Add engine related features

* Workflow in scalable engine
  * find tasks to run
  * find workflow tasks
 * Added unit tests
 * Fix events test

Change-Id: Ib3a97f976b101a68cbbde9d2117f5b2ca5eab5cd

mistral/dsl.py

@@ -31,8 +31,14 @@ class Parser(object):
             raise RuntimeError("Definition could not be parsed: %s\n"
                                % exc.message)
 
-    def get_service(self):
-        return self.doc["Service"]
+    def get_services(self):
+        services = []
+        for service_name in self.doc["Services"]:
+            services.append(self.doc["Services"][service_name])
+        return services
+
+    def get_service(self, service_name):
+        return self.doc["Services"][service_name]
 
     def get_events(self):
         events_from_doc = self.doc["Workflow"]["events"]
@@ -46,12 +52,20 @@ class Parser(object):
     def get_tasks(self):
         return self.doc["Workflow"]["tasks"]
 
-    def get_action(self, action_name):
-        # TODO(rakhmerov): it needs to return action definition as a dict
-        pass
+    def get_action(self, task_action_name):
+        service_name = task_action_name.split(':')[0]
+        action_name = task_action_name.split(':')[1]
+        action = self.get_service(service_name)['actions'][action_name]
+        return action
 
-    def get_service_name(self):
-        return self.doc['Service']['name']
+    def get_actions(self, service_name):
+        return self.get_service(service_name)['actions']
+
+    def get_service_names(self):
+        names = []
+        for name in self.doc['Services']:
+            names.append(name)
+        return names
 
     def get_event_task_name(self, event_name):
         return self.doc["Workflow"]["events"][event_name]['tasks']

mistral/engine/scalable/workflow.py

@@ -14,18 +14,72 @@
 #    See the License for the specific language governing permissions and
 #    limitations under the License.
 
+import networkx as nx
+from networkx.algorithms import traversal
+
+from mistral.engine import states
+
 
 def find_workflow_tasks(wb_dsl, target_task_name):
-    # TODO(rakhmerov): implement using networkX
-    return None
-
-
-def find_tasks_to_start(tasks):
-    # TODO(rakhmerov): implement using networkX
-    # We need to analyse graph and see which tasks are ready to start
+    dsl_tasks = wb_dsl.get_tasks()
+    full_graph = nx.DiGraph()
+    for t in dsl_tasks:
+        full_graph.add_node(t)
+    _update_dependencies(dsl_tasks, full_graph)
+    graph = _get_subgraph(full_graph, target_task_name)
+    tasks = []
+    for node in graph:
+        task = {'name': node}
+        task.update(dsl_tasks[node])
+        tasks.append(task)
     return tasks
 
 
+def find_tasks_to_start(tasks):
+    # We need to analyse graph and see which tasks are ready to start
+    return _get_resolved_tasks(tasks)
+
+
 def is_finished(tasks):
-    # TODO(rakhmerov): implement
-    return False
+    for task in tasks:
+        if not states.is_finished(task['state']):
+            return False
+    return True
+
+
+def _get_subgraph(full_graph, task_name):
+        nodes_set = traversal.dfs_predecessors(full_graph.reverse(),
+                                               task_name).keys()
+        nodes_set.append(task_name)
+        return full_graph.subgraph(nodes_set)
+
+
+def _get_dependency_tasks(tasks, task):
+        if 'dependsOn' not in tasks[task]:
+            return []
+        deps = set()
+        for t in tasks:
+            for dep in tasks[task]['dependsOn']:
+                if dep == t:
+                    deps.add(t)
+        return deps
+
+
+def _update_dependencies(tasks, graph):
+    for task in tasks:
+        for dep in _get_dependency_tasks(tasks, task):
+            graph.add_edge(dep, task)
+
+
+def _get_resolved_tasks(tasks):
+        resolved_tasks = []
+        allows = []
+        for t in tasks:
+            if t['state'] == states.SUCCESS:
+                allows += t['dependencies']
+        allow_set = set(allows)
+        for t in tasks:
+            if len(allow_set - set(t['dependencies'])) == 0:
+                if t['state'] == states.IDLE:
+                    resolved_tasks.append(t)
+        return resolved_tasks

