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|
#!/usr/bin/env python
"""
fs.memoryfs
===========
A Filesystem that exists in memory only. Which makes them extremely fast, but non-permanent.
If you open a file from a `memoryfs` you will get back a StringIO object from the standard library.
"""
import datetime
import stat
from fs.path import iteratepath, pathsplit, normpath
from fs.base import *
from fs.errors import *
from fs import _thread_synchronize_default
from fs.filelike import StringIO
from os import SEEK_END
import threading
import six
from six import b
def _check_mode(mode, mode_chars):
for c in mode_chars:
if c not in mode:
return False
return True
class MemoryFile(object):
def seek_and_lock(f):
def deco(self, *args, **kwargs):
try:
self._lock.acquire()
self.mem_file.seek(self.pos)
ret = f(self, *args, **kwargs)
self.pos = self.mem_file.tell()
return ret
finally:
self._lock.release()
return deco
def __init__(self, path, memory_fs, mem_file, mode, lock):
self.closed = False
self.path = path
self.memory_fs = memory_fs
self.mem_file = mem_file
self.mode = mode
self._lock = lock
self.pos = 0
if _check_mode(mode, 'a'):
lock.acquire()
try:
self.mem_file.seek(0, SEEK_END)
self.pos = self.mem_file.tell()
finally:
lock.release()
elif _check_mode(mode, 'w'):
lock.acquire()
try:
self.mem_file.seek(0)
self.mem_file.truncate()
finally:
lock.release()
assert self.mem_file is not None, "self.mem_file should have a value"
def __str__(self):
return "<MemoryFile in %s %s>" % (self.memory_fs, self.path)
def __repr__(self):
return u"<MemoryFile in %s %s>" % (self.memory_fs, self.path)
def __unicode__(self):
return u"<MemoryFile in %s %s>" % (self.memory_fs, self.path)
def __del__(self):
if not self.closed:
self.close()
def flush(self):
pass
def __iter__(self):
if 'r' not in self.mode and '+' not in self.mode:
raise IOError("File not open for reading")
self.mem_file.seek(self.pos)
for line in self.mem_file:
yield line
@seek_and_lock
def next(self):
if 'r' not in self.mode and '+' not in self.mode:
raise IOError("File not open for reading")
return self.mem_file.next()
@seek_and_lock
def readline(self, *args, **kwargs):
if 'r' not in self.mode and '+' not in self.mode:
raise IOError("File not open for reading")
return self.mem_file.readline(*args, **kwargs)
def close(self):
do_close = False
self._lock.acquire()
try:
do_close = not self.closed and self.mem_file is not None
if do_close:
self.closed = True
finally:
self._lock.release()
if do_close:
self.memory_fs._on_close_memory_file(self, self.path)
@seek_and_lock
def read(self, size=None):
if 'r' not in self.mode and '+' not in self.mode:
raise IOError("File not open for reading")
if size is None:
size = -1
return self.mem_file.read(size)
@seek_and_lock
def seek(self, *args, **kwargs):
return self.mem_file.seek(*args, **kwargs)
@seek_and_lock
def tell(self):
return self.pos
@seek_and_lock
def truncate(self, *args, **kwargs):
if 'r' in self.mode and '+' not in self.mode:
raise IOError("File not open for writing")
return self.mem_file.truncate(*args, **kwargs)
#@seek_and_lock
def write(self, data):
if 'r' in self.mode and '+' not in self.mode:
raise IOError("File not open for writing")
self.memory_fs._on_modify_memory_file(self.path)
self._lock.acquire()
try:
self.mem_file.seek(self.pos)
self.mem_file.write(data)
self.pos = self.mem_file.tell()
finally:
self._lock.release()
@seek_and_lock
def writelines(self, *args, **kwargs):
return self.mem_file.writelines(*args, **kwargs)
def __enter__(self):
return self
def __exit__(self,exc_type,exc_value,traceback):
self.close()
return False
class DirEntry(object):
def sync(f):
def deco(self, *args, **kwargs):
if self.lock is not None:
try:
self.lock.acquire()
return f(self, *args, **kwargs)
finally:
self.lock.release()
else:
return f(self, *args, **kwargs)
return deco
def __init__(self, type, name, contents=None):
assert type in ("dir", "file"), "Type must be dir or file!"
