logicalsteps /
async
| Total Complexity | 123 |
| Total Lines | 546 |
| Duplicated Lines | 0 % |
| Changes | 45 | ||
| Bugs | 3 | Features | 3 |
Complex classes like Async often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Async, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 42 | class Async |
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| 43 | { |
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| 44 | const PROMISE_REACT = 'React\Promise\PromiseInterface'; |
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| 45 | const PROMISE_AMP = 'Amp\Promise'; |
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| 46 | const PROMISE_GUZZLE = 'GuzzleHttp\Promise\PromiseInterface'; |
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| 47 | const PROMISE_HTTP = 'Http\Promise\Promise'; |
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| 48 | |||
| 49 | /** @var string action to return a promise instead of awaiting the response of the process. */ |
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| 50 | const promise = 'promise'; |
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| 51 | /** @var string action to run current process side by side with the remainder of the process. */ |
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| 52 | const parallel = 'parallel'; |
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| 53 | /** @var string action to await for all parallel processes previously to finish. */ |
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| 54 | const all = 'all'; |
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| 55 | /** @var string action to await for current processes to finish. this is the default action. */ |
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| 56 | const await = 'await'; |
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| 57 | /** @var string action to run current process after finished executing the function. */ |
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| 58 | const later = 'later'; |
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| 59 | |||
| 60 | const ACTIONS = [self::await, self::parallel, self::all, self::promise, self::later]; |
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| 61 | |||
| 62 | public static $knownPromises = [ |
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| 63 | self::PROMISE_REACT, |
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| 64 | self::PROMISE_AMP, |
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| 65 | self::PROMISE_GUZZLE, |
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| 66 | self::PROMISE_HTTP, |
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| 67 | ]; |
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| 68 | |||
| 69 | /** |
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| 70 | * @var LoggerInterface |
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| 71 | */ |
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| 72 | protected $logger; |
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| 73 | /** |
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| 74 | * @var bool |
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| 75 | */ |
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| 76 | public $waitForGuzzleAndHttplug = true; |
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| 77 | |||
| 78 | /** |
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| 79 | * @var bool |
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| 80 | */ |
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| 81 | protected $parallelGuzzleLoading = false; |
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| 82 | |||
| 83 | protected $guzzlePromises = []; |
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| 84 | |||
| 85 | public function __construct(LoggerInterface $logger = null) |
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| 86 | { |
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| 87 | if ($logger) { |
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| 88 | $this->logger = $logger; |
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| 89 | } |
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| 90 | } |
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| 91 | |||
| 92 | public function __call($name, $arguments) |
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| 137 | } |
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| 138 | |||
| 139 | public static function __callStatic($name, $arguments) |
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| 140 | { |
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| 141 | if (empty($arguments) && in_array($name, self::ACTIONS)) { |
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| 142 | return $name; |
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| 143 | } |
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| 144 | static $instance; |
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| 145 | if (!$instance) { |
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| 146 | $instance = new static(); |
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| 147 | } |
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| 148 | return $instance->__call($name, $arguments); |
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| 149 | } |
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| 150 | |||
| 151 | /** |
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| 152 | * Throws specified or subclasses of specified exception inside the generator class so that it can be handled. |
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| 153 | * |
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| 154 | * @param string $throwable |
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| 155 | * @return string command |
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| 156 | * |
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| 157 | * @throws TypeError when given value is not a valid exception |
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| 158 | */ |
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| 159 | public static function throw(string $throwable): string |
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| 160 | { |
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| 161 | if (is_a($throwable, Throwable::class, true)) { |
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| 162 | return __FUNCTION__ . ':' . $throwable; |
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| 163 | } |
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| 164 | throw new TypeError('Invalid value for throwable, it must extend Throwable class'); |
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| 165 | } |
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| 166 | |||
| 167 | protected function _awaitAll(array $processes, callable $callback): void |
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| 195 | } |
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| 196 | |||
| 197 | /** |
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| 198 | * Sets a logger instance on the object. |
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| 199 | * |
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| 200 | * @param LoggerInterface $logger |
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| 201 | * |
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| 202 | * @return void |
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| 203 | */ |
