63 lines
2.8 KiB
Python
63 lines
2.8 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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from neutron_lib.db import constants as db_const
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from neutron_lib.db import model_base
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import sqlalchemy as sa
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from sqlalchemy import sql
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from neutron.agent.common import utils
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class Agent(model_base.BASEV2, model_base.HasId):
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"""Represents agents running in neutron deployments."""
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__table_args__ = (
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sa.UniqueConstraint('agent_type', 'host',
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name='uniq_agents0agent_type0host'),
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model_base.BASEV2.__table_args__
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)
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# L3 agent, DHCP agent, OVS agent, LinuxBridge
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agent_type = sa.Column(sa.String(255), nullable=False)
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binary = sa.Column(sa.String(255), nullable=False)
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# TOPIC is a fanout exchange topic
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topic = sa.Column(sa.String(255), nullable=False)
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# TOPIC.host is a target topic
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host = sa.Column(sa.String(255), nullable=False, index=True)
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availability_zone = sa.Column(sa.String(255))
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admin_state_up = sa.Column(sa.Boolean, default=True,
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server_default=sql.true(), nullable=False)
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# the time when first report came from agents
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created_at = sa.Column(sa.DateTime, nullable=False)
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# the time when first report came after agents start
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started_at = sa.Column(sa.DateTime, nullable=False)
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# updated when agents report
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heartbeat_timestamp = sa.Column(sa.DateTime, nullable=False)
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# description is note for admin user
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description = sa.Column(sa.String(db_const.DESCRIPTION_FIELD_SIZE))
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# configurations: a json dict string, I think 4095 is enough
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configurations = sa.Column(sa.String(4095), nullable=False)
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# resource_versions: json dict, 8191 allows for ~256 resource versions
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# assuming ~32byte length "'name': 'ver',"
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# the whole row limit is 65535 bytes in mysql
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resource_versions = sa.Column(sa.String(8191))
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# load - number of resources hosted by the agent
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load = sa.Column(sa.Integer, server_default='0', nullable=False)
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# resources_synced: nullable boolean, success of last sync to Placement
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resources_synced = sa.Column(
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sa.Boolean, default=None, server_default=None, nullable=True)
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@property
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def is_active(self):
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return not utils.is_agent_down(self.heartbeat_timestamp)
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