self.type = type
self.name = name
if contents is None and type == "dir":
contents = {}
self.open_files = []
self.contents = contents
self.mem_file = None
self.created_time = datetime.datetime.now()
self.modified_time = self.created_time
self.accessed_time = self.created_time
self.xattrs = {}
self.lock = None
if self.type == 'file':
self.mem_file = StringIO()
self.lock = threading.RLock()
def get_value(self):
self.lock.acquire()
try:
return self.mem_file.getvalue()
finally:
self.lock.release()
data = property(get_value)
def desc_contents(self):
if self.isfile():
return "<file %s>" % self.name
elif self.isdir():
return "<dir %s>" % "".join( "%s: %s" % (k, v.desc_contents()) for k, v in self.contents.iteritems())
def isdir(self):
return self.type == "dir"
def isfile(self):
return self.type == "file"
def __str__(self):
return "%s: %s" % (self.name, self.desc_contents())
@sync
def __getstate__(self):
state = self.__dict__.copy()
state.pop('lock')
if self.mem_file is not None:
state['mem_file'] = self.data
return state
def __setstate__(self, state):
self.__dict__.update(state)
if self.type == 'file':
self.lock = threading.RLock()
else:
self.lock = None
if self.mem_file is not None:
data = self.mem_file
self.mem_file = StringIO()
self.mem_file.write(data)
class MemoryFS(FS):
"""An in-memory filesystem.
"""
_meta = {'thread_safe' : True,
'network' : False,
'virtual': False,
'read_only' : False,
'unicode_paths' : True,
'case_insensitive_paths' : False,
'atomic.move' : False,
'atomic.copy' : False,
'atomic.makedir' : True,
'atomic.rename' : True,
'atomic.setcontents' : False,
}
def _make_dir_entry(self, *args, **kwargs):
return self.dir_entry_factory(*args, **kwargs)
def __init__(self, file_factory=None):
super(MemoryFS, self).__init__(thread_synchronize=_thread_synchronize_default)
self.dir_entry_factory = DirEntry
self.file_factory = file_factory or MemoryFile
if not callable(self.file_factory):
raise ValueError("file_factory should be callable")
self.root = self._make_dir_entry('dir', 'root')
def __str__(self):
return "<MemoryFS>"
def __repr__(self):
return "MemoryFS()"
def __unicode__(self):
return "<MemoryFS>"
@synchronize
def _get_dir_entry(self, dirpath):
dirpath = normpath(dirpath)
current_dir = self.root
for path_component in iteratepath(dirpath):
if current_dir.contents is None:
return None
dir_entry = current_dir.contents.get(path_component, None)
if dir_entry is None:
return None
current_dir = dir_entry
return current_dir
@synchronize
def _dir_entry(self, path):
dir_entry = self._get_dir_entry(path)
if dir_entry is None:
raise ResourceNotFoundError(path)
return dir_entry
@synchronize
def desc(self, path):
if self.isdir(path):
return "Memory dir"
elif self.isfile(path):
return "Memory file object"
else:
return "No description available"
@synchronize
def isdir(self, path):
path = normpath(path)
if path in ('', '/'):
return True
dir_item = self._get_dir_entry(path)
if dir_item is None:
return False
return dir_item.isdir()
@synchronize
def isfile(self, path):
path = normpath(path)
if path in ('', '/'):
return False
dir_item = self._get_dir_entry(path)
if dir_item is None:
return False
return dir_item.isfile()
@synchronize
def exists(self, path):
path = normpath(path)
if path in ('', '/'):
return True
return self._get_dir_entry(path) is not None
@synchronize
def makedir(self, dirname, recursive=False, allow_recreate=False):
if not dirname and not allow_recreate:
raise PathError(dirname)
fullpath = normpath(dirname)
if fullpath in ('', '/'):
if allow_recreate:
return
raise DestinationExistsError(dirname)
dirpath, dirname = pathsplit(dirname)
if recursive:
parent_dir = self._get_dir_entry(dirpath)
if parent_dir is not None:
if parent_dir.isfile():
raise ResourceInvalidError(dirname, msg="Can not create a directory, because path references a file: %(path)s")
else:
if not allow_recreate:
if dirname in parent_dir.contents:
raise DestinationExistsError(dirname, msg="Can not create a directory that already exists (try allow_recreate=True): %(path)s")
current_dir = self.root
for path_component in iteratepath(dirpath)[:-1]:
dir_item = current_dir.contents.get(path_component, None)
if dir_item is None:
break
if not dir_item.isdir():
raise ResourceInvalidError(dirname, msg="Can not create a directory, because path references a file: %(path)s")
current_dir = dir_item
current_dir = self.root
for path_component in iteratepath(dirpath):
