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Streamer.php
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Streamer.php
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<?php namespace pulyavin\streams;
/**
* Class Streamer
* @package pulyavin\streams
*/
class Streamer
{
/**
* Multi Curl resource handler
* @var array
*/
protected $curl;
/**
* Pool objects of Stream
*
* @var array
*/
protected $streams = [];
public function __construct($streams)
{
if (!function_exists('curl_multi_init')) {
throw new Exception('Curl multi functions are not available', Exception::NOT_AVAILABLE);
}
if (!is_array($streams)) {
$streams = [$streams];
}
// initialization of multi curl
$this->curl = curl_multi_init();
// Set up a scope of new Streams in pool
$this->pushStream($streams);
}
/**
* Set up a new Stream in pool
*
* @param Stream $stream
* @throws Exception
*/
public function setStream(Stream $stream)
{
/** @var $stream Stream */
if (!$stream->isResource()) {
throw new Exception("Is not a valid cURL Handle resource", Exception::INVALID_CURL);
}
curl_multi_add_handle($this->curl, $stream->getResource());
$this->streams[$stream->getResource(true)] = $stream;
}
/**
* Set up a scope of new Streams in pool
*
* @param array $streams
* @throws Exception
*/
public function pushStream(array $streams)
{
foreach ($streams as $stream) {
/** @var $stream Stream */
$this->setStream($stream);
}
}
/**
* Execute multi curl of this Streamer
*
* @return boolean
* @throws Exception
*/
public function exec()
{
if (!$this->isResource()) {
throw new Exception("Is not a valid cURL Multi Handle resource", Exception::INVALID_MULTI_CURL);
}
if (empty($this->streams)) {
throw new Exception("Pull of streams is empty", Exception::PULL_IS_EMPTY);
}
$running = $messages = 0;
do {
// executing...
if (($error = curl_multi_exec($this->curl, $running)) != 0) {
throw new Exception(curl_multi_strerror($error), Exception::MULTI_CURL_ERROR);
}
// we have some completed streams in this iteration
do {
if ($read = curl_multi_info_read($this->curl, $messages)) {
$handle = $read['handle'];
/** @var $stream Stream */
$stream = $this->streams[(int)$handle];
$stream->setResponse($read['result'], curl_multi_getcontent($handle));
}
} while ($messages);
// in god we trust...
usleep(1000);
} while ($running);
// close descriptors
$this->closeResource();
return $this;
}
/**
* Applies the callback to the response of Streams
*
* @param callable $callback
* @return array
*/
public function map(\Closure $callback)
{
$map = [];
foreach ($this->streams as $stream) {
/** @var $stream Stream */
$response = $stream->getResponse();
if (empty($response)) {
continue;
}
$map[] = call_user_func($callback, $response);
}
return $map;
}
/**
* Destroy curl resources
*/
protected function closeResource()
{
if (!$this->isResource()) {
return false;
}
foreach ($this->streams as $stream) {
/** @var $stream Stream */
if ($stream->isResource()) {
curl_multi_remove_handle($this->curl, $stream->getResource());
$stream->closeResource();
}
}
curl_multi_close($this->curl);
return true;
}
/**
* Is it curl resource?
*
* @return bool
*/
public function isResource()
{
return get_resource_type($this->curl) == "curl_multi";
}
public function __destruct()
{
$this->closeResource();
}
public function __clone()
{
throw new Exception("Cloning is prohibited", Exception::CLONING);
}
}