123 lines
3.7 KiB
Python
123 lines
3.7 KiB
Python
"""
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py lib plugins and plugin call management
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"""
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import py
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class MultiCall:
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""" execute a call into multiple python functions/methods. """
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def __init__(self, methods, kwargs, firstresult=False):
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self.methods = methods[:]
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self.kwargs = kwargs.copy()
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self.kwargs['__multicall__'] = self
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self.results = []
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self.firstresult = firstresult
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def __repr__(self):
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status = "%d results, %d meths" % (len(self.results), len(self.methods))
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return "<MultiCall %s, kwargs=%r>" %(status, self.kwargs)
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def execute(self):
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while self.methods:
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method = self.methods.pop()
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kwargs = self.getkwargs(method)
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res = method(**kwargs)
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if res is not None:
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self.results.append(res)
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if self.firstresult:
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return res
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if not self.firstresult:
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return self.results
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def getkwargs(self, method):
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kwargs = {}
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for argname in varnames(method):
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try:
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kwargs[argname] = self.kwargs[argname]
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except KeyError:
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pass # might be optional param
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return kwargs
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def varnames(rawcode):
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ismethod = hasattr(rawcode, 'im_self')
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rawcode = getattr(rawcode, 'im_func', rawcode)
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rawcode = getattr(rawcode, 'func_code', rawcode)
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try:
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return rawcode.co_varnames[ismethod:]
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except AttributeError:
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return ()
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class Registry:
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"""
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Manage Plugins: register/unregister call calls to plugins.
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"""
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def __init__(self, plugins=None):
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if plugins is None:
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plugins = []
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self._plugins = plugins
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def register(self, plugin):
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assert not isinstance(plugin, str)
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assert not plugin in self._plugins
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self._plugins.append(plugin)
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def unregister(self, plugin):
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self._plugins.remove(plugin)
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def isregistered(self, plugin):
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return plugin in self._plugins
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def __iter__(self):
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return iter(self._plugins)
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def listattr(self, attrname, plugins=None, extra=(), reverse=False):
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l = []
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if plugins is None:
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plugins = self._plugins
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for plugin in list(plugins) + list(extra):
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try:
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l.append(getattr(plugin, attrname))
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except AttributeError:
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continue
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if reverse:
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l.reverse()
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return l
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class HookRelay:
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def __init__(self, hookspecs, registry):
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self._hookspecs = hookspecs
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self._registry = registry
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for name, method in vars(hookspecs).items():
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if name[:1] != "_":
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setattr(self, name, self._makecall(name))
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def _makecall(self, name, extralookup=None):
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hookspecmethod = getattr(self._hookspecs, name)
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firstresult = getattr(hookspecmethod, 'firstresult', False)
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return HookCaller(self, name, firstresult=firstresult,
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extralookup=extralookup)
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def _getmethods(self, name, extralookup=()):
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return self._registry.listattr(name, extra=extralookup)
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def _performcall(self, name, multicall):
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return multicall.execute()
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class HookCaller:
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def __init__(self, hookrelay, name, firstresult, extralookup=()):
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self.hookrelay = hookrelay
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self.name = name
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self.firstresult = firstresult
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self.extralookup = extralookup and [extralookup] or ()
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def __repr__(self):
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return "<HookCaller %r>" %(self.name,)
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def __call__(self, **kwargs):
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methods = self.hookrelay._getmethods(self.name, self.extralookup)
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mc = MultiCall(methods, kwargs, firstresult=self.firstresult)
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return self.hookrelay._performcall(self.name, mc)
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comregistry = Registry([])
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