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Edit File : EachPromise.php \| Size : 7.84 KB
<?php namespace GuzzleHttp\Promise; /** * Represents a promise that iterates over many promises and invokes * side-effect functions in the process. / class EachPromise implements PromisorInterface { private $pending = []; /* @var \Iterator\|null / private $iterable; /* @var callable\|int\|null / private $concurrency; /* @var callable\|null / private $onFulfilled; /* @var callable\|null / private $onRejected; /* @var Promise\|null / private $aggregate; /* @var bool\|null / private $mutex; /* * Configuration hash can include the following key value pairs: * * - fulfilled: (callable) Invoked when a promise fulfills. The function * is invoked with three arguments: the fulfillment value, the index * position from the iterable list of the promise, and the aggregate * promise that manages all of the promises. The aggregate promise may * be resolved from within the callback to short-circuit the promise. * - rejected: (callable) Invoked when a promise is rejected. The * function is invoked with three arguments: the rejection reason, the * index position from the iterable list of the promise, and the * aggregate promise that manages all of the promises. The aggregate * promise may be resolved from within the callback to short-circuit * the promise. * - concurrency: (integer) Pass this configuration option to limit the * allowed number of outstanding concurrently executing promises, * creating a capped pool of promises. There is no limit by default. * * @param mixed $iterable Promises or values to iterate. * @param array $config Configuration options / public function __construct($iterable, array $config = []) { $this->iterable = Create::iterFor($iterable); if (isset($config['concurrency'])) { $this->concurrency = $config['concurrency']; } if (isset($config['fulfilled'])) { $this->onFulfilled = $config['fulfilled']; } if (isset($config['rejected'])) { $this->onRejected = $config['rejected']; } } /* @psalm-suppress InvalidNullableReturnType / public function promise() { if ($this->aggregate) { return $this->aggregate; } try { $this->createPromise(); /* @psalm-assert Promise $this->aggregate / $this->iterable->rewind(); if (!$this->checkIfFinished()) { $this->refillPending(); } } catch (\Throwable $e) { /* * @psalm-suppress NullReference * @phpstan-ignore-next-line / $this->aggregate->reject($e); } catch (\Exception $e) { /* * @psalm-suppress NullReference * @phpstan-ignore-next-line / $this->aggregate->reject($e); } /* * @psalm-suppress NullableReturnStatement * @phpstan-ignore-next-line */ return $this->aggregate; } private function createPromise() { $this->mutex = false; $this->aggregate = new Promise(function () { reset($this->pending); // Consume a potentially fluctuating list of promises while // ensuring that indexes are maintained (precluding array_shift). while ($promise = current($this->pending)) { next($this->pending); $promise->wait(); if (Is::settled($this->aggregate)) { return; } } }); // Clear the references when the promise is resolved. $clearFn = function () { $this->iterable = $this->concurrency = $this->pending = null; $this->onFulfilled = $this->onRejected = null; }; $this->aggregate->then($clearFn, $clearFn); } private function refillPending() { if (!$this->concurrency) { // Add all pending promises. while ($this->addPending() && $this->advanceIterator()); return; } // Add only up to N pending promises. $concurrency = is_callable($this->concurrency) ? call_user_func($this->concurrency, count($this->pending)) : $this->concurrency; $concurrency = max($concurrency - count($this->pending), 0); // Concurrency may be set to 0 to disallow new promises. if (!$concurrency) { return; } // Add the first pending promise. $this->addPending(); // Note this is special handling for concurrency=1 so that we do // not advance the iterator after adding the first promise. This // helps work around issues with generators that might not have the // next value to yield until promise callbacks are called. while (--$concurrency && $this->advanceIterator() && $this->addPending()); } private function addPending() { if (!$this->iterable \|\| !$this->iterable->valid()) { return false; } $promise = Create::promiseFor($this->iterable->current()); $key = $this->iterable->key(); // Iterable keys may not be unique, so we add the promises at the end // of the pending array and retrieve the array index being used $this->pending[] = null; end($this->pending); $idx = key($this->pending); $this->pending[$idx] = $promise->then( function ($value) use ($idx, $key) { if ($this->onFulfilled) { call_user_func( $this->onFulfilled, $value, $key, $this->aggregate ); } $this->step($idx); }, function ($reason) use ($idx, $key) { if ($this->onRejected) { call_user_func( $this->onRejected, $reason, $key, $this->aggregate ); } $this->step($idx); } ); return true; } private function advanceIterator() { // Place a lock on the iterator so that we ensure to not recurse, // preventing fatal generator errors. if ($this->mutex) { return false; } $this->mutex = true; try { $this->iterable->next(); $this->mutex = false; return true; } catch (\Throwable $e) { $this->aggregate->reject($e); $this->mutex = false; return false; } catch (\Exception $e) { $this->aggregate->reject($e); $this->mutex = false; return false; } } private function step($idx) { // If the promise was already resolved, then ignore this step. if (Is::settled($this->aggregate)) { return; } unset($this->pending[$idx]); // Only refill pending promises if we are not locked, preventing the // EachPromise to recursively invoke the provided iterator, which // cause a fatal error: "Cannot resume an already running generator" if ($this->advanceIterator() && !$this->checkIfFinished()) { // Add more pending promises if possible. $this->refillPending(); } } private function checkIfFinished() { if (!$this->pending && !$this->iterable->valid()) { // Resolve the promise if there's nothing left to do. $this->aggregate->resolve(null); return true; } return false; } } Back

