|
1
|
|
|
<?php |
|
2
|
|
|
|
|
3
|
|
|
declare(strict_types=1); |
|
4
|
|
|
|
|
5
|
|
|
namespace GraphQL\Executor\Promise\Adapter; |
|
6
|
|
|
|
|
7
|
|
|
use Exception; |
|
8
|
|
|
use GraphQL\Executor\ExecutionResult; |
|
9
|
|
|
use GraphQL\Utils\Utils; |
|
10
|
|
|
use SplQueue; |
|
11
|
|
|
use Throwable; |
|
12
|
|
|
use function is_object; |
|
13
|
|
|
use function method_exists; |
|
14
|
|
|
|
|
15
|
|
|
/** |
|
16
|
|
|
* Simplistic (yet full-featured) implementation of Promises A+ spec for regular PHP `sync` mode |
|
17
|
|
|
* (using queue to defer promises execution) |
|
18
|
|
|
*/ |
|
19
|
|
|
class SyncPromise |
|
20
|
|
|
{ |
|
21
|
|
|
const PENDING = 'pending'; |
|
22
|
|
|
const FULFILLED = 'fulfilled'; |
|
23
|
|
|
const REJECTED = 'rejected'; |
|
24
|
|
|
|
|
25
|
|
|
/** @var SplQueue */ |
|
26
|
|
|
public static $queue; |
|
27
|
|
|
|
|
28
|
|
|
/** @var string */ |
|
29
|
|
|
public $state = self::PENDING; |
|
30
|
|
|
|
|
31
|
|
|
/** @var ExecutionResult|Throwable */ |
|
32
|
|
|
public $result; |
|
33
|
|
|
|
|
34
|
|
|
/** |
|
35
|
|
|
* Promises created in `then` method of this promise and awaiting for resolution of this promise |
|
36
|
|
|
* |
|
37
|
|
|
* @var mixed[][] |
|
38
|
|
|
*/ |
|
39
|
|
|
private $waiting = []; |
|
40
|
|
|
|
|
41
|
81 |
|
public static function runQueue() : void |
|
42
|
|
|
{ |
|
43
|
81 |
|
$q = self::$queue; |
|
44
|
81 |
|
while ($q !== null && ! $q->isEmpty()) { |
|
45
|
81 |
|
$task = $q->dequeue(); |
|
46
|
81 |
|
$task(); |
|
47
|
|
|
} |
|
48
|
81 |
|
} |
|
49
|
|
|
|
|
50
|
275 |
|
public function resolve($value) : self |
|
51
|
|
|
{ |
|
52
|
275 |
|
switch ($this->state) { |
|
53
|
275 |
|
case self::PENDING: |
|
54
|
270 |
|
if ($value === $this) { |
|
55
|
1 |
|
throw new Exception('Cannot resolve promise with self'); |
|
56
|
|
|
} |
|
57
|
270 |
|
if (is_object($value) && method_exists($value, 'then')) { |
|
58
|
24 |
|
$value->then( |
|
59
|
|
|
function ($resolvedValue) { |
|
60
|
13 |
|
$this->resolve($resolvedValue); |
|
61
|
24 |
|
}, |
|
62
|
|
|
function ($reason) { |
|
63
|
13 |
|
$this->reject($reason); |
|
64
|
24 |
|
} |
|
65
|
|
|
); |
|
66
|
|
|
|
|
67
|
24 |
|
return $this; |
|
68
|
|
|
} |
|
69
|
|
|
|
|
70
|
270 |
|
$this->state = self::FULFILLED; |
|
71
|
270 |
|
$this->result = $value; |
|
72
|
270 |
|
$this->enqueueWaitingPromises(); |
|
73
|
270 |
|
break; |
|
74
|
15 |
|
case self::FULFILLED: |
|
75
|
5 |
|
if ($this->result !== $value) { |
|
76
|
5 |
|
throw new Exception('Cannot change value of fulfilled promise'); |
|
77
|
|
|
} |
|
78
|
|
|
break; |
|
79
|
10 |
|
case self::REJECTED: |
|
80
|
10 |
|
throw new Exception('Cannot resolve rejected promise'); |
|
81
|
|
|
} |
|
82
|
|
|
|
|
83
|
270 |
|
return $this; |
|
84
|
|
|
} |
|
85
|
|
|
|
|
86
|
49 |
|
public function reject($reason) : self |
|
87
|
|
|
{ |
|
88
|
49 |
|
if (! $reason instanceof Throwable) { |
|
89
|
1 |
|
