207 lines
7.4 KiB
Python
207 lines
7.4 KiB
Python
# Copyright (c) 2015 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from six.moves import queue as Queue
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import time
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from oslo_config import cfg
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from oslo_log import log as logging
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from oslo_utils import excutils
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from ovs.db import idl
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from neutron.agent.ovsdb import api
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from neutron.agent.ovsdb.native import commands as cmd
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from neutron.agent.ovsdb.native import connection
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from neutron.agent.ovsdb.native import helpers
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from neutron.agent.ovsdb.native import idlutils
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from neutron.i18n import _LE
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OPTS = [
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cfg.StrOpt('ovsdb_connection',
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default='tcp:127.0.0.1:6640',
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help=_('The connection string for the native OVSDB backend')),
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]
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cfg.CONF.register_opts(OPTS, 'OVS')
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# TODO(twilson) DEFAULT.ovs_vsctl_timeout should be OVS.vsctl_timeout
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cfg.CONF.import_opt('ovs_vsctl_timeout', 'neutron.agent.common.ovs_lib')
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LOG = logging.getLogger(__name__)
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class Transaction(api.Transaction):
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def __init__(self, api, ovsdb_connection, timeout,
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check_error=False, log_errors=False):
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self.api = api
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self.check_error = check_error
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self.log_errors = log_errors
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self.commands = []
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self.results = Queue.Queue(1)
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self.ovsdb_connection = ovsdb_connection
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self.timeout = timeout
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def add(self, command):
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"""Add a command to the transaction
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returns The command passed as a convenience
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"""
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self.commands.append(command)
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return command
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def commit(self):
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self.ovsdb_connection.queue_txn(self)
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result = self.results.get()
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if self.check_error:
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if isinstance(result, idlutils.ExceptionResult):
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if self.log_errors:
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LOG.error(result.tb)
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raise result.ex
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return result
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def do_commit(self):
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start_time = time.time()
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attempts = 0
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while True:
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elapsed_time = time.time() - start_time
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if attempts > 0 and elapsed_time > self.timeout:
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raise RuntimeError("OVS transaction timed out")
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attempts += 1
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# TODO(twilson) Make sure we don't loop longer than vsctl_timeout
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txn = idl.Transaction(self.api.idl)
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for i, command in enumerate(self.commands):
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LOG.debug("Running txn command(idx=%(idx)s): %(cmd)s",
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{'idx': i, 'cmd': command})
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try:
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command.run_idl(txn)
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except Exception:
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with excutils.save_and_reraise_exception() as ctx:
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txn.abort()
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if not self.check_error:
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ctx.reraise = False
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seqno = self.api.idl.change_seqno
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status = txn.commit_block()
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if status == txn.TRY_AGAIN:
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LOG.debug("OVSDB transaction returned TRY_AGAIN, retrying")
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idlutils.wait_for_change(
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self.api.idl, self.timeout - elapsed_time,
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seqno)
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continue
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elif status == txn.ERROR:
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msg = _LE("OVSDB Error: %s") % txn.get_error()
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if self.log_errors:
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LOG.error(msg)
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if self.check_error:
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# For now, raise similar error to vsctl/utils.execute()
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raise RuntimeError(msg)
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return
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elif status == txn.ABORTED:
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LOG.debug("Transaction aborted")
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return
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elif status == txn.UNCHANGED:
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LOG.debug("Transaction caused no change")
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return [cmd.result for cmd in self.commands]
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class OvsdbIdl(api.API):
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ovsdb_connection = connection.Connection(cfg.CONF.OVS.ovsdb_connection,
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cfg.CONF.ovs_vsctl_timeout,
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'Open_vSwitch')
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def __init__(self, context):
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super(OvsdbIdl, self).__init__(context)
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# it's a chicken and egg problem: by default, the manager that
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# corresponds to the connection URI is in most cases not enabled in
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# local ovsdb, so we still need ovs-vsctl to set it to allow
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# connections
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helpers.enable_connection_uri(self.ovsdb_connection.connection)
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OvsdbIdl.ovsdb_connection.start()
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self.idl = OvsdbIdl.ovsdb_connection.idl
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@property
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def _tables(self):
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return self.idl.tables
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@property
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def _ovs(self):
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return list(self._tables['Open_vSwitch'].rows.values())[0]
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def transaction(self, check_error=False, log_errors=True, **kwargs):
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return Transaction(self, OvsdbIdl.ovsdb_connection,
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self.context.vsctl_timeout,
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check_error, log_errors)
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def add_br(self, name, may_exist=True):
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return cmd.AddBridgeCommand(self, name, may_exist)
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def del_br(self, name, if_exists=True):
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return cmd.DelBridgeCommand(self, name, if_exists)
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def br_exists(self, name):
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return cmd.BridgeExistsCommand(self, name)
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def port_to_br(self, name):
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return cmd.PortToBridgeCommand(self, name)
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def iface_to_br(self, name):
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# For our purposes, ports and interfaces always have the same name
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return cmd.PortToBridgeCommand(self, name)
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def list_br(self):
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return cmd.ListBridgesCommand(self)
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def br_get_external_id(self, name, field):
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return cmd.BrGetExternalIdCommand(self, name, field)
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def br_set_external_id(self, name, field, value):
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return cmd.BrSetExternalIdCommand(self, name, field, value)
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def db_set(self, table, record, *col_values):
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return cmd.DbSetCommand(self, table, record, *col_values)
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def db_clear(self, table, record, column):
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return cmd.DbClearCommand(self, table, record, column)
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def db_get(self, table, record, column):
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return cmd.DbGetCommand(self, table, record, column)
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def db_list(self, table, records=None, columns=None, if_exists=False):
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return cmd.DbListCommand(self, table, records, columns, if_exists)
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def db_find(self, table, *conditions, **kwargs):
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return cmd.DbFindCommand(self, table, *conditions, **kwargs)
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def set_controller(self, bridge, controllers):
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return cmd.SetControllerCommand(self, bridge, controllers)
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def del_controller(self, bridge):
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return cmd.DelControllerCommand(self, bridge)
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def get_controller(self, bridge):
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return cmd.GetControllerCommand(self, bridge)
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def set_fail_mode(self, bridge, mode):
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return cmd.SetFailModeCommand(self, bridge, mode)
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def add_port(self, bridge, port, may_exist=True):
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return cmd.AddPortCommand(self, bridge, port, may_exist)
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def del_port(self, port, bridge=None, if_exists=True):
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return cmd.DelPortCommand(self, port, bridge, if_exists)
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def list_ports(self, bridge):
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return cmd.ListPortsCommand(self, bridge)
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