mirror of
https://github.com/danog/amp.git
synced 2024-12-16 03:17:12 +01:00
733 lines
24 KiB
PHP
733 lines
24 KiB
PHP
<?php
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namespace Amp;
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/**
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* Get the default event reactor instance
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*
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* @param \Amp\Reactor $assignReactor Optionally specify a new default event reactor instance
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* @return \Amp\Reactor Returns the default reactor instance
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*/
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function reactor(Reactor $assignReactor = null) {
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static $reactor;
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if ($assignReactor) {
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return ($reactor = $assignReactor);
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} elseif ($reactor) {
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return $reactor;
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} elseif (\extension_loaded("uv")) {
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return ($reactor = new UvReactor);
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} elseif (\extension_loaded("ev")) {
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return ($reactor = new EvReactor);
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} elseif (\extension_loaded("libevent")) {
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return ($reactor = new LibeventReactor);
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} else {
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return ($reactor = new NativeReactor);
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}
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}
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/**
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* Start the default event reactor and assume program flow control
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*
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* This is a shortcut function for invoking Reactor::run() on the global
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* default event reactor.
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*
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* @param callable $onStart An optional callback to invoke immediately when the Reactor starts
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* @return void
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*/
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function run(callable $onStart = null) {
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reactor()->run($onStart);
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}
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/**
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* Stop the default event reactor and return program flow control
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*
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* This is a shortcut function for invoking Reactor::stop() on the global
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* default event reactor.
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*
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* @return void
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*/
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function stop() {
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reactor()->stop();
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}
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/**
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* Flatten an array of promises into a single promise
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*
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* Upon resolution the returned promise's $result parameter is set to an array
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* whose keys match the original input array and whose values match the individual
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* resolution results of its component promises.
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*
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* If any one of the Promises fails the resulting Promise will immediately fail.
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*
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* @param array An array of promises to flatten into a single promise
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* @return \Amp\Promise
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*/
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function all(array $promises) {
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if (empty($promises)) {
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return new Success([]);
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}
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$struct = new \StdClass;
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$struct->remaining = count($promises);
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$struct->results = [];
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$struct->promisor = new Deferred;
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$onResolve = function($error, $result, $cbData) {
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list($struct, $key) = $cbData;
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if (empty($struct->remaining)) {
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// If the promisor already resolved we don't need to bother
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return;
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}
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if ($error) {
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$struct->results = null;
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$struct->remaining = 0;
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$struct->promisor->fail($error);
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return;
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}
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$struct->results[$key] = $result;
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if (--$struct->remaining === 0) {
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$struct->promisor->succeed($struct->results);
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}
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};
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foreach ($promises as $key => $promise) {
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if ($promise instanceof Promise) {
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$promise->when($onResolve, [$struct, $key]);
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} else {
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$struct->results[$key] = $promise;
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if (--$struct->remaining === 0) {
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$struct->promisor->succeed($struct->results);
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}
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}
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}
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return $struct->promisor->promise();
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}
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/**
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* Resolves with a two-item array delineating successful and failed Promise results.
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*
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* The resulting Promise will only fail if ALL of the Promise values fail or if the
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* Promise array is empty.
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*
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* The resulting Promise is resolved with an indexed two-item array of the following form:
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*
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* [$arrayOfFailures, $arrayOfSuccesses]
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*
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* The individual keys in the resulting arrays are preserved from the initial Promise array
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* passed to the function for evaluation.
