mailbox.py
| 79.3 KB | Satir:
0
| py
Geri
"""Read/write support for Maildir, mbox, MH, Babyl, and MMDF mailboxes.""" # Notes for authors of new mailbox subclasses: # # Remember to fsync() changes to disk before closing a modified file # or returning from a flush() method. See functions _sync_flush() and # _sync_close(). import sys import os import time import calendar import socket import errno import copy import email import email.message import email.generator import StringIO try: if sys.platform == 'os2emx': # OS/2 EMX fcntl() not adequate raise ImportError import fcntl except ImportError: fcntl = None import warnings with warnings.catch_warnings(): if sys.py3kwarning: warnings.filterwarnings("ignore", ".*rfc822 has been removed", DeprecationWarning) import rfc822 __all__ = [ 'Mailbox', 'Maildir', 'mbox', 'MH', 'Babyl', 'MMDF', 'Message', 'MaildirMessage', 'mboxMessage', 'MHMessage', 'BabylMessage', 'MMDFMessage', 'UnixMailbox', 'PortableUnixMailbox', 'MmdfMailbox', 'MHMailbox', 'BabylMailbox' ] class Mailbox: """A group of messages in a particular place.""" def __init__(self, path, factory=None, create=True): """Initialize a Mailbox instance.""" self._path = os.path.abspath(os.path.expanduser(path)) self._factory = factory def add(self, message): """Add message and return assigned key.""" raise NotImplementedError('Method must be implemented by subclass') def remove(self, key): """Remove the keyed message; raise KeyError if it doesn't exist.""" raise NotImplementedError('Method must be implemented by subclass') def __delitem__(self, key): self.remove(key) def discard(self, key): """If the keyed message exists, remove it.""" try: self.remove(key) except KeyError: pass def __setitem__(self, key, message): """Replace the keyed message; raise KeyError if it doesn't exist.""" raise NotImplementedError('Method must be implemented by subclass') def get(self, key, default=None): """Return the keyed message, or default if it doesn't exist.""" try: return self.__getitem__(key) except KeyError: return default def __getitem__(self, key): """Return the keyed message; raise KeyError if it doesn't exist.""" if not self._factory: return self.get_message(key) else: return self._factory(self.get_file(key)) def get_message(self, key): """Return a Message representation or raise a KeyError.""" raise NotImplementedError('Method must be implemented by subclass') def get_string(self, key): """Return a string representation or raise a KeyError.""" raise NotImplementedError('Method must be implemented by subclass') def get_file(self, key): """Return a file-like representation or raise a KeyError.""" raise NotImplementedError('Method must be implemented by subclass') def iterkeys(self): """Return an iterator over keys.""" raise NotImplementedError('Method must be implemented by subclass') def keys(self): """Return a list of keys.""" return list(self.iterkeys()) def itervalues(self): """Return an iterator over all messages.""" for key in self.iterkeys(): try: value = self[key] except KeyError: continue yield value def __iter__(self): return self.itervalues() def values(self): """Return a list of messages. Memory intensive.""" return list(self.itervalues()) def iteritems(self): """Return an iterator over (key, message) tuples.""" for key in self.iterkeys(): try: value = self[key] except KeyError: continue yield (key, value) def items(self): """Return a list of (key, message) tuples. Memory intensive.""" return list(self.iteritems()) def has_key(self, key): """Return True if the keyed message exists, False otherwise.""" raise NotImplementedError('Method must be implemented by subclass') def __contains__(self, key): return self.has_key(key) def __len__(self): """Return a count of messages in the mailbox.""" raise NotImplementedError('Method must be implemented by subclass') def clear(self): """Delete all messages.""" for key in self.iterkeys(): self.discard(key) def pop(self, key, default=None): """Delete the keyed message and return it, or default.""" try: result = self[key] except KeyError: return default self.discard(key) return result def popitem(self): """Delete an arbitrary (key, message) pair and return it.""" for key in self.iterkeys(): return (key, self.pop(key)) # This is only run once. else: raise KeyError('No messages in mailbox') def update(self, arg=None): """Change the messages that correspond to certain keys.""" if hasattr(arg, 'iteritems'): source = arg.iteritems() elif hasattr(arg, 'items'): source = arg.items() else: source = arg bad_key = False for key, message in source: try: self[key] = message except KeyError: bad_key = True if bad_key: raise KeyError('No message with key(s)') def flush(self): """Write any pending changes to the disk.""" raise NotImplementedError('Method must be implemented by subclass') def lock(self): """Lock the mailbox.""" raise NotImplementedError('Method must be implemented by subclass') def unlock(self): """Unlock the mailbox if it is locked.""" raise NotImplementedError('Method must be implemented by subclass') def close(self): """Flush and close the mailbox.""" raise NotImplementedError('Method must be implemented by subclass') # Whether each message must end in a newline _append_newline = False def _dump_message(self, message, target, mangle_from_=False): # Most files are opened in binary mode to allow predictable seeking. # To get native line endings on disk, the user-friendly \n line endings # used in strings and by email.Message are translated here. """Dump message contents to target file.""" if isinstance(message, email.message.Message): buffer = StringIO.StringIO() gen = email.generator.Generator(buffer, mangle_from_, 0) gen.flatten(message) buffer.seek(0) data = buffer.read().replace('\n', os.linesep) target.write(data) if self._append_newline and not data.endswith(os.linesep): # Make sure the message ends with a newline target.write(os.linesep) elif isinstance(message, str): if mangle_from_: message = message.replace('\nFrom ', '\n>From ') message = message.replace('\n', os.linesep) target.write(message) if self._append_newline and not message.endswith(os.linesep): # Make sure the message ends with a newline target.write(os.linesep) elif hasattr(message, 'read'): lastline = None while True: line = message.readline() if line == '': break if mangle_from_ and line.startswith('From '): line = '>From ' + line[5:] line = line.replace('\n', os.linesep) target.write(line) lastline = line if self._append_newline and lastline and not lastline.endswith(os.linesep): # Make sure the message ends with a newline target.write(os.linesep) else: raise TypeError('Invalid message type: %s' % type(message)) class Maildir(Mailbox): """A qmail-style Maildir mailbox.""" colon = ':' def __init__(self, dirname, factory=rfc822.Message, create=True): """Initialize a Maildir instance.""" Mailbox.