dir_item = current_dir.contents.get(path_component, None)
if dir_item is None:
new_dir = self._make_dir_entry("dir", path_component)
current_dir.contents[path_component] = new_dir
current_dir = new_dir
else:
current_dir = dir_item
parent_dir = current_dir
else:
parent_dir = self._get_dir_entry(dirpath)
if parent_dir is None:
raise ParentDirectoryMissingError(dirname, msg="Could not make dir, as parent dir does not exist: %(path)s")
dir_item = parent_dir.contents.get(dirname, None)
if dir_item is not None:
if dir_item.isdir():
if not allow_recreate:
raise DestinationExistsError(dirname)
else:
raise ResourceInvalidError(dirname, msg="Can not create a directory, because path references a file: %(path)s")
if dir_item is None:
parent_dir.contents[dirname] = self._make_dir_entry("dir", dirname)
#@synchronize
#def _orphan_files(self, file_dir_entry):
# for f in file_dir_entry.open_files[:]:
# f.close()
@synchronize
def open(self, path, mode="r", **kwargs):
path = normpath(path)
filepath, filename = pathsplit(path)
parent_dir_entry = self._get_dir_entry(filepath)
if parent_dir_entry is None or not parent_dir_entry.isdir():
raise ResourceNotFoundError(path)
if 'r' in mode or 'a' in mode:
if filename not in parent_dir_entry.contents:
raise ResourceNotFoundError(path)
file_dir_entry = parent_dir_entry.contents[filename]
if file_dir_entry.isdir():
raise ResourceInvalidError(path)
file_dir_entry.accessed_time = datetime.datetime.now()
mem_file = self.file_factory(path, self, file_dir_entry.mem_file, mode, file_dir_entry.lock)
file_dir_entry.open_files.append(mem_file)
return mem_file
elif 'w' in mode:
if filename not in parent_dir_entry.contents:
file_dir_entry = self._make_dir_entry("file", filename)
parent_dir_entry.contents[filename] = file_dir_entry
else:
file_dir_entry = parent_dir_entry.contents[filename]
file_dir_entry.accessed_time = datetime.datetime.now()
mem_file = self.file_factory(path, self, file_dir_entry.mem_file, mode, file_dir_entry.lock)
file_dir_entry.open_files.append(mem_file)
return mem_file
if parent_dir_entry is None:
raise ResourceNotFoundError(path)
@synchronize
def remove(self, path):
dir_entry = self._get_dir_entry(path)
if dir_entry is None:
raise ResourceNotFoundError(path)
if dir_entry.isdir():
raise ResourceInvalidError(path,msg="That's a directory, not a file: %(path)s")
pathname, dirname = pathsplit(path)
parent_dir = self._get_dir_entry(pathname)
del parent_dir.contents[dirname]
@synchronize
def removedir(self, path, recursive=False, force=False):
path = normpath(path)
if path in ('', '/'):
raise RemoveRootError(path)
dir_entry = self._get_dir_entry(path)
if dir_entry is None:
raise ResourceNotFoundError(path)
if not dir_entry.isdir():
raise ResourceInvalidError(path, msg="Can't remove resource, its not a directory: %(path)s" )
if dir_entry.contents and not force:
raise DirectoryNotEmptyError(path)
if recursive:
rpathname = path
while rpathname:
rpathname, dirname = pathsplit(rpathname)
parent_dir = self._get_dir_entry(rpathname)
if not dirname:
raise RemoveRootError(path)
del parent_dir.contents[dirname]
# stop recursing if the directory has other contents
if parent_dir.contents:
break
else:
pathname, dirname = pathsplit(path)
parent_dir = self._get_dir_entry(pathname)
if not dirname:
raise RemoveRootError(path)
del parent_dir.contents[dirname]
@synchronize
def rename(self, src, dst):
src = normpath(src)
dst = normpath(dst)
src_dir, src_name = pathsplit(src)
src_entry = self._get_dir_entry(src)
if src_entry is None:
raise ResourceNotFoundError(src)
open_files = src_entry.open_files[:]
for f in open_files:
f.flush()
f.path = dst
dst_dir,dst_name = pathsplit(dst)
dst_entry = self._get_dir_entry(dst)
if dst_entry is not None:
raise DestinationExistsError(dst)
src_dir_entry = self._get_dir_entry(src_dir)
src_xattrs = src_dir_entry.xattrs.copy()
dst_dir_entry = self._get_dir_entry(dst_dir)
if dst_dir_entry is None:
raise ParentDirectoryMissingError(dst)
dst_dir_entry.contents[dst_name] = src_dir_entry.contents[src_name]
dst_dir_entry.contents[dst_name].name = dst_name
dst_dir_entry.xattrs.update(src_xattrs)
del src_dir_entry.contents[src_name]
@synchronize
def settimes(self, path, accessed_time=None, modified_time=None):
now = datetime.datetime.now()
if accessed_time is None:
accessed_time = now
if modified_time is None:
modified_time = now
dir_entry = self._get_dir_entry(path)
