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# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import atexit
import os
import threading
import glance_store
from oslo_config import cfg
from oslo_log import log as logging
import osprofiler.initializer
from glance.api import common
import glance.async_
from glance.common import config
from glance.common import store_utils
from glance import housekeeping
from glance.i18n import _
from glance import notifier
CONF = cfg.CONF
CONF.import_group("profiler", "glance.common.wsgi")
CONF.import_opt("enabled_backends", "glance.common.wsgi")
logging.register_options(CONF)
LOG = logging.getLogger(__name__)
# Detect if we're running under the uwsgi server
try:
import uwsgi
LOG.debug('Detected running under uwsgi')
except ImportError:
LOG.debug('Detected not running under uwsgi')
uwsgi = None
CONFIG_FILES = ['glance-api-paste.ini',
'glance-image-import.conf',
'glance-api.conf']
# Reserved file stores for staging and tasks operations
RESERVED_STORES = {
'os_glance_staging_store': 'file',
'os_glance_tasks_store': 'file'
}
def _get_config_files(env=None):
if env is None:
env = os.environ
dirname = env.get('OS_GLANCE_CONFIG_DIR', '/etc/glance').strip()
config_files = []
for config_file in CONFIG_FILES:
cfg_file = os.path.join(dirname, config_file)
# As 'glance-image-import.conf' is optional conf file
# so include it only if it's existing.
if config_file == 'glance-image-import.conf' and (
not os.path.exists(cfg_file)):
continue
config_files.append(cfg_file)
return config_files
def _setup_os_profiler():
notifier.set_defaults()
if CONF.profiler.enabled:
osprofiler.initializer.init_from_conf(conf=CONF,
context={},
project='glance',
service='api',
host=CONF.bind_host)
def drain_workers():
# NOTE(danms): If there are any other named pools that we need to
# drain before exit, they should be in this list.
pools_to_drain = ['tasks_pool']
for pool_name in pools_to_drain:
pool_model = common.get_thread_pool(pool_name)
LOG.info('Waiting for remaining threads in pool %r', pool_name)
pool_model.pool.shutdown()
from glance.api.v2 import cached_images # noqa
if cached_images.WORKER:
# If we started a cache worker, signal it to exit
# and wait until it does.
cached_images.WORKER.terminate()
def run_staging_cleanup():
cleaner = housekeeping.StagingStoreCleaner(glance.db.get_api())
# NOTE(danms): Start thread as a daemon. It is still a
# single-shot, but this will not block our shutdown if it is
# running.
cleanup_thread = threading.Thread(
target=cleaner.clean_orphaned_staging_residue,
daemon=True)
cleanup_thread.start()
def init_app():
config.set_config_defaults()
config_files = _get_config_files()
CONF([], project='glance', default_config_files=config_files)
logging.setup(CONF, "glance")
# NOTE(danms): We are running inside uwsgi or mod_wsgi, so no eventlet;
# use native threading instead.
glance.async_.set_threadpool_model('native')
if uwsgi:
uwsgi.atexit = drain_workers
else:
atexit.register(drain_workers)
# NOTE(danms): Change the default threadpool size since we
# are dealing with native threads and not greenthreads.
# Right now, the only pool of default size is tasks_pool,
# so if others are created this will need to change to be
# more specific.
common.DEFAULT_POOL_SIZE = CONF.wsgi.task_pool_threads
if CONF.enabled_backends:
if store_utils.check_reserved_stores(CONF.enabled_backends):
msg = _("'os_glance_' prefix should not be used in "
"enabled_backends config option. It is reserved "
"for internal use only.")
raise RuntimeError(msg)
glance_store.register_store_opts(CONF, reserved_stores=RESERVED_STORES)
glance_store.create_multi_stores(CONF, reserved_stores=RESERVED_STORES)
glance_store.verify_store()
else:
glance_store.register_opts(CONF)
glance_store.create_stores(CONF)
glance_store.verify_default_store()
run_staging_cleanup()
_setup_os_profiler()
return config.load_paste_app('glance-api')
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