236 lines
7.2 KiB
Python
236 lines
7.2 KiB
Python
# Copyright 2013 New Dream Network, LLC (DreamHost)
|
|
#
|
|
# 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 itertools
|
|
from six import moves
|
|
|
|
from neutron.agent.linux import utils
|
|
from neutron.plugins.common import constants as qconstants
|
|
from neutron.services.loadbalancer import constants
|
|
|
|
|
|
PROTOCOL_MAP = {
|
|
constants.PROTOCOL_TCP: 'tcp',
|
|
constants.PROTOCOL_HTTP: 'http',
|
|
constants.PROTOCOL_HTTPS: 'tcp',
|
|
}
|
|
|
|
BALANCE_MAP = {
|
|
constants.LB_METHOD_ROUND_ROBIN: 'roundrobin',
|
|
constants.LB_METHOD_LEAST_CONNECTIONS: 'leastconn',
|
|
constants.LB_METHOD_SOURCE_IP: 'source'
|
|
}
|
|
|
|
STATS_MAP = {
|
|
constants.STATS_ACTIVE_CONNECTIONS: 'scur',
|
|
constants.STATS_MAX_CONNECTIONS: 'smax',
|
|
constants.STATS_CURRENT_SESSIONS: 'scur',
|
|
constants.STATS_MAX_SESSIONS: 'smax',
|
|
constants.STATS_TOTAL_CONNECTIONS: 'stot',
|
|
constants.STATS_TOTAL_SESSIONS: 'stot',
|
|
constants.STATS_IN_BYTES: 'bin',
|
|
constants.STATS_OUT_BYTES: 'bout',
|
|
constants.STATS_CONNECTION_ERRORS: 'econ',
|
|
constants.STATS_RESPONSE_ERRORS: 'eresp'
|
|
}
|
|
|
|
ACTIVE_PENDING_STATUSES = qconstants.ACTIVE_PENDING_STATUSES
|
|
INACTIVE = qconstants.INACTIVE
|
|
|
|
|
|
def save_config(conf_path, logical_config, socket_path=None,
|
|
user_group='nogroup'):
|
|
"""Convert a logical configuration to the HAProxy version."""
|
|
data = []
|
|
data.extend(_build_global(logical_config, socket_path=socket_path,
|
|
user_group=user_group))
|
|
data.extend(_build_defaults(logical_config))
|
|
data.extend(_build_frontend(logical_config))
|
|
data.extend(_build_backend(logical_config))
|
|
utils.replace_file(conf_path, '\n'.join(data))
|
|
|
|
|
|
def _build_global(config, socket_path=None, user_group='nogroup'):
|
|
opts = [
|
|
'daemon',
|
|
'user nobody',
|
|
'group %s' % user_group,
|
|
'log /dev/log local0',
|
|
'log /dev/log local1 notice'
|
|
]
|
|
|
|
if socket_path:
|
|
opts.append('stats socket %s mode 0666 level user' % socket_path)
|
|
|
|
return itertools.chain(['global'], ('\t' + o for o in opts))
|
|
|
|
|
|
def _build_defaults(config):
|
|
opts = [
|
|
'log global',
|
|
'retries 3',
|
|
'option redispatch',
|
|
'timeout connect 5000',
|
|
'timeout client 50000',
|
|
'timeout server 50000',
|
|
]
|
|
|
|
return itertools.chain(['defaults'], ('\t' + o for o in opts))
|
|
|
|
|
|
def _build_frontend(config):
|
|
protocol = config['vip']['protocol']
|
|
|
|
opts = [
|
|
'option tcplog',
|
|
'bind %s:%d' % (
|
|
_get_first_ip_from_port(config['vip']['port']),
|
|
config['vip']['protocol_port']
|
|
),
|
|
'mode %s' % PROTOCOL_MAP[protocol],
|
|
'default_backend %s' % config['pool']['id'],
|
|
]
|
|
|
|
if config['vip']['connection_limit'] >= 0:
|
|
opts.append('maxconn %s' % config['vip']['connection_limit'])
|
|
|
|
if protocol == constants.PROTOCOL_HTTP:
|
|
opts.append('option forwardfor')
|
|
|
|
return itertools.chain(
|
|
['frontend %s' % config['vip']['id']],
|
|
('\t' + o for o in opts)
|
|
)
|
|
|
|
|
|
def _build_backend(config):
|
|
protocol = config['pool']['protocol']
|
|
lb_method = config['pool']['lb_method']
|
|
|
|
opts = [
|
|
'mode %s' % PROTOCOL_MAP[protocol],
|
|
'balance %s' % BALANCE_MAP.get(lb_method, 'roundrobin')
|
|
]
|
|
|
|
if protocol == constants.PROTOCOL_HTTP:
|
|
opts.append('option forwardfor')