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*
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* @param array An array of promises to flatten into a single promise
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* @return \Amp\Promise
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*/
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function some(array $promises) {
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if (empty($promises)) {
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return new Failure(new \LogicException(
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"No promises or values provided for resolution"
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));
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}
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$struct = new \StdClass;
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$struct->remaining = count($promises);
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$struct->errors = [];
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$struct->results = [];
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$struct->promisor = new Deferred;
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$onResolve = function($error, $result, $cbData) {
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list($struct, $key) = $cbData;
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if ($error) {
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$struct->errors[$key] = $error;
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} else {
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$struct->results[$key] = $result;
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}
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if (--$struct->remaining) {
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return;
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}
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if (empty($struct->results)) {
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array_unshift($struct->errors, "All promises passed to Amp\some() failed");
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$struct->promisor->fail(new \RuntimeException(
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implode("\n\n", $struct->errors)
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));
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} else {
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$struct->promisor->succeed([$struct->errors, $struct->results]);
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}
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};
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foreach ($promises as $key => $promise) {
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if ($promise instanceof Promise) {
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$promise->when($onResolve, [$struct, $key]);
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} else {
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$struct->results[$key] = $promise;
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if (--$struct->remaining === 0) {
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$struct->promisor->succeed([$struct->errors, $struct->results]);
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}
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}
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}
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return $struct->promisor->promise();
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}
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/**
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* Resolves with a two-item array delineating successful and failed Promise results.
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*
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* This function is the same as some() with the notable exception that it will never fail even
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* if all promises in the array resolve unsuccessfully.
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*
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* @param array An array of promises to flatten into a single promise
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* @return \Amp\Promise
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*/
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function any(array $promises) {
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if (empty($promises)) {
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return new Success([[], []]);
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}
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$struct = new \StdClass;
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$struct->remaining = count($promises);
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$struct->errors = [];
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$struct->results = [];
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$struct->promisor = new Deferred;
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$onResolve = function($error, $result, $cbData) {
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list($struct, $key) = $cbData;
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if ($error) {
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$struct->errors[$key] = $error;
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} else {
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$struct->results[$key] = $result;
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}
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if (--$struct->remaining === 0) {
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$struct->promisor->succeed([$struct->errors, $struct->results]);
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}
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};
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foreach ($promises as $key => $promise) {
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if ($promise instanceof Promise) {
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$promise->when($onResolve, [$struct, $key]);
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} else {
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$struct->results[$key] = $promise;
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if (--$struct->remaining === 0) {
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$struct->promisor->succeed([$struct->errors, $struct->results]);
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}
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}
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}
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return $struct->promisor->promise();
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}
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/**
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* Resolves with the first successful Promise value. The resulting Promise will only fail if all
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* Promise values in the group fail or if the initial Promise array is empty.
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*
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* @param array An array of promises to flatten into a single promise
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* @return \Amp\Promise
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*/
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function first(array $promises) {
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if (empty($promises)) {
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return new Failure(new \LogicException(
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"No promises or values provided"
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));
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}
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$struct = new \StdClass;
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$struct->remaining = count($promises);
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$struct->promisor = new Deferred;
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$onResolve = function($error, $result, $cbData) {
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list($struct, $key) = $cbData;
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if (empty($struct->remaining)) {
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return;
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}
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if (empty($error)) {
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$struct->remaining = 0;
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$struct->promisor->succeed($result);
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return;
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}
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if (--$struct->remaining === 0) {
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$struct->promisor->fail(new \RuntimeException(
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"All promises failed"
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));
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}
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};
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foreach ($promises as $key => $promise) {
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if ($promise instanceof Promise) {
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$promise->when($onResolve, [$struct, $key]);
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} else {
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$struct->remaining = 0;
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$struct->promisor->succeed($promise);
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break;
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}
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}
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return $struct->promisor->promise();
