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# test asynchat
from test import support
import asynchat
import asyncore
import errno
import socket
import sys
import _thread as thread
import threading
import time
import unittest
import unittest.mock
HOST = support.HOST
SERVER_QUIT = b'QUIT\n'
TIMEOUT = 3.0
class echo_server(threading.Thread):
# parameter to determine the number of bytes passed back to the
# client each send
chunk_size = 1
def __init__(self, event):
threading.Thread.__init__(self)
self.event = event
self.sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.port = support.bind_port(self.sock)
# This will be set if the client wants us to wait before echoing
# data back.
self.start_resend_event = None
def run(self):
self.sock.listen()
self.event.set()
conn, client = self.sock.accept()
self.buffer = b""
# collect data until quit message is seen
while SERVER_QUIT not in self.buffer:
data = conn.recv(1)
if not data:
break
self.buffer = self.buffer + data
# remove the SERVER_QUIT message
self.buffer = self.buffer.replace(SERVER_QUIT, b'')
if self.start_resend_event:
self.start_resend_event.wait()
# re-send entire set of collected data
try:
# this may fail on some tests, such as test_close_when_done,
# since the client closes the channel when it's done sending
while self.buffer:
n = conn.send(self.buffer[:self.chunk_size])
time.sleep(0.001)
self.buffer = self.buffer[n:]
except:
pass
conn.close()
self.sock.close()
class echo_client(asynchat.async_chat):
def __init__(self, terminator, server_port):
asynchat.async_chat.__init__(self)
self.contents = []
self.create_socket(socket.AF_INET, socket.SOCK_STREAM)
self.connect((HOST, server_port))
self.set_terminator(terminator)
self.buffer = b""
def handle_connect(self):
pass
if sys.platform == 'darwin':
# select.poll returns a select.POLLHUP at the end of the tests
# on darwin, so just ignore it
def handle_expt(self):
pass
def collect_incoming_data(self, data):
self.buffer += data
def found_terminator(self):
self.contents.append(self.buffer)
self.buffer = b""
def start_echo_server():
event = threading.Event()
s = echo_server(event)
s.start()
event.wait()
event.clear()
time.sleep(0.01) # Give server time to start accepting.
return s, event
class TestAsynchat(unittest.TestCase):
usepoll = False
def setUp(self):
self._threads = support.threading_setup()
def tearDown(self):
support.threading_cleanup(*self._threads)
def line_terminator_check(self, term, server_chunk):
event = threading.Event()
s = echo_server(event)
s.chunk_size = server_chunk
s.start()
event.wait()
event.clear()
time.sleep(0.01) # Give server time to start accepting.
c = echo_client(term, s.port)
c.push(b"hello ")
c.push(b"world" + term)
c.push(b"I'm not dead yet!" + term)
c.push(SERVER_QUIT)
asyncore.loop(use_poll=self.usepoll, count=300, timeout=.01)
support.join_thread(s, timeout=TIMEOUT)
self.assertEqual(c.contents, [b"hello world", b"I'm not dead yet!"])
# the line terminator tests below check receiving variously-sized
# chunks back from the server in order to exercise all branches of
# async_chat.handle_read
def test_line_terminator1(self):
# test one-character terminator
for l in (1, 2, 3):
self.line_terminator_check(b'\n', l)
def test_line_terminator2(self):
# test two-character terminator
for l in (1, 2, 3):
self.line_terminator_check(b'\r\n', l)
def test_line_terminator3(self):
# test three-character terminator
for l in (1, 2, 3):
self.line_terminator_check(b'qqq', l)
def numeric_terminator_check(self, termlen):
# Try reading a fixed number of bytes
s, event = start_echo_server()
c = echo_client(termlen, s.port)
data = b"hello world, I'm not dead yet!\n"
c.push(data)
c.push(SERVER_QUIT)
asyncore.loop(use_poll=self.usepoll, count=300, timeout=.01)
support.join_thread(s, timeout=TIMEOUT)
self.assertEqual(c.contents, [data[:termlen]])
def test_numeric_terminator1(self):
# check that ints & longs both work (since type is
# explicitly checked in async_chat.handle_read)
self.numeric_terminator_check(1)
def test_numeric_terminator2(self):
self.numeric_terminator_check(6)
def test_none_terminator(self):
# Try reading a fixed number of bytes
s, event = start_echo_server()
c = echo_client(None, s.port)
data = b"hello world, I'm not dead yet!\n"
c.push(data)
c.push(SERVER_QUIT)
asyncore.loop(use_poll=self.usepoll, count=300, timeout=.01)
support.join_thread(s, timeout=TIMEOUT)
self.assertEqual(c.contents, [])
self.assertEqual(c.buffer, data)
def test_simple_producer(self):
s, event = start_echo_server()
c = echo_client(b'\n', s.port)
data = b"hello world\nI'm not dead yet!\n"
p = asynchat.simple_producer(data+SERVER_QUIT, buffer_size=8)
c.push_with_producer(p)
asyncore.loop(use_poll=self.usepoll, count=300, timeout=.01)
support.join_thread(s, timeout=TIMEOUT)
self.assertEqual(c.contents, [b"hello world", b"I'm not dead yet!"])