|
|
|
|
# add the first health_monitor (if available)
|
|
server_addon, health_opts = _get_server_health_option(config)
|
|
opts.extend(health_opts)
|
|
|
|
# add session persistence (if available)
|
|
persist_opts = _get_session_persistence(config)
|
|
opts.extend(persist_opts)
|
|
|
|
# add the members
|
|
for member in config['members']:
|
|
if ((member['status'] in ACTIVE_PENDING_STATUSES or
|
|
member['status'] == INACTIVE)
|
|
and member['admin_state_up']):
|
|
server = (('server %(id)s %(address)s:%(protocol_port)s '
|
|
'weight %(weight)s') % member) + server_addon
|
|
if _has_http_cookie_persistence(config):
|
|
server += ' cookie %d' % config['members'].index(member)
|
|
opts.append(server)
|
|
|
|
return itertools.chain(
|
|
['backend %s' % config['pool']['id']],
|
|
('\t' + o for o in opts)
|
|
)
|
|
|
|
|
|
def _get_first_ip_from_port(port):
|
|
for fixed_ip in port['fixed_ips']:
|
|
return fixed_ip['ip_address']
|
|
|
|
|
|
def _get_server_health_option(config):
|
|
"""return the first active health option."""
|
|
for m in config['healthmonitors']:
|
|
# not checking the status of healthmonitor for two reasons:
|
|
# 1) status field is absent in HealthMonitor model
|
|
# 2) only active HealthMonitors are fetched with
|
|
# LoadBalancerCallbacks.get_logical_device
|
|
if m['admin_state_up']:
|
|
monitor = m
|
|
break
|
|
else:
|
|
return '', []
|
|
|
|
server_addon = ' check inter %(delay)ds fall %(max_retries)d' % monitor
|
|
opts = [
|
|
'timeout check %ds' % monitor['timeout']
|
|
]
|
|
|
|
if monitor['type'] in (constants.HEALTH_MONITOR_HTTP,
|
|
constants.HEALTH_MONITOR_HTTPS):
|
|
opts.append('option httpchk %(http_method)s %(url_path)s' % monitor)
|
|
opts.append(
|
|
'http-check expect rstatus %s' %
|
|
'|'.join(_expand_expected_codes(monitor['expected_codes']))
|
|
)
|
|
|
|
if monitor['type'] == constants.HEALTH_MONITOR_HTTPS:
|
|
opts.append('option ssl-hello-chk')
|
|
|
|
return server_addon, opts
|
|
|
|
|
|
def _get_session_persistence(config):
|
|
persistence = config['vip'].get('session_persistence')
|
|
if not persistence:
|
|
return []
|
|
|
|
opts = []
|
|
if persistence['type'] == constants.SESSION_PERSISTENCE_SOURCE_IP:
|
|
opts.append('stick-table type ip size 10k')
|
|
opts.append('stick on src')
|
|
elif (persistence['type'] == constants.SESSION_PERSISTENCE_HTTP_COOKIE and
|
|
config.get('members')):
|
|
opts.append('cookie SRV insert indirect nocache')
|
|
elif (persistence['type'] == constants.SESSION_PERSISTENCE_APP_COOKIE and
|
|
persistence.get('cookie_name')):
|
|
opts.append('appsession %s len 56 timeout 3h' %
|
|
persistence['cookie_name'])
|
|
|
|
return opts
|
|
|
|
|
|
def _has_http_cookie_persistence(config):
|
|
return (config['vip'].get('session_persistence') and
|
|
config['vip']['session_persistence']['type'] ==
|
|
constants.SESSION_PERSISTENCE_HTTP_COOKIE)
|
|
|
|
|
|
def _expand_expected_codes(codes):
|
|
"""Expand the expected code string in set of codes.
|
|
|
|
200-204 -> 200, 201, 202, 204
|
|
200, 203 -> 200, 203
|
|
"""
|
|
|
|
retval = set()
|
|
for code in codes.replace(',', ' ').split(' '):
|
|
code = code.strip()
|
|
|
|
if not code:
|
|
continue
|
|
elif '-' in code:
|
|
low, hi = code.split('-')[:2]
|
|
retval.update(str(i) for i in moves.xrange(int(low), int(hi) + 1))
|
|
else:
|
|
retval.add(code)
|
|
return retval
|