StreamingDetectIntent doesn't process audio after stream reset in node.js v14 & v16

[nishantt95]

This issue is in regards to this context googleapis/nodejs-dialogflow-cx#178

Environment details

• OS: Windows 10. Debian 9 (stretch)
• Node.js version: v14.16.0, v16.13.2
• @google-cloud/dialogflow-cx version: 2.15.0

Issue
To process audio requests continuously, it was suggested to reset the detectStream/requestStream after receiving the response from Dialogflow CX server. This solution worked as expected for node.js v12. However, the same implementation failed for Node v14 & v16.

So, when we call detectStream.end() (in all Node.js versions), we do receive an end callback which means that it is ending the connection but when we recreate a detectStream object (in v14, v16) we don't receive any error but not even able to receive any response (transcription/audio response) for the audio request being sent. This same implementation works for v12.

Instead of calling detectStream.end(), I tried calling detectStream.cancel() and then recreated a detectStream object and now it is working as expected even for v14, v16. But in exchange we get a gRPC error "1 CANCELLED".

Now my question is:

1. Why detectStream.end() is not working as expected in v14, v16 but works fine for v12?

2. Is calling detectStream.cancel() is the right way to proceed?

For code snippet please refer here googleapis/nodejs-dialogflow-cx#178