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The shell version of the test was completed only after all DNS zone updates were sent, even if the BIND server crashed while processing them, leading to prolonged execution and potential hang in the CI environment. The Python rewrite of the test ensures that DNS update tasks finish within five minutes of starting, irrespective of a BIND crash possibility or DNS zone updates not finishing in time.
79 lines
2.5 KiB
Python
79 lines
2.5 KiB
Python
# Copyright (C) Internet Systems Consortium, Inc. ("ISC")
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#
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# SPDX-License-Identifier: MPL-2.0
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#
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this
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# file, you can obtain one at https://mozilla.org/MPL/2.0/.
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#
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# See the COPYRIGHT file distributed with this work for additional
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# information regarding copyright ownership.
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import concurrent.futures
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import os
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import subprocess
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import time
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import dns.query
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import dns.update
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def rndc_loop(test_state, server):
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rndc = os.getenv("RNDC")
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port = os.getenv("CONTROLPORT")
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cmdline = [
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rndc,
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"-c",
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"../common/rndc.conf",
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"-p",
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port,
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"-s",
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server,
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"reload",
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]
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while not test_state["finished"]:
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subprocess.run(cmdline, check=False)
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time.sleep(1)
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def update_zone(test_state, zone, named_port, logger):
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server = "10.53.0.2"
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for i in range(1000):
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if test_state["finished"]:
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return
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update = dns.update.UpdateMessage(zone)
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update.add(f"dynamic-{i}.{zone}", 300, "TXT", f"txt-{i}")
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try:
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response = dns.query.udp(update, server, 10, named_port)
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assert response.rcode() == dns.rcode.NOERROR
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except dns.exception.Timeout:
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logger.info(f"error: query timeout for {zone}")
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logger.info(f"Update of {server} zone {zone} successful")
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# If the test has run to completion without named crashing, it has succeeded.
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def test_update_stress(named_port, logger):
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test_state = {"finished": False}
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with concurrent.futures.ThreadPoolExecutor() as executor:
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executor.submit(rndc_loop, test_state, "10.53.0.3")
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updaters = []
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for i in range(5):
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zone = f"zone00000{i}.example."
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updaters.append(
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executor.submit(update_zone, test_state, zone, named_port, logger)
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)
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# All the update_zone() tasks are expected to complete within 5
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# minutes. If they do not, we cannot assert immediately as that will
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# cause the ThreadPoolExecutor context manager to wait indefinitely;
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# instead, we first signal all tasks that it is time to exit and only
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# check whether any task failed to finish within 5 minutes outside of
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# the ThreadPoolExecutor context manager.
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unfinished_tasks = concurrent.futures.wait(updaters, timeout=300).not_done
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test_state["finished"] = True
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assert not unfinished_tasks
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