__init__(self, dirname, factory, create) self._paths = { 'tmp': os.path.join(self._path, 'tmp'), 'new': os.path.join(self._path, 'new'), 'cur': os.path.join(self._path, 'cur'), } if not os.path.exists(self._path): if create: os.mkdir(self._path, 0700) for path in self._paths.values(): os.mkdir(path, 0o700) else: raise NoSuchMailboxError(self._path) self._toc = {} self._toc_mtimes = {'cur': 0, 'new': 0} self._last_read = 0 # Records last time we read cur/new self._skewfactor = 0.1 # Adjust if os/fs clocks are skewing def add(self, message): """Add message and return assigned key.""" tmp_file = self._create_tmp() try: self._dump_message(message, tmp_file) except BaseException: tmp_file.close() os.remove(tmp_file.name) raise _sync_close(tmp_file) if isinstance(message, MaildirMessage): subdir = message.get_subdir() suffix = self.colon + message.get_info() if suffix == self.colon: suffix = '' else: subdir = 'new' suffix = '' uniq = os.path.basename(tmp_file.name).split(self.colon)[0] dest = os.path.join(self._path, subdir, uniq + suffix) if isinstance(message, MaildirMessage): os.utime(tmp_file.name, (os.path.getatime(tmp_file.name), message.get_date())) # No file modification should be done after the file is moved to its # final position in order to prevent race conditions with changes # from other programs try: if hasattr(os, 'link'): os.link(tmp_file.name, dest) os.remove(tmp_file.name) else: os.rename(tmp_file.name, dest) except OSError, e: os.remove(tmp_file.name) if e.errno == errno.EEXIST: raise ExternalClashError('Name clash with existing message: %s' % dest) else: raise return uniq def remove(self, key): """Remove the keyed message; raise KeyError if it doesn't exist.""" os.remove(os.path.join(self._path, self._lookup(key))) def discard(self, key): """If the keyed message exists, remove it.""" # This overrides an inapplicable implementation in the superclass. try: self.remove(key) except KeyError: pass except OSError, e: if e.errno != errno.ENOENT: raise def __setitem__(self, key, message): """Replace the keyed message; raise KeyError if it doesn't exist.""" old_subpath = self._lookup(key) temp_key = self.add(message) temp_subpath = self._lookup(temp_key) if isinstance(message, MaildirMessage): # temp's subdir and suffix were specified by message. dominant_subpath = temp_subpath else: # temp's subdir and suffix were defaults from add(). dominant_subpath = old_subpath subdir = os.path.dirname(dominant_subpath) if self.colon in dominant_subpath: suffix = self.colon + dominant_subpath.split(self.colon)[-1] else: suffix = '' self.discard(key) tmp_path = os.path.join(self._path, temp_subpath) new_path = os.path.join(self._path, subdir, key + suffix) if isinstance(message, MaildirMessage): os.utime(tmp_path, (os.path.getatime(tmp_path), message.get_date())) # No file modification should be done after the file is moved to its # final position in order to prevent race conditions with changes # from other programs os.rename(tmp_path, new_path) def get_message(self, key): """Return a Message representation or raise a KeyError.""" subpath = self._lookup(key) f = open(os.path.join(self._path, subpath), 'r') try: if self._factory: msg = self._factory(f) else: msg = MaildirMessage(f) finally: f.close() subdir, name = os.path.split(subpath) msg.set_subdir(subdir) if self.colon in name: msg.set_info(name.split(self.colon)[-1]) msg.set_date(os.path.getmtime(os.path.join(self._path, subpath))) return msg def get_string(self, key): """Return a string representation or raise a KeyError.""" f = open(os.path.join(self._path, self._lookup(key)), 'r') try: return f.read() finally: f.close() def get_file(self, key): """Return a file-like representation or raise a KeyError.""" f = open(os.path.join(self._path, self._lookup(key)), 'rb') return _ProxyFile(f) def iterkeys(self): """Return an iterator over keys.""" self._refresh() for key in self._toc: try: self._lookup(key) except KeyError: continue yield key def has_key(self, key): """Return True if the keyed message exists, False otherwise.""" self._refresh() return key in self._toc def __len__(self): """Return a count of messages in the mailbox.""" self._refresh() return len(self._toc) def flush(self): """Write any pending changes to disk.""" # Maildir changes are always written immediately, so there's nothing # to do. pass def lock(self): """Lock the mailbox.""" return def unlock(self): """Unlock the mailbox if it is locked.""" return def close(self): """Flush and close the mailbox.""" return def list_folders(self): """Return a list of folder names.""" result = [] for entry in os.listdir(self._path): if len(entry) > 1 and entry[0] == '.' and \ os.path.isdir(os.path.join(self._path, entry)): result.append(entry[1:]) return result def get_folder(self, folder): """Return a Maildir instance for the named folder.""" return Maildir(os.path.join(self._path, '.' + folder), factory=self._factory, create=False) def add_folder(self, folder): """Create a folder and return a Maildir instance representing it.""" path = os.path.join(self._path, '.' + folder) result = Maildir(path, factory=self._factory) maildirfolder_path = os.path.join(path, 'maildirfolder') if not os.path.exists(maildirfolder_path): os.close(os.open(maildirfolder_path, os.O_CREAT | os.O_WRONLY, 0666)) return result def remove_folder(self, folder): """Delete the named folder, which must be empty.""" path = os.path.join(self._path, '.' + folder) for entry in os.listdir(os.path.join(path, 'new')) + \ os.listdir(os.path.join(path, 'cur')): if len(entry) < 1 or entry[0] != '.': raise NotEmptyError('Folder contains message(s): %s' % folder) for entry in os.listdir(path): if entry != 'new' and entry != 'cur' and entry != 'tmp' and \ os.path.isdir(os.path.join(path, entry)): raise NotEmptyError("Folder contains subdirectory '%s': %s" % (folder, entry)) for root, dirs, files in os.walk(path, topdown=False): for entry in files: os.remove(os.path.join(root, entry)) for entry in dirs: os.rmdir(os.path.join(root, entry)) os.rmdir(path) def clean(self): """Delete old files in "tmp".""" now = time.time() for entry in os.listdir(os.path.join(self._path, 'tmp')): path = os.path.join(self._path, 'tmp', entry) if now - os.path.getatime(path) > 129600: # 60 * 60 * 36 os.remove(path) _count = 1 # This is used to generate unique file names. def _create_tmp(self): """Create a file in the tmp subdirectory and open and return it.""" now = time.time() hostname = socket.gethostname() if '/' in hostname: hostname = hostname.replace('/', r'\057') if ':' in hostname: hostname = hostname.replace(':', r'\072') uniq = "%s.M%sP%sQ%s.%s" % (int(now), int(now % 1 * 1e6), os.getpid(), Maildir._count, hostname) path = os.path.join(self._path, 'tmp', uniq) try: os.stat(path) except OSError, e: if e.errno == errno.ENOENT: Maildir._count += 1 try: return _create_carefully(path) except OSError, e: if e.errno != errno.EEXIST: raise else: raise # Fall through to here if stat succeeded or open raised EEXIST. raise ExternalClashError('Name clash prevented file creation: %s' % path) def _refresh(self): """Update table of contents mapping.""" # If it has been less than two seconds since the last _refresh() call, # we have to unconditionally re-read the mailbox just in case it has # been modified, because os.path.mtime() has a 2 sec resolution in the # most common worst case (FAT) and a 1 sec resolution typically. This # results in a few unnecessary re-reads when _refresh() is called # multiple times in that interval, but once the clock ticks over, we # will only re-read as needed. Because the filesystem might be being # served by an independent system with its own clock, we record and # compare with the mtimes from the filesystem. Because the other # system's clock might be skewing relative to our clock, we add an # extra delta to our wait. The default is one tenth second, but is an # instance variable and so can be adjusted if dealing with a # particularly skewed or irregular system. if time.time() - self._last_read > 2 + self._skewfactor: refresh = False for subdir in self._toc_mtimes: mtime = os.path.getmtime(self._paths[subdir]) if mtime > self._toc_mtimes[subdir]: refresh = True self._toc_mtimes[subdir] = mtime if not refresh: return # Refresh toc self._toc = {} for subdir in self._toc_mtimes: path = self._paths[subdir] for entry in os.listdir(path): p = os.path.join(path, entry) if os.path.isdir(p): continue uniq = entry.split(self.colon)[0] self._toc[uniq] = os.path.join(subdir, entry) self._last_read = time.time() def _lookup(self, key): """Use TOC to return subpath for given key, or raise a KeyError.""" try: if os.path.exists(os.path.join(self._path, self._toc[key])): return self._toc[key] except KeyError: pass self._refresh() try: return self._toc[key] except KeyError: raise KeyError('No message with key: %s' % key) # This method is for backward compatibility only. def next(self): """Return the next message in a one-time iteration.""" if not hasattr(self, '_onetime_keys'): self._onetime_keys = self.iterkeys() while True: try: return self[self._onetime_keys.next()] except StopIteration: return None except KeyError: continue class _singlefileMailbox(Mailbox): """A single-file mailbox.""" def __init__(self, path, factory=None, create=True): """Initialize a single-file mailbox.""" Mailbox.__init__(self, path, factory, create) try: f = open(self._path, 'rb+') except IOError, e: if e.errno == errno.ENOENT: if create: f = open(self._path, 'wb+') else: raise NoSuchMailboxError(self._path) elif e.errno in (errno.EACCES, errno.EROFS): f = open(self._path, 'rb') else: raise self._file = f self._toc = None self._next_key = 0 self._pending = False # No changes require rewriting the file. self._pending_sync = False # No need to sync the file self._locked = False self._file_length = None # Used to record mailbox size def add(self, message): """Add message and return assigned key.""" self._lookup() self._toc[self._next_key] = self._append_message(message) self._next_key += 1 # _append_message appends the message to the mailbox file. We # don't need a full rewrite + rename, sync is enough. self._pending_sync = True return self._next_key - 1 def remove(self, key): """Remove the keyed message; raise KeyError if it doesn't exist.""" self._lookup(key) del self._toc[key] self._pending = True def __setitem__(self, key, message): """Replace the keyed message; raise KeyError if it doesn't exist.""" self._lookup(key) self._toc[key] = self._append_message(message) self._pending = True def iterkeys(self): """Return an iterator over keys.""" self._lookup() for key in self._toc.keys(): yield key def has_key(self, key): """Return True if the keyed message exists, False otherwise.""" self._lookup() return key in self._toc def __len__(self): """Return a count of messages in the mailbox.""" self._lookup() return len(self._toc) def lock(self): """Lock the mailbox.""" if not self._locked: _lock_file(self._file) self._locked = True def unlock(self): """Unlock the mailbox if it is locked.""" if self._locked: _unlock_file(self._file) self._locked = False def flush(self): """Write any pending changes to disk.""" if not self._pending: if self._pending_sync: # Messages have only been added, so syncing the file # is enough. _sync_flush(self._file) self._pending_sync = False return # In order to be writing anything out at all, self._toc must # already have been generated (and presumably has been modified # by adding or deleting an item). assert self._toc is not None # Check length of self._file; if it's changed, some other process # has modified the mailbox since we scanned it. self._file.seek(0, 2) cur_len = self._file.tell() if cur_len != self._file_length: raise ExternalClashError('Size of mailbox file changed ' '(expected %i, found %i)' % (self._file_length, cur_len)) new_file = _create_temporary(self._path) try: new_toc = {} self._pre_mailbox_hook(new_file) for key in sorted(self._toc.keys()): start, stop = self._toc[key] self._file.seek(start) self._pre_message_hook(new_file) new_start = new_file.tell() while True: buffer = self._file.read(min(4096, stop - self._file.tell())) if buffer == '': break new_file.write(buffer) new_toc[key] = (new_start, new_file.tell()) self._post_message_hook(new_file) self._file_length = new_file.tell() except: new_file.close() os.remove(new_file.name) raise _sync_close(new_file) # self._file is about to get replaced, so no need to sync. self._file.close() # Make sure the new file's mode is the same as the old file's mode = os.stat(self._path).st_mode os.chmod(new_file.name, mode) try: os.rename(new_file.name, self._path) except OSError, e: if e.errno == errno.EEXIST or \ (os.name == 'os2' and e.errno == errno.EACCES): os.remove(self._path) os.rename(new_file.name, self._path) else: raise self._file = open(self._path, 'rb+') self._toc = new_toc self._pending = False self._pending_sync = False if self._locked: _lock_file(self._file, dotlock=False) def _pre_mailbox_hook(self, f): """Called before writing the mailbox to file f.""" return def _pre_message_hook(self, f): """Called before writing each message to file f.""" return def _post_message_hook(self, f): """Called after writing each message to file f.""" return def close(self): """Flush and close the mailbox.""" try: self.flush() finally: try: if self._locked: self.unlock() finally: self._file.close() # Sync has been done by self.flush() above. def _lookup(self, key=None): """Return (start, stop) or raise KeyError.""" if self._toc is None: self._generate_toc() if key is not None: try: return self._toc[key] except KeyError: raise KeyError('No message with key: %s' % key) def _append_message(self, message): """Append message to mailbox and return (start, stop) offsets.""" self._file.seek(0, 2) before = self._file.tell() if len(self._toc) == 0 and not self._pending: # This is the first message, and the _pre_mailbox_hook # hasn't yet been called. If self._pending is True, # messages have been removed, so _pre_mailbox_hook must # have been called already. self._pre_mailbox_hook(self._file) try: self._pre_message_hook(self._file) offsets = self._install_message(message) self._post_message_hook(self._file) except BaseException: self._file.truncate(before) raise self._file.flush() self._file_length = self._file.tell() # Record current length of mailbox return offsets class _mboxMMDF(_singlefileMailbox): """An mbox or MMDF mailbox.""" _mangle_from_ = True def get_message(self, key): """Return a Message representation or raise a KeyError.""" start, stop = self._lookup(key) self._file.seek(start) from_line = self._file.readline().replace(os.linesep, '') string = self._file.read(stop - self._file.tell()) msg = self._message_factory(string.replace(os.linesep, '\n')) msg.set_from(from_line[5:]) return msg def get_string(self, key, from_=False): """Return a string representation or raise a KeyError.""" start, stop = self._lookup(key) self._file.seek(start) if not from_: self._file.readline() string = self._file.read(stop - self._file.tell()) return string.replace(os.linesep, '\n') def get_file(self, key, from_=False): """Return a file-like representation or raise a KeyError.""" start, stop = self._lookup(key) self._file.seek(start) if not from_: self._file.readline() return _PartialFile(self._file, self._file.tell(), stop) def _install_message(self, message): """Format a message and blindly write to self._file.""" from_line = None if isinstance(message, str) and message.startswith('From '): newline = message.find('\n') if newline != -1: from_line = message[:newline] message = message[newline + 1:] else: from_line = message message = '' elif isinstance(message, _mboxMMDFMessage): from_line = 'From ' + message.get_from() elif isinstance(message, email.message.Message): from_line = message.get_unixfrom() # May be None. if from_line is None: from_line = 'From MAILER-DAEMON %s' % time.asctime(time.gmtime()) start = self._file.tell() self._file.write(from_line + os.linesep) self._dump_message(message, self._file, self._mangle_from_) stop = self._file.tell() return (start, stop) class mbox(_mboxMMDF): """A classic mbox mailbox.""" _mangle_from_ = True # All messages must end in a newline character, and # _post_message_hooks outputs an empty line between messages. _append_newline = True def __init__(self, path, factory=None, create=True): """Initialize an mbox mailbox.""" self._message_factory = mboxMessage _mboxMMDF.