# -*- coding: utf-8 -*-
# messages.py
# Copyright (C) 2013 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see .
"""
LeapMessage and MessageCollection.
"""
import copy
import logging
import re
import time
import threading
import StringIO
from collections import defaultdict, namedtuple
from functools import partial
from twisted.mail import imap4
from twisted.internet import defer
from twisted.python import log
from u1db import errors as u1db_errors
from zope.interface import implements
from zope.proxy import sameProxiedObjects
from leap.common.check import leap_assert, leap_assert_type
from leap.common.decorators import memoized_method
from leap.common.mail import get_email_charset
from leap.mail import walk
from leap.mail.utils import first, find_charset
from leap.mail.decorators import deferred
from leap.mail.imap.index import IndexedDB
from leap.mail.imap.fields import fields, WithMsgFields
from leap.mail.imap.memorystore import MessageDict
from leap.mail.imap.parser import MailParser, MBoxParser
from leap.mail.messageflow import IMessageConsumer
logger = logging.getLogger(__name__)
# TODO ------------------------------------------------------------
# [ ] Add ref to incoming message during add_msg
# [ ] Add linked-from info.
# [ ] Delete incoming mail only after successful write!
# [ ] Remove UID from syncable db. Store only those indexes locally.
# XXX no longer needed, since i'm using proxies instead of direct weakrefs
def maybe_call(thing):
"""
Return the same thing, or the result of its invocation if it is a callable.
"""
return thing() if callable(thing) else thing
def lowerdict(_dict):
"""
Return a dict with the keys in lowercase.
:param _dict: the dict to convert
:rtype: dict
"""
# TODO should properly implement a CaseInsensitive dict.
# Look into requests code.
return dict((key.lower(), value)
for key, value in _dict.items())
def try_unique_query(curried):
"""
Try to execute a query that is expected to have a
single outcome, and log a warning if more than one document found.
:param curried: a curried function
:type curried: callable
"""
leap_assert(callable(curried), "A callable is expected")
try:
query = curried()
if query:
if len(query) > 1:
# TODO we could take action, like trigger a background
# process to kill dupes.
name = getattr(curried, 'expected', 'doc')
logger.warning(
"More than one %s found for this mbox, "
"we got a duplicate!!" % (name,))
return query.pop()
else:
return None
except Exception as exc:
logger.exception("Unhandled error %r" % exc)
MSGID_PATTERN = r"""<([\w@.]+)>"""
MSGID_RE = re.compile(MSGID_PATTERN)
class MessagePart(object):
"""
IMessagePart implementor.
It takes a subpart message and is able to find
the inner parts.
Excusatio non petita: see the interface documentation.
"""
implements(imap4.IMessagePart)
def __init__(self, soledad, part_map):
"""
Initializes the MessagePart.
:param part_map: a dictionary containing the parts map for this
message
:type part_map: dict
"""
# TODO
# It would be good to pass the uid/mailbox also
# for references while debugging.
# We have a problem on bulk moves, and is
# that when the fetch on the new mailbox is done
# the parts maybe are not complete.
# So we should be able to fail with empty
# docs until we solve that. The ideal would be
# to gather the results of the deferred operations
# to signal the operation is complete.
#leap_assert(part_map, "part map dict cannot be null")
self._soledad = soledad
self._pmap = part_map
def getSize(self):
"""
Return the total size, in octets, of this message part.
:return: size of the message, in octets
:rtype: int
"""
if not self._pmap:
return 0
size = self._pmap.get('size', None)
if not size:
logger.error("Message part cannot find size in the partmap")
return size
def getBodyFile(self):
"""
Retrieve a file object containing only the body of this message.
:return: file-like object opened for reading
:rtype: StringIO
"""
fd = StringIO.StringIO()
if self._pmap:
multi = self._pmap.get('multi')
if not multi:
phash = self._pmap.get("phash", None)
else:
pmap = self._pmap.get('part_map')
first_part = pmap.get('1', None)
if first_part:
phash = first_part['phash']
if not phash:
logger.warning("Could not find phash for this subpart!")
payload = str("")
else:
payload = self._get_payload_from_document(phash)
else:
logger.warning("Message with no part_map!")
payload = str("")
if payload:
content_type = self._get_ctype_from_document(phash)
charset = find_charset(content_type)
logger.debug("Got charset from header: %s" % (charset,))
if charset is None:
charset = self._get_charset(payload)
logger.debug("Got charset: %s" % (charset,))
try:
payload = payload.encode(charset)
except (UnicodeEncodeError, UnicodeDecodeError) as e:
logger.error("Unicode error, using 'replace'. {0!r}".format(e))
payload = payload.encode(charset, 'replace')
fd.write(payload)
fd.seek(0)
return fd
# TODO cache the phash retrieval
def _get_payload_from_document(self, phash):
"""
Gets the message payload from the content document.
:param phash: the payload hash to retrieve by.
:type phash: basestring
"""
cdocs = self._soledad.get_from_index(
fields.TYPE_P_HASH_IDX,
fields.TYPE_CONTENT_VAL, str(phash))
cdoc = first(cdocs)
if not cdoc:
logger.warning(
"Could not find the content doc "
"for phash %s" % (phash,))
payload = cdoc.content.get(fields.RAW_KEY, "")
return payload
# TODO cache the pahash retrieval
def _get_ctype_from_document(self, phash):
"""
Gets the content-type from the content document.
:param phash: the payload hash to retrieve by.
:type phash: basestring
"""
cdocs = self._soledad.get_from_index(
fields.TYPE_P_HASH_IDX,
fields.TYPE_CONTENT_VAL, str(phash))
cdoc = first(cdocs)
if not cdoc:
logger.warning(
"Could not find the content doc "
"for phash %s" % (phash,))
ctype = cdoc.content.get('ctype', "")
return ctype
@memoized_method
def _get_charset(self, stuff):
# TODO put in a common class with LeapMessage
"""
Gets (guesses?) the charset of a payload.
:param stuff: the stuff to guess about.
