Merge pull request #2037 from murgatroid99/grpc-js_dns_backoff_ip_reset

grpc-js: Fix `exitIdle` propagation and DNS IP result backoff

Author: murgatroid99

packages/grpc-js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@grpc/grpc-js",
-  "version": "1.5.3",
+  "version": "1.5.4",
   "description": "gRPC Library for Node - pure JS implementation",
   "homepage": "https://grpc.io/",
   "repository": "https://github.com/grpc/grpc-node/tree/master/packages/grpc-js",

packages/grpc-js/src/load-balancer-child-handler.ts

@@ -125,9 +125,9 @@ export class ChildLoadBalancerHandler implements LoadBalancer {
   }
   exitIdle(): void {
     if (this.currentChild) {
-      this.currentChild.resetBackoff();
+      this.currentChild.exitIdle();
       if (this.pendingChild) {
-        this.pendingChild.resetBackoff();
+        this.pendingChild.exitIdle();
       }
     }
   }

packages/grpc-js/src/resolver-dns.ts

@@ -144,6 +144,7 @@ class DnsResolver implements Resolver {
     if (this.ipResult !== null) {
       trace('Returning IP address for target ' + uriToString(this.target));
       setImmediate(() => {
+        this.backoff.reset();
         this.listener.onSuccessfulResolution(
           this.ipResult!,
           null,