# 事件(Events)

这个引用列表 Lighthouse 分派的事件在一个请求的执行顺序。

所有事件都位于命名空间 \Nuwave\Lighthouse\Events 中。

# StartRequest

<?php

namespace Nuwave\Lighthouse\Events;

use Carbon\Carbon;
use Nuwave\Lighthouse\Execution\GraphQLRequest;

/**
 * Fires right after a request reaches the GraphQLController.
 *
 * Can be used for logging or for measuring and monitoring
 * the time a request takes to resolve.
 *
 * @see \Nuwave\Lighthouse\Support\Http\Controllers\GraphQLController
 */
class StartRequest
{
    /**
     * GraphQL request instance.
     *
     * @var \Nuwave\Lighthouse\Execution\GraphQLRequest
     */
    public $request;

    /**
     * The point in time when the request started.
     *
     * @var \Carbon\Carbon
     */
    public $moment;

    /**
     * StartRequest constructor.
     *
     * @param  \Nuwave\Lighthouse\Execution\GraphQLRequest  $request
     * @return void
     */
    public function __construct(GraphQLRequest $request)
    {
        $this->request = $request;
        $this->moment = Carbon::now();
    }
}

# BuildSchemaString

<?php

namespace Nuwave\Lighthouse\Events;

/**
 * Fires before building the AST from the user-defined schema string.
 *
 * Listeners may return a schema string,
 * which is added to the user schema.
 *
 * Only fires once if schema caching is active.
 */
class BuildSchemaString
{
    /**
     * The root schema that was defined by the user.
     *
     * @var string
     */
    public $userSchema;

    /**
     * BuildSchemaString constructor.
     *
     * @param  string  $userSchema
     * @return void
     */
    public function __construct(string $userSchema)
    {
        $this->userSchema = $userSchema;
    }
}

# ManipulateAST

<?php

namespace Nuwave\Lighthouse\Events;

use Nuwave\Lighthouse\Schema\AST\DocumentAST;

/**
 * Fires after the AST was built but before the executable schema is built.
 *
 * Listeners may mutate the $documentAST and make programmatic
 * changes to the schema.
 *
 * Only fires once if schema caching is active.
 */
class ManipulateAST
{
    /**
     * The AST that can be manipulated.
     *
     * @var \Nuwave\Lighthouse\Schema\AST\DocumentAST
     */
    public $documentAST;

    /**
     * BuildSchemaString constructor.
     *
     * @param  \Nuwave\Lighthouse\Schema\AST\DocumentAST
     * @return void
     */
    public function __construct(DocumentAST &$documentAST)
    {
        $this->documentAST = $documentAST;
    }
}

# RegisterDirectiveNamespaces

<?php

namespace Nuwave\Lighthouse\Events;

/**
 * Fires when the directive factory is constructed.
 *
 * Listeners may return one or more strings that are used as the base
 * namespace for locating directives.
 *
 * @see \Nuwave\Lighthouse\Schema\Factories\DirectiveFactory
 */
class RegisterDirectiveNamespaces
{
    //
}

# StartExecution

<?php

namespace Nuwave\Lighthouse\Events;

use Carbon\Carbon;

/**
 * Fires right before resolving an individual query.
 *
 * Might happen multiple times in a single request if
 * query batching is used.
 */
class StartExecution
{
    /**
     * The point in time when the query execution started.
     *
     * @var \Carbon\Carbon
     */
    public $moment;

    /**
     * StartRequest constructor.
     *
     * @return void
     */
    public function __construct()
    {
        $this->moment = Carbon::now();
    }
}

# BuildExtensionsResponse

<?php

namespace Nuwave\Lighthouse\Events;

/**
 * Fires after a query was resolved.
 *
 * Listeners of this event may return an instance of
 * @see \Nuwave\Lighthouse\Execution\ExtensionsResponse
 * that is then added to the response.
 */
class BuildExtensionsResponse
{
    //
}
<?php

namespace Nuwave\Lighthouse\Execution;

/**
 * May be returned from listeners of the event:
 * @see \Nuwave\Lighthouse\Events\BuildExtensionsResponse
 */
class ExtensionsResponse
{
    /**
     * Will be used as the key in the response map.
     *
     * @var string
     */
    protected $key;

    /**
     * JSON-encodable content of the extension.
     *
     * @var mixed
     */
    protected $content;

    /**
     * ExtensionsResponse constructor.
     *
     * @param  string  $key
     * @param  mixed  $content
     * @return void
     */
    public function __construct(string $key, $content)
    {
        $this->key = $key;
        $this->content = $content;
    }

    /**
     * Return the key of the extension.
     *
     * @return string
     */
    public function key(): string
    {
        return $this->key;
    }

    /**
     * Return the JSON-encodable content of the extension.
     *
     * @return mixed
     */
    public function content()
    {
        return $this->content;
    }
}

# ManipulateResult

<?php

namespace Nuwave\Lighthouse\Events;

use GraphQL\Executor\ExecutionResult;

/**
 * Fires after resolving each individual query.
 *
 * This gives listeners an easy way to manipulate the query
 * result without worrying about batched execution.
 */
class ManipulateResult
{
    /**
     * The result of resolving an individual query.
     *
     * @var \GraphQL\Executor\ExecutionResult
     */
    public $result;

    /**
     * ManipulateResult constructor.
     *
     * @param  \GraphQL\Executor\ExecutionResult  $result
     * @return void
     */
    public function __construct(ExecutionResult &$result)
    {
        $this->result = $result;
    }
}