blob: 6848c68af7e1c6130310d4da151d3deef2ebd32b [file] [log] [blame]
# Licensed to the Apache Software Foundation (ASF) under one
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# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
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# under the License
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
import os
import subprocess
import time
import test_subprocess
from test_unittest import unittest
# 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")
@unittest.skip("temporarily disabled (epoll fix pending)")
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 + 1):
receiver = test_subprocess.Popen(["receive", "", b.port, str(i)], stdout=self.devnull)
# All FDs are now in use, send attempt will (with present implementation) hang
with test_subprocess.Popen(["send", "", b.port, "x"],
stdout=self.devnull, stderr=subprocess.STDOUT) as sender:
time.sleep(1) # polling for None immediately would always succeed, regardless whether send hangs or not
# Kill receivers to free up FDs
for r in receivers:
for r in receivers:
# Sender now succeeded and exited
self.assertEqual(sender.wait(), 0)
# 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__":