Load Balancing as a Service (LBaaS) for OpenStack
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octavia/octavia/amphorae/backends/agent/api_server/loadbalancer.py

479 lines
19 KiB

# Copyright 2015 Hewlett-Packard Development Company, L.P.
#
# 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 hashlib
import io
import os
import re
import shutil
import stat
import subprocess
import flask
import jinja2
from oslo_config import cfg
from oslo_log import log as logging
import webob
from werkzeug import exceptions
from octavia.amphorae.backends.agent.api_server import haproxy_compatibility
from octavia.amphorae.backends.agent.api_server import osutils
from octavia.amphorae.backends.agent.api_server import util
from octavia.common import constants as consts
from octavia.common import utils as octavia_utils
LOG = logging.getLogger(__name__)
BUFFER = 100
CONF = cfg.CONF
UPSTART_CONF = 'upstart.conf.j2'
SYSVINIT_CONF = 'sysvinit.conf.j2'
SYSTEMD_CONF = 'systemd.conf.j2'
JINJA_ENV = jinja2.Environment(
autoescape=True,
loader=jinja2.FileSystemLoader(os.path.dirname(
os.path.realpath(__file__)
) + consts.AGENT_API_TEMPLATES))
UPSTART_TEMPLATE = JINJA_ENV.get_template(UPSTART_CONF)
SYSVINIT_TEMPLATE = JINJA_ENV.get_template(SYSVINIT_CONF)
SYSTEMD_TEMPLATE = JINJA_ENV.get_template(SYSTEMD_CONF)
# Wrap a stream so we can compute the md5 while reading
class Wrapped(object):
def __init__(self, stream_):
self.stream = stream_
self.hash = hashlib.md5() # nosec
def read(self, l):
block = self.stream.read(l)
if block:
self.hash.update(block)
return block
def get_md5(self):
return self.hash.hexdigest()
def __getattr__(self, attr):
return getattr(self.stream, attr)
class Loadbalancer(object):
def __init__(self):
self._osutils = osutils.BaseOS.get_os_util()
def get_haproxy_config(self, lb_id):
"""Gets the haproxy config
:param listener_id: the id of the listener
"""
self._check_lb_exists(lb_id)
with open(util.config_path(lb_id), 'r') as file:
cfg = file.read()
resp = webob.Response(cfg, content_type='text/plain')
resp.headers['ETag'] = (
hashlib.md5(octavia_utils.b(cfg)).hexdigest()) # nosec
return resp
def upload_haproxy_config(self, amphora_id, lb_id):
"""Upload the haproxy config
:param amphora_id: The id of the amphora to update
:param lb_id: The id of the loadbalancer
"""
stream = Wrapped(flask.request.stream)
# We have to hash here because HAProxy has a string length limitation
# in the configuration file "peer <peername>" lines
peer_name = octavia_utils.base64_sha1_string(amphora_id).rstrip('=')
if not os.path.exists(util.haproxy_dir(lb_id)):
os.makedirs(util.haproxy_dir(lb_id))
name = os.path.join(util.haproxy_dir(lb_id), 'haproxy.cfg.new')
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
# mode 00600
mode = stat.S_IRUSR | stat.S_IWUSR
b = stream.read(BUFFER)
s_io = io.StringIO()
while b:
# Write haproxy configuration to StringIO
s_io.write(b.decode('utf8'))
b = stream.read(BUFFER)