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}
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/**
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* Map promised deferred values using the specified functor
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*
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* @param array An array of promises whose values -- once resoved -- will be mapped by the functor
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* @param callable $functor The mapping function to apply to eventual promise results
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* @return \Amp\Promise
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*/
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function map(array $promises, callable $functor) {
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if (empty($promises)) {
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return new Success([]);
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}
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$struct = new \StdClass;
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$struct->remaining = count($promises);
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$struct->results = [];
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$struct->promisor = new Deferred;
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$struct->functor = $functor;
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$onResolve = function($error, $result, $cbData) {
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list($struct, $key) = $cbData;
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if (empty($struct->remaining)) {
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// If the promisor already resolved we don't need to bother
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return;
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}
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if ($error) {
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$struct->results = null;
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$struct->remaining = 0;
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$struct->promisor->fail($error);
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return;
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}
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$struct->remaining--;
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try {
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$struct->results[$key] = \call_user_func($struct->functor, $result);
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if ($struct->remaining === 0) {
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$struct->promisor->succeed($struct->results);
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}
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} catch (\Throwable $e) {
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// @TODO Remove coverage ignore block once PHP5 support is no longer required
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// @codeCoverageIgnoreStart
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$struct->remaining = 0;
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$struct->promisor->fail($e);
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// @codeCoverageIgnoreEnd
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} catch (\Exception $e) {
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// @TODO Remove this catch block once PHP5 support is no longer required
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$struct->remaining = 0;
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$struct->promisor->fail($e);
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}
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};
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foreach ($promises as $key => $promise) {
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if ($promise instanceof Promise) {
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$promise->when($onResolve, [$struct, $key]);
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} else {
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$struct->remaining--;
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try {
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$struct->results[$key] = \call_user_func($struct->functor, $promise);
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} catch (\Throwable $e) {
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// @TODO Remove coverage ignore block once PHP5 support is no longer required
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// @codeCoverageIgnoreStart
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$struct->remaining = 0;
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$struct->promisor->fail($e);
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// @codeCoverageIgnoreEnd
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} catch (\Exception $e) {
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// @TODO Remove this catch block once PHP5 support is no longer required
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$struct->remaining = 0;
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$struct->promisor->fail($e);
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}
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if ($struct->remaining === 0) {
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break;
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}
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}
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}
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return $struct->promisor->promise();
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}
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/**
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* Filter deferred values using the specified functor
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*
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* If the functor returns a truthy value the resolved promise result is retained, otherwise it is
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* discarded. Array keys are retained for any results not filtered out by the functor.
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*
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* @param array An array of promises whose values -- once resoved -- will be filtered by the functor
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* @param callable $functor The filtering function to apply to eventual promise results
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* @return \Amp\Promise
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*/
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function filter(array $promises, callable $functor) {
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if (empty($promises)) {
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return new Success([]);
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}
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$struct = new \StdClass;
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$struct->remaining = count($promises);
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$struct->results = [];
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$struct->promisor = new Deferred;
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$struct->functor = $functor;
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$onResolve = function($error, $result, $cbData) {
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list($struct, $key) = $cbData;
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if (empty($struct->remaining)) {
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// If the promisor already resolved we don't need to bother
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return;
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}
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if ($error) {
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$struct->results = null;
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$struct->remaining = 0;
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$struct->promisor->fail($error);
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return;
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}
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$struct->remaining--;
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try {
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if (\call_user_func($struct->functor, $result)) {
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$struct->results[$key] = $result;
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}
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if ($struct->remaining === 0) {
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$struct->promisor->succeed($struct->results);
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}
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} catch (\Throwable $e) {
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// @TODO Remove coverage ignore block once PHP5 support is no longer required
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// @codeCoverageIgnoreStart
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$struct->remaining = 0;
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$struct->promisor->fail($e);
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// @codeCoverageIgnoreEnd
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} catch (\Exception $e) {
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// @TODO Remove this catch block once PHP5 support is no longer required
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$struct->remaining = 0;
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$struct->promisor->fail($e);
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}
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};
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foreach ($promises as $key => $promise) {
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if ($promise instanceof Promise) {
