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I define support for hookable instance methods.
These are methods which you can register pre-call and post-call external
functions to augment their functionality. People familiar with more esoteric
languages may think of these as "method combinations".
This could be used to add optional preconditions, user-extensible callbacks
(a-la emacs) or a thread-safety mechanism.
The four exported calls are:
- L{addPre}
- L{addPost}
- L{removePre}
- L{removePost}
All have the signature (class, methodName, callable), and the callable they
take must always have the signature (instance, *args, **kw) unless the
particular signature of the method they hook is known.
Hooks should typically not throw exceptions, however, no effort will be made by
this module to prevent them from doing so. Pre-hooks will always be called,
but post-hooks will only be called if the pre-hooks do not raise any exceptions
(they will still be called if the main method raises an exception). The return
values and exception status of the main method will be propogated (assuming
none of the hooks raise an exception). Hooks will be executed in the order in
which they are added.
iÿÿÿÿNt HookErrorc B s e Z d Z RS( s7 An error which will fire when an invariant is violated.( t __name__t
__module__t __doc__( ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyR + s c C s t | | t | ƒ d S( su hook.addPre(klass, name, func) -> None
Add a function to be called before the method klass.name is invoked.
N( t _addHookt PRE( t klasst namet func( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyt addPre. s c C s t | | t | ƒ d S( su hook.addPost(klass, name, func) -> None
Add a function to be called after the method klass.name is invoked.
N( R t POST( R R R ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyt addPost6 s c C s t | | t | ƒ d S( s¡ hook.removePre(klass, name, func) -> None
Remove a function (previously registered with addPre) so that it
is no longer executed before klass.name.
N( t _removeHookR ( R R R ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyt removePre= s c C s t | | t | ƒ d S( s¡ hook.removePre(klass, name, func) -> None
Remove a function (previously registered with addPost) so that it
is no longer executed after klass.name.
N( R R
( R R R ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyt
removePostF s s3
import %(module)s
def %(name)s(*args, **kw):
klazz = %(module)s.%(klass)s
for preMethod in klazz.%(preName)s:
preMethod(*args, **kw)
try:
return klazz.%(originalName)s(*args, **kw)
finally:
for postMethod in klazz.%(postName)s:
postMethod(*args, **kw)
s __hook_pre_%s_%s_%s__s __hook_post_%s_%s_%s__s __hook_orig_%s_%s_%s__c C s, | t j | j d d ƒ | j | f } | S( s string manipulation garbaget .t _( t stringt replaceR R ( t kt nt st x( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyt _XXXd s (c C s t | | t ƒ S( sC (private) munging to turn a method name into a pre-hook-method-name( R t _PRE( R R ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyR i s c C s t | | t ƒ S( sD (private) munging to turn a method name into a post-hook-method-name( R t _POST( R R ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyR
m s c C s t | | t ƒ S( sE (private) munging to turn a method name into an `original' identifier( R t _ORIG( R R ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyt ORIGq s c C sj t | | ƒ t | | | | ƒ ƒ sA t | | | | ƒ g ƒ n t | | | | ƒ ƒ } | j | ƒ d S( s, (private) adds a hook to a method on a classN( t _enhookt hasattrt setattrt getattrt append( R R t phaseR t phaselist( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyR v s
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rˆ t d | | f ƒ ‚ n Xt | t | | ƒ ƒ rË t | t | | ƒ ƒ rË t | | ƒ n d S( s1 (private) removes a hook from a method on a classs no hooks present!s( hook %s not found in removal list for %sN( R R R R t removet
ValueErrorR R
t _dehook( R R R! R t
phaselistnameR" ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyR s
2c sÀ t ˆ t ˆ ˆ ƒ ƒ r d S‡ ‡ f d † } y
ˆ | _ Wn t k
rN n Xt ˆ ˆ ƒ j } t ˆ t ˆ ˆ ƒ | ƒ t ˆ t ˆ ˆ ƒ g ƒ t ˆ t ˆ ˆ ƒ g ƒ t ˆ ˆ | ƒ d S( s> (private) causes a certain method name to be hooked on a classNc s‹ x- t ˆ t ˆ ˆ ƒ ƒ D] } | | | Ž q Wz# t ˆ t ˆ ˆ ƒ ƒ | | Ž SWd x- t ˆ t ˆ ˆ ƒ ƒ D] } | | | Ž qo WXd S( N( R R R R
( t argst kwt preMethodt
postMethod( R R ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyt newfunc• s # ( R R t func_namet TypeErrorR t im_funcR R R
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c C s t | t | | ƒ ƒ s' t d ƒ ‚ n t | | t | t | | ƒ ƒ ƒ t | t | | ƒ ƒ t | t | | ƒ ƒ t | t | | ƒ ƒ d S( sH (private) causes a certain method name no longer to be hooked on a classs Cannot unhook!N( R R R R R t delattrR R
( R R ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyR% © s "( R R t ExceptionR R R R
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R R R R R% ( ( ( s7 /usr/lib/python2.7/dist-packages/twisted/python/hook.pyt <module>$ s$