/
test_leaser.py
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/
test_leaser.py
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# Copyright 2017, Google LLC
#
# 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
#
# https://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 logging
import threading
from google.cloud.pubsub_v1 import types
from google.cloud.pubsub_v1.subscriber._protocol import dispatcher
from google.cloud.pubsub_v1.subscriber._protocol import histogram
from google.cloud.pubsub_v1.subscriber._protocol import leaser
from google.cloud.pubsub_v1.subscriber._protocol import requests
from google.cloud.pubsub_v1.subscriber._protocol import streaming_pull_manager
import mock
import pytest
def test_add_and_remove():
leaser_ = leaser.Leaser(mock.sentinel.manager)
leaser_.add([requests.LeaseRequest(ack_id="ack1", byte_size=50, ordering_key="")])
leaser_.add([requests.LeaseRequest(ack_id="ack2", byte_size=25, ordering_key="")])
assert leaser_.message_count == 2
assert set(leaser_.ack_ids) == set(["ack1", "ack2"])
assert leaser_.bytes == 75
leaser_.remove([requests.DropRequest(ack_id="ack1", byte_size=50, ordering_key="")])
assert leaser_.message_count == 1
assert set(leaser_.ack_ids) == set(["ack2"])
assert leaser_.bytes == 25
def test_add_already_managed(caplog):
caplog.set_level(logging.DEBUG)
leaser_ = leaser.Leaser(mock.sentinel.manager)
leaser_.add([requests.LeaseRequest(ack_id="ack1", byte_size=50, ordering_key="")])
leaser_.add([requests.LeaseRequest(ack_id="ack1", byte_size=50, ordering_key="")])
assert "already lease managed" in caplog.text
def test_remove_not_managed(caplog):
caplog.set_level(logging.DEBUG)
leaser_ = leaser.Leaser(mock.sentinel.manager)
leaser_.remove([requests.DropRequest(ack_id="ack1", byte_size=50, ordering_key="")])
assert "not managed" in caplog.text
def test_remove_negative_bytes(caplog):
caplog.set_level(logging.DEBUG)
leaser_ = leaser.Leaser(mock.sentinel.manager)
leaser_.add([requests.LeaseRequest(ack_id="ack1", byte_size=50, ordering_key="")])
leaser_.remove([requests.DropRequest(ack_id="ack1", byte_size=75, ordering_key="")])
assert leaser_.bytes == 0
assert "unexpectedly negative" in caplog.text
def create_manager(flow_control=types.FlowControl()):
manager = mock.create_autospec(
streaming_pull_manager.StreamingPullManager, instance=True
)
manager.dispatcher = mock.create_autospec(dispatcher.Dispatcher, instance=True)
manager.is_active = True
manager.flow_control = flow_control
manager.ack_histogram = histogram.Histogram()
manager.ack_deadline = 10
return manager
def test_maintain_leases_inactive(caplog):
caplog.set_level(logging.INFO)
manager = create_manager()
manager.is_active = False
leaser_ = leaser.Leaser(manager)
leaser_.maintain_leases()
assert "exiting" in caplog.text
def test_maintain_leases_stopped(caplog):
caplog.set_level(logging.INFO)
manager = create_manager()
leaser_ = leaser.Leaser(manager)
leaser_.stop()
leaser_.maintain_leases()
assert "exiting" in caplog.text
def make_sleep_mark_manager_as_inactive(leaser):
