127 lines
4.3 KiB
Python
127 lines
4.3 KiB
Python
# Copyright 2018 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import falcon
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import json
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from drydock_provisioner.control.base import StatefulResource
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from drydock_provisioner.drivers.node.maasdriver.actions.node import ValidateNodeServices
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from drydock_provisioner.objects.healthcheck import HealthCheck
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from drydock_provisioner.objects.healthcheck import HealthCheckMessage
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from drydock_provisioner.objects.fields import ActionResult
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import drydock_provisioner.objects.fields as hd_fields
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import drydock_provisioner.policy as policy
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class HealthResource(StatefulResource):
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"""
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Returns empty response body that Drydock is healthy
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"""
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def __init__(self, orchestrator=None, **kwargs):
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"""Object initializer.
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:param orchestrator: instance of Drydock orchestrator
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"""
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super().__init__(**kwargs)
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self.orchestrator = orchestrator
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def on_get(self, req, resp):
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"""
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Returns 204 on healthy, otherwise 503, without response body.
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"""
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hc = HealthCheckCombined(
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state_manager=self.state_manager,
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orchestrator=self.orchestrator,
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extended=False)
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return hc.get(req, resp)
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class HealthExtendedResource(StatefulResource):
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"""
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Returns response body that Drydock is healthy
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"""
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def __init__(self, orchestrator=None, **kwargs):
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"""Object initializer.
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:param orchestrator: instance of Drydock orchestrator
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"""
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super().__init__(**kwargs)
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self.orchestrator = orchestrator
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@policy.ApiEnforcer('physical_provisioner:health_data')
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def on_get(self, req, resp):
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"""
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Returns 200 on success, otherwise 503, with a response body.
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"""
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hc = HealthCheckCombined(
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state_manager=self.state_manager,
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orchestrator=self.orchestrator,
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extended=True)
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return hc.get(req, resp)
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class HealthCheckCombined(object):
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"""
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Returns Drydock health check status.
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"""
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def __init__(self, state_manager=None, orchestrator=None, extended=False):
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"""Object initializer.
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:param orchestrator: instance of Drydock orchestrator
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"""
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self.state_manager = state_manager
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self.orchestrator = orchestrator
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self.extended = extended
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def get(self, req, resp):
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"""
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Returns updated response with body if extended.
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"""
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health_check = HealthCheck()
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# Test database connection
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try:
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now = self.state_manager.get_now()
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if now is None:
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raise Exception('None received from database for now()')
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except Exception:
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hcm = HealthCheckMessage(
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msg='Unable to connect to database', error=True)
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health_check.add_detail_msg(msg=hcm)
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# Test MaaS connection
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try:
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task = self.orchestrator.create_task(
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action=hd_fields.OrchestratorAction.Noop)
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maas_validation = ValidateNodeServices(task, self.orchestrator,
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self.state_manager)
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maas_validation.start()
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if maas_validation.task.get_status() == ActionResult.Failure:
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raise Exception('MaaS task failure')
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except Exception:
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hcm = HealthCheckMessage(
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msg='Unable to connect to MaaS', error=True)
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health_check.add_detail_msg(msg=hcm)
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if self.extended:
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resp.body = json.dumps(health_check.to_dict())
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if health_check.is_healthy() and self.extended:
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resp.status = falcon.HTTP_200
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elif health_check.is_healthy():
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resp.status = falcon.HTTP_204
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else:
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resp.status = falcon.HTTP_503
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