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<?php |
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namespace Pageon\Pcntl; |
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/** |
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* This Manager is used to create and wait for forked processes which can be executed in parallel. |
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* It's a wrapper around `ext-pcntl`. |
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* |
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* Class Manager |
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* @package Pageon\Pcntl |
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*/ |
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class Manager |
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{ |
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/** |
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* Create an asynchronous process. |
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* |
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* @param Process $process The process to run asynchronous. |
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* |
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* @return Process The asynchronous process. |
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*/ |
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public function async(Process $process) : Process { |
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$sockets = stream_socket_pair(STREAM_PF_UNIX, STREAM_SOCK_STREAM, STREAM_IPPROTO_IP); |
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list($parentSocket, $childSocket) = $sockets; |
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if (($pid = pcntl_fork()) == 0) { |
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fclose($childSocket); |
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$output = serialize($process->execute()); |
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fwrite($parentSocket, $output); |
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fclose($parentSocket); |
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exit; |
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} |
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fclose($parentSocket); |
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$process |
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->setStartTime(time()) |
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->setPid($pid) |
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->setSocket($childSocket); |
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return $process; |
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} |
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/** |
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* Wait for a collection of processes to finish. |
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* |
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* @param ProcessCollection $processCollection |
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* |
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* @return array |
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* @throws \Exception |
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*/ |
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public function wait(ProcessCollection $processCollection) { |
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$output = []; |
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$processes = $processCollection->toArray(); |
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do { |
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usleep(100000); |
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/** @var Process $process */ |
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foreach ($processes as $key => $process) { |
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$processStatus = pcntl_waitpid($process->getPid(), $processStatus, WNOHANG | WUNTRACED); |
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$this->handleProcessStatus($processStatus, $process, $processes, $key); |
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} |
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} while (count($processes)); |
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return $output; |
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} |
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/** |
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* @param $processStatus |
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* @param Process $process |
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* @param array $processes |
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* @param $key |
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* |
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* @throws \Exception |
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*/ |
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private function handleProcessStatus($processStatus, Process $process, array &$processes, $key) { |
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switch ($processStatus) { |
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case $process->getPid(): |
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$this->handleProcessSuccess($process); |
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unset($processes[$key]); |
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break; |
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case 0: |
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if ($process->getStartTime() + $process->getMaxRunTime() < time() || pcntl_wifstopped($processStatus)) { |
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$this->handleProcessStop($process); |
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unset($processes[$key]); |
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} |
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break; |
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default: |
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throw new \Exception("Could not reliably manage {$process->getPid()}"); |
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} |
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} |
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/** |
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* Handle a successful process. |
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* |
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* @param Process $process |
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*/ |
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private function handleProcessSuccess(Process $process) { |
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$output = ''; |
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while (!feof($process->getSocket())) { |
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$output .= fgets($process->getSocket()); |
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} |
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fclose($process->getSocket()); |
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if ($success = $process->getSuccess()) { |
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call_user_func_array($success, [unserialize($output), $process]); |
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} |
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} |
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/** |
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* Handle a stopped process. |
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* |
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* @param Process $process |
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* |
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* @throws \Exception |
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*/ |
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private function handleProcessStop(Process $process) { |
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if (!posix_kill($process->getPid(), SIGKILL)) { |
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throw new \Exception('Failed to kill ' . $process->getPid() . ': ' . posix_strerror(posix_get_last_error())); |
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} |
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} |
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} |
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pageon /
stitcher-core
