grpc c++ write log to file

[city invoker]

how can i write req/rsp info to a log file,with tracking request_id,i look at the grpcpp source code and found not support, i'm using c++ btw.

[Eugene Ostroukhov]

I am not sure what request_id you mean. You may get textual representation of the request or response by calling the DebugString message. ABSL log also has built-in support for proto messages:

::envoy::service::discovery::v3::DiscoveryRequest req;

req.add_resource_names("aaa");

gpr_log(GPR_ERROR, "%s", req.DebugString().c_str());

LOG(ERROR) << "ABSL log!" << req;