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from netlib import tcp
from netlib import test
from netlib.websockets import implementations as impl
from netlib.websockets import websockets as ws
import os
from nose.tools import raises
class TestWebSockets(test.ServerTestBase):
handler = impl.WebSocketsEchoHandler
def random_bytes(self, n = 100):
return os.urandom(n)
def echo(self, msg):
client = impl.WebSocketsClient(("127.0.0.1", self.port))
client.connect()
client.send_message(msg)
response = client.read_next_message()
assert response == msg
def test_simple_echo(self):
self.echo("hello I'm the client")
def test_frame_sizes(self):
# length can fit in the the 7 bit payload length
small_msg = self.random_bytes(100)
# 50kb, sligthly larger than can fit in a 7 bit int
medium_msg = self.random_bytes(50000)
# 150kb, slightly larger than can fit in a 16 bit int
large_msg = self.random_bytes(150000)
self.echo(small_msg)
self.echo(medium_msg)
self.echo(large_msg)
def test_default_builder(self):
"""
default builder should always generate valid frames
"""
msg = self.random_bytes()
client_frame = ws.Frame.default(msg, from_client = True)
assert client_frame.is_valid()
server_frame = ws.Frame.default(msg, from_client = False)
assert server_frame.is_valid()
def test_serialization_bijection(self):
"""
Ensure that various frame types can be serialized/deserialized back
and forth between to_bytes() and from_bytes()
"""
for is_client in [True, False]:
for num_bytes in [100, 50000, 150000]:
frame = ws.Frame.default(
self.random_bytes(num_bytes), is_client
)
assert frame == ws.Frame.from_bytes(frame.to_bytes())
bytes = b'\x81\x11cba'
assert ws.Frame.from_bytes(bytes).to_bytes() == bytes
@raises(ws.WebSocketFrameValidationException)
def test_safe_to_bytes(self):
frame = ws.Frame.default(self.random_bytes(8))
frame.actual_payload_length = 1 # corrupt the frame
frame.safe_to_bytes()
class BadHandshakeHandler(impl.WebSocketsEchoHandler):
def handshake(self):
client_hs = ws.read_handshake(self.rfile.read, 1)
ws.process_handshake_from_client(client_hs)
response = ws.create_server_handshake("malformed_key")
self.wfile.write(response)
self.wfile.flush()
self.handshake_done = True
class TestBadHandshake(test.ServerTestBase):
"""
Ensure that the client disconnects if the server handshake is malformed
"""
handler = BadHandshakeHandler
@raises(tcp.NetLibDisconnect)
def test(self):
client = impl.WebSocketsClient(("127.0.0.1", self.port))
client.connect()
client.send_message("hello")
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