Add service for delayed calls

* Delayed call mechanism works over DB

Partially implements: blueprint mistral-delayed-messaging

Change-Id: Ic7a517640673633e8cd2963650df91953dc958aa

mistral/api/app.py

@@ -22,6 +22,7 @@ from mistral.api.hooks import engine
 from mistral import context as ctx
 from mistral.db.v1 import api as db_api
 from mistral.services import periodic
+from mistral.services import scheduler
 
 
 def get_pecan_config():
@@ -50,6 +51,7 @@ def setup_app(config=None, transport=None):
 
     # TODO(akuznetsov) move this to trigger scheduling to separate process
     periodic.setup(transport)
+    scheduler.setup()
 
     app = pecan.make_app(
         app_conf.pop('root'),

mistral/api/controllers/v1/workbook_definition.py

@@ -18,6 +18,7 @@ import pecan
 
 from mistral.db.v1 import api as db_api
 from mistral.openstack.common import log as logging
+from mistral.services import triggers
 from mistral.services import workbooks
 from mistral.utils import rest_utils
 
@@ -46,4 +47,6 @@ class WorkbookDefinitionController(pecan.rest.RestController):
 
         wb = workbooks.update_workbook_v1(workbook_name, {'definition': text})
 
+        triggers.create_associated_triggers(wb)
+
         return wb.definition

mistral/db/v2/api.py

@@ -152,3 +152,18 @@ def update_task(id, values):
 
 def delete_task(id):
     return IMPL.delete_task(id)
+
+
+# Delayed calls.
+
+
+def create_delayed_call(values):
+    return IMPL.create_delayed_call(values)
+
+
+def delete_delayed_call(id):
+    return IMPL.delete_delayed_call(id)
+
+
+def get_delayed_calls_to_start(time):
+    return IMPL.get_delayed_calls_to_start(time)

mistral/db/v2/sqlalchemy/api.py

@@ -370,3 +370,45 @@ def _get_tasks(**kwargs):
     query = b.model_query(models.Task)
 
     return query.filter_by(**kwargs).all()
+
+
+# Delayed calls.
+
+@b.session_aware()
+def create_delayed_call(values, session=None):
+    delayed_call = models.DelayedCall()
+    delayed_call.update(values.copy())
+
+    try:
+        delayed_call.save(session)
+    except db_exc.DBDuplicateEntry as e:
+        raise exc.DBDuplicateEntry("Duplicate entry for DelayedCall: %s"
+                                   % e.columns)
+
+    return delayed_call
+
+
+@b.session_aware()
+def delete_delayed_call(delayed_call_id, session=None):
+    delayed_call = _get_delayed_call(delayed_call_id)
+    if not delayed_call:
+        raise exc.NotFoundException("DelayedCall not found [delayed_call_id="
+                                    "%s]" % delayed_call_id)
+
+    session.delete(delayed_call)
+
+
+@b.session_aware()
+def get_delayed_calls_to_start(time, session=None):
+    query = b.model_query(models.DelayedCall)
+    query = query.filter(models.DelayedCall.execution_time < time)
+    query = query.order_by(models.DelayedCall.execution_time)
+
+    return query.all()
+
+
+@b.session_aware()
+def _get_delayed_call(delayed_call_id, session=None):
+    query = b.model_query(models.DelayedCall)
+
+    return query.filter_by(id=delayed_call_id).first()

mistral/db/v2/sqlalchemy/models.py

@@ -103,3 +103,16 @@ class Task(mb.MistralModelBase):
     # Relations.
     execution_id = sa.Column(sa.String(36), sa.ForeignKey('executions_v2.id'))
     execution = relationship('Execution', backref="tasks", lazy='joined')
+
+
+class DelayedCall(mb.MistralModelBase):
+    """Contains info about delayed calls."""
+
+    __tablename__ = 'delayed_calls_v2'
+
+    id = mb._id_column()
+    factory_method_path = sa.Column(sa.String(200), nullable=True)
+    target_method_name = sa.Column(sa.String(80), nullable=False)
+    method_arguments = sa.Column(st.JsonDictType())
+    auth_context = sa.Column(st.JsonDictType())
+    execution_time = sa.Column(sa.DateTime, nullable=False)

