| 1: | <?php |
| 2: | |
| 3: | declare(strict_types=1); |
| 4: | |
| 5: | |
| 6: | |
| 7: | |
| 8: | |
| 9: | |
| 10: | |
| 11: | |
| 12: | |
| 13: | |
| 14: | namespace Nexus\Mcp\Server\Resource; |
| 15: | |
| 16: | use Nexus\Assert\Assert; |
| 17: | use Nexus\Mcp\Core\Exception\InvalidParamsException; |
| 18: | use Nexus\Mcp\Core\SafeDisplay; |
| 19: | use Nexus\Mcp\Core\Schema\Cursor; |
| 20: | use Nexus\Mcp\Core\Schema\Enum\CacheScope; |
| 21: | use Nexus\Mcp\Core\Schema\Resource\Resource; |
| 22: | use Nexus\Mcp\Core\Schema\Result\InputRequiredResult; |
| 23: | use Nexus\Mcp\Core\Schema\Result\ListResourcesResult; |
| 24: | use Nexus\Mcp\Core\Schema\Result\ReadResourceResult; |
| 25: | use Nexus\Mcp\Core\Validation\IconSrcValidator; |
| 26: | use Nexus\Mcp\Core\Validation\IdentifierNameValidator; |
| 27: | use Nexus\Mcp\Server\CursorPaginator; |
| 28: | use Nexus\Mcp\Server\Exception\ResourceNotRegisteredException; |
| 29: | use Nexus\Mcp\Server\ServerContext; |
| 30: | |
| 31: | |
| 32: | |
| 33: | |
| 34: | final class ResourceStore implements MutableResourceStoreInterface |
| 35: | { |
| 36: | private readonly CursorPaginator $paginator; |
| 37: | |
| 38: | |
| 39: | |
| 40: | |
| 41: | private array $listChangedListeners = []; |
| 42: | |
| 43: | |
| 44: | |
| 45: | |
| 46: | public function __construct( |
| 47: | private array $entries = [], |
| 48: | int $pageSize = CursorPaginator::DEFAULT_PAGE_SIZE, |
| 49: | private readonly int $ttlMs = 0, |
| 50: | private readonly CacheScope $cacheScope = CacheScope::Private, |
| 51: | ) { |
| 52: | Assert::that($entries) |
| 53: | ->keys() |
| 54: | ->isNonEmptyString('Resource store entry key must be a non-empty string.') |
| 55: | ; |
| 56: | |
| 57: | foreach ($entries as $key => $entry) { |
| 58: | IdentifierNameValidator::validate($entry->resource->name, 'resource "name"'); |
| 59: | IconSrcValidator::validate($entry->resource->icons, 'resource'); |
| 60: | |
| 61: | Assert::that($entry->resource->uri) |
| 62: | ->isIdentical($key, 'Resource store entry key "{other}" must match its resource URI "{value}".') |
| 63: | ; |
| 64: | } |
| 65: | |
| 66: | Assert::that($pageSize)->isPositiveInt('Resource store page size must be a positive integer, {value} given.'); |
| 67: | Assert::that($ttlMs)->isNaturalInt('Resource store TTL must be a non-negative integer, {value} given.'); |
| 68: | |
| 69: | $this->paginator = new CursorPaginator($pageSize); |
| 70: | } |
| 71: | |
| 72: | #[\Override] |
| 73: | public function onListChanged(\Closure $listener): void |
| 74: | { |
| 75: | $this->listChangedListeners[] = $listener; |
| 76: | } |
| 77: | |
| 78: | #[\Override] |
| 79: | public function addResource(Resource $resource, ResourceReaderInterface $reader): void |
| 80: | { |
| 81: | IdentifierNameValidator::validate($resource->name, 'resource "name"'); |
| 82: | IconSrcValidator::validate($resource->icons, 'resource'); |
| 83: | |
| 84: | $this->entries[$resource->uri] = new ResourceEntry($resource, $reader); |
| 85: | |
| 86: | $this->announceListChange(); |
| 87: | } |
| 88: | |
| 89: | #[\Override] |
| 90: | public function removeResource(string $uri): bool |
| 91: | { |
| 92: | if (! \array_key_exists($uri, $this->entries)) { |
| 93: | return false; |
| 94: | } |
| 95: | |
| 96: | unset($this->entries[$uri]); |
| 97: | |
| 98: | $this->announceListChange(); |
| 99: | |
| 100: | return true; |
| 101: | } |
| 102: | |
| 103: | #[\Override] |
| 104: | public function list(?Cursor $cursor): ListResourcesResult |
| 105: | { |
| 106: | $page = $this->paginator->paginate($this->entries, $cursor); |
| 107: | |
| 108: | return new ListResourcesResult( |
| 109: | resources: array_map(static fn(ResourceEntry $entry): Resource => $entry->resource, $page->entries), |
| 110: | ttlMs: $this->ttlMs, |
| 111: | cacheScope: $this->cacheScope, |
| 112: | nextCursor: $page->nextCursor, |
| 113: | ); |
| 114: | } |
| 115: | |
| 116: | #[\Override] |
| 117: | public function read(string $uri, ServerContext $context): InputRequiredResult|ReadResourceResult |
| 118: | { |
| 119: | $entry = $this->entries[$uri] ?? throw new ResourceNotRegisteredException($uri, $context->requestId); |
| 120: | |
| 121: | try { |
| 122: | return $entry->reader->read($uri, $context); |
| 123: | } catch (InvalidParamsException $e) { |
| 124: | throw new InvalidParamsException( |
| 125: | $context->requestId, |
| 126: | SafeDisplay::sanitiseCause(\sprintf('Invalid arguments for resource "%s": %s', $uri, $e->getMessage())), |
| 127: | ); |
| 128: | } |
| 129: | } |
| 130: | |
| 131: | private function announceListChange(): void |
| 132: | { |
| 133: | foreach ($this->listChangedListeners as $listener) { |
| 134: | $listener(); |
| 135: | } |
| 136: | } |
| 137: | } |
| 138: | |