Implement notification of execution events

Introduce execution events and notification server and plugins for
publishing these events for consumers. Event notification is defined per
workflow execution and can be configured to notify on all the events or
only for specific events.

Change-Id: I9820bdc4792a374dad9ad5310f84cd7aaddab8ca
Implements: blueprint mistral-execution-event-subscription

mistral/api/controllers/v2/execution.py

@@ -2,6 +2,7 @@
 # Copyright 2015 - StackStorm, Inc.
 # Copyright 2015 Huawei Technologies Co., Ltd.
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -258,8 +259,8 @@ class ExecutionsController(rest.RestController):
             result_exec_dict.get('workflow_namespace', ''),
             exec_id,
             result_exec_dict.get('input'),
-            result_exec_dict.get('description', ''),
-            **result_exec_dict.get('params') or {}
+            description=result_exec_dict.get('description', ''),
+            **result_exec_dict.get('params', {})
         )
 
         return resources.Execution.from_dict(result)

mistral/api/controllers/v2/resources.py

@@ -1,4 +1,5 @@
 # Copyright 2013 - Mirantis, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -284,7 +285,8 @@ class Execution(resource.Resource):
 
     @classmethod
     def sample(cls):
-        return cls(id='123e4567-e89b-12d3-a456-426655440000',
+        return cls(
+            id='123e4567-e89b-12d3-a456-426655440000',
             workflow_name='flow',
             workflow_namespace='some_namespace',
             workflow_id='123e4567-e89b-12d3-a456-426655441111',
@@ -293,9 +295,29 @@ class Execution(resource.Resource):
             state='SUCCESS',
             input={},
             output={},
-                   params={'env': {'k1': 'abc', 'k2': 123}},
+            params={
+                'env': {'k1': 'abc', 'k2': 123},
+                'notify': [
+                    {
+                        'type': 'webhook',
+                        'url': 'http://endpoint/of/webhook',
+                        'headers': {
+                            'Content-Type': 'application/json',
+                            'X-Auth-Token': '123456789'
+                        }
+                    },
+                    {
+                        'type': 'queue',
+                        'topic': 'failover_queue',
+                        'backend': 'rabbitmq',
+                        'host': '127.0.0.1',
+                        'port': 5432
+                    }
+                ]
+            },
             created_at='1970-01-01T00:00:00.000000',
-                   updated_at='1970-01-01T00:00:00.000000')
+            updated_at='1970-01-01T00:00:00.000000'
+        )
 
 
 class Executions(resource.ResourceList):

mistral/cmd/launch.py

@@ -1,5 +1,6 @@
 #!/usr/bin/env python
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -46,6 +47,7 @@ from mistral import config
 from mistral.engine import engine_server
 from mistral.event_engine import event_engine_server
 from mistral.executors import executor_server
+from mistral.notifiers import notification_server
 from mistral.rpc import base as rpc
 from mistral import version
 
@@ -93,6 +95,10 @@ def launch_event_engine():
     launch_thread(event_engine_server.get_oslo_service())
 
 
+def launch_notifier():
+    launch_thread(notification_server.get_oslo_service())
+
+
 def launch_api():
     server = api_service.WSGIService('mistral_api')
     launch_process(server, workers=server.workers)
@@ -118,7 +124,8 @@ LAUNCH_OPTIONS = {
     'api': launch_api,
     'engine': launch_engine,
     'executor': launch_executor,
-    'event-engine': launch_event_engine
+    'event-engine': launch_event_engine,
+    'notifier': launch_notifier
 }
 
 

mistral/config.py

@@ -1,5 +1,6 @@
 # Copyright 2013 - Mirantis, Inc.
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -300,6 +301,37 @@ event_engine_opts = [
     ),
 ]
 
+notifier_opts = [
+    cfg.StrOpt(
+        'type',
+        choices=['local', 'remote'],
+        default='remote',
+        help=(
+            'Type of notifier. Use local to run the notifier within the '
+            'engine server. Use remote if the notifier is launched as '
+            'a separate server to process events.'
+        )
+    ),
+    cfg.StrOpt(
+        'host',
+        default='0.0.0.0',
+        help=_('Name of the notifier node. This can be an opaque '
+               'identifier. It is not necessarily a hostname, '
+               'FQDN, or IP address.')
+    ),
+    cfg.StrOpt(
+        'topic',
+        default='mistral_notifier',
+        help=_('The message topic that the notifier server listens on.')
+    ),
+    cfg.ListOpt(
+        'notify',
+        item_type=eval,
+        bounds=True,
+        help=_('List of publishers to publish notification.')
+    )
+]
+
 execution_expiration_policy_opts = [
     cfg.IntOpt(
         'evaluation_interval',
@@ -425,6 +457,7 @@ EXECUTOR_GROUP = 'executor'
 SCHEDULER_GROUP = 'scheduler'
 CRON_TRIGGER_GROUP = 'cron_trigger'
 EVENT_ENGINE_GROUP = 'event_engine'
+NOTIFIER_GROUP = 'notifier'
 PECAN_GROUP = 'pecan'
 COORDINATION_GROUP = 'coordination'
 EXECUTION_EXPIRATION_POLICY_GROUP = 'execution_expiration_policy'
@@ -450,6 +483,7 @@ CONF.register_opts(
     group=EXECUTION_EXPIRATION_POLICY_GROUP
 )
 CONF.register_opts(event_engine_opts, group=EVENT_ENGINE_GROUP)
+CONF.register_opts(notifier_opts, group=NOTIFIER_GROUP)
 CONF.register_opts(pecan_opts, group=PECAN_GROUP)
 CONF.register_opts(coordination_opts, group=COORDINATION_GROUP)
 CONF.register_opts(profiler_opts, group=PROFILER_GROUP)
@@ -494,6 +528,7 @@ def list_opts():
         (EVENT_ENGINE_GROUP, event_engine_opts),
         (SCHEDULER_GROUP, scheduler_opts),
         (CRON_TRIGGER_GROUP, cron_trigger_opts),
+        (NOTIFIER_GROUP, notifier_opts),
         (PECAN_GROUP, pecan_opts),
         (COORDINATION_GROUP, coordination_opts),
         (EXECUTION_EXPIRATION_POLICY_GROUP, execution_expiration_policy_opts),

