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<?php |
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namespace Pheanstalk\Socket; |
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use Pheanstalk\Contract\SocketInterface; |
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use Pheanstalk\Exception\ConnectionException; |
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use Pheanstalk\Exception\SocketException; |
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/** |
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* A Socket implementation using the Sockets extension |
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*/ |
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class SocketSocket implements SocketInterface |
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{ |
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/** @var resource */ |
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private $socket; |
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public function __construct( |
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string $host, |
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int $port, |
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float $connectTimeout |
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) { |
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if (!extension_loaded('sockets')) { |
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throw new \Exception('Sockets extension not found'); |
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} |
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$this->socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); |
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if ($this->socket === false) { |
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$this->throwException(); |
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} |
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$timeout = [ |
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'sec' => intval($connectTimeout), |
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'usec' => ($connectTimeout - intval($connectTimeout)) * 1000000 |
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]; |
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$sendTimeout = socket_get_option($this->socket, SOL_SOCKET, SO_SNDTIMEO); |
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$receiveTimeout = socket_get_option($this->socket, SOL_SOCKET, SO_RCVTIMEO); |
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socket_set_option($this->socket, SOL_SOCKET, SO_KEEPALIVE, 1); |
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socket_set_option($this->socket, SOL_SOCKET, SO_SNDTIMEO, $timeout); |
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socket_set_option($this->socket, SOL_SOCKET, SO_RCVTIMEO, $timeout); |
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if (socket_set_block($this->socket) === false) { |
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throw new ConnectionException(0, "Failed to set socket to blocking mode"); |
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} |
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$addresses = gethostbynamel($host); |
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if ($addresses === false) { |
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throw new ConnectionException(0, "Could not resolve hostname $host"); |
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} |
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if (@socket_connect($this->socket, $addresses[0], $port) === false) { |
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$error = socket_last_error($this->socket); |
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throw new ConnectionException($error, socket_strerror($error)); |
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}; |
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socket_set_option($this->socket, SOL_SOCKET, SO_SNDTIMEO, $sendTimeout); |
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socket_set_option($this->socket, SOL_SOCKET, SO_RCVTIMEO, $receiveTimeout); |
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} |
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/** |
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* Writes data to the socket. |
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* |
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* @param string $data |
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* |
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* @return void |
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*/ |
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public function write(string $data): void |
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{ |
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$this->checkClosed(); |
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while (!empty($data)) { |
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$written = socket_write($this->socket, $data); |
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if ($written === false) { |
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$this->throwException(); |
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} |
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$data = substr($data, $written); |
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} |
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} |
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private function throwException() |
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{ |
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$error = socket_last_error($this->socket); |
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throw new SocketException(socket_strerror($error), $error); |
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} |
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private function checkClosed() |
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{ |
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if (!isset($this->socket)) { |
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throw new SocketException('The connection was closed'); |
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} |
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} |
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/** |
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* Reads up to $length bytes from the socket. |
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* |
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* @return string |
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*/ |
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public function read(int $length): string |
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{ |
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$this->checkClosed(); |
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$buffer = ''; |
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while (mb_strlen($buffer, '8BIT') < $length) { |
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$result = socket_read($this->socket, $length - mb_strlen($buffer, '8BIT')); |
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if ($result === false) { |
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$this->throwException(); |
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} |
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$buffer .= $result; |
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} |
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return $buffer; |
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} |
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public function getLine(): string |
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{ |
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$this->checkClosed(); |
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$buffer = ''; |
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// Reading stops at \r or \n. In case it stopped at \r we must continue reading. |
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while (substr($buffer, -1, 1) !== "\n") { |
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$result = socket_read($this->socket, 1024, PHP_NORMAL_READ); |
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if ($result === false) { |
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$this->throwException(); |
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} |
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$buffer .= $result; |
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} |
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return rtrim($buffer); |
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} |
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/** |
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* Disconnect the socket; subsequent usage of the socket will fail. |
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*/ |
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public function disconnect(): void |
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{ |
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$this->checkClosed(); |
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socket_close($this->socket); |
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unset($this->socket); |
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} |
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} |
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Our type inference engine has found a suspicous assignment of a value to a property. This check raises an issue when a value that can be of a mixed type is assigned to a property that is type hinted more strictly.
For example, imagine you have a variable
$accountId
that can either hold an Id object or false (if there is no account id yet). Your code now assigns that value to theid
property of an instance of theAccount
class. This class holds a proper account, so the id value must no longer be false.Either this assignment is in error or a type check should be added for that assignment.