sdk/python/tests/test_websockets.py

   1 import arvados
   2 import arvados.events
   3 import arvados.errors
   4 from datetime import datetime, timedelta, tzinfo
   5 import logging
   6 import logging.handlers
   7 import mock
   8 import Queue
   9 import run_test_server
  10 import StringIO
  11 import tempfile
  12 import threading
  13 import time
  14 import unittest
  15
  16 class WebsocketTest(run_test_server.TestCaseWithServers):
  17     MAIN_SERVER = {}
  18
  19     TIME_PAST = time.time()-3600
  20     TIME_FUTURE = time.time()+3600
  21
  22     def setUp(self):
  23         self.ws = None
  24
  25     def tearDown(self):
  26         try:
  27             if self.ws:
  28                 self.ws.close()
  29         except Exception as e:
  30             print("Error in teardown: ", e)
  31         super(WebsocketTest, self).tearDown()
  32         run_test_server.reset()
  33
  34     def _test_subscribe(self, poll_fallback, expect_type, start_time=None, expected=1):
  35         run_test_server.authorize_with('active')
  36         events = Queue.Queue(100)
  37
  38         # Create ancestor before subscribing.
  39         # When listening with start_time in the past, this should also be retrieved.
  40         # However, when start_time is omitted in subscribe, this should not be fetched.
  41         ancestor = arvados.api('v1').humans().create(body={}).execute()
  42
  43         filters = [['object_uuid', 'is_a', 'arvados#human']]
  44         if start_time:
  45             filters.append(['created_at', '>=', start_time])
  46
  47         self.ws = arvados.events.subscribe(
  48             arvados.api('v1'), filters,
  49             events.put_nowait,
  50             poll_fallback=poll_fallback,
  51             last_log_id=(1 if start_time else None))
  52         self.assertIsInstance(self.ws, expect_type)
  53         self.assertEqual(200, events.get(True, 5)['status'])
  54         human = arvados.api('v1').humans().create(body={}).execute()
  55
  56         log_object_uuids = []
  57         for i in range(0, expected):
  58             log_object_uuids.append(events.get(True, 5)['object_uuid'])
  59
  60         if expected > 0:
  61             self.assertIn(human['uuid'], log_object_uuids)
  62
  63         if expected > 1:
  64             self.assertIn(ancestor['uuid'], log_object_uuids)
  65
  66         with self.assertRaises(Queue.Empty):
  67             # assertEqual just serves to show us what unexpected thing
  68             # comes out of the queue when the assertRaises fails; when
  69             # the test passes, this assertEqual doesn't get called.
  70             self.assertEqual(events.get(True, 2), None)
  71
  72     def test_subscribe_websocket(self):
  73         self._test_subscribe(
  74             poll_fallback=False, expect_type=arvados.events.EventClient, expected=1)
  75
  76     @mock.patch('arvados.events.EventClient.__init__')
  77     def test_subscribe_poll(self, event_client_constr):
  78         event_client_constr.side_effect = Exception('All is well')
  79         self._test_subscribe(
  80             poll_fallback=0.25, expect_type=arvados.events.PollClient, expected=1)
  81
  82     def test_subscribe_poll_retry(self):
  83         api_mock = mock.MagicMock()
  84         n = []
  85         def on_ev(ev):
  86             n.append(ev)
  87
  88         error_mock = mock.MagicMock()
  89         error_mock.resp.status = 0
  90         error_mock._get_reason.return_value = "testing"
  91         api_mock.logs().list().execute.side_effect = (arvados.errors.ApiError(error_mock, ""),
  92                                                       {"items": [{"id": 1}], "items_available": 1},
  93                                                       arvados.errors.ApiError(error_mock, ""),
  94                                                       {"items": [{"id": 1}], "items_available": 1})
  95         pc = arvados.events.PollClient(api_mock, [], on_ev, 15, None)
  96         pc.start()
  97         while len(n) < 2:
  98             time.sleep(.1)
  99         pc.close()
 100
 101     def test_subscribe_websocket_with_start_time_past(self):
 102         self._test_subscribe(
 103             poll_fallback=False, expect_type=arvados.events.EventClient,
 104             start_time=self.localiso(self.TIME_PAST),
 105             expected=2)
 106
 107     @mock.patch('arvados.events.EventClient.__init__')
 108     def test_subscribe_poll_with_start_time_past(self, event_client_constr):
 109         event_client_constr.side_effect = Exception('All is well')
 110         self._test_subscribe(
 111             poll_fallback=0.25, expect_type=arvados.events.PollClient,
 112             start_time=self.localiso(self.TIME_PAST),
 113             expected=2)
 114
 115     def test_subscribe_websocket_with_start_time_future(self):
 116         self._test_subscribe(
 117             poll_fallback=False, expect_type=arvados.events.EventClient,
 118             start_time=self.localiso(self.TIME_FUTURE),
 119             expected=0)
 120
 121     @mock.patch('arvados.events.EventClient.__init__')
 122     def test_subscribe_poll_with_start_time_future(self, event_client_constr):
 123         event_client_constr.side_effect = Exception('All is well')
 124         self._test_subscribe(
 125             poll_fallback=0.25, expect_type=arvados.events.PollClient,
