completely rewrite file based property handling
Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>
This commit is contained in:
Steven Armstrong
parent
be02dc5ff1
commit
ede35ffd73
1 changed files with 76 additions and 149 deletions
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@ -98,55 +98,6 @@ class FileList(collections.MutableSequence):
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self.__write(lines)
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class FileListProperty(FileList):
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def __init__(self, path):
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"""
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:param path: string or callable
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Usage:
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class Foo(object):
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parameters = DirectoryDictProperty(lambda obj: os.path.join(obj.absolute_path, 'parameter'))
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other_dict = DirectoryDictProperty('/tmp/folder')
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def __init__(self):
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self.absolute_path = '/tmp/foo'
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"""
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self.path = None
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self.__path = path
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def _set_path(self, *args, **kwargs):
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if self.path is None:
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path = self.__path
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if callable(path):
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path = path(*args, **kwargs)
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if not os.path.isabs(path):
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raise AbsolutePathRequiredError(path)
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self.path = path
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# Descriptor Protocol
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def __get__(self, obj, objtype=None):
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if obj is None:
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return self.__class__
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self._set_path(obj)
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return self
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def __set__(self, obj, value):
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self._set_path(obj)
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try:
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os.unlink(self.path)
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except EnvironmentError:
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# ignored
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pass
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for item in value:
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self.append(item)
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def __delete__(self, obj):
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raise AttributeError("can't delete attribute")
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class DirectoryDict(collections.MutableMapping):
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"""A dict that stores it's items as files in a directory.
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@ -178,7 +129,10 @@ class DirectoryDict(collections.MutableMapping):
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fd.write(str(value))
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def __delitem__(self, key):
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try:
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os.remove(os.path.join(self.path, key))
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except EnvironmentError:
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raise KeyError(key)
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def __iter__(self):
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return iter(os.listdir(self.path))
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@ -187,95 +141,98 @@ class DirectoryDict(collections.MutableMapping):
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return len(os.listdir(self.path))
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class DirectoryDictProperty(DirectoryDict):
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class FileBasedProperty(object):
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attribute_class = None
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def __init__(self, path):
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"""
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:param path: string or callable
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Usage:
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Abstract super class. Subclass and set the class member attribute_class accordingly.
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Usage with a sublcass:
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class Foo(object):
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parameters = DirectoryDictProperty(lambda obj: os.path.join(obj.absolute_path, 'parameter'))
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other_dict = DirectoryDictProperty('/tmp/folder')
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# note that the actual DirectoryDict is stored as __parameters on the instance
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parameters = DirectoryDictProperty(lambda instance: os.path.join(instance.absolute_path, 'parameter'))
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# note that the actual DirectoryDict is stored as __other_dict on the instance
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other_dict = DirectoryDictProperty('/tmp/other_dict')
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def __init__(self):
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self.absolute_path = '/tmp/foo'
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"""
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self.path = None
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self.__path = path
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def _set_path(self, *args, **kwargs):
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#print("_set_path: self: %s" % self)
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print("_set_path: args: %s" % args)
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print("_set_path: kwargs: %s" % kwargs)
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print("_set_path: self.path: %s" % self.path)
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if self.path is None:
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path = self.__path
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if callable(path):
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path = path(*args, **kwargs)
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print("_set_path: %s" % path)
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if not os.path.isabs(path):
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raise AbsolutePathRequiredError(path)
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# create directory if it doesn't exist
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print("os.path.isdir(%s): %s" % (path, os.path.isdir(path)))
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if not os.path.isdir(path):
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os.mkdir(path)
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self.path = path
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# Descriptor Protocol
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def __get__(self, obj, objtype=None):
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if obj is None:
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return self.__class__
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self._set_path(obj)
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def _get_path(self, instance):
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path = self.path
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if callable(path):
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path = path(instance)
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return path
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def _get_property_name(self, owner):
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for name, prop in owner.__dict__.items():
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if self == prop:
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return name
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def _get_attribute(self, instance, owner):
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name = self._get_property_name(owner)
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attribute_name = '__%s' % name
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if not hasattr(instance, attribute_name):
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path = self._get_path(instance)
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attribute_instance = self.attribute_class(path)
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setattr(instance, attribute_name, attribute_instance)
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return getattr(instance, attribute_name)
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def __get__(self, instance, owner):
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if instance is None:
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return self
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return self._get_attribute(instance, owner)
