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Add a way for actors to access the current message #208

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nachopro opened this issue Apr 11, 2019 · 2 comments

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@nachopro
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commented Apr 11, 2019

Hello. I have an Actor (function) and I need to know if it is the first or fifth execution.
(based on his retry number I must execute a complementary code)

Maybe I should use a middleware or pipeline?

Thanks for your time.

@Bogdanp

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commented Apr 12, 2019

Can you use retry_when?

def should_retry(retries_so_far, e):
  ...

@actor(retry_when=should_retry)
def some_fn():
  ...

Otherwise, you can define a middleware that exposes the current message using a thread-local variable:

class CurrentMessage(Middleware):
    STATE = local()

    @classmethod
    def get_current_message():
        return getattr(CurrentMessage.STATE, "message", None)

    def before_process_message(self, broker, message):
        setattr(self.STATE, "message", message)

    def after_process_message(self, broker, message, *, result=None, exception=None):
        delattr(self.STATE, "message")

I'll probably add something like this to one of the upcoming versions since having access to the current message can sometimes be useful.

@Bogdanp Bogdanp added the enhancement label Apr 12, 2019

@Bogdanp Bogdanp changed the title How can I know the retry number? Add a way for actors to access the current message Apr 12, 2019

@Bogdanp Bogdanp added this to the v1.7.0 milestone Apr 12, 2019

@Bogdanp Bogdanp closed this in 48e59ec Apr 15, 2019

@Bogdanp Bogdanp modified the milestones: v1.7.0, v1.6.0 Apr 15, 2019

@nachopro

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commented Apr 15, 2019

@Bogdanp I was away from the PC these days :(
I switched my code to work with callbacks (with some introduced bugs :P) but this feature is a great solution!

I'm very glad with your response. Thanks you very much.

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