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"""
This file is part of notmuch.
Notmuch is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
Notmuch is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with notmuch. If not, see <http://www.gnu.org/licenses/>.
Copyright 2010 Sebastian Spaeth <Sebastian@SSpaeth.de>'
"""
from ctypes import CDLL, c_char_p, c_int
from ctypes.util import find_library
#-----------------------------------------------------------------------------
#package-global instance of the notmuch library
try:
nmlib = CDLL("libnotmuch.so.1")
except:
raise ImportError("Could not find shared 'notmuch' library.")
class Enum(object):
"""Provides ENUMS as "code=Enum(['a','b','c'])" where code.a=0 etc..."""
def __init__(self, names):
for number, name in enumerate(names):
setattr(self, name, number)
class Status(Enum):
"""Enum with a string representation of a notmuch_status_t value."""
_status2str = nmlib.notmuch_status_to_string
_status2str.restype = c_char_p
_status2str.argtypes = [c_int]
def __init__(self, statuslist):
"""It is initialized with a list of strings that are available as
Status().string1 - Status().stringn attributes.
"""
super(Status, self).__init__(statuslist)
@classmethod
def status2str(self, status):
"""Get a string representation of a notmuch_status_t value."""
# define strings for custom error messages
if status == STATUS.NOT_INITIALIZED:
return "Operation on uninitialized object impossible."
return str(Status._status2str(status))
STATUS = Status(['SUCCESS',
'OUT_OF_MEMORY',
'READ_ONLY_DATABASE',
'XAPIAN_EXCEPTION',
'FILE_ERROR',
'FILE_NOT_EMAIL',
'DUPLICATE_MESSAGE_ID',
'NULL_POINTER',
'TAG_TOO_LONG',
'UNBALANCED_FREEZE_THAW',
'UNBALANCED_ATOMIC',
'NOT_INITIALIZED'])
"""STATUS is a class, whose attributes provide constants that serve as return
indicators for notmuch functions. Currently the following ones are defined. For
possible return values and specific meaning for each method, see the method
description.
* SUCCESS
* OUT_OF_MEMORY
* READ_ONLY_DATABASE
* XAPIAN_EXCEPTION
* FILE_ERROR
* FILE_NOT_EMAIL
* DUPLICATE_MESSAGE_ID
* NULL_POINTER
* TAG_TOO_LONG
* UNBALANCED_FREEZE_THAW
* UNBALANCED_ATOMIC
* NOT_INITIALIZED
Invoke the class method `notmuch.STATUS.status2str` with a status value as
argument to receive a human readable string"""
STATUS.__name__ = 'STATUS'
class NotmuchError(Exception):
"""Is initiated with a (notmuch.STATUS[, message=None]). It will not
return an instance of the class NotmuchError, but a derived instance
of a more specific Error Message, e.g. OutOfMemoryError. Each status
but SUCCESS has a corresponding subclassed Exception."""
@classmethod
def get_subclass_exc(cls, status, message=None):
"""Returns a fine grained Exception() type,detailing the error status"""
subclasses = {
STATUS.OUT_OF_MEMORY: OutOfMemoryError,
STATUS.READ_ONLY_DATABASE: ReadOnlyDatabaseError,
STATUS.XAPIAN_EXCEPTION: XapianError,
STATUS.FILE_ERROR: FileError,
STATUS.FILE_NOT_EMAIL: FileNotEmailError,
STATUS.DUPLICATE_MESSAGE_ID: DuplicateMessageIdError,
STATUS.NULL_POINTER: NullPointerError,
STATUS.TAG_TOO_LONG: TagTooLongError,
STATUS.UNBALANCED_FREEZE_THAW: UnbalancedFreezeThawError,
STATUS.UNBALANCED_ATOMIC: UnbalancedAtomicError,
STATUS.NOT_INITIALIZED: NotInitializedError
}
assert 0 < status <= len(subclasses)
return subclasses[status](status, message)
def __init__(self, status, message=None):
self.status = status
self.message = message
def __str__(self):
if self.message is not None:
return self.message
elif self.status is not None:
return STATUS.status2str(self.status)
else:
return 'Unknown error'
# List of Subclassed exceptions that correspond to STATUS values and are
# subclasses of NotmuchError:
class OutOfMemoryError(NotmuchError):
pass
class ReadOnlyDatabaseError(NotmuchError):
pass
class XapianError(NotmuchError):
pass
class FileError(NotmuchError):
pass
class FileNotEmailError(NotmuchError):
pass
class DuplicateMessageIdError(NotmuchError):
pass
class NullPointerError(NotmuchError):
pass
class TagTooLongError(NotmuchError):
pass
class UnbalancedFreezeThawError(NotmuchError):
pass
class UnbalancedAtomicError(NotmuchError):
pass
class NotInitializedError(NotmuchError):
pass
def _str(value):
"""Ensure a nicely utf-8 encoded string to pass to libnotmuch
C++ code expects strings to be well formatted and
unicode strings to have no null bytes."""
if not isinstance(value, basestring):
raise TypeError("Expected str or unicode, got %s" % str(type(value)))
if isinstance(value, unicode):
return value.encode('UTF-8')
return value
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