gRPC Node.js OS Question

[Ian Crena Geckeler]

Hello Google gRPC Team!

My name's Ian, and I have a quick question about gRPC-Node. 

On the documentation, InterceptorProvider is listed as a global method however, my team cannot find that method on the grpc object. 

Any insight into how to access this method, or how else we might define interceptors and attach them to a service-method on the client/stub would be super helpful. Thank you, and have a terrific week!

Best,

Ian

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Ian Geckeler

USC | Class of 2019

Computational Mathematics

[Michael Lumish]

This is one area where our API documentation is not great. interceptorProvider is a function type, not an exported function. In the Client constructor options parameter, two of the available options are "interceptors" and "interceptor_providers", which take an array of Interceptors and an array of InterceptorProviders, respectively.

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[Ian Crena Geckeler]

Thank you for this response Michael, this has been super helpful and we've been able to fully implement interceptors now! I actually had another question and was wondering if you might be able to provide a bit of direction for me. Any thoughts would be awesome! Here's where we're at:

I have a server-side streaming service-method on the client.

const numberStream = stub.streamNumbers(
  { number: 5 },
  meta,
  {
    interceptors: [interceptorProvider]
  },
  {}
);

When I cancel the method from the client with...

numberStream.cancel()

My client side interceptor detects a cancelled event. But my server remains unaware of the cancellation.

The cancelled property remains "false", and my event listener for

call.on("cancelled",()=>{


})

does not fire. Any chance you might know where my problem lies?

(snippet from server side streaming service method)

function streamNumbers(call) {


  call.on("cancelled", () => {
    console.log("cancelled");
    call.end();
  });


  console.log(call.__proto__.__proto__);


}