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# IVLE - Informatics Virtual Learning Environment
# Copyright (C) 2007-2010 The University of Melbourne
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import socket
import os
import random
import cjson
from nose.tools import assert_equal, raises
import ivle.chat
TIMEOUT = 0.1
NULLNETSTRING = "0:,"
SIMPLESTRING = "Hello world!"
SIMPLENETSTRING = "12:Hello world!,"
class TestChat(object):
def setUp(self):
"""Creates a socket pair for testing"""
self.s1, self.s2 = socket.socketpair()
self.s1.settimeout(TIMEOUT)
self.s2.settimeout(TIMEOUT)
def tearDown(self):
"""Closes the socket pair"""
self.s1.close()
self.s2.close()
def test_send_null_netstring(self):
"""Check that we construct a empty Netstring correctly"""
ivle.chat.send_netstring(self.s1, "")
assert_equal(self.s2.recv(1024), NULLNETSTRING)
def test_send_simple_netstring(self):
"""Check that we construct a simple Netstring correctly"""
ivle.chat.send_netstring(self.s1, SIMPLESTRING)
assert_equal(self.s2.recv(1024), SIMPLENETSTRING)
def test_recv_null_netstring(self):
"""Check that we can decode a null Netstring"""
self.s1.sendall(NULLNETSTRING)
assert_equal(ivle.chat.recv_netstring(self.s2), "")
def test_recv_null_netstring(self):
"""Check that we can decode a simple Netstring"""
self.s1.sendall(SIMPLENETSTRING)
assert_equal(ivle.chat.recv_netstring(self.s2), SIMPLESTRING)
@raises(socket.timeout)
def test_invalid_short_netstring(self):
self.s1.sendall("1234:not that long!,")
assert ivle.chat.recv_netstring(self.s2) is None
@raises(ivle.chat.ProtocolError)
def test_invalid_long_netstring(self):
self.s1.sendall("5:not that short!,")
assert ivle.chat.recv_netstring(self.s2) is None
def test_long_netstring(self):
# XXX: send() may block if this is too big
msg = os.urandom(50000)
ivle.chat.send_netstring(self.s1, msg)
assert ivle.chat.recv_netstring(self.s2) == msg
def test_multiple_netstrings(self):
messages = []
for i in range(10):
message = os.urandom(random.randint(0,20))
messages.append(message)
ivle.chat.send_netstring(self.s1, message)
for i in range(10):
assert_equal(ivle.chat.recv_netstring(self.s2), messages[i])
def test_encode(self):
"""Check that we correctly encode a basic object
"""
MESSAGE = {}
MAGIC = "3EE"
content = cjson.encode(MESSAGE)
# Digest can be formed with `echo -n "${content}${MAGIC}" | md5sum`
DIGEST = '2b59b68e1ac0852b87fb7e64946f2658'
expected = {'digest': DIGEST,
'content': content}
encoded = ivle.chat.encode(MESSAGE, MAGIC)
assert_equal(cjson.decode(encoded), expected)
def test_encode_decode(self):
"""Check that a round trip encoding and decoding works
"""
MESSAGE = {'message': 'Hello, world'}
MAGIC = "MagicString"
encoded = ivle.chat.encode(MESSAGE, MAGIC)
decoded = ivle.chat.decode(encoded, MAGIC)
assert_equal(decoded, MESSAGE)
@raises(ivle.chat.ProtocolError)
def test_decode_bad_magic(self):
"""Check that a bad digest causes a ProtocolError to be raised
"""
CHATMESSAGE = ('{"content": "{\\"a\\": \\"b\\"}", "digest": ' +
'"eb860a5fe8fdbef19ffb79e3a5c47113"}')
CORRECTMAGIC = "AEIOU"
INCORRECTMAGIC = "ABCDE"
# Check our "correct" string decodes without a ProtocolError
try:
ivle.chat.decode(CHATMESSAGE, CORRECTMAGIC)
except ivle.chat.ProtocolError:
raise AssertionError("ProtocolError with 'correct' magic")
# This should raise the ProtocolError
ivle.chat.decode(CHATMESSAGE, INCORRECTMAGIC)
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