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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Celema\Container; |
| 6 | |
| 7 | use Celema\Container\Exception\ContainerException; |
| 8 | use Celema\Container\Exception\NotFoundException; |
| 9 | use Celema\Container\Exception\ResetFailed; |
| 10 | use Celema\Wire\CallableResolver; |
| 11 | use Celema\Wire\Creator; |
| 12 | use Celema\Wire\Exception\WireException; |
| 13 | use Closure; |
| 14 | use Override; |
| 15 | use Psr\Container\ContainerExceptionInterface; |
| 16 | use Psr\Container\ContainerInterface as PsrContainer; |
| 17 | use Throwable; |
| 18 | |
| 19 | /** @psalm-api */ |
| 20 | class Container implements PsrContainer |
| 21 | { |
| 22 | protected Creator $creator; |
| 23 | protected readonly ?PsrContainer $wrappedContainer; |
| 24 | protected bool $sealed = false; |
| 25 | |
| 26 | /** @var array<string, Entry> */ |
| 27 | protected array $entries = []; |
| 28 | |
| 29 | /** @var array<string, mixed> */ |
| 30 | protected array $instances = []; |
| 31 | |
| 32 | /** @var array<non-empty-string, self> */ |
| 33 | protected array $tags = []; |
| 34 | |
| 35 | /** @var array<int, Resettable> */ |
| 36 | protected array $usedResettables = []; |
| 37 | |
| 38 | /** The root tag whose registrations a scope's tag container lists and resolves. */ |
| 39 | protected ?Container $inherits = null; |
| 40 | |
| 41 | public function __construct( |
| 42 | public readonly bool $autowire = true, |
| 43 | ?PsrContainer $container = null, |
| 44 | protected readonly string $tag = '', |
| 45 | protected readonly ?Container $parent = null, |
| 46 | protected readonly bool $isScope = false, |
| 47 | ) { |
| 48 | if ($container) { |
| 49 | $this->wrappedContainer = $container; |
| 50 | $this->add(PsrContainer::class, $container); |
| 51 | $this->add($container::class, $container); |
| 52 | } else { |
| 53 | $this->wrappedContainer = null; |
| 54 | $this->add(PsrContainer::class, $this); |
| 55 | } |
| 56 | $this->add(Container::class, $this); |
| 57 | $this->creator = new Creator($this); |
| 58 | } |
| 59 | |
| 60 | public function scope(): Container |
| 61 | { |
| 62 | $root = $this->root(); |
| 63 | |
| 64 | if (!$root->sealed) { |
| 65 | $root->seal(); |
| 66 | } |
| 67 | |
| 68 | return new self( |
| 69 | autowire: $root->autowire, |
| 70 | parent: $root, |
| 71 | isScope: true, |
| 72 | ); |
| 73 | } |
| 74 | |
| 75 | public function reset(): void |
| 76 | { |
| 77 | if (!$this->isScope) { |
| 78 | return; |
| 79 | } |
| 80 | |
| 81 | $resetIds = []; |
| 82 | $failures = []; |
| 83 | $this->resetScope($resetIds, $failures); |
| 84 | |
| 85 | if ($failures !== []) { |
| 86 | throw new ResetFailed($failures); |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | #[Override] |
| 91 | public function has(string $id): bool |
| 92 | { |
| 93 | return ( |
| 94 | isset($this->entries[$id]) |
| 95 | || isset($this->inherits?->entries[$id]) |
| 96 | || $this->parent?->has($id) |
| 97 | || $this->wrappedContainer?->has($id) |
| 98 | ); |
| 99 | } |
| 100 | |
| 101 | /** @return list<string> */ |
| 102 | public function entries(bool $includeContainer = false): array |
| 103 | { |
| 104 | $inherited = $this->inherits?->entries(true) ?? []; |
| 105 | $keys = $inherited === [] |
| 106 | ? array_keys($this->entries) |
| 107 | : array_values(array_unique([...array_keys($this->entries), ...$inherited])); |
| 108 | |
| 109 | if ($includeContainer) { |
| 110 | return $keys; |
| 111 | } |
| 112 | |
| 113 | return array_values(array_filter( |
| 114 | $keys, |
| 115 | static fn(string $item): bool => $item !== PsrContainer::class |