:type stuff: basestring
:returns: charset
"""
# XXX existential doubt 2. shouldn't we make the scope
# of the decorator somewhat more persistent?
# ah! yes! and put memory bounds.
return get_email_charset(unicode(stuff))
def getHeaders(self, negate, *names):
"""
Retrieve a group of message headers.
:param names: The names of the headers to retrieve or omit.
:type names: tuple of str
:param negate: If True, indicates that the headers listed in names
should be omitted from the return value, rather
than included.
:type negate: bool
:return: A mapping of header field names to header field values
:rtype: dict
"""
if not self._pmap:
logger.warning("No pmap in Subpart!")
return {}
headers = dict(self._pmap.get("headers", []))
# twisted imap server expects *some* headers to be lowercase
# We could use a CaseInsensitiveDict here...
headers = dict(
(str(key), str(value)) if key.lower() != "content-type"
else (str(key.lower()), str(value))
for (key, value) in headers.items())
names = map(lambda s: s.upper(), names)
if negate:
cond = lambda key: key.upper() not in names
else:
cond = lambda key: key.upper() in names
# unpack and filter original dict by negate-condition
filter_by_cond = [
map(str, (key, val)) for
key, val in headers.items()
if cond(key)]
filtered = dict(filter_by_cond)
return filtered
def isMultipart(self):
"""
Return True if this message is multipart.
"""
if not self._pmap:
logger.warning("Could not get part map!")
return False
multi = self._pmap.get("multi", False)
return multi
def getSubPart(self, part):
"""
Retrieve a MIME submessage
:type part: C{int}
:param part: The number of the part to retrieve, indexed from 0.
:raise IndexError: Raised if the specified part does not exist.
:raise TypeError: Raised if this message is not multipart.
:rtype: Any object implementing C{IMessagePart}.
:return: The specified sub-part.
"""
if not self.isMultipart():
raise TypeError
sub_pmap = self._pmap.get("part_map", {})
try:
part_map = sub_pmap[str(part + 1)]
except KeyError:
logger.debug("getSubpart for %s: KeyError" % (part,))
raise IndexError
# XXX check for validity
return MessagePart(self._soledad, part_map)
class LeapMessage(fields, MailParser, MBoxParser):
"""
The main representation of a message.
It indexes the messages in one mailbox by a combination
of uid+mailbox name.
"""
# TODO this has to change.
# Should index primarily by chash, and keep a local-lonly
# UID table.
implements(imap4.IMessage)
def __init__(self, soledad, uid, mbox, collection=None, container=None):
"""
Initializes a LeapMessage.
:param soledad: a Soledad instance
:type soledad: Soledad
:param uid: the UID for the message.
:type uid: int or basestring
:param mbox: the mbox this message belongs to
:type mbox: basestring
:param collection: a reference to the parent collection object
:type collection: MessageCollection
:param container: a IMessageContainer implementor instance
:type container: IMessageContainer
"""
MailParser.__init__(self)
self._soledad = soledad
self._uid = int(uid)
self._mbox = self._parse_mailbox_name(mbox)
self._collection = collection
self._container = container
self.__chash = None
self.__bdoc = None
@property
def _fdoc(self):
"""
An accessor to the flags document.
"""
if all(map(bool, (self._uid, self._mbox))):
fdoc = None
if self._container is not None:
fdoc = self._container.fdoc
if not fdoc:
fdoc = self._get_flags_doc()
if fdoc:
fdoc_content = maybe_call(fdoc.content)
self.__chash = fdoc_content.get(
fields.CONTENT_HASH_KEY, None)
return fdoc
@property
def _hdoc(self):
"""
An accessor to the headers document.
"""
if self._container is not None:
hdoc = self._container.hdoc
if hdoc:
return hdoc
return self._get_headers_doc()
@property
def _chash(self):
"""
An accessor to the content hash for this message.
"""
if not self._fdoc:
return None
if not self.__chash and self._fdoc:
self.__chash = maybe_call(self._fdoc.content).get(
fields.CONTENT_HASH_KEY, None)
return self.__chash
@property
def _bdoc(self):
"""
An accessor to the body document.
"""
if not self._hdoc:
return None
if not self.__bdoc:
self.__bdoc = self._get_body_doc()
return self.__bdoc
# IMessage implementation
def getUID(self):
"""
Retrieve the unique identifier associated with this Message.
:return: uid for this message
:rtype: int
"""
return self._uid
def getFlags(self):
"""
Retrieve the flags associated with this Message.
:return: The flags, represented as strings
:rtype: tuple
"""
if self._uid is None:
return []
uid = self._uid
flags = []
fdoc = self._fdoc
if fdoc:
flags = maybe_call(fdoc.content).get(self.FLAGS_KEY, None)
msgcol = self._collection
# We treat the recent flag specially: gotten from
# a mailbox-level document.
if msgcol and uid in msgcol.recent_flags:
flags.append(fields.RECENT_FLAG)
if flags:
flags = map(str, flags)
return tuple(flags)
# setFlags, addFlags, removeFlags are not in the interface spec
# but we use them with store command.
def setFlags(self, flags):
"""
Sets the flags for this message
Returns a SoledadDocument that needs to be updated by the caller.
:param flags: the flags to update in the message.
:type flags: tuple of str
:return: a SoledadDocument instance
:rtype: SoledadDocument
"""
# XXX use memory store ...!
leap_assert(isinstance(flags, tuple), "flags need to be a tuple")
log.msg('setting flags: %s (%s)' % (self._uid, flags))
doc = self._fdoc
if not doc:
logger.warning(
"Could not find FDOC for %s:%s while setting flags!" %
(self._mbox, self._uid))
return
doc.content[self.FLAGS_KEY] = flags
doc.content[self.SEEN_KEY] = self.SEEN_FLAG in flags
doc.content[self.DEL_KEY] = self.DELETED_FLAG in flags
if getattr(doc, 'store', None) != "mem":
self._soledad.put_doc(doc)
def addFlags(self, flags):
"""
Adds flags to this message.
Returns a SoledadDocument that needs to be updated by the caller.
:param flags: the flags to add to the message.
