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Refactor userdbs app to use signals 

This commit isolates the celery task invocations of the userdbs app into
signal handlers. All celery interaction is now asynchronously handled in
userdbs.signals.
This commit is contained in:
Jan Dittberner 2015-12-07 00:23:07 +00:00
parent 1649e4592e
commit c9a9fa11b2
4 changed files with 208 additions and 91 deletions
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6
gnuviechadmin/userdbs/admin.py
View File

@ -170,7 +170,7 @@ class DatabaseUserAdmin(admin.ModelAdmin):
"""
actions = super(DatabaseUserAdmin, self).get_actions(request)
if 'delete_selected' in actions:
if 'delete_selected' in actions: # pragma: no cover
del actions['delete_selected']
return actions
@ -250,8 +250,6 @@ class UserDatabaseAdmin(admin.ModelAdmin):
databases
"""
for dbuser in queryset.all():
dbuser.delete()
for database in queryset.all():
database.delete()
perform_delete_selected.short_description = _(
@ -270,7 +268,7 @@ class UserDatabaseAdmin(admin.ModelAdmin):
"""
actions = super(UserDatabaseAdmin, self).get_actions(request)
if 'delete_selected' in actions:
if 'delete_selected' in actions: # pragma: no cover
del actions['delete_selected']
return actions

8
gnuviechadmin/userdbs/apps.py
View File

@ -16,3 +16,11 @@ class UserdbsAppConfig(AppConfig):
"""
name = 'userdbs'
verbose_name = _('Database Users and their Databases')
def ready(self):
"""
Takes care of importing the signal handlers of the :py:mod:`userdbs`
app.
"""
import userdbs.signals # NOQA

95
gnuviechadmin/userdbs/models.py
View File

@ -1,33 +1,14 @@
from __future__ import unicode_literals
from django.db import models
from django.db import transaction
from django.db import models, transaction
from django.dispatch import Signal
from django.utils.encoding import python_2_unicode_compatible
from django.utils.translation import ugettext as _
from model_utils import Choices
from model_utils.models import TimeStampedModel
from passlib.utils import generate_password
from osusers.models import User as OsUser
from mysqltasks.tasks import (
create_mysql_database,
create_mysql_user,
delete_mysql_database,
delete_mysql_user,
set_mysql_userpassword,
)
from pgsqltasks.tasks import (
create_pgsql_database,
create_pgsql_user,
delete_pgsql_database,
delete_pgsql_user,
set_pgsql_userpassword,
)
DB_TYPES = Choices(
(0, 'pgsql', _('PostgreSQL')),
(1, 'mysql', _('MySQL')),
@ -37,6 +18,9 @@ Database type choice enumeration.
"""
password_set = Signal(providing_args=['instance', 'password'])
class DatabaseUserManager(models.Manager):
"""
Default Manager for :py:class:`userdbs.models.DatabaseUser`.
@ -93,7 +77,6 @@ class DatabaseUserManager(models.Manager):
db_user = DatabaseUser(
osuser=osuser, db_type=db_type, name=username)
if commit:
db_user.create_in_database(password=password)
db_user.save()
return db_user
@ -120,34 +103,15 @@ class DatabaseUser(TimeStampedModel, models.Model):
'osuser': self.osuser.username,
}
def create_in_database(self, password=None):
"""
Create this user in the target database.
:param str password: initial password for the database user
"""
if password is None:
password = generate_password()
# TODO: send GPG encrypted mail with this information
if self.db_type == DB_TYPES.pgsql:
create_pgsql_user.delay(self.name, password).get()
elif self.db_type == DB_TYPES.mysql:
create_mysql_user.delay(self.name, password).get()
else:
raise ValueError('Unknown database type %d' % self.db_type)
@transaction.atomic
def set_password(self, password):
"""
Set an existing user's password.
:param str password: new password for the database user
"""
if self.db_type == DB_TYPES.pgsql:
set_pgsql_userpassword.delay(self.name, password).get(timeout=5)
elif self.db_type == DB_TYPES.mysql:
set_mysql_userpassword.delay(self.name, password).get(timeout=5)
else:
raise ValueError('Unknown database type %d' % self.db_type)
password_set.send(
sender=self.__class__, password=password, instance=self)
@transaction.atomic
def delete(self, *args, **kwargs):
@ -163,12 +127,6 @@ class DatabaseUser(TimeStampedModel, models.Model):
"""
for database in self.userdatabase_set.all():
database.delete()
if self.db_type == DB_TYPES.pgsql:
delete_pgsql_user.delay(self.name).get(propagate=False, timeout=5)
elif self.db_type == DB_TYPES.mysql:
delete_mysql_user.delay(self.name).get(propagate=False, timeout=5)
else:
raise ValueError('Unknown database type %d' % self.db_type)
super(DatabaseUser, self).delete(*args, **kwargs)
@ -236,7 +194,6 @@ class UserDatabaseManager(models.Manager):
db_name = self._get_next_dbname(db_user)
database = UserDatabase(db_user=db_user, db_name=db_name)
if commit:
database.create_in_database()
database.save()
return database
@ -260,39 +217,3 @@ class UserDatabase(TimeStampedModel, models.Model):
'db_name': self.db_name,
'db_user': self.db_user,
}
def create_in_database(self):
"""
Create this database (schema) in the target database.
"""
# TODO: send GPG encrypted mail with this information
if self.db_user.db_type == DB_TYPES.pgsql:
create_pgsql_database.delay(self.db_name, self.db_user.name).get()
elif self.db_user.db_type == DB_TYPES.mysql:
create_mysql_database.delay(self.db_name, self.db_user.name).get()
else:
raise ValueError('Unknown database type %d' % self.db_type)
@transaction.atomic
def delete(self, *args, **kwargs):
"""
Delete the database (schema) from the target database and the Django
database.
:param args: positional arguments for
:py:meth:`django.db.models.Model.delete`
:param kwargs: keyword arguments for
:py:meth:`django.db.models.Model.delete`
"""
db_user = self.db_user
if db_user.db_type == DB_TYPES.pgsql:
delete_pgsql_database.delay(self.db_name).get()
elif db_user.db_type == DB_TYPES.mysql:
delete_mysql_database.delay(self.db_name, db_user.name).get()
else:
raise ValueError('Unknown database type %d' % self.db_type)
super(UserDatabase, self).delete(*args, **kwargs)
if not db_user.userdatabase_set.exists():
db_user.delete()