mistral/engine/drivers/default/executor.py

@@ -31,7 +31,8 @@ class DefaultExecutor(executor.Executor):
 
     def _log_action_exception(self, message, task_id, action, params, ex):
         LOG.exception("%s [task_id=%s, action='%s', params='%s']\n %s" %
-                      (message, task_id, action, params, ex))
+                      (message, str(task_id), str(action),
+                       str(params), str(ex)))
 
     def handle_task(self, cntx, task_id, action_name, params={}):
         """Handle the execution of the workbook task.

mistral/services/periodic.py

@@ -20,7 +20,7 @@ from mistral import engine
 from mistral.openstack.common import log
 from mistral.openstack.common import periodic_task
 from mistral.openstack.common import threadgroup
-from mistral.services import scheduler as sched
+from mistral.services import triggers
 from mistral.services import trusts
 from mistral.workbook import parser as spec_parser
 
@@ -40,7 +40,7 @@ class MistralPeriodicTasks(periodic_task.PeriodicTasks):
     def scheduler_triggers(self, ctx):
         LOG.debug('Processing next Scheduler triggers.')
 
-        for trigger in sched.get_next_triggers():
+        for trigger in triggers.get_next_triggers():
             # Setup admin context before schedule triggers.
             context.set_ctx(ctx)
 
@@ -54,7 +54,7 @@ class MistralPeriodicTasks(periodic_task.PeriodicTasks):
 
                 self.engine.start_workflow_execution(wb['name'], task)
             finally:
-                sched.set_next_execution_time(trigger)
+                triggers.set_next_execution_time(trigger)
                 context.set_ctx(None)
 
 

mistral/services/scheduler.py

@@ -1,6 +1,4 @@
-# -*- coding: utf-8 -*-
-#
-# Copyright 2013 - Mirantis, Inc.
+# Copyright 2014 - Mirantis, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -14,71 +12,87 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
-from croniter import croniter
+
 import datetime
-from mistral.db.v1 import api as db_api
-from mistral.workbook import parser as spec_parser
+
+from mistral import context
+from mistral.db.v2 import api as db_api
+from mistral.openstack.common import importutils
+from mistral.openstack.common import log
+from mistral.openstack.common import periodic_task
+from mistral.openstack.common import threadgroup
 
 
-def get_next_triggers():
-    return db_api.get_next_triggers(datetime.datetime.now() +
-                                    datetime.timedelta(0, 2))
+LOG = log.getLogger(__name__)
 
 
-def set_next_execution_time(trigger):
-    base = trigger['next_execution_time']
-    cron = croniter(trigger['pattern'], base)
+def schedule_call(factory_method_path, target_method_name,
+                  run_after, **method_args):
+    """Add this call specification to DB, and then after run_after
+    seconds service CallScheduler invokes the target_method.
 
-    return db_api.trigger_update(trigger['id'], {
-        'next_execution_time': cron.get_next(datetime.datetime)
-    })
+    :param factory_method_path: Full python-specific path to
+    factory method for target object construction.
+    :param target_method_name: Name of target object method which
+    will be invoked.
+    :param run_after: Value in seconds.
+    :param method_args: Target method keyword arguments.
+    :return: None
+    """
+    ctx = context.ctx().to_dict() if context.has_ctx() else {}
+
+    execution_time = (datetime.datetime.now()
+                      + datetime.timedelta(seconds=run_after))
+
+    values = {
+        'factory_method_path': factory_method_path,
+        'target_method_name': target_method_name,
+        'execution_time': execution_time,
+        'auth_context': ctx,
+        'method_arguments': method_args
+    }
+
+    db_api.create_delayed_call(values)
 