# Since haproxy user_group is now auto-detected by the amphora agent,
# remove it from haproxy configuration in case it was provided
# by an older Octavia controller. This is needed in order to prevent
# a duplicate entry for 'group' in haproxy configuration, which will
# result an error when haproxy starts.
new_config = re.sub(r"\s+group\s.+", "", s_io.getvalue())
# Handle any haproxy version compatibility issues
new_config = haproxy_compatibility.process_cfg_for_version_compat(
new_config)
with os.fdopen(os.open(name, flags, mode), 'w') as file:
file.write(new_config)
# use haproxy to check the config
cmd = "haproxy -c -L {peer} -f {config_file} -f {haproxy_ug}".format(
config_file=name, peer=peer_name,
haproxy_ug=consts.HAPROXY_USER_GROUP_CFG)
try:
subprocess.check_output(cmd.split(), stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
LOG.error("Failed to verify haproxy file: %s %s", e, e.output)
# Save the last config that failed validation for debugging
os.rename(name, ''.join([name, '-failed']))
return webob.Response(
json=dict(message="Invalid request", details=e.output),
status=400)
# file ok - move it
os.rename(name, util.config_path(lb_id))
try:
init_system = util.get_os_init_system()
LOG.debug('Found init system: %s', init_system)
init_path = util.init_path(lb_id, init_system)
if init_system == consts.INIT_SYSTEMD:
template = SYSTEMD_TEMPLATE
# Render and install the network namespace systemd service
util.install_netns_systemd_service()
util.run_systemctl_command(
consts.ENABLE, consts.AMP_NETNS_SVC_PREFIX + '.service')
elif init_system == consts.INIT_UPSTART:
template = UPSTART_TEMPLATE
elif init_system == consts.INIT_SYSVINIT:
template = SYSVINIT_TEMPLATE
init_enable_cmd = "insserv {file}".format(file=init_path)
else:
raise util.UnknownInitError()
except util.UnknownInitError:
LOG.error("Unknown init system found.")
return webob.Response(json=dict(
message="Unknown init system in amphora",
details="The amphora image is running an unknown init "
"system. We can't create the init configuration "
"file for the load balancing process."), status=500)
if init_system == consts.INIT_SYSTEMD:
# mode 00644
mode = (stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH)
else:
# mode 00755
mode = (stat.S_IRWXU | stat.S_IRGRP | stat.S_IXGRP |
stat.S_IROTH | stat.S_IXOTH)
hap_major, hap_minor = haproxy_compatibility.get_haproxy_versions()
if not os.path.exists(init_path):
with os.fdopen(os.open(init_path, flags, mode), 'w') as text_file:
text = template.render(
peer_name=peer_name,
haproxy_pid=util.pid_path(lb_id),
haproxy_cmd=util.CONF.haproxy_amphora.haproxy_cmd,
haproxy_cfg=util.config_path(lb_id),
haproxy_user_group_cfg=consts.HAPROXY_USER_GROUP_CFG,
respawn_count=util.CONF.haproxy_amphora.respawn_count,
respawn_interval=(util.CONF.haproxy_amphora.
respawn_interval),
amphora_netns=consts.AMP_NETNS_SVC_PREFIX,
amphora_nsname=consts.AMPHORA_NAMESPACE,
HasIFUPAll=self._osutils.has_ifup_all(),
haproxy_major_version=hap_major,
haproxy_minor_version=hap_minor
)
text_file.write(text)
# Make sure the new service is enabled on boot
if init_system == consts.INIT_SYSTEMD:
util.run_systemctl_command(
consts.ENABLE, "haproxy-{lb_id}".format(lb_id=lb_id))
elif init_system == consts.INIT_SYSVINIT:
try:
subprocess.check_output(init_enable_cmd.split(),
stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
LOG.error("Failed to enable haproxy-%(lb_id)s service: "
"%(err)s %(out)s", {'lb_id': lb_id, 'err': e,
'out': e.output})
return webob.Response(json=dict(
message="Error enabling haproxy-{0} service".format(
lb_id), details=e.output), status=500)
res = webob.Response(json={'message': 'OK'}, status=202)
res.headers['ETag'] = stream.get_md5()
return res
def start_stop_lb(self, lb_id, action):
action = action.lower()
