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<?php
declare(strict_types=1);
/**
* SPDX-FileCopyrightText: 2023 Nextcloud GmbH and Nextcloud contributors
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
namespace OCP\Http\Client;
use Exception;
use LogicException;
/**
* A wrapper around Guzzle's PromiseInterface
* @see \GuzzleHttp\Promise\PromiseInterface
* @since 28.0.0
*/
interface IPromise {
/**
* @since 28.0.0
*/
public const STATE_PENDING = 'pending';
/**
* @since 28.0.0
*/
public const STATE_FULFILLED = 'fulfilled';
/**
* @since 28.0.0
*/
public const STATE_REJECTED = 'rejected';
/**
* Appends fulfillment and rejection handlers to the promise, and returns
* a new promise resolving to the return value of the called handler.
*
* @param ?callable(IResponse): void $onFulfilled Invoked when the promise fulfills. Gets an \OCP\Http\Client\IResponse passed in as argument
* @param ?callable(Exception): void $onRejected Invoked when the promise is rejected. Gets an \Exception passed in as argument
*
* @return IPromise
* @since 28.0.0
*/
public function then(
?callable $onFulfilled = null,
?callable $onRejected = null,
): IPromise;
/**
* Get the state of the promise ("pending", "rejected", or "fulfilled").
*
* The three states can be checked against the constants defined:
* STATE_PENDING, STATE_FULFILLED, and STATE_REJECTED.
*
* @return self::STATE_*
* @since 28.0.0
*/
public function getState(): string;
/**
* Cancels the promise if possible.
*
* @link https://github.com/promises-aplus/cancellation-spec/issues/7
* @since 28.0.0
*/
public function cancel(): void;
/**
* Waits until the promise completes if possible.
*
* Pass $unwrap as true to unwrap the result of the promise, either
* returning the resolved value or throwing the rejected exception.
*
* If the promise cannot be waited on, then the promise will be rejected.
*
* @param bool $unwrap
*
* @return mixed
*
* @throws LogicException if the promise has no wait function or if the
* promise does not settle after waiting.
* @since 28.0.0
*/
public function wait(bool $unwrap = true): mixed;
}
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