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| 204 | protected function _setLogger(LoggerInterface $logger) |
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| 205 | { |
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| 206 | $this->logger = $logger; |
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| 207 | } |
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| 208 | |||
| 209 | private function makePromise() |
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| 210 | { |
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| 211 | $resolver = $rejector = null; |
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| 212 | $promise = new Promise(function ($resolve, $reject, $notify) use (&$resolver, &$rejector) { |
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| 213 | $resolver = $resolve; |
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| 214 | $rejector = $reject; |
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| 215 | }); |
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| 216 | return [$promise, $resolver, $rejector]; |
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| 217 | } |
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| 218 | |||
| 219 | protected function _wait($process, $loop = null) |
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| 220 | { |
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| 221 | if ($this->logger) { |
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| 222 | $this->logger->info('start'); |
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| 223 | } |
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| 224 | $waiting = true; |
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| 225 | $result = null; |
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| 226 | $exception = null; |
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| 227 | $isRejected = false; |
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| 228 | |||
| 229 | $callback = function ($error = null, $r = null) use (&$result, &$waiting, &$isRejected, &$exception, $loop) { |
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| 230 | $waiting = false; |
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| 231 | if ($loop) { |
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| 232 | $loop->stop(); |
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| 233 | } |
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| 234 | if ($error) { |
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| 235 | $isRejected = true; |
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| 236 | $exception = $error; |
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| 237 | return; |
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| 238 | } |
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| 239 | $result = $r; |
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| 240 | }; |
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| 241 | $this->_handle($process, $callback, -1); |
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| 242 | while ($waiting) { |
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| 243 | if ($loop) { |
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| 244 | $loop->run(); |
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| 245 | } |
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| 246 | } |
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| 247 | if ($this->logger) { |
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| 248 | $this->logger->info('end'); |
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| 249 | } |
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| 250 | if ($isRejected) { |
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| 251 | if (!$exception instanceof \Exception) { |
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| 252 | $exception = new \UnexpectedValueException( |
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| 253 | 'process failed with ' . (is_object($exception) ? get_class($exception) : gettype($exception)) |
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| 254 | ); |
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| 255 | } |
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| 256 | throw $exception; |
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| 257 | } |
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| 258 | |||
| 259 | return $result; |
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| 260 | } |
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| 261 | |||
| 262 | protected function _handle($process, callable $callback, int $depth = 0): void |
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| 263 | { |
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| 264 | $arguments = []; |
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| 265 | $func = []; |
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| 266 | if (is_array($process) && count($process) > 1) { |
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| 267 | $copy = $process; |
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| 268 | $func[] = array_shift($copy); |
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| 269 | if (is_callable($func[0])) { |
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| 270 | $func = $func[0]; |
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| 271 | } else { |
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| 272 | $func[] = array_shift($copy); |
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| 273 | } |
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| 274 | $arguments = $copy; |
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| 275 | } else { |
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| 276 | $func = $process; |
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| 277 | } |
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| 278 | if (is_callable($func)) { |
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| 279 | $this->_handleCallback($func, $arguments, $callback, $depth); |
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| 280 | } elseif ($process instanceof Generator) { |
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| 281 | $this->_handleGenerator($process, $callback, 1 + $depth); |
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| 282 | } elseif (is_object($process) && $implements = array_intersect(class_implements($process), |
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| 283 | Async::$knownPromises)) { |
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| 284 | $this->_handlePromise($process, array_shift($implements), $callback, $depth); |
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| 285 | } else { |
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| 286 | $callback(null, $process); |
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| 287 | } |
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| 288 | } |
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| 289 | |||
| 290 | |||
| 291 | protected function _handleCallback(callable $callable, array $parameters, callable $callback, int $depth = 0) |
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| 292 | { |
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| 293 | $this->logCallback($callable, $parameters, $depth); |
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| 294 | try { |
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| 295 | if (is_array($callable)) { |
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| 296 | $rf = new ReflectionMethod($callable[0], $callable[1]); |
