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event hooks for python

Project description

panglery is a library for writing hooks for events in python.

Here’s a basic example of usage:

import panglery
p = panglery.Pangler()

@p.subscribe(event='example', needs=['spam'])
def example_hook(p, spam):
    print spam

p.trigger(event='example', spam='eggs')
# prints 'eggs'

And a little bit more involved:

@p.subscribe(needs=['spam'], returns=['spam'])
def modify_spam_hook(p, spam):
    spam = spam + ' spam'
    return {'spam': spam}

p.trigger(event='example', spam='eggs')
# prints 'eggs spam'

Hooks can also add parameters to an event which then trigger other hooks:

p = panglery.Pangler()

@p.subscribe(needs=['spam'], returns=['eggs'])
def make_eggs_hook(p, spam):
    eggs = spam + ' eggs'
    return {'eggs': eggs}

@p.subscribe(event='example', needs=['eggs']):
def eggs_hook(p, eggs):
    print eggs

p.trigger(event='example', spam='eggs')
# prints 'eggs eggs'

PanglerAggregates can be used to aggregate together multiple Panglers across all superclasses:

class ExampleBase(object):
    p = panglery.PanglerAggregate('hooks')
    hooks = panglery.Pangler()

    @hooks.subscribe(event='example')
    def example_hook_base(self, p):
        print 'spam'

class ExampleDerived(ExampleBase):
    hooks = panglery.Pangler()

    @hooks.subscribe(event='example')
    def example_hook_derived(self, p):
        print 'eggs'

inst = ExampleDerived()
inst.p().trigger(event='example')
# prints 'spam' and 'eggs' in some order.

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