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Edit File : Promise.php \| Size : 8.73 KB
<?php namespace GuzzleHttp\Promise; /** * Promises/A+ implementation that avoids recursion when possible. * * @link https://promisesaplus.com/ / class Promise implements PromiseInterface { private $state = self::PENDING; private $result; private $cancelFn; private $waitFn; private $waitList; private $handlers = []; /* * @param callable $waitFn Fn that when invoked resolves the promise. * @param callable $cancelFn Fn that when invoked cancels the promise. / public function __construct( callable $waitFn = null, callable $cancelFn = null ) { $this->waitFn = $waitFn; $this->cancelFn = $cancelFn; } public function then( callable $onFulfilled = null, callable $onRejected = null ) { if ($this->state === self::PENDING) { $p = new Promise(null, [$this, 'cancel']); $this->handlers[] = [$p, $onFulfilled, $onRejected]; $p->waitList = $this->waitList; $p->waitList[] = $this; return $p; } // Return a fulfilled promise and immediately invoke any callbacks. if ($this->state === self::FULFILLED) { $promise = Create::promiseFor($this->result); return $onFulfilled ? $promise->then($onFulfilled) : $promise; } // It's either cancelled or rejected, so return a rejected promise // and immediately invoke any callbacks. $rejection = Create::rejectionFor($this->result); return $onRejected ? $rejection->then(null, $onRejected) : $rejection; } public function otherwise(callable $onRejected) { return $this->then(null, $onRejected); } public function wait($unwrap = true) { $this->waitIfPending(); if ($this->result instanceof PromiseInterface) { return $this->result->wait($unwrap); } if ($unwrap) { if ($this->state === self::FULFILLED) { return $this->result; } // It's rejected so "unwrap" and throw an exception. throw Create::exceptionFor($this->result); } } public function getState() { return $this->state; } public function cancel() { if ($this->state !== self::PENDING) { return; } $this->waitFn = $this->waitList = null; if ($this->cancelFn) { $fn = $this->cancelFn; $this->cancelFn = null; try { $fn(); } catch (\Throwable $e) { $this->reject($e); } catch (\Exception $e) { $this->reject($e); } } // Reject the promise only if it wasn't rejected in a then callback. /* @psalm-suppress RedundantCondition / if ($this->state === self::PENDING) { $this->reject(new CancellationException('Promise has been cancelled')); } } public function resolve($value) { $this->settle(self::FULFILLED, $value); } public function reject($reason) { $this->settle(self::REJECTED, $reason); } private function settle($state, $value) { if ($this->state !== self::PENDING) { // Ignore calls with the same resolution. if ($state === $this->state && $value === $this->result) { return; } throw $this->state === $state ? new \LogicException("The promise is already {$state}.") : new \LogicException("Cannot change a {$this->state} promise to {$state}"); } if ($value === $this) { throw new \LogicException('Cannot fulfill or reject a promise with itself'); } // Clear out the state of the promise but stash the handlers. $this->state = $state; $this->result = $value; $handlers = $this->handlers; $this->handlers = null; $this->waitList = $this->waitFn = null; $this->cancelFn = null; if (!$handlers) { return; } // If the value was not a settled promise or a thenable, then resolve // it in the task queue using the correct ID. if (!is_object($value) \|\| !method_exists($value, 'then')) { $id = $state === self::FULFILLED ? 1 : 2; // It's a success, so resolve the handlers in the queue. Utils::queue()->add(static function () use ($id, $value, $handlers) { foreach ($handlers as $handler) { self::callHandler($id, $value, $handler); } }); } elseif ($value instanceof Promise && Is::pending($value)) { // We can just merge our handlers onto the next promise. $value->handlers = array_merge($value->handlers, $handlers); } else { // Resolve the handlers when the forwarded promise is resolved. $value->then( static function ($value) use ($handlers) { foreach ($handlers as $handler) { self::callHandler(1, $value, $handler); } }, static function ($reason) use ($handlers) { foreach ($handlers as $handler) { self::callHandler(2, $reason, $handler); } } ); } } /* * Call a stack of handlers using a specific callback index and value. * * @param int $index 1 (resolve) or 2 (reject). * @param mixed $value Value to pass to the callback. * @param array $handler Array of handler data (promise and callbacks). / private static function callHandler($index, $value, array $handler) { /* @var PromiseInterface $promise / $promise = $handler[0]; // The promise may have been cancelled or resolved before placing // this thunk in the queue. if (Is::settled($promise)) { return; } try { if (isset($handler[$index])) { / * If $f throws an exception, then $handler will be in the exception * stack trace. Since $handler contains a reference to the callable * itself we get a circular reference. We clear the $handler * here to avoid that memory leak. / $f = $handler[$index]; unset($handler); $promise->resolve($f($value)); } elseif ($index === 1) { // Forward resolution values as-is. $promise->resolve($value); } else { // Forward rejections down the chain. $promise->reject($value); } } catch (\Throwable $reason) { $promise->reject($reason); } catch (\Exception $reason) { $promise->reject($reason); } } private function waitIfPending() { if ($this->state !== self::PENDING) { return; } elseif ($this->waitFn) { $this->invokeWaitFn(); } elseif ($this->waitList) { $this->invokeWaitList(); } else { // If there's no wait function, then reject the promise. $this->reject('Cannot wait on a promise that has ' . 'no internal wait function. You must provide a wait ' . 'function when constructing the promise to be able to ' . 'wait on a promise.'); } Utils::queue()->run(); /* @psalm-suppress RedundantCondition */ if ($this->state === self::PENDING) { $this->reject('Invoking the wait callback did not resolve the promise'); } } private function invokeWaitFn() { try { $wfn = $this->waitFn; $this->waitFn = null; $wfn(true); } catch (\Exception $reason) { if ($this->state === self::PENDING) { // The promise has not been resolved yet, so reject the promise // with the exception. $this->reject($reason); } else { // The promise was already resolved, so there's a problem in // the application. throw $reason; } } } private function invokeWaitList() { $waitList = $this->waitList; $this->waitList = null; foreach ($waitList as $result) { do { $result->waitIfPending(); $result = $result->result; } while ($result instanceof Promise); if ($result instanceof PromiseInterface) { $result->wait(false); } } } } Back