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| 297 | } elseif (is_string($callable)) { |
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| 298 | $rf = new ReflectionFunction($callable); |
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| 299 | } elseif (is_a($callable, 'Closure') || is_callable($callable, '__invoke')) { |
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| 300 | $ro = new ReflectionObject($callable); |
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| 301 | $rf = $ro->getMethod('__invoke'); |
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| 302 | } |
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| 303 | $current = count($parameters); |
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| 304 | $total = $rf->getNumberOfParameters(); |
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| 305 | $ps = $rf->getParameters(); |
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| 306 | if ($current + 1 < $total) { |
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| 307 | for ($i = $current; $i < $total - 1; $i++) { |
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| 308 | $parameters[$i] = $ps[$i]->isDefaultValueAvailable() ? $ps[$i]->getDefaultValue() : null; |
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| 309 | } |
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| 310 | } |
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| 311 | } catch (ReflectionException $e) { |
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| 312 | //ignore |
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| 313 | } |
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| 314 | $parameters[] = $callback; |
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| 315 | call_user_func_array($callable, $parameters); |
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| 316 | } |
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| 317 | |||
| 318 | protected function _handleGenerator(Generator $flow, callable $callback, int $depth = 0) |
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| 319 | { |
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| 320 | $this->logGenerator($flow, $depth - 1); |
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| 321 | try { |
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| 322 | if (!$flow->valid()) { |
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| 323 | $callback(null, $flow->getReturn()); |
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| 324 | if (!empty($flow->later)) { |
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| 325 | $this->_awaitAll($flow->later, function ($error = null, $results = null) { |
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| 326 | }); |
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| 327 | unset($flow->later); |
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| 328 | } |
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| 329 | return; |
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| 330 | } |
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| 331 | $value = $flow->current(); |
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| 332 | $actions = $this->parse($flow->key() ?: Async::await); |
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| 333 | $next = function ($error = null, $result = null) use ($flow, $actions, $callback, $depth) { |
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| 334 | $value = $error ?: $result; |
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| 335 | if ($value instanceof Throwable) { |
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| 336 | if (isset($actions['throw']) && is_a($value, $actions['throw'])) { |
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| 337 | /** @scrutinizer ignore-call */ |
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| 338 | $flow->throw($value); |
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| 339 | $this->_handleGenerator($flow, $callback, $depth); |
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| 340 | return; |
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| 341 | } |
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| 342 | $callback($value, null); |
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| 343 | return; |
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| 344 | } |
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| 345 | $flow->send($value); |
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| 346 | $this->_handleGenerator($flow, $callback, $depth); |
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| 347 | }; |
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| 348 | if (key_exists(self::later, $actions)) { |
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| 349 | if (!isset($flow->later)) { |
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| 350 | $flow->later = []; |
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| 351 | } |
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| 352 | if ($this->logger) { |
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| 353 | $this->logger->info('later task scheduled', compact('depth')); |
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| 354 | } |
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| 355 | $flow->later[] = $value; |
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| 356 | return $next(null, $value); |
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| 357 | } |
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| 358 | if (key_exists(self::parallel, $actions)) { |
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| 359 | if (!isset($flow->parallel)) { |
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| 360 | $flow->parallel = []; |
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| 361 | } |
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| 362 | $flow->parallel[] = $value; |
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| 363 | if (!isset($this->action)) { |
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| 364 | $this->action = []; |
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| 365 | } |
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| 366 | $this->action[] = self::parallel; |
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| 367 | return $next(null, $value); |
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| 368 | } |
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| 369 | if (key_exists(self::all, $actions)) { |
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| 370 | $tasks = Async::parallel === $value && isset($flow->parallel) ? $flow->parallel : $value; |
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| 371 | unset($flow->parallel); |
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| 372 | if (is_array($tasks) && count($tasks)) { |
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| 373 | if ($this->logger) { |
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| 374 | $this->logger->info( |
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| 375 | sprintf("all {%d} tasks awaited.", count($tasks)), |
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| 376 | compact('depth') |
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| 377 | ); |
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| 378 | } |
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| 379 | return $this->_awaitAll($tasks, $next); |
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| 380 | } |