# Make sleep mark the manager as inactive so that maintain_leases
# exits at the end of the first run.
def trigger_inactive(timeout):
assert 0 < timeout < 10
leaser._manager.is_active = False
leaser._stop_event.wait = trigger_inactive
def test_maintain_leases_ack_ids():
manager = create_manager()
leaser_ = leaser.Leaser(manager)
make_sleep_mark_manager_as_inactive(leaser_)
leaser_.add(
[requests.LeaseRequest(ack_id="my ack id", byte_size=50, ordering_key="")]
)
leaser_.maintain_leases()
manager.dispatcher.modify_ack_deadline.assert_called_once_with(
[requests.ModAckRequest(ack_id="my ack id", seconds=10)]
)
def test_maintain_leases_no_ack_ids():
manager = create_manager()
leaser_ = leaser.Leaser(manager)
make_sleep_mark_manager_as_inactive(leaser_)
leaser_.maintain_leases()
manager.dispatcher.modify_ack_deadline.assert_not_called()
@mock.patch("time.time", autospec=True)
def test_maintain_leases_outdated_items(time):
manager = create_manager()
leaser_ = leaser.Leaser(manager)
make_sleep_mark_manager_as_inactive(leaser_)
# Add and start expiry timer at the beginning of the timeline.
time.return_value = 0
leaser_.add([requests.LeaseRequest(ack_id="ack1", byte_size=50, ordering_key="")])
leaser_.start_lease_expiry_timer(["ack1"])
# Add a message but don't start the lease expiry timer.
leaser_.add([requests.LeaseRequest(ack_id="ack2", byte_size=50, ordering_key="")])
# Add a message and start expiry timer towards the end of the timeline.
time.return_value = manager.flow_control.max_lease_duration - 1
leaser_.add([requests.LeaseRequest(ack_id="ack3", byte_size=50, ordering_key="")])
leaser_.start_lease_expiry_timer(["ack3"])
# Add a message towards the end of the timeline, but DO NOT start expiry
# timer.
leaser_.add([requests.LeaseRequest(ack_id="ack4", byte_size=50, ordering_key="")])
# Now make sure time reports that we are past the end of our timeline.
time.return_value = manager.flow_control.max_lease_duration + 1
leaser_.maintain_leases()
# ack2, ack3, and ack4 should be renewed. ack1 should've been dropped
modacks = manager.dispatcher.modify_ack_deadline.call_args.args[0]
expected = [
requests.ModAckRequest(ack_id="ack2", seconds=10),
requests.ModAckRequest(ack_id="ack3", seconds=10),
requests.ModAckRequest(ack_id="ack4", seconds=10),
]
# Use sorting to allow for ordering variance.
assert sorted(modacks) == sorted(expected)
manager.dispatcher.drop.assert_called_once_with(
[requests.DropRequest(ack_id="ack1", byte_size=50, ordering_key="")]
)
def test_start_lease_expiry_timer_unknown_ack_id():
manager = create_manager()
leaser_ = leaser.Leaser(manager)
# Nothing happens when this method is called with an ack-id that hasn't been
# added yet.
leaser_.start_lease_expiry_timer(["ack1"])
@mock.patch("threading.Thread", autospec=True)
def test_start(thread):
manager = mock.create_autospec(
streaming_pull_manager.StreamingPullManager, instance=True
)
leaser_ = leaser.Leaser(manager)
leaser_.start()
thread.assert_called_once_with(
name=leaser._LEASE_WORKER_NAME, target=leaser_.maintain_leases
)
thread.return_value.start.assert_called_once()
assert leaser_._thread is not None
@mock.patch("threading.Thread", autospec=True)
def test_start_already_started(thread):
manager = mock.create_autospec(
streaming_pull_manager.StreamingPullManager, instance=True
)
leaser_ = leaser.Leaser(manager)
leaser_._thread = mock.sentinel.thread
with pytest.raises(ValueError):
leaser_.start()
thread.assert_not_called()
def test_stop():
manager = mock.create_autospec(
streaming_pull_manager.StreamingPullManager, instance=True
)
leaser_ = leaser.Leaser(manager)
thread = mock.create_autospec(threading.Thread, instance=True)
leaser_._thread = thread
leaser_.stop()
assert leaser_._stop_event.is_set()
thread.join.assert_called_once()
assert leaser_._thread is None
def test_stop_no_join():
leaser_ = leaser.Leaser(mock.sentinel.manager)
leaser_.stop()