190
gnuviechadmin/userdbs/signals.py Normal file
View File

@ -0,0 +1,190 @@
"""
This module contains the signal handlers of the :py:mod:`userdbs` app.
"""
from __future__ import unicode_literals
import logging
from django.db.models.signals import post_delete, post_save
from django.dispatch import receiver
from passlib.utils import generate_password
from mysqltasks.tasks import (create_mysql_database, create_mysql_user,
delete_mysql_database, delete_mysql_user,
set_mysql_userpassword)
from pgsqltasks.tasks import (create_pgsql_database, create_pgsql_user,
delete_pgsql_database, delete_pgsql_user,
set_pgsql_userpassword)
from taskresults.models import TaskResult
from .models import DB_TYPES, DatabaseUser, UserDatabase, password_set
_LOGGER = logging.getLogger(__name__)
@receiver(password_set, sender=DatabaseUser)
def handle_dbuser_password_set(sender, instance, password, **kwargs):
"""
Signal handler triggered by password changes for
:py:class:`userdbs.models.DatabaseUser` instances.
"""
if instance.db_type == DB_TYPES.mysql:
taskresult = TaskResult.objects.create_task_result(
'handle_dbuser_password_set',
set_mysql_userpassword.s(instance.name, password),
'mysql password change')
_LOGGER.info(
'MySQL password change has been requested in task %s',
taskresult.task_id)
elif instance.db_type == DB_TYPES.pgsql:
taskresult = TaskResult.objects.create_task_result(
'handle_dbuser_password_set',
set_pgsql_userpassword.s(instance.name, password),
'pgsql password change')
_LOGGER.info(
'PostgreSQL password change has been requested in task %s',
taskresult.task_id)
else:
_LOGGER.warning(
'Password change has been requested for unknown database %s'
' the request has been ignored.',
instance.db_type)
@receiver(post_save, sender=DatabaseUser)
def handle_dbuser_created(sender, instance, created, **kwargs):
"""
Signal handler triggered after the creation of or updates to
:py:class:`userdbs.models.DatabaseUser` instances.
"""
if created:
password = kwargs.get('password', generate_password())
# TODO: send GPG encrypted mail with this information
if instance.db_type == DB_TYPES.mysql:
taskresult = TaskResult.objects.create_task_result(
'handle_dbuser_created',
create_mysql_user.s(instance.name, password),
'mysql user creation')
_LOGGER.info(
'A new MySQL user %s creation has been requested in task %s',
instance.name, taskresult.task_id)
elif instance.db_type == DB_TYPES.pgsql:
taskresult = TaskResult.objects.create_task_result(
'handle_dbuser_created',
create_pgsql_user.s(instance.name, password),
'pgsql user creation')
_LOGGER.info(
'A new PostgreSQL user %s creation has been requested in task'
' %s',
instance.name, taskresult.task_id)
else:
_LOGGER.warning(
'created DatabaseUser for unknown database type %s',
instance.db_type)
_LOGGER.debug(
'database user %s has been %s',
instance, created and "created" or "updated")
@receiver(post_delete, sender=DatabaseUser)
def handle_dbuser_deleted(sender, instance, **kwargs):
"""
