Enable function to be created outside of StartHandler. (#192)

Author: efritz

lambda/entry.go

@@ -53,9 +53,7 @@ func StartHandler(handler Handler) {
 	if err != nil {
 		log.Fatal(err)
 	}
-	function := new(Function)
-	function.handler = handler
-	err = rpc.Register(function)
+	err = rpc.Register(NewFunction(handler))
 	if err != nil {
 		log.Fatal("failed to register handler function")
 	}

lambda/function.go

@@ -16,6 +16,10 @@ type Function struct {
 	handler Handler
 }
 
+func NewFunction(handler Handler) *Function {
+	return &Function{handler: handler}
+}
+
 func (fn *Function) Ping(req *messages.PingRequest, response *messages.PingResponse) error {
 	*response = messages.PingResponse{}
 	return nil