mirror of
https://github.com/python/cpython.git
synced 2025-10-25 18:54:53 +00:00
2159 lines
77 KiB
Python
2159 lines
77 KiB
Python
#! /usr/bin/env python3
|
|
|
|
"""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 warnings
|
|
import email
|
|
import email.message
|
|
import email.generator
|
|
import io
|
|
import contextlib
|
|
try:
|
|
if sys.platform == 'os2emx':
|
|
# OS/2 EMX fcntl() not adequate
|
|
raise ImportError
|
|
import fcntl
|
|
except ImportError:
|
|
fcntl = None
|
|
|
|
__all__ = [ 'Mailbox', 'Maildir', 'mbox', 'MH', 'Babyl', 'MMDF',
|
|
'Message', 'MaildirMessage', 'mboxMessage', 'MHMessage',
|
|
'BabylMessage', 'MMDFMessage']
|
|
|
|
linesep = os.linesep.encode('ascii')
|
|
|
|
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:
|
|
with contextlib.closing(self.get_file(key)) as file:
|
|
return self._factory(file)
|
|
|
|
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.
|
|
|
|
Uses email.message.Message to create a 7bit clean string
|
|
representation of the message."""
|
|
return email.message_from_bytes(self.get_bytes(key)).as_string()
|
|
|
|
def get_bytes(self, key):
|
|
"""Return a byte 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.keys():
|
|
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.keys():
|
|
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 __contains__(self, key):
|
|
"""Return True if the keyed message exists, False otherwise."""
|
|
raise NotImplementedError('Method must be implemented by subclass')
|
|
|
|
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.keys():
|
|
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.keys():
|
|
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.items()
|
|
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')
|
|
|
|
def _string_to_bytes(self, message):
|
|
# If a message is not 7bit clean, we refuse to handle it since it
|
|
# likely came from reading invalid messages in text mode, and that way
|
|
# lies mojibake.
|
|
try:
|
|
return message.encode('ascii')
|
|
except UnicodeError:
|
|
raise ValueError("String input must be ASCII-only; "
|
|
"use bytes or a Message instead")
|
|
|
|
# Whether each message must end in a newline
|
|
_append_newline = False
|
|
|
|
def _dump_message(self, message, target, mangle_from_=False):
|
|
# This assumes the target file is open in binary mode.
|
|
"""Dump message contents to target file."""
|
|
if isinstance(message, email.message.Message):
|
|
buffer = io.BytesIO()
|
|
gen = email.generator.BytesGenerator(buffer, mangle_from_, 0)
|
|
gen.flatten(message)
|
|
buffer.seek(0)
|
|
data = buffer.read()
|
|
data = data.replace(b'\n', linesep)
|
|
target.write(data)
|
|
if self._append_newline and not data.endswith(linesep):
|
|
# Make sure the message ends with a newline
|
|
target.write(linesep)
|
|
elif isinstance(message, (str, bytes, io.StringIO)):
|
|
if isinstance(message, io.StringIO):
|
|
warnings.warn("Use of StringIO input is deprecated, "
|
|
"use BytesIO instead", DeprecationWarning, 3)
|
|
message = message.getvalue()
|
|
if isinstance(message, str):
|
|
message = self._string_to_bytes(message)
|
|
if mangle_from_:
|
|
message = message.replace(b'\nFrom ', b'\n>From ')
|
|
message = message.replace(b'\n', linesep)
|
|
target.write(message)
|
|
if self._append_newline and not message.endswith(linesep):
|
|
# Make sure the message ends with a newline
|
|
target.write(linesep)
|
|
elif hasattr(message, 'read'):
|
|
if hasattr(message, 'buffer'):
|
|
warnings.warn("Use of text mode files is deprecated, "
|
|
"use a binary mode file instead", DeprecationWarning, 3)
|
|
message = message.buffer
|
|
lastline = None
|
|
while True:
|
|
line = message.readline()
