"""
Test cases for twisted.protocols.stateful
"""
from twisted.test import test_protocols
from twisted.protocols.stateful import StatefulProtocol
from struct import pack, unpack
class MyInt32StringReceiver(StatefulProtocol):
MAX_LENGTH = 99999
def getInitialState(self):
return self._getHeader, 4
def _getHeader(self, msg):
length, = unpack("!i", msg)
if length > self.MAX_LENGTH:
self.transport.loseConnection()
return
return self._getString, length
def _getString(self, msg):
self.stringReceived(msg)
return self._getHeader, 4
def stringReceived(self, msg):
"""Override this.
"""
raise NotImplementedError
def sendString(self, data):
"""Send an int32-prefixed string to the other end of the connection.
"""
self.transport.write(pack("!i",len(data))+data)
class TestInt32(MyInt32StringReceiver):
def connectionMade(self):
self.received = []
def stringReceived(self, s):
self.received.append(s)
MAX_LENGTH = 50
closed = 0
def connectionLost(self, reason):
self.closed = 1
class Int32TestCase(test_protocols.Int32TestCase):
protocol = TestInt32
def testBigReceive(self):
r = self.getProtocol()
big = ""
for s in self.strings * 4:
big += pack("!i",len(s))+s
r.dataReceived(big)
self.assertEquals(r.received, self.strings * 4)