Edit File : EachPromise.php | Size : 7.84 KB

<?php

namespace GuzzleHttp\Promise;

/**
 * Represents a promise that iterates over many promises and invokes
 * side-effect functions in the process.
 */
class EachPromise implements PromisorInterface
{
    private $pending = [];

/** @var \Iterator|null */
    private $iterable;

/** @var callable|int|null */
    private $concurrency;

/** @var callable|null */
    private $onFulfilled;

/** @var callable|null */
    private $onRejected;

/** @var Promise|null */
    private $aggregate;

/** @var bool|null */
    private $mutex;

/**
     * Configuration hash can include the following key value pairs:
     *
     * - fulfilled: (callable) Invoked when a promise fulfills. The function
     *   is invoked with three arguments: the fulfillment value, the index
     *   position from the iterable list of the promise, and the aggregate
     *   promise that manages all of the promises. The aggregate promise may
     *   be resolved from within the callback to short-circuit the promise.
     * - rejected: (callable) Invoked when a promise is rejected. The
     *   function is invoked with three arguments: the rejection reason, the
     *   index position from the iterable list of the promise, and the
     *   aggregate promise that manages all of the promises. The aggregate
     *   promise may be resolved from within the callback to short-circuit
     *   the promise.
     * - concurrency: (integer) Pass this configuration option to limit the
     *   allowed number of outstanding concurrently executing promises,
     *   creating a capped pool of promises. There is no limit by default.
     *
     * @param mixed $iterable Promises or values to iterate.
     * @param array $config   Configuration options
     */
    public function __construct($iterable, array $config = [])
    {
        $this->iterable = Create::iterFor($iterable);

if (isset($config['concurrency'])) {
            $this->concurrency = $config['concurrency'];
        }

if (isset($config['fulfilled'])) {
            $this->onFulfilled = $config['fulfilled'];
        }

if (isset($config['rejected'])) {
            $this->onRejected = $config['rejected'];
        }
    }

/** @psalm-suppress InvalidNullableReturnType */
    public function promise()
    {
        if ($this->aggregate) {
            return $this->aggregate;
        }

try {
            $this->createPromise();
            /** @psalm-assert Promise $this->aggregate */
            $this->iterable->rewind();
            if (!$this->checkIfFinished()) {
                $this->refillPending();
            }
        } catch (\Throwable $e) {
            /**
             * @psalm-suppress NullReference
             * @phpstan-ignore-next-line
             */
            $this->aggregate->reject($e);
        } catch (\Exception $e) {
            /**
             * @psalm-suppress NullReference
             * @phpstan-ignore-next-line
             */
            $this->aggregate->reject($e);
        }

