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#!/usr/in/env python
from fs.base import FS, FSError
from fs.path import *
class MultiFS(FS):
"""A MultiFS is a filesystem that delegates to a sequence of other filesystems.
Operations on the MultiFS will try each 'child' filesystem in order, until it
succeeds. In effect, creating a filesystem that combines the files and dirs of
its children.
"""
def __init__(self):
FS.__init__(self, thread_synchronize=True)
self.fs_sequence = []
self.fs_lookup = {}
def __str__(self):
self._lock.acquire()
try:
return "<MultiFS: %s>" % ", ".join(str(fs) for fs in self.fs_sequence)
finally:
self._lock.release()
__repr__ = __str__
def __unicode__(self):
return unicode(self.__str__())
def addfs(self, name, fs):
"""Adds a filesystem to the MultiFS.
name -- A unique name to refer to the filesystem being added
fs -- The filesystem to add
"""
self._lock.acquire()
try:
if name in self.fs_lookup:
raise ValueError("Name already exists.")
self.fs_sequence.append(fs)
self.fs_lookup[name] = fs
finally:
self._lock.release()
def removefs(self, name):
"""Removes a filesystem from the sequence.
name -- The name of the filesystem, as used in addfs
"""
self._lock.acquire()
try:
if name not in self.fs_lookup:
raise ValueError("No filesystem called '%s'"%name)
fs = self.fs_lookup[name]
self.fs_sequence.remove(fs)
del self.fs_lookup[name]
finally:
self._lock.release()
def __getitem__(self, name):
self._lock.acquire()
try:
return self.fs_lookup[name]
finally:
self._lock.release()
def __iter__(self):
self._lock.acquire()
try:
return iter(self.fs_sequence[:])
finally:
self._lock.release()
def _delegate_search(self, path):
for fs in self:
if fs.exists(path):
return fs
return None
def which(self, path):
"""Retrieves the filesystem that a given path would delegate to.
Returns a tuple of the filesystem's name and the filesystem object itself.
path -- A path in MultiFS
"""
self._lock.acquire()
try:
for fs in self:
if fs.exists(path):
for fs_name, fs_object in self.fs_lookup.iteritems():
if fs is fs_object:
return fs_name, fs
raise ResourceNotFoundError(path, msg="Path does not map to any filesystem: %(path)s")
finally:
self._lock.release()
def getsyspath(self, path, allow_none=False):
self._lock.acquire()
try:
fs = self._delegate_search(path)
if fs is not None:
return fs.getsyspath(path, allow_none=allow_none)
raise ResourceNotFoundError(path)
finally:
self._lock.release()
def desc(self, path):
self._lock.acquire()
try:
if not self.exists(path):
raise ResourceNotFoundError(path)
name, fs = self.which(path)
if name is None:
return ""
return "%s, on %s (%s)" % (fs.desc(path), name, fs)
finally:
self._lock.release()
def open(self, path, mode="r",**kwargs):
self._lock.acquire()
try:
for fs in self:
if fs.exists(path):
fs_file = fs.open(path, mode, **kwargs)
return fs_file
raise ResourceNotFoundError(path)
finally:
self._lock.release()
def exists(self, path):
self._lock.acquire()
try:
return self._delegate_search(path) is not None
finally:
self._lock.release()
def isdir(self, path):
self._lock.acquire()
try:
fs = self._delegate_search(path)
if fs is not None:
return fs.isdir(path)
return False
finally:
self._lock.release()
def isfile(self, path):
self._lock.acquire()
try:
fs = self._delegate_search(path)
if fs is not None:
return fs.isfile(path)
return False
finally:
self._lock.release()
def listdir(self, path="./", *args, **kwargs):
self._lock.acquire()
try:
paths = []
for fs in self:
try:
paths += fs.listdir(path, *args, **kwargs)
except FSError, e:
pass
return list(set(paths))
finally:
self._lock.release()
def remove(self, path):
self._lock.acquire()
try:
for fs in self:
if fs.exists(path):
fs.remove(path)
return
raise ResourceNotFoundError(path)
finally:
self._lock.release()
def removedir(self, path, recursive=False):
self._lock.acquire()
try:
for fs in self:
if fs.isdir(path):
fs.removedir(path, recursive)
return
raise ResourceNotFoundError(path)
finally:
self._lock.release()
def rename(self, src, dst):
if not issamedir(src, dst):
raise ValueError("Destination path must the same directory (use the move method for moving to a different directory)")
self._lock.acquire()
try:
for fs in self:
if fs.exists(src):
fs.rename(src, dst)
return
raise ResourceNotFoundError(path)
finally:
self._lock.release()
def getinfo(self, path):
self._lock.acquire()
try:
for fs in self:
if fs.exists(path):
return fs.getinfo(path)
raise ResourceNotFoundError(path)
finally:
self._lock.release()
|
