Refactor request_size and response_size for grpc requester

Author: kgantsov

src/requester/grpc_requester.rs

@@ -178,16 +178,11 @@ impl<'a> Requester for GrpcRequester<'a> {
 
         let req_duration = start.elapsed();
 
-        // calculate request size
-        let encoded = req_msg.encode_to_vec();
-        let request_size = encoded.len();
-
-        // calculate response size
-        let encoded_resp = response.get_ref().encode_to_vec();
-        let response_size = encoded_resp.len();
+        let request_size = req_msg.encode_to_vec().len();
+        self.metrics.add_bytes_sent(request_size as u64).await;
 
+        let response_size = response.get_ref().encode_to_vec().len();
         self.metrics.add_bytes_received(response_size as u64).await;
-        self.metrics.add_bytes_sent(request_size as u64).await;
 
         self.metrics
             .record_latency(req_duration.as_micros().try_into().unwrap_or(0))