Edit File : Promise.php | Size : 8.73 KB

<?php

namespace GuzzleHttp\Promise;

/**
 * Promises/A+ implementation that avoids recursion when possible.
 *
 * @link https://promisesaplus.com/
 */
class Promise implements PromiseInterface
{
    private $state = self::PENDING;
    private $result;
    private $cancelFn;
    private $waitFn;
    private $waitList;
    private $handlers = [];

/**
     * @param callable $waitFn   Fn that when invoked resolves the promise.
     * @param callable $cancelFn Fn that when invoked cancels the promise.
     */
    public function __construct(
        callable $waitFn = null,
        callable $cancelFn = null
    ) {
        $this->waitFn = $waitFn;
        $this->cancelFn = $cancelFn;
    }

public function then(
        callable $onFulfilled = null,
        callable $onRejected = null
    ) {
        if ($this->state === self::PENDING) {
            $p = new Promise(null, [$this, 'cancel']);
            $this->handlers[] = [$p, $onFulfilled, $onRejected];
            $p->waitList = $this->waitList;
            $p->waitList[] = $this;
            return $p;
        }

// Return a fulfilled promise and immediately invoke any callbacks.
        if ($this->state === self::FULFILLED) {
            $promise = Create::promiseFor($this->result);
            return $onFulfilled ? $promise->then($onFulfilled) : $promise;
        }

// It's either cancelled or rejected, so return a rejected promise
        // and immediately invoke any callbacks.
        $rejection = Create::rejectionFor($this->result);
        return $onRejected ? $rejection->then(null, $onRejected) : $rejection;
    }

public function otherwise(callable $onRejected)
    {
        return $this->then(null, $onRejected);
    }

public function wait($unwrap = true)
    {
        $this->waitIfPending();

if ($this->result instanceof PromiseInterface) {
            return $this->result->wait($unwrap);
        }
        if ($unwrap) {
            if ($this->state === self::FULFILLED) {
                return $this->result;
            }
            // It's rejected so "unwrap" and throw an exception.
            throw Create::exceptionFor($this->result);
        }
    }

public function getState()
    {
        return $this->state;
    }

public function cancel()
    {
        if ($this->state !== self::PENDING) {
            return;
        }

$this->waitFn = $this->waitList = null;

if ($this->cancelFn) {
            $fn = $this->cancelFn;
            $this->cancelFn = null;
            try {
                $fn();
            } catch (\Throwable $e) {
                $this->reject($e);
            } catch (\Exception $e) {
                $this->reject($e);
            }
        }

