Authenticate on service start

registry/service/options.go

@@ -0,0 +1,21 @@
+package service
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/v2/client"
+	"github.com/micro/go-micro/v2/registry"
+)
+
+type clientKey struct{}
+
+// WithClient sets the RPC client
+func WithClient(c client.Client) registry.Option {
+	return func(o *registry.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+
+		o.Context = context.WithValue(o.Context, clientKey{}, c)
+	}
+}