|
|
# Universal newline support.
|
|
if line.endswith(b'\r\n'):
|
|
line = line[:-2] + b'\n'
|
|
elif line.endswith(b'\r'):
|
|
line = line[:-1] + b'\n'
|
|
if not line:
|
|
break
|
|
if mangle_from_ and line.startswith(b'From '):
|
|
line = b'>From ' + line[5:]
|
|
line = line.replace(b'\n', linesep)
|
|
target.write(line)
|
|
lastline = line
|
|
if self._append_newline and lastline and not lastline.endswith(linesep):
|
|
# Make sure the message ends with a newline
|
|
target.write(linesep)
|
|
else:
|
|
raise TypeError('Invalid message type: %s' % type(message))
|
|
|
|
|
|
class Maildir(Mailbox):
|
|
"""A qmail-style Maildir mailbox."""
|
|
|
|
colon = ':'
|
|
|
|
def __init__(self, dirname, factory=None, 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, 0o700)
|
|
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)
|
|
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 as e:
|
|
os.remove(tmp_file.name)
|
|
if e.errno == errno.EEXIST:
|
|
raise ExternalClashError('Name clash with existing message: %s'
|
|
% dest)
|
|
else:
|
|
raise
|
|
if isinstance(message, MaildirMessage):
|
|
os.utime(dest, (os.path.getatime(dest), message.get_date()))
|
|
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 as 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)
|
|
new_path = os.path.join(self._path, subdir, key + suffix)
|
|
os.rename(os.path.join(self._path, temp_subpath), new_path)
|
|
if isinstance(message, MaildirMessage):
|
|
os.utime(new_path, (os.path.getatime(new_path),
|
|
message.get_date()))
|
|
|
|
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), 'rb')
|
|
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_bytes(self, key):
|
|
"""Return a bytes representation or raise a KeyError."""
|
|
f = open(os.path.join(self._path, self._lookup(key)), 'rb')
|
|
try:
|
|
return f.read().replace(linesep, b'\n')
|
|
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 __contains__(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,
|
|
0o666))
|
|
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 as e:
|
|
if e.errno == errno.ENOENT:
|
|
Maildir._count += 1
|
|
try:
|
|
return _create_carefully(path)
|
|
except OSError as 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 = iter(self.keys())
|
|
while True:
|
|
try:
|
|
return self[next(self._onetime_keys)]
|
|
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 as 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()
|
|
yield from self._toc.keys()
|
|
|
|
def __contains__(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 not 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 as 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."""
|
|
self.flush()
|
|
if self._locked:
|
|
self.unlock()
|
|
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(linesep, b'')
|
|
string = self._file.read(stop - self._file.tell())
|
|
msg = self._message_factory(string.replace(linesep, b'\n'))
|
|
msg.set_from(from_line[5:].decode('ascii'))
|
|
return msg
|
|
|
|
def get_string(self, key, from_=False):
|
|
"""Return a string representation or raise a KeyError."""
|
|
return email.message_from_bytes(
|
|
self.get_bytes(key)).as_string(unixfrom=from_)
|
|
|
|
def get_bytes(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(linesep, b'\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):
|
|
message = self._string_to_bytes(message)
|
|
if isinstance(message, bytes) and message.startswith(b'From '):
|
|
newline = message.find(b'\n')
|
|
if newline != -1:
|
|
from_line = message[:newline]
|
|
message = message[newline + 1:]
|
|
else:
|
|
from_line = message
|
|
message = b''
|
|
elif isinstance(message, _mboxMMDFMessage):
|
|
author = message.get_from().encode('ascii')
|
|
from_line = b'From ' + author
|
|
elif isinstance(message, email.message.Message):
|
|
from_line = message.get_unixfrom() # May be None.
