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<?php |
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declare(strict_types=1); |
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namespace PHPFastCGI\FastCGIDaemon\Driver\Userland\Connection; |
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/** |
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* The default implementation of the ConnectionPoolInterface using stream |
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* sockets. |
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*/ |
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final class StreamSocketConnectionPool implements ConnectionPoolInterface |
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{ |
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/** |
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* @var resource |
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*/ |
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private $serverSocket; |
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/** |
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* @var resource[] |
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*/ |
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private $clientSockets; |
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/** |
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* @var ConnectionInterface[] |
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*/ |
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private $connections; |
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/** |
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* @var bool |
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*/ |
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private $shutdown; |
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/** |
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* Constructor. |
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* |
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* @param resource $socket The stream socket to accept connections from |
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*/ |
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public function __construct($socket) |
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{ |
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stream_set_blocking($socket, false); |
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$this->serverSocket = $socket; |
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$this->clientSockets = []; |
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$this->connections = []; |
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$this->shutdown = false; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function getReadableConnections(int $timeout): array |
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{ |
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$this->removeClosedConnections(); |
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$readSockets = $this->clientSockets; |
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if (!$this->shutdown) { |
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$readSockets['pool'] = $this->serverSocket; |
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} |
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$this->selectConnections($readSockets, $timeout); |
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if (isset($readSockets['pool'])) { |
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$this->acceptConnection(); |
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unset($readSockets['pool']); |
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} |
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$readableConnections = []; |
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foreach (array_keys($readSockets) as $id) { |
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$readableConnections[$id] = $this->connections[$id]; |
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} |
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return $readableConnections; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function count(): int |
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{ |
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$this->removeClosedConnections(); |
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return count($this->connections); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function shutdown(): void |
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{ |
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$this->shutdown = true; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function close(): void |
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{ |
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$this->removeClosedConnections(); |
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foreach ($this->connections as $id => $connection) { |
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$connection->close(); |
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unset($this->clientSockets[$id]); |
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unset($this->connections[$id]); |
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} |
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fclose($this->serverSocket); |
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} |
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/** |
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* Uses the stream select function to eliminate all non-readable sockets |
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* from the read sockets parameter. |
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* |
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* @param resource[] $readSockets The sockets to test for readability (output parameter) |
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* @param int $timeout The stream select call timeout |
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*/ |
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private function selectConnections(&$readSockets, int $timeout): void |
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{ |
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// stream_select will not always preserve array keys |
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// call it with a (deep) copy so the original is preserved |
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$read = []; |
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foreach ($readSockets as $id => $socket) { |
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$read[] = $socket; |
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} |
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$writeSockets = $exceptSockets = []; |
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if (false === @stream_select($read, $writeSockets, $exceptSockets, $timeout)) { |
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$error = error_get_last(); |
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if (false === stripos($error['message'], 'interrupted system call')) { |
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throw new \RuntimeException('stream_select failed: '.$error['message']); |
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} |
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$readSockets = []; |
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} else { |
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$res = []; |
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foreach($read as $socket) { |
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$res[array_search($socket, $readSockets)] = $socket; |
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} |
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$readSockets = $res; |
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} |
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} |
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/** |
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* Accept incoming connections from the server stream socket. |
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*/ |
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private function acceptConnection(): void |
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{ |
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$clientSocket = @stream_socket_accept($this->serverSocket); |
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if (false !== $clientSocket) { |
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stream_set_blocking($clientSocket, false); |
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$connection = new StreamSocketConnection($clientSocket); |
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$id = spl_object_hash($connection); |
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$this->clientSockets[$id] = $clientSocket; |
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$this->connections[$id] = $connection; |
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} |
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} |
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private function removeClosedConnections(): void |
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{ |
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foreach ($this->connections as $id => $connection) { |
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if ($connection->isClosed()) { |
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unset($this->clientSockets[$id]); |
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unset($this->connections[$id]); |
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} |
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} |
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} |
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} |
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PHPFastCGI /
FastCGIDaemon