if action not in [consts.AMP_ACTION_START,
consts.AMP_ACTION_STOP,
consts.AMP_ACTION_RELOAD]:
return webob.Response(json=dict(
message='Invalid Request',
details="Unknown action: {0}".format(action)), status=400)
self._check_lb_exists(lb_id)
# Since this script should be created at LB create time
# we can check for this path to see if VRRP is enabled
# on this amphora and not write the file if VRRP is not in use
if os.path.exists(util.keepalived_check_script_path()):
self.vrrp_check_script_update(lb_id, action)
# HAProxy does not start the process when given a reload
# so start it if haproxy is not already running
if action == consts.AMP_ACTION_RELOAD:
if consts.OFFLINE == self._check_haproxy_status(lb_id):
action = consts.AMP_ACTION_START
cmd = ("/usr/sbin/service haproxy-{lb_id} {action}".format(
lb_id=lb_id, action=action))
try:
subprocess.check_output(cmd.split(), stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
if b'Job is already running' not in e.output:
LOG.debug(
"Failed to %(action)s haproxy-%(lb_id)s service: %(err)s "
"%(out)s", {'action': action, 'lb_id': lb_id,
'err': e, 'out': e.output})
return webob.Response(json=dict(
message="Error {0}ing haproxy".format(action),
details=e.output), status=500)
if action in [consts.AMP_ACTION_STOP,
consts.AMP_ACTION_RELOAD]:
return webob.Response(json=dict(
message='OK',
details='Listener {lb_id} {action}ed'.format(
lb_id=lb_id, action=action)), status=202)
details = (
'Configuration file is valid\n'
'haproxy daemon for {0} started'.format(lb_id)
)
return webob.Response(json=dict(message='OK', details=details),
status=202)
def delete_lb(self, lb_id):
try:
self._check_lb_exists(lb_id)
except exceptions.HTTPException:
return webob.Response(json={'message': 'OK'})
# check if that haproxy is still running and if stop it
if os.path.exists(util.pid_path(lb_id)) and os.path.exists(
os.path.join('/proc', util.get_haproxy_pid(lb_id))):
cmd = "/usr/sbin/service haproxy-{0} stop".format(lb_id)
try:
subprocess.check_output(cmd.split(), stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
LOG.error("Failed to stop haproxy-%s service: %s %s",
lb_id, e, e.output)
return webob.Response(json=dict(
message="Error stopping haproxy",
details=e.output), status=500)
# parse config and delete stats socket
try:
stats_socket = util.parse_haproxy_file(lb_id)[0]
os.remove(stats_socket)
except Exception:
pass
# Since this script should be deleted at LB delete time
# we can check for this path to see if VRRP is enabled
# on this amphora and not write the file if VRRP is not in use
if os.path.exists(util.keepalived_check_script_path()):
self.vrrp_check_script_update(
lb_id, action=consts.AMP_ACTION_STOP)
# delete the ssl files
try:
shutil.rmtree(self._cert_dir(lb_id))
except Exception:
pass
# disable the service
init_system = util.get_os_init_system()
init_path = util.init_path(lb_id, init_system)
if init_system == consts.INIT_SYSTEMD:
util.run_systemctl_command(
consts.DISABLE, "haproxy-{lb_id}".format(
lb_id=lb_id))
elif init_system == consts.INIT_SYSVINIT:
init_disable_cmd = "insserv -r {file}".format(file=init_path)
elif init_system != consts.INIT_UPSTART:
raise util.UnknownInitError()
if init_system == consts.INIT_SYSVINIT:
try:
subprocess.check_output(init_disable_cmd.split(),
stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
LOG.error("Failed to disable haproxy-%(lb_id)s service: "
"%(err)s %(out)s", {'lb_id': lb_id, 'err': e,
'out': e.output})
return webob.Response(json=dict(
message="Error disabling haproxy-{0} service".format(
lb_id), details=e.output), status=500)
# delete the directory + init script for that listener
shutil.rmtree(util.haproxy_dir(lb_id))
if os.path.exists(init_path):
os.remove(init_path)
return webob.Response(json={'message': 'OK'})
def get_all_listeners_status(self, other_listeners=None):
