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commands.py
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commands.py
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# Copyright (c) 2015 Openstack Foundation
#
# 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 collections
from oslo_log import log as logging
from oslo_utils import excutils
from neutron.agent.ovsdb import api
from neutron.agent.ovsdb.native import idlutils
from neutron.i18n import _LE
LOG = logging.getLogger(__name__)
class BaseCommand(api.Command):
def __init__(self, api):
self.api = api
self.result = None
def execute(self, check_error=False, log_errors=True):
try:
with self.api.transaction(check_error, log_errors) as txn:
txn.add(self)
return self.result
except Exception:
with excutils.save_and_reraise_exception() as ctx:
if log_errors:
LOG.exception(_LE("Error executing command"))
if not check_error:
ctx.reraise = False
def __str__(self):
command_info = self.__dict__
return "%s(%s)" % (
self.__class__.__name__,
", ".join("%s=%s" % (k, v) for k, v in command_info.items()
if k not in ['api', 'result']))
class AddBridgeCommand(BaseCommand):
def __init__(self, api, name, may_exist, datapath_type):
super(AddBridgeCommand, self).__init__(api)
self.name = name
self.may_exist = may_exist
self.datapath_type = datapath_type
def run_idl(self, txn):
if self.may_exist:
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name',
self.name, None)
if br:
return
row = txn.insert(self.api._tables['Bridge'])
row.name = self.name
if self.datapath_type:
row.datapath_type = self.datapath_type
self.api._ovs.verify('bridges')
self.api._ovs.bridges = self.api._ovs.bridges + [row]
# Add the internal bridge port
cmd = AddPortCommand(self.api, self.name, self.name, self.may_exist)
cmd.run_idl(txn)
cmd = DbSetCommand(self.api, 'Interface', self.name,
('type', 'internal'))
cmd.run_idl(txn)
class DelBridgeCommand(BaseCommand):
def __init__(self, api, name, if_exists):
super(DelBridgeCommand, self).__init__(api)
self.name = name
self.if_exists = if_exists
def run_idl(self, txn):
try:
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name',
self.name)
except idlutils.RowNotFound:
if self.if_exists:
return
else:
msg = _LE("Bridge %s does not exist") % self.name
LOG.error(msg)
raise RuntimeError(msg)
self.api._ovs.verify('bridges')
for port in br.ports:
cmd = DelPortCommand(self.api, port.name, self.name,
if_exists=True)
cmd.run_idl(txn)
bridges = self.api._ovs.bridges
bridges.remove(br)
self.api._ovs.bridges = bridges
self.api._tables['Bridge'].rows[br.uuid].delete()
class BridgeExistsCommand(BaseCommand):
def __init__(self, api, name):
super(BridgeExistsCommand, self).__init__(api)
self.name = name
def run_idl(self, txn):
self.result = bool(idlutils.row_by_value(self.api.idl, 'Bridge',
'name', self.name, None))
class ListBridgesCommand(BaseCommand):
def __init__(self, api):
super(ListBridgesCommand, self).__init__(api)
def run_idl(self, txn):
# NOTE (twilson) [x.name for x in rows.values()] if no index
self.result = [x.name for x in
self.api._tables['Bridge'].rows.values()]
class BrGetExternalIdCommand(BaseCommand):
def __init__(self, api, name, field):
super(BrGetExternalIdCommand, self).__init__(api)
self.name = name
self.field = field
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.name)
self.result = br.external_ids[self.field]
class BrSetExternalIdCommand(BaseCommand):
def __init__(self, api, name, field, value):
super(BrSetExternalIdCommand, self).__init__(api)
self.name = name
self.field = field
self.value = value
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.name)
external_ids = getattr(br, 'external_ids', {})
external_ids[self.field] = self.value
br.external_ids = external_ids
class DbCreateCommand(BaseCommand):
def __init__(self, api, table, **columns):
super(DbCreateCommand, self).__init__(api)
self.table = table
self.columns = columns
def run_idl(self, txn):
row = txn.insert(self.api._tables[self.table])
for col, val in self.columns.items():
setattr(row, col, val)
self.result = row
class DbDestroyCommand(BaseCommand):
def __init__(self, api, table, record):
super(DbDestroyCommand, self).__init__(api)
self.table = table
self.record = record
def run_idl(self, txn):
record = idlutils.row_by_record(self.api.idl, self.table, self.record)
record.delete()
class DbSetCommand(BaseCommand):
def __init__(self, api, table, record, *col_values):
super(DbSetCommand, self).__init__(api)
self.table = table
self.record = record
self.col_values = col_values
def run_idl(self, txn):
record = idlutils.row_by_record(self.api.idl, self.table, self.record)
for col, val in self.col_values:
# TODO(twilson) Ugh, the OVS library doesn't like OrderedDict
# We're only using it to make a unit test work, so we should fix
# this soon.
if isinstance(val, collections.OrderedDict):
val = dict(val)
setattr(record, col, val)
class DbClearCommand(BaseCommand):
def __init__(self, api, table, record, column):
super(DbClearCommand, self).__init__(api)
self.table = table
self.record = record
self.column = column
def run_idl(self, txn):
record = idlutils.row_by_record(self.api.idl, self.table, self.record)
# Create an empty value of the column type
value = type(getattr(record, self.column))()
setattr(record, self.column, value)
class DbGetCommand(BaseCommand):
def __init__(self, api, table, record, column):
super(DbGetCommand, self).__init__(api)
self.table = table
self.record = record
self.column = column
def run_idl(self, txn):
record = idlutils.row_by_record(self.api.idl, self.table, self.record)
# TODO(twilson) This feels wrong, but ovs-vsctl returns single results
# on set types without the list. The IDL is returning them as lists,
# even if the set has the maximum number of items set to 1. Might be
# able to inspect the Schema and just do this conversion for that case.
result = idlutils.get_column_value(record, self.column)
if isinstance(result, list) and len(result) == 1:
self.result = result[0]
else:
self.result = result
class SetControllerCommand(BaseCommand):
def __init__(self, api, bridge, targets):
super(SetControllerCommand, self).__init__(api)
self.bridge = bridge
self.targets = targets
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.bridge)
controllers = []
for target in self.targets:
controller = txn.insert(self.api._tables['Controller'])
controller.target = target
controllers.append(controller)
br.verify('controller')
br.controller = controllers
class DelControllerCommand(BaseCommand):
def __init__(self, api, bridge):
super(DelControllerCommand, self).__init__(api)
self.bridge = bridge
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.bridge)
br.controller = []
class GetControllerCommand(BaseCommand):
def __init__(self, api, bridge):
super(GetControllerCommand, self).__init__(api)
self.bridge = bridge
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.bridge)
br.verify('controller')
self.result = [c.target for c in br.controller]
class SetFailModeCommand(BaseCommand):
def __init__(self, api, bridge, mode):
super(SetFailModeCommand, self).__init__(api)
self.bridge = bridge
self.mode = mode
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.bridge)
br.verify('fail_mode')
br.fail_mode = self.mode
class AddPortCommand(BaseCommand):
def __init__(self, api, bridge, port, may_exist):
super(AddPortCommand, self).__init__(api)
self.bridge = bridge
self.port = port
self.may_exist = may_exist
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.bridge)
if self.may_exist:
port = idlutils.row_by_value(self.api.idl, 'Port', 'name',
self.port, None)
if port:
return
port = txn.insert(self.api._tables['Port'])
port.name = self.port
br.verify('ports')
ports = getattr(br, 'ports', [])
ports.append(port)
br.ports = ports
iface = txn.insert(self.api._tables['Interface'])
iface.name = self.port
port.verify('interfaces')
ifaces = getattr(port, 'interfaces', [])
ifaces.append(iface)
port.interfaces = ifaces
class DelPortCommand(BaseCommand):
def __init__(self, api, port, bridge, if_exists):
super(DelPortCommand, self).__init__(api)
self.port = port
self.bridge = bridge
self.if_exists = if_exists
def run_idl(self, txn):
try:
port = idlutils.row_by_value(self.api.idl, 'Port', 'name',
self.port)
except idlutils.RowNotFound:
if self.if_exists:
return
msg = _LE("Port %s does not exist") % self.port
raise RuntimeError(msg)
if self.bridge:
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name',
self.bridge)
else:
br = next(b for b in self.api._tables['Bridge'].rows.values()
if port in b.ports)
if port.uuid not in br.ports and not self.if_exists:
# TODO(twilson) Make real errors across both implementations
msg = _LE("Port %(port)s does not exist on %(bridge)s!") % {
'port': self.name, 'bridge': self.bridge
}
LOG.error(msg)
raise RuntimeError(msg)
br.verify('ports')
ports = br.ports
ports.remove(port)