| 116 | && !is_subclass_of($item, PsrContainer::class), |
| 117 | )); |
| 118 | } |
| 119 | |
| 120 | public function entry(string $id): Entry |
| 121 | { |
| 122 | return ( |
| 123 | $this->entries[$id] |
| 124 | ?? $this->inherits?->entries[$id] |
| 125 | ?? throw new NotFoundException('Unresolvable entry - id: ' . $id) |
| 126 | ); |
| 127 | } |
| 128 | |
| 129 | #[Override] |
| 130 | public function get(string $id): mixed |
| 131 | { |
| 132 | try { |
| 133 | if (array_key_exists($id, $this->instances)) { |
| 134 | return $this->trackAndReturn($this->instances[$id]); |
| 135 | } |
| 136 | |
| 137 | $resolved = $this->findEntry($id); |
| 138 | |
| 139 | if ($resolved !== null) { |
| 140 | return $this->trackAndReturn( |
| 141 | $this->resolveEntry( |
| 142 | entryOwner: $resolved[0], |
| 143 | entry: $resolved[1], |
| 144 | id: $id, |
| 145 | requester: $this, |
| 146 | ), |
| 147 | ); |
| 148 | } |
| 149 | |
| 150 | if ($this->tag !== '' && $this->parent !== null) { |
| 151 | // Ids that were not tagged belong to the container that owns the |
| 152 | // tag. Resolving them there keeps their lifetime caches and the |
| 153 | // overrides of an enclosing scope. |
| 154 | return $this->parent->get($id); |
| 155 | } |
| 156 | |
| 157 | $wrappedContainer = $this->root()->wrappedContainer; |
| 158 | |
| 159 | if ($wrappedContainer?->has($id)) { |
| 160 | return $this->trackAndReturn($wrappedContainer->get($id)); |
| 161 | } |
| 162 | |
| 163 | // Autowiring: $id does not exists as an entry in the container |
| 164 | if ($this->autowire && class_exists($id)) { |
| 165 | return $this->trackAndReturn($this->creator->create($id)); |
| 166 | } |
| 167 | } catch (WireException $e) { |
| 168 | throw new NotFoundException( |
| 169 | 'Unresolvable id: ' . $id . ' - Details: ' . $e->getMessage(), |
| 170 | previous: $e, |
| 171 | ); |
| 172 | } catch (ContainerExceptionInterface $e) { |
| 173 | throw $e; |
| 174 | } catch (Throwable $e) { |
| 175 | throw new ContainerException( |
| 176 | 'Unresolvable id: ' . $id . ' - ' . $e->getMessage(), |
| 177 | previous: $e, |
| 178 | ); |
| 179 | } |
| 180 | |
| 181 | throw new NotFoundException('Unresolvable id: ' . $id); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * @template T of object |
| 186 | * @param class-string<T> $class |
| 187 | * @return T |
| 188 | */ |
| 189 | public function instance(string $class): object |
| 190 | { |
| 191 | /** @var mixed $value */ |
| 192 | $value = $this->get($class); |
| 193 | |
| 194 | if (!$value instanceof $class) { |
| 195 | throw new ContainerException( |
| 196 | "Entry '{$class}' resolves to " . get_debug_type($value) . ', not an instance of it', |
| 197 | ); |
| 198 | } |
| 199 | |
| 200 | return $value; |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * @param non-empty-string $id |
| 205 | */ |
| 206 | public function add( |
| 207 | string $id, |
| 208 | mixed $value = null, |
| 209 | ): Entry { |
| 210 | $this->assertMutable(); |
| 211 | $entry = new Entry($id, $value ?? $id); |
| 212 | $this->entries[$id] = $entry; |
| 213 | unset($this->instances[$id]); |
| 214 | |
| 215 | return $entry; |
| 216 | } |
| 217 | |
| 218 | public function addEntry( |
| 219 | Entry $entry, |
| 220 | ): Entry { |
| 221 | $this->assertMutable(); |
| 222 | $this->entries[$entry->id] = $entry; |
| 223 | unset($this->instances[$entry->id]); |
| 224 | |
| 225 | return $entry; |
| 226 | } |
| 227 | |
| 228 | /** @param non-empty-string $tag */ |
| 229 | public function tag(string $tag): Container |
| 230 | { |
| 231 | if (isset($this->tags[$tag])) { |
