/usr/lib/python2.7/dist-packages/swift/obj/updater.py is in python-swift 2.7.0-0ubuntu2.
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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 six.moves.cPickle as pickle
import os
import signal
import sys
import time
from swift import gettext_ as _
from random import random
from eventlet import spawn, patcher, Timeout
from swift.common.bufferedhttp import http_connect
from swift.common.exceptions import ConnectionTimeout
from swift.common.ring import Ring
from swift.common.utils import get_logger, renamer, write_pickle, \
dump_recon_cache, config_true_value, ismount
from swift.common.daemon import Daemon
from swift.common.storage_policy import split_policy_string, PolicyError
from swift.obj.diskfile import get_tmp_dir, ASYNCDIR_BASE
from swift.common.http import is_success, HTTP_NOT_FOUND, \
HTTP_INTERNAL_SERVER_ERROR
class ObjectUpdater(Daemon):
"""Update object information in container listings."""
def __init__(self, conf, logger=None):
self.conf = conf
self.logger = logger or get_logger(conf, log_route='object-updater')
self.devices = conf.get('devices', '/srv/node')
self.mount_check = config_true_value(conf.get('mount_check', 'true'))
self.swift_dir = conf.get('swift_dir', '/etc/swift')
self.interval = int(conf.get('interval', 300))
self.container_ring = None
self.concurrency = int(conf.get('concurrency', 1))
self.slowdown = float(conf.get('slowdown', 0.01))
self.node_timeout = float(conf.get('node_timeout', 10))
self.conn_timeout = float(conf.get('conn_timeout', 0.5))
self.successes = 0
self.failures = 0
self.recon_cache_path = conf.get('recon_cache_path',
'/var/cache/swift')
self.rcache = os.path.join(self.recon_cache_path, 'object.recon')
def _listdir(self, path):
try:
return os.listdir(path)
except OSError as e:
self.logger.error(_('ERROR: Unable to access %(path)s: '
'%(error)s') %
{'path': path, 'error': e})
return []
def get_container_ring(self):
"""Get the container ring. Load it, if it hasn't been yet."""
if not self.container_ring:
self.container_ring = Ring(self.swift_dir, ring_name='container')
return self.container_ring
def run_forever(self, *args, **kwargs):
"""Run the updater continuously."""
time.sleep(random() * self.interval)
while True:
self.logger.info(_('Begin object update sweep'))
begin = time.time()
pids = []
# read from container ring to ensure it's fresh
self.get_container_ring().get_nodes('')
for device in self._listdir(self.devices):
if self.mount_check and \
not ismount(os.path.join(self.devices, device)):
self.logger.increment('errors')
self.logger.warning(
_('Skipping %s as it is not mounted'), device)
continue
while len(pids) >= self.concurrency:
pids.remove(os.wait()[0])
pid = os.fork()
if pid:
pids.append(pid)
else:
signal.signal(signal.SIGTERM, signal.SIG_DFL)
patcher.monkey_patch(all=False, socket=True, thread=True)
self.successes = 0
self.failures = 0
forkbegin = time.time()
self.object_sweep(os.path.join(self.devices, device))
elapsed = time.time() - forkbegin
self.logger.info(
_('Object update sweep of %(device)s'
' completed: %(elapsed).02fs, %(success)s successes'
', %(fail)s failures'),
{'device': device, 'elapsed': elapsed,
'success': self.successes, 'fail': self.failures})
sys.exit()
while pids:
pids.remove(os.wait()[0])
elapsed = time.time() - begin
self.logger.info(_('Object update sweep completed: %.02fs'),
elapsed)
dump_recon_cache({'object_updater_sweep': elapsed},
self.rcache, self.logger)
if elapsed < self.interval:
time.sleep(self.interval - elapsed)
def run_once(self, *args, **kwargs):
"""Run the updater once."""
self.logger.info(_('Begin object update single threaded sweep'))
begin = time.time()
self.successes = 0
self.failures = 0
for device in self._listdir(self.devices):
if self.mount_check and \
not ismount(os.path.join(self.devices, device)):
self.logger.increment('errors')
self.logger.warning(
_('Skipping %s as it is not mounted'), device)
continue
self.object_sweep(os.path.join(self.devices, device))
elapsed = time.time() - begin
self.logger.info(
_('Object update single threaded sweep completed: '
'%(elapsed).02fs, %(success)s successes, %(fail)s failures'),
{'elapsed': elapsed, 'success': self.successes,
'fail': self.failures})
dump_recon_cache({'object_updater_sweep': elapsed},
self.rcache, self.logger)
def object_sweep(self, device):
"""
If there are async pendings on the device, walk each one and update.
