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# Copyright (c) 2015 OpenStack Foundation
# All Rights Reserved.
#
# 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 copy
import threading
from requests import exceptions
from oslo_config import cfg
from oslo_log import log as logging
from neutron.db import api as neutron_db_api
from networking_odl.common import client
from networking_odl.common import constants as odl_const
from networking_odl.common import filters
from networking_odl._i18n import _LI, _LE
from networking_odl.db import db
from networking_odl.journal import dependency_validations
LOG = logging.getLogger(__name__)
def call_thread_on_end(func):
def new_func(obj, *args, **kwargs):
return_value = func(obj, *args, **kwargs)
obj.journal.set_sync_event()
return return_value
return new_func
class OpendaylightJournalThread(object):
"""Thread worker for the Opendaylight Journal Database."""
def __init__(self):
self.client = client.OpenDaylightRestClient.create_client()
self._odl_sync_timeout = cfg.CONF.ml2_odl.sync_timeout
self._row_retry_count = cfg.CONF.ml2_odl.retry_count
self.event = threading.Event()
self.lock = threading.Lock()
self._odl_sync_thread = self.start_odl_sync_thread()
self._start_sync_timer()
def start_odl_sync_thread(self):
# Start the sync thread
LOG.debug("Starting a new sync thread")
odl_sync_thread = threading.Thread(
name='sync',
target=self.run_sync_thread)
odl_sync_thread.start()
return odl_sync_thread
def set_sync_event(self):
# Prevent race when starting the timer
with self.lock:
LOG.debug("Resetting thread timer")
self._timer.cancel()
self._start_sync_timer()
self.event.set()
def _start_sync_timer(self):
self._timer = threading.Timer(self._odl_sync_timeout,
self.set_sync_event)
self._timer.start()
def _json_data(self, row):
filter_cls = filters.FILTER_MAP[row.object_type]
url_object = row.object_type.replace('_', '-')
if row.operation == odl_const.ODL_CREATE:
method = 'post'
attr_filter = filter_cls.filter_create_attributes
data = copy.deepcopy(row.data)
urlpath = url_object + 's'
attr_filter(data)
to_send = {row.object_type: data}
elif row.operation == odl_const.ODL_UPDATE:
method = 'put'
attr_filter = filter_cls.filter_update_attributes
data = copy.deepcopy(row.data)
urlpath = url_object + 's/' + row.object_uuid
attr_filter(data)
to_send = {row.object_type: data}
elif row.operation == odl_const.ODL_DELETE:
method = 'delete'
data = None
urlpath = url_object + 's/' + row.object_uuid
to_send = None
elif row.operation == odl_const.ODL_ADD:
method = 'put'
attr_filter = filter_cls.filter_add_attributes
data = copy.deepcopy(row.data)
attr_filter(data)
urlpath = 'routers/' + data['id'] + '/add_router_interface'
to_send = data
elif row.operation == odl_const.ODL_REMOVE:
method = 'put'
attr_filter = filter_cls.filter_remove_attributes
data = copy.deepcopy(row.data)
attr_filter(data)
urlpath = 'routers/' + data['id'] + '/remove_router_interface'
to_send = data
return method, urlpath, to_send
def run_sync_thread(self, exit_after_run=False):
while True:
try:
self.event.wait()
self.event.clear()
session = neutron_db_api.get_session()
self._sync_pending_rows(session, exit_after_run)
LOG.debug("Clearing sync thread event")
if exit_after_run:
# Permanently waiting thread model breaks unit tests
# Adding this arg to exit here only for unit tests
break
except Exception:
# Catch exceptions to protect the thread while running
LOG.exception(_LE("Error on run_sync_thread"))
def _sync_pending_rows(self, session, exit_after_run):
while True:
LOG.debug("Thread walking database")
row = db.get_oldest_pending_db_row_with_lock(session)
if not row:
LOG.debug("No rows to sync")
break
# Validate the operation
validate_func = (dependency_validations.
VALIDATION_MAP[row.object_type])
valid = validate_func(session, row)
if not valid:
LOG.info(_LI("%(operation)s %(type)s %(uuid)s is not a "
"valid operation yet, skipping for now"),
{'operation': row.operation,
'type': row.object_type,
'uuid': row.object_uuid})
# Set row back to pending.
db.update_db_row_state(session, row, odl_const.PENDING)
if exit_after_run:
break
continue
LOG.info(_LI("Syncing %(operation)s %(type)s %(uuid)s"),
{'operation': row.operation, 'type': row.object_type,
'uuid': row.object_uuid})
# Add code to sync this to ODL
method, urlpath, to_send = self._json_data(row)
try:
self.client.sendjson(method, urlpath, to_send)
db.update_db_row_state(session, row, odl_const.COMPLETED)
except exceptions.ConnectionError as e:
# Don't raise the retry count, just log an error
LOG.error(_LE("Cannot connect to the Opendaylight Controller"))
# Set row back to pending
db.update_db_row_state(session, row, odl_const.PENDING)
# Break our of the loop and retry with the next
# timer interval
break
except Exception as e:
LOG.error(_LE("Error syncing %(type)s %(operation)s,"
" id %(uuid)s Error: %(error)s"),
{'type': row.object_type,
'uuid': row.object_uuid,
'operation': row.operation,
'error': e.message})
db.update_pending_db_row_retry(session, row,
self._row_retry_count)
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