916d97b5d6
Unifies haproxy reference implementation to make common agent based plugin driver which is suitable for all vendors who wants to use async mechanism. - Agent API as well as device driver API changed to handle loadbalancer objects individually; - Agent loads device drivers according to config; - LogicalDeviceCache class was removed from agent as it was used only as a list - to put and remove entries ant check whether entry is in or not. It was replaced with instance_mapping dict in agent to store known instances and corresponding device_drivers; - Agent reports which device drivers are supported (needs for scheduling on plugin side); - Agent-to-plugin API was extended to provide an ability for agent to update statuses of pools/vips/members/health_monitors; - Vendor should only implement device driver; plugin driver just needs to inherit AgentBasedPluginDriver and override device_driver member; - This patch doesn't move files to make review easier; all rename/replace will be done in a subsequent patch; DocImpact NOTE: Since the change in the agent RPC API is backward-incompatible (major RPC version change), LBaaS server-agent communications will be completely broken until both sides are upgraded so users will be unable to create new or update existing HAProxy loadbalancer instances during upgrade Implements blueprint lbaas-common-agent-driver Change-Id: I9fd90a1321611d202ef838681273081fa6c1686a
234 lines
7.1 KiB
Python
234 lines
7.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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#
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# Copyright 2013 New Dream Network, LLC (DreamHost)
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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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#
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# @author: Mark McClain, DreamHost
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import itertools
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from neutron.agent.linux import utils
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from neutron.plugins.common import constants as qconstants
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from neutron.services.loadbalancer import constants
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PROTOCOL_MAP = {
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constants.PROTOCOL_TCP: 'tcp',
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constants.PROTOCOL_HTTP: 'http',
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constants.PROTOCOL_HTTPS: 'tcp',
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}
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BALANCE_MAP = {
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constants.LB_METHOD_ROUND_ROBIN: 'roundrobin',
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constants.LB_METHOD_LEAST_CONNECTIONS: 'leastconn',
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constants.LB_METHOD_SOURCE_IP: 'source'
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}
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STATS_MAP = {
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constants.STATS_ACTIVE_CONNECTIONS: 'qcur',
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constants.STATS_MAX_CONNECTIONS: 'qmax',
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constants.STATS_CURRENT_SESSIONS: 'scur',
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constants.STATS_MAX_SESSIONS: 'smax',
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constants.STATS_TOTAL_SESSIONS: 'stot',
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constants.STATS_IN_BYTES: 'bin',
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constants.STATS_OUT_BYTES: 'bout',
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constants.STATS_CONNECTION_ERRORS: 'econ',
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constants.STATS_RESPONSE_ERRORS: 'eresp'
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}
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ACTIVE = qconstants.ACTIVE
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INACTIVE = qconstants.INACTIVE
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def save_config(conf_path, logical_config, socket_path=None,
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user_group='nogroup'):
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"""Convert a logical configuration to the HAProxy version."""