__init__(self, path, factory, create) def _post_message_hook(self, f): """Called after writing each message to file f.""" f.write(os.linesep) def _generate_toc(self): """Generate key-to-(start, stop) table of contents.""" starts, stops = [], [] last_was_empty = False self._file.seek(0) while True: line_pos = self._file.tell() line = self._file.readline() if line.startswith('From '): if len(stops) < len(starts): if last_was_empty: stops.append(line_pos - len(os.linesep)) else: # The last line before the "From " line wasn't # blank, but we consider it a start of a # message anyway. stops.append(line_pos) starts.append(line_pos) last_was_empty = False elif not line: if last_was_empty: stops.append(line_pos - len(os.linesep)) else: stops.append(line_pos) break elif line == os.linesep: last_was_empty = True else: last_was_empty = False self._toc = dict(enumerate(zip(starts, stops))) self._next_key = len(self._toc) self._file_length = self._file.tell() class MMDF(_mboxMMDF): """An MMDF mailbox.""" def __init__(self, path, factory=None, create=True): """Initialize an MMDF mailbox.""" self._message_factory = MMDFMessage _mboxMMDF.__init__(self, path, factory, create) def _pre_message_hook(self, f): """Called before writing each message to file f.""" f.write('\001\001\001\001' + os.linesep) def _post_message_hook(self, f): """Called after writing each message to file f.""" f.write(os.linesep + '\001\001\001\001' + os.linesep) def _generate_toc(self): """Generate key-to-(start, stop) table of contents.""" starts, stops = [], [] self._file.seek(0) next_pos = 0 while True: line_pos = next_pos line = self._file.readline() next_pos = self._file.tell() if line.startswith('\001\001\001\001' + os.linesep): starts.append(next_pos) while True: line_pos = next_pos line = self._file.readline() next_pos = self._file.tell() if line == '\001\001\001\001' + os.linesep: stops.append(line_pos - len(os.linesep)) break elif line == '': stops.append(line_pos) break elif line == '': break self._toc = dict(enumerate(zip(starts, stops))) self._next_key = len(self._toc) self._file.seek(0, 2) self._file_length = self._file.tell() class MH(Mailbox): """An MH mailbox.""" def __init__(self, path, factory=None, create=True): """Initialize an MH instance.""" Mailbox.__init__(self, path, factory, create) if not os.path.exists(self._path): if create: os.mkdir(self._path, 0700) os.close(os.open(os.path.join(self._path, '.mh_sequences'), os.O_CREAT | os.O_EXCL | os.O_WRONLY, 0600)) else: raise NoSuchMailboxError(self._path) self._locked = False def add(self, message): """Add message and return assigned key.""" keys = self.keys() if len(keys) == 0: new_key = 1 else: new_key = max(keys) + 1 new_path = os.path.join(self._path, str(new_key)) f = _create_carefully(new_path) closed = False try: if self._locked: _lock_file(f) try: try: self._dump_message(message, f) except BaseException: # Unlock and close so it can be deleted on Windows if self._locked: _unlock_file(f) _sync_close(f) closed = True os.remove(new_path) raise if isinstance(message, MHMessage): self._dump_sequences(message, new_key) finally: if self._locked: _unlock_file(f) finally: if not closed: _sync_close(f) return new_key def remove(self, key): """Remove the keyed message; raise KeyError if it doesn't exist.""" path = os.path.join(self._path, str(key)) try: f = open(path, 'rb+') except IOError, e: if e.errno == errno.ENOENT: raise KeyError('No message with key: %s' % key) else: raise else: f.close() os.remove(path) def __setitem__(self, key, message): """Replace the keyed message; raise KeyError if it doesn't exist.""" path = os.path.join(self._path, str(key)) try: f = open(path, 'rb+') except IOError, e: if e.errno == errno.ENOENT: raise KeyError('No message with key: %s' % key) else: raise try: if self._locked: _lock_file(f) try: os.close(os.open(path, os.O_WRONLY | os.O_TRUNC)) self._dump_message(message, f) if isinstance(message, MHMessage): self._dump_sequences(message, key) finally: if self._locked: _unlock_file(f) finally: _sync_close(f) def get_message(self, key): """Return a Message representation or raise a KeyError.""" try: if self._locked: f = open(os.path.join(self._path, str(key)), 'r+') else: f = open(os.path.join(self._path, str(key)), 'r') except IOError, e: if e.errno == errno.ENOENT: raise KeyError('No message with key: %s' % key) else: raise try: if self._locked: _lock_file(f) try: msg = MHMessage(f) finally: if self._locked: _unlock_file(f) finally: f.close() for name, key_list in self.get_sequences().iteritems(): if key in key_list: msg.add_sequence(name) return msg def get_string(self, key): """Return a string representation or raise a KeyError.""" try: if self._locked: f = open(os.path.join(self._path, str(key)), 'r+') else: f = open(os.path.join(self._path, str(key)), 'r') except IOError, e: if e.errno == errno.ENOENT: raise KeyError('No message with key: %s' % key) else: raise try: if self._locked: _lock_file(f) try: return f.read() finally: if self._locked: _unlock_file(f) finally: f.close() def get_file(self, key): """Return a file-like representation or raise a KeyError.""" try: f = open(os.path.join(self._path, str(key)), 'rb') except IOError, e: if e.errno == errno.ENOENT: raise KeyError('No message with key: %s' % key) else: raise return _ProxyFile(f) def iterkeys(self): """Return an iterator over keys.""" return iter(sorted(int(entry) for entry in os.listdir(self._path) if entry.isdigit())) def has_key(self, key): """Return True if the keyed message exists, False otherwise.""" return os.path.exists(os.path.join(self._path, str(key))) def __len__(self): """Return a count of messages in the mailbox.""" return len(list(self.iterkeys())) def lock(self): """Lock the mailbox.""" if not self._locked: self._file = open(os.path.join(self._path, '.mh_sequences'), 'rb+') _lock_file(self._file) self._locked = True def unlock(self): """Unlock the mailbox if it is locked.""" if self._locked: _unlock_file(self._file) _sync_close(self._file) del self._file self._locked = False def flush(self): """Write any pending changes to the disk.""" return def close(self): """Flush and close the mailbox.""" if self._locked: self.unlock() def list_folders(self): """Return a list of folder names.""" result = [] for entry in os.listdir(self._path): if os.path.isdir(os.path.join(self._path, entry)): result.append(entry) return result def get_folder(self, folder): """Return an MH instance for the named folder.""" return MH(os.path.join(self._path, folder), factory=self._factory, create=False) def add_folder(self, folder): """Create a folder and return an MH instance representing it.""" return MH(os.path.join(self._path, folder), factory=self._factory) def remove_folder(self, folder): """Delete