mistral/engine/actions.py

@@ -1,5 +1,6 @@
 # Copyright 2016 - Nokia Networks.
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -558,6 +559,9 @@ class WorkflowAction(Action):
             wf_params['env'] = parent_wf_ex.params['env']
             wf_params['evaluate_env'] = parent_wf_ex.params.get('evaluate_env')
 
+        if 'notify' in parent_wf_ex.params:
+            wf_params['notify'] = parent_wf_ex.params['notify']
+
         for k, v in list(input_dict.items()):
             if k not in wf_spec.get_input():
                 wf_params[k] = v

mistral/engine/default_engine.py

@@ -1,6 +1,7 @@
 # Copyright 2013 - Mirantis, Inc.
 # Copyright 2015 - StackStorm, Inc.
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -14,6 +15,7 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
+from oslo_config import cfg
 from osprofiler import profiler
 
 from mistral.db import utils as db_utils
@@ -42,6 +44,12 @@ class DefaultEngine(base.Engine):
         if wf_namespace:
             params['namespace'] = wf_namespace
 
+        if cfg.CONF.notifier.notify:
+            if 'notify' not in params or not params['notify']:
+                params['notify'] = []
+
+            params['notify'].extend(cfg.CONF.notifier.notify)
+
         try:
             with db_api.transaction():
                 wf_ex = wf_handler.start_workflow(

mistral/engine/tasks.py

@@ -1,5 +1,6 @@
 # Copyright 2016 - Nokia Networks.
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -15,6 +16,7 @@
 
 import abc
 import copy
+from oslo_config import cfg
 from oslo_log import log as logging
 from osprofiler import profiler
 import six
@@ -25,6 +27,8 @@ from mistral.engine import dispatcher
 from mistral.engine import policies
 from mistral import exceptions as exc
 from mistral import expressions as expr
+from mistral.notifiers import base as notif
+from mistral.notifiers import notification_events as events
 from mistral import utils
 from mistral.utils import wf_trace
 from mistral.workflow import base as wf_base
@@ -57,6 +61,23 @@ class Task(object):
         self.created = False
         self.state_changed = False
 
+    def notify(self, old_task_state, new_task_state):
+        publishers = self.wf_ex.params.get('notify')
+
+        if not publishers and not isinstance(publishers, list):
+            return
+
+        notifier = notif.get_notifier(cfg.CONF.notifier.type)
+        event = events.identify_task_event(old_task_state, new_task_state)
+
+        notifier.notify(
+            self.task_ex.id,
+            self.task_ex.to_dict(),
+            event,
+            self.task_ex.updated_at,
+            publishers
+        )
+
     def is_completed(self):
         return self.task_ex and states.is_completed(self.task_ex.state)
 
@@ -177,8 +198,15 @@ class Task(object):
 
         assert self.task_ex
 
+        # Record the current task state.
+        old_task_state = self.task_ex.state
+
         # Ignore if task already completed.
         if self.is_completed():
+            # Publish task event again so subscribers know
+            # task completed state is being processed again.
+            self.notify(old_task_state, self.task_ex.state)
+
             return
 
         # If we were unable to change the task state it means that it was
@@ -205,6 +233,9 @@ class Task(object):
         # If workflow is paused we shouldn't schedule new commands
         # and mark task as processed.
         if states.is_paused(self.wf_ex.state):
+            # Publish task event even if the workflow is paused.
+            self.notify(old_task_state, self.task_ex.state)
+
             return
 
         wf_ctrl = wf_base.get_controller(self.wf_ex, self.wf_spec)
@@ -216,6 +247,9 @@ class Task(object):
         # upon its completion.
         self.task_ex.processed = True
 
+        # Publish task event.
+        self.notify(old_task_state, self.task_ex.state)
+
         dispatcher.dispatch_workflow_commands(self.wf_ex, cmds)
 
     @profiler.trace('task-update')
@@ -230,8 +264,15 @@ class Task(object):
 
         assert self.task_ex
 
+        # Record the current task state.
+        old_task_state = self.task_ex.state
+
         # Ignore if task already completed.
         if states.is_completed(self.task_ex.state):
+            # Publish task event again so subscribers know
+            # task completed state is being processed again.
+            self.notify(old_task_state, self.task_ex.state)
+
             return
 
         # Update only if state transition is valid.
@@ -247,6 +288,9 @@ class Task(object):
 
         self.set_state(state, state_info)
 
+        # Publish event.
+        self.notify(old_task_state, self.task_ex.state)
+
     def _before_task_start(self):
         policies_spec = self.task_spec.get_policies()
 
@@ -340,6 +384,9 @@ class RegularTask(Task):
 
         self._create_task_execution()
 