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data = []
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data.extend(_build_global(logical_config, socket_path=socket_path,
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user_group=user_group))
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data.extend(_build_defaults(logical_config))
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data.extend(_build_frontend(logical_config))
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data.extend(_build_backend(logical_config))
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utils.replace_file(conf_path, '\n'.join(data))
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def _build_global(config, socket_path=None, user_group='nogroup'):
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opts = [
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'daemon',
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'user nobody',
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'group %s' % user_group,
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'log /dev/log local0',
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'log /dev/log local1 notice'
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]
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if socket_path:
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opts.append('stats socket %s mode 0666 level user' % socket_path)
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return itertools.chain(['global'], ('\t' + o for o in opts))
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def _build_defaults(config):
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opts = [
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'log global',
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'retries 3',
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'option redispatch',
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'timeout connect 5000',
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'timeout client 50000',
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'timeout server 50000',
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]
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return itertools.chain(['defaults'], ('\t' + o for o in opts))
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def _build_frontend(config):
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protocol = config['vip']['protocol']
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opts = [
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'option tcplog',
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'bind %s:%d' % (
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_get_first_ip_from_port(config['vip']['port']),
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config['vip']['protocol_port']
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),
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'mode %s' % PROTOCOL_MAP[protocol],
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'default_backend %s' % config['pool']['id'],
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]
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if config['vip']['connection_limit'] >= 0:
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opts.append('maxconn %s' % config['vip']['connection_limit'])
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if protocol == constants.PROTOCOL_HTTP:
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opts.append('option forwardfor')
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return itertools.chain(
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['frontend %s' % config['vip']['id']],
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('\t' + o for o in opts)
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)
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def _build_backend(config):
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protocol = config['pool']['protocol']
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lb_method = config['pool']['lb_method']
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opts = [
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'mode %s' % PROTOCOL_MAP[protocol],
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'balance %s' % BALANCE_MAP.get(lb_method, 'roundrobin')
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]
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if protocol == constants.PROTOCOL_HTTP:
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opts.append('option forwardfor')
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# add the first health_monitor (if available)
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server_addon, health_opts = _get_server_health_option(config)
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opts.extend(health_opts)
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# add session persistence (if available)
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persist_opts = _get_session_persistence(config)
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opts.extend(persist_opts)
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# add the members
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for member in config['members']:
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if member['status'] in (ACTIVE, INACTIVE) and member['admin_state_up']:
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server = (('server %(id)s %(address)s:%(protocol_port)s '
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'weight %(weight)s') % member) + server_addon
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if _has_http_cookie_persistence(config):
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server += ' cookie %d' % config['members'].index(member)
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opts.append(server)
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return itertools.chain(
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['backend %s' % config['pool']['id']],
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('\t' + o for o in opts)
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)
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def _get_first_ip_from_port(port):
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for fixed_ip in port['fixed_ips']:
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return fixed_ip['ip_address']
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def _get_server_health_option(config):
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"""return the first active health option."""
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for monitor in config['healthmonitors']:
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# not checking the status of healthmonitor for two reasons:
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# 1) status field is absent in HealthMonitor model
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# 2) only active HealthMonitors are fetched with
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# LoadBalancerCallbacks.get_logical_device
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if monitor['admin_state_up']:
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break
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else:
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return '', []
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server_addon = ' check inter %(delay)ds fall %(max_retries)d' % monitor
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opts = [
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'timeout check %ds' % monitor['timeout']
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]
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if monitor['type'] in (constants.HEALTH_MONITOR_HTTP,
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constants.HEALTH_MONITOR_HTTPS):
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opts.append('option httpchk %(http_method)s %(url_path)s' % monitor)
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opts.append(
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'http-check expect rstatus %s' %
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'|'.join(_expand_expected_codes(monitor['expected_codes']))
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)
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if monitor['type'] == constants.HEALTH_MONITOR_HTTPS:
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opts.append('option ssl-hello-chk')
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return server_addon, opts
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def _get_session_persistence(config):
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persistence = config['vip'].get('session_persistence')
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if not persistence:
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return []
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opts = []
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if persistence['type'] == constants.SESSION_PERSISTENCE_SOURCE_IP:
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opts.append('stick-table type ip size 10k')
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opts.append('stick on src')
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elif persistence['type'] == constants.SESSION_PERSISTENCE_HTTP_COOKIE:
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opts.append('cookie SRV insert indirect nocache')
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elif (persistence['type'] == constants.SESSION_PERSISTENCE_APP_COOKIE and
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persistence.get('cookie_name')):
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opts.append('appsession %s len 56 timeout 3h' %
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persistence['cookie_name'])
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return opts
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def _has_http_cookie_persistence(config):
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return (config['vip'].get('session_persistence') and
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config['vip']['session_persistence']['type'] ==
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constants.SESSION_PERSISTENCE_HTTP_COOKIE)
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def _expand_expected_codes(codes):
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"""Expand the expected code string in set of codes.
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200-204 -> 200, 201, 202, 204
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200, 203 -> 200, 203
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"""
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retval = set()
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for code in codes.replace(',', ' ').split(' '):
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code = code.strip()
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if not code:
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continue
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elif '-' in code:
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low, hi = code.split('-')[:2]
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retval.update(str(i) for i in xrange(int(low), int(hi) + 1))
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else:
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retval.add(code)
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return retval
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