122 lines
4.4 KiB
Python
122 lines
4.4 KiB
Python
# Copyright (c) 2013 Mirantis, Inc.
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#
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# 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 murano.db import models
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from murano.db import session as db_session
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from murano.services import actions
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from murano.services import states
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class SessionServices(object):
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@staticmethod
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def get_sessions(environment_id, state=None):
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"""Get list of sessions for specified environment.
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:param environment_id: Environment Id
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:param state: murano.services.states.EnvironmentStatus
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:return: Sessions for specified Environment, if SessionState is
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not defined all sessions for specified environment is returned.
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"""
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unit = db_session.get_session()
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# Here we duplicate logic for reducing calls to database
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# Checks for validation is same as in validate.
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query = unit.query(models.Session).filter(
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# Get all session for this environment
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models.Session.environment_id == environment_id,
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# Only sessions with same version as current env version are valid
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)
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if state:
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# in this state, if state is not specified return in all states
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query = query.filter(models.Session.state == state)
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return query.order_by(models.Session.version.desc(),
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models.Session.updated.desc()).all()
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@staticmethod
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def create(environment_id, user_id):
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"""Creates session object for specific environment for specified user.
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:param environment_id: Environment Id
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:param user_id: User Id
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:return: Created session
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"""
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unit = db_session.get_session()
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environment = unit.query(models.Environment).get(environment_id)
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session = models.Session()
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session.environment_id = environment.id
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session.user_id = user_id
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session.state = states.SessionState.OPENED
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# used for checking if other sessions was deployed before this one
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session.version = environment.version
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# all changes to environment is stored here, and translated to
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# environment only after deployment completed
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session.description = environment.description
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with unit.begin():
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unit.add(session)
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return session
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@staticmethod
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def validate(session):
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"""Validates session
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Session is valid only if no other session for same.
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environment was already deployed on in deploying state,
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:param session: Session for validation
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"""
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# if other session is deploying now current session is invalid
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unit = db_session.get_session()
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# if environment version is higher than version on which current
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# session is created then other session was already deployed
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current_env = unit.query(models.Environment).\
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get(session.environment_id)
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if current_env.version > session.version:
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return False
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# if other session is deploying now current session is invalid
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other_is_deploying = unit.query(models.Session).filter_by(
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environment_id=session.environment_id,
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state=states.SessionState.DEPLOYING
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).count() > 0
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if session.state == states.SessionState.OPENED and other_is_deploying:
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return False
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return True
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@staticmethod
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def deploy(session, environment, unit, token):
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"""Prepares and deployes environment
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Prepares environment for deployment and send deployment command to
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orchestration engine
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:param session: session that is going to be deployed
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:param unit: SQLalchemy session
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:param token: auth token that is going to be used by orchestration
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"""
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deleted = session.description['Objects'] is None
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action_name = None if deleted else 'deploy'
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actions.ActionServices.submit_task(
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action_name, environment.id,
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{}, environment, session,
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token, unit)
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