models.py 28.6 KB
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# Patchwork - automated patch tracking system
# Copyright (C) 2008 Jeremy Kerr <jk@ozlabs.org>
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# Copyright (C) 2015 Intel Corporation
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#
# This file is part of the Patchwork package.
#
# Patchwork 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 2 of the License, or
# (at your option) any later version.
#
# Patchwork 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 Patchwork; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

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from django.contrib import auth
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from django.contrib.auth.models import User
from django.core.urlresolvers import reverse
from django.contrib.sites.models import Site
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from django.conf import settings
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from django.db import models
from django.db.models import Q
import django.dispatch
from django.utils import six
from django.utils.encoding import python_2_unicode_compatible
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from django.utils.functional import cached_property
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from django.utils.six import add_metaclass
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import jsonfield
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import threadlocalrequest
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from patchwork.parser import hash_patch, extract_tags

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import re
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import datetime
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import random
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from collections import Counter, OrderedDict
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@python_2_unicode_compatible
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class Person(models.Model):
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    email = models.CharField(max_length=255, unique=True)
    name = models.CharField(max_length=255, null=True, blank=True)
    user = models.ForeignKey(User, null=True, blank=True,
                             on_delete=models.SET_NULL)
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    def display_name(self):
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        if self.name:
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            return self.name
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        else:
            return self.email

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    def email_name(self):
        if (self.name):
            return "%s <%s>" % (self.name, self.email)
        else:
            return self.email

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    def link_to_user(self, user):
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        self.name = user.profile.name()
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        self.user = user

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    def __str__(self):
        return self.display_name()

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    class Meta:
        verbose_name_plural = 'People'

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def get_comma_separated_field(value):
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    if not value:
        return []
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    tags = [v.strip() for v in value.split(',')]
    tags = [tag for tag in tags if tag]
    return tags

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@python_2_unicode_compatible
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class Project(models.Model):
    linkname = models.CharField(max_length=255, unique=True)
    name = models.CharField(max_length=255, unique=True)
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    description = models.TextField(blank=True, null=True)
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    listid = models.CharField(max_length=255)
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    listemail = models.CharField(max_length=200)
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    web_url = models.CharField(max_length=2000, blank=True)
    scm_url = models.CharField(max_length=2000, blank=True)
    webscm_url = models.CharField(max_length=2000, blank=True)
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    send_notifications = models.BooleanField(default=False)
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    use_tags = models.BooleanField(default=True)
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    git_send_email_only = models.BooleanField(default=False)
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    subject_prefix_tags = models.CharField(max_length=255, blank=True,
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               help_text='Comma separated list of tags')
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    def is_editable(self, user):
        if not user.is_authenticated():
            return False
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        return self in user.profile.maintainer_projects.all()
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    @cached_property
    def tags(self):
        if not self.use_tags:
            return []
        return list(Tag.objects.all())

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    def get_subject_prefix_tags(self):
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        return get_comma_separated_field(self.subject_prefix_tags)
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    def __str__(self):
        return self.name

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    class Meta:
        ordering = ['linkname']

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def user_name(user):
    if user.first_name or user.last_name:
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        names = list(filter(bool, [user.first_name, user.last_name]))
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        return u' '.join(names)
    return user.username
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auth.models.User.add_to_class('name', user_name)

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@python_2_unicode_compatible
class DelegationRule(models.Model):
    user = models.ForeignKey(User)
    path = models.CharField(max_length=255)
    project = models.ForeignKey(Project)
    priority = models.IntegerField(default=0)

    def __str__(self):
        return self.path

    class Meta:
        ordering = ['-priority', 'path']
        unique_together = (('path', 'project'))


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@python_2_unicode_compatible
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class UserProfile(models.Model):
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    user = models.OneToOneField(User, unique=True, related_name='profile')
    primary_project = models.ForeignKey(Project, null=True, blank=True)
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    maintainer_projects = models.ManyToManyField(Project,
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             related_name='maintainer_project')
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    send_email = models.BooleanField(default=False,
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             help_text='Selecting this option allows patchwork to send ' +
             'email on your behalf')
    patches_per_page = models.PositiveIntegerField(
            default=100, null=False, blank=False,
            help_text='Number of patches to display per page')
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    def name(self):
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        return user_name(self.user)
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    def contributor_projects(self):
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        submitters = Person.objects.filter(user=self.user)
        return Project.objects.filter(id__in=Patch.objects.filter(
            submitter__in=submitters)
            .values('project_id').query)
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    def sync_person(self):
        pass