:type flags: tuple of str
:return: a SoledadDocument instance
:rtype: SoledadDocument
"""
leap_assert(isinstance(flags, tuple), "flags need to be a tuple")
oldflags = self.getFlags()
self.setFlags(tuple(set(flags + oldflags)))
def removeFlags(self, flags):
"""
Remove flags from this message.
Returns a SoledadDocument that needs to be updated by the caller.
:param flags: the flags to be removed from the message.
:type flags: tuple of str
:return: a SoledadDocument instance
:rtype: SoledadDocument
"""
leap_assert(isinstance(flags, tuple), "flags need to be a tuple")
oldflags = self.getFlags()
self.setFlags(tuple(set(oldflags) - set(flags)))
def getInternalDate(self):
"""
Retrieve the date internally associated with this message
:rtype: C{str}
:return: An RFC822-formatted date string.
"""
date = self._hdoc.content.get(self.DATE_KEY, '')
return str(date)
#
# IMessagePart
#
# XXX we should implement this interface too for the subparts
# so we allow nested parts...
def getBodyFile(self):
"""
Retrieve a file object containing only the body of this message.
:return: file-like object opened for reading
:rtype: StringIO
"""
# TODO refactor with getBodyFile in MessagePart
fd = StringIO.StringIO()
if self._bdoc is not None:
bdoc_content = self._bdoc.content
body = bdoc_content.get(self.RAW_KEY, "")
content_type = bdoc_content.get('content-type', "")
charset = find_charset(content_type)
logger.debug('got charset from content-type: %s' % charset)
if charset is None:
charset = self._get_charset(body)
try:
body = body.encode(charset)
except UnicodeError as e:
logger.error("Unicode error {0}".format(e))
logger.debug("Attempted to encode with: %s" % charset)
try:
body = body.encode(charset, 'replace')
except UnicodeError as e:
try:
body = body.encode('utf-8', 'replace')
except:
pass
# We are still returning funky characters from here.
else:
logger.warning("No BDOC found for message.")
body = str("")
fd.write(body)
fd.seek(0)
return fd
@memoized_method
def _get_charset(self, stuff):
"""
Gets (guesses?) the charset of a payload.
:param stuff: the stuff to guess about.
:type stuff: basestring
:returns: charset
"""
# TODO get from subpart headers
# XXX existential doubt 2. shouldn't we make the scope
# of the decorator somewhat more persistent?
# ah! yes! and put memory bounds.
return get_email_charset(unicode(stuff))
def getSize(self):
"""
Return the total size, in octets, of this message.
:return: size of the message, in octets
:rtype: int
"""
size = None
if self._fdoc:
fdoc_content = maybe_call(self._fdoc.content)
size = fdoc_content.get(self.SIZE_KEY, False)
else:
logger.warning("No FLAGS doc for %s:%s" % (self._mbox,
self._uid))
if not size:
# XXX fallback, should remove when all migrated.
size = self.getBodyFile().len
return size
def getHeaders(self, negate, *names):
"""
Retrieve a group of message headers.
:param names: The names of the headers to retrieve or omit.
:type names: tuple of str
:param negate: If True, indicates that the headers listed in names
should be omitted from the return value, rather
than included.
:type negate: bool
:return: A mapping of header field names to header field values
:rtype: dict
"""
# TODO split in smaller methods
headers = self._get_headers()
if not headers:
logger.warning("No headers found")
return {str('content-type'): str('')}
names = map(lambda s: s.upper(), names)
if negate:
cond = lambda key: key.upper() not in names
else:
cond = lambda key: key.upper() in names
if isinstance(headers, list):
headers = dict(headers)
# default to most likely standard
charset = find_charset(headers, "utf-8")
# twisted imap server expects *some* headers to be lowercase
# XXX refactor together with MessagePart method
headers2 = dict()
for key, value in headers.items():
if key.lower() == "content-type":
key = key.lower()
if not isinstance(key, str):
key = key.encode(charset, 'replace')
if not isinstance(value, str):
value = value.encode(charset, 'replace')
# filter original dict by negate-condition
if cond(key):
headers2[key] = value
return headers2
def _get_headers(self):
"""
Return the headers dict for this message.
"""
if self._hdoc is not None:
hdoc_content = maybe_call(self._hdoc.content)
headers = hdoc_content.get(self.HEADERS_KEY, {})
return headers
else:
logger.warning(
"No HEADERS doc for msg %s:%s" % (
self._mbox,
self._uid))
def isMultipart(self):
"""
Return True if this message is multipart.
"""
if self._fdoc:
fdoc_content = maybe_call(self._fdoc.content)
is_multipart = fdoc_content.get(self.MULTIPART_KEY, False)
return is_multipart
else:
logger.warning(
"No FLAGS doc for msg %s:%s" % (
self._mbox,
self._uid))
def getSubPart(self, part):
"""
Retrieve a MIME submessage
:type part: C{int}
:param part: The number of the part to retrieve, indexed from 0.
:raise IndexError: Raised if the specified part does not exist.
:raise TypeError: Raised if this message is not multipart.
:rtype: Any object implementing C{IMessagePart}.
:return: The specified sub-part.
"""
if not self.isMultipart():
raise TypeError
try:
pmap_dict = self._get_part_from_parts_map(part + 1)
except KeyError:
raise IndexError
return MessagePart(self._soledad, pmap_dict)
#
# accessors
#
def _get_part_from_parts_map(self, part):
"""
Get a part map from the headers doc
:raises: KeyError if key does not exist
:rtype: dict
"""
if not self._hdoc:
logger.warning("Tried to get part but no HDOC found!")
return None
hdoc_content = maybe_call(self._hdoc.content)
pmap = hdoc_content.get(fields.PARTS_MAP_KEY, {})
return pmap[str(part)]
def _get_flags_doc(self):
"""
Return the document that keeps the flags for this
message.