+        # Publish event.
+        self.notify(None, self.task_ex.state)
+
         LOG.debug(
             'Starting task [workflow=%s, task=%s, init_state=%s]',
             self.wf_ex.name,
@@ -367,8 +414,14 @@ class RegularTask(Task):
                 'Rerunning succeeded tasks is not supported.'
             )
 
+        # Record the current task state.
+        old_task_state = self.task_ex.state
+
         self.set_state(states.RUNNING, None, processed=False)
 
+        # Publish event.
+        self.notify(old_task_state, self.task_ex.state)
+
         self._update_inbound_context()
         self._update_triggered_by()
         self._reset_actions()

mistral/engine/workflows.py

@@ -1,5 +1,6 @@
 # Copyright 2016 - Nokia Networks.
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -26,6 +27,8 @@ from mistral.engine import dispatcher
 from mistral.engine import utils as engine_utils
 from mistral import exceptions as exc
 from mistral.lang import parser as spec_parser
+from mistral.notifiers import base as notif
+from mistral.notifiers import notification_events as events
 from mistral.services import triggers
 from mistral.services import workflows as wf_service
 from mistral import utils
@@ -61,6 +64,22 @@ class Workflow(object):
         else:
             self.wf_spec = None
 
+    def notify(self, event):
+        publishers = self.wf_ex.params.get('notify')
+
+        if not publishers and not isinstance(publishers, list):
+            return
+
+        notifier = notif.get_notifier(cfg.CONF.notifier.type)
+
+        notifier.notify(
+            self.wf_ex.id,
+            self.wf_ex.to_dict(),
+            event,
+            self.wf_ex.updated_at,
+            publishers
+        )
+
     @profiler.trace('workflow-start')
     def start(self, wf_def, wf_ex_id, input_dict, desc='', params=None):
         """Start workflow.
@@ -100,6 +119,9 @@ class Workflow(object):
 
         self.set_state(states.RUNNING)
 
+        # Publish event as soon as state is set to running.
+        self.notify(events.WORKFLOW_LAUNCHED)
+
         wf_ctrl = wf_base.get_controller(self.wf_ex, self.wf_spec)
 
         dispatcher.dispatch_workflow_commands(
@@ -113,7 +135,6 @@ class Workflow(object):
         :param state: New workflow state.
         :param msg: Additional explaining message.
         """
-
         assert self.wf_ex
 
         if state == states.SUCCESS:
@@ -137,6 +158,9 @@ class Workflow(object):
         # Set the state of this workflow to paused.
         self.set_state(states.PAUSED, state_info=msg)
 
+        # Publish event.
+        self.notify(events.WORKFLOW_PAUSED)
+
         # If workflow execution is a subworkflow,
         # schedule update to the task execution.
         if self.wf_ex.task_execution_id:
@@ -144,8 +168,6 @@ class Workflow(object):
             from mistral.engine import task_handler
             task_handler.schedule_on_action_update(self.wf_ex)
 
-        return
-
     def resume(self, env=None):
         """Resume workflow.
 
@@ -158,6 +180,9 @@ class Workflow(object):
 
         self.set_state(states.RUNNING)
 
+        # Publish event.
+        self.notify(events.WORKFLOW_RESUMED)
+
         wf_ctrl = wf_base.get_controller(self.wf_ex)
 
         # Calculate commands to process next.
@@ -403,6 +428,9 @@ class Workflow(object):
         # Set workflow execution to success until after output is evaluated.
         self.set_state(states.SUCCESS, msg)
 
+        # Publish event.
+        self.notify(events.WORKFLOW_SUCCEEDED)
+
         if self.wf_ex.task_execution_id:
             self._send_result_to_parent_workflow()
 
@@ -448,6 +476,9 @@ class Workflow(object):
 
         self.wf_ex.output = merge_dicts({'result': msg}, output_on_error)
 
+        # Publish event.
+        self.notify(events.WORKFLOW_FAILED)
+
         if self.wf_ex.task_execution_id:
             self._send_result_to_parent_workflow()
 
@@ -466,6 +497,9 @@ class Workflow(object):
 
         self.wf_ex.output = {'result': msg}
 
+        # Publish event.
+        self.notify(events.WORKFLOW_CANCELLED)
+
         if self.wf_ex.task_execution_id:
             self._send_result_to_parent_workflow()
 

mistral/notifiers/base.py

@@ -0,0 +1,81 @@
+# Copyright 2018 - Extreme Networks, 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 abc
+import six
+
+from oslo_log import log as logging
+from stevedore import driver
+
+
+LOG = logging.getLogger(__name__)
+
+_NOTIFIERS = {}
+_NOTIFICATION_PUBLISHERS = {}
+
+
+def cleanup():
+    global _NOTIFIERS
+    global _NOTIFICATION_PUBLISHERS
+
+    _NOTIFIERS = {}
+    _NOTIFICATION_PUBLISHERS = {}
+
+
+def get_notifier(notifier_name):
+    global _NOTIFIERS
+
+    if not _NOTIFIERS.get(notifier_name):
+        mgr = driver.DriverManager(
+            'mistral.notifiers',
+            notifier_name,
+            invoke_on_load=True
+        )
+
+        _NOTIFIERS[notifier_name] = mgr.driver
+
+    return _NOTIFIERS[notifier_name]
+
+
+def get_notification_publisher(publisher_name):
+    global _NOTIFICATION_PUBLISHERS
+
+    if not _NOTIFICATION_PUBLISHERS.get(publisher_name):
+        mgr = driver.DriverManager(
+            'mistral.notification.publishers',
+            publisher_name,
+            invoke_on_load=True
+        )
+
+        _NOTIFICATION_PUBLISHERS[publisher_name] = mgr.driver
+
+    return _NOTIFICATION_PUBLISHERS[publisher_name]
+
+
+@six.add_metaclass(abc.ABCMeta)
+class Notifier(object):
+    """Notifier interface."""
+
+    @abc.abstractmethod
+    def notify(self, ex_id, data, event, timestamp, **kwargs):
+        raise NotImplementedError()
+
+
+@six.add_metaclass(abc.ABCMeta)
+class NotificationPublisher(object):
+    """Notifier plugin interface."""
+
+    @abc.abstractmethod
+    def publish(self, ex_id, data, event, timestamp, **kwargs):
+        raise NotImplementedError()

