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from mock import Mock
from twisted.internet import defer
from synapse.storage.background_updates import BackgroundUpdater
from tests import unittest
class BackgroundUpdateTestCase(unittest.HomeserverTestCase):
def prepare(self, reactor, clock, homeserver):
self.updates = (
self.hs.get_datastore().db_pool.updates
) # type: BackgroundUpdater
# the base test class should have run the real bg updates for us
self.assertTrue(
self.get_success(self.updates.has_completed_background_updates())
)
self.update_handler = Mock()
self.updates.register_background_update_handler(
"test_update", self.update_handler
)
def test_do_background_update(self):
# the time we claim each update takes
duration_ms = 42
# the target runtime for each bg update
target_background_update_duration_ms = 50000
store = self.hs.get_datastore()
self.get_success(
store.db_pool.simple_insert(
"background_updates",
values={"update_name": "test_update", "progress_json": '{"my_key": 1}'},
)
)
# first step: make a bit of progress
@defer.inlineCallbacks
def update(progress, count):
yield self.clock.sleep((count * duration_ms) / 1000)
progress = {"my_key": progress["my_key"] + 1}
yield store.db_pool.runInteraction(
"update_progress",
self.updates._background_update_progress_txn,
"test_update",
progress,
)
return count
self.update_handler.side_effect = update
self.update_handler.reset_mock()
res = self.get_success(
self.updates.do_next_background_update(
target_background_update_duration_ms
),
by=0.1,
)
self.assertFalse(res)
# on the first call, we should get run with the default background update size
self.update_handler.assert_called_once_with(
{"my_key": 1}, self.updates.DEFAULT_BACKGROUND_BATCH_SIZE
)
# second step: complete the update
# we should now get run with a much bigger number of items to update
async def update(progress, count):
self.assertEqual(progress, {"my_key": 2})
self.assertAlmostEqual(
count, target_background_update_duration_ms / duration_ms, places=0,
)
await self.updates._end_background_update("test_update")
return count
self.update_handler.side_effect = update
self.update_handler.reset_mock()
result = self.get_success(
self.updates.do_next_background_update(target_background_update_duration_ms)
)
self.assertFalse(result)
self.update_handler.assert_called_once()
# third step: we don't expect to be called any more
self.update_handler.reset_mock()
result = self.get_success(
self.updates.do_next_background_update(target_background_update_duration_ms)
)
self.assertTrue(result)
self.assertFalse(self.update_handler.called)
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