Having difficulty with decorators - trying to get Google Cloud Functions working

[nbrandaleone]

Hello Hy community!

I am trying to get a Hy script to be properly translated into Python, so that Google Functions Framework will accept the code. Ultimately, I want to upload it to Google Cloud Functions.

The Python code should look like the following:

import functions_framework

@functions_framework.http
def hello(request):
    return 'Hello world!'

Unfortunately, I can't get the decorator to create the signature properly. It ALWAYS puts a set of function parens on the end.
The best I can get is below - which does not work with the Functions-Framework Google python library:

import functions_framework

@functions_framework.http()
def hello(request):
    return 'Hello world!'

My source Hy code is below. I am using hy2py for the conversion.

(import functions_framework)

;; Function is passed a single parameter, `request`,
;; which is a Flask REQUEST object
(defn [(.http functions-framework)] hello [request]
  "Hello world!")

Any help would be appreciated. Although a long-time lisp user, I am new to Hy.

Thanks,
Nick

[Kodiologist]

The implicit call works the same as in Hy as in Python. You need to write (defn [functions-framework.http] …) or (defn [(. functions-framework http)] …) in Hy to get @functions_framework.http in Python.

Don't forget that decorators are little more than syntactic sugar for higher-order functions anyway. You can always say e.g. (setv hello (functions-framework.http (fn [request] …))).

[nbrandaleone]

Thanks! I will give it a try.

Nick

[goyalyashpal]

I will give it a try.

did it worK?

[nbrandaleone]

It did work - thank you again!
I wrote it up in a blog article. See: https://medium.com/google-cloud/three-lisps-on-gcp-cloud-functions-43927b98dcbd

Nick