Injector-enabled Python application microframework
Project description
Cask is Injector-enabled, Python application microframework modelled after Flask.
It’s purpose is to make the amount of boilerplate you need to write when developing your application smaller. Here’s a simple example:
>>> from cask import Cask
>>> from injector import inject
>>>
>>> def configure(binder):
... binder.bind(str, to='ABC')
...
>>> @Cask.run_main(modules=[configure])
... @inject(s=str)
... def main(s):
... print(s)
...
ABCCask.run_main (it works both as class and instance method, see below) does the if __name__ == '__main__' check for you. So this
>>> app = Cask()
>>> @app.run_main
... def main():
... print(111)
...
111is shorter version of
>>> app = Cask()
>>> @app.main
... def main():
... print(222)
...
>>> if __name__ == '__main__':
... app.run()
...
222Construction
Cask constructor and Cask.run_main class method accept the following optional keyword arguments:
modules - iterable of Injector modules, defaults to empty sequence
injector- instance of Injector to configure and use, by default new instance will be created for you
Hooks
Cask instance provides the following decorators allowing you to register hooks (note that you can inject into registered functions):
Cask.before_main - should expect no parameters, if non-None value is returned application execution main function won’t be executed
Cask.after_main - should expect single result parameter and return processed result (modified or not)
Cask.exception_handler(ExceptionCLass) - will handle exception raised during the application execution, should expect single argument called e and containing exception value:
>>> app = Cask() >>> @app.exception_handler(Exception) ... def handle(e): ... print('got exception %s' % (e,)) ... >>> @app.run_main ... def main(): ... raise Exception(123) ... got exception 123Cask.main - main function should expect no arguments and may return something
You can, of course, register more than one callable for hooks other than main.
Execution
This is what happens when you run Cask-based application:
Injector is configured using provided modules
before_main hooks are called
If before_main hooks didn’t return value different than None, main hook is executed
after_main hooks are called
Copyright
Copyright (C) 2013 Jakub Stasiak
This source code is licensed under MIT license, see LICENSE file for details.
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