"""
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 .
Copyright 2010 Sebastian Spaeth '
"""
import os
import codecs
from ctypes import c_char_p, c_void_p, c_uint, byref, POINTER
from notmuch.globals import (
nmlib,
Enum,
_str,
NotmuchDatabaseP,
NotmuchDirectoryP,
NotmuchMessageP,
NotmuchTagsP,
)
from .errors import (
STATUS,
FileError,
NotmuchError,
NullPointerError,
NotInitializedError,
ReadOnlyDatabaseError,
)
from notmuch.message import Message
from notmuch.tag import Tags
from .query import Query
from .directory import Directory
class Database(object):
"""The :class:`Database` is the highest-level object that notmuch
provides. It references a notmuch database, and can be opened in
read-only or read-write mode. A :class:`Query` can be derived from
or be applied to a specific database to find messages. Also adding
and removing messages to the database happens via this
object. Modifications to the database are not atmic by default (see
:meth:`begin_atomic`) and once a database has been modified, all
other database objects pointing to the same data-base will throw an
:exc:`XapianError` as the underlying database has been
modified. Close and reopen the database to continue working with it.
:class:`Database` objects implement the context manager protocol
so you can use the :keyword:`with` statement to ensure that the
database is properly closed.
.. note::
Any function in this class can and will throw an
:exc:`NotInitializedError` if the database was not intitialized
properly.
.. note::
Do remember that as soon as we tear down (e.g. via `del db`) this
object, all underlying derived objects such as queries, threads,
messages, tags etc will be freed by the underlying library as well.
Accessing these objects will lead to segfaults and other unexpected
behavior. See above for more details.
"""
_std_db_path = None
"""Class attribute to cache user's default database"""
MODE = Enum(['READ_ONLY', 'READ_WRITE'])
"""Constants: Mode in which to open the database"""
"""notmuch_database_get_directory"""
_get_directory = nmlib.notmuch_database_get_directory
_get_directory.argtypes = [NotmuchDatabaseP, c_char_p]
_get_directory.restype = NotmuchDirectoryP
"""notmuch_database_get_path"""
_get_path = nmlib.notmuch_database_get_path
_get_path.argtypes = [NotmuchDatabaseP]
_get_path.restype = c_char_p
"""notmuch_database_get_version"""
_get_version = nmlib.notmuch_database_get_version
_get_version.argtypes = [NotmuchDatabaseP]
_get_version.restype = c_uint
"""notmuch_database_open"""
_open = nmlib.notmuch_database_open
_open.argtypes = [c_char_p, c_uint, POINTER(NotmuchDatabaseP)]
_open.restype = c_uint
"""notmuch_database_upgrade"""
_upgrade = nmlib.notmuch_database_upgrade
_upgrade.argtypes = [NotmuchDatabaseP, c_void_p, c_void_p]
_upgrade.restype = c_uint
""" notmuch_database_find_message"""
_find_message = nmlib.notmuch_database_find_message
_find_message.argtypes = [NotmuchDatabaseP, c_char_p,
POINTER(NotmuchMessageP)]
_find_message.restype = c_uint
"""notmuch_database_find_message_by_filename"""
_find_message_by_filename = nmlib.notmuch_database_find_message_by_filename
_find_message_by_filename.argtypes = [NotmuchDatabaseP, c_char_p,
POINTER(NotmuchMessageP)]
_find_message_by_filename.restype = c_uint
"""notmuch_database_get_all_tags"""
_get_all_tags = nmlib.notmuch_database_get_all_tags
_get_all_tags.argtypes = [NotmuchDatabaseP]
_get_all_tags.restype = NotmuchTagsP
"""notmuch_database_create"""
_create = nmlib.notmuch_database_create
_create.argtypes = [c_char_p, POINTER(NotmuchDatabaseP)]
_create.restype = c_uint
def __init__(self, path = None, create = False,
mode = MODE.READ_ONLY):
"""If *path* is `None`, we will try to read a users notmuch
configuration and use his configured database. The location of the
configuration file can be specified through the environment variable
*NOTMUCH_CONFIG*, falling back to the default `~/.notmuch-config`.
If *create* is `True`, the database will always be created in
:attr:`MODE`.READ_WRITE mode. Default mode for opening is READ_ONLY.
:param path: Directory to open/create the database in (see
above for behavior if `None`)
:type path: `str` or `None`
:param create: Pass `False` to open an existing, `True` to create a new
database.
:type create: bool
:param mode: Mode to open a database in. Is always
:attr:`MODE`.READ_WRITE when creating a new one.
:type mode: :attr:`MODE`
:raises: :exc:`NotmuchError` or derived exception in case of
failure.