the named folder, which must be empty.""" path = os.path.join(self._path, folder) entries = os.listdir(path) if entries == ['.mh_sequences']: os.remove(os.path.join(path, '.mh_sequences')) elif entries == []: pass else: raise NotEmptyError('Folder not empty: %s' % self._path) os.rmdir(path) def get_sequences(self): """Return a name-to-key-list dictionary to define each sequence.""" results = {} f = open(os.path.join(self._path, '.mh_sequences'), 'r') try: all_keys = set(self.keys()) for line in f: try: name, contents = line.split(':') keys = set() for spec in contents.split(): if spec.isdigit(): keys.add(int(spec)) else: start, stop = (int(x) for x in spec.split('-')) keys.update(range(start, stop + 1)) results[name] = [key for key in sorted(keys) \ if key in all_keys] if len(results[name]) == 0: del results[name] except ValueError: raise FormatError('Invalid sequence specification: %s' % line.rstrip()) finally: f.close() return results def set_sequences(self, sequences): """Set sequences using the given name-to-key-list dictionary.""" f = open(os.path.join(self._path, '.mh_sequences'), 'r+') try: os.close(os.open(f.name, os.O_WRONLY | os.O_TRUNC)) for name, keys in sequences.iteritems(): if len(keys) == 0: continue f.write('%s:' % name) prev = None completing = False for key in sorted(set(keys)): if key - 1 == prev: if not completing: completing = True f.write('-') elif completing: completing = False f.write('%s %s' % (prev, key)) else: f.write(' %s' % key) prev = key if completing: f.write(str(prev) + '\n') else: f.write('\n') finally: _sync_close(f) def pack(self): """Re-name messages to eliminate numbering gaps. Invalidates keys.""" sequences = self.get_sequences() prev = 0 changes = [] for key in self.iterkeys(): if key - 1 != prev: changes.append((key, prev + 1)) if hasattr(os, 'link'): os.link(os.path.join(self._path, str(key)), os.path.join(self._path, str(prev + 1))) os.unlink(os.path.join(self._path, str(key))) else: os.rename(os.path.join(self._path, str(key)), os.path.join(self._path, str(prev + 1))) prev += 1 self._next_key = prev + 1 if len(changes) == 0: return for name, key_list in sequences.items(): for old, new in changes: if old in key_list: key_list[key_list.index(old)] = new self.set_sequences(sequences) def _dump_sequences(self, message, key): """Inspect a new MHMessage and update sequences appropriately.""" pending_sequences = message.get_sequences() all_sequences = self.get_sequences() for name, key_list in all_sequences.iteritems(): if name in pending_sequences: key_list.append(key) elif key in key_list: del key_list[key_list.index(key)] for sequence in pending_sequences: if sequence not in all_sequences: all_sequences[sequence] = [key] self.set_sequences(all_sequences) class Babyl(_singlefileMailbox): """An Rmail-style Babyl mailbox.""" _special_labels = frozenset(('unseen', 'deleted', 'filed', 'answered', 'forwarded', 'edited', 'resent')) def __init__(self, path, factory=None, create=True): """Initialize a Babyl mailbox.""" _singlefileMailbox.__init__(self, path, factory, create) self._labels = {} def add(self, message): """Add message and return assigned key.""" key = _singlefileMailbox.add(self, message) if isinstance(message, BabylMessage): self._labels[key] = message.get_labels() return key def remove(self, key): """Remove the keyed message; raise KeyError if it doesn't exist.""" _singlefileMailbox.remove(self, key) if key in self._labels: del self._labels[key] def __setitem__(self, key, message): """Replace the keyed message; raise KeyError if it doesn't exist.""" _singlefileMailbox.__setitem__(self, key, message) if isinstance(message, BabylMessage): self._labels[key] = message.get_labels() def get_message(self, key): """Return a Message representation or raise a KeyError.""" start, stop = self._lookup(key) self._file.seek(start) self._file.readline() # Skip '1,' line specifying labels. original_headers = StringIO.StringIO() while True: line = self._file.readline() if line == '*** EOOH ***' + os.linesep or line == '': break original_headers.write(line.replace(os.linesep, '\n')) visible_headers = StringIO.StringIO() while True: line = self._file.readline() if line == os.linesep or line == '': break visible_headers.write(line.replace(os.linesep, '\n')) body = self._file.read(stop - self._file.tell()).replace(os.linesep, '\n') msg = BabylMessage(original_headers.getvalue() + body) msg.set_visible(visible_headers.getvalue()) if key in self._labels: msg.set_labels(self._labels[key]) return msg def get_string(self, key): """Return a string representation or raise a KeyError.""" start, stop = self._lookup(key) self._file.seek(start) self._file.readline() # Skip '1,' line specifying labels. original_headers = StringIO.StringIO() while True: line = self._file.readline() if line == '*** EOOH ***' + os.linesep or line == '': break original_headers.write(line.replace(os.linesep, '\n')) while True: line = self._file.readline() if line == os.linesep or line == '': break return original_headers.getvalue() + \ self._file.read(stop - self._file.tell()).replace(os.linesep, '\n') def get_file(self, key): """Return a file-like representation or raise a KeyError.""" return StringIO.StringIO(self.get_string(key).replace('\n', os.linesep)) def get_labels(self): """Return a list of user-defined labels in the mailbox.""" self._lookup() labels = set() for label_list in self._labels.values(): labels.update(label_list) labels.difference_update(self._special_labels) return list(labels) def _generate_toc(self): """Generate key-to-(start, stop) table of contents.""" starts, stops = [], [] self._file.seek(0) next_pos = 0 label_lists = [] while True: line_pos = next_pos line = self._file.readline() next_pos = self._file.tell() if line == '\037\014' + os.linesep: if len(stops) < len(starts): stops.append(line_pos - len(os.linesep)) starts.append(next_pos) labels = [label.strip() for label in self._file.readline()[1:].split(',') if label.strip() != ''] label_lists.append(labels) elif line == '\037' or line == '\037' + os.linesep: if len(stops) < len(starts): stops.append(line_pos - len(os.linesep)) elif line == '': stops.append(line_pos - len(os.linesep)) break self._toc = dict(enumerate(zip(starts, stops))) self._labels = dict(enumerate(label_lists)) self._next_key = len(self._toc) self._file.seek(0, 2) self._file_length = self._file.tell() def _pre_mailbox_hook(self, f): """Called before writing the mailbox to file f.""" f.write('BABYL OPTIONS:%sVersion: 5%sLabels:%s%s\037' % (os.linesep, os.linesep, ','.join(self.get_labels()), os.linesep)) def _pre_message_hook(self, f): """Called before writing each message to file f.""" f.write('\014' + os.linesep) def _post_message_hook(self, f): """Called after writing each message to file f.""" f.write(os.linesep + '\037') def _install_message(self, message): """Write message contents and return (start, stop).""" start = self._file.tell() if isinstance(message, BabylMessage): special_labels = [] labels = [] for label in message.get_labels(): if label in self._special_labels: special_labels.append(label) else: labels.append(label) self._file.write('1') for label in special_labels: self._file.write(', ' + label) self._file.write(',,') for label in labels: self._file.write(' ' + label + ',') self._file.write(os.linesep) else: self._file.write('1,,' + os.linesep) if isinstance(message, email.message.Message): orig_buffer = StringIO.StringIO() orig_generator = email.generator.Generator(orig_buffer, False, 