Current File : //usr/lib64/python2.7/site-packages/tornado/test/util.py
from __future__ import absolute_import, division, print_function, with_statement
import os
import socket
import sys
from tornado.testing import bind_unused_port
# Encapsulate the choice of unittest or unittest2 here.
# To be used as 'from tornado.test.util import unittest'.
if sys.version_info < (2, 7):
# In py26, we must always use unittest2.
import unittest2 as unittest
else:
# Otherwise, use whichever version of unittest was imported in
# tornado.testing.
from tornado.testing import unittest
skipIfNonUnix = unittest.skipIf(os.name != 'posix' or sys.platform == 'cygwin',
"non-unix platform")
# travis-ci.org runs our tests in an overworked virtual machine, which makes
# timing-related tests unreliable.
skipOnTravis = unittest.skipIf('TRAVIS' in os.environ,
'timing tests unreliable on travis')
# Set the environment variable NO_NETWORK=1 to disable any tests that
# depend on an external network.
skipIfNoNetwork = unittest.skipIf('NO_NETWORK' in os.environ,
'network access disabled')
skipIfNoIPv6 = unittest.skipIf(not socket.has_ipv6, 'ipv6 support not present')
def refusing_port():
"""Returns a local port number that will refuse all connections.
Return value is (cleanup_func, port); the cleanup function
must be called to free the port to be reused.
"""
# On travis-ci, port numbers are reassigned frequently. To avoid
# collisions with other tests, we use an open client-side socket's
# ephemeral port number to ensure that nothing can listen on that
# port.
server_socket, port = bind_unused_port()
server_socket.setblocking(1)
client_socket = socket.socket()
client_socket.connect(("127.0.0.1", port))
conn, client_addr = server_socket.accept()
conn.close()
server_socket.close()
return (client_socket.close, client_addr[1])
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