Organizations: move signals

readthedocs/organizations/__init__.py

@@ -0,0 +1 @@
+default_app_config = 'readthedocs.organizations.apps.OrganizationsConfig'

readthedocs/organizations/apps.py

@@ -6,3 +6,6 @@
 class OrganizationsConfig(AppConfig):
 
     name = 'readthedocs.organizations'
+
+    def ready(self):
+        import readthedocs.organizations.signals  # noqa

readthedocs/organizations/signals.py

@@ -0,0 +1,76 @@
+"""Organization signals."""
+
+import logging
+
+from allauth.account.signals import user_signed_up
+from django.db.models import Count
+from django.db.models.signals import pre_delete
+from django.dispatch import receiver
+
+from readthedocs.builds.models import Version
+from readthedocs.organizations.models import (
+    Organization,
+    Team,
+    TeamInvite,
+    TeamMember,
+)
+from readthedocs.projects.models import Project
+
+log = logging.getLogger(__name__)
+
+
+# pylint: disable=unused-argument
+@receiver(user_signed_up)
+def attach_org(sender, request, user, **kwargs):
+    """Attach invited user to organization."""
+    team_slug = request.session.get('team')
+    if team_slug:
+        team = Team.objects.get(slug=team_slug)
+        TeamMember.objects.create(team=team, member=user)
+
+
+# pylint: disable=unused-argument
+@receiver(pre_delete, sender=Organization)
+def remove_organization_completely(sender, instance, using, **kwargs):
+    """
+    Remove Organization leaf-overs.
+
+    This includes:
+
+    - Projects
+    - Versions
+    - Builds (deleted on cascade)
+    - Teams
+    - Team Invitations
+    - Team Memberships
+    - Artifacts (HTML, PDF, etc)
+    """
+    organization = instance
+    log.info('Removing Organization %s completely', organization.slug)
+
+    # ``Project`` has a ManyToMany relationship with ``Organization``. We need
+    # to be sure that the projects we are deleting here belongs only to the
+    # organization deleted
+    projects = Project.objects.annotate(
+        Count('organizations'),
+    ).filter(
+        organizations__in=[organization],
+        organizations__count=1,
+    )
+
+    versions = Version.objects.filter(project__in=projects)
+    teams = Team.objects.filter(organization=organization)
+    team_invites = TeamInvite.objects.filter(organization=organization)
+    team_memberships = TeamMember.objects.filter(team__in=teams)
+
+    # Bulk delete
+    team_memberships.delete()
+    team_invites.delete()
+    teams.delete()
+
+    # Granular delete that trigger other complex tasks
+    for version in versions:
+        # Triggers a task to remove artifacts from storage
+        version.delete()
+
+    projects.delete()