"""
self._db = None
self.mode = mode
if path is None:
# no path specified. use a user's default database
if Database._std_db_path is None:
#the following line throws a NotmuchError if it fails
Database._std_db_path = self._get_user_default_db()
path = Database._std_db_path
if create == False:
self.open(path, mode)
else:
self.create(path)
_destroy = nmlib.notmuch_database_destroy
_destroy.argtypes = [NotmuchDatabaseP]
_destroy.restype = None
def __del__(self):
if self._db:
self._destroy(self._db)
def _assert_db_is_initialized(self):
"""Raises :exc:`NotInitializedError` if self._db is `None`"""
if not self._db:
raise NotInitializedError()
def create(self, path):
"""Creates a new notmuch database
This function is used by __init__() and usually does not need
to be called directly. It wraps the underlying
*notmuch_database_create* function and creates a new notmuch
database at *path*. It will always return a database in :attr:`MODE`
.READ_WRITE mode as creating an empty database for
reading only does not make a great deal of sense.
:param path: A directory in which we should create the database.
:type path: str
:raises: :exc:`NotmuchError` in case of any failure
(possibly after printing an error message on stderr).
"""
if self._db is not None:
raise NotmuchError(message="Cannot create db, this Database() "
"already has an open one.")
db = NotmuchDatabaseP()
status = Database._create(_str(path), Database.MODE.READ_WRITE, byref(db))
if status != STATUS.SUCCESS:
raise NotmuchError(status)
self._db = db
return status
def open(self, path, mode=0):
"""Opens an existing database
This function is used by __init__() and usually does not need
to be called directly. It wraps the underlying
*notmuch_database_open* function.
:param status: Open the database in read-only or read-write mode
:type status: :attr:`MODE`
:raises: Raises :exc:`NotmuchError` in case of any failure
(possibly after printing an error message on stderr).
"""
db = NotmuchDatabaseP()
status = Database._open(_str(path), mode, byref(db))
if status != STATUS.SUCCESS:
raise NotmuchError(status)
self._db = db
return status
_close = nmlib.notmuch_database_close
_close.argtypes = [NotmuchDatabaseP]
_close.restype = None
def close(self):
'''
Closes the notmuch database.
'''
if self._db:
self._close(self._db)
def __enter__(self):
'''
Implements the context manager protocol.
'''
return self
def __exit__(self, exc_type, exc_value, traceback):
'''
Implements the context manager protocol.
'''
self.close()
def get_path(self):
"""Returns the file path of an open database"""
self._assert_db_is_initialized()
return Database._get_path(self._db).decode('utf-8')
def get_version(self):
"""Returns the database format version
:returns: The database version as positive integer
"""
self._assert_db_is_initialized()
return Database._get_version(self._db)
_needs_upgrade = nmlib.notmuch_database_needs_upgrade
_needs_upgrade.argtypes = [NotmuchDatabaseP]
_needs_upgrade.restype = bool
def needs_upgrade(self):
"""Does this database need to be upgraded before writing to it?
If this function returns `True` then no functions that modify the
database (:meth:`add_message`,
:meth:`Message.add_tag`, :meth:`Directory.set_mtime`,
etc.) will work unless :meth:`upgrade` is called successfully first.
:returns: `True` or `False`
"""
self._assert_db_is_initialized()
return self._needs_upgrade(self._db)
def upgrade(self):
"""Upgrades the current database
After opening a database in read-write mode, the client should
check if an upgrade is needed (notmuch_database_needs_upgrade) and
if so, upgrade with this function before making any modifications.
NOT IMPLEMENTED: The optional progress_notify callback can be
used by the caller to provide progress indication to the
user. If non-NULL it will be called periodically with
'progress' as a floating-point value in the range of [0.0..1.0]
indicating the progress made so far in the upgrade process.
:TODO: catch exceptions, document return values and etc...
"""
self._assert_db_is_initialized()
status = Database._upgrade(self._db, None, None)
#TODO: catch exceptions, document return values and etc
return status
_begin_atomic = nmlib.notmuch_database_begin_atomic
_begin_atomic.argtypes = [NotmuchDatabaseP]
_begin_atomic.restype = c_uint
def begin_atomic(self):
"""Begin an atomic database operation
Any modifications performed between a successful
:meth:`begin_atomic` and a :meth:`end_atomic` will be applied to
the database atomically. Note that, unlike a typical database
transaction, this only ensures atomicity, not durability;
neither begin nor end necessarily flush modifications to disk.
:returns: :attr:`STATUS`.SUCCESS or raises
:raises: :exc:`NotmuchError`: :attr:`STATUS`.XAPIAN_EXCEPTION
Xapian exception occurred; atomic section not entered.
*Added in notmuch 0.9*"""
self._assert_db_is_initialized()
status = self._begin_atomic(self._db)
if status != STATUS.SUCCESS:
raise NotmuchError(status)
return status
_end_atomic = nmlib.notmuch_database_end_atomic
_end_atomic.argtypes = [NotmuchDatabaseP]
_end_atomic.restype = c_uint
def end_atomic(self):
"""Indicate the end of an atomic database operation
See :meth:`begin_atomic` for details.