"""
result = {}
try:
flag_docs = self._soledad.get_from_index(
fields.TYPE_MBOX_UID_IDX,
fields.TYPE_FLAGS_VAL, self._mbox, str(self._uid))
result = first(flag_docs)
except Exception as exc:
# ugh! Something's broken down there!
logger.warning("ERROR while getting flags for UID: %s" % self._uid)
logger.exception(exc)
finally:
return result
def _get_headers_doc(self):
"""
Return the document that keeps the headers for this
message.
"""
head_docs = self._soledad.get_from_index(
fields.TYPE_C_HASH_IDX,
fields.TYPE_HEADERS_VAL, str(self._chash))
return first(head_docs)
def _get_body_doc(self):
"""
Return the document that keeps the body for this
message.
"""
hdoc_content = maybe_call(self._hdoc.content)
body_phash = hdoc_content.get(
fields.BODY_KEY, None)
if not body_phash:
logger.warning("No body phash for this document!")
return None
# XXX get from memstore too...
# if memstore: memstore.get_phrash
# memstore should keep a dict with weakrefs to the
# phash doc...
if self._container is not None:
bdoc = self._container.memstore.get_by_phash(body_phash)
if bdoc:
return bdoc
else:
print "no doc for that phash found!"
# no memstore or no doc found there
if self._soledad:
body_docs = self._soledad.get_from_index(
fields.TYPE_P_HASH_IDX,
fields.TYPE_CONTENT_VAL, str(body_phash))
return first(body_docs)
else:
logger.error("No phash in container, and no soledad found!")
def __getitem__(self, key):
"""
Return an item from the content of the flags document,
for convenience.
:param key: The key
:type key: str
:return: The content value indexed by C{key} or None
:rtype: str
"""
return maybe_call(self._fdoc.content).get(key, None)
# setters
# XXX to be used in the messagecopier interface?!
def set_uid(self, uid):
"""
Set new uid for this message.
:param uid: the new uid
:type uid: basestring
"""
# XXX dangerous! lock?
self._uid = uid
d = self._fdoc
d.content[self.UID_KEY] = uid
self._soledad.put_doc(d)
def set_mbox(self, mbox):
"""
Set new mbox for this message.
:param mbox: the new mbox
:type mbox: basestring
"""
# XXX dangerous! lock?
self._mbox = mbox
d = self._fdoc
d.content[self.MBOX_KEY] = mbox
self._soledad.put_doc(d)
# destructor
@deferred
def remove(self):
"""
Remove all docs associated with this message.
"""
# XXX For the moment we are only removing the flags and headers
# docs. The rest we leave there polluting your hard disk,
# until we think about a good way of deorphaning.
# Maybe a crawler of unreferenced docs.
# XXX remove from memory store!!!
# XXX implement elijah's idea of using a PUT document as a
# token to ensure consistency in the removal.
uid = self._uid
fd = self._get_flags_doc()
#hd = self._get_headers_doc()
#bd = self._get_body_doc()
#docs = [fd, hd, bd]
docs = [fd]
for d in filter(None, docs):
try:
self._soledad.delete_doc(d)
except Exception as exc:
logger.error(exc)
return uid
def does_exist(self):
"""
Return True if there is actually a flags message for this
UID and mbox.
"""
return self._fdoc is not None
class ContentDedup(object):
"""
Message deduplication.
We do a query for the content hashes before writing to our beloved
sqlcipher backend of Soledad. This means, by now, that:
1. We will not store the same attachment twice, only the hash of it.
2. We will not store the same message body twice, only the hash of it.
The first case is useful if you are always receiving the same old memes
from unwary friends that still have not discovered that 4chan is the
generator of the internet. The second will save your day if you have
initiated session with the same account in two different machines. I also
wonder why would you do that, but let's respect each other choices, like
with the religious celebrations, and assume that one day we'll be able
to run Bitmask in completely free phones. Yes, I mean that, the whole GSM
Stack.
"""
def _content_does_exist(self, doc):
"""
Check whether we already have a content document for a payload
with this hash in our database.
:param doc: tentative body document
:type doc: dict
:returns: True if that happens, False otherwise.
"""
if not doc:
return False
phash = doc[fields.PAYLOAD_HASH_KEY]
attach_docs = self._soledad.get_from_index(
fields.TYPE_P_HASH_IDX,
fields.TYPE_CONTENT_VAL, str(phash))
if not attach_docs:
return False
if len(attach_docs) != 1:
logger.warning("Found more than one copy of phash %s!"
% (phash,))
logger.debug("Found attachment doc with that hash! Skipping save!")
return True
SoledadWriterPayload = namedtuple(
'SoledadWriterPayload', ['mode', 'payload'])
# TODO we could consider using enum here:
# https://pypi.python.org/pypi/enum
SoledadWriterPayload.CREATE = 1
SoledadWriterPayload.PUT = 2
SoledadWriterPayload.CONTENT_CREATE = 3
"""
SoledadDocWriter was used to avoid writing to the db from multiple threads.
Its use here has been deprecated in favor of a local rw_lock in the client.
But we might want to reuse in in the near future to implement priority queues.
"""
class SoledadDocWriter(object):
"""
This writer will create docs serially in the local soledad database.
"""
implements(IMessageConsumer)
def __init__(self, soledad):
"""
Initialize the writer.
:param soledad: the soledad instance
:type soledad: Soledad
"""
self._soledad = soledad
def _get_call_for_item(self, item):
"""
Return the proper call type for a given item.
:param item: one of the types defined under the
attributes of SoledadWriterPayload
:type item: int
"""
call = None
payload = item.payload
if item.mode == SoledadWriterPayload.CREATE:
call = self._soledad.create_doc
elif (item.mode == SoledadWriterPayload.CONTENT_CREATE
and not self._content_does_exist(payload)):
call = self._soledad.create_doc
elif item.mode == SoledadWriterPayload.PUT:
call = self._soledad.put_doc
return call
def _process(self, queue):
"""
Return the item and the proper call type for the next
item in the queue if any.
:param queue: the queue from where we'll pick item.
:type queue: Queue
"""
item = queue.get()
call = self._get_call_for_item(item)
return item, call
def consume(self, queue):
"""
Creates a new document in soledad db.