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    def n_todo(self):
        return self.todo_patches().count() + self.todo_series().count()
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    def todo_patches(self, project=None):
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        # filter on project, if necessary
        if project:
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            qs = Patch.objects.filter(project=project)
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        else:
            qs = Patch.objects

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        qs = qs.filter(archived=False) \
            .filter(delegate=self.user) \
            .filter(state__in=State.objects.filter(action_required=True)
                    .values('pk').query)
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        return qs

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    def todo_series(self, project=None):
        # filter on project, if necessary
        if project:
            qs = Series.objects.filter(project=project)
        else:
            qs = Series.objects

        qs = qs.filter(reviewer=self.user)
        return qs

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    def __str__(self):
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        return self.name()

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def _user_saved_callback(sender, created, instance, **kwargs):
    try:
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        profile = instance.profile
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    except UserProfile.DoesNotExist:
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        profile = UserProfile(user=instance)
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    profile.save()

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models.signals.post_save.connect(_user_saved_callback, sender=User)

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@python_2_unicode_compatible
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class State(models.Model):
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    name = models.CharField(max_length=100)
    ordering = models.IntegerField(unique=True)
    action_required = models.BooleanField(default=True)
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    def __str__(self):
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        return self.name

    class Meta:
        ordering = ['ordering']

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@add_metaclass(models.SubfieldBase)
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class HashField(models.CharField):
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    def __init__(self, algorithm='sha1', *args, **kwargs):
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        self.algorithm = algorithm
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        try:
            import hashlib
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            def _construct(string=''):
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                if isinstance(string, six.text_type):
                    string = string.encode('utf-8')
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                return hashlib.new(self.algorithm, string)
            self.construct = _construct
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            self.n_bytes = len(hashlib.new(self.algorithm).hexdigest())
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        except ImportError:
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            modules = {'sha1': 'sha', 'md5': 'md5'}
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            if algorithm not in modules:
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                raise NameError("Unknown algorithm '%s'" % algorithm)
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            self.construct = __import__(modules[algorithm]).new

        self.n_bytes = len(self.construct().hexdigest())
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        kwargs['max_length'] = self.n_bytes
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        super(HashField, self).__init__(*args, **kwargs)

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    def db_type(self, connection=None):
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        return 'char(%d)' % self.n_bytes
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@python_2_unicode_compatible
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class Tag(models.Model):
    name = models.CharField(max_length=20)
    pattern = models.CharField(max_length=50,
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            help_text='A simple regex to match the tag in the content of '
                      'a message. Will be used with MULTILINE and IGNORECASE '
                      'flags. eg. ^Acked-by:')
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    abbrev = models.CharField(max_length=2, unique=True,
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            help_text='Short (one-or-two letter) abbreviation for the tag, '
                       'used in table column headers')
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    @property
    def attr_name(self):
        return 'tag_%d_count' % self.id

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    def __str__(self):
        return self.name

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    class Meta:
        ordering = ['abbrev']

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class PatchTag(models.Model):
    patch = models.ForeignKey('Patch')
    tag = models.ForeignKey('Tag')
    count = models.IntegerField(default=1)

    class Meta:
        unique_together = [('patch', 'tag')]

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def get_default_initial_patch_state():
    return State.objects.get(ordering=0)

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class PatchQuerySet(models.query.QuerySet):

    def with_tag_counts(self, project):
        if not project.use_tags:
            return self

        # We need the project's use_tags field loaded for Project.tags().
        # Using prefetch_related means we'll share the one instance of
        # Project, and share the project.tags cache between all patch.project
        # references.
        qs = self.prefetch_related('project')
        select = OrderedDict()
        select_params = []
        for tag in project.tags:
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            select[tag.attr_name] = (
                "coalesce("
                     "(SELECT count FROM patchwork_patchtag "
                     "WHERE patchwork_patchtag.patch_id=patchwork_patch.id "
                     "AND patchwork_patchtag.tag_id=%s), 0)")
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            select_params.append(tag.id)

        return qs.extra(select=select, select_params=select_params)

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class PatchManager(models.Manager):
    use_for_related_fields = True

    def get_queryset(self):
        return PatchQuerySet(self.model, using=self.db)

    def with_tag_counts(self, project):
        return self.get_queryset().with_tag_counts(project)

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def filename(name, ext):
    fname_re = re.compile('[^-_A-Za-z0-9\.]+')
    str = fname_re.sub('-', name)
    return str.strip('-') + ext

