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