|
|
if from_line is not None:
|
|
from_line = from_line.encode('ascii')
|
|
if from_line is None:
|
|
from_line = b'From MAILER-DAEMON ' + time.asctime(time.gmtime()).encode()
|
|
start = self._file.tell()
|
|
self._file.write(from_line + 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(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(b'From '):
|
|
if len(stops) < len(starts):
|
|
if last_was_empty:
|
|
stops.append(line_pos - len(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(linesep))
|
|
else:
|
|
stops.append(line_pos)
|
|
break
|
|
elif line == 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(b'\001\001\001\001' + linesep)
|
|
|
|
def _post_message_hook(self, f):
|
|
"""Called after writing each message to file f."""
|
|
f.write(linesep + b'\001\001\001\001' + 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(b'\001\001\001\001' + linesep):
|
|
starts.append(next_pos)
|
|
while True:
|
|
line_pos = next_pos
|
|
line = self._file.readline()
|
|
next_pos = self._file.tell()
|
|
if line == b'\001\001\001\001' + linesep:
|
|
stops.append(line_pos - len(linesep))
|
|
break
|
|
elif not line:
|
|
stops.append(line_pos)
|
|
break
|
|
elif not 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, 0o700)
|
|
os.close(os.open(os.path.join(self._path, '.mh_sequences'),
|
|
os.O_CREAT | os.O_EXCL | os.O_WRONLY, 0o600))
|
|
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 as 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 as 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)), 'rb+')
|
|
else:
|
|
f = open(os.path.join(self._path, str(key)), 'rb')
|
|
except IOError as 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().items():
|
|
if key in key_list:
|
|
msg.add_sequence(name)
|
|
return msg
|
|
|
|
def get_bytes(self, key):
|
|
"""Return a bytes representation or raise a KeyError."""
|
|
try:
|
|
if self._locked:
|
|
f = open(os.path.join(self._path, str(key)), 'rb+')
|
|
else:
|
|
f = open(os.path.join(self._path, str(key)), 'rb')
|
|
except IOError as 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().replace(linesep, b'\n')
|
|
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 as 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 __contains__(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.keys()))
|
|
|
|
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 = {}
|
|
with open(os.path.join(self._path, '.mh_sequences'), 'r', encoding='ASCII') as f:
|
|
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())
|
|
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+', encoding='ASCII')
|
|
try:
|
|
os.close(os.open(f.name, os.O_WRONLY | os.O_TRUNC))
|
|
for name, keys in sequences.items():
|
|
if len(keys) == 0:
|
|
continue
|
|
f.write(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.keys():
|
|
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.items():
|
|
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 b'1,' line specifying labels.
|
|
original_headers = io.BytesIO()
|
|
while True:
|
|
line = self._file.readline()
|
|
if line == b'*** EOOH ***' + linesep or not line:
|
|
break
|
|
original_headers.write(line.replace(linesep, b'\n'))
|
|
visible_headers = io.BytesIO()
|
|
while True:
|
|
line = self._file.readline()
|
|
if line == linesep or not line:
|
|
break
|
|
visible_headers.write(line.replace(linesep, b'\n'))
|
|
# Read up to the stop, or to the end
|
|
n = stop - self._file.tell()
|
|
assert n >= 0
|
|
body = self._file.read(n)
|
|
body = body.replace(linesep, b'\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_bytes(self, key):
|
|
"""Return a string representation or raise a KeyError."""
|
|
start, stop = self._lookup(key)
|
|
self._file.seek(start)
|
|
self._file.readline() # Skip b'1,' line specifying labels.
|
|
original_headers = io.BytesIO()
|
|
while True:
|
|
line = self._file.readline()
|
|
if line == b'*** EOOH ***' + linesep or not line:
|
|
break
|
|
original_headers.write(line.replace(linesep, b'\n'))
|
|
while True:
|
|
line = self._file.readline()
|
|
if line == linesep or not line:
|
|
break
|
|
headers = original_headers.getvalue()
|
|
n = stop - self._file.tell()
|
|
assert n >= 0
|
|
data = self._file.read(n)
|
|
data = data.replace(linesep, b'\n')
|
|
return headers + data
|
|
|
|
def get_file(self, key):
|
|
"""Return a file-like representation or raise a KeyError."""
