Manual mounting of Graphql endpoints

[cssArchitect]

Hello, @Papooch.

I have a question about setting up CLS in the middleware section. Specifically, I'm interested in setting up CLS for certain GraphQL operations (as an alternative to simple HTTP routes). Is there a way to do this?

@Module({
    imports: [
        ClsModule.forRoot({
            global: true,
            middleware: { mount: false },
        }),
    ],
    // ...
})
export class AppModule implements NestModule {
    configure(consumer: MiddlewareConsumer) {
        consumer.apply(ClsMiddleware).forRoutes('custom/route') // here I would like to specify concrete Graphq operations, like `query Users {...}`;
    }
}

Thanks in advance!

[Papooch]

I'm afraid that's not possible, or at least not this simple. This way of binding middleware only works for HTTP routes.

If you want a more granular way, you'd have to create a custom middleware or interceptor or something that wraps the request, and based on some condition, wrap the rest of the execution flow with cls.run without using the built-in ClsMiddleware.

I would suggest that you look at the code of the core library under cls-initializers to get the idea.

But I'm afraid that this level of granularity of initializing the CLS context would only lead to confusion in the future, because you can't be sure when it's actually initialized.

[cssArchitect]

Yes, you are right, this isn't so trivial, especially in the case of middleware, since Nest only provides needed ArgumentsHost in guards, filters, and interceptors. Thank you, I will look for a custom implementation.