throw new Exception('SyncPromise::reject() has to be called with an instance of \Throwable'); |
|
90
|
|
|
} |
|
91
|
|
|
|
|
92
|
49 |
|
switch ($this->state) { |
|
93
|
49 |
|
case self::PENDING: |
|
94
|
44 |
|
$this->state = self::REJECTED; |
|
95
|
44 |
|
$this->result = $reason; |
|
96
|
44 |
|
$this->enqueueWaitingPromises(); |
|
97
|
44 |
|
break; |
|
98
|
15 |
|
case self::REJECTED: |
|
99
|
10 |
|
if ($reason !== $this->result) { |
|
100
|
10 |
|
throw new Exception('Cannot change rejection reason'); |
|
101
|
|
|
} |
|
102
|
|
|
break; |
|
103
|
5 |
|
case self::FULFILLED: |
|
104
|
5 |
|
throw new Exception('Cannot reject fulfilled promise'); |
|
105
|
|
|
} |
|
106
|
|
|
|
|
107
|
44 |
|
return $this; |
|
108
|
|
|
} |
|
109
|
|
|
|
|
110
|
280 |
|
private function enqueueWaitingPromises() : void |
|
111
|
|
|
{ |
|
112
|
280 |
|
Utils::invariant( |
|
113
|
280 |
|
$this->state !== self::PENDING, |
|
114
|
280 |
|
'Cannot enqueue derived promises when parent is still pending' |
|
115
|
|
|
); |
|
116
|
|
|
|
|
117
|
280 |
|
foreach ($this->waiting as $descriptor) { |
|
118
|
|
|
self::getQueue()->enqueue(function () use ($descriptor) { |
|
119
|
|
|
/** @var self $promise */ |
|
120
|
81 |
|
[$promise, $onFulfilled, $onRejected] = $descriptor; |
|
121
|
|
|
|
|
122
|
81 |
|
if ($this->state === self::FULFILLED) { |
|
123
|
|
|
try { |
|
124
|
77 |
|
$promise->resolve($onFulfilled === null ? $this->result : $onFulfilled($this->result)); |
|
125
|
14 |
|
} catch (Throwable $e) { |
|
126
|
77 |
|
$promise->reject($e); |
|
127
|
|
|
} |
|
128
|
34 |
|
} elseif ($this->state === self::REJECTED) { |
|
129
|
|
|
try { |
|
130
|
34 |
|
if ($onRejected === null) { |
|
131
|
23 |
|
$promise->reject($this->result); |
|
132
|
|
|
} else { |
|
133
|
34 |
|
$promise->resolve($onRejected($this->result)); |
|
134
|
|
|
} |
|
135
|
14 |
|
} catch (Throwable $e) { |
|
136
|
14 |
|
$promise->reject($e); |
|
137
|
|
|
} |
|
138
|
|
|
} |
|
139
|
81 |
|
}); |
|
140
|
|
|
} |
|
141
|
280 |
|
$this->waiting = []; |
|
142
|
280 |
|
} |
|
143
|
|
|
|
|
144
|
254 |
|
public static function getQueue() : SplQueue |
|
145
|
|
|
{ |
|
146
|
254 |
|
return self::$queue ?: self::$queue = new SplQueue(); |
|
147
|
|
|
} |
|
148
|
|
|
|
|
149
|
82 |
|
public function then(?callable $onFulfilled = null, ?callable $onRejected = null) |
|
150
|
|
|
{ |
|
151
|
82 |
|
if ($this->state === self::REJECTED && $onRejected === null) { |
|
152
|
5 |
|
return $this; |
|
153
|
|
|
} |
|
154
|
82 |
|
if ($this->state === self::FULFILLED && $onFulfilled === null) { |
|
155
|
5 |
|
return $this; |
|
156
|
|
|
} |
|
157
|
82 |
|
$tmp = new self(); |
|
158
|
82 |
|
$this->waiting[] = [$tmp, $onFulfilled, $onRejected]; |
|
159
|
|
|
|
|
160
|
82 |
|
if ($this->state !== self::PENDING) { |
|
161
|
57 |
|
$this->enqueueWaitingPromises(); |
|
162
|
|
|
} |
|
163
|
|
|
|
|
164
|
82 |
|
return $tmp; |
|
165
|
|
|
} |
|
166
|
|
|
} |
|
167
|
|
|
|
webonyx /
graphql-php