:param queue: queue to get item from, with content of the document
to be inserted.
:type queue: Queue
"""
empty = queue.empty()
while not empty:
item, call = self._process(queue)
if call:
# XXX should handle the delete case
# should handle errors
try:
call(item.payload)
except u1db_errors.RevisionConflict as exc:
logger.error("Error: %r" % (exc,))
raise exc
empty = queue.empty()
class MessageCollection(WithMsgFields, IndexedDB, MailParser, MBoxParser,
ContentDedup):
"""
A collection of messages, surprisingly.
It is tied to a selected mailbox name that is passed to its constructor.
Implements a filter query over the messages contained in a soledad
database.
"""
# XXX this should be able to produce a MessageSet methinks
# could validate these kinds of objects turning them
# into a template for the class.
FLAGS_DOC = "FLAGS"
HEADERS_DOC = "HEADERS"
CONTENT_DOC = "CONTENT"
"""
RECENT_DOC is a document that stores a list of the UIDs
with the recent flag for this mailbox. It deserves a special treatment
because:
(1) it cannot be set by the user
(2) it's a flag that we set inmediately after a fetch, which is quite
often.
(3) we need to be able to set/unset it in batches without doing a single
write for each element in the sequence.
"""
RECENT_DOC = "RECENT"
"""
HDOCS_SET_DOC is a document that stores a set of the Document-IDs
(the u1db index) for all the headers documents for a given mailbox.
We use it to prefetch massively all the headers for a mailbox.
This is the second massive query, after fetching all the FLAGS, that
a MUA will do in a case where we do not have local disk cache.
"""
HDOCS_SET_DOC = "HDOCS_SET"
templates = {
# Message Level
FLAGS_DOC: {
fields.TYPE_KEY: fields.TYPE_FLAGS_VAL,
fields.UID_KEY: 1, # XXX moe to a local table
fields.MBOX_KEY: fields.INBOX_VAL,
fields.CONTENT_HASH_KEY: "",
fields.SEEN_KEY: False,
fields.DEL_KEY: False,
fields.FLAGS_KEY: [],
fields.MULTIPART_KEY: False,
fields.SIZE_KEY: 0
},
HEADERS_DOC: {
fields.TYPE_KEY: fields.TYPE_HEADERS_VAL,
fields.CONTENT_HASH_KEY: "",
fields.DATE_KEY: "",
fields.SUBJECT_KEY: "",
fields.HEADERS_KEY: {},
fields.PARTS_MAP_KEY: {},
},
CONTENT_DOC: {
fields.TYPE_KEY: fields.TYPE_CONTENT_VAL,
fields.PAYLOAD_HASH_KEY: "",
fields.LINKED_FROM_KEY: [],
fields.CTYPE_KEY: "", # should index by this too
# should only get inmutable headers parts
# (for indexing)
fields.HEADERS_KEY: {},
fields.RAW_KEY: "",
fields.PARTS_MAP_KEY: {},
fields.HEADERS_KEY: {},
fields.MULTIPART_KEY: False,
},
# Mailbox Level
RECENT_DOC: {
fields.TYPE_KEY: fields.TYPE_RECENT_VAL,
fields.MBOX_KEY: fields.INBOX_VAL,
fields.RECENTFLAGS_KEY: [],
},
HDOCS_SET_DOC: {
fields.TYPE_KEY: fields.TYPE_HDOCS_SET_VAL,
fields.MBOX_KEY: fields.INBOX_VAL,
fields.HDOCS_SET_KEY: [],
}
}
# Different locks for wrapping both the u1db document getting/setting
# and the property getting/settting in an atomic operation.
# TODO we would abstract this to a SoledadProperty class
_rdoc_lock = threading.Lock()
_rdoc_property_lock = threading.Lock()
_hdocset_lock = threading.Lock()
_hdocset_property_lock = threading.Lock()
def __init__(self, mbox=None, soledad=None, memstore=None):
"""
Constructor for MessageCollection.
On initialization, we ensure that we have a document for
storing the recent flags. The nature of this flag make us wanting
to store the set of the UIDs with this flag at the level of the
MessageCollection for each mailbox, instead of treating them
as a property of each message.
We are passed an instance of MemoryStore, the same for the
SoledadBackedAccount, that we use as a read cache and a buffer
for writes.
:param mbox: the name of the mailbox. It is the name
with which we filter the query over the
messages database.
:type mbox: str
:param soledad: Soledad database
:type soledad: Soledad instance
:param memstore: a MemoryStore instance
:type memstore: MemoryStore
"""
MailParser.__init__(self)
leap_assert(mbox, "Need a mailbox name to initialize")
leap_assert(mbox.strip() != "", "mbox cannot be blank space")
leap_assert(isinstance(mbox, (str, unicode)),
"mbox needs to be a string")
leap_assert(soledad, "Need a soledad instance to initialize")
# okay, all in order, keep going...
self.mbox = self._parse_mailbox_name(mbox)
self._soledad = soledad
self._memstore = memstore
self.__rflags = None
self.__hdocset = None
self.initialize_db()
# ensure that we have a recent-flags and a hdocs-sec doc
self._get_or_create_rdoc()
self._get_or_create_hdocset()
def _get_empty_doc(self, _type=FLAGS_DOC):
"""
Returns an empty doc for storing different message parts.
Defaults to returning a template for a flags document.
:return: a dict with the template
:rtype: dict
"""
if not _type in self.templates.keys():
raise TypeError("Improper type passed to _get_empty_doc")
return copy.deepcopy(self.templates[_type])
def _get_or_create_rdoc(self):
"""
Try to retrieve the recent-flags doc for this MessageCollection,
and create one if not found.
"""
rdoc = self._get_recent_doc()
if not rdoc:
rdoc = self._get_empty_doc(self.RECENT_DOC)
if self.mbox != fields.INBOX_VAL:
rdoc[fields.MBOX_KEY] = self.mbox
self._soledad.create_doc(rdoc)
def _get_or_create_hdocset(self):
"""
Try to retrieve the hdocs-set doc for this MessageCollection,
and create one if not found.
