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PhutilSocketChannel.php
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Fri, Dec 27, 16:45

PhutilSocketChannel.php
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<?php
/**
* Channel on an underlying stream socket or socket pair. For a description of
* channels, see @{class:PhutilChannel}.
*
* Using a network socket:
*
* $socket = stream_socket_client(...);
* $channel = new PhutilSocketChannel($socket);
*
* Using stdin/stdout:
*
* $channel = new PhutilSocketChannel(
* fopen('php://stdin', 'r'),
* fopen('php://stdout', 'w'));
*
* @task construct Construction
*
* @group channel
*/
final class PhutilSocketChannel extends PhutilChannel {
private $readSocket;
private $writeSocket;
private $isSingleSocket;
/* -( Construction )------------------------------------------------------- */
/**
* Construct a socket channel from a socket or a socket pair.
*
* NOTE: This must be a //stream// socket from `stream_socket_client()` or
* `stream_socket_server()` or similar, not a //plain// socket from
* `socket_create()` or similar.
*
* @param socket Socket (stream socket, not plain socket). If only one
* socket is provided, it is used for reading and writing.
* @param socket? Optional write socket.
*
* @task construct
*/
public function __construct($read_socket, $write_socket = null) {
parent::__construct();
foreach (array($read_socket, $write_socket) as $socket) {
if (!$socket) {
continue;
}
$ok = stream_set_blocking($socket, false);
if (!$ok) {
throw new Exception("Failed to set socket nonblocking!");
}
}
$this->readSocket = $read_socket;
if ($write_socket) {
$this->writeSocket = $write_socket;
} else {
$this->writeSocket = $read_socket;
$this->isSingleSocket = true;
}
}
public function __destruct() {
$this->closeSockets();
}
/**
* Creates a pair of socket channels that are connected to each other. This
* is mostly useful for writing unit tests of, e.g., protocol channels.
*
* list($x, $y) = PhutilSocketChannel::newChannelPair();
*
* @task construct
*/
public static function newChannelPair() {
$sockets = null;
$domain = phutil_is_windows() ? STREAM_PF_INET : STREAM_PF_UNIX;
$pair = stream_socket_pair($domain, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP);
if (!$pair) {
throw new Exception("stream_socket_pair() failed!");
}
$x = new PhutilSocketChannel($pair[0]);
$y = new PhutilSocketChannel($pair[1]);
return array($x, $y);
}
public function isOpen() {
return ($this->isOpenForReading() || $this->isOpenForWriting());
}
public function isOpenForReading() {
return (bool)$this->readSocket;
}
public function isOpenForWriting() {
return (bool)$this->writeSocket;
}
protected function readBytes() {
$socket = $this->readSocket;
if (!$socket) {
return '';
}
$data = @fread($socket, 4096);
if ($data === false) {
$this->closeReadSocket();
$data = '';
}
// NOTE: fread() continues returning empty string after the socket is
// closed, we need to check for EOF explicitly.
if ($data === '') {
if (feof($socket)) {
$this->closeReadSocket();
}
}
return $data;
}
protected function writeBytes($bytes) {
$socket = $this->writeSocket;
if (!$socket) {
return 0;
}
$len = phutil_fwrite_nonblocking_stream($socket, $bytes);
if ($len === false) {
$this->closeWriteSocket();
return 0;
}
return $len;
}
protected function getReadSockets() {
if ($this->readSocket) {
return array($this->readSocket);
}
return array();
}
protected function getWriteSockets() {
if ($this->writeSocket) {
return array($this->writeSocket);
} else {
return array();
}
}
private function closeReadSocket() {
$this->closeOneSocket($this->readSocket);
$this->readSocket = null;
if ($this->isSingleSocket) {
$this->writeSocket = null;
}
}
private function closeWriteSocket() {
$this->closeOneSocket($this->writeSocket);
$this->writeSocket = null;
if ($this->isSingleSocket) {
$this->readSocket = null;
}
}
public function closeWriteChannel() {
$this->closeWriteSocket();
}
private function closeOneSocket($socket) {
if (!$socket) {
return;
}
// We should also stream_socket_shutdown() here but HHVM throws errors
// with it (for example 'Unexpected object type PlainFile'). We depend
// just on fclose() until it is fixed.
@fclose($socket);
}
private function closeSockets() {
$this->closeReadSocket();
$this->closeWriteSocket();
}
}

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