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netscaler.py
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netscaler.py
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#!/usr/bin/env python
from functools import wraps
import logging
from nssrc.com.citrix.netscaler.nitro.exception.nitro_exception \
import nitro_exception
from nssrc.com.citrix.netscaler.nitro.resource.config.lb.lbvserver \
import lbvserver
from nssrc.com.citrix.netscaler.nitro.service.nitro_service\
import nitro_service
from nssrc.com.citrix.netscaler.nitro.resource.config.basic.servicegroup\
import servicegroup
from nssrc.com.citrix.netscaler.nitro.resource.config.lb.lbvserver_servicegroup_binding\
import lbvserver_servicegroup_binding
from nssrc.com.citrix.netscaler.nitro.resource.config.basic.servicegroup_servicegroupmember_binding\
import servicegroup_servicegroupmember_binding
logger = logging.getLogger('docker_netscaler')
def ns_session_scope(func):
@wraps(func)
def login_logout(self, *args, **kwargs):
self.ns_session = nitro_service(self.nsip, 'HTTP')
self.ns_session.set_credential(self.nslogin, self.nspasswd)
self.ns_session.timeout = 600
self.ns_session.login()
result = func(self, *args, **kwargs)
self.ns_session.logout()
self.ns_session = None
return result
return login_logout
class NetscalerInterface:
def __init__(self, nsip, nslogin, nspasswd, app_info,
configure_frontends=False):
self.nsip = nsip
self.nslogin = nslogin
self.nspasswd = nspasswd
self.ns_session = None
self.app_info = app_info
"""
app_info expected structure:
'{"appkey": "com.citrix.lb.appname",
"apps": [{"name": "foo0", "lb_ip":"10.220.73.122", "lb_port":"443"},
{"name": "foo1", "lb_ip":"10.220.73.123", "lb_port":"80"},
{"name":"foo2"}, {"name":"foo3"}]}'
"""
if configure_frontends:
frontends = [(l['name'], l['lb_ip'], l['lb_port'])
for l in self.app_info['apps']
if l.get('lb_ip') and l.get('lb_port')]
for f in frontends:
self.configure_lb_frontend(f[0], f[1], f[2])
def _create_service_group(self, grpname):
try:
svc_grp = servicegroup.get(self.ns_session, grpname)
if (svc_grp.servicegroupname == grpname):
logger.info("Service group %s already configured " % grpname)
return
except nitro_exception as e:
pass
svc_grp = servicegroup()
svc_grp.servicegroupname = grpname
svc_grp.servicetype = "HTTP"
servicegroup.add(self.ns_session, svc_grp)
def _create_lb(self, lbname, lbmethod, vip, port):
try:
lb = lbvserver.get(self.ns_session, lbname)
if (lb.name == lbname) and \
(lb.ipv46 == vip) and \
(str(lb.port) == port):
logger.info("LB %s is already configured " % lbname)
return
else:
logger.info("LB %s is already configured with a different \
VIP/port : %s:%s\n" % (lb.name, lb.ipv46, lb.port))
raise Exception("LB %s already configured with different VIP/\
port : %s:%s\n" % (lbname, lb.ipv46, lb.port))
except nitro_exception as e:
pass
lb = lbvserver()
lb.name = lbname
lb.ipv46 = vip
lb.servicetype = "HTTP"
lb.port = port
lb.lbmethod = lbmethod
lbvserver.add(self.ns_session, lb)
def _add_service(self, grpname, srvr_ip, srvr_port):
try:
bindings = servicegroup_servicegroupmember_binding.get(
self.ns_session, grpname)
for binding in bindings:
if binding.ip == srvr_ip and str(binding.port) == srvr_port:
logger.info("Service %s:%s is already bound to service \
group %s " % (srvr_ip, srvr_port, grpname))
return
except nitro_exception as e:
pass
binding = servicegroup_servicegroupmember_binding()
binding.servicegroupname = grpname
binding.ip = srvr_ip
binding.port = srvr_port
servicegroup_servicegroupmember_binding.add(self.ns_session, binding)
def _bind_service_group_lb(self, lbname, grpname):
try:
bindings = lbvserver_servicegroup_binding.get(self.ns_session,
lbname)
for b in bindings:
if b.name == lbname and b.servicegroupname == grpname:
logger.info("LB %s is already bound to service group %s"
% (lbname, grpname))
return
except nitro_exception as e:
pass
binding = lbvserver_servicegroup_binding()
binding.name = lbname
binding.servicegroupname = grpname
lbvserver_servicegroup_binding.add(self.ns_session, binding)
def _configure_services(self, grpname, srvrs):
to_add = srvrs
to_remove = []
try:
bindings = servicegroup_servicegroupmember_binding.get(
self.ns_session, grpname)
existing = [(b.ip, b.port) for b in bindings if b.port != 0]
to_remove = list(set(existing) - set(srvrs))
to_add = list(set(srvrs) - set(existing))
to_leave = list(set(srvrs) & set(existing))
except nitro_exception as e:
pass # no bindings
for s in to_remove:
binding = servicegroup_servicegroupmember_binding()
binding.servicegroupname = grpname
binding.ip = s[0]
binding.port = s[1]
logger.info("Unbinding %s:%s from service group %s " % (s[0], s[1],
grpname))
servicegroup_servicegroupmember_binding.delete(self.ns_session,
binding)
for s in to_add:
binding = servicegroup_servicegroupmember_binding()
binding.servicegroupname = grpname
binding.ip = s[0]
binding.port = s[1]
logger.info("Binding %s:%s from service group %s " %
(s[0], s[1], grpname))
servicegroup_servicegroupmember_binding.add(self.ns_session,
binding)
for s in to_leave:
logger.info("%s:%s is already bound to service group %s"
% (s[0], s[1], grpname))
@ns_session_scope
def configure_lb_frontend(self, lbname, lb_vip, lb_port):
try:
self._create_lb(lbname, "ROUNDROBIN", lb_vip, lb_port)
except nitro_exception as ne:
logger.warn("Nitro Exception: %s" % ne.message)
except Exception as e:
logger.warn("Exception: %s" % e.message)
@ns_session_scope
def configure_lb(self, lbname, lb_vip, lb_ports, srvrs):
try:
self._create_lb(lbname, "ROUNDROBIN", lb_vip, lb_ports)
self._create_service_group(lbname) # Reuse lbname
self._bind_service_group_lb(lbname, lbname)
self._configure_services(lbname, srvrs)
except nitro_exception as ne:
logger.warn("Nitro Exception: %s" % ne.message)
except Exception as e:
logger.warn("Exception: %s" % e.message)
@ns_session_scope
def configure_app(self, lbname, srvrs):
try:
self._create_service_group(lbname) # Reuse lbname
self._bind_service_group_lb(lbname, lbname)
self._configure_services(lbname, srvrs)
except nitro_exception as ne:
logger.warn("Nitro Exception: %s" % ne.message)
except Exception as e:
logger.warn("Exception: %s" % e.message)