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| 381 | return $next(null, []); |
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| 382 | } |
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| 383 | $this->_handle($value, $next, $depth); |
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| 384 | } catch (Throwable $throwable) { |
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| 385 | $callback($throwable, null); |
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| 386 | } |
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| 387 | } |
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| 388 | |||
| 389 | /** |
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| 390 | * Handle known promise interfaces |
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| 391 | * |
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| 392 | * @param \React\Promise\PromiseInterface|\GuzzleHttp\Promise\PromiseInterface|\Amp\Promise|\Http\Promise\Promise $knownPromise |
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| 393 | * @param string $interface |
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| 394 | * @param callable $callback |
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| 395 | * @param int $depth |
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| 396 | * @return void |
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| 397 | */ |
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| 398 | protected function _handlePromise($knownPromise, string $interface, callable $callback, int $depth = 0) |
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| 399 | { |
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| 400 | $this->logPromise($knownPromise, $interface, $depth); |
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| 401 | $resolver = function ($result) use ($callback) { |
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| 402 | $callback(null, $result); |
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| 403 | }; |
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| 404 | $rejector = function ($error) use ($callback) { |
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| 405 | $callback($error, null); |
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| 406 | }; |
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| 407 | try { |
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| 408 | switch ($interface) { |
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| 409 | case static::PROMISE_REACT: |
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| 410 | $knownPromise->then($resolver, $rejector); |
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| 411 | break; |
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| 412 | case static::PROMISE_GUZZLE: |
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| 413 | $knownPromise->then($resolver, $rejector); |
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| 414 | if ($this->waitForGuzzleAndHttplug) { |
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| 415 | if ($this->parallelGuzzleLoading) { |
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| 416 | $this->guzzlePromises[] = $knownPromise; |
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| 417 | } else { |
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| 418 | $knownPromise->wait(false); |
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| 419 | } |
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| 420 | } |
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| 421 | break; |
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| 422 | case static::PROMISE_HTTP: |
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| 423 | $knownPromise->then($resolver, $rejector); |
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| 424 | if ($this->waitForGuzzleAndHttplug) { |
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| 425 | $knownPromise->wait(false); |
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| 426 | } |
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| 427 | break; |
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| 428 | case static::PROMISE_AMP: |
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| 429 | $knownPromise->onResolve( |
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| 430 | function ($error = null, $result = null) use ($resolver, $rejector) { |
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| 431 | $error ? $rejector($error) : $resolver($result); |
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| 432 | }); |
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| 433 | break; |
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| 434 | } |
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| 435 | } catch (\Exception $e) { |
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| 436 | $rejector($e); |
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| 437 | } |
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| 438 | } |
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| 439 | |||
| 440 | private function handleCommands(Generator $flow, &$value, callable $callback, int $depth): bool |
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| 441 | { |
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| 442 | $commands = $this->parse($flow->key()); |
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| 443 | if ($value instanceof Throwable) { |
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| 444 | if (isset($commands['throw']) && is_a($value, $commands['throw'])) { |
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| 445 | $flow->throw($value); |
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| 446 | $this->_handleGenerator($flow, $callback, $depth); |
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| 447 | return true; //stop |
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| 448 | } |
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| 449 | $callback($value, null); |
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| 450 | return true; //stop |
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| 451 | } |
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| 452 | if (isset($commands[self::parallel])) { |
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| 453 | if (!isset($flow->parallel)) { |
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| 454 | $flow->parallel = []; |
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| 455 | } |
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| 456 | $flow->parallel [] = $value; |
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| 457 | return false; //continue |
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| 458 | } |
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| 459 | |||
| 460 | if (isset($commands[self::all])) { |
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| 461 | if (!isset($flow->parallel)) { |
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| 462 | $callback(null, []); |
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| 463 | return true; //stop |
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| 464 | } |
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| 465 | $this->_awaitAll( |
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| 466 | $flow->parallel, |
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| 467 | function ($error = null, $all = null) use ($flow, $callback, $depth) { |
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| 468 | if ($error) { |
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| 469 | $callback($error, false); |