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def __set__(self, obj, value):
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self._set_path(obj)
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if value is not None:
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for name in self.keys():
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del self[name]
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self.update(value)
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def __delete__(self, obj):
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def __delete__(self, instance):
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raise AttributeError("can't delete attribute")
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class FileBooleanProperty(object):
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def __init__(self, path):
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class DirectoryDictProperty(FileBasedProperty):
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attribute_class = DirectoryDict
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def __set__(self, instance, value):
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attribute_instance = self._get_attribute(instance, instance.__class__)
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for name in attribute_instance.keys():
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del attribute_instance[name]
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attribute_instance.update(value)
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class FileListProperty(FileBasedProperty):
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attribute_class = FileList
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def __set__(self, instance, value):
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path = self._get_path(instance)
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try:
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os.unlink(path)
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except EnvironmentError:
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# ignored
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pass
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attribute_instance = self._get_attribute(instance, instance.__class__)
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for item in value:
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attribute_instance.append(item)
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class FileBooleanProperty(FileBasedProperty):
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"""A boolean property which uses a file to represent its value.
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File exists -> True
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File does not exists -> False
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"""
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:param path: string or callable
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Usage:
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class Foo(object):
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changed = FileBoolean(lambda obj: os.path.join(obj.absolute_path, 'changed'))
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other_boolean = FileBoolean('/tmp/other_boolean')
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def __init__(self):
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self.absolute_path = '/tmp/foo_boolean'
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"""
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self._path = path
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def _get_path(self, *args, **kwargs):
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path = self._path
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if callable(path):
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return path(*args, **kwargs)
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if not os.path.isabs(path):
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raise AbsolutePathRequiredError(path)
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return path
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# Descriptor Protocol
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def __get__(self, obj, objtype=None):
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if obj is None:
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return self.__class__
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path = self._get_path(obj)
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def __get__(self, instance, owner):
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if instance is None:
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return self
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path = self._get_path(instance)
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return os.path.isfile(path)
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def __set__(self, obj, value):
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path = self._get_path(obj)
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def __set__(self, instance, value):
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path = self._get_path(instance)
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if value:
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open(path, "w").close()
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else:
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@ -285,42 +242,15 @@ class FileBooleanProperty(object):
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# ignore
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pass
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def __delete__(self, obj):
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raise AttributeError("can't delete attribute")
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class FileStringProperty(object):
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class FileStringProperty(FileBasedProperty):
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"""A string property which stores its value in a file.
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"""
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def __init__(self, path):
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"""
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:param path: string or callable
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Usage:
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class Foo(object):
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source = FileStringProperty(lambda obj: os.path.join(obj.absolute_path, 'source'))
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other = FileStringProperty('/tmp/other')
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def __init__(self):
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self.absolute_path = '/tmp/foo_boolean'
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"""
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self._path = path
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def _get_path(self, *args, **kwargs):
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path = self._path
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if callable(path):
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return path(*args, **kwargs)
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if not os.path.isabs(path):
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raise AbsolutePathRequiredError(path)
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return path
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# Descriptor Protocol
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def __get__(self, obj, objtype=None):
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if obj is None:
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return self.__class__
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path = self._get_path(obj)
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def __get__(self, instance, owner):
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if instance is None:
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return self
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path = self._get_path(instance)
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value = ""
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try:
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with open(path, "r") as fd:
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@ -329,16 +259,13 @@ class FileStringProperty(object):
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pass
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return value
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def __set__(self, obj, value):
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path = self._get_path(obj)
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def __set__(self, instance, value):
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path = self._get_path(instance)
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if value:
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with open(path, "w") as fd:
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fd.write(str(value))
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else:
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try:
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os.unlink(path)
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os.remove(path)
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except EnvironmentError:
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pass
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def __delete__(self, obj):
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raise AttributeError("Can't delete attribute. Set it's value to an empty string to remove the underlying file.")
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