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|
#!/usr/bin/env python
from base import *
from objecttree import ObjectTree
from memoryfs import MemoryFS
class DirMount(object):
def __init__(self, path, fs):
self.path = path
self.fs = fs
def __str__(self):
return "Mount point: %s"%self.path
class FileMount(object):
def __init__(self, path, open_callable, info_callable=None):
self.open_callable = open_callable
def no_info_callable(path):
return {}
self.info_callable = info_callable or no_info_callable
class MountFS(FS):
"""A filesystem that delegates to other filesystems."""
DirMount = DirMount
FileMount = FileMount
def __init__(self, thread_synchronize=True):
FS.__init__(self, thread_synchronize=thread_synchronize)
self.mount_tree = ObjectTree()
def __str__(self):
return "<MountFS>"
__repr__ = __str__
def __unicode__(self):
return unicode(self.__str__())
def _delegate(self, path):
path = normpath(path)
head_path, object, tail_path = self.mount_tree.partialget(path)
if type(object) is MountFS.DirMount:
dirmount = object
return dirmount.fs, head_path, tail_path
if object is None:
return None, None, None
return self, head_path, tail_path
def desc(self, path):
self._lock.acquire()
try:
fs, mount_path, delegate_path = self._delegate(path)
if fs is self:
if fs.isdir(path):
return "Mount dir"
else:
return "Mounted file"
return "Mounted dir, maps to path %s on %s" % (delegate_path, str(fs))
finally:
self._lock.release()
def isdir(self, path):
self._lock.acquire()
try:
fs, mount_path, delegate_path = self._delegate(path)
if fs is None:
raise ResourceNotFoundError(path)
if fs is self:
object = self.mount_tree.get(path, None)
return isinstance(object, dict)
else:
return fs.isdir(delegate_path)
finally:
self._lock.release()
def isfile(self, path):
self._lock.acquire()
try:
fs, mount_path, delegate_path = self._delegate(path)
if fs is None:
return ResourceNotFoundError(path)
if fs is self:
object = self.mount_tree.get(path, None)
return type(object) is MountFS.FileMount
else:
return fs.isfile(delegate_path)
finally:
self._lock.release()
def listdir(self, path="/", wildcard=None, full=False, absolute=False, dirs_only=False, files_only=False):
self._lock.acquire()
try:
path = normpath(path)
fs, mount_path, delegate_path = self._delegate(path)
if fs is None:
raise ResourceNotFoundError(path)
if fs is self:
if files_only:
return []
paths = self.mount_tree[path].keys()
return self._listdir_helper(path,
paths,
wildcard,
full,
absolute,
dirs_only,
files_only)
else:
paths = fs.listdir(delegate_path,
wildcard=wildcard,
full=False,
absolute=False,
dirs_only=dirs_only,
files_only=files_only)
if full or absolute:
if full:
path = abspath(normpath(path))
else:
path = relpath(normpath(path))
paths = [pathjoin(path, p) for p in paths]
return paths
finally:
self._lock.release()
def makedir(self, path, recursive=False, allow_recreate=False):
path = normpath(path)
self._lock.acquire()
try:
fs, mount_path, delegate_path = self._delegate(path)
if fs is self:
raise UnsupportedError("make directory", msg="Can only makedir for mounted paths" )
return fs.makedir(delegate_path, recursive=recursive, allow_recreate=allow_recreate)
finally:
self._lock.release()
def open(self, path, mode="r", **kwargs):
self._lock.acquire()
try:
path = normpath(path)
object = self.mount_tree.get(path, None)
if type(object) is MountFS.FileMount:
callable = object.open_callable
return callable(path, mode, **kwargs)
fs, mount_path, delegate_path = self._delegate(path)
if fs is None:
raise ResourceNotFoundError(path)
return fs.open(delegate_path, mode, **kwargs)
finally:
self._lock.release()
def exists(self, path):
self._lock.acquire()
try:
path = normpath(path)
fs, mount_path, delegate_path = self._delegate(path)
if fs is None:
return False
if fs is self:
return path in self.mount_tree
return fs.exists(delegate_path)
finally:
self._lock.release()
def remove(self, path):
self._lock.acquire()
try:
path = normpath(path)
fs, mount_path, delegate_path = self._delegate(path)
if fs is None:
raise ResourceNotFoundError(path)
if fs is self:
raise UnsupportedError("remove file", msg="Can only remove paths within a mounted dir")
return fs.remove(delegate_path)
finally:
self._lock.release()
def removedir(self, path, recursive=False, force=False):
self._lock.acquire()
try:
path = normpath(path)
fs, mount_path, delegate_path = self._delegate(path)
if fs is None or fs is self:
raise ResourceInvalidError(path, msg="Can not removedir for an un-mounted path")
if not force and not fs.isdirempty(delegate_path):
raise DirectoryNotEmptyError("Directory is not empty: %(path)s")
return fs.removedir(delegate_path, recursive, force)
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:
fs1, mount_path1, delegate_path1 = self._delegate(src)
fs2, mount_path2, delegate_path2 = self._delegate(dst)
if fs1 is not fs2:
raise OperationFailedError("rename resource", path=src)
if fs1 is not self:
return fs1.rename(delegate_path1, delegate_path2)
path_src = normpath(src)
path_dst = normpath(dst)
object = self.mount_tree.get(path_src, None)
object2 = self.mount_tree.get(path_dst, None)
if object1 is None:
raise ResourceNotFoundError(src)
# TODO!
raise UnsupportedError("rename resource", path=src)
finally:
self._lock.release()
def mountdir(self, path, fs):
"""Mounts a directory on a given path.
path -- A path within the MountFS
fs -- A filesystem object to mount
"""
self._lock.acquire()
try:
path = normpath(path)
self.mount_tree[path] = MountFS.DirMount(path, fs)
finally:
self._lock.release()
mount = mountdir
def mountfile(self, path, open_callable=None, info_callable=None):
self._lock.acquire()
try:
path = normpath(path)
self.mount_tree[path] = MountFS.FileMount(path, callable, info_callable)
finally:
self._lock.release()
def getinfo(self, path):
self._lock.acquire()
try:
path = normpath(path)
fs, mount_path, delegate_path = self._delegate(path)
if fs is None:
raise ResourceNotFoundError(path)
if fs is self:
if self.isfile(path):
return self.mount_tree[path].info_callable(path)
return {}
return fs.getinfo(delegate_path)
finally:
self._lock.release()
def getsize(self, path):
self._lock.acquire()
try:
path = normpath(path)
fs, mount_path, delegate_path = self._delegate(path)
if fs is None:
raise ResourceNotFoundError(path)
if fs is self:
object = self.mount_tree.get(path, None)
if object is None or isinstance(object, dict):
raise ResourceNotFoundError(path)
size = self.mount_tree[path].info_callable(path).get("size", None)
return size
return fs.getinfo(delegate_path).get("size", None)
except:
self._lock.release()
|
