""" 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. See :meth:`close` for more information. .. note:: Any function in this class can and will throw an :exc:`NotInitializedError` if the database was not intitialized properly. """ _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, POINTER(NotmuchDirectoryP)] _get_directory.restype = c_uint """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: 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. .. warning:: This function closes the notmuch database. From that point on every method invoked on any object ever derived from the closed database may cease to function and raise a NotmuchError. ''' 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() # 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 = NotmuchDirectoryP() status = Database._get_directory(self._db, _str(path), byref(dir_p)) if status != STATUS.SUCCESS: raise NotmuchError(status) if not dir_p: return None # 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