C++: Can I delete/reset/cancel an existing clientcontext deadline to set new clientcontext deadline?

[Rohan Chawhan]

Hey All,

I am using C++ to communicate with google speech api server.

I am using the usual approach of setting a deadline for the clientcontext to handle timeout functionality.

I have put the deadlines like:

void SetContextDeadline(grpc::ClientContext *context, unsigned int user_defined_deadline){

context->set_deadline(std::chrono::system_clock::now() + std::chrono::seconds(user_defined_deadline));

}

Now, this function is called whenever I want to set the deadline from now(time)

int main(){

  auto creds = grpc::GoogleDefaultCredentials();

  auto channel = grpc::CreateChannel("speech.googleapis.com", creds);
  std::unique_ptr<Speech::Stub> speech(Speech::NewStub(channel));

  grpc::ClientContext context;

// Set timeout of 8 seconds => also this is the timeout which I am not able to cancel to set new timer
// Whenever it ends (after 8 seconds) my program is terminated
  SetContextDeadline(&context,8);

  auto streamer = speech->StreamingRecognize(&context);

 // The microphone thread writes the audio content.

  std::thread microphone_thread(&MicrophoneThreadMain, streamer.get(),

                                file_path);

// Read responses.

  StreamingRecognizeResponse response;

  while (streamer->Read(&response)) {  // Returns false when no more to read.
    // Now I want to cancel the previous deadline to set this new deadline, everytime I enter this loop
    // I am seeing that this is setting the new deadline but the program still terminates at the older timeout
    SetContextDeadline(&context,8);

    // Dump the transcript of all the results.
    // Implementation of response display     

  }

}

Thanks in advance for your help

[Sidhartha Thota]

If I am not wrong, clientContext cannot be applied for streaming APIs. Thats what I saw from my experience. But I am happy to know if there is solution for this.

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Thanks,
Sidhartha Thota.

[Rohan Chawhan]

Hi Sidhartha,

So is there another way for applying timeouts on streaming APIs? specially in the given context? I basically want to solve the internet connection error for my code.

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Thanks,
Sidhartha Thota.

[Sidhartha Thota]

We used ClientWriter in our project and write() method fails if the other end/network is down. Check if read() will bailout in case of down event.

I am not aware of any other solution.

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Thanks,
Sidhartha Thota.