Cask
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)
...
ABC
Cask.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)
...
111
is shorter version of
>>> app = Cask()
>>> @app.main
... def main():
... print(222)
...
>>> if __name__ == '__main__':
... app.run()
...
222
Construction
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 singleresult
parameter and return processed result (modified or not) -
Cask.exception_handler(ExceptionCLass)
- will handle exception raised during the application execution, should expect single argument callede
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 123
-
Cask.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
.
Note
Only first matching exception_handler
hook will be called, if any.
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.