def _get_network_hostable_dhcp_agents(self, plugin, context, network):
"""Provide information on hostable DHCP agents for network.
The returned value includes the number of agents that will actually
host the given network, a list of DHCP agents that can host the given
network, and a list of DHCP agents currently hosting the network.
"""
hosted_agents = self._get_dhcp_agents_hosting_network(plugin,
context, network)
if hosted_agents is None:
return {'n_agents': 0, 'hostable_agents': [], 'hosted_agents': []}
n_agents = cfg.CONF.dhcp_agents_per_network - len(hosted_agents)
az_hints = (network.get(az_def.AZ_HINTS) or
cfg.CONF.default_availability_zones)
active_dhcp_agents = self._get_active_agents(plugin, context, az_hints)
hosted_agent_ids = [agent['id'] for agent in hosted_agents]
if not active_dhcp_agents:
return {'n_agents': 0, 'hostable_agents': [],
'hosted_agents': hosted_agents}
hostable_dhcp_agents = [
agent for agent in active_dhcp_agents
if agent.id not in hosted_agent_ids and plugin.is_eligible_agent(
context, True, agent)]
hostable_dhcp_agents = self._filter_agents_with_network_access(
plugin, context, network, hostable_dhcp_agents)
if not hostable_dhcp_agents:
return {'n_agents': 0, 'hostable_agents': [],
'hosted_agents': hosted_agents}
n_agents = min(len(hostable_dhcp_agents), n_agents)
return {'n_agents': n_agents, 'hostable_agents': hostable_dhcp_agents,
'hosted_agents': hosted_agents}
def _get_network_hostable_dhcp_agents(self, plugin, context, network):
"""Provide information on hostable DHCP agents for network.
The returned value includes the number of agents that will actually
host the given network, a list of DHCP agents that can host the given
network, and a list of DHCP agents currently hosting the network.
"""
hosted_agents = self._get_dhcp_agents_hosting_network(plugin,
context, network)
if hosted_agents is None:
return {'n_agents': 0, 'hostable_agents': [], 'hosted_agents': []}
n_agents = cfg.CONF.dhcp_agents_per_network - len(hosted_agents)
az_hints = (network.get(az_def.AZ_HINTS) or
cfg.CONF.default_availability_zones)
active_dhcp_agents = self._get_active_agents(plugin, context, az_hints)
hosted_agent_ids = [agent['id'] for agent in hosted_agents]
if not active_dhcp_agents:
return {'n_agents': 0, 'hostable_agents': [],
'hosted_agents': hosted_agents}
hostable_dhcp_agents = [
agent for agent in active_dhcp_agents
if agent.id not in hosted_agent_ids and plugin.is_eligible_agent(
context, True, agent)]
hostable_dhcp_agents = self._filter_agents_with_network_access(
plugin, context, network, hostable_dhcp_agents)
if not hostable_dhcp_agents:
return {'n_agents': 0, 'hostable_agents': [],
'hosted_agents': hosted_agents}
n_agents = min(len(hostable_dhcp_agents), n_agents)
return {'n_agents': n_agents, 'hostable_agents': hostable_dhcp_agents,
'hosted_agents': hosted_agents}
def _get_dhcp_agents_hosting_network(self, plugin, context, network):
"""Return dhcp agents hosting the given network or None if a given
network is already hosted by enough number of agents.
"""
agents_per_network = cfg.CONF.dhcp_agents_per_network
# TODO(gongysh) don't schedule the networks with only
# subnets whose enable_dhcp is false
with db_api.CONTEXT_READER.using(context):
network_hosted_agents = plugin.get_dhcp_agents_hosting_networks(
context, [network['id']], hosts=network.get('candidate_hosts'))
if len(network_hosted_agents) >= agents_per_network:
LOG.debug('Network %s is already hosted by enough agents.',
network['id'])
return
return network_hosted_agents
def _get_dhcp_agents_hosting_network(self, plugin, context, network):
"""Return dhcp agents hosting the given network or None if a given
network is already hosted by enough number of agents.
"""
agents_per_network = cfg.CONF.dhcp_agents_per_network
# TODO(gongysh) don't schedule the networks with only
# subnets whose enable_dhcp is false
with context.session.begin(subtransactions=True):
network_hosted_agents = plugin.get_dhcp_agents_hosting_networks(
context, [network['id']], hosts=network.get('candidate_hosts'))
if len(network_hosted_agents) >= agents_per_network:
LOG.debug('Network %s is already hosted by enough agents.',
network['id'])
return
return network_hosted_agents