0) orig_generator.flatten(message) orig_buffer.seek(0) while True: line = orig_buffer.readline() self._file.write(line.replace('\n', os.linesep)) if line == '\n' or line == '': break self._file.write('*** EOOH ***' + os.linesep) if isinstance(message, BabylMessage): vis_buffer = StringIO.StringIO() vis_generator = email.generator.Generator(vis_buffer, False, 0) vis_generator.flatten(message.get_visible()) while True: line = vis_buffer.readline() self._file.write(line.replace('\n', os.linesep)) if line == '\n' or line == '': break else: orig_buffer.seek(0) while True: line = orig_buffer.readline() self._file.write(line.replace('\n', os.linesep)) if line == '\n' or line == '': break while True: buffer = orig_buffer.read(4096) # Buffer size is arbitrary. if buffer == '': break self._file.write(buffer.replace('\n', os.linesep)) elif isinstance(message, str): body_start = message.find('\n\n') + 2 if body_start - 2 != -1: self._file.write(message[:body_start].replace('\n', os.linesep)) self._file.write('*** EOOH ***' + os.linesep) self._file.write(message[:body_start].replace('\n', os.linesep)) self._file.write(message[body_start:].replace('\n', os.linesep)) else: self._file.write('*** EOOH ***' + os.linesep + os.linesep) self._file.write(message.replace('\n', os.linesep)) elif hasattr(message, 'readline'): original_pos = message.tell() first_pass = True while True: line = message.readline() self._file.write(line.replace('\n', os.linesep)) if line == '\n' or line == '': if first_pass: first_pass = False self._file.write('*** EOOH ***' + os.linesep) message.seek(original_pos) else: break while True: buffer = message.read(4096) # Buffer size is arbitrary. if buffer == '': break self._file.write(buffer.replace('\n', os.linesep)) else: raise TypeError('Invalid message type: %s' % type(message)) stop = self._file.tell() return (start, stop) class Message(email.message.Message): """Message with mailbox-format-specific properties.""" def __init__(self, message=None): """Initialize a Message instance.""" if isinstance(message, email.message.Message): self._become_message(copy.deepcopy(message)) if isinstance(message, Message): message._explain_to(self) elif isinstance(message, str): self._become_message(email.message_from_string(message)) elif hasattr(message, "read"): self._become_message(email.message_from_file(message)) elif message is None: email.message.Message.__init__(self) else: raise TypeError('Invalid message type: %s' % type(message)) def _become_message(self, message): """Assume the non-format-specific state of message.""" for name in ('_headers', '_unixfrom', '_payload', '_charset', 'preamble', 'epilogue', 'defects', '_default_type'): self.__dict__[name] = message.__dict__[name] def _explain_to(self, message): """Copy format-specific state to message insofar as possible.""" if isinstance(message, Message): return # There's nothing format-specific to explain. else: raise TypeError('Cannot convert to specified type') class MaildirMessage(Message): """Message with Maildir-specific properties.""" def __init__(self, message=None): """Initialize a MaildirMessage instance.""" self._subdir = 'new' self._info = '' self._date = time.time() Message.__init__(self, message) def get_subdir(self): """Return 'new' or 'cur'.""" return self._subdir def set_subdir(self, subdir): """Set subdir to 'new' or 'cur'.""" if subdir == 'new' or subdir == 'cur': self._subdir = subdir else: raise ValueError("subdir must be 'new' or 'cur': %s" % subdir) def get_flags(self): """Return as a string the flags that are set.""" if self._info.startswith('2,'): return self._info[2:] else: return '' def set_flags(self, flags): """Set the given flags and unset all others.""" self._info = '2,' + ''.join(sorted(flags)) def add_flag(self, flag): """Set the given flag(s) without changing others.""" self.set_flags(''.join(set(self.get_flags()) | set(flag))) def remove_flag(self, flag): """Unset the given string flag(s) without changing others.""" if self.get_flags() != '': self.set_flags(''.join(set(self.get_flags()) - set(flag))) def get_date(self): """Return delivery date of message, in seconds since the epoch.""" return self._date def set_date(self, date): """Set delivery date of message, in seconds since the epoch.""" try: self._date = float(date) except ValueError: raise TypeError("can't convert to float: %s" % date) def get_info(self): """Get the message's "info" as a string.""" return self._info def set_info(self, info): """Set the message's "info" string.""" if isinstance(info, str): self._info = info else: raise TypeError('info must be a string: %s' % type(info)) def _explain_to(self, message): """Copy Maildir-specific state to message insofar as possible.""" if isinstance(message, MaildirMessage): message.set_flags(self.get_flags()) message.set_subdir(self.get_subdir()) message.set_date(self.get_date()) elif isinstance(message, _mboxMMDFMessage): flags = set(self.get_flags()) if 'S' in flags: message.add_flag('R') if self.get_subdir() == 'cur': message.add_flag('O') if 'T' in flags: message.add_flag('D') if 'F' in flags: message.add_flag('F') if 'R' in flags: message.add_flag('A') message.set_from('MAILER-DAEMON', time.gmtime(self.get_date())) elif isinstance(message, MHMessage): flags = set(self.get_flags()) if 'S' not in flags: message.add_sequence('unseen') if 'R' in flags: message.add_sequence('replied') if 'F' in flags: message.add_sequence('flagged') elif isinstance(message, BabylMessage): flags = set(self.get_flags()) if 'S' not in flags: message.add_label('unseen') if 'T' in flags: message.add_label('deleted') if 'R' in flags: message.add_label('answered') if 'P' in flags: message.add_label('forwarded') elif isinstance(message, Message): pass else: raise TypeError('Cannot convert to specified type: %s' % type(message)) class _mboxMMDFMessage(Message): """Message with mbox- or MMDF-specific properties.""" def __init__(self, message=None): """Initialize an mboxMMDFMessage instance.""" self.set_from('MAILER-DAEMON', True) if isinstance(message, email.message.Message): unixfrom = message.get_unixfrom() if unixfrom is not None and unixfrom.startswith('From '): self.set_from(unixfrom[5:]) Message.__init__(self, message) def get_from(self): """Return contents of "From " line.""" return self._from def set_from(self, from_, time_=None): """Set "From " line, formatting and appending time_ if specified.""" if time_ is not None: if time_ is True: time_ = time.gmtime() from_ += ' ' + time.asctime(time_) self._from = from_ def get_flags(self): """Return as a string the flags that are set.""" return self.get('Status', '') + self.get('X-Status', '') def set_flags(self, flags): """Set the given flags and unset all others.""" flags = set(flags) status_flags, xstatus_flags = '', '' for flag in ('R', 'O'): if flag in flags: status_flags += flag flags.remove(flag) for flag in ('D', 'F', 'A'): if flag in flags: xstatus_flags += flag flags.remove(flag) xstatus_flags += ''.join(sorted(flags)) try: self.replace_header('Status', status_flags) except KeyError: self.add_header('Status', status_flags) try: self.replace_header('X-Status', xstatus_flags) except KeyError: self.add_header('X-Status', xstatus_flags) def add_flag(self, flag): """Set the given flag(s) without changing others.""" self.set_flags(''.join(set(self.get_flags()) | set(flag))) def remove_flag(self, flag): """Unset the given string flag(s) without changing others.""" if 'Status' in self or 'X-Status' in self: self.set_flags(''.join(set(self.get_flags()) - set(flag))) def _explain_to(self, message): """Copy mbox- or MMDF-specific state to message insofar as possible.""" if isinstance(message, MaildirMessage): flags = set(self.get_flags()) if 'O' in flags: message.set_subdir('cur') if 'F' in flags: message.add_flag('F') if 'A' in flags: message.add_flag('R') if 'R' in flags: message.add_flag('S') if 'D' in flags: message.add_flag('T') del message['status'] del message['x-status'] maybe_date = ' '.join(self.get_from().split()[-5:]) try: message.set_date(calendar.timegm(time.strptime(maybe_date, '%a %b %d %H:%M:%S %Y'))) except (ValueError, OverflowError): pass elif isinstance(message, _mboxMMDFMessage): message.set_flags(self.get_flags()) message.set_from(self.get_from()) elif isinstance(message, MHMessage): flags = set(self.get_flags()) if 'R' not in flags: message.add_sequence('unseen') if 'A' in flags: message.add_sequence('replied') if 'F' in flags: message.add_sequence('flagged') del message['status'] del message['x-status'] elif isinstance(message, BabylMessage): flags = set(self.get_flags()) if 'R' not in flags: message.add_label('unseen') if 'D' in flags: message.add_label('deleted') if 'A' in flags: message.add_label('answered') del message['status'] del message['x-status'] elif isinstance(message, Message): pass else: raise TypeError('Cannot convert to specified type: %s' % type(message)) class mboxMessage(_mboxMMDFMessage): """Message with mbox-specific properties.""" class MHMessage(Message): """Message with MH-specific properties.""" def __init__(self, message=None): """Initialize an MHMessage instance.""" self._sequences = [] Message.__init__(self, message) def get_sequences(self): """Return a list of sequences that include the message.""" return self._sequences[:] def set_sequences(self, sequences): """Set the list of sequences that include the message.""" self._sequences = list(sequences) def add_sequence(self, sequence): """Add sequence to list of sequences including the message.""" if isinstance(sequence, str): if not sequence in self._sequences: self._sequences.append(sequence) else: raise TypeError('sequence must be a string: %s' % type(sequence)) def remove_sequence(self, sequence): """Remove sequence from the list of sequences including the message.""" try: self._sequences.remove(sequence) except ValueError: pass def _explain_to(self, message): """Copy MH-specific state to message insofar as possible.""" if isinstance(message, MaildirMessage): sequences = set(self.get_sequences()) if 'unseen' in sequences: message.set_subdir('cur') else: message.set_subdir('cur') message.add_flag('S') if 'flagged' in sequences: message.add_flag('F') if 'replied' in sequences: message.add_flag('R') elif isinstance(message, _mboxMMDFMessage): sequences = set(self.get_sequences()) if 'unseen' not in sequences: message.add_flag('RO') else: message.add_flag('O') if 'flagged' in sequences: message.add_flag('F') if 'replied' in sequences: message.add_flag('A') elif isinstance(message, MHMessage): for sequence in self.get_sequences(): message.add_sequence(sequence) elif isinstance(message, BabylMessage): sequences = set(self.get_sequences()) if 'unseen' in sequences: message.add_label('unseen') if 'replied' in sequences: message.add_label('answered') elif isinstance(message, Message): pass else: raise TypeError('Cannot convert to specified type: %s' % type(message)) class BabylMessage(Message): """Message with Babyl-specific properties.""" def __init__(self, message=None): """Initialize a BabylMessage instance.""" self._labels = [] self._visible = Message() Message.__init__(self, message) def get_labels(self): """Return a list of labels on the message.""" return self._labels[:] def set_labels(self, labels): """Set the list of labels on the message.""" self._labels = list(labels) def add_label(self, label): """Add label to list of labels on the message.""" if isinstance(label, str): if label not in self._labels: self._labels.append(label) else: raise TypeError('label must be a string: %s' % type(label)) def remove_label(self, label): """Remove label from the list of labels on the message.""" try: self._labels.remove(label) except ValueError: pass def get_visible(self): """Return a Message representation of visible headers.""" return Message(self._visible) def set_visible(self, visible): """Set the Message representation of visible headers.""" self._visible = Message(visible) def update_visible(self): """Update and/or sensibly generate a set of visible headers.""" for header in self._visible.keys(): if header in self: self._visible.replace_header(header, self[header]) else: del self._visible[header] for header in ('Date', 'From', 'Reply-To', 'To', 'CC', 'Subject'): if header in self and header not in self._visible: self._visible[header] = self[header] def _explain_to(self, message): """Copy Babyl-specific state to message insofar as possible.""" if isinstance(message, MaildirMessage): labels = set(self.get_labels()) if 'unseen' in labels: message.set_subdir('cur') else: message.set_subdir('cur') message.add_flag('S') if 'forwarded' in labels or 'resent' in labels: message.add_flag('P') if 'answered' in labels: message.add_flag('R') if 'deleted' in labels: message.add_flag('T') elif isinstance(message, _mboxMMDFMessage): labels = set(self.get_labels()) if 'unseen' not in labels: message.add_flag('RO') else: message.add_flag('O') if 'deleted' in labels: message.add_flag('D') if 'answered' in labels: message.add_flag('A') elif isinstance(message, MHMessage): labels = set(self.get_labels()) if 'unseen' in labels: message.add_sequence('unseen') if 'answered' in labels: message.add_sequence('replied') elif isinstance(message, BabylMessage): message.set_visible(self.get_visible()) for label in self.get_labels(): message.add_label(label) elif isinstance(message, Message): pass else: raise TypeError('Cannot convert to specified type: %s' % type(message)) class MMDFMessage(_mboxMMDFMessage): """Message with MMDF-specific properties.""" class _ProxyFile: """A read-only wrapper of a file.""" def __init__(self, f, pos=None): """Initialize a _ProxyFile.""" self._file = f if pos is None: self._pos = f.tell() else: self._pos = pos def read(self, size=None): """Read bytes.""" return self._read(size, self._file.read) def readline(self, size=None): """Read a line.""" return self._read(size, self._file.readline) def readlines(self, sizehint=None): """Read multiple lines.""" result = [] for line in self: result.append(line) if sizehint is not None: sizehint -= len(line) if sizehint <= 0: break return result def __iter__(self): """Iterate over lines.""" return iter(self.readline, "") def tell(self): """Return the position.""" return self._pos def seek(self, offset, whence=0): """Change position.""" if whence == 1: self._file.seek(self._pos) self._file.seek(offset, whence) self._pos = self._file.tell() def close(self): """Close the file.""" if hasattr(self, '_file'): if hasattr(self._file, 'close'): self._file.close() del self._file def _read(self, size, read_method): """Read size bytes using read_method.""" if size is None: size = -1 self._file.seek(self._pos) result = read_method(size) self._pos = self._file.tell() return result class _PartialFile(_ProxyFile): """A read-only wrapper of part of a file.""" def __init__(self, f, start=None, stop=None): """Initialize a _PartialFile.""" _ProxyFile.