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<?php
namespace ProcessMaker\Models;
use Log;
use RuntimeException;
/**
* Execute a docker container copying files to interchange information.
*
*/
trait ScriptDockerCopyingFilesTrait
{
/**
* Run a command in a docker container.
*
* @param array $options
*
* @return array
* @throws \RuntimeException
*/
protected function executeCopying(array $options)
{
$container = $this->createContainer($options['image'], $options['command'], $options['parameters']);
foreach ($options['inputs'] as $path => $data) {
$this->putInContainer($container, $path, $data);
}
$response = $this->startContainer($container, $options['timeout']);
$outputs = [];
foreach ($options['outputs'] as $name => $path) {
$outputs[$name] = $this->getFromContainer($container, $path);
}
exec(config('app.bpm_scripts_docker') . ' rm ' . $container);
$response['outputs'] = $outputs;
return $response;
}
/**
* Create a docker container.
*
* @param string $image
* @param string $command
* @param string $parameters
*
* @return string
* @throws \RuntimeException
*/
private function createContainer($image, $command, $parameters = '')
{
$cidfile = tempnam(config('app.bpm_scripts_home'), 'cid');
unlink($cidfile);
$cmd = config('app.bpm_scripts_docker') . sprintf(' create %s --cidfile %s %s %s 2>&1', $parameters, $cidfile, $image, $command);
$line = exec($cmd, $output, $returnCode);
if ($returnCode) {
throw new RuntimeException('Unable to create a docker container: ' . implode("\n", $output));
}
if (!file_exists($cidfile)) {
throw new RuntimeException('Unable to create a docker container: ' . implode("\n", $output));
}
$cid = file_get_contents($cidfile);
unlink($cidfile);
return $cid;
}
/**
* Put a string content into a file in the container.
*
* @param string $container
* @param string $path
* @param string $content
*
* @throws \RuntimeException
*/
private function putInContainer($container, $path, $content)
{
$source = tempnam(config('app.bpm_scripts_home'), 'put');
file_put_contents($source, $content);
list($returnCode, $output) = $this->execCopy($source, $container, $path);
unlink($source);
if ($returnCode) {
throw new RuntimeException('Unable to send data to container: ' . implode("\n", $output));
}
}
/**
* Runs the docker copy command
*
* @param string $source
* @param string $container
* @param string $dest
*
* @throws \RuntimeException
*/
private function execCopy($source, $container, $dest)
{
$cmd = config('app.bpm_scripts_docker')
. sprintf(' cp %s %s:%s 2>&1', $source, $container, $dest);
exec($cmd, $output, $returnCode);
return [$returnCode, $output];
}
/**
* Get the content from a file in the container.
*
* @param string $container
* @param string $path
*
* @return string
* @throws \RuntimeException
*/
private function getFromContainer($container, $path)
{
$target = tempnam(config('app.bpm_scripts_home'), 'get');
$cmd = config('app.bpm_scripts_docker') . sprintf(' cp %s:%s %s 2>&1', $container, $path, $target);
exec($cmd, $output, $returnCode);
$content = file_get_contents($target);
unlink($target);
return $content;
}
/**
* Start the container.
*
* @param string $container
* @param integer $timeout
*
* @return array
*/
private function startContainer($container, $timeout)
{
$cmd = '';
if ($timeout > 0) {
$cmd .= "timeout -s 9 $timeout ";
}
$cmd .= config('app.bpm_scripts_docker') . sprintf(' start %s -a 2>&1', $container);
Log::debug('Running Docker container', [
'timeout' => $timeout,
'cmd' => $cmd,
]);
$line = exec($cmd, $output, $returnCode);
if ($returnCode) {
if ($returnCode == 137) {
Log::error('Script timed out');
} else {
Log::error('Script threw return code ' . $returnCode);
}
throw new RuntimeException(implode("\n", $output));
}
return compact('line', 'output', 'returnCode');
}
}