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<?php |
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/* |
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* This file is part of the ManageWP Worker plugin. |
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* |
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* (c) ManageWP LLC <contact@managewp.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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|
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class MWP_Stream_ProcessOutput extends MWP_Stream_Callable |
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{ |
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|
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/** |
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* @var Symfony_Process_Process |
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*/ |
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private $process; |
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|
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/** |
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* @var bool |
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*/ |
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private $ran = false; |
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|
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public function __construct(Symfony_Process_Process $process) |
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{ |
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parent::__construct(array($this, 'getIncrementalOutput')); |
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$this->process = $process; |
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} |
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|
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/** |
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* Returns incremental process output (even if empty string) or false if the process has finished |
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* successfully and all output was already returned. |
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* |
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* @throws Symfony_Process_Exception_ProcessFailedException If the process did not exit successfully. |
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* |
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* @internal |
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* |
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* @return string|false |
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*/ |
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public function getIncrementalOutput() |
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{ |
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if (!$this->ran) { |
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$this->ran = true; |
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try { |
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$this->process->start(); |
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} catch (Symfony_Process_Exception_ExceptionInterface $e) { |
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throw new Symfony_Process_Exception_ProcessFailedException($this->process); |
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} |
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} |
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|
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if ($this->process->isRunning()) { |
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$output = $this->process->getIncrementalOutput(); |
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$this->process->clearOutput(); |
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|
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if (strlen($output) < Symfony_Process_Pipes_PipesInterface::CHUNK_SIZE) { |
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// Don't hog the processor while waiting for incremental process output. |
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usleep(100000); |
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} |
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|
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// The stream will be read again because we're returning a string. |
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return (string)$output; |
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} else { |
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if (!$this->process->isSuccessful()) { |
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throw new Symfony_Process_Exception_ProcessFailedException($this->process); |
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} |
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|
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$output = $this->process->getIncrementalOutput(); |
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$this->process->clearOutput(); |
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|
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// The process has finished and is successful. This part will probably get run twice, |
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// first time we'll return final output, second time we'll return 'false' and break the loop. |
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return strlen($output) ? $output : false; |
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} |
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} |
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} |
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|
