def create_pool(self, context, pool):
provider_name = self._get_provider_name(context, pool['pool'])
p = super(LoadBalancerPlugin, self).create_pool(context, pool)
self.service_type_manager.add_resource_association(
context, constants.LOADBALANCER, provider_name, p['id'])
#need to add provider name to pool dict,
#because provider was not known to db plugin at pool creation
p['provider'] = provider_name
driver = self.drivers[provider_name]
try:
driver.create_pool(context, p)
except loadbalancer.NoEligibleBackend:
# that should catch cases when backend of any kind
# is not available (agent, appliance, etc)
self.update_status(context, ldb.Pool, p['id'], constants.ERROR,
"No eligible backend")
raise loadbalancer.NoEligibleBackend(pool_id=p['id'])
return p
def create_pool(self, context, pool):
provider_name = self._get_provider_name(context, pool['pool'])
p = super(LoadBalancerPlugin, self).create_pool(
context,
pool) ## DB中创建pool对象，该行代码执行完后数据库即有记录,其中status=PENDING_CREATE
self.service_type_manager.add_resource_association(
context, constants.LOADBALANCER, provider_name, p['id'])
#need to add provider name to pool dict,
#because provider was not known to db plugin at pool creation
p['provider'] = provider_name #provider_name为string类型的'haproxy'
driver = self.drivers[
provider_name] #service_provider=LOADBALANCER:Haproxy:neutron.services.loadbalancer.drivers.haproxy.plugin_driver.HaproxyOnHostPluginDriver:default
try:
driver.create_pool(
context, p
) #neutron/services/loadbalancer/drivers/common/agent_driver_base.py line372 create_pool
except loadbalancer.NoEligibleBackend:
# that should catch cases when backend of any kind
# is not available (agent, appliance, etc)
self.update_status(context, ldb.Pool, p['id'], constants.ERROR,
"No eligible backend") #更新数据库
raise loadbalancer.NoEligibleBackend(pool_id=p['id'])
return p