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"""
Defines the Exception classes thrown by PyFilesystem objects. Exceptions relating to the underling filesystem are translated in to one of the following Exceptions. Exceptions that relate to a path store that path in `self.path`.
All Exception classes are derived from `FSError` which can be used as a catch-all exception.
"""
import sys
import errno
from fs.path import *
try:
from functools import wraps
except ImportError:
wraps = lambda f: lambda f: f
class FSError(Exception):
"""Base exception class for the FS module."""
default_message = "Unspecified error"
def __init__(self,msg=None,details=None):
if msg is None:
msg = self.default_message
self.msg = msg
self.details = details
def __str__(self):
keys = {}
for k,v in self.__dict__.iteritems():
if isinstance(v,unicode):
v = v.encode(sys.getfilesystemencoding())
keys[k] = v
return str(self.msg % keys)
def __unicode__(self):
return unicode(self.msg) % self.__dict__
def __getstate__(self):
return self.__dict__.copy()
class PathError(FSError):
"""Exception for errors to do with a path string.
"""
default_message = "Path is invalid: %(path)s"
def __init__(self,path="",**kwds):
self.path = path
super(PathError,self).__init__(**kwds)
class OperationFailedError(FSError):
"""Base exception class for errors associated with a specific operation."""
default_message = "Unable to %(opname)s: unspecified error [%(errno)s - %(details)s]"
def __init__(self,opname="",path=None,**kwds):
self.opname = opname
self.path = path
self.errno = getattr(kwds.get("details",None),"errno",None)
super(OperationFailedError,self).__init__(**kwds)
class UnsupportedError(OperationFailedError):
"""Exception raised for operations that are not supported by the FS."""
default_message = "Unable to %(opname)s: not supported by this filesystem"
class RemoteConnectionError(OperationFailedError):
"""Exception raised when operations encounter remote connection trouble."""
default_message = "%(opname)s: remote connection errror"
class StorageSpaceError(OperationFailedError):
"""Exception raised when operations encounter storage space trouble."""
default_message = "Unable to %(opname)s: insufficient storage space"
class PermissionDeniedError(OperationFailedError):
default_message = "Unable to %(opname)s: permission denied"
class FSClosedError(OperationFailedError):
default_message = "Unable to %(opname)s: the FS has been closed"
class OperationTimeoutError(OperationFailedError):
default_message = "Unable to %(opname)s: operation timed out"
class ResourceError(FSError):
"""Base exception class for error associated with a specific resource."""
default_message = "Unspecified resource error: %(path)s"
def __init__(self,path="",**kwds):
self.path = path
self.opname = kwds.pop("opname",None)
super(ResourceError,self).__init__(**kwds)
class NoSysPathError(ResourceError):
"""Exception raised when there is no syspath for a given path."""
default_message = "No mapping to OS filesystem: %(path)s"
class ResourceNotFoundError(ResourceError):
"""Exception raised when a required resource is not found."""
default_message = "Resource not found: %(path)s"
class ResourceInvalidError(ResourceError):
"""Exception raised when a resource is the wrong type."""
default_message = "Resource is invalid: %(path)s"
class DestinationExistsError(ResourceError):
"""Exception raised when a target destination already exists."""
default_message = "Destination exists: %(path)s"
class DirectoryNotEmptyError(ResourceError):
"""Exception raised when a directory to be removed is not empty."""
default_message = "Directory is not empty: %(path)s"
class ParentDirectoryMissingError(ResourceError):
"""Exception raised when a parent directory is missing."""
default_message = "Parent directory is missing: %(path)s"
class ResourceLockedError(ResourceError):
"""Exception raised when a resource can't be used because it is locked."""
default_message = "Resource is locked: %(path)s"
def convert_fs_errors(func):
"""Function wrapper to convert FSError instances into OSErrors."""
@wraps(func)
def wrapper(*args,**kwds):
try:
return func(*args,**kwds)
except ResourceNotFoundError, e:
raise OSError(errno.ENOENT,str(e))
except ResourceInvalidError, e:
raise OSError(errno.EINVAL,str(e))
except PermissionDeniedError, e:
raise OSError(errno.EACCES,str(e))
except ResourceLockedError, e:
if sys.platform == "win32":
raise WindowsError(32,str(e))
else:
raise OSError(errno.EACCES,str(e))
except DirectoryNotEmptyError, e:
raise OSError(errno.ENOTEMPTY,str(e))
except DestinationExistsError, e:
raise OSError(errno.EEXIST,str(e))
except StorageSpaceError, e:
raise OSError(errno.ENOSPC,str(e))
except RemoteConnectionError, e:
raise OSError(errno.ENONET,str(e))
except UnsupportedError, e:
raise OSError(errno.ENOSYS,str(e))
except FSError, e:
raise OSError(errno.EFAULT,str(e))
return wrapper
def convert_os_errors(func):
"""Function wrapper to convert OSError/IOError instances into FSErrors."""
opname = func.__name__
@wraps(func)
def wrapper(self,*args,**kwds):
try:
return func(self,*args,**kwds)
except (OSError,IOError), e:
(exc_type,exc_inst,tb) = sys.exc_info()
path = getattr(e,"filename",None)
if path and path[0] == "/" and hasattr(self,"root_path"):
path = normpath(path)
if isprefix(self.root_path,path):
path = path[len(self.root_path):]
if not hasattr(e,"errno") or not e.errno:
raise OperationFailedError(opname,details=e),None,tb
if e.errno == errno.ENOENT:
raise ResourceNotFoundError(path,opname=opname,details=e),None,tb
if e.errno == errno.ESRCH:
raise ResourceNotFoundError(path,opname=opname,details=e),None,tb
if e.errno == errno.ENOTEMPTY:
raise DirectoryNotEmptyError(path,opname=opname,details=e),None,tb
if e.errno == errno.EEXIST:
raise DestinationExistsError(path,opname=opname,details=e),None,tb
if e.errno == 183: # some sort of win32 equivalent to EEXIST
raise DestinationExistsError(path,opname=opname,details=e),None,tb
if e.errno == errno.ENOTDIR:
raise ResourceInvalidError(path,opname=opname,details=e),None,tb
if e.errno == errno.EISDIR:
raise ResourceInvalidError(path,opname=opname,details=e),None,tb
if e.errno == errno.EINVAL:
raise ResourceInvalidError(path,opname=opname,details=e),None,tb
if e.errno == errno.EOPNOTSUPP:
raise UnsupportedError(opname,details=e),None,tb
if e.errno == errno.ENOSPC:
raise StorageSpaceError(opname,details=e),None,tb
if e.errno == errno.EPERM:
raise PermissionDeniedError(opname,details=e),None,tb
if e.errno == errno.EACCES:
if sys.platform == "win32":
if e.args[0] and e.args[0] == 32:
raise ResourceLockedError(path,opname=opname,details=e),None,tb
raise PermissionDeniedError(opname,details=e),None,tb
# Sometimes windows gives some random errors...
if sys.platform == "win32":
if e.errno in (13,):
raise ResourceInvalidError(path,opname=opname,details=e),None,tb
raise OperationFailedError(opname,details=e),None,tb
return wrapper
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