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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you 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
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import os
import subprocess
import time
import unittest
import test_subprocess
# Check if we can run prlimit to control resources
assert subprocess.check_call(["prlimit"], stdout=open(os.devnull, 'w')) == 0, 'prlimit is present, but broken'
prlimit_available = True
except OSError:
prlimit_available = False
class PRLimitedBroker(test_subprocess.Server):
def __init__(self, fdlimit, *args, **kwargs):
super(PRLimitedBroker, self).__init__(
['prlimit', '-n{0:d}:'.format(fdlimit), "broker", "", "0"], # `-n 256:` sets only soft limit to 256
stdout=subprocess.PIPE, universal_newlines=True, *args, **kwargs)
self.fdlimit = fdlimit
class FdLimitTest(unittest.TestCase):
devnull = open(os.devnull, 'w')
def tearDownClass(cls):
if cls.devnull:
@unittest.skipUnless(prlimit_available, "prlimit not available")
def test_fd_limit_broker(self):
"""Check behaviour when running out of file descriptors on accept"""
# Not too many FDs but not too few either, some are used for system purposes.
fdlimit = 256
with PRLimitedBroker(fdlimit, kill_me=True) as b:
receivers = []
# Start enough receivers to use all FDs
# NOTE: broker does not log a file descriptor related error at any point in the test, only
# PN_TRANSPORT_CLOSED: amqp:connection:framing-error: connection aborted
# PN_TRANSPORT_CLOSED: proton:io: Connection reset by peer - disconnected :5672 (connection aborted)
for i in range(fdlimit):
receiver = subprocess.Popen(["receive", "", b.port, str(i)], stdout=self.devnull, stderr=subprocess.STDOUT)
# Allow these subprocesses time to establish ahead of the upcoming test sender.
# All FDs are now in use, new send should not succeed. May fail by hanging (epoll) or by
# immediate failure (libuv). But poll() should never be 0.
sender = subprocess.Popen(["send", "", b.port, "x"],
stdout=self.devnull, stderr=subprocess.STDOUT)
time.sleep(1) # polling for None immediately would always succeed, regardless whether send hangs or not
self.assertNotEqual(sender.poll(), 0)
# Kill receivers to free up FDs
for r in receivers:
for r in receivers:
# Sender completes on its own
# Additional send/receive should succeed now
self.assertIn("10 messages sent", test_subprocess.check_output(
["send", "", b.port], universal_newlines=True))
self.assertIn("10 messages received", test_subprocess.check_output(
["receive", "", b.port], universal_newlines=True))
if __name__ == "__main__":