141 lines
4.5 KiB
Python
141 lines
4.5 KiB
Python
# Copyright 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 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 oslo_config import cfg
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from oslo_log import log as logging
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from oslo_service import periodic_task
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from oslo_service import threadgroup
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from mistral import context as auth_ctx
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from mistral.db.v2 import api as db_api_v2
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from mistral.engine.rpc_backend import rpc
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from mistral import exceptions as exc
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from mistral.services import security
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from mistral.services import triggers
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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# {periodic_task: thread_group}
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_periodic_tasks = {}
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class MistralPeriodicTasks(periodic_task.PeriodicTasks):
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@periodic_task.periodic_task(spacing=1, run_immediately=True)
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def process_cron_triggers_v2(self, ctx):
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for t in triggers.get_next_cron_triggers():
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LOG.debug("Processing cron trigger: %s" % t)
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# Setup admin context before schedule triggers.
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ctx = security.create_context(t.trust_id, t.project_id)
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auth_ctx.set_ctx(ctx)
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LOG.debug("Cron trigger security context: %s" % ctx)
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try:
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# Try to advance the cron trigger next_execution_time and
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# remaining_executions if relevant.
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modified = advance_cron_trigger(t)
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# If cron trigger was not already modified by another engine.
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if modified:
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LOG.debug(
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"Starting workflow '%s' by cron trigger '%s'",
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t.workflow.name, t.name
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)
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rpc.get_engine_client().start_workflow(
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t.workflow.name,
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t.workflow_input,
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description="Workflow execution created "
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"by cron trigger.",
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**t.workflow_params
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)
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except Exception:
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# Log and continue to next cron trigger.
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LOG.exception("Failed to process cron trigger %s" % str(t))
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finally:
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auth_ctx.set_ctx(None)
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def advance_cron_trigger(t):
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modified_count = 0
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try:
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# If the cron trigger is defined with limited execution count.
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if t.remaining_executions is not None and t.remaining_executions > 0:
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t.remaining_executions -= 1
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# If this is the last execution.
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if t.remaining_executions == 0:
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modified_count = db_api_v2.delete_cron_trigger(t.name)
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else: # if remaining execution = None or > 0.
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next_time = triggers.get_next_execution_time(
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t.pattern,
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t.next_execution_time
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)
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# Update the cron trigger with next execution details
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# only if it wasn't already updated by a different process.
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updated, modified_count = db_api_v2.update_cron_trigger(
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t.name,
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{
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'next_execution_time': next_time,
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'remaining_executions': t.remaining_executions
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},
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query_filter={
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'next_execution_time': t.next_execution_time
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}
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)
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except exc.DBEntityNotFoundError as e:
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# Cron trigger was probably already deleted by a different process.
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LOG.debug(
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"Cron trigger named '%s' does not exist anymore: %s",
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t.name, str(e)
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)
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# Return True if this engine was able to modify the cron trigger in DB.
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return modified_count > 0
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def setup():
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tg = threadgroup.ThreadGroup()
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pt = MistralPeriodicTasks(CONF)
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ctx = auth_ctx.MistralContext(
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user_id=None,
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project_id=None,
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auth_token=None,
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is_admin=True
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)
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tg.add_dynamic_timer(
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pt.run_periodic_tasks,
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initial_delay=None,
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periodic_interval_max=1,
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context=ctx
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)
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_periodic_tasks[pt] = tg
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return tg
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def stop_all_periodic_tasks():
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for pt, tg in _periodic_tasks.items():
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tg.stop()
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del _periodic_tasks[pt]
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