"""
hdocset = self._get_hdocset_doc()
if not hdocset:
hdocset = self._get_empty_doc(self.HDOCS_SET_DOC)
if self.mbox != fields.INBOX_VAL:
hdocset[fields.MBOX_KEY] = self.mbox
self._soledad.create_doc(hdocset)
def _do_parse(self, raw):
"""
Parse raw message and return it along with
relevant information about its outer level.
:param raw: the raw message
:type raw: StringIO or basestring
:return: msg, chash, size, multi
:rtype: tuple
"""
msg = self._get_parsed_msg(raw)
chash = self._get_hash(msg)
size = len(msg.as_string())
multi = msg.is_multipart()
return msg, chash, size, multi
def _populate_flags(self, flags, uid, chash, size, multi):
"""
Return a flags doc.
XXX Missing DOC -----------
"""
fd = self._get_empty_doc(self.FLAGS_DOC)
fd[self.MBOX_KEY] = self.mbox
fd[self.UID_KEY] = uid
fd[self.CONTENT_HASH_KEY] = chash
fd[self.SIZE_KEY] = size
fd[self.MULTIPART_KEY] = multi
if flags:
fd[self.FLAGS_KEY] = map(self._stringify, flags)
fd[self.SEEN_KEY] = self.SEEN_FLAG in flags
fd[self.DEL_KEY] = self.DELETED_FLAG in flags
fd[self.RECENT_KEY] = True # set always by default
return fd
def _populate_headr(self, msg, chash, subject, date):
"""
Return a headers doc.
XXX Missing DOC -----------
"""
headers = defaultdict(list)
for k, v in msg.items():
headers[k].append(v)
# "fix" for repeated headers.
for k, v in headers.items():
newline = "\n%s: " % (k,)
headers[k] = newline.join(v)
lower_headers = lowerdict(headers)
msgid = first(MSGID_RE.findall(
lower_headers.get('message-id', '')))
hd = self._get_empty_doc(self.HEADERS_DOC)
hd[self.CONTENT_HASH_KEY] = chash
hd[self.HEADERS_KEY] = headers
hd[self.MSGID_KEY] = msgid
if not subject and self.SUBJECT_FIELD in headers:
hd[self.SUBJECT_KEY] = headers[self.SUBJECT_FIELD]
else:
hd[self.SUBJECT_KEY] = subject
if not date and self.DATE_FIELD in headers:
hd[self.DATE_KEY] = headers[self.DATE_FIELD]
else:
hd[self.DATE_KEY] = date
return hd
def _fdoc_already_exists(self, chash):
"""
Check whether we can find a flags doc for this mailbox with the
given content-hash. It enforces that we can only have the same maessage
listed once for a a given mailbox.
:param chash: the content-hash to check about.
:type chash: basestring
:return: False, if it does not exist, or UID.
"""
exist = self._get_fdoc_from_chash(chash)
if exist:
return exist.content.get(fields.UID_KEY, "unknown-uid")
else:
return False
@deferred
def add_msg(self, raw, subject=None, flags=None, date=None, uid=1):
"""
Creates a new message document.
Here lives the magic of the leap mail. Well, in soledad, really.
:param raw: the raw message
:type raw: str
:param subject: subject of the message.
:type subject: str
:param flags: flags
:type flags: list
:param date: the received date for the message
:type date: str
:param uid: the message uid for this mailbox
:type uid: int
"""
# TODO signal that we can delete the original message!-----
# when all the processing is done.
# TODO add the linked-from info !
# TODO add reference to the original message
logger.debug('adding message')
if flags is None:
flags = tuple()
leap_assert_type(flags, tuple)
# parse
msg, chash, size, multi = self._do_parse(raw)
# check for uniqueness.
if self._fdoc_already_exists(chash):
logger.warning("We already have that message in this mailbox.")
# note that this operation will leave holes in the UID sequence,
# but we're gonna change that all the same for a local-only table.
# so not touch it by the moment.
return False
fd = self._populate_flags(flags, uid, chash, size, multi)
hd = self._populate_headr(msg, chash, subject, date)
parts = walk.get_parts(msg)
body_phash_fun = [walk.get_body_phash_simple,
walk.get_body_phash_multi][int(multi)]
body_phash = body_phash_fun(walk.get_payloads(msg))
parts_map = walk.walk_msg_tree(parts, body_phash=body_phash)
# add parts map to header doc
# (body, multi, part_map)
for key in parts_map:
hd[key] = parts_map[key]
del parts_map
# The MessageContainer expects a dict, zero-indexed
# XXX review-me
cdocs = dict((index, doc) for index, doc in
enumerate(walk.get_raw_docs(msg, parts)))
print "cdocs is", cdocs
# Saving ----------------------------------------
# XXX should check for content duplication on headers too
# but with chash. !!!
# XXX adapt hdocset to use memstore
#hdoc = self._soledad.create_doc(hd)
# We add the newly created hdoc to the fast-access set of
# headers documents associated with the mailbox.
#self.add_hdocset_docid(hdoc.doc_id)
# XXX move to memory store too
# self.set_recent_flag(uid)
# TODO ---- add reference to original doc, to be deleted
# after writes are done.
msg_container = MessageDict(fd, hd, cdocs)
self._memstore.put(self.mbox, uid, msg_container)
def _remove_cb(self, result):
return result
def remove_all_deleted(self):
"""
Removes all messages flagged as deleted.
"""
delete_deferl = []
for msg in self.get_deleted():
delete_deferl.append(msg.remove())
d1 = defer.gatherResults(delete_deferl, consumeErrors=True)
d1.addCallback(self._remove_cb)
return d1
def remove(self, msg):
"""
Remove a given msg.
:param msg: the message to be removed
:type msg: LeapMessage
"""
d = msg.remove()
d.addCallback(self._remove_cb)
return d
#
# getters: specific queries
#
# recent flags
# XXX FIXME -------------------------------------
# This should be rewritten to use memory store.
def _get_recent_flags(self):
"""
An accessor for the recent-flags set for this mailbox.
