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liveuser |
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<?php
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namespace React\Promise\Timer;
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use React\EventLoop\LoopInterface;
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use React\Promise\CancellablePromiseInterface;
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use React\Promise\PromiseInterface;
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use React\Promise\Promise;
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function timeout(PromiseInterface $promise, $time, LoopInterface $loop)
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{
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// cancelling this promise will only try to cancel the input promise,
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// thus leaving responsibility to the input promise.
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$canceller = null;
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if ($promise instanceof CancellablePromiseInterface || (!\interface_exists('React\Promise\CancellablePromiseInterface') && \method_exists($promise, 'cancel'))) {
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// pass promise by reference to clean reference after cancellation handler
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// has been invoked once in order to avoid garbage references in call stack.
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$canceller = function () use (&$promise) {
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$promise->cancel();
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$promise = null;
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};
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}
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return new Promise(function ($resolve, $reject) use ($loop, $time, $promise) {
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$timer = null;
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$promise = $promise->then(function ($v) use (&$timer, $loop, $resolve) {
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if ($timer) {
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$loop->cancelTimer($timer);
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}
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$timer = false;
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$resolve($v);
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}, function ($v) use (&$timer, $loop, $reject) {
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if ($timer) {
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$loop->cancelTimer($timer);
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}
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$timer = false;
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$reject($v);
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});
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// promise already resolved => no need to start timer
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if ($timer === false) {
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return;
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}
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// start timeout timer which will cancel the input promise
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$timer = $loop->addTimer($time, function () use ($time, &$promise, $reject) {
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$reject(new TimeoutException($time, 'Timed out after ' . $time . ' seconds'));
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// try to invoke cancellation handler of input promise and then clean
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// reference in order to avoid garbage references in call stack.
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if ($promise instanceof CancellablePromiseInterface || (!\interface_exists('React\Promise\CancellablePromiseInterface') && \method_exists($promise, 'cancel'))) {
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$promise->cancel();
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}
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$promise = null;
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});
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}, $canceller);
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}
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function resolve($time, LoopInterface $loop)
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{
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return new Promise(function ($resolve) use ($loop, $time, &$timer) {
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// resolve the promise when the timer fires in $time seconds
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$timer = $loop->addTimer($time, function () use ($time, $resolve) {
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$resolve($time);
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});
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}, function () use (&$timer, $loop) {
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// cancelling this promise will cancel the timer, clean the reference
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// in order to avoid garbage references in call stack and then reject.
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$loop->cancelTimer($timer);
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$timer = null;
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throw new \RuntimeException('Timer cancelled');
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});
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}
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function reject($time, LoopInterface $loop)
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{
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return resolve($time, $loop)->then(function ($time) {
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throw new TimeoutException($time, 'Timer expired after ' . $time . ' seconds');
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});
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}
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