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� ��Wc @ sm d Z d d l Z d d l Z d d l m Z e j e � Z d e f d � � YZ d e f d � � YZ d S( s ExtensionManager i����Ni ( t NoMatchest Extensionc B s& e Z d Z d � Z e d � � Z RS( s� Book-keeping object for tracking extensions. The arguments passed to the constructor are saved as attributes of the instance using the same names, and can be accessed by the callables passed to :meth:`map` or when iterating over an :class:`ExtensionManager` directly. :param name: The entry point name. :type name: str :param entry_point: The EntryPoint instance returned by :mod:`pkg_resources`. :type entry_point: EntryPoint :param plugin: The value returned by entry_point.load() :param obj: The object returned by ``plugin(*args, **kwds)`` if the manager invoked the extension on load. c C s( | | _ | | _ | | _ | | _ d S( N( t namet entry_pointt plugint obj( t selfR R R R ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt __init__ s c C s d | j j | j j d f S( s� The module and attribute referenced by this extension's entry_point. :return: A string representation of the target of the entry point in 'dotted.module:object' format. s %s:%si ( R t module_namet attrs( R ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt entry_point_target& s ( t __name__t __module__t __doc__R t propertyR ( ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyR s t ExtensionManagerc B s� e Z d Z e d i e d e d � Z e d e d e d � � Z e d d � Z d � Z i Z d � Z d � Z d � Z d � Z d � Z e d � � Z d � Z d � Z d � Z d � Z d � Z RS( sW Base class for all of the other managers. :param namespace: The namespace for the entry points. :type namespace: str :param invoke_on_load: Boolean controlling whether to invoke the object returned by the entry point after the driver is loaded. :type invoke_on_load: bool :param invoke_args: Positional arguments to pass when invoking the object returned by the entry point. Only used if invoke_on_load is True. :type invoke_args: tuple :param invoke_kwds: Named arguments to pass when invoking the object returned by the entry point. Only used if invoke_on_load is True. :type invoke_kwds: dict :param propagate_map_exceptions: Boolean controlling whether exceptions are propagated up through the map call or whether they are logged and then ignored :type propagate_map_exceptions: bool :param on_load_failure_callback: Callback function that will be called when a entrypoint can not be loaded. The arguments that will be provided when this is called (when an entrypoint fails to load) are (manager, entrypoint, exception) :type on_load_failure_callback: function :param verify_requirements: Use setuptools to enforce the dependencies of the plugin(s) being loaded. Defaults to False. :type verify_requirements: bool c C sB | j | d | d | �| j | | | | � } | j | � d S( Nt propagate_map_exceptionst on_load_failure_callback( t _init_attributest _load_pluginst _init_plugins( R t namespacet invoke_on_loadt invoke_argst invoke_kwdsR R t verify_requirementst extensions( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyR O s t TESTINGc C s9 | j | � } | j | d | d | �| j | � | S( s Construct a test ExtensionManager Test instances are passed a list of extensions to work from rather than loading them from entry points. :param extensions: Pre-configured Extension instances to use :type extensions: list of :class:`~stevedore.extension.Extension` :param namespace: The namespace for the manager; used only for identification since the extensions are passed in. :type namespace: str :param propagate_map_exceptions: When calling map, controls whether exceptions are propagated up through the map call or whether they are logged and then ignored :type propagate_map_exceptions: bool :param on_load_failure_callback: Callback function that will be called when a entrypoint can not be loaded. The arguments that will be provided when this is called (when an entrypoint fails to load) are (manager, entrypoint, exception) :type on_load_failure_callback: function :param verify_requirements: Use setuptools to enforce the dependencies of the plugin(s) being loaded. Defaults to False. :type verify_requirements: bool :return: The manager instance, initialized for testing R R ( t __new__R R ( t clsR R R R R t o( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt make_test_instance` s c C s | | _ | | _ | | _ d S( N( R R t _on_load_failure_callback( R R R R ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyR � s c C s | | _ d | _ d S( N( R t Nonet _extensions_by_name( R R ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyR � s c C s? | | j k r4 t t j | � � } | | j | <n | j | S( N( t ENTRY_POINT_CACHEt listt pkg_resourcest iter_entry_points( R R t eps( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt _find_entry_points� s c C s� g } x� | j | j � D]� } t j d | � y5 | j | | | | | � } | rc | j | � n Wq t t f k r� � q t k r� } | j d k r� | j | | | � q� t j d | j | d t j t j � �q Xq W| S( Ns found extension %rs Could not load %r: %st exc_info( R( R t LOGt debugt _load_one_plugint appendt KeyboardInterruptt AssertionErrort ExceptionR R! t errorR t isEnabledFort loggingt DEBUG( R R R R R R t ept extt err( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyR � s& c C s� t | d � r@ t | d � r@ | r1 | j � n | j � } n | j d | � } | rj | | | � } n d } t | j | | | � S( Nt resolvet require( t hasattrR9 R8 t loadR! R R ( R R5 R R R R R R ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyR, � s c C s g | j D] } | j ^ q S( s. Returns the names of the discovered extensions( R R ( R t e( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt names� s c O sY | j s t d | j � � n g } x- | j D]" } | j | j | | | | � q/ W| S( s� Iterate over the extensions invoking func() for each. The signature for func() should be:: def func(ext, *args, **kwds): pass The first argument to func(), 'ext', is the :class:`~stevedore.extension.Extension` instance. Exceptions raised from within func() are propagated up and processing stopped if self.propagate_map_exceptions is True, otherwise they are logged and ignored. :param func: Callable to invoke for each extension. :param args: Variable arguments to pass to func() :param kwds: Keyword arguments to pass to func() :returns: List of values returned from func() s No %s extensions found( R R R t _invoke_one_pluginR- ( R t funct argst kwdst responseR< ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt map� s c O s t | j | � | | � S( N( t getattrR ( t extensiont method_nameR@ RA ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt _call_extension_method� s c O s | j | j | | | � S( s� Iterate over the extensions invoking a method by name. This is equivalent of using :meth:`map` with func set to `lambda x: x.obj.method_name()` while being more convenient. Exceptions raised from within the called method are propagated up and processing stopped if self.propagate_map_exceptions is True, otherwise they are logged and ignored. .. versionadded:: 0.12 :param method_name: The extension method name to call for each extension. :param args: Variable arguments to pass to method :param kwds: Keyword arguments to pass to method :returns: List of values returned from methods ( RC RG ( R RF R@ RA ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt map_method� s c C sf y | | | | | � � WnE t k ra } | j r; � qb t j d | j | � t j | � n Xd S( Ns error calling %r: %s( R0 R R* R1 R t exception( R t response_callbackR? R< R@ RA R7 ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyR> s c C s t | j � S( s� Produce iterator for the manager. Iterating over an ExtensionManager produces the :class:`Extension` instances in the order they would be invoked. ( t iterR ( R ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt __iter__ s c C sM | j d k rB i } x | j D] } | | | j <q W| | _ n | j | S( s� Return the named extension. Accessing an ExtensionManager as a dictionary (``em['name']``) produces the :class:`Extension` instance with the specified name. N( R" R! R R ( R R t dR< ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt __getitem__ s c s t � f d � | j D� � S( s> Return true if name is in list of enabled extensions. c 3 s | ] } | j � k Vq d S( N( R ( t .0RE ( R ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pys <genexpr>( s ( t anyR ( R R ( ( R s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt __contains__% s ( N( R R R t FalseR! R t classmethodR R R R# R( R R, R= RC t staticmethodRG RH R> RL RN RQ ( ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyR 1 s6 # ( R R% R3 RI R t getLoggerR R* t objectR R ( ( ( s6 /tmp/pip-build-T5Mfvc/stevedore/stevedore/extension.pyt <module> s $
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