# octavia.controller.worker.v2.taskflow_jobboard_driver

# Source code for octavia.controller.worker.v2.taskflow_jobboard_driver

    #    Licensed under the Apache License, Version 2.0 (the "License"); you may
    #    not use this file except in compliance with the License. You may obtain
    #    a copy of the License at
    #
    #         http://www.apache.org/licenses/LICENSE-2.0
    #
    #    Unless required by applicable law or agreed to in writing, software
    #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
    #    License for the specific language governing permissions and limitations
    #    under the License.

    import abc
    import contextlib

    from oslo_config import cfg
    from oslo_log import log
    from taskflow.jobs import backends as job_backends
    from taskflow.persistence import backends as persistence_backends

    LOG = log.getLogger(__name__)
    CONF = cfg.CONF

    class JobboardTaskFlowDriver(object, metaclass=abc.ABCMeta):

        @abc.abstractmethod
        def job_board(self, persistence):
            """Setting up jobboard backend based on configuration setting.

            :param persistence: taskflow persistence backend instance
            :return: taskflow jobboard backend instance
            """

    class MysqlPersistenceDriver(object):

        def __init__(self):
            self.persistence_conf = {
                'connection': CONF.task_flow.persistence_connection,
                'max_pool_size': CONF.database.max_pool_size,
                'max_overflow': CONF.database.max_overflow,
                'pool_timeout': CONF.database.pool_timeout,
            }

        def initialize(self):
            # Run migrations once on service start.
            backend = persistence_backends.fetch(self.persistence_conf)
            with contextlib.closing(backend):
                with contextlib.closing(backend.get_connection()) as connection:
                    connection.upgrade()

        @contextlib.contextmanager
        def get_persistence(self):
            # Rewrite taskflow get backend, so it won't run migrations on each call
            backend = persistence_backends.fetch(self.persistence_conf)
            with contextlib.closing(backend):
                with contextlib.closing(backend.get_connection()) as conn:
                    conn.validate()
                yield backend

    class ZookeeperTaskFlowDriver(JobboardTaskFlowDriver):

        def __init__(self, persistence_driver):
            self.persistence_driver = persistence_driver

        def job_board(self, persistence):
            job_backends_hosts = ','.join(
                ['%s:%s' % (host, CONF.task_flow.jobboard_backend_port)
                 for host in CONF.task_flow.jobboard_backend_hosts])
            jobboard_backend_conf = {
                'board': 'zookeeper',
                'hosts': job_backends_hosts,
                'path': '/' + CONF.task_flow.jobboard_backend_namespace,
            }
            jobboard_backend_conf.update(
                CONF.task_flow.jobboard_zookeeper_ssl_options)
            return job_backends.backend(CONF.task_flow.jobboard_name,
                                        jobboard_backend_conf,
                                        persistence=persistence)

    class RedisTaskFlowDriver(JobboardTaskFlowDriver):

        def __init__(self, persistence_driver):
            self.persistence_driver = persistence_driver

        def job_board(self, persistence):
            jobboard_backend_conf = {
                'board': 'redis',
                'host': CONF.task_flow.jobboard_backend_hosts[0],
                'port': CONF.task_flow.jobboard_backend_port,
                'password': CONF.task_flow.jobboard_backend_password,
                'namespace': CONF.task_flow.jobboard_backend_namespace,
            }
            jobboard_backend_conf.update(
                CONF.task_flow.jobboard_redis_backend_ssl_options)
            return job_backends.backend(
                CONF.task_flow.jobboard_backend_namespace,
                jobboard_backend_conf,
                persistence=persistence)

this page last updated: 2020-04-10 18:17:54

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