version 1.5

libs/vendor/php-http/client-common/src/Deferred.php

@@ -0,0 +1,155 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Http\Client\Common;
+
+use Http\Promise\Promise;
+use Psr\Http\Client\ClientExceptionInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * A deferred allow to return a promise which has not been resolved yet.
+ */
+final class Deferred implements Promise
+{
+    /**
+     * @var ResponseInterface|null
+     */
+    private $value;
+
+    /**
+     * @var ClientExceptionInterface|null
+     */
+    private $failure;
+
+    /**
+     * @var string
+     */
+    private $state;
+
+    /**
+     * @var callable
+     */
+    private $waitCallback;
+
+    /**
+     * @var callable[]
+     */
+    private $onFulfilledCallbacks;
+
+    /**
+     * @var callable[]
+     */
+    private $onRejectedCallbacks;
+
+    public function __construct(callable $waitCallback)
+    {
+        $this->waitCallback = $waitCallback;
+        $this->state = Promise::PENDING;
+        $this->onFulfilledCallbacks = [];
+        $this->onRejectedCallbacks = [];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function then(callable $onFulfilled = null, callable $onRejected = null): Promise
+    {
+        $deferred = new self($this->waitCallback);
+
+        $this->onFulfilledCallbacks[] = function (ResponseInterface $response) use ($onFulfilled, $deferred) {
+            try {
+                if (null !== $onFulfilled) {
+                    $response = $onFulfilled($response);
+                }
+                $deferred->resolve($response);
+            } catch (ClientExceptionInterface $exception) {
+                $deferred->reject($exception);
+            }
+        };
+
+        $this->onRejectedCallbacks[] = function (ClientExceptionInterface $exception) use ($onRejected, $deferred) {
+            try {
+                if (null !== $onRejected) {
+                    $response = $onRejected($exception);
+                    $deferred->resolve($response);
+
+                    return;
+                }
+                $deferred->reject($exception);
+            } catch (ClientExceptionInterface $newException) {
+                $deferred->reject($newException);
+            }
+        };
+
+        return $deferred;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getState(): string
+    {
+        return $this->state;
+    }
+
+    /**
+     * Resolve this deferred with a Response.
+     */
+    public function resolve(ResponseInterface $response): void
+    {
+        if (Promise::PENDING !== $this->state) {
+            return;
+        }
+
+        $this->value = $response;
+        $this->state = Promise::FULFILLED;
+
+        foreach ($this->onFulfilledCallbacks as $onFulfilledCallback) {
+            $onFulfilledCallback($response);
+        }
+    }
+
+    /**
+     * Reject this deferred with an Exception.
+     */
+    public function reject(ClientExceptionInterface $exception): void
+    {
+        if (Promise::PENDING !== $this->state) {
+            return;
+        }
+
+        $this->failure = $exception;
+        $this->state = Promise::REJECTED;
+
+        foreach ($this->onRejectedCallbacks as $onRejectedCallback) {
+            $onRejectedCallback($exception);
+        }
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function wait($unwrap = true)
+    {
+        if (Promise::PENDING === $this->state) {
+            $callback = $this->waitCallback;
+            $callback();
+        }
+
+        if (!$unwrap) {
+            return null;
+        }
+
+        if (Promise::FULFILLED === $this->state) {
+            return $this->value;
+        }
+
+        if (null === $this->failure) {
+            throw new \RuntimeException('Internal Error: Promise is not fulfilled but has no exception stored');
+        }
+
+        throw $this->failure;
+    }
+}