aa997bb6b8
Now event-log code have few bad points: 1) We push an list in context without any extra info 2) Name event_wrapper_without_instance looks strange 3) Code duplications This patch remove this bad points and make event-log code better. Partially implements blueprint event-log Change-Id: I075d256b4251159b71954e2f7e020cfd4d5e6b9b
256 lines
8.8 KiB
Python
256 lines
8.8 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");
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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
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# 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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from heatclient import exc as heat_exc
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from oslo_config import cfg
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from oslo_log import log as logging
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from sahara import conductor as c
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from sahara import context
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from sahara.i18n import _
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from sahara.i18n import _LI
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from sahara.i18n import _LW
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from sahara.service import engine as e
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from sahara.service import volumes
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from sahara.utils import cluster_progress_ops as cpo
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from sahara.utils import general as g
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from sahara.utils.openstack import heat
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conductor = c.API
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CONF = cfg.CONF
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LOG = logging.getLogger(__name__)
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class HeatEngine(e.Engine):
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def get_type_and_version(self):
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return "heat.1.1"
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def _add_volumes(self, ctx, cluster):
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for instance in g.get_instances(cluster):
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res_names = heat.client().resources.get(
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cluster.name, instance.instance_name).required_by
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for res_name in res_names:
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vol_res = heat.client().resources.get(cluster.name, res_name)
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if vol_res.resource_type == (('OS::Cinder::'
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'VolumeAttachment')):
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volume_id = vol_res.physical_resource_id
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conductor.append_volume(ctx, instance, volume_id)
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def create_cluster(self, cluster):
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self._update_rollback_strategy(cluster, shutdown=True)
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launcher = _CreateLauncher()
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target_count = self._get_ng_counts(cluster)
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self._nullify_ng_counts(cluster)
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launcher.launch_instances(cluster, target_count)
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ctx = context.ctx()
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cluster = conductor.cluster_get(ctx, cluster)
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self._add_volumes(ctx, cluster)
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self._update_rollback_strategy(cluster)
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def _get_ng_counts(self, cluster):
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count = {}
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for node_group in cluster.node_groups:
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count[node_group.id] = node_group.count
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return count
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def _nullify_ng_counts(self, cluster):
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ctx = context.ctx()
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for node_group in cluster.node_groups:
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conductor.node_group_update(ctx, node_group, {"count": 0})
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def scale_cluster(self, cluster, target_count):
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ctx = context.ctx()
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rollback_count = self._get_ng_counts(cluster)
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self._update_rollback_strategy(cluster, rollback_count=rollback_count,
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target_count=target_count)
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launcher = _ScaleLauncher()
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launcher.launch_instances(cluster, target_count)
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cluster = conductor.cluster_get(ctx, cluster)
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g.clean_cluster_from_empty_ng(cluster)
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self._update_rollback_strategy(cluster)
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return launcher.inst_ids
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def rollback_cluster(self, cluster, reason):
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rollback_info = cluster.rollback_info or {}
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self._update_rollback_strategy(cluster)
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if rollback_info.get('shutdown', False):
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self._rollback_cluster_creation(cluster, reason)
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return False
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rollback_count = rollback_info.get('rollback_count', {}).copy()
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target_count = rollback_info.get('target_count', {}).copy()
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if rollback_count or target_count:
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self._rollback_cluster_scaling(
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cluster, rollback_count, target_count, reason)
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return True
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return False
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def _update_rollback_strategy(self, cluster, shutdown=False,
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rollback_count=None, target_count=None):
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rollback_info = {}
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if shutdown:
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rollback_info['shutdown'] = shutdown
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if rollback_count:
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rollback_info['rollback_count'] = rollback_count
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if target_count:
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rollback_info['target_count'] = target_count
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cluster = conductor.cluster_update(
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context.ctx(), cluster, {'rollback_info': rollback_info})
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return cluster
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def _populate_cluster(self, cluster, stack):
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ctx = context.ctx()
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old_ids = [i.instance_id for i in g.get_instances(cluster)]
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new_ids = []
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for node_group in cluster.node_groups:
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nova_ids = stack.get_node_group_instances(node_group)
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for name, nova_id in nova_ids:
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if nova_id not in old_ids:
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instance_id = conductor.instance_add(
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ctx, node_group, {"instance_id": nova_id,
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"instance_name": name})
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new_ids.append(instance_id)
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return new_ids
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def _rollback_cluster_creation(self, cluster, ex):
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"""Shutdown all instances and update cluster status."""
