July 2017
Beginner to intermediate
340 pages
7h 43m
English
Content preview from Python Microservices Development
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Signals
Flask integrates with Blinker (https://pythonhosted.org/blinker/), which is a signal library that lets you subscribe a function to an event.
Events are instances of the blinker.signal class created with a unique label, and Flask instantiates ten of them in 0.12. Flask triggers signals at critical moments during the processing of a request. Refer to http://flask.pocoo.org/docs/latest/api/#core-signals-list for the full list.
Registering to a particular event is done by calling the signal's connect method. Signals are triggered when some code calls the signal's send method. The send method accepts extra arguments to pass data to all the registered functions.
In the following example, we register the finished function to the request_finished ...
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