| 232 | return $this->tags[$tag]; |
| 233 | } |
| 234 | |
| 235 | if ($this->sealed) { |
| 236 | // Reading a tag that was never registered is not a structural change. |
| 237 | // The empty view is not stored, so the sealed container stays as it is. |
| 238 | $view = new self(autowire: $this->autowire, tag: $tag, parent: $this); |
| 239 | $view->seal(); |
| 240 | |
| 241 | return $view; |
| 242 | } |
| 243 | |
| 244 | $tagContainer = new self( |
| 245 | autowire: $this->autowire, |
| 246 | tag: $tag, |
| 247 | parent: $this, |
| 248 | isScope: $this->isScope, |
| 249 | ); |
| 250 | |
| 251 | // A scope's tag lists the root tag's registrations and adds its own, |
| 252 | // while untagged ids resolve through the scope. |
| 253 | if ($this->isScope) { |
| 254 | $tagContainer->inherits = $this->root()->tags[$tag] ?? null; |
| 255 | } |
| 256 | |
| 257 | return $this->tags[$tag] = $tagContainer; |
| 258 | } |
| 259 | |
| 260 | public function new(string $id, mixed ...$args): object |
| 261 | { |
| 262 | $entry = $this->entries[$id] ?? null; |
| 263 | |
| 264 | if ($entry) { |
| 265 | /** @var mixed $value */ |
| 266 | $value = $entry->definition(); |
| 267 | |
| 268 | if (is_string($value)) { |
| 269 | if (interface_exists($value)) { |
| 270 | return $this->new($value, ...$args); |
| 271 | } |
| 272 | |
| 273 | if (class_exists($value)) { |
| 274 | // Psalm cannot know the constructor of a class named at runtime. |
| 275 | /** @psalm-suppress MixedMethodCall */ |
| 276 | return new $value(...$args); |
| 277 | } |
| 278 | } |
| 279 | } |
| 280 | |
| 281 | if (class_exists($id)) { |
| 282 | // Psalm cannot know the constructor of a class named at runtime. |
| 283 | /** @psalm-suppress MixedMethodCall */ |
| 284 | return new $id(...$args); |
| 285 | } |
| 286 | |
| 287 | throw new NotFoundException('Cannot instantiate ' . $id); |
| 288 | } |
| 289 | |
| 290 | protected function resolveEntry( |
| 291 | Container $entryOwner, |
| 292 | Entry $entry, |
| 293 | string $id, |
| 294 | Container $requester, |
| 295 | ): mixed { |
| 296 | if ($entry->shouldReturnValue()) { |
| 297 | return $entry->definition(); |
| 298 | } |
| 299 | |
| 300 | if ($entry->getLifetime() === Lifetime::Scoped && !$requester->isScope && $requester->sealed) { |
| 301 | throw new ContainerException( |
| 302 | "Scoped entry '{$id}' cannot be resolved by the root container after scope() was called, " |
| 303 | . 'as every scope would share that instance. It is most likely a dependency of a shared ' |
| 304 | . 'entry: make that entry scoped or transient, or resolve the entry from a scope.', |
| 305 | ); |
| 306 | } |
| 307 | |
| 308 | [$cacheContainer, $resolutionContext] = $this->resolutionContainers( |
| 309 | $entry, |
| 310 | $entryOwner, |
| 311 | $requester, |
| 312 | ); |
| 313 | |
| 314 | if ($cacheContainer !== null && array_key_exists($id, $cacheContainer->instances)) { |
| 315 | return $cacheContainer->instances[$id]; |
| 316 | } |
| 317 | |
| 318 | // materialize() intentionally returns mixed because container entries may resolve to any value type. |
| 319 | /** @psalm-suppress MixedAssignment */ |
| 320 | $result = $this->materialize($entry, $resolutionContext); |
| 321 | |
| 322 | if ($cacheContainer !== null) { |
| 323 | $cacheContainer->instances[$id] = $result; |
| 324 | } |
| 325 | |
| 326 | return $result; |
| 327 | } |
| 328 | |
| 329 | /** |
| 330 | * @return array{0: null|Container, 1: Container} |
| 331 | */ |
| 332 | protected function resolutionContainers( |
| 333 | Entry $entry, |
| 334 | Container $entryOwner, |
| 335 | Container $requester, |
| 336 | ): array { |