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$promise->when($onResolve, [$struct, $key]);
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} else {
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$struct->remaining--;
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try {
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if (\call_user_func($struct->functor, $promise)) {
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$struct->results[$key] = $promise;
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}
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if ($struct->remaining === 0) {
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$struct->promisor->succeed($struct->results);
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break;
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}
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} catch (\Throwable $e) {
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// @TODO Remove coverage ignore block once PHP5 support is no longer required
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// @codeCoverageIgnoreStart
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$struct->remaining = 0;
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$struct->promisor->fail($e);
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break;
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// @codeCoverageIgnoreEnd
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} catch (\Exception $e) {
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// @TODO Remove this catch block once PHP5 support is no longer required
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$struct->remaining = 0;
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$struct->promisor->fail($e);
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break;
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}
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}
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}
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return $struct->promisor->promise();
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}
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/**
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* Pipe the promised value through the specified functor once it resolves
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*
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* @param mixed $promise Any value is acceptable -- non-promises are normalized to promise form
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* @param callable $functor The functor through which to pipe the resolved promise value
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* @return \Amp\Promise
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*/
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function pipe($promise, callable $functor) {
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if (!$promise instanceof Promise) {
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try {
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return new Success(\call_user_func($functor, $promise));
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} catch (\Throwable $e) {
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// @TODO Remove coverage ignore block once PHP5 support is no longer required
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// @codeCoverageIgnoreStart
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return new Failure($e);
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// @codeCoverageIgnoreEnd
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} catch (\Exception $e) {
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// @TODO Remove this catch block once PHP5 support is no longer required
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return new Failure($e);
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}
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}
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$promisor = new Deferred;
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$promise->when(function($error, $result) use ($promisor, $functor) {
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if ($error) {
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$promisor->fail($error);
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return;
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}
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try {
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$promisor->succeed(\call_user_func($functor, $result));
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} catch (\Throwable $error) {
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// @TODO Remove coverage ignore block once PHP5 support is no longer required
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// @codeCoverageIgnoreStart
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$promisor->fail($error);
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// @codeCoverageIgnoreEnd
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} catch (\Exception $error) {
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// @TODO Remove this catch block once PHP5 support is no longer required
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$promisor->fail($error);
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}
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});
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return $promisor->promise();
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}
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/**
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* Normalize an array of mixed values/Promises/Promisors to array<Promise>
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*
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* @param array $values
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* @return array Returns an array of Promise instances
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*/
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function promises(array $values) {
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foreach ($values as $key => $value) {
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if ($value instanceof Promise) {
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continue;
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} elseif ($value instanceof Promisor) {
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$values[$key] = $value->promise();
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} else {
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$values[$key] = new Success($value);
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}
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}
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return $values;
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}
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|
|
/**
|
|
* Create an artificial timeout for any Promise instance
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*
|
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* If the timeout expires prior to promise resolution the returned
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* promise is failed.
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*
|
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* @param \Amp\Promise $promise The promise to which the timeout applies
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* @param int $msTimeout The timeout in milliseconds
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* @param \Amp\Reactor $reactor Optional reactor instance -- defaults to the global reactor
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* @return \Amp\Promise
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*/
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function timeout(Promise $promise, $msTimeout, Reactor $reactor = null) {
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$reactor = $reactor ?: reactor();
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$resolved = false;
|
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$promisor = new Deferred;
|
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$watcherId = $reactor->once(function() use ($promisor, &$resolved) {
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$resolved = true;
|
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$promisor->fail(new \RuntimeException(
|
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"Promise resolution timed out"
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));
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}, $msTimeout);
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$promise->when(function($error = null, $result = null) use ($reactor, $promisor, $watcherId, &$resolved) {
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if ($resolved) {
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return;
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}
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$resolved = true;
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$reactor->cancel($watcherId);
|
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if ($error) {
|
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$promisor->fail($error);
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} else {
|
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$promisor->succeed($result);
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}
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});
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|
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return $promisor->promise();
|
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}
|
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|
|
/**
|
|
* Block script execution indefinitely until the specified Promise resolves
|
|
*
|
|
* In the event of promise failure this method will throw the exception responsible for the failure.
|
|
* Otherwise the promise's resolved value is returned.
