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<?php |
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namespace mpyw\Co; |
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use mpyw\Co\Internal\Utils; |
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use mpyw\Co\Internal\CoOption; |
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use mpyw\Co\Internal\GeneratorContainer; |
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use mpyw\Co\Internal\CURLPool; |
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use React\Promise\Deferred; |
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use React\Promise\PromiseInterface; |
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use function React\Promise\all; |
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class Co implements CoInterface |
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{ |
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/** |
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* Instance of myself. |
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* @var Co |
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*/ |
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private static $self; |
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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 request pool object. |
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* @var CURLPool |
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*/ |
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private $pool; |
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/** |
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* Overwrite CoOption default. |
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* @param array $options |
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*/ |
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public static function setDefaultOptions(array $options) |
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{ |
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CoOption::setDefault($options); |
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} |
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/** |
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* Get CoOption default as array. |
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* @return array |
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*/ |
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public static function getDefaultOptions() |
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{ |
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return CoOption::getDefault(); |
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} |
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/** |
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* Wait until value is recursively resolved to return it. |
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* This function call must be atomic. |
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* @param mixed $value |
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* @param array $options |
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* @return mixed |
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*/ |
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public static function wait($value, array $options = []) |
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{ |
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try { |
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if (self::$self) { |
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throw new \BadMethodCallException('Co::wait() is already running. Use Co::async() instead.'); |
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} |
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self::$self = new self; |
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return self::$self->start($value, new CoOption($options)); |
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} finally { |
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self::$self = null; |
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} |
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} |
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/** |
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* Value is recursively resolved, but we never wait it. |
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* This function must be called along with Co::wait(). |
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* @param mixed $value |
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* @param array $options |
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*/ |
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public static function async($value, array $options = []) |
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{ |
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if (!self::$self) { |
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throw new \BadMethodCallException( |
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'Co::async() must be called along with Co::wait(). ' . |
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'This method is mainly expected to be used in CURLOPT_WRITEFUNCTION callback.' |
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); |
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} |
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self::$self->start($value, self::$self->options->reconfigure($options), false); |
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} |
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/** |
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* External instantiation is forbidden. |
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*/ |
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private function __construct() {} |
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/** |
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* Start resovling. |
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* @param mixed $value |
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* @param CoOption $options |
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* @param bool $wait |
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* @param mixed If $wait, return resolved value. |
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*/ |
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private function start($value, CoOption $options, $wait = true) |
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{ |
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$this->options = $options; |
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$this->pool = new CURLPool($options); |
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// If $wait, final result is stored into referenced $return |
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if ($wait) { |
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$deferred = new Deferred; |
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$deferred->promise()->done(function ($r) use (&$return) { |
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$return = $r; |
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}); |
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} |
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// For convenience, all values are wrapped into generator |
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$genfunc = function () use ($value) { |
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yield CoInterface::RETURN_WITH => (yield $value); |
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}; |
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$con = Utils::normalize($genfunc, $options); |
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// We have to provide deferred object only if $wait |
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$this->processGeneratorContainer($con, $wait ? $deferred : null); |
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// We have to wait $return only if $wait |
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if ($wait) { |
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$this->pool->wait(); |
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return $return; |
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} |
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} |
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/** |
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* Handle resolving generators. |
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* @param GeneratorContainer $gc |
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* @param Deferred $deferred |
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*/ |
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private function processGeneratorContainer(GeneratorContainer $gc, Deferred $deferred = null) |
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{ |
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// If generator has no more yields... |
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if (!$gc->valid()) { |
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// If exception has been thrown in generator, we have to propagate it as rejected value |
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if ($gc->thrown()) { |
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$deferred && $deferred->reject($gc->getReturnOrThrown()); |
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return; |
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} |
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// Now we normalize returned value |
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try { |
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$returned = Utils::normalize($gc->getReturnOrThrown(), $gc->getOptions()); |
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$yieldables = Utils::getYieldables($returned); |
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// If normalized value contains yieldables, we have to chain resolver |
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if ($yieldables) { |
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$this->promiseAll($yieldables, true)->then( |
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self::getApplier($returned, $yieldables, [$deferred, 'resolve']), |
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[$deferred, 'reject'] |
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); |
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return; |
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} |
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// Propagate normalized returned value |
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$deferred && $deferred->resolve($returned); |
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} catch (\RuntimeException $e) { |
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// Propagate exception thrown in normalization |
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$deferred && $deferred->reject($e); |
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} |
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return; |
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} |
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// Now we normalize yielded value |
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try { |
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$yielded = Utils::normalize($gc->current(), $gc->getOptions(), $gc->key()); |
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} catch (\RuntimeException $e) { |
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// If exception thrown in normalization... |
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// - If generator accepts exception, we throw it into generator |
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// - If generator does not accept exception, we assume it as non-exception value |
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$gc->throwAcceptable() ? $gc->throw_($e) : $gc->send($e); |
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// Continue |
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$this->processGeneratorContainer($gc, $deferred); |
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return; |
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} |
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// Search yieldables from yielded value |
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$yieldables = Utils::getYieldables($yielded); |
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if (!$yieldables) { |
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// If there are no yieldables, send yielded value back into generator |
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$gc->send($yielded); |
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// Continue |
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$this->processGeneratorContainer($gc, $deferred); |
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return; |
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} |
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// Chain resolver |
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$this->promiseAll($yieldables, $gc->throwAcceptable())->then( |
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self::getApplier($yielded, $yieldables, [$gc, 'send']), |
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[$gc, 'throw_'] |
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)->always(function () use ($gc, $deferred) { |
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// Continue |
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$this->processGeneratorContainer($gc, $deferred); |
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}); |
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} |
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/** |
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* Return function that apply changes in yieldables. |
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* @param mixed $yielded |
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* @param array $yieldables |
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* @param callable $next |
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*/ |
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private static function getApplier($yielded, $yieldables, callable $next) |
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{ |
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return function (array $results) use ($yielded, $yieldables, $next) { |
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foreach ($results as $hash => $resolved) { |
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$current = &$yielded; |
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foreach ($yieldables[$hash]['keylist'] as $key) { |
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$current = &$current[$key]; |
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} |
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$current = $resolved; |
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} |
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$next($yielded); |
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}; |
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} |
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/** |
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* Promise all changes in yieldables are prepared. |
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* @param array $yieldables |
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* @param bool $throw_acceptable |
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* @return PromiseInterface |
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*/ |
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private function promiseAll($yieldables, $throw_acceptable) |
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{ |
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3 |
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$promises = []; |
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foreach ($yieldables as $yieldable) { |
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$dfd = new Deferred; |
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$promises[(string)$yieldable['value']] = $dfd->promise(); |
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// If caller cannot accept exception, |
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// we handle rejected value as resolved. |
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if (!$throw_acceptable) { |
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$original_dfd = $dfd; |
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$dfd = new Deferred; |
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$absorber = function ($any) use ($original_dfd) { |
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$original_dfd->resolve($any); |
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}; |
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$dfd->promise()->then($absorber, $absorber); |
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} |
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// Add or enqueue cURL handles |
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if (Utils::isCurl($yieldable['value'])) { |
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$this->pool->addOrEnqueue($yieldable['value'], $dfd); |
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continue; |
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} |
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// Process generators |
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if (Utils::isGeneratorContainer($yieldable['value'])) { |
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$this->processGeneratorContainer($yieldable['value'], $dfd); |
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continue; |
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} |
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} |
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return all($promises); |
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} |
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} |
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mpyw /
co
