Produce activities for task changes.

These activities do not show any details yet, so the activity stream can't
show _what_ changed in the task, just that the task changed.

attract/tasks/eve_hooks.py

@@ -4,6 +4,8 @@ from flask import current_app
 
 from attract.node_types.task import node_type_task
 from pillar.api.nodes import only_for_node_type_decorator
+import pillar.api.activities
+import pillar.api.utils.authentication
 
 log = logging.getLogger(__name__)
 only_for_task = only_for_node_type_decorator(node_type_task['name'])
@@ -68,6 +70,56 @@ def fetch_tasks_parent_info(nodes):
         fetch_task_extra_info(node)
 
 
+# Activity logging
+@only_for_task
+def activity_after_replacing_task(task, original):
+    user_id = pillar.api.utils.authentication.current_user_id()
+    pillar.api.activities.register_activity(
+        user_id,
+        'edited task',
+        'node', task['_id'],
+        'project',
+        task['project'],
+        task['project'],
+    )
+
+
+@only_for_task
+def activity_after_creating_task(task):
+    user_id = pillar.api.utils.authentication.current_user_id()
+    pillar.api.activities.register_activity(
+        user_id,
+        'created a new task',
+        'node', task['_id'],
+        'project',
+        task['project'],
+        task['project'],
+    )
+
+
+def activity_after_creating_tasks(nodes):
+    for node in nodes:
+        activity_after_creating_task(node)
+
+
+@only_for_task
+def activity_after_deleting_task(task):
+    user_id = pillar.api.utils.authentication.current_user_id()
+    pillar.api.activities.register_activity(
+        user_id,
+        'deleted task',
+        'node', task['_id'],
+        'project',
+        task['project'],
+        task['project'],
+    )
+
+
 def setup_app(app):
     app.on_fetched_item_nodes += fetch_task_extra_info
     app.on_fetched_resource_nodes += fetch_tasks_parent_info
+
+    app.on_replaced_nodes += activity_after_replacing_task
+    app.on_inserted_nodes += activity_after_creating_tasks
+    app.on_deleted_item_nodes += activity_after_deleting_task
+    app.on_deleted_resource_nodes += activity_after_deleting_task