|
|
*
|
|
* If the optional event reactor instance is not specified then the global default event reactor
|
|
* is used. Applications should be very careful to avoid instantiating multiple event reactors as
|
|
* this can lead to hard-to-debug failures. If the async value producer uses a different event
|
|
* reactor instance from that specified in this method the wait() call will never return.
|
|
*
|
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* @param \Amp\Promise $promise The promise on which to wait
|
|
* @param \Amp\Reactor $reactor
|
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* @throws \Exception if the promise fails
|
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* @return mixed Returns the eventual resolution result for the specified promise
|
|
*/
|
|
function wait(Promise $promise, Reactor $reactor = null) {
|
|
$isWaiting = true;
|
|
$resolvedError = null;
|
|
$resolvedResult = null;
|
|
|
|
$promise->when(function($error, $result) use (&$isWaiting, &$resolvedError, &$resolvedResult) {
|
|
$isWaiting = false;
|
|
$resolvedError = $error;
|
|
$resolvedResult = $result;
|
|
});
|
|
|
|
$reactor = $reactor ?: reactor();
|
|
while ($isWaiting) {
|
|
$reactor->tick();
|
|
}
|
|
|
|
if ($resolvedError) {
|
|
throw $resolvedError;
|
|
}
|
|
|
|
return $resolvedResult;
|
|
}
|
|
|
|
/**
|
|
* Return a new function that will be resolved as a coroutine when invoked
|
|
*
|
|
* @param callable $func The callable to be wrapped for coroutine resolution
|
|
* @param \Amp\Reactor $reactor
|
|
* @return callable Returns a wrapped callable
|
|
* @TODO Use variadic function instead of func_get_args() once PHP5.5 is no longer supported
|
|
*/
|
|
function coroutine(callable $func, Reactor $reactor = null) {
|
|
return function() use ($func, $reactor) {
|
|
$out = \call_user_func_array($func, \func_get_args());
|
|
return ($out instanceof \Generator)
|
|
? resolve($out, $reactor)
|
|
: $out;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Resolve a Generator coroutine function
|
|
*
|
|
* Upon resolution the Generator return value is used to succeed the promised result. If an
|
|
* error occurs during coroutine resolution the returned promise fails.
|
|
*
|
|
* @param \Generator $generator The generator to resolve as a coroutine
|
|
* @param \Amp\Reactor $reactor
|
|
*/
|
|
function resolve(\Generator $generator, Reactor $reactor = null) {
|
|
$cs = new CoroutineState;
|
|
$cs->reactor = $reactor ?: reactor();
|
|
$cs->promisor = new Deferred;
|
|
$cs->generator = $generator;
|
|
$cs->returnValue = null;
|
|
$cs->currentPromise = null;
|
|
$cs->nestingLevel = 0;
|
|
|
|
__coroutineAdvance($cs);
|
|
|
|
return $cs->promisor->promise();
|
|
}
|
|
|
|
/**
|
|
* This function is used internally when resolving coroutines.
|
|
* It is not considered part of the public API and library users
|
|
* should not rely upon it in applications.
