drop AuthTLS option and use client TLSConfig option

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

grpc.go

@@ -35,13 +35,10 @@ type grpcClient struct {
 // secure returns the dial option for whether its a secure or insecure connection
 func (g *grpcClient) secure(addr string) grpc.DialOption {
 	// first we check if theres'a  tls config
-	if g.opts.Context != nil {
-		if v := g.opts.Context.Value(tlsAuth{}); v != nil {
-			tls := v.(*tls.Config)
-			creds := credentials.NewTLS(tls)
-			// return tls config if it exists
-			return grpc.WithTransportCredentials(creds)
-		}
+	if g.opts.TLSConfig != nil {
+		creds := credentials.NewTLS(g.opts.TLSConfig)
+		// return tls config if it exists
+		return grpc.WithTransportCredentials(creds)
 	}
 
 	// default config

options.go

@@ -3,7 +3,6 @@ package grpc
 
 import (
 	"context"
-	"crypto/tls"
 
 	"github.com/unistack-org/micro/v3/client"
 	"google.golang.org/grpc"
@@ -72,16 +71,6 @@ func Codec(contentType string, c encoding.Codec) client.Option {
 	}
 }
 
-// AuthTLS should be used to setup a secure authentication using TLS
-func AuthTLS(t *tls.Config) client.Option {
-	return func(o *client.Options) {
-		if o.Context == nil {
-			o.Context = context.Background()
-		}
-		o.Context = context.WithValue(o.Context, tlsAuth{}, t)
-	}
-}
-
 //
 // MaxRecvMsgSize set the maximum size of message that client can receive.
 //