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@python_2_unicode_compatible
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class Patch(models.Model):
    project = models.ForeignKey(Project)
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    msgid = models.CharField(max_length=255)
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    name = models.CharField(max_length=255)
    date = models.DateTimeField(default=datetime.datetime.now)
    submitter = models.ForeignKey(Person)
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    delegate = models.ForeignKey(User, blank=True, null=True)
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    state = models.ForeignKey(State, null=True)
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    archived = models.BooleanField(default=False)
    headers = models.TextField(blank=True)
    content = models.TextField(null=True, blank=True)
    pull_url = models.CharField(max_length=255, null=True, blank=True)
    commit_ref = models.CharField(max_length=255, null=True, blank=True)
    hash = HashField(null=True, blank=True)
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    tags = models.ManyToManyField(Tag, through=PatchTag)

    objects = PatchManager()
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    def commit_message(self):
        """Retrieves the commit message"""
        return Comment.objects.filter(patch=self, msgid=self.msgid)

    def answers(self):
        """Retrieves the answers (ie all comments but the commit message)"""
        return Comment.objects.filter(Q(patch=self) & ~Q(msgid=self.msgid))

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    def comments(self):
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        """Retrieves all comments of this patch ie. the commit message and the
           answers"""
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        return Comment.objects.filter(patch=self)
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    def _set_tag(self, tag, count):
        if count == 0:
            self.patchtag_set.filter(tag=tag).delete()
            return
        (patchtag, _) = PatchTag.objects.get_or_create(patch=self, tag=tag)
        if patchtag.count != count:
            patchtag.count = count
            patchtag.save()

    def refresh_tag_counts(self):
        tags = self.project.tags
        counter = Counter()
        for comment in self.comment_set.all():
            counter = counter + extract_tags(comment.content, tags)

        for tag in tags:
            self._set_tag(tag, counter[tag])

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    def save(self):
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        if not hasattr(self, 'state') or not self.state:
            self.state = get_default_initial_patch_state()
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        if self.hash is None and self.content is not None:
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            self.hash = hash_patch(self.content).hexdigest()
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        super(Patch, self).save()

    def is_editable(self, user):
        if not user.is_authenticated():
            return False

        if self.submitter.user == user or self.delegate == user:
            return True

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        return self.project.is_editable(user)
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    def filename(self):
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        return filename(self.name, '.patch')
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    def human_name(self):
        return self.name

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    @models.permalink
    def get_absolute_url(self):
        return ('patchwork.views.patch.patch', (), {'patch_id': self.id})

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    def __str__(self):
        return self.name

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    class Meta:
        verbose_name_plural = 'Patches'
        ordering = ['date']
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        unique_together = [('msgid', 'project')]
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class Comment(models.Model):
    patch = models.ForeignKey(Patch)
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    msgid = models.CharField(max_length=255)
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    submitter = models.ForeignKey(Person)
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    date = models.DateTimeField(default=datetime.datetime.now)
    headers = models.TextField(blank=True)
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    content = models.TextField()

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    response_re = re.compile(
        '^(Tested|Reviewed|Acked|Signed-off|Nacked|Reported)-by: .*$',
        re.M | re.I)
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    def patch_responses(self):
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        return ''.join([match.group(0) + '\n' for match in
                        self.response_re.finditer(self.content)])
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    def save(self, *args, **kwargs):
        super(Comment, self).save(*args, **kwargs)
        self.patch.refresh_tag_counts()

    def delete(self, *args, **kwargs):
        super(Comment, self).delete(*args, **kwargs)
        self.patch.refresh_tag_counts()

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    class Meta:
        ordering = ['date']
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        unique_together = [('msgid', 'patch')]
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class Bundle(models.Model):
    owner = models.ForeignKey(User)
    project = models.ForeignKey(Project)
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    name = models.CharField(max_length=50, null=False, blank=False)
    patches = models.ManyToManyField(Patch, through='BundlePatch')
    public = models.BooleanField(default=False)
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    def n_patches(self):
        return self.patches.all().count()

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    def ordered_patches(self):
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        return self.patches.order_by('bundlepatch__order')
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    def append_patch(self, patch):
        # todo: use the aggregate queries in django 1.1
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        orders = BundlePatch.objects.filter(bundle=self).order_by('-order') \
            .values('order')
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        if len(orders) > 0:
            max_order = orders[0]['order']
        else:
            max_order = 0