|
|
*/
|
|
function __coroutineAdvance(CoroutineState $cs) {
|
|
try {
|
|
$yielded = $cs->generator->current();
|
|
if (!isset($yielded)) {
|
|
if ($cs->generator->valid()) {
|
|
$cs->reactor->immediately("Amp\__coroutineNextTick", ["cb_data" => $cs]);
|
|
} elseif (isset($cs->returnValue)) {
|
|
$cs->promisor->succeed($cs->returnValue);
|
|
} else {
|
|
$result = (PHP_MAJOR_VERSION >= 7) ? $cs->generator->getReturn() : null;
|
|
$cs->promisor->succeed($result);
|
|
}
|
|
} elseif ($yielded instanceof Promise) {
|
|
if ($cs->nestingLevel < 3) {
|
|
$cs->nestingLevel++;
|
|
$yielded->when("Amp\__coroutineSend", $cs);
|
|
$cs->nestingLevel--;
|
|
} else {
|
|
$cs->currentPromise = $yielded;
|
|
$cs->reactor->immediately("Amp\__coroutineNextTick", ["cb_data" => $cs]);
|
|
}
|
|
} elseif ($yielded instanceof CoroutineResult) {
|
|
/**
|
|
* @TODO This block is necessary for PHP5; remove once PHP7 is required and
|
|
* we have return expressions in generators
|
|
*/
|
|
$cs->returnValue = $yielded->getReturn();
|
|
__coroutineSend(null, null, $cs);
|
|
} else {
|
|
/**
|
|
* @TODO Remove CoroutineResult from error message once PHP7 is required
|
|
*/
|
|
$error = new \DomainException(makeGeneratorError($cs->generator, \sprintf(
|
|
"Unexpected yield (Promise|CoroutineResult|null expected); %s yielded at key %s",
|
|
\is_object($yielded) ? \get_class($yielded) : \gettype($yielded),
|
|
$cs->generator->key()
|
|
)));
|
|
$cs->reactor->immediately(function() use ($cs, $error) {
|
|
$cs->promisor->fail($error);
|
|
});
|
|
}
|
|
} catch (\Throwable $uncaught) {
|
|
/**
|
|
* @codeCoverageIgnoreStart
|
|
* @TODO Remove these coverage ignore lines once PHP7 is required
|
|
*/
|
|
$cs->reactor->immediately(function() use ($cs, $uncaught) {
|
|
$cs->promisor->fail($uncaught);
|
|
});
|
|
/**
|
|
* @codeCoverageIgnoreEnd
|
|
*/
|
|
} catch (\Exception $uncaught) {
|
|
/**
|
|
* @TODO This extra catch block is necessary for PHP5; remove once PHP7 is required
|
|
*/
|
|
$cs->reactor->immediately(function() use ($cs, $uncaught) {
|
|
$cs->promisor->fail($uncaught);
|
|
});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This function is used internally when resolving coroutines.
|
|
* It is not considered part of the public API and library users
|
|
* should not rely upon it in applications.
|
|
*/
|
|
function __coroutineNextTick(Reactor $reactor, $watcherId, CoroutineState $cs) {
|
|
if ($cs->currentPromise) {
|
|
$promise = $cs->currentPromise;
|
|
$cs->currentPromise = null;
|
|
$promise->when("Amp\__coroutineSend", $cs);
|
|
} else {
|
|
__coroutineSend(null, null, $cs);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* This function is used internally when resolving coroutines.
|
|
* It is not considered part of the public API and library users
|
|
* should not rely upon it in applications.
|
|
*/
|
|
function __coroutineSend($error, $result, CoroutineState $cs) {
|
|
try {
|
|
if ($error) {
|
|
$cs->generator->throw($error);
|
|
} else {
|
|
$cs->generator->send($result);
|
|
}
|
|
__coroutineAdvance($cs);
|
|
} catch (\Exception $uncaught) {
|
|
$cs->reactor->immediately(function() use ($cs, $uncaught) {
|
|
$cs->promisor->fail($uncaught);
|
|
});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* A general purpose function for creating error messages from generator yields
|
|
*
|
|
* @param \Generator $generator
|
|
* @param string $prefix
|
|
* @return string
|
|
*/
|
|
function makeGeneratorError(\Generator $generator, $prefix = "Generator error") {
|
|
if (PHP_MAJOR_VERSION < 7 || !$generator->valid()) {
|
|
return $prefix;
|
|
}
|
|
|
|
$reflGen = new \ReflectionGenerator($generator);
|
|
$exeGen = $reflGen->getExecutingGenerator();
|
|
if ($isSubgenerator = ($exeGen !== $generator)) {
|
|
$reflGen = new \ReflectionGenerator($exeGen);
|
|
}
|
|
|
|
return sprintf(
|
|
"{$prefix} on line %s in %s",
|
|
$reflGen->getExecutingLine(),
|
|
$reflGen->getExecutingFile()
|
|
);
|
|
}
|