| 337 | return match ($entry->getLifetime()) { |
| 338 | Lifetime::Shared => [$entryOwner, $entryOwner], |
| 339 | Lifetime::Scoped => [$requester, $requester], |
| 340 | Lifetime::Transient => [null, $requester], |
| 341 | }; |
| 342 | } |
| 343 | |
| 344 | protected function materialize(Entry $entry, Container $context): mixed |
| 345 | { |
| 346 | /** @var mixed $value */ |
| 347 | $value = $entry->definition(); |
| 348 | |
| 349 | if (is_string($value)) { |
| 350 | if (class_exists($value)) { |
| 351 | $constructor = $entry->getConstructor(); |
| 352 | $args = $entry->getArgs(); |
| 353 | |
| 354 | if (isset($args)) { |
| 355 | // Don't autowire if $args are given |
| 356 | if ($args instanceof Closure) { |
| 357 | $args = self::checkedArgs( |
| 358 | $entry, |
| 359 | $args(...new CallableResolver($context->creator)->resolve($args)), |
| 360 | ); |
| 361 | } |
| 362 | |
| 363 | return $this->applyCalls( |
| 364 | $entry, |
| 365 | $context->creator->create( |
| 366 | $value, |
| 367 | predefinedArgs: $args, |
| 368 | constructor: $constructor ?? '', |
| 369 | ), |
| 370 | $context, |
| 371 | ); |
| 372 | } |
| 373 | |
| 374 | return $this->applyCalls( |
| 375 | $entry, |
| 376 | $context->creator->create($value, constructor: $constructor ?? ''), |
| 377 | $context, |
| 378 | ); |
| 379 | } |
| 380 | |
| 381 | if ($context->has($value)) { |
| 382 | return $context->get($value); |
| 383 | } |
| 384 | |
| 385 | throw new NotFoundException('Unresolvable id: ' . $value); |
| 386 | } |
| 387 | |
| 388 | if ($value instanceof Closure) { |
| 389 | $args = $entry->getArgs(); |
| 390 | |
| 391 | if (is_null($args)) { |
| 392 | $args = new CallableResolver($context->creator)->resolve($value); |
| 393 | } elseif ($args instanceof Closure) { |
| 394 | $args = self::checkedArgs($entry, $args()); |
| 395 | } |
| 396 | |
| 397 | return $this->applyCalls($entry, $value(...$args), $context); |
| 398 | } |
| 399 | |
| 400 | if (is_object($value)) { |
| 401 | return $value; |
| 402 | } |
| 403 | |
| 404 | throw new NotFoundException( |
| 405 | "Unresolvable id: {$entry->id} - cannot resolve a definition of type " . get_debug_type($value), |
| 406 | ); |
| 407 | } |
| 408 | |
| 409 | /** @return array<array-key, mixed> */ |
| 410 | private static function checkedArgs(Entry $entry, mixed $args): array |
| 411 | { |
| 412 | if (!is_array($args)) { |
| 413 | throw new ContainerException( |
| 414 | "The args closure of entry '{$entry->id}' must return an array, " . get_debug_type($args) . ' returned', |
| 415 | ); |
| 416 | } |
| 417 | |
| 418 | return $args; |
| 419 | } |
| 420 | |
| 421 | protected function applyCalls(Entry $entry, mixed $value, Container $context): mixed |
| 422 | { |
| 423 | foreach ($entry->getCalls() as $call) { |
| 424 | $callable = [$value, $call->method]; |
| 425 | |
| 426 | if (!is_callable($callable)) { |
| 427 | throw new ContainerException( |
| 428 | "Entry '{$entry->id}' cannot call {$call->method}() on " . get_debug_type($value), |
| 429 | ); |
| 430 | } |
| 431 | |
| 432 | $args = new CallableResolver($context->creator)->resolve($callable, $call->args); |
| 433 | $callable(...$args); |
| 434 | } |
| 435 | |
| 436 | return $value; |
| 437 | } |
| 438 | |
| 439 | /** |
| 440 | * Attempts every reset hook and clears the scope even if hooks fail; the |
| 441 | * failures are collected for the caller. |
| 442 | * |
| 443 | * @param array<int, true> $resetIds |
| 444 | * @param list<Throwable> $failures |
| 445 | */ |
| 446 | protected function resetScope(array &$resetIds, array &$failures): void |
| 447 | { |