// Reject the promise only if it wasn't rejected in a then callback.
        /** @psalm-suppress RedundantCondition */
        if ($this->state === self::PENDING) {
            $this->reject(new CancellationException('Promise has been cancelled'));
        }
    }

public function resolve($value)
    {
        $this->settle(self::FULFILLED, $value);
    }

public function reject($reason)
    {
        $this->settle(self::REJECTED, $reason);
    }

private function settle($state, $value)
    {
        if ($this->state !== self::PENDING) {
            // Ignore calls with the same resolution.
            if ($state === $this->state && $value === $this->result) {
                return;
            }
            throw $this->state === $state
                ? new \LogicException("The promise is already {$state}.")
                : new \LogicException("Cannot change a {$this->state} promise to {$state}");
        }

if ($value === $this) {
            throw new \LogicException('Cannot fulfill or reject a promise with itself');
        }

// Clear out the state of the promise but stash the handlers.
        $this->state = $state;
        $this->result = $value;
        $handlers = $this->handlers;
        $this->handlers = null;
        $this->waitList = $this->waitFn = null;
        $this->cancelFn = null;

if (!$handlers) {
            return;
        }

// If the value was not a settled promise or a thenable, then resolve
        // it in the task queue using the correct ID.
        if (!is_object($value) || !method_exists($value, 'then')) {
            $id = $state === self::FULFILLED ? 1 : 2;
            // It's a success, so resolve the handlers in the queue.
            Utils::queue()->add(static function () use ($id, $value, $handlers) {
                foreach ($handlers as $handler) {
                    self::callHandler($id, $value, $handler);
                }
            });
        } elseif ($value instanceof Promise && Is::pending($value)) {
            // We can just merge our handlers onto the next promise.
            $value->handlers = array_merge($value->handlers, $handlers);
        } else {
            // Resolve the handlers when the forwarded promise is resolved.
            $value->then(
                static function ($value) use ($handlers) {
                    foreach ($handlers as $handler) {
                        self::callHandler(1, $value, $handler);
                    }
                },
                static function ($reason) use ($handlers) {
                    foreach ($handlers as $handler) {
                        self::callHandler(2, $reason, $handler);
                    }
                }
            );
        }
    }

/**
     * Call a stack of handlers using a specific callback index and value.
     *
     * @param int   $index   1 (resolve) or 2 (reject).
     * @param mixed $value   Value to pass to the callback.
     * @param array $handler Array of handler data (promise and callbacks).
     */
    private static function callHandler($index, $value, array $handler)
    {
        /** @var PromiseInterface $promise */
        $promise = $handler[0];

// The promise may have been cancelled or resolved before placing
        // this thunk in the queue.
        if (Is::settled($promise)) {
            return;
        }

try {
            if (isset($handler[$index])) {
                /*
                 * If $f throws an exception, then $handler will be in the exception
                 * stack trace. Since $handler contains a reference to the callable
                 * itself we get a circular reference. We clear the $handler
                 * here to avoid that memory leak.
                 */
                $f = $handler[$index];
                unset($handler);
                $promise->resolve($f($value));
            } elseif ($index === 1) {
                // Forward resolution values as-is.
                $promise->resolve($value);
            } else {
                // Forward rejections down the chain.
                $promise->reject($value);
            }
        } catch (\Throwable $reason) {
            $promise->reject($reason);
        } catch (\Exception $reason) {
            $promise->reject($reason);
        }
    }

private function waitIfPending()
    {
        if ($this->state !== self::PENDING) {
            return;
        } elseif ($this->waitFn) {
            $this->invokeWaitFn();
        } elseif ($this->waitList) {
            $this->invokeWaitList();
        } else {
            // If there's no wait function, then reject the promise.
            $this->reject('Cannot wait on a promise that has '
                . 'no internal wait function. You must provide a wait '
                . 'function when constructing the promise to be able to '
                . 'wait on a promise.');
        }

Utils::queue()->run();

/** @psalm-suppress RedundantCondition */
        if ($this->state === self::PENDING) {
            $this->reject('Invoking the wait callback did not resolve the promise');
        }
    }

private function invokeWaitFn()
    {
        try {
            $wfn = $this->waitFn;
            $this->waitFn = null;
            $wfn(true);
        } catch (\Exception $reason) {
            if ($this->state === self::PENDING) {
                // The promise has not been resolved yet, so reject the promise
                // with the exception.
                $this->reject($reason);
            } else {
                // The promise was already resolved, so there's a problem in
                // the application.
                throw $reason;
            }
        }
    }

private function invokeWaitList()
    {
        $waitList = $this->waitList;
        $this->waitList = null;

foreach ($waitList as $result) {
            do {
                $result->waitIfPending();
                $result = $result->result;
            } while ($result instanceof Promise);

if ($result instanceof PromiseInterface) {
                $result->wait(false);
            }
        }
    }
}

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