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LOG.info(_LI("Cluster '%(name)s' creation rollback "
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"(reason: %(reason)s)"),
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{'name': cluster.name, 'reason': ex})
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self.shutdown_cluster(cluster)
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def _rollback_cluster_scaling(self, cluster, rollback_count,
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target_count, ex):
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"""Attempt to rollback cluster scaling.
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Our rollback policy for scaling is as follows:
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We shut down nodes created during scaling, but we don't try to
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to get back decommissioned nodes. I.e. during the rollback
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we only shut down nodes and not launch them. That approach should
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maximize the chance of rollback success.
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"""
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LOG.info(_LI("Cluster '%(name)s' scaling rollback "
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"(reason: %(reason)s)"),
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{'name': cluster.name, 'reason': ex})
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for ng in rollback_count:
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if rollback_count[ng] > target_count[ng]:
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rollback_count[ng] = target_count[ng]
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launcher = _RollbackLauncher()
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launcher.launch_instances(cluster, rollback_count)
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def shutdown_cluster(self, cluster):
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"""Shutdown specified cluster and all related resources."""
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try:
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heat.client().stacks.delete(cluster.name)
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stack = heat.get_stack(cluster.name)
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heat.wait_stack_completion(stack)
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except heat_exc.HTTPNotFound:
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LOG.warn(_LW('Did not found stack for cluster %s') % cluster.name)
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self._clean_job_executions(cluster)
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ctx = context.ctx()
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instances = g.get_instances(cluster)
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for inst in instances:
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conductor.instance_remove(ctx, inst)
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class _CreateLauncher(HeatEngine):
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STAGES = ["Spawning", "Waiting", "Preparing"]
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UPDATE_STACK = False
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DISABLE_ROLLBACK = True
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inst_ids = []
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@cpo.event_wrapper(
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True, step=_('Create Heat stack'), param=('cluster', 1))
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def create_instances(self, cluster, target_count):
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tmpl = heat.ClusterTemplate(cluster)
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self._configure_template(tmpl, cluster, target_count)
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stack = tmpl.instantiate(update_existing=self.UPDATE_STACK,
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disable_rollback=self.DISABLE_ROLLBACK)
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heat.wait_stack_completion(stack.heat_stack)
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self.inst_ids = self._populate_cluster(cluster, stack)
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def launch_instances(self, cluster, target_count):
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# create all instances
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cluster = g.change_cluster_status(cluster, self.STAGES[0])
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self.create_instances(cluster, target_count)
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# wait for all instances are up and networks ready
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cluster = g.change_cluster_status(cluster, self.STAGES[1])
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instances = g.get_instances(cluster, self.inst_ids)
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self._await_networks(cluster, instances)
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# prepare all instances
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cluster = g.change_cluster_status(cluster, self.STAGES[2])
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instances = g.get_instances(cluster, self.inst_ids)
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volumes.mount_to_instances(instances)
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self._configure_instances(cluster)
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def _configure_template(self, tmpl, cluster, target_count):
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ctx = context.ctx()
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for node_group in cluster.node_groups:
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count = target_count[node_group.id]
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tmpl.add_node_group_extra(node_group.id, count,
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self._generate_user_data_script)
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# if number of instances decreases, we need to drop
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# the excessive ones
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for i in range(count, node_group.count):
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conductor.instance_remove(ctx, node_group.instances[i])
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class _ScaleLauncher(_CreateLauncher):
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STAGES = ["Scaling: Spawning", "Scaling: Waiting", "Scaling: Preparing"]
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UPDATE_STACK = True
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DISABLE_ROLLBACK = False
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class _RollbackLauncher(_CreateLauncher):
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STAGES = ["Rollback: Spawning", "Rollback: Waiting", "Rollback: Preparing"]
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UPDATE_STACK = True
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