:param device: path to device
"""
start_time = time.time()
# loop through async pending dirs for all policies
for asyncdir in self._listdir(device):
# we only care about directories
async_pending = os.path.join(device, asyncdir)
if not os.path.isdir(async_pending):
continue
if not asyncdir.startswith(ASYNCDIR_BASE):
# skip stuff like "accounts", "containers", etc.
continue
try:
base, policy = split_policy_string(asyncdir)
except PolicyError as e:
self.logger.warning(_('Directory %r does not map '
'to a valid policy (%s)') %
(asyncdir, e))
continue
for prefix in self._listdir(async_pending):
prefix_path = os.path.join(async_pending, prefix)
if not os.path.isdir(prefix_path):
continue
last_obj_hash = None
for update in sorted(self._listdir(prefix_path), reverse=True):
update_path = os.path.join(prefix_path, update)
if not os.path.isfile(update_path):
continue
try:
obj_hash, timestamp = update.split('-')
except ValueError:
self.logger.increment('errors')
self.logger.error(
_('ERROR async pending file with unexpected '
'name %s')
% (update_path))
continue
if obj_hash == last_obj_hash:
self.logger.increment("unlinks")
os.unlink(update_path)
else:
self.process_object_update(update_path, device,
policy)
last_obj_hash = obj_hash
time.sleep(self.slowdown)
try:
os.rmdir(prefix_path)
except OSError:
pass
self.logger.timing_since('timing', start_time)
def process_object_update(self, update_path, device, policy):
"""
Process the object information to be updated and update.
:param update_path: path to pickled object update file
:param device: path to device
:param policy: storage policy of object update
"""
try:
update = pickle.load(open(update_path, 'rb'))
except Exception:
self.logger.exception(
_('ERROR Pickle problem, quarantining %s'), update_path)
self.logger.increment('quarantines')
target_path = os.path.join(device, 'quarantined', 'objects',
os.path.basename(update_path))
renamer(update_path, target_path, fsync=False)
return
successes = update.get('successes', [])
part, nodes = self.get_container_ring().get_nodes(
update['account'], update['container'])
obj = '/%s/%s/%s' % \
(update['account'], update['container'], update['obj'])
headers_out = update['headers'].copy()
headers_out['user-agent'] = 'object-updater %s' % os.getpid()
headers_out.setdefault('X-Backend-Storage-Policy-Index',
str(int(policy)))
events = [spawn(self.object_update,
node, part, update['op'], obj, headers_out)
for node in nodes if node['id'] not in successes]
success = True
new_successes = False
for event in events:
event_success, node_id = event.wait()
if event_success is True:
successes.append(node_id)
new_successes = True
else:
success = False
if success:
self.successes += 1
self.logger.increment('successes')
self.logger.debug('Update sent for %(obj)s %(path)s',
{'obj': obj, 'path': update_path})
self.logger.increment("unlinks")
os.unlink(update_path)
else:
self.failures += 1
self.logger.increment('failures')
self.logger.debug('Update failed for %(obj)s %(path)s',
{'obj': obj, 'path': update_path})
if new_successes:
update['successes'] = successes
write_pickle(update, update_path, os.path.join(
device, get_tmp_dir(policy)))
def object_update(self, node, part, op, obj, headers_out):
"""
Perform the object update to the container
:param node: node dictionary from the container ring
:param part: partition that holds the container
:param op: operation performed (ex: 'PUT' or 'DELETE')
:param obj: object name being updated
:param headers_out: headers to send with the update
"""
try:
with ConnectionTimeout(self.conn_timeout):
conn = http_connect(node['ip'], node['port'], node['device'],
part, op, obj, headers_out)
with Timeout(self.node_timeout):
resp = conn.getresponse()
resp.read()
success = (is_success(resp.status) or
resp.status == HTTP_NOT_FOUND)
return (success, node['id'])
except (Exception, Timeout):
self.logger.exception(_('ERROR with remote server '
'%(ip)s:%(port)s/%(device)s'), node)
return HTTP_INTERNAL_SERVER_ERROR, node['id']
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