:returns: :attr:`STATUS`.SUCCESS or raises
:raises:
:exc:`NotmuchError`:
:attr:`STATUS`.XAPIAN_EXCEPTION
A Xapian exception occurred; atomic section not
ended.
:attr:`STATUS`.UNBALANCED_ATOMIC:
end_atomic has been called more times than begin_atomic.
*Added in notmuch 0.9*"""
self._assert_db_is_initialized()
status = self._end_atomic(self._db)
if status != STATUS.SUCCESS:
raise NotmuchError(status)
return status
def get_directory(self, path):
"""Returns a :class:`Directory` of path,
(creating it if it does not exist(?))
:param path: An unicode string containing the path relative to the path
of database (see :meth:`get_path`), or else should be an absolute
path with initial components that match the path of 'database'.
:returns: :class:`Directory` or raises an exception.
:raises: :exc:`FileError` if path is not relative database or absolute
with initial components same as database.
:raises: :exc:`ReadOnlyDatabaseError` if the database has not been
opened in read-write mode
"""
self._assert_db_is_initialized()
# work around libnotmuch calling exit(3), see
# id:20120221002921.8534.57091@thinkbox.jade-hamburg.de
# TODO: remove once this issue is resolved
if self.mode != Database.MODE.READ_WRITE:
raise ReadOnlyDatabaseError('The database has to be opened in '
'read-write mode for get_directory')
# sanity checking if path is valid, and make path absolute
if path and path[0] == os.sep:
# we got an absolute path
if not path.startswith(self.get_path()):
# but its initial components are not equal to the db path
raise FileError('Database().get_directory() called '
'with a wrong absolute path')
abs_dirpath = path
else:
#we got a relative path, make it absolute
abs_dirpath = os.path.abspath(os.path.join(self.get_path(), path))
dir_p = Database._get_directory(self._db, _str(path))
# return the Directory, init it with the absolute path
return Directory(abs_dirpath, dir_p, self)
_add_message = nmlib.notmuch_database_add_message
_add_message.argtypes = [NotmuchDatabaseP, c_char_p,
POINTER(NotmuchMessageP)]
_add_message.restype = c_uint
def add_message(self, filename, sync_maildir_flags=False):
"""Adds a new message to the database
:param filename: should be a path relative to the path of the
open database (see :meth:`get_path`), or else should be an
absolute filename with initial components that match the
path of the database.
The file should be a single mail message (not a
multi-message mbox) that is expected to remain at its
current location, since the notmuch database will reference
the filename, and will not copy the entire contents of the
file.
:param sync_maildir_flags: If the message contains Maildir
flags, we will -depending on the notmuch configuration- sync
those tags to initial notmuch tags, if set to `True`. It is
`False` by default to remain consistent with the libnotmuch
API. You might want to look into the underlying method
:meth:`Message.maildir_flags_to_tags`.
:returns: On success, we return
1) a :class:`Message` object that can be used for things
such as adding tags to the just-added message.
2) one of the following :attr:`STATUS` values:
:attr:`STATUS`.SUCCESS
Message successfully added to database.
:attr:`STATUS`.DUPLICATE_MESSAGE_ID
Message has the same message ID as another message already
in the database. The new filename was successfully added
to the list of the filenames for the existing message.
:rtype: 2-tuple(:class:`Message`, :attr:`STATUS`)
:raises: Raises a :exc:`NotmuchError` with the following meaning.
If such an exception occurs, nothing was added to the database.
:attr:`STATUS`.FILE_ERROR
An error occurred trying to open the file, (such as
permission denied, or file not found, etc.).
:attr:`STATUS`.FILE_NOT_EMAIL
The contents of filename don't look like an email
message.
:attr:`STATUS`.READ_ONLY_DATABASE
Database was opened in read-only mode so no message can
be added.
"""
self._assert_db_is_initialized()
msg_p = NotmuchMessageP()
status = self._add_message(self._db, _str(filename), byref(msg_p))
if not status in [STATUS.SUCCESS, STATUS.DUPLICATE_MESSAGE_ID]:
raise NotmuchError(status)
#construct Message() and return
msg = Message(msg_p, self)
#automatic sync initial tags from Maildir flags
if sync_maildir_flags:
msg.maildir_flags_to_tags()
return (msg, status)
_remove_message = nmlib.notmuch_database_remove_message
_remove_message.argtypes = [NotmuchDatabaseP, c_char_p]
_remove_message.restype = c_uint
def remove_message(self, filename):
"""Removes a message (filename) from the given notmuch database
Note that only this particular filename association is removed from
the database. If the same message (as determined by the message ID)
is still available via other filenames, then the message will
persist in the database for those filenames. When the last filename
is removed for a particular message, the database content for that
message will be entirely removed.
