HotChocolate:如何访问"connection_init“负载

Question

我们在connection_init期间发送额外的有效载荷(用于阿波罗的https://github.com/apollographql/subscriptions-transport-ws中的connectionParams)。

我在官方来源中找不到任何关于如何提取这些信息的信息，也找不到任何关于消息中间件/处理程序的信息。

并发解决方案graphql-dotnet允许我像这样实现IOperationMessageListener

public class SusbcriptionInitListener: IOperationMessageListener
{
    public Task BeforeHandleAsync(MessageHandlingContext context) => Task.CompletedTask;
    
    // This method will be triggered with every incoming message
    public async Task HandleAsync(MessageHandlingContext context)
    {
        var message = context.Message;
        
        // I can then filter for specific message type and do something with the raw playload
        if (message.Type == MessageType.GQL_CONNECTION_INIT)
        {
            string myInformation = message.Payload.GetValue("MyInfomration").ToString();
            
            DoSomethingWithMyInformation(myInformation);
        }
    }

    public Task AfterHandleAsync(MessageHandlingContext context) => Task.CompletedTask;
}

HC有没有提供类似的东西？

Answer 1

您要查找的是ISocketSessionInterceptor

services
   AddGraphQLServer()
   ... Your Config
   .AddSocketSessionInterceptor<AuthenticationSocketInterceptor>();

public interface ISocketSessionInterceptor
    {
        ValueTask<ConnectionStatus> OnConnectAsync(
            ISocketConnection connection,
            InitializeConnectionMessage message,
            CancellationToken cancellationToken);

        ValueTask OnRequestAsync(
            ISocketConnection connection,
            IQueryRequestBuilder requestBuilder,
            CancellationToken cancellationToken);

        ValueTask OnCloseAsync(
            ISocketConnection connection,
            CancellationToken cancellationToken);
    }

您可以通过覆盖OnConnectAsync来访问连接请求负载。

InitializeConnectionMessage包含一个保存有效负载的Payload属性