From 62bd1cab6875d1127268db46d75092ffdbc59090 Mon Sep 17 00:00:00 2001
From: Michael Lumish <mlumish@google.com>
Date: Mon, 31 Aug 2020 09:55:29 -0700
Subject: [PATCH] Add granular verbosity option to xDS interop client

---
 .../grpc-js/interop/xds-interop-client.ts     | 22 ++++++++++++++-----
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/packages/grpc-js/interop/xds-interop-client.ts b/packages/grpc-js/interop/xds-interop-client.ts
index 949da238..3009541c 100644
--- a/packages/grpc-js/interop/xds-interop-client.ts
+++ b/packages/grpc-js/interop/xds-interop-client.ts
@@ -39,6 +39,8 @@ const loadedProto = grpc.loadPackageDefinition(packageDefinition) as unknown as
 
 const REQUEST_TIMEOUT_SEC = 20;
 
+const VERBOSITY = Number.parseInt(process.env.NODE_XDS_INTEROP_VERBOSITY ?? '0');
+
 interface CallEndNotifier {
   onCallSucceeded(peerName: string): void;
   onCallFailed(message: string): void;
@@ -54,7 +56,9 @@ class CallSubscriber {
   constructor(private callGoal: number, private onFinished: () => void) {}
 
   addCallStarted(): void {
-    console.log('Call started');
+    if (VERBOSITY >= 2) {
+      console.log('Call started');
+    }
     this.callsStarted += 1;
   }
 
@@ -65,7 +69,9 @@ class CallSubscriber {
   }
 
   addCallSucceeded(peerName: string): void {
-    console.log(`Call to ${peerName} succeeded`);
+    if (VERBOSITY >= 2) {
+      console.log(`Call to ${peerName} succeeded`);
+    }
     if (peerName in this.callsSucceededByPeer) {
       this.callsSucceededByPeer[peerName] += 1;
     } else {    
@@ -76,7 +82,9 @@ class CallSubscriber {
     this.maybeOnFinished();
   }
   addCallFailed(message: string): void {
-    console.log(`Call failed with message ${message}`);
+    if (VERBOSITY >= 2) {
+      console.log(`Call failed with message ${message}`);
+    }
     this.callsFinished += 1;
     this.failureMessageCount.set(message, (this.failureMessageCount.get(message) ?? 0) + 1);
     this.maybeOnFinished();
@@ -87,9 +95,11 @@ class CallSubscriber {
   }
 
   getFinalStats(): LoadBalancerStatsResponse {
-    console.log(`Out of a total of ${this.callGoal} calls requested, ${this.callsFinished} finished. ${this.callsSucceeded} succeeded`);
-    for (const [message, count] of this.failureMessageCount) {
-      console.log(`${count} failed with the message ${message}`);
+    if (VERBOSITY >= 1) {
+      console.log(`Out of a total of ${this.callGoal} calls requested, ${this.callsFinished} finished. ${this.callsSucceeded} succeeded`);
+      for (const [message, count] of this.failureMessageCount) {
+        console.log(`${count} failed with the message ${message}`);
+      }
     }
     return {
       rpcs_by_peer: this.callsSucceededByPeer,