
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* @param integer $port |
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* @param array $context |
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* |
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* @return resource |
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* |
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* @throws RuntimeException on connection-failure |
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*/ |
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protected static function initSocket($scheme, $host, $port, array $context) |
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{ |
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$socketDescriptor = sprintf("%s://%s:%d", $scheme, $host, $port); |
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$socket = @stream_socket_client( |
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$socketDescriptor, |
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$errNo, |
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$errStr, |
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static::SOCKET_TIMEOUT, |
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\STREAM_CLIENT_CONNECT, |
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stream_context_create($context) |
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); |
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if ($socket === false) { |
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throw new RuntimeException( |
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sprintf( |
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"Failed to create socket-client for %s: %s (%s)", |
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$socketDescriptor, |
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$errStr, |
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$errNo |
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) |
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); |
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} |
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// set non-blocking for UDP |
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if (strcasecmp("udp", $scheme) == 0) { |
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stream_set_blocking($socket, 0); |
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} |
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return $socket; |
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} |
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/** |
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* Internal function mimicking the behaviour of static::initSocket |
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* which will get new functionality instead of the deprecated |
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* "factory" |
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* |
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* @return resource |
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* |
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* @throws RuntimeException on connection-failure |
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*/ |
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private function buildSocket() |
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{ |
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$socketDescriptor = sprintf( |
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"%s://%s:%d", |
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$this->scheme, |
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$this->host, |
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$this->port |
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); |
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$socket = @stream_socket_client( |
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$socketDescriptor, |
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$errNo, |
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$errStr, |
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$this->connectTimeout, |
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\STREAM_CLIENT_CONNECT, |
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stream_context_create($this->context) |
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); |
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if ($socket === false) { |
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1 |
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throw new RuntimeException( |
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1 |
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sprintf( |
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"Failed to create socket-client for %s: %s (%s)", |
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$socketDescriptor, |
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1 |
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$errStr, |
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1 |
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$errNo |
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) |
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); |
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} |
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// set non-blocking for UDP |
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if (strcasecmp("udp", $this->scheme) == 0) { |
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stream_set_blocking($socket, 0); |
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} |
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return $socket; |
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} |
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/** |
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* Returns raw-socket-resource |
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* |
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* @return resource |
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*/ |
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public function getSocket() |
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{ |
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// lazy initializing of socket-descriptor |
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if (!$this->socket) { |
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$this->socket = $this->buildSocket(); |
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} |
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return $this->socket; |
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} |
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/** |
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* Writes a given string to the socket and returns the |
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* number of written bytes |
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* |
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* @param string $buffer |
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* |
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* @return int |
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* |
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* @throws RuntimeException on write-failure |
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*/ |
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public function write($buffer) |
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{ |
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$buffer = (string) $buffer; |
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$bufLen = Binary::safeStrlen($buffer); |
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$socket = $this->getSocket(); |
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$written = 0; |
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while ($written < $bufLen) { |
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// PHP's fwrite does not behave nice in regards to errors, so we wrap |
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// it with a temporary error handler and treat every warning/notice as |
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// a error |
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$failed = false; |
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$errorMessage = "Failed to write to socket"; |
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set_error_handler(function ($errno, $errstr) use (&$failed, &$errorMessage) { |
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$failed = true; |
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$errorMessage .= ": $errstr ($errno)"; |
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}); |
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$byteCount = fwrite($socket, Binary::safeSubstr($buffer, $written)); |
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restore_error_handler(); |
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if ($byteCount === 0 && defined('HHVM_VERSION')) { |
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$failed = true; |
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} |
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if ($failed || $byteCount === false) { |
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throw new \RuntimeException($errorMessage); |
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} |
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$written += $byteCount; |
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} |
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return $written; |
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} |
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/** |
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* Reads a given number of bytes from the socket |
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* |
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* @param integer $byteCount |
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* |
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* @return string |
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*/ |
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public function read($byteCount) |
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{ |
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return fread($this->getSocket(), $byteCount); |
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} |
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/** |
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* Closes underlying socket explicitly |
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*/ |
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public function close() |
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{ |
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if (!is_resource($this->socket)) { |
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return; |
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} |
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fclose($this->socket); |
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$this->socket = null; |
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} |
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/** |
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* Returns the current connect-timeout |
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* |
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* @return int |
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*/ |
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1 |
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public function getConnectTimeout() |
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{ |
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return $this->connectTimeout; |
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} |
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/** |
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* Sets the connect-timeout |
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* |
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* @param int $timeout |
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*/ |
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1 |
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public function setConnectTimeout($timeout) |
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{ |
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1 |
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$this->connectTimeout = $timeout; |
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1 |
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} |
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} |
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This check looks for multiple assignments in successive lines of code. It will report an issue if the operators are not in a straight line.
To visualize
will produce issues in the first and second line, while this second example
will produce no issues.