"""Gets the status of all listeners
This method will not consult the stats socket
so a listener might show as ACTIVE but still be
in ERROR
Currently type==SSL is also not detected
"""
listeners = list()
for lb in util.get_loadbalancers():
stats_socket, listeners_on_lb = util.parse_haproxy_file(lb)
for listener_id, listener in listeners_on_lb.items():
listeners.append({
'status': consts.ACTIVE,
'uuid': listener_id,
'type': listener['mode'],
})
if other_listeners:
listeners = listeners + other_listeners
return webob.Response(json=listeners, content_type='application/json')
def upload_certificate(self, lb_id, filename):
self._check_ssl_filename_format(filename)
# create directory if not already there
if not os.path.exists(self._cert_dir(lb_id)):
os.makedirs(self._cert_dir(lb_id))
stream = Wrapped(flask.request.stream)
file = self._cert_file_path(lb_id, filename)
flags = os.O_WRONLY | os.O_CREAT
# mode 00600
mode = stat.S_IRUSR | stat.S_IWUSR
with os.fdopen(os.open(file, flags, mode), 'wb') as crt_file:
b = stream.read(BUFFER)
while b:
crt_file.write(b)
b = stream.read(BUFFER)
resp = webob.Response(json=dict(message='OK'))
resp.headers['ETag'] = stream.get_md5()
return resp
def get_certificate_md5(self, lb_id, filename):
self._check_ssl_filename_format(filename)
cert_path = self._cert_file_path(lb_id, filename)
path_exists = os.path.exists(cert_path)
if not path_exists:
return webob.Response(json=dict(
message='Certificate Not Found',
details="No certificate with filename: {f}".format(
f=filename)), status=404)
with open(cert_path, 'r') as crt_file:
cert = crt_file.read()
md5 = hashlib.md5(octavia_utils.b(cert)).hexdigest() # nosec
resp = webob.Response(json=dict(md5sum=md5))
resp.headers['ETag'] = md5
return resp
def delete_certificate(self, lb_id, filename):
self._check_ssl_filename_format(filename)
if os.path.exists(self._cert_file_path(lb_id, filename)):
os.remove(self._cert_file_path(lb_id, filename))
return webob.Response(json=dict(message='OK'))
def _get_listeners_on_lb(self, lb_id):
if os.path.exists(util.pid_path(lb_id)):
if os.path.exists(
os.path.join('/proc', util.get_haproxy_pid(lb_id))):
# Check if the listener is disabled
with open(util.config_path(lb_id), 'r') as file:
cfg = file.read()
m = re.findall('^frontend (.*)$', cfg, re.MULTILINE)
return m or []
else: # pid file but no process...
return []
else:
return []
def _check_lb_exists(self, lb_id):
# check if we know about that lb
if lb_id not in util.get_loadbalancers():
raise exceptions.HTTPException(
response=webob.Response(json=dict(
message='Loadbalancer Not Found',
details="No loadbalancer with UUID: {0}".format(
lb_id)), status=404))
def _check_ssl_filename_format(self, filename):
# check if the format is (xxx.)*xxx.pem
if not re.search(r'(\w.)+pem', filename):
raise exceptions.HTTPException(
response=webob.Response(json=dict(
message='Filename has wrong format'), status=400))
def _cert_dir(self, lb_id):
return os.path.join(util.CONF.haproxy_amphora.base_cert_dir, lb_id)
def _cert_file_path(self, lb_id, filename):
return os.path.join(self._cert_dir(lb_id), filename)
def vrrp_check_script_update(self, lb_id, action):
lb_ids = util.get_loadbalancers()
if action == consts.AMP_ACTION_STOP:
lb_ids.remove(lb_id)
args = []
for lbid in lb_ids:
args.append(util.haproxy_sock_path(lbid))
if not os.path.exists(util.keepalived_dir()):
os.makedirs(util.keepalived_dir())
os.makedirs(util.keepalived_check_scripts_dir())
cmd = 'haproxy-vrrp-check {args}; exit $?'.format(args=' '.join(args))
with open(util.haproxy_check_script_path(), 'w') as text_file:
text_file.write(cmd)
def _check_haproxy_status(self, lb_id):
if os.path.exists(util.pid_path(lb_id)):
if os.path.exists(
os.path.join('/proc', util.get_haproxy_pid(lb_id))):
return consts.ACTIVE
return consts.OFFLINE