CODEWITHSUNDEEP
c++backendgrpcinterceptor
lef
lef

Reputation: 69

GRPC C++ fail call in an interceptor before server endpoint is reached

I want to fail a grpc call based on a condition, ideally the interceptor returns an http error to the client before the rpc implementation on the server is reached. The interceptor is on the server side. I know my interceptor gets called since I get log output, but no matter which function from the reference I try the rpc functions on the server get normally.

I am also a little confused about the Interception Hooks. If I understand correctly the PRE_SEND_MESSAGE hook is called right after the metadata is sent where I have access to the message that was sent from the client.

void RejectInteceptor::Intercept(InteceptionHookPoints methods) {
  if (methods->QueryInterceptionHookPoint(InterceptionHookPoints::PRE_SEND_MESSAGE)) {
    if (checkBackendTask()) {
      std::cout << "Fail the rpc call" << std::endl;
      Status status(StatusCode::UNAVAILABLE, "Service unavailable");
      methods->ModifySendStatus(status);
      methods->FailHijackedRecvMessage();
      return;
    }
    methods->Proceed();
  }
}

Upvotes: 0

Views: 38

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