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"""
fs.rpcfs: client to access an FS via XML-RPC
This module provides the class 'RPCFS' to access a remote FS object over
XML-RPC. You probably want to use this in conjunction with the 'RPCFSServer'
class from the fs.expose.xmlrpc module.
"""
import xmlrpclib
from fs.base import *
from StringIO import StringIO
if hasattr(StringIO,"__exit__"):
class StringIO(StringIO):
pass
else:
class StringIO(StringIO):
def __enter__(self):
return self
def __exit__(self,exc_type,exc_value,traceback):
self.close()
return False
def re_raise_faults(func):
"""Decorator to re-raise XML-RPC faults as proper exceptions."""
def wrapper(*args,**kwds):
try:
return func(*args,**kwds)
except xmlrpclib.Fault, f:
# Make sure it's in a form we can handle
bits = f.faultString.split(" ")
if bits[0] not in ["<type","<class"]:
raise f
# Find the class/type object
bits = " ".join(bits[1:]).split(">:")
cls = bits[0]
msg = ">:".join(bits[1:])
while cls[0] in ["'",'"']:
cls = cls[1:]
while cls[-1] in ["'",'"']:
cls = cls[:-1]
cls = _object_by_name(cls)
# Re-raise using the remainder of the fault code as message
if cls:
raise cls(msg)
raise f
return wrapper
def _object_by_name(name,root=None):
"""Look up an object by dotted-name notation."""
print name, root
bits = name.split(".")
if root is None:
try:
obj = globals()[bits[0]]
except KeyError:
try:
obj = __builtins__[bits[0]]
except KeyError:
obj = __import__(bits[0],globals())
else:
obj = getattr(root,bits[0])
if len(bits) > 1:
return _object_by_name(".".join(bits[1:]),obj)
else:
return obj
class ReRaiseFaults:
"""XML-RPC proxy wrapper that re-raises Faults as proper Exceptions."""
def __init__(self,obj):
self._obj = obj
def __getattr__(self,attr):
val = getattr(self._obj,attr)
if callable(val):
val = re_raise_faults(val)
self.__dict__[attr] = val
return val
class RPCFS(FS):
"""Access a filesystem exposed via XML-RPC.
This class provides the client-side logic for accessing a remote FS
object, and is dual to the RPCFSServer class defined in fs.expose.xmlrpc.
Example:
fs = RPCFS("http://my.server.com/filesystem/location/")
"""
def __init__(self, uri, transport=None):
"""Constructor for RPCFS objects.
The only required argument is the uri of the server to connect
to. This will be passed to the underlying XML-RPC server proxy
object, along with the 'transport' argument if it is provided.
"""
self.uri = uri
self._transport = transport
self.proxy = self._make_proxy()
def _make_proxy(self):
kwds = dict(allow_none=True)
if self._transport is not None:
proxy = xmlrpclib.ServerProxy(self.uri,self._transport,**kwds)
else:
proxy = xmlrpclib.ServerProxy(self.uri,**kwds)
return ReRaiseFaults(proxy)
def __str__(self):
return '<RPCFS: %s>' % (self.uri,)
def __getstate__(self):
state = super(RPCFS,self).__getstate__()
try:
del state['proxy']
except KeyError:
pass
return state
def __setstate__(self,state):
for (k,v) in state.iteritems():
self.__dict__[k] = v
self.proxy = self._make_proxy()
def open(self,path,mode="r"):
# TODO: chunked transport of large files
if "w" in mode:
self.proxy.set_contents(path,xmlrpclib.Binary(""))
if "r" in mode or "a" in mode or "+" in mode:
try:
data = self.proxy.get_contents(path).data
except IOError:
if "w" not in mode and "a" not in mode:
raise ResourceNotFoundError(path)
if not self.isdir(dirname(path)):
raise ParentDirectoryMissingError(path)
self.proxy.set_contents(path,xmlrpclib.Binary(""))
else:
data = ""
f = StringIO(data)
if "a" not in mode:
f.seek(0,0)
else:
f.seek(0,2)
oldflush = f.flush
oldclose = f.close
def newflush():
oldflush()
self.proxy.set_contents(path,xmlrpclib.Binary(f.getvalue()))
def newclose():
f.flush()
oldclose()
f.flush = newflush
f.close = newclose
return f
def exists(self,path):
return self.proxy.exists(path)
def isdir(self,path):
return self.proxy.isdir(path)
def isfile(self,path):
return self.proxy.isfile(path)
def listdir(self,path="./",wildcard=None,full=False,absolute=False,dirs_only=False,files_only=False):
return self.proxy.listdir(path,wildcard,full,absolute,dirs_only,files_only)
def makedir(self,path,recursive=False,allow_recreate=False):
return self.proxy.makedir(path,recursive,allow_recreate)
def remove(self,path):
return self.proxy.remove(path)
def removedir(self,path,recursive=False,force=False):
return self.proxy.removedir(path,recursive,force)
def rename(self,src,dst):
return self.proxy.rename(src,dst)
def getinfo(self,path):
return self.proxy.getinfo(path)
def desc(self,path):
return self.proxy.desc(path)
def getattr(self,path,attr):
return self.proxy.getattr(path,attr)
def setattr(self,path,attr,value):
return self.proxy.setattr(path,attr,value)
def copy(self,src,dst,overwrite=False,chunk_size=16384):
return self.proxy.copy(src,dst,overwrite,chunk_size)
def move(self,src,dst,overwrite=False,chunk_size=16384):
return self.proxy.move(src,dst,overwrite,chunk_size)
def movedir(self,src,dst,overwrite=False,ignore_errors=False,chunk_size=16384):
return self.proxy.movedir(src,dst,overwrite,ignore_errors,chunk_size)
def copydir(self,src,dst,overwrite=False,ignore_errors=False,chunk_size=16384):
return self.proxy.copydir(src,dst,overwrite,ignore_errors,chunk_size)
|