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| 470 | return; |
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| 471 | } |
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| 472 | $flow->send($all); |
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| 473 | $this->_handleGenerator($flow, $callback, $depth); |
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| 474 | } |
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| 475 | ); |
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| 476 | return true; //stop |
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| 477 | } |
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| 478 | |||
| 479 | return false; //continue |
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| 480 | } |
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| 481 | |||
| 482 | private function parse(string $command): array |
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| 483 | { |
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| 484 | $arr = []; |
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| 485 | if (strlen($command)) { |
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| 486 | parse_str(str_replace(['|', ':'], ['&', '='], $command), $arr); |
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| 487 | } |
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| 488 | return $arr; |
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| 489 | } |
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| 490 | |||
| 491 | private function action() |
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| 497 | } |
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| 498 | |||
| 499 | private function logCallback(callable $callable, array $parameters, int $depth = 0) |
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| 500 | { |
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| 501 | if ($depth < 0 || !$this->logger) { |
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| 502 | return; |
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| 503 | } |
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| 504 | if (is_array($callable)) { |
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| 505 | $name = $callable[0]; |
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| 506 | if (is_object($name)) { |
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| 507 | $name = '$' . lcfirst(get_class($name)) . '->' . $callable[1]; |
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| 508 | } else { |
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| 509 | $name .= '::' . $callable[1]; |
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| 510 | } |
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| 511 | |||
| 512 | } else { |
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| 513 | if (is_string($callable)) { |
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| 514 | $name = $callable; |
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| 515 | } elseif ($callable instanceof Closure) { |
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| 516 | $name = '$closure'; |
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| 517 | } else { |
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| 518 | $name = '$callable'; |
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| 519 | } |
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| 520 | } |
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| 521 | $this->logger->info( |
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| 522 | sprintf("%s %s%s", $this->action(), $name, $this->format($parameters)), |
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| 523 | compact('depth') |
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| 524 | ); |
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| 525 | } |
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| 526 | |||
| 527 | private function logPromise(/** @scrutinizer ignore-unused */ $promise, string $interface, int $depth) |
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| 528 | { |
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| 529 | if ($depth < 0 || !$this->logger) { |
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| 530 | return; |
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| 531 | } |
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| 532 | $type = 'unknown'; |
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| 533 | switch ($interface) { |
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| 534 | case static::PROMISE_REACT: |
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| 535 | $type = 'react'; |
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| 536 | break; |
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| 537 | case static::PROMISE_GUZZLE: |
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| 538 | $type = 'guzzle'; |
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| 539 | break; |
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| 540 | case static::PROMISE_HTTP: |
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| 541 | $type = 'httplug'; |
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| 542 | break; |
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| 543 | case static::PROMISE_AMP: |
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| 544 | $type = 'amp'; |
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| 545 | break; |
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| 546 | } |
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| 547 | $this->logger->info( |
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| 548 | sprintf("%s \$%sPromise;", $this->action(), $type), |
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| 549 | compact('depth') |
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| 550 | ); |
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| 551 | } |
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| 552 | |||
| 553 | private function logGenerator(Generator $generator, int $depth = 0) |
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| 560 | } |
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| 561 | |||
| 562 | private function format($parameters) |
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| 563 | { |
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| 564 | return '(' . substr(json_encode($parameters), 1, -1) . ');'; |
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| 565 | } |
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| 566 | |||
| 567 | private function logReflectionFunction(ReflectionFunctionAbstract $function, int $depth = 0) |
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| 568 | { |
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| 569 | if ($function instanceof ReflectionMethod) { |
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| 570 | $name = $function->getDeclaringClass()->getShortName(); |
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| 571 | if ($function->isStatic()) { |
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| 572 | $name .= '::' . $function->name; |
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| 573 | } else { |
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| 588 | ); |
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| 589 | } |
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| 590 | } |
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| 591 |
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