Google Logging v2 Tails log entry streaming always returns Ok(None) values

[jk-gan]

Context:

I am using tonic-build to generate client code for the Google Logging v2 Tails log entry API, which provides a streaming endpoint to retrieve log entries in real-time. However, when I use the generated code to call the API and consume the stream, I consistently receive Ok(None) values from the response stream using the message() method.

Specifics:

• I am using Tonic version 0.9.2 and Rust version 1.69.0
• I have generated the client code using tonic-build and have not made any modifications to it
• I have verified that the server is running and reachable (using ListLogEntriesRequest generated by tonic-build and also using grpcurl)
• I have tried using grpcurl to call the same API, but receive data successfully

grpcurl -vv -protoset logging.protoset -H "Authorization: Bearer $GOOGLE_OAUTH_TOKEN" -d @ logging.googleapis.com:443 google.logging.v2.LoggingServiceV2/TailLogEntries

# with
{"resource_names": ["projects/xxx"]}

• reproducible code: https://github.com/jk-gan/tonic-google-logging-api-sample (need to add your own access token and resource name)

Questions:

• Has anyone else experienced a similar issue with the Google Logging v2 Tails log entry API?
• Are there any known issues or workarounds for this issue?
• Are there any additional steps or troubleshooting techniques that I can try to resolve this issue?

Thank you in advance for any assistance or feedback that you can provide!