mistral/notifiers/default_notifier.py

@@ -0,0 +1,44 @@
+# Copyright 2018 - Extreme Networks, 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 copy
+
+from oslo_log import log as logging
+
+from mistral.notifiers import base
+
+
+LOG = logging.getLogger(__name__)
+
+
+class DefaultNotifier(base.Notifier):
+    """Local notifier that process notification request."""
+
+    def notify(self, ex_id, data, event, timestamp, publishers):
+        for entry in publishers:
+            params = copy.deepcopy(entry)
+            publisher_name = params.pop('type', None)
+
+            if not publisher_name:
+                LOG.error('Notification publisher type is not specified.')
+                continue
+
+            try:
+                publisher = base.get_notification_publisher(publisher_name)
+                publisher.publish(ex_id, data, event, timestamp, **params)
+            except Exception:
+                LOG.exception(
+                    'Unable to process event for publisher "%s".',
+                    publisher_name
+                )

mistral/notifiers/notification_events.py

@@ -0,0 +1,82 @@
+# Copyright 2018 - Extreme Networks, 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 mistral.workflow import states
+
+
+WORKFLOW_LAUNCHED = 'WORKFLOW_LAUNCHED'
+WORKFLOW_SUCCEEDED = 'WORKFLOW_SUCCEEDED'
+WORKFLOW_FAILED = 'WORKFLOW_FAILED'
+WORKFLOW_CANCELLED = 'WORKFLOW_CANCELLED'
+WORKFLOW_PAUSED = 'WORKFLOW_PAUSED'
+WORKFLOW_RESUMED = 'WORKFLOW_RESUMED'
+
+WORKFLOWS = [
+    WORKFLOW_LAUNCHED,
+    WORKFLOW_SUCCEEDED,
+    WORKFLOW_FAILED,
+    WORKFLOW_CANCELLED,
+    WORKFLOW_PAUSED,
+    WORKFLOW_RESUMED
+]
+
+TASK_LAUNCHED = 'TASK_LAUNCHED'
+TASK_SUCCEEDED = 'TASK_SUCCEEDED'
+TASK_FAILED = 'TASK_FAILED'
+TASK_CANCELLED = 'TASK_CANCELLED'
+TASK_PAUSED = 'TASK_PAUSED'
+TASK_RESUMED = 'TASK_RESUMED'
+
+TASKS = [
+    TASK_LAUNCHED,
+    TASK_SUCCEEDED,
+    TASK_FAILED,
+    TASK_CANCELLED,
+    TASK_PAUSED,
+    TASK_RESUMED
+]
+
+EVENTS = WORKFLOWS + TASKS
+
+TASK_STATE_TRANSITION_MAP = {
+    states.RUNNING: {
+        'ANY': TASK_LAUNCHED,
+        'IDLE': TASK_RESUMED,
+        'PAUSED': TASK_RESUMED,
+        'WAITING': TASK_RESUMED
+    },
+    states.SUCCESS: {'ANY': TASK_SUCCEEDED},
+    states.ERROR: {'ANY': TASK_FAILED},
+    states.CANCELLED: {'ANY': TASK_CANCELLED},
+    states.PAUSED: {'ANY': TASK_PAUSED}
+}
+
+
+def identify_task_event(old_task_state, new_task_state):
+    event_options = (
+        TASK_STATE_TRANSITION_MAP[new_task_state]
+        if new_task_state in TASK_STATE_TRANSITION_MAP
+        else {}
+    )
+
+    if not event_options:
+        return None
+
+    event = (
+        event_options[old_task_state]
+        if old_task_state and old_task_state in event_options
+        else event_options['ANY']
+    )
+
+    return event

