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"""
AMAK: 20050515: This module is a brand new test_select module, which gives much wider coverage.
"""
import errno
import time
from test import test_support
import unittest
import socket
import select
SERVER_ADDRESS = ("localhost", 54321)
DATA_CHUNK_SIZE = 1000
DATA_CHUNK = "." * DATA_CHUNK_SIZE
#
# The timing of these tests depends on the how the unerlying OS socket library
# handles buffering. These values may need tweaking for different platforms
#
# The fundamental problem is that there is no reliable way to fill a socket with bytes
#
if test_support.is_jython:
SELECT_TIMEOUT = 0
else:
# zero select timeout fails these tests on cpython (on windows 2003 anyway)
SELECT_TIMEOUT = 0.001
READ_TIMEOUT = 5
class AsynchronousServer:
def __init__(self):
self.server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.server_socket.setblocking(0)
self.server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.server_socket.bind(SERVER_ADDRESS)
self.server_socket.listen(5)
try:
self.server_socket.accept()
except socket.error:
pass
def select_acceptable(self):
return select.select([self.server_socket], [self.server_socket], [], SELECT_TIMEOUT)[0]
def verify_acceptable(self):
start = time.time()
while True:
if self.select_acceptable():
return
elif (time.time() - start) > READ_TIMEOUT:
raise Exception('Server socket did not accept in time')
time.sleep(0.1)
def verify_not_acceptable(self):
assert not self.select_acceptable(), "Server socket should not be acceptable"
def accept(self):
self.verify_acceptable()
new_socket, address = self.server_socket.accept()
return AsynchronousHandler(new_socket)
def close(self):
self.server_socket.close()
class AsynchronousHandler:
def __init__(self, new_socket):
self.socket = new_socket
self.socket.setblocking(0)
self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
def write(self):
"""
Writes on this channel until select no longer reports it as writable.
Returns the number of bytes written
"""
total_bytes = 0
while 1:
try:
if self.select_writable():
bytes_sent = self.socket.send(DATA_CHUNK)
total_bytes += bytes_sent
else:
return total_bytes
except socket.error, se:
if se.value == 10035:
continue
raise se
def read(self, expected):
"""
Reads expected bytes from this socket
An Exception is raised if expected bytes aren't read before READ_TIMEOUT
is reached.
"""
results = ""
start = time.time()
while 1:
if self.select_readable():
recvd_bytes = self.socket.recv(expected - len(results))
if len(recvd_bytes):
results += recvd_bytes
if len(results) == expected:
return results
else:
stop = time.time()
if (stop - start) > READ_TIMEOUT:
raise Exception("Got %d bytes but %d bytes were written." %
(len(results), expected))
def select_readable(self):
return select.select([self.socket], [], [], SELECT_TIMEOUT)[0]
def verify_readable(self):
assert self.select_readable(), "Socket should be ready for reading"
def verify_not_readable(self):
assert not self.select_readable(), "Socket should not be ready for reading"
def select_writable(self):
return select.select([], [self.socket], [], SELECT_TIMEOUT)[1]
def verify_writable(self):
assert self.select_writable(), "Socket should be ready for writing"
def verify_not_writable(self):
assert not self.select_writable(), "Socket should not be ready for writing"
def verify_only_writable(self):
self.verify_writable()
self.verify_not_readable()
def close(self):
self.socket.close()
class AsynchronousClient(AsynchronousHandler):
def __init__(self):
AsynchronousHandler.__init__(self, socket.socket(socket.AF_INET, socket.SOCK_STREAM))
self.connected = 0
def start_connect(self):
result = self.socket.connect_ex(SERVER_ADDRESS)
if result == errno.EISCONN:
self.connected = 1
else:
assert result == errno.EINPROGRESS
def finish_connect(self):
if self.connected:
return
start = time.time()
while True:
self.start_connect()
if self.connected:
break
elif (time.time() - start) > READ_TIMEOUT:
raise Exception('Client socket incomplete connect')
time.sleep(0.1)
class TestSelectOnAccept(unittest.TestCase):
def setUp(self):
self.server = AsynchronousServer()
self.client = AsynchronousClient()
self.handler = None
def testSelectOnAccept(self):
self.server.verify_not_acceptable()
self.client.start_connect()
self.server.verify_acceptable()
self.handler = self.server.accept()
self.client.finish_connect()
self.server.verify_not_acceptable()
def tearDown(self):
self.client.close()
if self.handler:
self.handler.close()
self.server.close()
class TestSelect(unittest.TestCase):
def setUp(self):
self.server = AsynchronousServer()
self.client = AsynchronousClient()
self.client.start_connect()
self.handler = self.server.accept()
self.client.finish_connect()
def tearDown(self):
self.client.close()
self.handler.close()
self.server.close()
def testClientOut(self):
self.client.verify_only_writable()
self.handler.verify_only_writable()
written = self.client.write()
self.handler.verify_readable()
self.handler.read(written/2)
self.handler.verify_readable()
self.handler.read(written/2)
self.handler.verify_not_readable()
def testHandlerOut(self):
written = self.handler.write()
self.client.verify_readable()
self.client.read(written/2)
self.client.verify_readable()
self.client.read(written/2)
self.client.verify_not_readable()
def testBothOut(self):
client_written = self.client.write()
handler_written = self.handler.write()
self.client.verify_readable()
self.handler.verify_readable()
self.client.read(handler_written/2)
self.handler.read(client_written/2)
self.client.verify_readable()
self.handler.verify_readable()
self.client.read(handler_written/2)
self.handler.read(client_written/2)
self.client.verify_only_writable()
self.handler.verify_only_writable()
def test_main():
tests = [TestSelect, TestSelectOnAccept]
suites = [unittest.makeSuite(klass, 'test') for klass in tests]
test_support.run_suite(unittest.TestSuite(suites))
if __name__ == "__main__":
test_main()
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