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<?php |
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/** |
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* Async sockets |
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* |
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* @copyright Copyright (c) 2015, Efimov Evgenij <[email protected]> |
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* |
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* This source file is subject to the MIT license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace AsyncSockets\Socket\Io; |
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use AsyncSockets\Frame\FramePickerInterface; |
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/** |
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* Class StreamedClientIo |
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*/ |
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class StreamedClientIo extends AbstractClientIo |
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{ |
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/** |
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* Read attempts count |
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*/ |
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const READ_ATTEMPTS = 2; |
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/** |
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* Amount of read attempts |
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* |
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* @var int |
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*/ |
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private $readAttempts = self::READ_ATTEMPTS; |
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/** |
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* Remote socket address |
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* |
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* @var string |
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*/ |
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private $remoteAddress; |
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/** {@inheritdoc} */ |
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protected function readRawDataIntoPicker(FramePickerInterface $picker) |
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{ |
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// work-around https://bugs.php.net/bug.php?id=52602 |
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$resource = $this->socket->getStreamResource(); |
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$readContext = [ |
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'countCycles' => 0, |
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'dataBeforeIo' => $this->getDataInSocket(), |
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'isStreamDataEmpty' => false, |
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]; |
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do { |
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$data = fread($resource, self::SOCKET_BUFFER_SIZE); |
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$this->throwNetworkSocketExceptionIf($data === false, 'Failed to read data.'); |
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$isDataEmpty = $data === ''; |
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$result = $picker->pickUpData($data, $this->getRemoteAddress()); |
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$readContext['countCycles'] += 1; |
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$readContext['isStreamDataEmpty'] = $this->isReadDataActuallyEmpty($data); |
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$this->readAttempts = $this->resolveReadAttempts($readContext, $this->readAttempts); |
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} while (!$this->isEndOfFrameReached($picker, false) && !$isDataEmpty); |
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return $result; |
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} |
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/** |
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* Calculate attempts value |
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* |
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* @param array $context Read context |
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* @param int $currentAttempts Current attempts counter |
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* |
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* @return int |
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*/ |
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private function resolveReadAttempts(array $context, $currentAttempts) |
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{ |
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return ($context['countCycles'] === 1 && empty($context['dataBeforeIo'])) || |
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($context['countCycles'] > 1 && $context['isStreamDataEmpty']) ? |
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$currentAttempts - 1 : |
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self::READ_ATTEMPTS; |
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} |
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/** {@inheritdoc} */ |
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protected function writeRawData($data) |
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{ |
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$resource = $this->socket->getStreamResource(); |
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$test = stream_socket_sendto($resource, ''); |
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$this->throwNetworkSocketExceptionIf($test !== 0, 'Failed to send data.'); |
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$written = fwrite($resource, $data, strlen($data)); |
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$this->throwNetworkSocketExceptionIf($written === false, 'Failed to send data.'); |
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if ($written === 0) { |
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$this->throwExceptionIfNotConnected('Remote connection has been lost.'); |
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} |
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return $written; |
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} |
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/** {@inheritdoc} */ |
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protected function isConnected() |
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{ |
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return $this->resolveRemoteAddress() !== false; |
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} |
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/** {@inheritdoc} */ |
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protected function getRemoteAddress() |
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{ |
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if ($this->remoteAddress === null) { |
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$this->remoteAddress = $this->resolveRemoteAddress(); |
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} |
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return $this->remoteAddress; |
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} |
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/** |
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* Checks whether data read from stream buffer can be filled later |
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* |
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* @param string $data Read data |
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* |
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* @return bool |
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*/ |
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private function isReadDataActuallyEmpty($data) |
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{ |
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$result = false; |
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if ($data === '') { |
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$dataInSocket = $this->getDataInSocket(); |
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$result = $dataInSocket === '' || $dataInSocket === false; |
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} |
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return $result; |
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} |
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/** {@inheritdoc} */ |
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protected function isEndOfTransfer() |
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{ |
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return $this->getDataInSocket() === ''; |
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} |
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/** {@inheritdoc} */ |
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protected function canReachFrame() |
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{ |
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return $this->readAttempts > 0 && $this->isConnected(); |
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} |
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/** |
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* Return first byte from socket buffer |
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* |
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* @return string |
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*/ |
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private function getDataInSocket() |
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{ |
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return stream_socket_recvfrom($this->socket->getStreamResource(), 1, STREAM_PEEK); |
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} |
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/** |
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* Return remote address if we connected or false otherwise |
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* |
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* @return string|bool |
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*/ |
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private function resolveRemoteAddress() |
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{ |
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return stream_socket_get_name($this->socket->getStreamResource(), true); |
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} |
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} |
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|
edefimov /
async-sockets