if dir_entry is not None:
dir_entry.accessed_time = accessed_time
dir_entry.modified_time = modified_time
return True
return False
@synchronize
def _on_close_memory_file(self, open_file, path):
dir_entry = self._get_dir_entry(path)
if dir_entry is not None:
dir_entry.open_files.remove(open_file)
@synchronize
def _on_modify_memory_file(self, path):
dir_entry = self._get_dir_entry(path)
if dir_entry is not None:
dir_entry.modified_time = datetime.datetime.now()
@synchronize
def listdir(self, path="/", wildcard=None, full=False, absolute=False, dirs_only=False, files_only=False):
dir_entry = self._get_dir_entry(path)
if dir_entry is None:
raise ResourceNotFoundError(path)
if dir_entry.isfile():
raise ResourceInvalidError(path, msg="not a directory: %(path)s")
paths = dir_entry.contents.keys()
for (i,p) in enumerate(paths):
if not isinstance(p,unicode):
paths[i] = unicode(p)
return self._listdir_helper(path, paths, wildcard, full, absolute, dirs_only, files_only)
@synchronize
def getinfo(self, path):
dir_entry = self._get_dir_entry(path)
if dir_entry is None:
raise ResourceNotFoundError(path)
info = {}
info['created_time'] = dir_entry.created_time
info['modified_time'] = dir_entry.modified_time
info['accessed_time'] = dir_entry.accessed_time
if dir_entry.isdir():
info['st_mode'] = 0755 | stat.S_IFDIR
else:
info['size'] = len(dir_entry.data or b(''))
info['st_mode'] = 0666 | stat.S_IFREG
return info
@synchronize
def copydir(self, src, dst, overwrite=False, ignore_errors=False, chunk_size=1024*64):
src_dir_entry = self._get_dir_entry(src)
if src_dir_entry is None:
raise ResourceNotFoundError(src)
src_xattrs = src_dir_entry.xattrs.copy()
super(MemoryFS, self).copydir(src, dst, overwrite, ignore_errors=ignore_errors, chunk_size=chunk_size)
dst_dir_entry = self._get_dir_entry(dst)
if dst_dir_entry is not None:
dst_dir_entry.xattrs.update(src_xattrs)
@synchronize
def movedir(self, src, dst, overwrite=False, ignore_errors=False, chunk_size=1024*64):
src_dir_entry = self._get_dir_entry(src)
if src_dir_entry is None:
raise ResourceNotFoundError(src)
src_xattrs = src_dir_entry.xattrs.copy()
super(MemoryFS, self).movedir(src, dst, overwrite, ignore_errors=ignore_errors, chunk_size=chunk_size)
dst_dir_entry = self._get_dir_entry(dst)
if dst_dir_entry is not None:
dst_dir_entry.xattrs.update(src_xattrs)
@synchronize
def copy(self, src, dst, overwrite=False, chunk_size=1024*64):
src_dir_entry = self._get_dir_entry(src)
if src_dir_entry is None:
raise ResourceNotFoundError(src)
src_xattrs = src_dir_entry.xattrs.copy()
super(MemoryFS, self).copy(src, dst, overwrite, chunk_size)
dst_dir_entry = self._get_dir_entry(dst)
if dst_dir_entry is not None:
dst_dir_entry.xattrs.update(src_xattrs)
@synchronize
def move(self, src, dst, overwrite=False, chunk_size=1024*64):
src_dir_entry = self._get_dir_entry(src)
if src_dir_entry is None:
raise ResourceNotFoundError(src)
src_xattrs = src_dir_entry.xattrs.copy()
super(MemoryFS, self).move(src, dst, overwrite, chunk_size)
dst_dir_entry = self._get_dir_entry(dst)
if dst_dir_entry is not None:
dst_dir_entry.xattrs.update(src_xattrs)
@synchronize
def getcontents(self, path, mode="rb"):
dir_entry = self._get_dir_entry(path)
if dir_entry is None:
raise ResourceNotFoundError(path)
if not dir_entry.isfile():
raise ResourceInvalidError(path, msg="not a file: %(path)s")
return dir_entry.data or b('')
@synchronize
def setcontents(self, path, data, chunk_size=1024*64):
if not isinstance(data, six.binary_type):
return super(MemoryFS, self).setcontents(path, data, chunk_size)
if not self.exists(path):
self.open(path, 'wb').close()
dir_entry = self._get_dir_entry(path)
if not dir_entry.isfile():
raise ResourceInvalidError('Not a directory %(path)s', path)
new_mem_file = StringIO()
new_mem_file.write(data)
dir_entry.mem_file = new_mem_file
@synchronize
def setxattr(self, path, key, value):
dir_entry = self._dir_entry(path)
key = unicode(key)
dir_entry.xattrs[key] = value
@synchronize
def getxattr(self, path, key, default=None):
key = unicode(key)
dir_entry = self._dir_entry(path)
return dir_entry.xattrs.get(key, default)
@synchronize
def delxattr(self, path, key):
dir_entry = self._dir_entry(path)
try:
del dir_entry.xattrs[key]
except KeyError:
pass
@synchronize
def listxattrs(self, path):
dir_entry = self._dir_entry(path)
return dir_entry.xattrs.keys()
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