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"""
Defines the Exception classes thrown by PyFilesystem objects. Exceptions relating
to the underlying 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.
"""
__all__ = ['FSError',
'CreateFailedError',
'PathError',
'InvalidPathError',
'InvalidCharsInPathError',
'OperationFailedError',
'UnsupportedError',
'RemoteConnectionError',
'StorageSpaceError',
'PermissionDeniedError',
'FSClosedError',
'OperationTimeoutError',
'RemoveRootError',
'ResourceError',
'NoSysPathError',
'NoMetaError',
'NoPathURLError',
'ResourceNotFoundError',
'ResourceInvalidError',
'DestinationExistsError',
'DirectoryNotEmptyError',
'ParentDirectoryMissingError',
'ResourceLockedError',
'NoMMapError',
'BackReferenceError',
'convert_fs_errors',
'convert_os_errors',
]
import sys
import errno
import six
from fs.path import *
from fs.local_functools import wraps
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):
keys = {}
for k,v in self.__dict__.iteritems():
if isinstance(v, six.binary_type):
v = v.decode(sys.getfilesystemencoding(), 'replace')
keys[k] = v
return unicode(self.msg, encoding=sys.getfilesystemencoding(), errors='replace') % keys
def __reduce__(self):
return (self.__class__,(),self.__dict__.copy(),)
class CreateFailedError(FSError):
"""An exception thrown when a FS could not be created"""
default_message = "Unable to create filesystem"
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 InvalidPathError(PathError):
"""Base exception for fs paths that can't be mapped on to the underlaying filesystem."""
default_message = "Path is invalid on this filesystem %(path)s"
class InvalidCharsInPathError(InvalidPathError):
"""The path contains characters that are invalid on this filesystem"""
default_message = "Path contains invalid characters: %(path)s"
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 RemoveRootError(OperationFailedError):
default_message = "Can't remove root dir"
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 NoMetaError(FSError):
"""Exception raised when there is no meta value available."""
default_message = "No meta value named '%(meta_name)s' could be retrieved"
def __init__(self, meta_name, msg=None):
self.meta_name = meta_name
super(NoMetaError, self).__init__(msg)
def __reduce__(self):
return (self.__class__,(self.meta_name,),self.__dict__.copy(),)
class NoPathURLError(ResourceError):
"""Exception raised when there is no URL form for a given path."""
default_message = "No URL form: %(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"
class NoMMapError(ResourceError):
"""Exception raise when getmmap fails to create a mmap"""
default_message = "Can't get mmap for %(path)s"
class BackReferenceError(ValueError):
"""Exception raised when too many backrefs exist in a path (ex: '/..', '/docs/../..')."""
def convert_fs_errors(func):
"""Function wrapper to convert FSError instances into OSError."""
@wraps(func)
def wrapper(*args,**kwds):
try:
return func(*args,**kwds)
except ResourceNotFoundError, e:
raise OSError(errno.ENOENT,str(e))
except ParentDirectoryMissingError, e:
if sys.platform == "win32":
raise OSError(errno.ESRCH,str(e))
else:
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.ENETDOWN,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 FSError."""
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.EFAULT:
# This can happen when listdir a directory that is deleted by another thread
# Best to interpret it as a resource not found
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.ENOSPC:
raise StorageSpaceError(opname,path=path,details=e),None,tb
if e.errno == errno.EPERM:
raise PermissionDeniedError(opname,path=path,details=e),None,tb
if hasattr(errno,"ENONET") and e.errno == errno.ENONET:
raise RemoteConnectionError(opname,path=path,details=e),None,tb
if e.errno == errno.ENETDOWN:
raise RemoteConnectionError(opname,path=path,details=e),None,tb
if e.errno == errno.ECONNRESET:
raise RemoteConnectionError(opname,path=path,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
if e.errno == errno.ENAMETOOLONG:
raise PathError(path,details=e),None,tb
if e.errno == errno.EOPNOTSUPP:
raise UnsupportedError(opname,details=e),None,tb
if e.errno == errno.ENOSYS:
raise UnsupportedError(opname,details=e),None,tb
raise OperationFailedError(opname,details=e),None,tb
return wrapper
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