Support endpoint metadata

server/handler.go

@@ -34,6 +34,7 @@ type Subscriber interface {
 
 type HandlerOptions struct {
 	Internal bool
+	Metadata map[string]map[string]string
 }
 
 type SubscriberOptions struct {
@@ -50,6 +51,14 @@ func InternalHandler(b bool) HandlerOption {
 	}
 }
 
+// EndpointMetadata is a Handler option that allows metadata to be added to
+// individual endpoints.
+func EndpointMetadata(endpoint string, metadata map[string]string) HandlerOption {
+	return func(o *HandlerOptions) {
+		o.Metadata[endpoint] = metadata
+	}
+}
+
 // Internal Subscriber options specifies that a subscriber is not advertised
 // to the discovery system.
 func InternalSubscriber(b bool) SubscriberOption {