 
-def _get_next_execution_time(pattern, start_time):
-    return croniter(pattern, start_time).get_next(datetime.datetime)
+class CallScheduler(periodic_task.PeriodicTasks):
+    @periodic_task.periodic_task(spacing=1)
+    def run_delayed_calls(self, ctx=None):
+        LOG.debug('Processing next delayed calls.')
+
+        datetime_filter = (datetime.datetime.now()
+                           + datetime.timedelta(seconds=1))
+        delayed_calls = db_api.get_delayed_calls_to_start(datetime_filter)
+
+        for call in delayed_calls:
+            ctx = context.MistralContext(call.auth_context)
+            context.set_ctx(ctx)
+
+            if call.factory_method_path:
+                factory = importutils.import_class(call.factory_method_path)
+                target_object = factory()
+                target_method = getattr(target_object,
+                                        call.target_method_name)
+            else:
+                target_method = importutils.import_class(
+                    call.target_method_name)
+            try:
+                # Call the method.
+                target_method(**call.method_arguments)
+            except Exception as e:
+                LOG.debug("Exception was thrown during the "
+                          "delayed call %s - %s", call, e)
+            finally:
+                # After call, delete this delayed call from DB.
+                db_api.delete_delayed_call(call.id)
 
 
-def create_trigger(name, pattern, workbook_name, start_time=None):
-    if not start_time:
-        start_time = datetime.datetime.now()
+def setup():
+    tg = threadgroup.ThreadGroup()
+    pt = CallScheduler()
 
-    return db_api.trigger_create({
-        "name": name,
-        "pattern": pattern,
-        "next_execution_time": _get_next_execution_time(pattern, start_time),
-        "workbook_name": workbook_name
-    })
-
-
-def create_associated_triggers(db_workbook):
-    if not db_workbook['definition']:
-        return
-
-    wb_spec = spec_parser.get_workbook_spec_from_yaml(
-        db_workbook['definition']
-    )
-
-    triggers = wb_spec.get_triggers()
-
-    # Prepare all triggers data in advance to make db transaction shorter.
-    db_triggers = []
-
-    for e in triggers:
-        pattern = e['parameters']['cron-pattern']
-        next_time = _get_next_execution_time(pattern, datetime.datetime.now())
-        db_triggers.append({
-            "name": e['name'],
-            "pattern": pattern,
-            "next_execution_time": next_time,
-            "workbook_name": db_workbook['name']
-        })
-
-    db_api.start_tx()
-
-    try:
-        for e in db_triggers:
-            db_api.trigger_create(e)
-
-        db_api.commit_tx()
-    finally:
-        db_api.end_tx()
+    tg.add_dynamic_timer(
+        pt.run_periodic_tasks,
+        initial_delay=None,
+        periodic_interval_max=1,
+        context=None)

