fix: Adding service provider configuration files to fix the grpc sink exception "Could not find policy 'pick_first'" (#203)

Shreyansh228 · Shreyansh · web-flow · commit 4237ead593b4 · 2022-11-17T15:09:32.000+05:30
In the current implementation, the gRPC client chooses default LoadBalancerProvider ('pick_first') and default NameResolverProvider(DNS). The implementation classes PickFirstLoadBalancerProvider and DnsNameResolverProvider respectively are missing.

We can handle the issue with the including implementation classes through service provider configuration files.
* SPI io.grpc.LoadBalancerProvider: io.grpc.internal.PickFirstLoadBalancerProvider
* SPI io.grpc.NameResolverProvider: io.grpc.internal.DnsNameResolverProvider

Co-authored-by: Shreyansh &lt;shreyansh.sangolli@gojek.com&gt;
diff --git a/src/main/resources/META-INF/services/io.grpc.LoadBalancerProvider b/src/main/resources/META-INF/services/io.grpc.LoadBalancerProvider
@@ -0,0 +1 @@
+io.grpc.internal.PickFirstLoadBalancerProvider
diff --git a/src/main/resources/META-INF/services/io.grpc.NameResolverProvider b/src/main/resources/META-INF/services/io.grpc.NameResolverProvider
@@ -0,0 +1 @@
+io.grpc.internal.DnsNameResolverProvider

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+io.grpc.internal.PickFirstLoadBalancerProvider`
Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	`+io.grpc.internal.DnsNameResolverProvider`