__init__(self, f, start) self._start = start self._stop = stop def tell(self): """Return the position with respect to start.""" return _ProxyFile.tell(self) - self._start def seek(self, offset, whence=0): """Change position, possibly with respect to start or stop.""" if whence == 0: self._pos = self._start whence = 1 elif whence == 2: self._pos = self._stop whence = 1 _ProxyFile.seek(self, offset, whence) def _read(self, size, read_method): """Read size bytes using read_method, honoring start and stop.""" remaining = self._stop - self._pos if remaining <= 0: return '' if size is None or size < 0 or size > remaining: size = remaining return _ProxyFile._read(self, size, read_method) def close(self): # do *not* close the underlying file object for partial files, # since it's global to the mailbox object if hasattr(self, '_file'): del self._file def _lock_file(f, dotlock=True): """Lock file f using lockf and dot locking.""" dotlock_done = False try: if fcntl: try: fcntl.lockf(f, fcntl.LOCK_EX | fcntl.LOCK_NB) except IOError, e: if e.errno in (errno.EAGAIN, errno.EACCES, errno.EROFS): raise ExternalClashError('lockf: lock unavailable: %s' % f.name) else: raise if dotlock: try: pre_lock = _create_temporary(f.name + '.lock') pre_lock.close() except IOError, e: if e.errno in (errno.EACCES, errno.EROFS): return # Without write access, just skip dotlocking. else: raise try: if hasattr(os, 'link'): os.link(pre_lock.name, f.name + '.lock') dotlock_done = True os.unlink(pre_lock.name) else: os.rename(pre_lock.name, f.name + '.lock') dotlock_done = True except OSError, e: if e.errno == errno.EEXIST or \ (os.name == 'os2' and e.errno == errno.EACCES): os.remove(pre_lock.name) raise ExternalClashError('dot lock unavailable: %s' % f.name) else: raise except: if fcntl: fcntl.lockf(f, fcntl.LOCK_UN) if dotlock_done: os.remove(f.name + '.lock') raise def _unlock_file(f): """Unlock file f using lockf and dot locking.""" if fcntl: fcntl.lockf(f, fcntl.LOCK_UN) if os.path.exists(f.name + '.lock'): os.remove(f.name + '.lock') def _create_carefully(path): """Create a file if it doesn't exist and open for reading and writing.""" fd = os.open(path, os.O_CREAT | os.O_EXCL | os.O_RDWR, 0666) try: return open(path, 'rb+') finally: os.close(fd) def _create_temporary(path): """Create a temp file based on path and open for reading and writing.""" return _create_carefully('%s.%s.%s.%s' % (path, int(time.time()), socket.gethostname(), os.getpid())) def _sync_flush(f): """Ensure changes to file f are physically on disk.""" f.flush() if hasattr(os, 'fsync'): os.fsync(f.fileno()) def _sync_close(f): """Close file f, ensuring all changes are physically on disk.""" _sync_flush(f) f.close() ## Start: classes from the original module (for backward compatibility). # Note that the Maildir class, whose name is unchanged, itself offers a next() # method for backward compatibility. class _Mailbox: def __init__(self, fp, factory=rfc822.Message): self.fp = fp self.seekp = 0 self.factory = factory def __iter__(self): return iter(self.next, None) def next(self): while 1: self.fp.seek(self.seekp) try: self._search_start() except EOFError: self.seekp = self.fp.tell() return None start = self.fp.tell() self._search_end() self.seekp = stop = self.fp.tell() if start != stop: break return self.factory(_PartialFile(self.fp, start, stop)) # Recommended to use PortableUnixMailbox instead! class UnixMailbox(_Mailbox): def _search_start(self): while 1: pos = self.fp.tell() line = self.fp.readline() if not line: raise EOFError if line[:5] == 'From ' and self._isrealfromline(line): self.fp.seek(pos) return def _search_end(self): self.fp.readline() # Throw away header line while 1: pos = self.fp.tell() line = self.fp.readline() if not line: return if line[:5] == 'From ' and self._isrealfromline(line): self.fp.seek(pos) return # An overridable mechanism to test for From-line-ness. You can either # specify a different regular expression or define a whole new # _isrealfromline() method. Note that this only gets called for lines # starting with the 5 characters "From ". # # BAW: According to #http://home.netscape.com/eng/mozilla/2.0/relnotes/demo/content-length.html # the only portable, reliable way to find message delimiters in a BSD (i.e # Unix mailbox) style folder is to search for "\n\nFrom .*\n", or at the # beginning of the file, "^From .*\n". While _fromlinepattern below seems # like a good idea, in practice, there are too many variations for more # strict parsing of the line to be completely accurate. # # _strict_isrealfromline() is the old version which tries to do stricter # parsing of the From_ line. _portable_isrealfromline() simply returns # true, since it's never called if the line doesn't already start with # "From ". # # This algorithm, and the way it interacts with _search_start() and # _search_end() may not be completely correct, because it doesn't check # that the two characters preceding "From " are \n\n or the beginning of # the file. Fixing this would require a more extensive rewrite than is # necessary. For convenience, we've added a PortableUnixMailbox class # which does no checking of the format of the 'From' line. _fromlinepattern = (r"From \s*[^\s]+\s+\w\w\w\s+\w\w\w\s+\d?\d\s+" r"\d?\d:\d\d(:\d\d)?(\s+[^\s]+)?\s+\d\d\d\d\s*" r"[^\s]*\s*" "$") _regexp = None def _strict_isrealfromline(self, line): if not self._regexp: import re self._regexp = re.compile(self._fromlinepattern) return self._regexp.match(line) def _portable_isrealfromline(self, line): return True _isrealfromline = _strict_isrealfromline class PortableUnixMailbox(UnixMailbox): _isrealfromline = UnixMailbox._portable_isrealfromline class MmdfMailbox(_Mailbox): def _search_start(self): while 1: line = self.fp.readline() if not line: raise EOFError if line[:5] == '\001\001\001\001\n': return def _search_end(self): while 1: pos = self.fp.tell() line = self.fp.readline() if not line: return if line == '\001\001\001\001\n': self.fp.seek(pos) return class MHMailbox: def __init__(self, dirname, factory=rfc822.Message): import re pat = re.compile('^[1-9][0-9]*$') self.dirname = dirname # the three following lines could be combined into: # list = map(long, filter(pat.match, os.listdir(self.dirname))) list = os.listdir(self.dirname) list = filter(pat.match, list) list = map(long, list) list.sort() # This only works in Python 1.6 or later; # before that str() added 'L': self.boxes = map(str, list) self.boxes.reverse() self.factory = factory def __iter__(self): return iter(self.next, None) def next(self): if not self.boxes: return None fn = self.boxes.pop() fp = open(os.path.join(self.dirname, fn)) msg = self.factory(fp) try: msg._mh_msgno = fn except (AttributeError, TypeError): pass return msg class BabylMailbox(_Mailbox): def _search_start(self): while 1: line = self.fp.readline() if not line: raise EOFError if line == '*** EOOH ***\n': return def _search_end(self): while 1: pos = self.fp.tell() line = self.fp.readline() if not line: return if line == '\037\014\n' or line == '\037': self.fp.seek(pos) return ## End: classes from the original module (for backward compatibility). class Error(Exception): """Raised for module-specific errors.""" class NoSuchMailboxError(Error): """The specified mailbox does not exist and won't be created.""" class NotEmptyError(Error): """The specified mailbox is not empty and deletion was requested.""" class ExternalClashError(Error): """Another process caused an action to fail.""" class FormatError(Error): """A file appears to have an invalid format."""
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