/usr/lib/python2.7/dist-packages/celery/fixups/django.py is in python-celery 4.1.0-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | """Django-specific customization."""
from __future__ import absolute_import, unicode_literals
import os
import sys
import warnings
from kombu.utils.imports import symbol_by_name
from kombu.utils.objects import cached_property
from datetime import datetime
from importlib import import_module
from celery import _state
from celery import signals
from celery.exceptions import FixupWarning, ImproperlyConfigured
__all__ = ['DjangoFixup', 'fixup']
ERR_NOT_INSTALLED = """\
Environment variable DJANGO_SETTINGS_MODULE is defined
but Django isn't installed. Won't apply Django fix-ups!
"""
def _maybe_close_fd(fh):
try:
os.close(fh.fileno())
except (AttributeError, OSError, TypeError):
# TypeError added for celery#962
pass
def _verify_django_version(django):
if django.VERSION < (1, 8):
raise ImproperlyConfigured('Celery 4.x requires Django 1.8 or later.')
def fixup(app, env='DJANGO_SETTINGS_MODULE'):
"""Install Django fixup if settings module environment is set."""
SETTINGS_MODULE = os.environ.get(env)
if SETTINGS_MODULE and 'django' not in app.loader_cls.lower():
try:
import django # noqa
except ImportError:
warnings.warn(FixupWarning(ERR_NOT_INSTALLED))
else:
_verify_django_version(django)
return DjangoFixup(app).install()
class DjangoFixup(object):
"""Fixup installed when using Django."""
def __init__(self, app):
self.app = app
if _state.default_app is None:
self.app.set_default()
self._worker_fixup = None
def install(self):
# Need to add project directory to path
sys.path.append(os.getcwd())
self._settings = symbol_by_name('django.conf:settings')
self.app.loader.now = self.now
signals.import_modules.connect(self.on_import_modules)
signals.worker_init.connect(self.on_worker_init)
return self
@property
def worker_fixup(self):
if self._worker_fixup is None:
self._worker_fixup = DjangoWorkerFixup(self.app)
return self._worker_fixup
@worker_fixup.setter
def worker_fixup(self, value):
self._worker_fixup = value
def on_import_modules(self, **kwargs):
# call django.setup() before task modules are imported
self.worker_fixup.validate_models()
def on_worker_init(self, **kwargs):
self.worker_fixup.install()
def now(self, utc=False):
return datetime.utcnow() if utc else self._now()
def autodiscover_tasks(self):
from django.apps import apps
return [config.name for config in apps.get_app_configs()]
@cached_property
def _now(self):
return symbol_by_name('django.utils.timezone:now')
class DjangoWorkerFixup(object):
_db_recycles = 0
def __init__(self, app):
self.app = app
self.db_reuse_max = self.app.conf.get('CELERY_DB_REUSE_MAX', None)
self._db = import_module('django.db')
self._cache = import_module('django.core.cache')
self._settings = symbol_by_name('django.conf:settings')
self.interface_errors = (
symbol_by_name('django.db.utils.InterfaceError'),
)
self.DatabaseError = symbol_by_name('django.db:DatabaseError')
def django_setup(self):
import django
django.setup()
def validate_models(self):
from django.core.checks import run_checks
self.django_setup()
run_checks()
def install(self):
signals.beat_embedded_init.connect(self.close_database)
signals.worker_ready.connect(self.on_worker_ready)
signals.task_prerun.connect(self.on_task_prerun)
signals.task_postrun.connect(self.on_task_postrun)
signals.worker_process_init.connect(self.on_worker_process_init)
self.close_database()
self.close_cache()
return self
def on_worker_process_init(self, **kwargs):
# Child process must validate models again if on Windows,
# or if they were started using execv.
if os.environ.get('FORKED_BY_MULTIPROCESSING'):
self.validate_models()
# close connections:
# the parent process may have established these,
# so need to close them.
# calling db.close() on some DB connections will cause
# the inherited DB conn to also get broken in the parent
# process so we need to remove it without triggering any
# network IO that close() might cause.
for c in self._db.connections.all():
if c and c.connection:
self._maybe_close_db_fd(c.connection)
# use the _ version to avoid DB_REUSE preventing the conn.close() call
self._close_database()
self.close_cache()
def _maybe_close_db_fd(self, fd):
try:
_maybe_close_fd(fd)
except self.interface_errors:
pass
def on_task_prerun(self, sender, **kwargs):
"""Called before every task."""
if not getattr(sender.request, 'is_eager', False):
self.close_database()
def on_task_postrun(self, sender, **kwargs):
# See https://groups.google.com/group/django-users/
# browse_thread/thread/78200863d0c07c6d/
if not getattr(sender.request, 'is_eager', False):
self.close_database()
self.close_cache()
def close_database(self, **kwargs):
if not self.db_reuse_max:
return self._close_database()
if self._db_recycles >= self.db_reuse_max * 2:
self._db_recycles = 0
self._close_database()
self._db_recycles += 1
def _close_database(self):
for conn in self._db.connections.all():
try:
conn.close()
except self.interface_errors:
pass
except self.DatabaseError as exc:
str_exc = str(exc)
if 'closed' not in str_exc and 'not connected' not in str_exc:
raise
def close_cache(self):
try:
self._cache.cache.close()
except (TypeError, AttributeError):
pass
def on_worker_ready(self, **kwargs):
if self._settings.DEBUG:
warnings.warn('Using settings.DEBUG leads to a memory leak, never '
'use this setting in production environments!')
|