mistral/notifiers/notification_server.py

@@ -0,0 +1,93 @@
+# Copyright 2018 - Extreme Networks, 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 oslo_log import log as logging
+
+from mistral import config as cfg
+from mistral.notifiers import default_notifier as notif
+from mistral.rpc import base as rpc
+from mistral.service import base as service_base
+from mistral import utils
+from mistral.utils import profiler as profiler_utils
+
+LOG = logging.getLogger(__name__)
+
+
+class NotificationServer(service_base.MistralService):
+
+    def __init__(self, notifier, setup_profiler=True):
+        super(NotificationServer, self).__init__(
+            'notifier_group',
+            setup_profiler
+        )
+
+        self.notifier = notifier
+        self._rpc_server = None
+
+    def start(self):
+        super(NotificationServer, self).start()
+
+        if self._setup_profiler:
+            profiler_utils.setup('mistral-notifier', cfg.CONF.notifier.host)
+
+        # Initialize and start RPC server.
+
+        self._rpc_server = rpc.get_rpc_server_driver()(cfg.CONF.notifier)
+        self._rpc_server.register_endpoint(self)
+
+        self._rpc_server.run(executor='threading')
+
+        self._notify_started('Notification server started.')
+
+    def stop(self, graceful=False):
+        super(NotificationServer, self).stop(graceful)
+
+        if self._rpc_server:
+            self._rpc_server.stop(graceful)
+
+    def notify(self, rpc_ctx, ex_id, data, event, timestamp, publishers):
+        """Receives calls over RPC to notify on notification server.
+
+        :param rpc_ctx: RPC request context dictionary.
+        :param ex_id: Workflow, task, or action execution id.
+        :param data: Dictionary to include in the notification message.
+        :param event: Event being notified on.
+        :param timestamp: Datetime when this event occurred.
+        :param publishers: The list of publishers to send the notification.
+        """
+
+        LOG.info(
+            "Received RPC request 'notify'[ex_id=%s, event=%s, "
+            "timestamp=%s, data=%s, publishers=%s]",
+            ex_id,
+            event,
+            timestamp,
+            data,
+            utils.cut(publishers)
+        )
+
+        self.notifier.notify(
+            ex_id,
+            data,
+            event,
+            timestamp,
+            publishers
+        )
+
+
+def get_oslo_service(setup_profiler=True):
+    return NotificationServer(
+        notif.DefaultNotifier(),
+        setup_profiler=setup_profiler
+    )

mistral/notifiers/publishers/noop.py

@@ -0,0 +1,31 @@
+# Copyright 2018 - Extreme Networks, 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 oslo_log import log as logging
+
+from mistral.notifiers import base
+
+
+LOG = logging.getLogger(__name__)
+
+
+class NoopPublisher(base.NotificationPublisher):
+
+    def publish(self, ex_id, data, event, timestamp, **kwargs):
+        LOG.info(
+            'The event %s for %s is published by the '
+            'noop notification publisher.',
+            event,
+            ex_id
+        )

mistral/notifiers/publishers/webhook.py

@@ -0,0 +1,36 @@
+# Copyright 2018 - Extreme Networks, 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 json
+import requests
+from six.moves import http_client
+
+from oslo_log import log as logging
+
+from mistral.notifiers import base
+
+
+LOG = logging.getLogger(__name__)
+
+
+class WebhookPublisher(base.NotificationPublisher):
+
+    def publish(self, ex_id, data, event, timestamp, **kwargs):
+        url = kwargs.get('url')
+        headers = kwargs.get('headers', {})
+
+        resp = requests.post(url, data=json.dumps(data), headers=headers)
+
+        if resp.status_code not in [http_client.OK, http_client.CREATED]:
+            raise Exception(resp.text)

mistral/notifiers/remote_notifier.py

@@ -0,0 +1,30 @@
+# Copyright 2018 - Extreme Networks, 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 oslo_config import cfg
+from oslo_log import log as logging
+
+from mistral.rpc import base as rpc_base
+from mistral.rpc import clients as rpc_clients
+
+
+LOG = logging.getLogger(__name__)
+
+
+class RemoteNotifier(rpc_clients.NotifierClient):
+    """Notifier that passes notification request to a remote notifier."""
+
+    def __init__(self):
+        self.topic = cfg.CONF.notifier.topic
+        self._client = rpc_base.get_rpc_client_driver()(cfg.CONF.notifier)

mistral/rpc/clients.py

@@ -1,6 +1,7 @@
 # Copyright 2014 - Mirantis, Inc.
 # Copyright 2015 - StackStorm, Inc.
 # Copyright 2017 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -15,6 +16,7 @@
 #    limitations under the License.
 
 from oslo_config import cfg
+from oslo_log import log as logging
 from osprofiler import profiler
 import threading
 
@@ -22,9 +24,12 @@ from mistral import context as auth_ctx
 from mistral.engine import base as eng
 from mistral.event_engine import base as evt_eng
 from mistral.executors import base as exe
+from mistral.notifiers import base as notif
 from mistral.rpc import base
 
 
+LOG = logging.getLogger(__name__)
+
 _ENGINE_CLIENT = None
 _ENGINE_CLIENT_LOCK = threading.Lock()
 
@@ -34,6 +39,9 @@ _EXECUTOR_CLIENT_LOCK = threading.Lock()
 _EVENT_ENGINE_CLIENT = None
 _EVENT_ENGINE_CLIENT_LOCK = threading.Lock()
 
+_NOTIFIER_CLIENT = None
+_NOTIFIER_CLIENT_LOCK = threading.Lock()
+
 
 def cleanup():
     """Clean all the RPC clients.
@@ -46,15 +54,17 @@ def cleanup():
     global _ENGINE_CLIENT
     global _EXECUTOR_CLIENT
     global _EVENT_ENGINE_CLIENT
+    global _NOTIFIER_CLIENT
 
     _ENGINE_CLIENT = None
     _EXECUTOR_CLIENT = None
     _EVENT_ENGINE_CLIENT = None
+    _NOTIFIER_CLIENT = None
 
 
 def get_engine_client():
     global _ENGINE_CLIENT
-    global _EVENT_ENGINE_CLIENT_LOCK
+    global _ENGINE_CLIENT_LOCK
 
     with _ENGINE_CLIENT_LOCK:
         if not _ENGINE_CLIENT:
@@ -85,6 +95,17 @@ def get_event_engine_client():
     return _EVENT_ENGINE_CLIENT
 
 
+def get_notifier_client():
+    global _NOTIFIER_CLIENT
+    global _NOTIFIER_CLIENT_LOCK
+
+    with _NOTIFIER_CLIENT_LOCK:
+        if not _NOTIFIER_CLIENT:
+            _NOTIFIER_CLIENT = NotifierClient(cfg.CONF.notifier)
+
+    return _NOTIFIER_CLIENT
+
+
 class EngineClient(eng.Engine):
     """RPC Engine client."""
 