|
|
return io.BytesIO(self.get_bytes(key).replace(b'\n', 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 == b'\037\014' + linesep:
|
|
if len(stops) < len(starts):
|
|
stops.append(line_pos - len(linesep))
|
|
starts.append(next_pos)
|
|
labels = [label.strip() for label
|
|
in self._file.readline()[1:].split(b',')
|
|
if label.strip()]
|
|
label_lists.append(labels)
|
|
elif line == b'\037' or line == b'\037' + linesep:
|
|
if len(stops) < len(starts):
|
|
stops.append(line_pos - len(linesep))
|
|
elif not line:
|
|
stops.append(line_pos - len(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."""
|
|
babyl = b'BABYL OPTIONS:' + linesep
|
|
babyl += b'Version: 5' + linesep
|
|
labels = self.get_labels()
|
|
labels = (label.encode() for label in labels)
|
|
babyl += b'Labels:' + b','.join(labels) + linesep
|
|
babyl += b'\037'
|
|
f.write(babyl)
|
|
|
|
def _pre_message_hook(self, f):
|
|
"""Called before writing each message to file f."""
|
|
f.write(b'\014' + linesep)
|
|
|
|
def _post_message_hook(self, f):
|
|
"""Called after writing each message to file f."""
|
|
f.write(linesep + b'\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(b'1')
|
|
for label in special_labels:
|
|
self._file.write(b', ' + label.encode())
|
|
self._file.write(b',,')
|
|
for label in labels:
|
|
self._file.write(b' ' + label.encode() + b',')
|
|
self._file.write(linesep)
|
|
else:
|
|
self._file.write(b'1,,' + linesep)
|
|
if isinstance(message, email.message.Message):
|
|
orig_buffer = io.BytesIO()
|
|
orig_generator = email.generator.BytesGenerator(orig_buffer, False, 0)
|
|
orig_generator.flatten(message)
|
|
orig_buffer.seek(0)
|
|
while True:
|
|
line = orig_buffer.readline()
|
|
self._file.write(line.replace(b'\n', linesep))
|
|
if line == b'\n' or not line:
|
|
break
|
|
self._file.write(b'*** EOOH ***' + linesep)
|
|
if isinstance(message, BabylMessage):
|
|
vis_buffer = io.BytesIO()
|
|
vis_generator = email.generator.BytesGenerator(vis_buffer, False, 0)
|
|
vis_generator.flatten(message.get_visible())
|
|
while True:
|
|
line = vis_buffer.readline()
|
|
self._file.write(line.replace(b'\n', linesep))
|
|
if line == b'\n' or not line:
|
|
break
|
|
else:
|
|
orig_buffer.seek(0)
|
|
while True:
|
|
line = orig_buffer.readline()
|
|
self._file.write(line.replace(b'\n', linesep))
|
|
if line == b'\n' or not line:
|
|
break
|
|
while True:
|
|
buffer = orig_buffer.read(4096) # Buffer size is arbitrary.
|
|
if not buffer:
|
|
break
|
|
self._file.write(buffer.replace(b'\n', linesep))
|
|
elif isinstance(message, (bytes, str, io.StringIO)):
|
|
if isinstance(message, io.StringIO):
|
|
warnings.warn("Use of StringIO input is deprecated, "
|
|
"use BytesIO instead", DeprecationWarning, 3)
|
|
message = message.getvalue()
|
|
if isinstance(message, str):
|
|
message = self._string_to_bytes(message)
|
|
body_start = message.find(b'\n\n') + 2
|
|
if body_start - 2 != -1:
|
|
self._file.write(message[:body_start].replace(b'\n', linesep))
|
|
self._file.write(b'*** EOOH ***' + linesep)
|
|
self._file.write(message[:body_start].replace(b'\n', linesep))
|
|
self._file.write(message[body_start:].replace(b'\n', linesep))
|
|
else:
|
|
self._file.write(b'*** EOOH ***' + linesep + linesep)
|
|
self._file.write(message.replace(b'\n', linesep))
|
|
elif hasattr(message, 'readline'):
|
|
if hasattr(message, 'buffer'):
|
|
warnings.warn("Use of text mode files is deprecated, "
|
|
"use a binary mode file instead", DeprecationWarning, 3)
|
|
message = message.buffer
|
|
original_pos = message.tell()
|
|
first_pass = True
|
|
while True:
|
|
line = message.readline()
|
|
# Universal newline support.
|
|
if line.endswith(b'\r\n'):
|
|
line = line[:-2] + b'\n'
|
|
elif line.endswith(b'\r'):
|
|
line = line[:-1] + b'\n'
|
|
self._file.write(line.replace(b'\n', linesep))
|
|
if line == b'\n' or not line:
|
|
if first_pass:
|
|
first_pass = False
|
|
self._file.write(b'*** EOOH ***' + linesep)
|
|
message.seek(original_pos)
|
|
else:
|
|
break
|
|
while True:
|
|
line = message.readline()
|
|
if not line:
|
|
break
|
|
# Universal newline support.
|
|
if line.endswith(b'\r\n'):
|
|
line = line[:-2] + linesep
|
|
elif line.endswith(b'\r'):
|
|
line = line[:-1] + linesep
|
|
elif line.endswith(b'\n'):
|
|
line = line[:-1] + linesep
|
|
self._file.write(line)
|
|
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, bytes):
|
|
self._become_message(email.message_from_bytes(message))
|
|
elif isinstance(message, str):
|
|
self._become_message(email.message_from_string(message))
|
|
elif isinstance(message, io.TextIOWrapper):
|
|
self._become_message(email.message_from_file(message))
|
|
elif hasattr(message, "read"):
|
|
self._become_message(email.message_from_binary_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."""
|
|
type_specific = getattr(message, '_type_specific_attributes', [])
|
|
for name in message.__dict__:
|
|
if name not in type_specific:
|
|
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."""
|
|
|
|
_type_specific_attributes = ['_subdir', '_info', '_date']
|
|
|
|
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."""
|
|
|
|
_type_specific_attributes = ['_from']
|
|
|
|
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."""
|
|
|
|
_type_specific_attributes = ['_sequences']
|
|
|
|
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 type must be str: %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."""
|
|
|
|
_type_specific_attributes = ['_labels', '_visible']
|
|
|
|
def __init__(self, message=None):
|
|
"""Initialize an 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 read1(self, size=None):
|
|
"""Read bytes."""
|
|
return self._read(size, self._file.read1)
|
|
|
|
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."""
|
|
while True:
|
|
line = self.readline()
|
|
if not line:
|
|
raise StopIteration
|
|
yield line
|
|
|
|
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
|
|
|
|
def __enter__(self):
|
|
"""Context manager protocol support."""
|
|
return self
|
|
|
|
def __exit__(self, *exc):
|
|
self.close()
|
|
|
|
def readable(self):
|
|
return self._file.readable()
|
|
|
|
def writable(self):
|
|
return self._file.writable()
|
|
|
|
def seekable(self):
|
|
return self._file.seekable()
|
|
|
|
def flush(self):
|
|
return self._file.flush()
|
|
|
|
@property
|
|
def closed(self):
|
|
if not hasattr(self, '_file'):
|
|
return True
|
|
if not hasattr(self._file, 'closed'):
|
|
return False
|
|
return self._file.closed
|
|
|
|
|
|
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 b''
|
|
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 as 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 as 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 as 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, 0o666)
|
|
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()
|
|
|
|
|
|
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."""
|