test_PROTON_2121_blocking_connection_fd_leak.py

#
# 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
#
#   http://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
#

"""
PROTON-2121 python-qpid-proton 0.28 BlockingConnection leaks connections (does not close file descriptors)
"""

import contextlib
import gc
import os
import socket
import subprocess
import threading
import unittest
import warnings

import cproton

import proton.handlers
import proton.utils
import proton.reactor


def get_fd_set():
    # type: () -> set[str]
    return set(os.listdir('/proc/self/fd/'))


@contextlib.contextmanager
def no_fd_leaks(test):
    # type: (unittest.TestCase) -> None
    with warnings.catch_warnings(record=True) as ws:
        before = get_fd_set()
        yield
        delta = get_fd_set().difference(before)
        if len(delta) != 0:
            subprocess.check_call("ls -lF /proc/{0}/fd/".format(os.getpid()), shell=True)
            test.fail("Found {0} new fd(s) after the test".format(delta))

        if len(ws) > 0:
            test.fail([w.message for w in ws])


class Broker(proton.handlers.MessagingHandler):
    def __init__(self, acceptor_url):
        # type: (str) -> None
        super(Broker, self).__init__()
        self.acceptor_url = acceptor_url

        self.acceptor = None
        self._acceptor_opened_event = threading.Event()

    def get_acceptor_sockname(self):
        # type: () -> (str, int)
        self._acceptor_opened_event.wait()
        if hasattr(self.acceptor, '_selectable'):  # proton 0.30.0+
            sockname = self.acceptor._selectable._delegate.getsockname()
        else:  # works in proton 0.27.0
            selectable = cproton.pn_cast_pn_selectable(self.acceptor._impl)
            fd = cproton.pn_selectable_get_fd(selectable)
            s = socket.fromfd(fd, socket.AF_INET, socket.SOCK_STREAM)
            sockname = s.getsockname()
        return sockname[:2]

    def on_start(self, event):
        self.acceptor = event.container.listen(self.acceptor_url)
        self._acceptor_opened_event.set()

    def on_link_opening(self, event):
        if event.link.is_sender:
            assert not event.link.remote_source.dynamic, "This cannot happen"
            event.link.source.address = event.link.remote_source.address
        elif event.link.remote_target.address:
            event.link.target.address = event.link.remote_target.address


@contextlib.contextmanager
def test_broker():
    broker = Broker('localhost:0')
    container = proton.reactor.Container(broker)
    threading.Thread(target=container.run).start()

    try:
        yield broker
    finally:
        container.stop()


PROC_SELF_FD_EXISTS = os.path.exists("/proc/self/fd"), "Skipped: Directory /proc/self/fd does not exist"


class BlockingConnectionFDLeakTests(unittest.TestCase):
    @unittest.skipUnless(*PROC_SELF_FD_EXISTS)
    @unittest.expectedFailure
    def test_just_start_stop_test_broker(self):
        with no_fd_leaks(self):
            with test_broker() as broker:
                broker.get_acceptor_sockname()  # wait for acceptor to open

            gc.collect()

    @unittest.skipUnless(*PROC_SELF_FD_EXISTS)
    @unittest.expectedFailure
    def test_connection_close_all(self):
        with no_fd_leaks(self):
            with test_broker() as broker:
                c = proton.utils.BlockingConnection("{0}:{1}".format(*broker.get_acceptor_sockname()))
                c.close()

            gc.collect()

    @unittest.skipUnless(*PROC_SELF_FD_EXISTS)
    def test_connection_close_all__do_not_check_test_broker(self):
        with test_broker() as broker:
            acceptor_sockname = broker.get_acceptor_sockname()
            with no_fd_leaks(self):
                c = proton.utils.BlockingConnection("{0}:{1}".format(*acceptor_sockname))
                c.close()

                gc.collect()

    @unittest.skipUnless(*PROC_SELF_FD_EXISTS)
    @unittest.expectedFailure
    def test_connection_sender_close_all(self):
        with no_fd_leaks(self):
            with test_broker() as broker:
                c = proton.utils.BlockingConnection("{0}:{1}".format(*broker.get_acceptor_sockname()))
                s = c.create_sender("anAddress")
                s.close()
                c.close()

            gc.collect()

    @unittest.skipUnless(*PROC_SELF_FD_EXISTS)
    @unittest.expectedFailure
    def test_connection_receiver_close_all(self):
        with no_fd_leaks(self):
            with test_broker() as broker:
                c = proton.utils.BlockingConnection("{0}:{1}".format(*broker.get_acceptor_sockname()))
                s = c.create_receiver("anAddress")
                s.close()
                c.close()

            gc.collect()