drop AuthTLS option and use server TLSConfig option

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

grpc.go

@@ -188,10 +188,8 @@ func (g *grpcServer) getMaxMsgSize() int {
 }
 
 func (g *grpcServer) getCredentials() credentials.TransportCredentials {
-	if g.opts.Context != nil {
-		if v, ok := g.opts.Context.Value(tlsAuth{}).(*tls.Config); ok && v != nil {
-			return credentials.NewTLS(v)
-		}
+	if g.opts.TLSConfig != nil {
+		return credentials.NewTLS(g.opts.TLSConfig)
 	}
 	return nil
 }

options.go

@@ -2,7 +2,6 @@ package grpc
 
 import (
 	"context"
-	"crypto/tls"
 
 	"github.com/unistack-org/micro/v3/server"
 	"google.golang.org/grpc"
@@ -12,7 +11,6 @@ import (
 type codecsKey struct{}
 type grpcOptions struct{}
 type maxMsgSizeKey struct{}
-type tlsAuth struct{}
 type reflectionKey struct{}
 
 // gRPC Codec to be used to encode/decode requests for a given content type
@@ -30,11 +28,6 @@ func Codec(contentType string, c encoding.Codec) server.Option {
 	}
 }
 
-// AuthTLS should be used to setup a secure authentication using TLS
-func AuthTLS(t *tls.Config) server.Option {
-	return setServerOption(tlsAuth{}, t)
-}
-
 // Options to be used to configure gRPC options
 func Options(opts ...grpc.ServerOption) server.Option {
 	return setServerOption(grpcOptions{}, opts)