except ImportError:
import pickle
-from pymin.dispatcher import Handler, handler, HandlerError
+from pymin.dispatcher import Handler, handler, HandlerError, \
+ CommandNotFoundError
-DEBUG = False
-#DEBUG = True
+#DEBUG = False
+DEBUG = True
-__ALL__ = ('ServiceHandler', 'InitdHandler', 'Persistent', 'ConfigWriter',
- 'Error', 'ReturnNot0Error', 'ExecutionError', 'call')
+__ALL__ = ('ServiceHandler', 'InitdHandler', 'SubHandler', 'DictSubHandler',
+ 'ListSubHandler', 'Persistent', 'ConfigWriter', 'Error',
+ 'ReturnNot0Error', 'ExecutionError', 'ItemError',
+ 'ItemAlreadyExistsError', 'ItemNotFoundError', 'call')
class Error(HandlerError):
r"""
message - A descriptive error message.
"""
-
- def __init__(self, message):
- r"Initialize the object. See class documentation for more info."
- self.message = message
-
- def __str__(self):
- return self.message
+ pass
class ReturnNot0Error(Error):
r"""
r"Initialize the object. See class documentation for more info."
self.return_value = return_value
- def __str__(self):
+ def __unicode__(self):
return 'The command returned %d' % self.return_value
class ExecutionError(Error):
self.command = command
self.error = error
- def __str__(self):
+ def __unicode__(self):
command = self.command
if not isinstance(self.command, basestring):
command = ' '.join(command)
class ParameterNotFoundError(ParameterError):
r"""
- ParameterNotFoundError(hostname) -> ParameterNotFoundError instance
+ ParameterNotFoundError(paramname) -> ParameterNotFoundError instance
This exception is raised when trying to operate on a parameter that doesn't
exists.
r"Initialize the object. See class documentation for more info."
self.message = 'Parameter not found: "%s"' % paramname
+class ItemError(Error, KeyError):
+ r"""
+ ItemError(key) -> ItemError instance.
+
+ This is the base exception for all item related errors.
+ """
+
+ def __init__(self, key):
+ r"Initialize the object. See class documentation for more info."
+ self.message = u'Item error: "%s"' % key
+
+class ItemAlreadyExistsError(ItemError):
+ r"""
+ ItemAlreadyExistsError(key) -> ItemAlreadyExistsError instance.
+
+ This exception is raised when trying to add an item that already exists.
+ """
+
+ def __init__(self, key):
+ r"Initialize the object. See class documentation for more info."
+ self.message = u'Item already exists: "%s"' % key
+
+class ItemNotFoundError(ItemError):
+ r"""
+ ItemNotFoundError(key) -> ItemNotFoundError instance
+
+ This exception is raised when trying to operate on an item that doesn't
+ exists.
+ """
+
+ def __init__(self, key):
+ r"Initialize the object. See class documentation for more info."
+ self.message = u'Item not found: "%s"' % key
+
def call(command, stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, close_fds=True, universal_newlines=True,
r"show() -> (key, value) tuples :: List all the parameters."
return self.params.items()
+class SubHandler(Handler):
+ r"""SubHandler(parent) -> SubHandler instance :: Handles subcommands.
+
+ This is a helper class to build sub handlers that needs to reference the
+ parent handler.
+
+ parent - Parent Handler object.
+ """
+
+ def __init__(self, parent):
+ r"Initialize the object, see the class documentation for details."
+ self.parent = parent
+
+class DictSubHandler(SubHandler):
+ r"""DictSubHandler(parent) -> DictSubHandler instance.
+
+ This is a helper class to inherit from to automatically handle subcommands
+ that operates over a dict parent attribute.
+
+ The dict attribute to handle and the class of objects that it contains can
+ be defined by calling the constructor or in a more declarative way as
+ class attributes, like:
+
+ class TestHandler(DictSubHandler):
+ _dict_subhandler_attr = 'some_dict'
+ _dict_subhandler_class = SomeClass
+
+ This way, the parent's some_dict attribute (self.parent.some_dict) will be
+ managed automatically, providing the commands: add, update, delete, get,
+ list and show.
+ """
+
+ def __init__(self, parent, attr=None, key=None, cls=None):
+ r"Initialize the object, see the class documentation for details."
+ self.parent = parent
+ if attr is not None:
+ self._dict_subhandler_attr = attr
+ if key is not None:
+ self._dict_subhandler_key = key
+ if cls is not None:
+ self._dict_subhandler_class = cls
+
+ def _dict(self):
+ return getattr(self.parent, self._dict_subhandler_attr)
+
+ @handler(u'Add a new item')
+ def add(self, key, *args, **kwargs):
+ r"add(key, ...) -> None :: Add an item to the dict."
+ item = self._dict_subhandler_class(key, *args, **kwargs)
+ if key in self._dict():
+ raise ItemAlreadyExistsError(key)
+ self._dict()[key] = item
+
+ @handler(u'Update an item')
+ def update(self, key, *args, **kwargs):
+ r"update(key, ...) -> None :: Update an item of the dict."
+ # TODO make it right with metaclasses, so the method is not created
+ # unless the update() method really exists.
+ if not hasattr(self._dict_subhandler_class, 'update'):
+ raise CommandNotFoundError(('update',))
+ if not key in self._dict():
+ raise ItemNotFoundError(key)
+ self._dict()[key].update(*args, **kwargs)
+
+ @handler(u'Delete an item')
+ def delete(self, key):
+ r"delete(key) -> None :: Delete an item of the dict."
+ if not key in self._dict():
+ raise ItemNotFoundError(key)
+ del self._dict()[key]
+
+ @handler(u'Get information about an item')
+ def get(self, key):
+ r"get(key) -> Host :: List all the information of an item."
+ if not key in self._dict():
+ raise ItemNotFoundError(key)
+ return self._dict()[key]
+
+ @handler(u'List all the items by key')
+ def list(self):
+ r"list() -> tuple :: List all the item keys."
+ return self._dict().keys()
+
+ @handler(u'Get information about all items')
+ def show(self):
+ r"show() -> list of Hosts :: List all the complete items information."
+ return self._dict().values()
+
+
if __name__ == '__main__':
projects / software / pymin.git / blobdiff