Implement task cli list method

This method shows list of all tasks and their details

Change-Id: I991950823ac5e6cc5057e4e3563bd4084654a36a

rally/cmd/main.py

@@ -22,6 +22,8 @@ from __future__ import print_function
 import json
 import sys
 
+import prettytable
+
 from rally.cmd import cliutils
 from rally import db
 from rally.openstack.common.gettextutils import _   # noqa
@@ -64,7 +66,15 @@ class TaskCommands(object):
         """Get list of all tasks
         Returns list of active tasks
         """
-        print(_("Not implemented"))
+
+        headers = ['uuid', 'created_at', 'status', 'failed']
+        table = prettytable.PrettyTable(headers)
+
+        for t in db.task_list():
+            r = [t['uuid'], str(t['created_at']), t['status'], t['failed']]
+            table.add_row(r)
+
+        print(table)
 
 
 def main():

requirements.txt

@@ -5,6 +5,7 @@ jsonschema>=2.0.0
 netaddr>=0.7.6
 paramiko>=1.8.0
 pbr>=0.5.21,<1.0
+PrettyTable>=0.6,<0.8
 psutil
 pytest
 pytest-timeout

tests/cmd/test_main.py

@@ -55,4 +55,10 @@ class TaskCommandsTestCase(test.BaseTestCase):
             mock_db.task_get_by_uuid.assert_called_once_with(test_uuid)
 
     def test_list(self):
-        self.task.list()
+        db_response = [
+            {'uuid': 'a', 'created_at': 'b', 'status': 'c', 'failed': True}
+        ]
+        with mock.patch("rally.cmd.main.db") as mock_db:
+            mock_db.task_list = mock.MagicMock(return_value=db_response)
+            self.task.list()
+            mock_db.task_list.assert_called_once_with()