fix: separate T-Bank RPC network time from queue wait (WealthLedger/backend#81) (#94)

src/integrations/tbank/tbank.client.ts

@@ -64,6 +64,7 @@ type TbankClientService = Client & Record<string, Unary<never, never>>;
 type RpcDiagnostics = {
   channelState?: string;
   headersReceived?: boolean;
+  networkMs?: number;
   queueWaitMs?: number;
   trackingId?: string;
 };
@@ -524,10 +525,13 @@ export class TbankClient {
           throw new ServiceUnavailableException({ code: TbankErrorCode.Unavailable });
         }
         const response = await this.queue.run(() => {
-          diagnostics.queueWaitMs = Math.round(performance.now() - startedAt);
+          const sentAt = performance.now();
+          diagnostics.queueWaitMs = Math.round(sentAt - startedAt);
           return this.request<Response>(
             token, client, method, request, diagnostics,
-          );
+          ).finally(() => {
+            diagnostics.networkMs = Math.round(performance.now() - sentAt);
+          });
         });
         this.logger.event('debug', 'tbank.rpc.completed', {
           operation: method,