PHP code example of hsd-tech / graphql

    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

    

hsd-tech / graphql example snippets

use Digia\GraphQL\Language\FileSourceBuilder;
use function Digia\GraphQL\buildSchema;
use function Digia\GraphQL\graphql;

$sourceBuilder = new FileSourceBuilder(__DIR__ . '/star-wars.graphqls');

$schema = buildSchema($sourceBuilder->build(), [
    'Query' => [
        'hero' => function ($rootValue, $arguments) {
            return getHero($arguments['episode'] ?? null);
        },
    ],
]);

$result = graphql($schema, '
query HeroNameQuery {
  hero {
    name
  }
}');

\print_r($result);

Array
(
    [data] => Array
    (
        [hero] => Array
        (
            [name] => "R2-D2"
        )
        
    )
    
)

$schema = buildSchema($source, [
    'Query' => [
        'hero' => function ($rootValue, $arguments) {
            return getHero($arguments['episode'] ?? null);
        },
    ],
]);

$schema = buildSchema($source, [
    'Query' => [
        'hero' => new HeroResolver(),
    ],
]);

$schema = buildSchema($source, [
    'Query' => [
        'hero' => function ($rootValue, $arguments) {
            return getHero($arguments['episode'] ?? null);
        },
    ],
], [
    'middleware' => [new BeforeMiddleware()],
]);

class BeforeMiddleware implements ResolverMiddlewareInterface
{
    public function resolve(callable $resolveCallback, $rootValue, array $arguments, $context, ResolveInfo $info) {
        $newRootValue = $this->doSomethingBefore();
        return $resolveCallback($newRootValue, $arguments, $context, $info);
    }
}

$schema = buildSchema($source, [
    'Query' => [
        'hero' => function ($rootValue, $arguments) {
            return getHero($arguments['episode'] ?? null);
        },
    ],
], [
    'middleware' => [new AfterMiddleware()],
]);

class AfterMiddleware implements ResolverMiddlewareInterface
{
    public function resolve(callable $resolveCallback, $rootValue, array $arguments, $context, ResolveInfo $info) {
        $result = $resolveCallback($rootValue, $arguments, $context, $info);
        $this->doSomethingAfter();
        return $result;
    }
}

$query = '
query HeroNameQuery {
  hero {
    name
  }
}';

$result = graphql($schema, $query);

function ($rootValue, array $arguments, $context, ResolveInfo $info): string {
    return [
        'type'       => 'Human',
        'id'         => '1000',
        'name'       => 'Luke Skywalker',
        'friends'    => ['1002', '1003', '2000', '2001'],
        'appearsIn'  => ['NEWHOPE', 'EMPIRE', 'JEDI'],
        'homePlanet' => 'Tatooine',
    ];
}

class HumanResolver extends AbstractTypeResolver
{
    public function resolveName($rootValue, array $arguments, $context, ResolveInfo $info): string
    {
        return $rootValue['name'];
    }
}

class NameResolver extends AbstractFieldResolver
{
    public function resolve($rootValue, array $arguments, $context, ResolveInfo $info): string
    {
       return $rootValue['name'];
    }
}

$movieType = newObjectType([
    'fields' => [
        'title'    => ['type' => stringType()],
        'director' => [
            'type'    => $directorType,
            'resolve' => function ($movie, $args) {
                DirectorBuffer::add($movie['directorId']);
                
                return new Promise(function (callable $resolve, callable $reject) use ($movie) {
                    DirectorBuffer::loadBuffered();
                    $resolve(DirectorBuffer::get($movie['directorId']));
                });
            }
        ]
    ]
]);

$query = '
query HeroNameQuery($id: ID!) {
  hero(id: $id) {
    name
  }
}';

$variables = ['id' => '1000'];

$result = graphql($schema, $query, null, null, $variables);

$contextValues = [
    'currentlyLoggedInUser' => $currentlyLoggedInUser,
];

$result = graphql($schema, $query, null, $contextValues, $variables);

$dateType = newScalarType([
    'name'         => 'Date',
    'serialize'    => function ($value) {
        if ($value instanceof DateTime) {
            return $value->format('Y-m-d');
        }
        return null;
    },
    'parseValue'   => function ($value) {
        if (\is_string($value)){
            return new DateTime($value);
        }
        return null;
    },
    'parseLiteral' => function ($node) {
        if ($node instanceof StringValueNode) {
            return new DateTime($node->getValue());
        }
        return null;
    },
]);

$schema = buildSchema($source, [
    'Query' => QueryResolver::class,
    [
        'types' => [$dateType],
    ],
]);

class GraphQLService
{
    private $schema;

    public function __construct(Schema $schema)
    {
        $this->schema = $schema;
    }

    public function executeQuery(string $query, array $variables, ?string $operationName): array
    {
        return graphql($this->schema, $query, null, null, $variables, $operationName);
    }
}

class GraphQLServiceProvider
{
    public function register()
    {
        $this->app->singleton(GraphQLService::class, function () {
            $schemaDef = \file_get_contents(__DIR__ . '/schema.graphqls');

            $executableSchema = buildSchema($schemaDef, [
                'Query' => QueryResolver::class,
            ]);

            return new GraphQLService($executableSchema);
        });
    }
}

class GraphQLController extends Controller
{
    private $graphqlService;

    public function __construct(GraphQLService $graphqlService)
    {
        $this->graphqlService = $graphqlService;
    }

    public function handle(Request $request): JsonResponse
    {
        $query         = $request->get('query');
        $variables     = $request->get('variables') ?? [];
        $operationName = $request->get('operationName');

        $result = $this->graphqlService->executeQuery($query, $variables, $operationName);

        return response()->json($result);
    }
}

Route::post('/graphql', 'app\GraphQL\GraphQLController@handle');