mistral/tests/resources/test_rest.yaml

@@ -1,43 +1,43 @@
-Service:
-   name: MyRest
-   type: REST_API
-   parameters:
-       baseUrl: http://some_host
-   actions:
-       create-vm:
-         parameters:
-             url: /service/action/execute
-             method: GET
-         task-parameters:
-            flavor_id:
-              optional: false
-            image_id:
-              optional: false
-       backup-vm:
-         parameters:
-             url: url_for_backup
-             method: GET
-         task-parameters:
-             server_id:
-               optional: false
-       attach-volume:
-         parameters:
-             url: url_for_attach
-             method: GET
-         task-parameters:
-             size:
-               optional: false
-             mnt_path:
-               optional: false
-       format-volume:
-         parameters:
-             url: url_for_format
-             method: GET
-         task-parameters:
-             volume_id:
-               optional: false
-             server_id:
-               optional: false
+Services:
+   MyRest:
+     type: REST_API
+     parameters:
+         baseUrl: http://some_host
+     actions:
+         create-vm:
+           parameters:
+               url: /service/action/execute
+               method: GET
+           task-parameters:
+              flavor_id:
+                optional: false
+              image_id:
+                optional: false
+         backup-vm:
+           parameters:
+               url: url_for_backup
+               method: GET
+           task-parameters:
+               server_id:
+                 optional: false
+         attach-volume:
+           parameters:
+               url: url_for_attach
+               method: GET
+           task-parameters:
+               size:
+                 optional: false
+               mnt_path:
+                 optional: false
+         format-volume:
+           parameters:
+               url: url_for_format
+               method: GET
+           task-parameters:
+               volume_id:
+                 optional: false
+               server_id:
+                 optional: false
 
 
 Workflow:

mistral/tests/unit/db/test_events.py

@@ -24,7 +24,8 @@ SAMPLE_EVENT = {
     "id": "123",
     "name": "test_event",
     "pattern": "* *",
-    "next_execution_time": timeutils.utcnow()
+    "next_execution_time": timeutils.utcnow(),
+    'workbook_name': 'wb_name'
 }
 
 

mistral/tests/unit/engine/scalable/test_workflow.py

@@ -0,0 +1,57 @@
+# -*- 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.
+import pkg_resources as pkg
+
+from mistral import dsl
+from mistral import version
+from mistral.tests.unit import base
+from mistral.engine import states
+from mistral.engine.scalable import workflow
+
+TASKS = [
+    {
+        'dependencies': [],
+        'name': 'backup-vms',
+        'state': states.IDLE
+    },
+    {
+        'dependencies': [],
+        'name': 'create-vms',
+        'state': states.RUNNING
+    },
+    {
+        'dependencies': ['create-vms'],
+        'name': 'attach-volume',
+        'state': states.IDLE
+    }
+]
+
+
+class WorkflowTest(base.DbTestCase):
+    def setUp(self):
+        super(WorkflowTest, self).setUp()
+        self.doc = open(pkg.resource_filename(
+            version.version_info.package,
+            "tests/resources/test_rest.yaml")).read()
+        self.parser = dsl.Parser(self.doc)
+
+    def test_find_workflow_tasks(self):
+        tasks = workflow.find_workflow_tasks(self.parser, "attach-volumes")
+        self.assertEqual(tasks[1]['name'], 'create-vms')
+
+    def test_tasks_to_start(self):
+        tasks_to_start = workflow.find_tasks_to_start(TASKS)
+        self.assertEqual(len(tasks_to_start), 2)

mistral/tests/unit/test_parser.py

@@ -27,11 +27,14 @@ class DSLParserTest(unittest2.TestCase):
             "tests/resources/test_rest.yaml")).read()
         self.dsl = dsl.Parser(doc)
 
-    def test_service(self):
-        service = self.dsl.get_service()
-        self.assertEqual(service["name"], "MyRest")
+    def test_services(self):
+        service = self.dsl.get_service("MyRest")
         self.assertEqual(service["type"], "REST_API")
         self.assertIn("baseUrl", service["parameters"])
+        services = self.dsl.get_services()
+        self.assertEqual(len(services), 1)
+        service_names = self.dsl.get_service_names()
+        self.assertEqual(service_names[0], "MyRest")
 
     def test_events(self):
         events = self.dsl.get_events()
@@ -44,6 +47,12 @@ class DSLParserTest(unittest2.TestCase):
         self.assertEqual(tasks["backup-vms"]["action"],
                          "Nova:backup-vm")
 
+    def test_actions(self):
+        action = self.dsl.get_action("MyRest:attach-volume")
+        self.assertIn("method", action["parameters"])
+        actions = self.dsl.get_actions("MyRest")
+        self.assertIn("task-parameters", actions["attach-volume"])
+
     def test_broken_definition(self):
         broken_yaml = """
         Workflow: