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effect_performer idea #55

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25 changes: 25 additions & 0 deletions effect/_sync.py
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Original file line number Diff line number Diff line change
Expand Up @@ -63,3 +63,28 @@ def sync_wrapper(*args):
except:
box.fail(sys.exc_info())
return sync_wrapper


def effect_performer(f):
"""
A decorator for performers that return effect

The function being decorated is expected to take a dispatcher and an intent
(and not a box), and should return (dispatcher, effect) tuple. The returned
effect will be performed using returned dispatcher.

Example::

@effect_performer
def perform_foo(dispatcher, foo):
new_disp = ComposedDispatcher(
[special_dispatcher(foo.fields), dispatcher])
return new_disp, foo.effect
"""
@wraps(f)
def eff_wrapper(*args):
box = args[-1]
pass_args = args[:-1]
new_disp, eff = f(*pass_args)
perform(new_disp, eff, eff.on(box.succeed, box.fail))
return eff_wrapper