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<?php
namespace Http\Client\Curl;
use Http\Client\Exception\RequestException;
/**
* Simultaneous requests runner
*
* @license http://opensource.org/licenses/MIT MIT
*
* @author Михаил Красильников <m.krasilnikov@yandex.ru>
*/
class MultiRunner
{
/**
* cURL multi handle
*
* @var resource|null
*/
private $multiHandle = null;
/**
* Awaiting cores
*
* @var PromiseCore[]
*/
private $cores = [];
/**
* Release resources if still active
*/
public function __destruct()
{
if (is_resource($this->multiHandle)) {
curl_multi_close($this->multiHandle);
}
}
/**
* Add promise to runner
*
* @param PromiseCore $core
*/
public function add(PromiseCore $core)
{
foreach ($this->cores as $existed) {
if ($existed === $core) {
return;
}
}
$this->cores[] = $core;
if (null === $this->multiHandle) {
$this->multiHandle = curl_multi_init();
}
curl_multi_add_handle($this->multiHandle, $core->getHandle());
}
/**
* Remove promise from runner
*
* @param PromiseCore $core
*/
public function remove(PromiseCore $core)
{
foreach ($this->cores as $index => $existed) {
if ($existed === $core) {
curl_multi_remove_handle($this->multiHandle, $core->getHandle());
unset($this->cores[$index]);
return;
}
}
}
/**
* Wait for request(s) to be completed.
*
* @param PromiseCore|null $targetCore
*/
public function wait(PromiseCore $targetCore = null)
{
do {
$status = curl_multi_exec($this->multiHandle, $active);
$info = curl_multi_info_read($this->multiHandle);
if (false !== $info) {
$core = $this->findCoreByHandle($info['handle']);
if (null === $core) {
// We have no promise for this handle. Drop it.
curl_multi_remove_handle($this->multiHandle, $info['handle']);
continue;
}
if (CURLE_OK === $info['result']) {
$core->fulfill();
} else {
$error = curl_error($core->getHandle());
$core->reject(new RequestException($error, $core->getRequest()));
}
$this->remove($core);
// This is a promise we are waited for. So exiting wait().
if ($core === $targetCore) {
return;
}
}
} while ($status === CURLM_CALL_MULTI_PERFORM || $active);
}
/**
* Find core by handle.
*
* @param resource $handle
*
* @return PromiseCore|null
*/
private function findCoreByHandle($handle)
{
foreach ($this->cores as $core) {
if ($core->getHandle() === $handle) {
return $core;
}
}
return null;
}
}
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