def test_string_producer(self):
s, event = start_echo_server()
c = echo_client(b'\n', s.port)
data = b"hello world\nI'm not dead yet!\n"
c.push_with_producer(data+SERVER_QUIT)
asyncore.loop(use_poll=self.usepoll, count=300, timeout=.01)
support.join_thread(s, timeout=TIMEOUT)
self.assertEqual(c.contents, [b"hello world", b"I'm not dead yet!"])
def test_empty_line(self):
# checks that empty lines are handled correctly
s, event = start_echo_server()
c = echo_client(b'\n', s.port)
c.push(b"hello world\n\nI'm not dead yet!\n")
c.push(SERVER_QUIT)
asyncore.loop(use_poll=self.usepoll, count=300, timeout=.01)
support.join_thread(s, timeout=TIMEOUT)
self.assertEqual(c.contents,
[b"hello world", b"", b"I'm not dead yet!"])
def test_close_when_done(self):
s, event = start_echo_server()
s.start_resend_event = threading.Event()
c = echo_client(b'\n', s.port)
c.push(b"hello world\nI'm not dead yet!\n")
c.push(SERVER_QUIT)
c.close_when_done()
asyncore.loop(use_poll=self.usepoll, count=300, timeout=.01)
# Only allow the server to start echoing data back to the client after
# the client has closed its connection. This prevents a race condition
# where the server echoes all of its data before we can check that it
# got any down below.
s.start_resend_event.set()
support.join_thread(s, timeout=TIMEOUT)
self.assertEqual(c.contents, [])
# the server might have been able to send a byte or two back, but this
# at least checks that it received something and didn't just fail
# (which could still result in the client not having received anything)
self.assertGreater(len(s.buffer), 0)
def test_push(self):
# Issue #12523: push() should raise a TypeError if it doesn't get
# a bytes string
s, event = start_echo_server()
c = echo_client(b'\n', s.port)
data = b'bytes\n'
c.push(data)
c.push(bytearray(data))
c.push(memoryview(data))
self.assertRaises(TypeError, c.push, 10)
self.assertRaises(TypeError, c.push, 'unicode')
c.push(SERVER_QUIT)
asyncore.loop(use_poll=self.usepoll, count=300, timeout=.01)
support.join_thread(s, timeout=TIMEOUT)
self.assertEqual(c.contents, [b'bytes', b'bytes', b'bytes'])
class TestAsynchat_WithPoll(TestAsynchat):
usepoll = True
class TestAsynchatMocked(unittest.TestCase):
def test_blockingioerror(self):
# Issue #16133: handle_read() must ignore BlockingIOError
sock = unittest.mock.Mock()
sock.recv.side_effect = BlockingIOError(errno.EAGAIN)
dispatcher = asynchat.async_chat()
dispatcher.set_socket(sock)
self.addCleanup(dispatcher.del_channel)
with unittest.mock.patch.object(dispatcher, 'handle_error') as error:
dispatcher.handle_read()
self.assertFalse(error.called)
class TestHelperFunctions(unittest.TestCase):
def test_find_prefix_at_end(self):
self.assertEqual(asynchat.find_prefix_at_end("qwerty\r", "\r\n"), 1)
self.assertEqual(asynchat.find_prefix_at_end("qwertydkjf", "\r\n"), 0)
class TestNotConnected(unittest.TestCase):
def test_disallow_negative_terminator(self):
# Issue #11259
client = asynchat.async_chat()
self.assertRaises(ValueError, client.set_terminator, -1)
if __name__ == "__main__":
unittest.main()