Merge pull request #575 from ydb-platform/unauthenticated

* Added exit from retryer if got grpc-error `Unauthenticated` on `dis…

Author: asmyasnikov

CHANGELOG.md

@@ -1,3 +1,5 @@
+* Added exit from retryer if got grpc-error `Unauthenticated` on `discovery/ListEndpoints` call  
+
 ## v3.42.9
 * Added `internal/xerrors.Errorf` error for wrap multiple errors and check them with `errors.Is` of `errors.As`
 * Fixed corner cases of `internal/wait.Wait`

internal/balancer/balancer.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"google.golang.org/grpc"
+	grpcCodes "google.golang.org/grpc/codes"
 
 	"github.com/ydb-platform/ydb-go-sdk/v3/config"
 	"github.com/ydb-platform/ydb-go-sdk/v3/discovery"
@@ -51,8 +52,11 @@ func (b *Balancer) OnUpdate(onApplyDiscoveredEndpoints func(ctx context.Context,
 func (b *Balancer) clusterDiscovery(ctx context.Context) (err error) {
 	if err = retry.Retry(ctx, func(childCtx context.Context) (err error) {
 		if err = b.clusterDiscoveryAttempt(childCtx); err != nil {
+			if xerrors.IsTransportError(err, grpcCodes.Unauthenticated) {
+				return xerrors.WithStackTrace(err)
+			}
 			// if got err but parent context is not done - mark error as retryable
-			if err != nil && ctx.Err() == nil && xerrors.IsTimeoutError(err) {
+			if ctx.Err() == nil && xerrors.IsTimeoutError(err) {
 				return xerrors.WithStackTrace(xerrors.Retryable(err))
 			}
 			return xerrors.WithStackTrace(err)