:returns: A :attr:`STATUS` value with the following meaning:
:attr:`STATUS`.SUCCESS
The last filename was removed and the message was removed
from the database.
:attr:`STATUS`.DUPLICATE_MESSAGE_ID
This filename was removed but the message persists in the
database with at least one other filename.
:raises: Raises a :exc:`NotmuchError` with the following meaning.
If such an exception occurs, nothing was removed from the
database.
:attr:`STATUS`.READ_ONLY_DATABASE
Database was opened in read-only mode so no message can be
removed.
"""
self._assert_db_is_initialized()
return self._remove_message(self._db, _str(filename))
def find_message(self, msgid):
"""Returns a :class:`Message` as identified by its message ID
Wraps the underlying *notmuch_database_find_message* function.
:param msgid: The message ID
:type msgid: unicode or str
:returns: :class:`Message` or `None` if no message is found.
:raises:
:exc:`OutOfMemoryError`
If an Out-of-memory occured while constructing the message.
:exc:`XapianError`
In case of a Xapian Exception. These exceptions
include "Database modified" situations, e.g. when the
notmuch database has been modified by another program
in the meantime. In this case, you should close and
reopen the database and retry.
:exc:`NotInitializedError` if
the database was not intitialized.
"""
self._assert_db_is_initialized()
msg_p = NotmuchMessageP()
status = Database._find_message(self._db, _str(msgid), byref(msg_p))
if status != STATUS.SUCCESS:
raise NotmuchError(status)
return msg_p and Message(msg_p, self) or None
def find_message_by_filename(self, filename):
"""Find a message with the given filename
:returns: If the database contains a message with the given
filename, then a class:`Message:` is returned. This
function returns None if no message is found with the given
filename.
:raises: :exc:`OutOfMemoryError` if an Out-of-memory occured while
constructing the message.
:raises: :exc:`XapianError` in case of a Xapian Exception.
These exceptions include "Database modified"
situations, e.g. when the notmuch database has been
modified by another program in the meantime. In this
case, you should close and reopen the database and
retry.
:raises: :exc:`NotInitializedError` if the database was not
intitialized.
:raises: :exc:`ReadOnlyDatabaseError` if the database has not been
opened in read-write mode
*Added in notmuch 0.9*"""
self._assert_db_is_initialized()
# work around libnotmuch calling exit(3), see
# id:20120221002921.8534.57091@thinkbox.jade-hamburg.de
# TODO: remove once this issue is resolved
if self.mode != Database.MODE.READ_WRITE:
raise ReadOnlyDatabaseError('The database has to be opened in '
'read-write mode for get_directory')
msg_p = NotmuchMessageP()
status = Database._find_message_by_filename(self._db, _str(filename),
byref(msg_p))
if status != STATUS.SUCCESS:
raise NotmuchError(status)
return msg_p and Message(msg_p, self) or None
def get_all_tags(self):
"""Returns :class:`Tags` with a list of all tags found in the database
:returns: :class:`Tags`
:execption: :exc:`NotmuchError` with :attr:`STATUS`.NULL_POINTER
on error
"""
self._assert_db_is_initialized()
tags_p = Database._get_all_tags(self._db)
if tags_p == None:
raise NullPointerError()
return Tags(tags_p, self)
def create_query(self, querystring):
"""Returns a :class:`Query` derived from this database
This is a shorthand method for doing::
# short version
# Automatically frees the Database() when 'q' is deleted
q = Database(dbpath).create_query('from:"Biene Maja"')
# long version, which is functionally equivalent but will keep the
# Database in the 'db' variable around after we delete 'q':
db = Database(dbpath)
q = Query(db,'from:"Biene Maja"')
This function is a python extension and not in the underlying C API.
"""
return Query(self, querystring)
def __repr__(self):
return "'Notmuch DB " + self.get_path() + "'"
def _get_user_default_db(self):
""" Reads a user's notmuch config and returns his db location
Throws a NotmuchError if it cannot find it"""
try:
# python3.x
from configparser import SafeConfigParser
except ImportError:
# python2.x
from ConfigParser import SafeConfigParser
config = SafeConfigParser()
conf_f = os.getenv('NOTMUCH_CONFIG',
os.path.expanduser('~/.notmuch-config'))
config.readfp(codecs.open(conf_f, 'r', 'utf-8'))
if not config.has_option('database', 'path'):
raise NotmuchError(message="No DB path specified"
" and no user default found")
return config.get('database', 'path')
@property
def db_p(self):
"""Property returning a pointer to `notmuch_database_t` or `None`
This should normally not be needed by a user (and is not yet
guaranteed to remain stable in future versions).
"""
return self._db