@@ -379,3 +400,25 @@ class EventEngineClient(evt_eng.EventEngine):
             'update_event_trigger',
             trigger=trigger,
         )
+
+
+class NotifierClient(notif.Notifier):
+    """RPC Notifier client."""
+
+    def __init__(self, rpc_conf_dict):
+        """Constructs an RPC client for the Notifier service."""
+        self._client = base.get_rpc_client_driver()(rpc_conf_dict)
+
+    def notify(self, ex_id, data, event, timestamp, publishers):
+        try:
+            return self._client.async_call(
+                auth_ctx.ctx(),
+                'notify',
+                ex_id=ex_id,
+                data=data,
+                event=event,
+                timestamp=timestamp,
+                publishers=publishers
+            )
+        except Exception:
+            LOG.exception('Unable to send notification.')

mistral/tests/unit/api/v2/test_executions.py

@@ -2,6 +2,7 @@
 # Copyright 2015 - StackStorm, Inc.
 # Copyright 2015 Huawei Technologies Co., Ltd.
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -505,13 +506,15 @@ class TestExecutionsController(base.APITest):
 
         load_wf_ex_func.assert_not_called()
 
+        kwargs = json.loads(expected_json['params'])
+        kwargs['description'] = expected_json['description']
+
         start_wf_func.assert_called_once_with(
             expected_json['workflow_id'],
             '',
             None,
             json.loads(expected_json['input']),
-            expected_json['description'],
-            **json.loads(expected_json['params'])
+            **kwargs
         )
 
     @mock.patch.object(rpc_clients.EngineClient, 'start_workflow')
@@ -540,13 +543,15 @@ class TestExecutionsController(base.APITest):
 
         load_wf_ex_func.assert_called_once_with(expected_json['id'])
 
+        kwargs = json.loads(expected_json['params'])
+        kwargs['description'] = expected_json['description']
+
         start_wf_func.assert_called_once_with(
             expected_json['workflow_id'],
             '',
             expected_json['id'],
             json.loads(expected_json['input']),
-            expected_json['description'],
-            **json.loads(expected_json['params'])
+            **kwargs
         )
 
     @mock.patch.object(rpc_clients.EngineClient, 'start_workflow')
@@ -600,7 +605,7 @@ class TestExecutionsController(base.APITest):
             '',
             exec_dict['id'],
             json.loads(exec_dict['input']),
-            exec_dict['description'],
+            description=exec_dict['description'],
             **json.loads(exec_dict['params'])
         )
 
@@ -629,7 +634,7 @@ class TestExecutionsController(base.APITest):
             '',
             '',
             json.loads(exec_dict['input']),
-            exec_dict['description'],
+            description=exec_dict['description'],
             **json.loads(exec_dict['params'])
         )
 
@@ -659,7 +664,7 @@ class TestExecutionsController(base.APITest):
             '',
             exec_dict['id'],
             json.loads(exec_dict['input']),
-            exec_dict['description'],
+            description=exec_dict['description'],
             **json.loads(exec_dict['params'])
         )
 

mistral/tests/unit/engine/base.py

@@ -1,6 +1,7 @@
 # Copyright 2014 - Mirantis, Inc.
 # Copyright 2015 - StackStorm, Inc.
 # Copyright 2016 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -24,6 +25,7 @@ from mistral.db.v2 import api as db_api
 from mistral.engine import engine_server
 from mistral.executors import base as exe
 from mistral.executors import executor_server
+from mistral.notifiers import notification_server as notif_server
 from mistral.rpc import base as rpc_base
 from mistral.rpc import clients as rpc_clients
 from mistral.tests.unit import base
@@ -76,6 +78,18 @@ class EngineTestCase(base.DbTestCase):
             self.threads.append(eventlet.spawn(launch_service, exe_svc))
             self.addCleanup(exe_svc.stop, True)
 
+        # Start remote notifier.
+        if cfg.CONF.notifier.type == 'remote':
+            LOG.info("Starting remote notifier threads...")
+
+            self.notifier_client = rpc_clients.get_notifier_client()
+
+            notif_svc = notif_server.get_oslo_service(setup_profiler=False)
+
+            self.notifier = notif_svc.notifier
+            self.threads.append(eventlet.spawn(launch_service, notif_svc))
+            self.addCleanup(notif_svc.stop, True)
+
         # Start engine.
         LOG.info("Starting engine threads...")
 
@@ -95,6 +109,9 @@ class EngineTestCase(base.DbTestCase):
         if cfg.CONF.executor.type == 'remote':
             exe_svc.wait_started()
 
+        if cfg.CONF.notifier.type == 'remote':
+            notif_svc.wait_started()
+
         eng_svc.wait_started()
 
     def kill_threads(self):

mistral/tests/unit/executors/test_server_plugins.py

@@ -1,4 +1,5 @@
 # Copyright 2017 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -13,10 +14,11 @@
 #    limitations under the License.
 
 from oslo_log import log as logging
+from stevedore import exception as sd_exc
 
 from mistral.executors import base as exe
-from mistral.executors import default_executor as d_exe
-from mistral.executors import remote_executor as r_exe
+from mistral.executors import default_executor as d
+from mistral.executors import remote_executor as r
 from mistral.tests.unit.executors import base
 
 
@@ -32,9 +34,12 @@ class PluginTestCase(base.ExecutorTestCase):
     def test_get_local_executor(self):
         executor = exe.get_executor('local')
 
-        self.assertIsInstance(executor, d_exe.DefaultExecutor)
+        self.assertIsInstance(executor, d.DefaultExecutor)
 
     def test_get_remote_executor(self):
         executor = exe.get_executor('remote')
 
-        self.assertIsInstance(executor, r_exe.RemoteExecutor)
+        self.assertIsInstance(executor, r.RemoteExecutor)
+
+    def test_get_bad_executor(self):
+        self.assertRaises(sd_exc.NoMatches, exe.get_executor, 'foobar')

mistral/tests/unit/notifiers/base.py

@@ -0,0 +1,47 @@
+# Copyright 2018 - Extreme Networks, 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 oslo_log import log as logging
+
+from mistral.tests.unit.engine import base as engine_test_base
+
+
+LOG = logging.getLogger(__name__)
+
+
+class NotifierTestCase(engine_test_base.EngineTestCase):
+
+    def await_workflow_success(self, wf_ex_id, post_delay=1):
+        # Override the original wait method to add a delay to allow enough
+        # time for the notification events to get processed.
+        super(NotifierTestCase, self).await_workflow_success(wf_ex_id)
+        self._sleep(post_delay)
+
+    def await_workflow_error(self, wf_ex_id, post_delay=1):
+        # Override the original wait method to add a delay to allow enough
+        # time for the notification events to get processed.
+        super(NotifierTestCase, self).await_workflow_error(wf_ex_id)
+        self._sleep(post_delay)
+
+    def await_workflow_paused(self, wf_ex_id, post_delay=1):
+        # Override the original wait method to add a delay to allow enough
+        # time for the notification events to get processed.
+        super(NotifierTestCase, self).await_workflow_paused(wf_ex_id)
+        self._sleep(post_delay)
+
+    def await_workflow_cancelled(self, wf_ex_id, post_delay=1):
+        # Override the original wait method to add a delay to allow enough
+        # time for the notification events to get processed.
+        super(NotifierTestCase, self).await_workflow_cancelled(wf_ex_id)
+        self._sleep(post_delay)