| 448 | // $instances stores mixed values by design, so foreach assigns mixed to $instance. |
| 449 | /** @psalm-suppress MixedAssignment */ |
| 450 | foreach ($this->instances as $instance) { |
| 451 | $this->resetIfNeeded($instance, $resetIds, $failures); |
| 452 | } |
| 453 | |
| 454 | foreach ($this->usedResettables as $usedResettable) { |
| 455 | $this->resetIfNeeded($usedResettable, $resetIds, $failures); |
| 456 | } |
| 457 | |
| 458 | // A scope's tags inherit isScope from it, so all of them are scopes. |
| 459 | foreach ($this->tags as $tagContainer) { |
| 460 | $tagContainer->resetScope($resetIds, $failures); |
| 461 | } |
| 462 | |
| 463 | $this->instances = []; |
| 464 | $this->entries = []; |
| 465 | $this->tags = []; |
| 466 | $this->usedResettables = []; |
| 467 | $this->add(PsrContainer::class, $this); |
| 468 | $this->add(Container::class, $this); |
| 469 | } |
| 470 | |
| 471 | /** |
| 472 | * @param array<int, true> $resetIds |
| 473 | * @param list<Throwable> $failures |
| 474 | */ |
| 475 | protected function resetIfNeeded(mixed $value, array &$resetIds, array &$failures): void |
| 476 | { |
| 477 | if (!$value instanceof Resettable) { |
| 478 | return; |
| 479 | } |
| 480 | |
| 481 | $objectId = spl_object_id($value); |
| 482 | |
| 483 | if (isset($resetIds[$objectId])) { |
| 484 | return; |
| 485 | } |
| 486 | |
| 487 | $resetIds[$objectId] = true; |
| 488 | |
| 489 | try { |
| 490 | $value->reset(); |
| 491 | } catch (Throwable $e) { |
| 492 | $failures[] = $e; |
| 493 | } |
| 494 | } |
| 495 | |
| 496 | protected function trackAndReturn(mixed $value): mixed |
| 497 | { |
| 498 | if ($this->isScope && $value instanceof Resettable) { |
| 499 | $this->usedResettables[spl_object_id($value)] = $value; |
| 500 | } |
| 501 | |
| 502 | return $value; |
| 503 | } |
| 504 | |
| 505 | /** @return array{Container, Entry}|null */ |
| 506 | protected function findEntry(string $id): ?array |
| 507 | { |
| 508 | $entry = $this->entries[$id] ?? null; |
| 509 | |
| 510 | if ($entry !== null) { |
| 511 | return [$this, $entry]; |
| 512 | } |
| 513 | |
| 514 | $inherits = $this->inherits; |
| 515 | |
| 516 | if ($inherits !== null && isset($inherits->entries[$id])) { |
| 517 | // Inherited shared entries are cached by the root tag that defines them. |
| 518 | return [$inherits, $inherits->entries[$id]]; |
| 519 | } |
| 520 | |
| 521 | // A tag container only finds tagged entries; get() hands other ids to |
| 522 | // the container owning the tag. |
| 523 | return $this->tag === '' ? $this->parent?->findEntry($id) : null; |
| 524 | } |
| 525 | |
| 526 | protected function root(): Container |
| 527 | { |
| 528 | $container = $this; |
| 529 | |
| 530 | while ($container->parent !== null) { |
| 531 | $container = $container->parent; |
| 532 | } |
| 533 | |
| 534 | return $container; |
| 535 | } |
| 536 | |
| 537 | protected function assertMutable(): void |
| 538 | { |
| 539 | if ($this->sealed) { |
| 540 | throw new ContainerException('The root container is sealed after scope() was called'); |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | protected function seal(): void |
| 545 | { |
| 546 | $this->sealed = true; |
| 547 | |
| 548 | // Scoped entries resolved before the first scope must not outlive it: |
| 549 | // the sealed container rejects them from now on. |
| 550 | foreach ($this->entries as $id => $entry) { |
| 551 | if ($entry->getLifetime() === Lifetime::Scoped) { |
| 552 | unset($this->instances[$id]); |
| 553 | } |
| 554 | } |
| 555 | |
| 556 | foreach ($this->tags as $tagContainer) { |
| 557 | $tagContainer->seal(); |
| 558 | } |
| 559 | } |
| 560 | } |