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<?php |
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namespace mpyw\Co\Internal; |
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use mpyw\Co\Co; |
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use mpyw\Co\Internal\CoOption; |
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use mpyw\Co\CURLException; |
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use React\Promise\Deferred; |
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class CURLPool |
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{ |
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/** |
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* Options. |
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* @var CoOption |
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*/ |
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private $options; |
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/** |
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* cURL multi handle. |
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* @var resource |
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*/ |
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private $mh; |
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/** |
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* cURL handles those have not been dispatched. |
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* @var array |
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*/ |
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private $queue = []; |
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/** |
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* cURL handles those have been already dispatched. |
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* @var array |
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*/ |
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private $added = []; |
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/** |
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* React Deferreds. |
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* @var Deferred |
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*/ |
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private $deferreds = []; |
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/** |
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* Constructor. |
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* Initialize cURL multi handle. |
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* @param CoOption $options |
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*/ |
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public function __construct(CoOption $options) |
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{ |
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$this->options = $options; |
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$this->mh = curl_multi_init(); |
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$flags = (int)$options['pipeline'] + (int)$options['multiplex'] * 2; |
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curl_multi_setopt($this->mh, CURLMOPT_PIPELINING, $flags); |
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} |
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/** |
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* Call curl_multi_add_handle() or push into queue. |
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* @param resource $ch |
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* @param Deferred $deferred |
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*/ |
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public function addOrEnqueue($ch, $deferred = null) |
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{ |
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if (isset($this->added[(string)$ch]) || isset($this->queue[(string)$ch])) { |
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throw new \InvalidArgumentException("The cURL handle is already enqueued: $ch"); |
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} |
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if (count($this->added) >= $this->options['concurrency']) { |
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$this->queue[(string)$ch] = $ch; |
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2 |
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$deferred and $this->deferreds[(string)$ch] = $deferred; |
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return; |
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} |
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$errno = curl_multi_add_handle($this->mh, $ch); |
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4 |
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if ($errno !== CURLM_OK) { |
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$msg = curl_multi_strerror($errno) . ": $ch"; |
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$deferred->reject(new \RuntimeException($msg)); |
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return; |
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} |
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4 |
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$this->added[(string)$ch] = $ch; |
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4 |
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$deferred and $this->deferreds[(string)$ch] = $deferred; |
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} |
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/** |
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* Run curl_multi_exec() loop. |
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*/ |
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public function wait() |
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{ |
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curl_multi_exec($this->mh, $active); // Start requests. |
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do { |
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curl_multi_select($this->mh, $this->options['interval']); // Wait events. |
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curl_multi_exec($this->mh, $active); |
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foreach ($this->readEntries() as $entry) { |
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$r = $entry['result'] === CURLE_OK |
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? curl_multi_getcontent($entry['handle']) |
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: new CURLException(curl_error($entry['handle']), $entry['result'], $entry['handle']); |
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if (isset($this->deferreds[(string)$entry['handle']])) { |
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$deferred = $this->deferreds[(string)$entry['handle']]; |
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unset($this->deferreds[(string)$entry['handle']]); |
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$r instanceof CURLException ? $deferred->reject($r) : $deferred->resolve($r); |
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} |
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} |
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3 |
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} while ($this->added || $this->queue); |
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// All request must be done when reached here. |
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if ($active) { |
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throw new \LogicException('Unreachable statement.'); |
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} |
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} |
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/** |
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* Read completed cURL handles. |
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* @return array |
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*/ |
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3 |
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private function readEntries() |
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3 |
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{ |
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$entries = []; |
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3 |
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while ($entry = curl_multi_info_read($this->mh)) { |
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$entries[] = $entry; |
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} |
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foreach ($entries as $entry) { |
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curl_multi_remove_handle($this->mh, $entry['handle']); |
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unset($this->added[(string)$entry['handle']]); |
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if ($this->queue) { |
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1 |
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$ch = array_shift($this->queue); |
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1 |
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$this->addOrEnqueue($ch); |
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} |
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} |
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return $entries; |
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} |
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} |
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mpyw /
co
Loading history...
PHP has two types of connecting operators (logical operators, and boolean operators):
and&&or||The difference between these is the order in which they are executed. In most cases, you would want to use a boolean operator like
&&, or||.Let’s take a look at a few examples:
Logical Operators are used for Control-Flow
One case where you explicitly want to use logical operators is for control-flow such as this:
Since
dieintroduces problems of its own, f.e. it makes our code hardly testable, and prevents any kind of more sophisticated error handling; you probably do not want to use this in real-world code. Unfortunately, logical operators cannot be combined withthrowat this point:These limitations lead to logical operators rarely being of use in current PHP code.