"""
if not self.__rflags:
with self._rdoc_lock:
rdoc = self._get_recent_doc()
self.__rflags = set(rdoc.content.get(
fields.RECENTFLAGS_KEY, []))
return self.__rflags
def _set_recent_flags(self, value):
"""
Setter for the recent-flags set for this mailbox.
"""
with self._rdoc_lock:
rdoc = self._get_recent_doc()
newv = set(value)
self.__rflags = newv
rdoc.content[fields.RECENTFLAGS_KEY] = list(newv)
# XXX should deferLater 0 it?
self._soledad.put_doc(rdoc)
recent_flags = property(
_get_recent_flags, _set_recent_flags,
doc="Set of UIDs with the recent flag for this mailbox.")
def _get_recent_doc(self):
"""
Get recent-flags document for this mailbox.
"""
curried = partial(
self._soledad.get_from_index,
fields.TYPE_MBOX_IDX,
fields.TYPE_RECENT_VAL, self.mbox)
curried.expected = "rdoc"
rdoc = try_unique_query(curried)
return rdoc
# Property-set modification (protected by a different
# lock to give atomicity to the read/write operation)
def unset_recent_flags(self, uids):
"""
Unset Recent flag for a sequence of uids.
"""
with self._rdoc_property_lock:
self.recent_flags = self.recent_flags.difference(
set(uids))
def unset_recent_flag(self, uid):
"""
Unset Recent flag for a given uid.
"""
with self._rdoc_property_lock:
self.recent_flags = self.recent_flags.difference(
set([uid]))
def set_recent_flag(self, uid):
"""
Set Recent flag for a given uid.
"""
with self._rdoc_property_lock:
self.recent_flags = self.recent_flags.union(
set([uid]))
# headers-docs-set
# XXX FIXME -------------------------------------
# This should be rewritten to use memory store.
def _get_hdocset(self):
"""
An accessor for the hdocs-set for this mailbox.
"""
if not self.__hdocset:
with self._hdocset_lock:
hdocset_doc = self._get_hdocset_doc()
value = set(hdocset_doc.content.get(
fields.HDOCS_SET_KEY, []))
self.__hdocset = value
return self.__hdocset
def _set_hdocset(self, value):
"""
Setter for the hdocs-set for this mailbox.
"""
with self._hdocset_lock:
hdocset_doc = self._get_hdocset_doc()
newv = set(value)
self.__hdocset = newv
hdocset_doc.content[fields.HDOCS_SET_KEY] = list(newv)
# XXX should deferLater 0 it?
self._soledad.put_doc(hdocset_doc)
_hdocset = property(
_get_hdocset, _set_hdocset,
doc="Set of Document-IDs for the headers docs associated "
"with this mailbox.")
def _get_hdocset_doc(self):
"""
Get hdocs-set document for this mailbox.
"""
curried = partial(
self._soledad.get_from_index,
fields.TYPE_MBOX_IDX,
fields.TYPE_HDOCS_SET_VAL, self.mbox)
curried.expected = "hdocset"
hdocset_doc = try_unique_query(curried)
return hdocset_doc
# Property-set modification (protected by a different
# lock to give atomicity to the read/write operation)
def remove_hdocset_docids(self, docids):
"""
Remove the given document IDs from the set of
header-documents associated with this mailbox.
"""
with self._hdocset_property_lock:
self._hdocset = self._hdocset.difference(
set(docids))
def remove_hdocset_docid(self, docid):
"""
Remove the given document ID from the set of
header-documents associated with this mailbox.
"""
with self._hdocset_property_lock:
self._hdocset = self._hdocset.difference(
set([docid]))
def add_hdocset_docid(self, docid):
"""
Add the given document ID to the set of
header-documents associated with this mailbox.
"""
with self._hdocset_property_lock:
self._hdocset = self._hdocset.union(
set([docid]))
# individual doc getters, message layer.
def _get_fdoc_from_chash(self, chash):
"""
Return a flags document for this mailbox with a given chash.
:return: A SoledadDocument containing the Flags Document, or None if
the query failed.
:rtype: SoledadDocument or None.
"""
curried = partial(
self._soledad.get_from_index,
fields.TYPE_MBOX_C_HASH_IDX,
fields.TYPE_FLAGS_VAL, self.mbox, chash)
curried.expected = "fdoc"
return try_unique_query(curried)
def _get_uid_from_msgidCb(self, msgid):
hdoc = None
curried = partial(
self._soledad.get_from_index,
fields.TYPE_MSGID_IDX,
fields.TYPE_HEADERS_VAL, msgid)
curried.expected = "hdoc"
hdoc = try_unique_query(curried)
if hdoc is None:
logger.warning("Could not find hdoc for msgid %s"
% (msgid,))
return None
msg_chash = hdoc.content.get(fields.CONTENT_HASH_KEY)
fdoc = self._get_fdoc_from_chash(msg_chash)
if not fdoc:
logger.warning("Could not find fdoc for msgid %s"
% (msgid,))
return None
return fdoc.content.get(fields.UID_KEY, None)
@deferred
def _get_uid_from_msgid(self, msgid):
"""
Return a UID for a given message-id.
It first gets the headers-doc for that msg-id, and
it found it queries the flags doc for the current mailbox
for the matching content-hash.
:return: A UID, or None
"""
# We need to wait a little bit, cause in some of the cases
# the query is received right after we've saved the document,
# and we cannot find it otherwise. This seems to be enough.
# XXX do a deferLater instead ??
time.sleep(0.3)
return self._get_uid_from_msgidCb(msgid)
# getters: generic for a mailbox
def get_msg_by_uid(self, uid):
"""
Retrieves a LeapMessage by UID.
This is used primarity in the Mailbox fetch and store methods.
:param uid: the message uid to query by
:type uid: int
:return: A LeapMessage instance matching the query,
or None if not found.
