Get client IP address from request gRPC

Let’s imagine that we need to get the client’s ip address from the request.

We have a service:

public class YourServiceImpl extends YourService.YourServiceImplBase {
  @Override 
  public void yourMethod() {
		...
	}
}

And the code for starting the gRPC server:

Server server = ServerBuilder                 
    .forPort(1234)                 
    .addService(new YourServiceImpl())                
    .build(); 
server.start(); 
server.awaitTermination();

Let’s create a new class:

class IPInterceptor implements ServerInterceptor {        
  @Override         
  public <ReqT, RespT> ServerCall.Listener<ReqT> interceptCall(ServerCall<ReqT, RespT> call, Metadata headers, ServerCallHandler<ReqT, RespT> next) {             
    String ipAddress = call.getAttributes().get(Grpc.TRANSPORT_ATTR_REMOTE_ADDR).toString(); 
    log.warn("Client IP address = {}", ipAddress); 
    return next.startCall(call, headers);         
	}
}

And register a new interceptor in the gRPC server launch code:

Server server = ServerBuilder                 
    .forPort(1234)                 
    .addService(new YourServiceImpl())
    .intercept(new IPInterceptor())                 
    .build(); 
server.start(); 
server.awaitTermination();

Done. If you need to pass the ip address from the interceptor to the YourServiceImpl service, then read this article: https://mchesnavsky.tech/share-data-between-interceptor-and-service-grpc.

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