Signal handler triggered after the deletion of
:py:class:`userdbs.models.DatabaseUser` instances.
"""
if instance.db_type == DB_TYPES.mysql:
taskresult = TaskResult.objects.create_task_result(
'handle_dbuser_deleted',
delete_mysql_user.s(instance.name),
'mysql user deletion')
_LOGGER.info(
'MySQL user %s deletion has been requested in task %s',
instance.name, taskresult.task_id)
elif instance.db_type == DB_TYPES.pgsql:
taskresult = TaskResult.objects.create_task_result(
'handle_dbuser_deleted',
delete_pgsql_user.s(instance.name),
'pgsql user deletion')
_LOGGER.info(
'PostgreSQL user %s deletion has been requested in task %s',
instance.name, taskresult.task_id)
else:
_LOGGER.warning(
'deleted DatabaseUser %s for unknown database type %s',
instance.name, instance.db_type)
_LOGGER.debug(
'database user %s has been deleted', instance)
@receiver(post_save, sender=UserDatabase)
def handle_userdb_created(sender, instance, created, **kwargs):
"""
Signal handler triggered after the creation of or updates to
:py:class:`userdbs.models.UserDatabase` instances.
"""
if created:
if instance.db_user.db_type == DB_TYPES.mysql:
taskresult = TaskResult.objects.create_task_result(
'handle_userdb_created',
create_mysql_database.s(
instance.db_name, instance.db_user.name),
'mysql database creation')
_LOGGER.info(
'The creation of a new MySQL database %s has been requested in'
' task %s',
instance.db_name, taskresult.task_id)
elif instance.db_user.db_type == DB_TYPES.pgsql:
taskresult = TaskResult.objects.create_task_result(
'handle_userdb_created',
create_pgsql_database.s(
instance.db_name, instance.db_user.name),
'pgsql database creation')
_LOGGER.info(
'The creation of a new PostgreSQL database %s has been'
' requested in task %s',
instance.db_name, taskresult.task_id)
else:
_LOGGER.warning(
'created UserDatabase for unknown database type %s',
instance.db_user.db_type)
_LOGGER.debug(
'database %s has been %s',
instance, created and "created" or "updated")
@receiver(post_delete, sender=UserDatabase)
def handle_userdb_deleted(sender, instance, **kwargs):
"""
Signal handler triggered after the deletion of
:py:class:`userdbs.models.UserDatabase` instances.
"""
if instance.db_user.db_type == DB_TYPES.mysql:
taskresult = TaskResult.objects.create_task_result(
'handle_userdb_deleted',
delete_mysql_database.s(instance.db_name, instance.db_user.name),
'mysql database deletion')
_LOGGER.info(
'The deletion of MySQL database %s has been requested in task %s',
instance.db_name, taskresult.task_id)
elif instance.db_user.db_type == DB_TYPES.pgsql:
taskresult = TaskResult.objects.create_task_result(
'handle_userdb_deleted',
delete_pgsql_database.s(instance.db_name),
'pgsql database deletion')
_LOGGER.info(
'The deletion of PostgreSQL database %s has been requested in '
' task %s',
instance.db_name, taskresult.task_id)
else:
_LOGGER.warning(
'deleted UserDatabase %s of unknown type %s',
instance.db_name, instance.db_type)
pass
_LOGGER.debug(
'database %s has been deleted', instance)