mistral/services/triggers.py

@@ -0,0 +1,84 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright 2013 - Mirantis, Inc.
+#
+#    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.
+
+from croniter import croniter
+import datetime
+from mistral.db.v1 import api as db_api
+from mistral.workbook import parser as spec_parser
+
+
+def get_next_triggers():
+    return db_api.get_next_triggers(datetime.datetime.now() +
+                                    datetime.timedelta(0, 2))
+
+
+def set_next_execution_time(trigger):
+    base = trigger['next_execution_time']
+    cron = croniter(trigger['pattern'], base)
+
+    return db_api.trigger_update(trigger['id'], {
+        'next_execution_time': cron.get_next(datetime.datetime)
+    })
+
+
+def _get_next_execution_time(pattern, start_time):
+    return croniter(pattern, start_time).get_next(datetime.datetime)
+
+
+def create_trigger(name, pattern, workbook_name, start_time=None):
+    if not start_time:
+        start_time = datetime.datetime.now()
+
+    return db_api.trigger_create({
+        "name": name,
+        "pattern": pattern,
+        "next_execution_time": _get_next_execution_time(pattern, start_time),
+        "workbook_name": workbook_name
+    })
+
+
+def create_associated_triggers(db_workbook):
+    if not db_workbook.definition:
+        return
+
+    wb_spec = spec_parser.get_workbook_spec_from_yaml(
+        db_workbook.definition
+    )
+
+    triggers = wb_spec.get_triggers()
+
+    # Prepare all triggers data in advance to make db transaction shorter.
+    db_triggers = []
+
+    for e in triggers:
+        pattern = e['parameters']['cron-pattern']
+        next_time = _get_next_execution_time(pattern, datetime.datetime.now())
+        db_triggers.append({
+            "name": e['name'],
+            "pattern": pattern,
+            "next_execution_time": next_time,
+            "workbook_name": db_workbook.name
+        })
+
+    db_api.start_tx()
+
+    try:
+        for e in db_triggers:
+            db_api.trigger_create(e)
+
+        db_api.commit_tx()
+    finally:
+        db_api.end_tx()

mistral/services/workbooks.py

@@ -20,7 +20,7 @@ from mistral import context
 from mistral.db.v1 import api as db_api_v1
 from mistral.db.v2 import api as db_api_v2
 from mistral import exceptions as exc
-from mistral.services import scheduler
+from mistral.services import triggers
 from mistral.services import trusts
 from mistral.workbook import parser as spec_parser
 
@@ -35,7 +35,7 @@ def update_workbook_v1(workbook_name, values):
     wb_db = db_api_v1.workbook_update(workbook_name, values)
 
     if 'definition' in values:
-        scheduler.create_associated_triggers(wb_db)
+        triggers.create_associated_triggers(wb_db)
 
     return wb_db
 

mistral/tests/unit/services/test_scheduler.py

@@ -0,0 +1,92 @@
+# Copyright 2014 - Mirantis, Inc.
+#
+#    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 datetime
+import eventlet
+import mock
+
+from mistral.db.v2 import api as db_api
+from mistral.services import scheduler
+from mistral.tests import base
+
+
+def factory_method():
+    pass
+
+
+class SchedulerServiceTest(base.DbTestCase):
+    def setUp(self):
+        super(SchedulerServiceTest, self).setUp()
+        scheduler.setup()
+
+    @mock.patch('mistral.tests.unit.services.test_scheduler.factory_method')
+    def test_scheduler_with_factory(self, factory):
+        factory_method = ('mistral.tests.unit.services.'
+                          'test_scheduler.factory_method')
+        target_method = 'run_something'
+        method_args = {'name': 'task', 'id': '123'}
+        delay = 0.5
+
+        scheduler.schedule_call(factory_method,
+                                target_method,
+                                delay,
+                                **method_args)
+
+        time_filter = datetime.datetime.now() + datetime.timedelta(seconds=1)
+        calls = db_api.get_delayed_calls_to_start(time_filter)
+
+        self.assertEqual(1, len(calls))
+        call = self._assert_single_item(calls,
+                                        target_method_name=target_method)
+
+        self.assertIn('name', call['method_arguments'])
+
+        eventlet.sleep(delay * 2)
+
+        factory().run_something.called_once_with(name='task', id='123')
+
+        time_filter = datetime.datetime.now() + datetime.timedelta(seconds=1)
+        calls = db_api.get_delayed_calls_to_start(time_filter)
+
+        self.assertEqual(0, len(calls))
+
+    @mock.patch('mistral.tests.unit.services.test_scheduler.factory_method')
+    def test_scheduler_without_factory(self, method):
+        target_method = ('mistral.tests.unit.services.'
+                         'test_scheduler.factory_method')
+        method_args = {'name': 'task', 'id': '321'}
+        delay = 0.5
+
+        scheduler.schedule_call(None,
+                                target_method,
+                                delay,
+                                **method_args)
+
+        time_filter = datetime.datetime.now() + datetime.timedelta(seconds=1)
+        calls = db_api.get_delayed_calls_to_start(time_filter)
+
+        self.assertEqual(1, len(calls))
+        call = self._assert_single_item(calls,
+                                        target_method_name=target_method)
+
+        self.assertIn('name', call['method_arguments'])
+
+        eventlet.sleep(delay * 2)
+
+        method().called_once_with(name='task', id='321')
+
+        time_filter = datetime.datetime.now() + datetime.timedelta(seconds=1)
+        calls = db_api.get_delayed_calls_to_start(time_filter)
+
+        self.assertEqual(0, len(calls))

mistral/tests/unit/test_trigger_service.py

@@ -17,7 +17,7 @@
 import datetime
 
 from mistral.openstack.common import timeutils
-from mistral.services import scheduler as s
+from mistral.services import triggers as t
 from mistral.tests import base
 
 
@@ -30,30 +30,30 @@ SAMPLE_TRIGGER = {
 }
 
 
-class SchedulerTest(base.DbTestCase):
+class TriggerServiceTest(base.DbTestCase):
     def setUp(self):
-        super(SchedulerTest, self).setUp()
+        super(TriggerServiceTest, self).setUp()
         self.wb_name = "My workbook"
 
     def test_trigger_create_and_update(self):
         base = datetime.datetime(2010, 8, 25)
         next_trigger = datetime.datetime(2010, 8, 25, 0, 5)
-        trigger = s.create_trigger("test", "*/5 * * * *", self.wb_name, base)
+        trigger = t.create_trigger("test", "*/5 * * * *", self.wb_name, base)
         self.assertEqual(trigger['next_execution_time'], next_trigger)
 
-        trigger = s.set_next_execution_time(trigger)
+        trigger = t.set_next_execution_time(trigger)
         next_trigger = datetime.datetime(2010, 8, 25, 0, 10)
         self.assertEqual(trigger['next_execution_time'], next_trigger)
 
     def test_get_trigger_in_correct_orders(self):
         base = datetime.datetime(2010, 8, 25)
-        s.create_trigger("test1", "*/5 * * * *", self.wb_name, base)
+        t.create_trigger("test1", "*/5 * * * *", self.wb_name, base)
         base = datetime.datetime(2010, 8, 22)
-        s.create_trigger("test2", "*/5 * * * *", self.wb_name, base)
+        t.create_trigger("test2", "*/5 * * * *", self.wb_name, base)
         base = datetime.datetime(2010, 9, 21)
-        s.create_trigger("test3", "*/5 * * * *", self.wb_name, base)
+        t.create_trigger("test3", "*/5 * * * *", self.wb_name, base)
         base = datetime.datetime.now() + datetime.timedelta(0, 50)
-        s.create_trigger("test4", "*/5 * * * *", self.wb_name, base)
-        triggersName = [e['name'] for e in s.get_next_triggers()]
+        t.create_trigger("test4", "*/5 * * * *", self.wb_name, base)
+        triggersName = [e['name'] for e in t.get_next_triggers()]
 
         self.assertEqual(triggersName, ["test2", "test1", "test3"])

mistral/tests/unit/triggers/test_triggers.py

@@ -17,7 +17,7 @@
 import pkg_resources as pkg
 
 from mistral.db.v1 import api as db_api
-from mistral.services import scheduler
+from mistral.services import triggers as trigger_srv
 from mistral.tests import base
 from mistral import version
 
@@ -36,7 +36,9 @@ class TriggersTest(base.DbTestCase):
             'definition': self.doc
         }
 
-        scheduler.create_associated_triggers(workbook)
+        wb_db = db_api.workbook_create(workbook)
+
+        trigger_srv.create_associated_triggers(wb_db)
 
         triggers = db_api.triggers_get(workbook_name='my_workbook')