        # see if the patch is already in this bundle
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        if BundlePatch.objects.filter(bundle=self, patch=patch).count():
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            raise Exception("patch is already in bundle")
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        bp = BundlePatch.objects.create(bundle=self, patch=patch,
                                        order=max_order + 1)
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        bp.save()

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    def public_url(self):
        if not self.public:
            return None
        site = Site.objects.get_current()
        return 'http://%s%s' % (site.domain,
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                                reverse('patchwork.views.bundle.bundle',
                                        kwargs={
                                            'username': self.owner.username,
                                            'bundlename': self.name
                                        }))
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    @models.permalink
    def get_absolute_url(self):
        return ('patchwork.views.bundle.bundle', (), {
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            'username': self.owner.username,
            'bundlename': self.name,
        })
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    class Meta:
        unique_together = [('owner', 'name')]

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class BundlePatch(models.Model):
    patch = models.ForeignKey(Patch)
    bundle = models.ForeignKey(Bundle)
    order = models.IntegerField()

    class Meta:
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        unique_together = [('bundle', 'patch')]
        ordering = ['order']
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SERIES_DEFAULT_NAME = "Series without cover letter"

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class TestState:
    STATE_PENDING = 0
    STATE_SUCCESS = 1
    STATE_WARNING = 2
    STATE_FAILURE = 3
    STATE_CHOICES = (
        (STATE_PENDING, 'pending'),
        (STATE_SUCCESS, 'success'),
        (STATE_WARNING, 'warning'),
        (STATE_FAILURE, 'failure'),
    )

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    @classmethod
    def from_string(cls, s):
        s2i = {s: i for i, s in cls.STATE_CHOICES}
        return s2i[s]

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# This Model represents the "top level" Series, an object that doesn't change
# with the various versions of patches sent to the mailing list.
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@python_2_unicode_compatible
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class Series(models.Model):
    project = models.ForeignKey(Project)
    name = models.CharField(max_length=200, default=SERIES_DEFAULT_NAME)
    submitter = models.ForeignKey(Person, related_name='submitters')
    reviewer = models.ForeignKey(User, related_name='reviewers', null=True,
                                 blank=True)
    submitted = models.DateTimeField(default=datetime.datetime.now)
    last_updated = models.DateTimeField(auto_now=True)
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    # direct access to the latest revision so we can get the latest revision
    # information with a JOIN
    last_revision = models.OneToOneField('SeriesRevision', null=True,
                                         related_name='+')
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    def revisions(self):
        return SeriesRevision.objects.filter(series=self)

    def latest_revision(self):
        return self.revisions().reverse()[0]

    def get_absolute_url(self):
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        return reverse('series', kwargs={'series': self.pk})
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    def dump(self):
        print('')
        print('===')
        print('Series: %s' % self)
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        print('    version: %d' % self.version)
        print('    n_patches: %d' % self.n_patches)
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        for rev in self.revisions():
            print('    rev %d:' % rev.version)
            i = 1
            for patch in rev.ordered_patches():
                print('        patch %d:' % i)
                print('            subject: %s' % patch.name)
                print('            msgid  : %s' % patch.msgid)
                i += 1

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    def filename(self):
        return filename(self.name, '.mbox')

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    def human_name(self):
        name = self.name
        if name == SERIES_DEFAULT_NAME:
            name = "series starting with " + \
                    self.las_revision.ordered_patches()[0].name
        return name

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    def __str__(self):
        return self.name

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    class Meta:
        verbose_name_plural = 'Series'

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# Signal one can listen to to know when a revision is complete (ie. has all of
# its patches)
series_revision_complete = django.dispatch.Signal(providing_args=["revision"])

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# A 'revision' of a series. Resending a new version of a patch or a full new
# iteration of a series will create a new revision.
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@python_2_unicode_compatible
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class SeriesRevision(models.Model):
    series = models.ForeignKey(Series)
    version = models.IntegerField(default=1)
    root_msgid = models.CharField(max_length=255)
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    cover_letter = models.TextField(null=True, blank=True)
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    n_patches = models.IntegerField(default=0)
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    patches = models.ManyToManyField(Patch, through='SeriesRevisionPatch')
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    test_state = models.SmallIntegerField(choices=TestState.STATE_CHOICES,
                                          null=True)
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    class Meta:
        unique_together = [('series', 'version')]
        ordering = ['version']

    def ordered_patches(self):
        return self.patches.order_by('seriesrevisionpatch__order')

    def add_patch(self, patch, order):
        # see if the patch is already in this revision
        if SeriesRevisionPatch.objects.filter(revision=self,
                                              patch=patch).count():
            raise Exception("patch is already in revision")

        sp = SeriesRevisionPatch.objects.create(revision=self, patch=patch,
                                                order=order)
        sp.save()

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        revision_complete = self.patches.count() == self.n_patches
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        if revision_complete:
            series_revision_complete.send(sender=self.__class__, revision=self)

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    def duplicate_meta(self):
        new = SeriesRevision.objects.get(pk=self.pk)
        new.pk = None
        new.cover_letter = None
        new.version = self.version + 1
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        new.test_state = None
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        new.save()

        return new

    def duplicate(self, exclude_patches=()):
        """Create a new revision based on 'self', incrementing the version
           and populating the new revision with all 'self' patches.
           exclude_patch (a list of 'order's) can be used to exclude
           patches from the operation"""
        new = self.duplicate_meta()
        order = 0
        for p in self.ordered_patches():
            order += 1
            if order in exclude_patches:
                continue
            new.add_patch(p, order)
        return new

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    def refresh_test_state(self):
        results = TestResult.objects.filter(revision=self)
        if results.count() > 0:
            self.test_state = max([r.state for r in results])
            self.save()
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            self.series.save()
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    def human_name(self):
        name = self.series.name
        if name == SERIES_DEFAULT_NAME:
            name = "series starting with " + self.ordered_patches()[0].name
        if self.version > 1:
            name += " (rev%d)" % self.version
        return name

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    def __str__(self):
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        return "Revision " + str(self.version)
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class SeriesRevisionPatch(models.Model):
    patch = models.ForeignKey(Patch)
    revision = models.ForeignKey(SeriesRevision)
    order = models.IntegerField()

    class Meta:
        unique_together = [('revision', 'patch'), ('revision', 'order')]
        ordering = ['order']

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class Event(models.Model):
    name = models.CharField(max_length=20)

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class EventLog(models.Model):
    event = models.ForeignKey(Event)
    event_time = models.DateTimeField(auto_now=True)
    series = models.ForeignKey(Series)
    user = models.ForeignKey(User, null=True)
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    parameters = jsonfield.JSONField(null=True)
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    patch = models.ForeignKey(Patch, null=True)
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    class Meta:
        ordering = ['-event_time']

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@python_2_unicode_compatible
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class Test(models.Model):
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    # no mail, default so test systems/scripts can have a grace period to
    # settle down and give useful results
    RECIPIENT_NONE = 0
    # send mail only to submitter
    RECIPIENT_SUBMITTER = 1
    # send mail to submitter and mailing-list in Cc
    RECIPIENT_MAILING_LIST = 2
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    # send mail to the addresses listed in the mail_to_list field only
    RECIPIENT_TO_LIST = 3
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    RECIPIENT_CHOICES = (
        (RECIPIENT_NONE, 'none'),
        (RECIPIENT_SUBMITTER, 'submitter'),
        (RECIPIENT_MAILING_LIST, 'mailing list'),
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        (RECIPIENT_TO_LIST, 'recipient list'),
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    )

    # send result mail on any state (but pending)
    CONDITION_ALWAYS = 0
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    # send result mail on warning or failure
    CONDITION_ON_WARNING = 1
    # send result mail on error
    CONDITION_ON_FAILURE = 2
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    CONDITION_CHOICES = (
        (CONDITION_ALWAYS, 'always'),
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        (CONDITION_ON_WARNING, 'on warning/failure'),
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        (CONDITION_ON_FAILURE, 'on failure'),
    )

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    project = models.ForeignKey(Project)
    name = models.CharField(max_length=255)
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    mail_recipient = models.SmallIntegerField(choices=RECIPIENT_CHOICES,
                                              default=RECIPIENT_NONE)
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    # email addresses in these lists are always added to the To: and Cc:fields,
    # unless we don't want to send any email at all.
    mail_to_list = models.CharField(max_length=255, blank=True, null=True,
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                                    help_text='Comma separated list of emails')
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    mail_cc_list = models.CharField(max_length=255, blank=True, null=True,
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                                    help_text='Comma separated list of emails')
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    mail_condition = models.SmallIntegerField(choices=CONDITION_CHOICES,
                                              default=CONDITION_ALWAYS)
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    class Meta:
        unique_together = [('project', 'name')]

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    def get_to_list(self):
        return get_comma_separated_field(self.mail_to_list)

    def get_cc_list(self):
        return get_comma_separated_field(self.mail_cc_list)

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    def __str__(self):
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        return self.name

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@python_2_unicode_compatible
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class TestResult(models.Model):

    test = models.ForeignKey(Test)
    revision = models.ForeignKey(SeriesRevision, blank=True, null=True)
    patch = models.ForeignKey(Patch, blank=True, null=True)
    user = models.ForeignKey(User)
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    date = models.DateTimeField(auto_now=True)
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    state = models.SmallIntegerField(choices=TestState.STATE_CHOICES)
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    url = models.URLField(blank=True, null=True)
    summary = models.TextField(blank=True, null=True)

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    def __str__(self):
        return self.get_state_display()

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    class Meta:
        unique_together = [('test', 'revision'), ('test', 'patch')]

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class EmailConfirmation(models.Model):
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    validity = datetime.timedelta(days=settings.CONFIRMATION_VALIDITY_DAYS)
    type = models.CharField(max_length=20, choices=[
        ('userperson', 'User-Person association'),
        ('registration', 'Registration'),
        ('optout', 'Email opt-out'),
    ])
    email = models.CharField(max_length=200)
    user = models.ForeignKey(User, null=True)
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    key = HashField()
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    date = models.DateTimeField(default=datetime.datetime.now)
    active = models.BooleanField(default=True)
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    def deactivate(self):
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        self.active = False
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        self.save()
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    def is_valid(self):
        return self.date + self.validity > datetime.datetime.now()

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    def save(self):
        max = 1 << 32
        if self.key == '':
            str = '%s%s%d' % (self.user, self.email, random.randint(0, max))
            self.key = self._meta.get_field('key').construct(str).hexdigest()
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        super(EmailConfirmation, self).save()
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@python_2_unicode_compatible
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class EmailOptout(models.Model):
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    email = models.CharField(max_length=200, primary_key=True)
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    @classmethod
    def is_optout(cls, email):
        email = email.lower().strip()
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        return cls.objects.filter(email=email).count() > 0
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    def __str__(self):
        return self.email

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class PatchChangeNotification(models.Model):
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    patch = models.OneToOneField(Patch, primary_key=True)
    last_modified = models.DateTimeField(default=datetime.datetime.now)
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    orig_state = models.ForeignKey(State)

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def find_series_for_patch(patch):
    try:
        revision = SeriesRevisionPatch.objects.filter(patch=patch)[0].revision
        return revision.series
    except:
        return None


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def _patch_change_callback(sender, instance, **kwargs):
    # we only want notification of modified patches
    if instance.pk is None:
        return

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    if instance.project is None:
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        return

    try:
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        orig_patch = Patch.objects.get(pk=instance.pk)
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    except Patch.DoesNotExist:
        return

    # If there's no interesting changes, abort without creating the
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    # notification or log
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    if orig_patch.state == instance.state:
        return

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    # If state changed, log the event
    event_state_change = Event.objects.get(name='patch-state-change')
    curr_user = threadlocalrequest.get_current_user()
    previous_state = str(orig_patch.state)
    new_state = str(instance.state)
    changed_patch = Patch.objects.get(pk=instance.pk)

    # Do not log patch-state-change events for Patches that are not part of a
    # Series (ie patches older than the introduction of Series)
    series = find_series_for_patch(orig_patch)
    if series:
        log = EventLog(event=event_state_change,
                      user=curr_user,
                      series_id=series.id,
                      patch=changed_patch,
                      parameters={'previous_state': previous_state,
                                  'new_state': new_state,
                                 })
        log.save()

    if not instance.project.send_notifications:
        return

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    notification = None
    try:
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        notification = PatchChangeNotification.objects.get(patch=instance)
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    except PatchChangeNotification.DoesNotExist:
        pass

    if notification is None:
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        notification = PatchChangeNotification(patch=instance,
                                               orig_state=orig_patch.state)
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    elif notification.orig_state == instance.state:
        # If we're back at the original state, there is no need to notify
        notification.delete()
        return

    notification.last_modified = datetime.datetime.now()
    notification.save()

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models.signals.pre_save.connect(_patch_change_callback, sender=Patch)

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def _on_revision_complete(sender, revision, **kwargs):
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    series = revision.series

    # update series.last_revision
    series.last_revision = series.latest_revision()
    series.save()

    # log event
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    new_revision = Event.objects.get(name='series-new-revision')
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    log = EventLog(event=new_revision, series=series,
                   user=series.submitter.user,
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                   parameters={'revision': revision.version})
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    log.save()

series_revision_complete.connect(_on_revision_complete)