Change the arguments when backoff occurs

[Jeffrey04]

Suppose I have a function that sends a HTTP request with a token that is to be refreshed every N minutes that is not under my control. So I wrap the token fetching request into a separate closure that can be called whenever needed.

def token_fetcher():
    token = None

    def _fetcher(renew):
        nonlocal token
        if token is None or renew:
            token = do_something_to_fetch_the_token()

        return token

    return _fetcher

and my actual function doing HTTP request

def do_http_request(query, token_fetcher, renew=False):
    return requests.get('http://example.com/request', param=query, header=token_fetcher(renew))

So is it possible to make backoff to flip renew into True if backoff happens? (second trial onwards)

[bgreen-litl]

Could you do something like this?

def do_http_request(query):
    token = None
    renew = False

    def set_renew(details):
        nonlocal renew
        renew = True

    def token_fetcher():
        nonlocal token
        nonlocal renew
        if token is None or renew:
            token = do_something_to_fetch_the_token()

        return token

    @backoff.on_exception([...], on_backoff=set_renew)
    def _do_http_request():
        return requests.get('http://example.com/request', param=query, header=token_fetcher(renew))

    _do_http_request()

[Jeffrey04]

oh ok whacks head
thanks (: