import ctypes from ctypes import c_int, c_char_p, c_void_p, c_uint64 from cnotmuch.globals import nmlib, STATUS, NotmuchError, Enum import logging from datetime import date class Database(object): """Represents a notmuch database (wraps notmuch_database_t) .. note:: Do note that as soon as we tear down 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. We implement reference counting, so that parent objects can be automatically freed when they are not needed anymore, for example:: db = Database('path',create=True) msgs = Query(db,'from:myself').search_messages() This returns a :class:`Messages` which internally contains a reference to the parent :class:`Query` object. Otherwise the Query() would be immediately freed, taking our *msgs* down with it. In this case, the above Query() object will be automatically freed whenever we delete all derived objects, ie in our case: `del (msgs)` would also delete the parent Query (but not the parent Database() as that is still referenced from the variable *db* in which it is stored. Pretty much the same is valid for all other objects in the hierarchy, such as :class:`Query`, :class:`Messages`, :class:`Message`, and :class:`Tags`. """ MODE = Enum(['READ_ONLY','READ_WRITE']) """Constants: Mode in which to open the database""" _std_db_path = None """Class attribute to cache user's default database""" """notmuch_database_get_path (notmuch_database_t *database)""" _get_path = nmlib.notmuch_database_get_path _get_path.restype = c_char_p """notmuch_database_open (const char *path, notmuch_database_mode_t mode)""" _open = nmlib.notmuch_database_open _open.restype = c_void_p """ notmuch_database_find_message """ _find_message = nmlib.notmuch_database_find_message _find_message.restype = c_void_p """notmuch_database_get_all_tags (notmuch_database_t *database)""" _get_all_tags = nmlib.notmuch_database_get_all_tags _get_all_tags.restype = c_void_p """ notmuch_database_create(const char *path):""" _create = nmlib.notmuch_database_create _create.restype = c_void_p 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 default database. If *create* is `True`, the database will always be created in :attr:`MODE.READ_WRITE` mode as creating an empty database for reading only does not make a great deal of sense. :param path: Directory to open/create the database in (see above for behavior if `None`) :type path: `str` or `None` :param create: False to open an existing, True to create a new database. :type create: bool :param mdoe: Mode to open a database in. Always :attr:`MODE`.READ_WRITE when creating a new one. :type mode: :attr:`MODE` :returns: Nothing :exception: :exc:`NotmuchError` in case of failure. """ self._db = None 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, status) else: self.create(path) def create(self, path): """Creates a new notmuch database This function wraps *notmuch_database_create(...)* 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 :returns: Nothing :exception: :exc:`NotmuchError` in case of any failure (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.") res = Database._create(path, MODE.READ_WRITE) if res is None: raise NotmuchError( message="Could not create the specified database") self._db = res def open(self, path, status= MODE.READ_ONLY): """calls notmuch_database_open :returns: Raises :exc:`notmuch.NotmuchError` in case of any failure (after printing an error message on stderr). """ res = Database._open(path, status) if res is None: raise NotmuchError( message="Could not open the specified database") self._db = res def get_path(self): """notmuch_database_get_path (notmuch_database_t *database); """ return Database._get_path(self._db) def find_message(self, msgid): """notmuch_database_find_message :param msgid: The message id :type msgid: string :returns: :class:`Message` or `None` if no message is found or if an out-of-memory situation occurs. :exception: :exc:`NotmuchError` with STATUS.NOT_INITIALIZED if the database was not intitialized. """ if self._db is None: raise NotmuchError(STATUS.NOT_INITIALIZED) msg_p = Database._find_message(self._db, msgid) if msg_p is None: return None return Message(msg_p, self) def get_all_tags(self): """Returns :class:`Tags` with a list of all tags found in the database :returns: :class:`Tags` object or raises :exc:`NotmuchError` with STATUS.NULL_POINTER on error """ if self._db is None: raise NotmuchError(STATUS.NOT_INITIALIZED) tags_p = Database._get_all_tags (self._db) if tags_p == None: raise NotmuchError(STATUS.NULL_POINTER) return Tags(tags_p, self) def __repr__(self): return "'Notmuch DB " + self.get_path() + "'" def __del__(self): """Close and free the notmuch database if needed""" if self._db is not None: logging.debug("Freeing the database now") nmlib.notmuch_database_close(self._db) 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""" from ConfigParser import SafeConfigParser import os.path config = SafeConfigParser() config.read(os.path.expanduser('~/.notmuch-config')) 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 the notmuch_database_t or `None`. This should normally not be needed by a user.""" return self._db #------------------------------------------------------------------------------ class Query(object): """ Wrapper around a notmuch_query_t Do note that as soon as we tear down this object, all derived threads, and messages will be freed as well. """ # constants SORT_OLDEST_FIRST = 0 SORT_NEWEST_FIRST = 1 SORT_MESSAGE_ID = 2 """notmuch_query_create""" _create = nmlib.notmuch_query_create _create.restype = c_void_p """notmuch_query_search_messages""" _search_messages = nmlib.notmuch_query_search_messages _search_messages.restype = c_void_p def __init__(self, db, querystr): """TODO: document""" self._db = None self._query = None self.create(db, querystr) def create(self, db, querystr): """db is a Database() and querystr a string raises NotmuchError STATUS.NOT_INITIALIZED if db is not inited and STATUS.NULL_POINTER if the query creation failed (too little memory) """ if db.db_p is None: raise NotmuchError(STATUS.NOT_INITIALIZED) # create reference to parent db to keep it alive self._db = db # create query, return None if too little mem available query_p = Query._create(db.db_p, querystr) if query_p is None: NotmuchError(STATUS.NULL_POINTER) self._query = query_p def set_sort(self, sort): """notmuch_query_set_sort :param sort: one of Query.SORT_OLDEST_FIRST|SORT_NEWEST_FIRST|SORT_MESSAGE_ID :returns: Nothing, but raises NotmuchError if query is not inited """ if self._query is None: raise NotmuchError(STATUS.NOT_INITIALIZED) nmlib.notmuch_query_set_sort(self._query, sort) def search_messages(self): """notmuch_query_search_messages Returns Messages() or a raises a NotmuchError() """ if self._query is None: raise NotmuchError(STATUS.NOT_INITIALIZED) msgs_p = Query._search_messages(self._query) if msgs_p is None: NotmuchError(STATUS.NULL_POINTER) return Messages(msgs_p,self) def __del__(self): """Close and free the Query""" if self._query is not None: logging.debug("Freeing the Query now") nmlib.notmuch_query_destroy (self._query) #------------------------------------------------------------------------------ class Tags(object): """Wrapper around notmuch_tags_t""" #notmuch_tags_get _get = nmlib.notmuch_tags_get _get.restype = c_char_p def __init__(self, tags_p, parent=None): """ msg_p is a pointer to an notmuch_message_t Structure. If it is None, we will raise an NotmuchError(STATUS.NULL_POINTER). Is passed the parent these tags are derived from, and saves a reference to it, so we can automatically delete the db object once all derived objects are dead. Tags() provides an iterator over all contained tags. However, you will only be able to iterate over the Tags once, because the underlying C function only allows iterating once. #TODO: make the iterator work more than once and cache the tags in the Python object. """ if tags_p is None: NotmuchError(STATUS.NULL_POINTER) self._tags = tags_p #save reference to parent object so we keep it alive self._parent = parent logging.debug("Inited Tags derived from %s" %(repr(parent))) def __iter__(self): """ Make Tags an iterator """ return self def next(self): if self._tags is None: raise NotmuchError(STATUS.NOT_INITIALIZED) if not nmlib.notmuch_tags_valid(self._tags): self._tags = None raise StopIteration tag = Tags._get (self._tags) nmlib.notmuch_tags_move_to_next(self._tags) return tag def __str__(self): """str() of Tags() is a space separated list of tags This iterates over the list of Tags and will therefore 'exhaust' Tags() """ return " ".join(self) def __del__(self): """Close and free the notmuch tags""" if self._tags is not None: logging.debug("Freeing the Tags now") nmlib.notmuch_tags_destroy (self._tags) #------------------------------------------------------------------------------ class Messages(object): """Wrapper around notmuch_messages_t""" #notmuch_tags_get _get = nmlib.notmuch_messages_get _get.restype = c_void_p _collect_tags = nmlib.notmuch_messages_collect_tags _collect_tags.restype = c_void_p def __init__(self, msgs_p, parent=None): """ msg_p is a pointer to an notmuch_messages_t Structure. If it is None, we will raise an NotmuchError(STATUS.NULL_POINTER). If passed the parent query this Messages() is derived from, it saves a reference to it, so we can automatically delete the parent query object once all derived objects are dead. Messages() provides an iterator over all contained Message()s. However, you will only be able to iterate over it once, because the underlying C function only allows iterating once. #TODO: make the iterator work more than once and cache the tags in the Python object. """ if msgs_p is None: NotmuchError(STATUS.NULL_POINTER) self._msgs = msgs_p #store parent, so we keep them alive as long as self is alive self._parent = parent logging.debug("Inited Messages derived from %s" %(str(parent))) def collect_tags(self): """ return the Tags() belonging to the messages Do note that collect_tags will iterate over the messages and therefore will not allow further iterationsl Raises NotmuchError(STATUS.NOT_INITIALIZED) if not inited """ if self._msgs is None: raise NotmuchError(STATUS.NOT_INITIALIZED) # collect all tags (returns NULL on error) tags_p = Messages._collect_tags (self._msgs) #reset _msgs as we iterated over it and can do so only once self._msgs = None if tags_p == None: raise NotmuchError(STATUS.NULL_POINTER) return Tags(tags_p, self) def __iter__(self): """ Make Messages an iterator """ return self def next(self): if self._msgs is None: raise NotmuchError(STATUS.NOT_INITIALIZED) if not nmlib.notmuch_messages_valid(self._msgs): self._msgs = None raise StopIteration msg = Message(Messages._get (self._msgs), self) nmlib.notmuch_messages_move_to_next(self._msgs) return msg def __len__(self): """ Returns the number of contained messages :note: As this iterates over the messages, we will not be able to iterate over them again (as in retrieve them)! """ if self._msgs is None: raise NotmuchError(STATUS.NOT_INITIALIZED) i=0 while nmlib.notmuch_messages_valid(self._msgs): nmlib.notmuch_messages_move_to_next(self._msgs) i += 1 self._msgs = None return i def __del__(self): """Close and free the notmuch Messages""" if self._msgs is not None: logging.debug("Freeing the Messages now") nmlib.notmuch_messages_destroy (self._msgs) #------------------------------------------------------------------------------ class Message(object): """Wrapper around notmuch_message_t""" """notmuch_message_get_filename (notmuch_message_t *message)""" _get_filename = nmlib.notmuch_message_get_filename _get_filename.restype = c_char_p """notmuch_message_get_message_id (notmuch_message_t *message)""" _get_message_id = nmlib.notmuch_message_get_message_id _get_message_id.restype = c_char_p """notmuch_message_get_tags (notmuch_message_t *message)""" _get_tags = nmlib.notmuch_message_get_tags _get_tags.restype = c_void_p _get_date = nmlib.notmuch_message_get_date _get_date.restype = c_uint64 _get_header = nmlib.notmuch_message_get_header _get_header.restype = c_char_p def __init__(self, msg_p, parent=None): """ msg_p is a pointer to an notmuch_message_t Structure. If it is None, we will raise an NotmuchError(STATUS.NULL_POINTER). Is a 'parent' object is passed which this message is derived from, we save a reference to it, so we can automatically delete the parent object once all derived objects are dead. """ if msg_p is None: NotmuchError(STATUS.NULL_POINTER) self._msg = msg_p #keep reference to parent, so we keep it alive self._parent = parent logging.debug("Inited Message derived from %s" %(str(parent))) def get_message_id(self): """ return the msg id Raises NotmuchError(STATUS.NOT_INITIALIZED) if not inited """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) return Message._get_message_id(self._msg) def get_date(self): """returns time_t of the message date For the original textual representation of the Date header from the message call notmuch_message_get_header() with a header value of "date". Raises NotmuchError(STATUS.NOT_INITIALIZED) if not inited """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) return Message._get_date(self._msg) def get_header(self, header): """ TODO document me""" if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) #Returns NULL if any error occurs. header = Message._get_header (self._msg, header) if header == None: raise NotmuchError(STATUS.NULL_POINTER) return header def get_filename(self): """ return the msg filename Raises NotmuchError(STATUS.NOT_INITIALIZED) if not inited """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) return Message._get_filename(self._msg) def get_tags(self): """ return the msg tags Raises NotmuchError(STATUS.NOT_INITIALIZED) if not inited Raises NotmuchError(STATUS.NULL_POINTER) on error. """ if self._msg is None: raise NotmuchError(STATUS.NOT_INITIALIZED) tags_p = Message._get_tags(self._msg) if tags_p == None: raise NotmuchError(STATUS.NULL_POINTER) return Tags(tags_p, self) def __str__(self): """A message() is represented by a 1-line summary""" msg = {} msg['from'] = self.get_header('from') msg['tags'] = str(self.get_tags()) msg['date'] = date.fromtimestamp(self.get_date()) return "%(from)s (%(date)s) (%(tags)s)" % (msg) def format_as_text(self): """ Output like notmuch show """ return str(self) def __del__(self): """Close and free the notmuch Message""" if self._msg is not None: logging.debug("Freeing the Message now") nmlib.notmuch_message_destroy (self._msg)