 126             start_time=self.localiso(self.TIME_FUTURE),
 127             expected=0)
 128
 129     def test_subscribe_websocket_with_start_time_past_utc(self):
 130         self._test_subscribe(
 131             poll_fallback=False, expect_type=arvados.events.EventClient,
 132             start_time=self.utciso(self.TIME_PAST),
 133             expected=2)
 134
 135     def test_subscribe_websocket_with_start_time_future_utc(self):
 136         self._test_subscribe(
 137             poll_fallback=False, expect_type=arvados.events.EventClient,
 138             start_time=self.utciso(self.TIME_FUTURE),
 139             expected=0)
 140
 141     def utciso(self, t):
 142         return time.strftime('%Y-%m-%dT%H:%M:%SZ', time.gmtime(t))
 143
 144     def localiso(self, t):
 145         return time.strftime('%Y-%m-%dT%H:%M:%S', time.localtime(t)) + self.isotz(-time.timezone/60)
 146
 147     def isotz(self, offset):
 148         """Convert minutes-east-of-UTC to ISO8601 time zone designator"""
 149         return '{:+03d}{:02d}'.format(offset/60, offset%60)
 150
 151     # Test websocket reconnection on (un)execpted close
 152     def _test_websocket_reconnect(self, close_unexpected):
 153         run_test_server.authorize_with('active')
 154         events = Queue.Queue(100)
 155
 156         logstream = StringIO.StringIO()
 157         rootLogger = logging.getLogger()
 158         streamHandler = logging.StreamHandler(logstream)
 159         rootLogger.addHandler(streamHandler)
 160
 161         filters = [['object_uuid', 'is_a', 'arvados#human']]
 162         filters.append(['created_at', '>=', self.localiso(self.TIME_PAST)])
 163         self.ws = arvados.events.subscribe(
 164             arvados.api('v1'), filters,
 165             events.put_nowait,
 166             poll_fallback=False,
 167             last_log_id=None)
 168         self.assertIsInstance(self.ws, arvados.events.EventClient)
 169         self.assertEqual(200, events.get(True, 5)['status'])
 170
 171         # create obj
 172         human = arvados.api('v1').humans().create(body={}).execute()
 173
 174         # expect an event
 175         self.assertIn(human['uuid'], events.get(True, 5)['object_uuid'])
 176         with self.assertRaises(Queue.Empty):
 177             self.assertEqual(events.get(True, 2), None)
 178
 179         # close (im)properly
 180         if close_unexpected:
 181             self.ws.close_connection()
 182         else:
 183             self.ws.close()
 184
 185         # create one more obj
 186         human2 = arvados.api('v1').humans().create(body={}).execute()
 187
 188         # (un)expect the object creation event
 189         if close_unexpected:
 190             log_object_uuids = []
 191             for i in range(0, 2):
 192                 event = events.get(True, 5)
 193                 if event.get('object_uuid') != None:
 194                     log_object_uuids.append(event['object_uuid'])
 195             with self.assertRaises(Queue.Empty):
 196                 self.assertEqual(events.get(True, 2), None)
 197             self.assertNotIn(human['uuid'], log_object_uuids)
 198             self.assertIn(human2['uuid'], log_object_uuids)
 199         else:
 200             with self.assertRaises(Queue.Empty):
 201                 self.assertEqual(events.get(True, 2), None)
 202
 203         # verify log message to ensure that an (un)expected close
 204         log_messages = logstream.getvalue()
 205         closeLogFound = log_messages.find("Unexpected close. Reconnecting.")
 206         retryLogFound = log_messages.find("Error during websocket reconnect. Will retry")
 207         if close_unexpected:
 208             self.assertNotEqual(closeLogFound, -1)
 209         else:
 210             self.assertEqual(closeLogFound, -1)
 211         rootLogger.removeHandler(streamHandler)
 212
 213     def test_websocket_reconnect_on_unexpected_close(self):
 214         self._test_websocket_reconnect(True)
 215
 216     def test_websocket_no_reconnect_on_close_by_user(self):
 217         self._test_websocket_reconnect(False)
 218
 219     # Test websocket reconnection retry
 220     @mock.patch('arvados.events._EventClient.connect')
 221     def test_websocket_reconnect_retry(self, event_client_connect):
 222         event_client_connect.side_effect = [None, Exception('EventClient.connect error'), None]
 223
 224         logstream = StringIO.StringIO()
 225         rootLogger = logging.getLogger()
 226         streamHandler = logging.StreamHandler(logstream)
 227         rootLogger.addHandler(streamHandler)
 228
 229         run_test_server.authorize_with('active')
 230         events = Queue.Queue(100)
 231
 232         filters = [['object_uuid', 'is_a', 'arvados#human']]
 233         self.ws = arvados.events.subscribe(
 234             arvados.api('v1'), filters,
 235             events.put_nowait,
 236             poll_fallback=False,
 237             last_log_id=None)
 238         self.assertIsInstance(self.ws, arvados.events.EventClient)
 239
 240         # simulate improper close
 241         self.ws.on_closed()
 242
 243         # verify log messages to ensure retry happened
 244         log_messages = logstream.getvalue()
 245         found = log_messages.find("Error 'EventClient.connect error' during websocket reconnect.")
 246         self.assertNotEqual(found, -1)
 247         rootLogger.removeHandler(streamHandler)