:rtype: LeapMessage
"""
print "getting msg by id!"
msg_container = self._memstore.get(self.mbox, uid)
print "msg container", msg_container
if msg_container is not None:
print "getting LeapMessage (from memstore)"
msg = LeapMessage(None, uid, self.mbox, collection=self,
container=msg_container)
print "got msg:", msg
else:
msg = LeapMessage(self._soledad, uid, self.mbox, collection=self)
if not msg.does_exist():
return None
return msg
def get_all_docs(self, _type=fields.TYPE_FLAGS_VAL):
"""
Get all documents for the selected mailbox of the
passed type. By default, it returns the flag docs.
If you want acess to the content, use __iter__ instead
:return: a list of u1db documents
:rtype: list of SoledadDocument
"""
if _type not in fields.__dict__.values():
raise TypeError("Wrong type passed to get_all_docs")
if sameProxiedObjects(self._soledad, None):
logger.warning('Tried to get messages but soledad is None!')
return []
all_docs = [doc for doc in self._soledad.get_from_index(
fields.TYPE_MBOX_IDX,
_type, self.mbox)]
# inneficient, but first let's grok it and then
# let's worry about efficiency.
# XXX FIXINDEX -- should implement order by in soledad
# FIXME ----------------------------------------------
return sorted(all_docs, key=lambda item: item.content['uid'])
def all_uid_iter(self):
"""
Return an iterator trhough the UIDs of all messages, sorted in
ascending order.
"""
# XXX we should get this from the uid table, local-only
# XXX FIXME -------------
# This should be cached in the memstoretoo
db_uids = set([doc.content[self.UID_KEY] for doc in
self._soledad.get_from_index(
fields.TYPE_MBOX_IDX,
fields.TYPE_FLAGS_VAL, self.mbox)])
if self._memstore is not None:
mem_uids = self._memstore.get_uids(self.mbox)
uids = db_uids.union(set(mem_uids))
else:
uids = db_uids
return (u for u in sorted(uids))
def reset_last_uid(self, param):
"""
Set the last uid to the highest uid found.
Used while expunging, passed as a callback.
"""
try:
self.last_uid = max(self.all_uid_iter()) + 1
except ValueError:
# empty sequence
pass
return param
def all_flags(self):
"""
Return a dict with all flags documents for this mailbox.
"""
# XXX get all from memstore and cahce it there
all_flags = dict(((
doc.content[self.UID_KEY],
doc.content[self.FLAGS_KEY]) for doc in
self._soledad.get_from_index(
fields.TYPE_MBOX_IDX,
fields.TYPE_FLAGS_VAL, self.mbox)))
if self._memstore is not None:
# XXX
uids = self._memstore.get_uids(self.mbox)
fdocs = [(uid, self._memstore.get(self.mbox, uid).fdoc)
for uid in uids]
for uid, doc in fdocs:
all_flags[uid] = doc.content[self.FLAGS_KEY]
return all_flags
def all_flags_chash(self):
"""
Return a dict with the content-hash for all flag documents
for this mailbox.
"""
all_flags_chash = dict(((
doc.content[self.UID_KEY],
doc.content[self.CONTENT_HASH_KEY]) for doc in
self._soledad.get_from_index(
fields.TYPE_MBOX_IDX,
fields.TYPE_FLAGS_VAL, self.mbox)))
return all_flags_chash
def all_headers(self):
"""
Return a dict with all the headers documents for this
mailbox.
"""
all_headers = dict(((
doc.content[self.CONTENT_HASH_KEY],
doc.content[self.HEADERS_KEY]) for doc in
self._soledad.get_docs(self._hdocset)))
return all_headers
def count(self):
"""
Return the count of messages for this mailbox.
:rtype: int
"""
# XXX We could cache this in memstore too until next write...
count = self._soledad.get_count_from_index(
fields.TYPE_MBOX_IDX,
fields.TYPE_FLAGS_VAL, self.mbox)
if self._memstore is not None:
count += self._memstore.count_new()
return count
# unseen messages
def unseen_iter(self):
"""
Get an iterator for the message UIDs with no `seen` flag
for this mailbox.
:return: iterator through unseen message doc UIDs
:rtype: iterable
"""
return (doc.content[self.UID_KEY] for doc in
self._soledad.get_from_index(
fields.TYPE_MBOX_SEEN_IDX,
fields.TYPE_FLAGS_VAL, self.mbox, '0'))
def count_unseen(self):
"""
Count all messages with the `Unseen` flag.
:returns: count
:rtype: int
"""
count = self._soledad.get_count_from_index(
fields.TYPE_MBOX_SEEN_IDX,
fields.TYPE_FLAGS_VAL, self.mbox, '0')
return count
def get_unseen(self):
"""
Get all messages with the `Unseen` flag
:returns: a list of LeapMessages
:rtype: list
"""
return [LeapMessage(self._soledad, docid, self.mbox)
for docid in self.unseen_iter()]
# recent messages
def count_recent(self):
"""
Count all messages with the `Recent` flag.
It just retrieves the length of the recent_flags set,
which is stored in a specific type of document for
this collection.
:returns: count
:rtype: int
"""
return len(self.recent_flags)
# deleted messages
def deleted_iter(self):
"""
Get an iterator for the message UIDs with `deleted` flag.
:return: iterator through deleted message docs
:rtype: iterable
"""
return (doc.content[self.UID_KEY] for doc in
self._soledad.get_from_index(
fields.TYPE_MBOX_DEL_IDX,
fields.TYPE_FLAGS_VAL, self.mbox, '1'))
def get_deleted(self):
"""
Get all messages with the `Deleted` flag.
:returns: a generator of LeapMessages
:rtype: generator
"""
return (LeapMessage(self._soledad, docid, self.mbox)
for docid in self.deleted_iter())
def __len__(self):
"""
Returns the number of messages on this mailbox.
:rtype: int
"""
return self.count()
def __iter__(self):
"""
Returns an iterator over all messages.
:returns: iterator of dicts with content for all messages.
:rtype: iterable
"""
return (LeapMessage(self._soledad, docuid, self.mbox)
for docuid in self.all_uid_iter())
def __repr__(self):
"""
Representation string for this object.
"""
return u"" % (
self.mbox, self.count())
# XXX should implement __eq__ also !!!
# use chash...