mistral/tests/unit/notifiers/test_notifier_servers.py

@@ -0,0 +1,221 @@
+# Copyright 2018 - Extreme Networks, 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 mock
+
+from oslo_config import cfg
+from stevedore import exception as sd_exc
+
+from mistral.db.v2 import api as db_api
+from mistral.notifiers import base as notif
+from mistral.notifiers import default_notifier as d_notif
+from mistral.notifiers import notification_events as events
+from mistral.notifiers import remote_notifier as r_notif
+from mistral.services import workflows as wf_svc
+from mistral.tests.unit.notifiers import base
+from mistral.workflow import states
+
+# Use the set_default method to set value otherwise in certain test cases
+# the change in value is not permanent.
+cfg.CONF.set_default('auth_enable', False, group='pecan')
+
+EVENT_LOGS = []
+
+
+def publisher_process(ex_id, data, event, timestamp, **kwargs):
+    EVENT_LOGS.append((ex_id, event))
+
+
+def notifier_process(ex_id, data, event, timestamp, publishers):
+    EVENT_LOGS.append((ex_id, event))
+
+
+class ServerPluginTestCase(base.NotifierTestCase):
+
+    def tearDown(self):
+        notif.cleanup()
+        super(ServerPluginTestCase, self).tearDown()
+
+    def test_get_bad_notifier(self):
+        self.assertRaises(sd_exc.NoMatches, notif.get_notifier, 'foobar')
+
+
+@mock.patch.object(
+    r_notif.RemoteNotifier,
+    'notify',
+    mock.MagicMock(return_value=None)
+)
+class LocalNotifServerTestCase(base.NotifierTestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super(LocalNotifServerTestCase, cls).setUpClass()
+        cfg.CONF.set_default('type', 'local', group='notifier')
+
+    @classmethod
+    def tearDownClass(cls):
+        cfg.CONF.set_default('type', 'remote', group='notifier')
+        super(LocalNotifServerTestCase, cls).tearDownClass()
+
+    def setUp(self):
+        super(LocalNotifServerTestCase, self).setUp()
+        self.publisher = notif.get_notification_publisher('webhook')
+        self.publisher.publish = mock.MagicMock(side_effect=publisher_process)
+        self.publisher.publish.reset_mock()
+        del EVENT_LOGS[:]
+
+    def tearDown(self):
+        notif.cleanup()
+        super(LocalNotifServerTestCase, self).tearDown()
+
+    def test_get_notifier(self):
+        notifier = notif.get_notifier(cfg.CONF.notifier.type)
+
+        self.assertEqual('local', cfg.CONF.notifier.type)
+        self.assertIsInstance(notifier, d_notif.DefaultNotifier)
+
+    def test_notify(self):
+        wf_def = """
+        version: '2.0'
+        wf:
+          tasks:
+            t1:
+              action: std.noop
+              on-success:
+                - t2
+            t2:
+              action: std.noop
+        """
+
+        wf_svc.create_workflows(wf_def)
+
+        notif_options = [{'type': 'webhook'}]
+
+        wf_ex = self.engine.start_workflow(
+            'wf',
+            '',
+            wf_input={},
+            notify=notif_options
+        )
+
+        self.await_workflow_success(wf_ex.id)
+
+        with db_api.transaction():
+            wf_ex = db_api.get_workflow_execution(wf_ex.id)
+            task_exs = wf_ex.task_executions
+
+        self.assertEqual(states.SUCCESS, wf_ex.state)
+        self.assertIsNone(wf_ex.state_info)
+        self.assertEqual(2, len(task_exs))
+
+        t1_ex = self._assert_single_item(task_exs, name='t1')
+        t2_ex = self._assert_single_item(task_exs, name='t2')
+
+        self.assertEqual(states.SUCCESS, t1_ex.state)
+        self.assertIsNone(t1_ex.state_info)
+        self.assertEqual(states.SUCCESS, t2_ex.state)
+        self.assertIsNone(t2_ex.state_info)
+
+        expected_order = [
+            (wf_ex.id, events.WORKFLOW_LAUNCHED),
+            (t1_ex.id, events.TASK_LAUNCHED),
+            (t1_ex.id, events.TASK_SUCCEEDED),
+            (t2_ex.id, events.TASK_LAUNCHED),
+            (t2_ex.id, events.TASK_SUCCEEDED),
+            (wf_ex.id, events.WORKFLOW_SUCCEEDED)
+        ]
+
+        self.assertFalse(r_notif.RemoteNotifier.notify.called)
+        self.assertListEqual(expected_order, EVENT_LOGS)
+
+
+@mock.patch.object(
+    r_notif.RemoteNotifier,
+    'notify',
+    mock.MagicMock(side_effect=notifier_process)
+)
+class RemoteNotifServerTestCase(base.NotifierTestCase):
+
+    @classmethod
+    def setUpClass(cls):
+        super(RemoteNotifServerTestCase, cls).setUpClass()
+        cfg.CONF.set_default('type', 'remote', group='notifier')
+
+    def setUp(self):
+        super(RemoteNotifServerTestCase, self).setUp()
+        del EVENT_LOGS[:]
+
+    def tearDown(self):
+        notif.cleanup()
+        super(RemoteNotifServerTestCase, self).tearDown()
+
+    def test_get_notifier(self):
+        notifier = notif.get_notifier(cfg.CONF.notifier.type)
+
+        self.assertEqual('remote', cfg.CONF.notifier.type)
+        self.assertIsInstance(notifier, r_notif.RemoteNotifier)
+
+    def test_notify(self):
+        wf_def = """
+        version: '2.0'
+        wf:
+          tasks:
+            t1:
+              action: std.noop
+              on-success:
+                - t2
+            t2:
+              action: std.noop
+        """
+
+        wf_svc.create_workflows(wf_def)
+
+        notif_options = [{'type': 'foobar'}]
+
+        wf_ex = self.engine.start_workflow(
+            'wf',
+            '',
+            wf_input={},
+            notify=notif_options
+        )
+
+        self.await_workflow_success(wf_ex.id)
+
+        with db_api.transaction():
+            wf_ex = db_api.get_workflow_execution(wf_ex.id)
+            task_exs = wf_ex.task_executions
+
+        self.assertEqual(states.SUCCESS, wf_ex.state)
+        self.assertIsNone(wf_ex.state_info)
+        self.assertEqual(2, len(task_exs))
+
+        t1_ex = self._assert_single_item(task_exs, name='t1')
+        t2_ex = self._assert_single_item(task_exs, name='t2')
+
+        self.assertEqual(states.SUCCESS, t1_ex.state)
+        self.assertIsNone(t1_ex.state_info)
+        self.assertEqual(states.SUCCESS, t2_ex.state)
+        self.assertIsNone(t2_ex.state_info)
+
+        expected_order = [
+            (wf_ex.id, events.WORKFLOW_LAUNCHED),
+            (t1_ex.id, events.TASK_LAUNCHED),
+            (t1_ex.id, events.TASK_SUCCEEDED),
+            (t2_ex.id, events.TASK_LAUNCHED),
+            (t2_ex.id, events.TASK_SUCCEEDED),
+            (wf_ex.id, events.WORKFLOW_SUCCEEDED)
+        ]
+
+        self.assertTrue(r_notif.RemoteNotifier.notify.called)
+        self.assertListEqual(expected_order, EVENT_LOGS)

mistral/tests/unit/test_launcher.py

@@ -1,4 +1,5 @@
 # Copyright 2017 - Brocade Communications Systems, Inc.
+# Copyright 2018 - Extreme Networks, Inc.
 #
 #    Licensed under the Apache License, Version 2.0 (the "License");
 #    you may not use this file except in compliance with the License.
@@ -47,7 +48,7 @@ class ServiceLauncherTest(base.DbTestCase):
         api_workers = api_server.workers
 
         self._await(lambda: len(svr_proc_mgr.children.keys()) == api_workers)
-        self._await(lambda: len(svr_thrd_mgr.services.services) == 3)
+        self._await(lambda: len(svr_thrd_mgr.services.services) == 4)
 
     def test_launch_process(self):
         eventlet.spawn(launch.launch_any, ['api'])

setup.cfg

@@ -75,6 +75,14 @@ mistral.executors =
     local = mistral.executors.default_executor:DefaultExecutor
     remote = mistral.executors.remote_executor:RemoteExecutor
 
+mistral.notifiers =
+    local = mistral.notifiers.default_notifier:DefaultNotifier
+    remote = mistral.notifiers.remote_notifier:RemoteNotifier
+
+mistral.notification.publishers =
+    webhook = mistral.notifiers.publishers.webhook:WebhookPublisher
+    noop = mistral.notifiers.publishers.noop:NoopPublisher
+
 mistral.expression.functions =
     # json_pp was deprecated in Queens and will be removed in the S cycle
     json_pp = mistral.utils.expression_utils:json_pp_