/**
         * @psalm-suppress NullableReturnStatement
         * @phpstan-ignore-next-line
         */
        return $this->aggregate;
    }

private function createPromise()
    {
        $this->mutex = false;
        $this->aggregate = new Promise(function () {
            reset($this->pending);
            // Consume a potentially fluctuating list of promises while
            // ensuring that indexes are maintained (precluding array_shift).
            while ($promise = current($this->pending)) {
                next($this->pending);
                $promise->wait();
                if (Is::settled($this->aggregate)) {
                    return;
                }
            }
        });

// Clear the references when the promise is resolved.
        $clearFn = function () {
            $this->iterable = $this->concurrency = $this->pending = null;
            $this->onFulfilled = $this->onRejected = null;
        };

$this->aggregate->then($clearFn, $clearFn);
    }

private function refillPending()
    {
        if (!$this->concurrency) {
            // Add all pending promises.
            while ($this->addPending() && $this->advanceIterator());
            return;
        }

// Add only up to N pending promises.
        $concurrency = is_callable($this->concurrency)
            ? call_user_func($this->concurrency, count($this->pending))
            : $this->concurrency;
        $concurrency = max($concurrency - count($this->pending), 0);
        // Concurrency may be set to 0 to disallow new promises.
        if (!$concurrency) {
            return;
        }
        // Add the first pending promise.
        $this->addPending();
        // Note this is special handling for concurrency=1 so that we do
        // not advance the iterator after adding the first promise. This
        // helps work around issues with generators that might not have the
        // next value to yield until promise callbacks are called.
        while (--$concurrency
            && $this->advanceIterator()
            && $this->addPending());
    }

private function addPending()
    {
        if (!$this->iterable || !$this->iterable->valid()) {
            return false;
        }

$promise = Create::promiseFor($this->iterable->current());
        $key = $this->iterable->key();

// Iterable keys may not be unique, so we add the promises at the end
        // of the pending array and retrieve the array index being used
        $this->pending[] = null;
        end($this->pending);
        $idx = key($this->pending);

$this->pending[$idx] = $promise->then(
            function ($value) use ($idx, $key) {
                if ($this->onFulfilled) {
                    call_user_func(
                        $this->onFulfilled,
                        $value,
                        $key,
                        $this->aggregate
                    );
                }
                $this->step($idx);
            },
            function ($reason) use ($idx, $key) {
                if ($this->onRejected) {
                    call_user_func(
                        $this->onRejected,
                        $reason,
                        $key,
                        $this->aggregate
                    );
                }
                $this->step($idx);
            }
        );

return true;
    }

private function advanceIterator()
    {
        // Place a lock on the iterator so that we ensure to not recurse,
        // preventing fatal generator errors.
        if ($this->mutex) {
            return false;
        }

$this->mutex = true;

try {
            $this->iterable->next();
            $this->mutex = false;
            return true;
        } catch (\Throwable $e) {
            $this->aggregate->reject($e);
            $this->mutex = false;
            return false;
        } catch (\Exception $e) {
            $this->aggregate->reject($e);
            $this->mutex = false;
            return false;
        }
    }

private function step($idx)
    {
        // If the promise was already resolved, then ignore this step.
        if (Is::settled($this->aggregate)) {
            return;
        }

unset($this->pending[$idx]);

// Only refill pending promises if we are not locked, preventing the
        // EachPromise to recursively invoke the provided iterator, which
        // cause a fatal error: "Cannot resume an already running generator"
        if ($this->advanceIterator() && !$this->checkIfFinished()) {
            // Add more pending promises if possible.
            $this->refillPending();
        }
    }

private function checkIfFinished()
    {
        if (!$this->pending && !$this->iterable->valid()) {
            // Resolve the promise if there's nothing left to do.
            $this->aggregate->resolve(null);
            return true;
        }

return false;
    }
}

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