br.ports = ports
# Also remove port/interface directly for indexing?
port.verify('interfaces')
for iface in port.interfaces:
self.api._tables['Interface'].rows[iface.uuid].delete()
self.api._tables['Port'].rows[port.uuid].delete()
class ListPortsCommand(BaseCommand):
def __init__(self, api, bridge):
super(ListPortsCommand, self).__init__(api)
self.bridge = bridge
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.bridge)
self.result = [p.name for p in br.ports if p.name != self.bridge]
class ListIfacesCommand(BaseCommand):
def __init__(self, api, bridge):
super(ListIfacesCommand, self).__init__(api)
self.bridge = bridge
def run_idl(self, txn):
br = idlutils.row_by_value(self.api.idl, 'Bridge', 'name', self.bridge)
self.result = [i.name for p in br.ports if p.name != self.bridge
for i in p.interfaces]
class PortToBridgeCommand(BaseCommand):
def __init__(self, api, name):
super(PortToBridgeCommand, self).__init__(api)
self.name = name
def run_idl(self, txn):
# TODO(twilson) This is expensive!
# This traversal of all ports could be eliminated by caching the bridge
# name on the Port's external_id field
# In fact, if we did that, the only place that uses to_br functions
# could just add the external_id field to the conditions passed to find
port = idlutils.row_by_value(self.api.idl, 'Port', 'name', self.name)
bridges = self.api._tables['Bridge'].rows.values()
self.result = next(br.name for br in bridges if port in br.ports)
class InterfaceToBridgeCommand(BaseCommand):
def __init__(self, api, name):
super(InterfaceToBridgeCommand, self).__init__(api)
self.name = name
def run_idl(self, txn):
interface = idlutils.row_by_value(self.api.idl, 'Interface', 'name',
self.name)
ports = self.api._tables['Port'].rows.values()
pname = next(
port for port in ports if interface in port.interfaces)
bridges = self.api._tables['Bridge'].rows.values()
self.result = next(br.name for br in bridges if pname in br.ports)
class DbListCommand(BaseCommand):
def __init__(self, api, table, records, columns, if_exists):
super(DbListCommand, self).__init__(api)
self.table = table
self.columns = columns
self.if_exists = if_exists
self.records = records
def run_idl(self, txn):
table_schema = self.api._tables[self.table]
columns = self.columns or table_schema.columns.keys() + ['_uuid']
if self.records:
row_uuids = []
for record in self.records:
try:
row_uuids.append(idlutils.row_by_record(
self.api.idl, self.table, record).uuid)
except idlutils.RowNotFound:
if self.if_exists:
continue
# NOTE(kevinbenton): this is converted to a RuntimeError
# for compat with the vsctl version. It might make more
# sense to change this to a RowNotFoundError in the future.
raise RuntimeError(_LE(
"Row doesn't exist in the DB. Request info: "
"Table=%(table)s. Columns=%(columns)s. "
"Records=%(records)s.") % {
"table": self.table,
"columns": self.columns,
"records": self.records,
})
else:
row_uuids = table_schema.rows.keys()
self.result = [
{
c: idlutils.get_column_value(table_schema.rows[uuid], c)
for c in columns
}
for uuid in row_uuids
]
class DbFindCommand(BaseCommand):
def __init__(self, api, table, *conditions, **kwargs):
super(DbFindCommand, self).__init__(api)
self.table = self.api._tables[table]
self.conditions = conditions
self.columns = (kwargs.get('columns') or
self.table.columns.keys() + ['_uuid'])
def run_idl(self, txn):
self.result = [
{
c: idlutils.get_column_value(r, c)
for c in self.columns
}
for r in self.table.rows.values()
if idlutils.row_match(r, self.conditions)
]