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from __future__ import absolute_import, division, with_statement
from tornado import netutil
from tornado.ioloop import IOLoop
from tornado.iostream import IOStream
from tornado.testing import AsyncHTTPTestCase, LogTrapTestCase, get_unused_port
from tornado.util import b
from tornado.web import RequestHandler, Application
import errno
import socket
import sys
import time
class HelloHandler(RequestHandler):
def get(self):
self.write("Hello")
class TestIOStream(AsyncHTTPTestCase, LogTrapTestCase):
def get_app(self):
return Application([('/', HelloHandler)])
def make_iostream_pair(self, **kwargs):
port = get_unused_port()
[listener] = netutil.bind_sockets(port, '127.0.0.1',
family=socket.AF_INET)
streams = [None, None]
def accept_callback(connection, address):
streams[0] = IOStream(connection, io_loop=self.io_loop, **kwargs)
self.stop()
def connect_callback():
streams[1] = client_stream
self.stop()
netutil.add_accept_handler(listener, accept_callback,
io_loop=self.io_loop)
client_stream = IOStream(socket.socket(), io_loop=self.io_loop,
**kwargs)
client_stream.connect(('127.0.0.1', port),
callback=connect_callback)
self.wait(condition=lambda: all(streams))
self.io_loop.remove_handler(listener.fileno())
listener.close()
return streams
def test_read_zero_bytes(self):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
s.connect(("localhost", self.get_http_port()))
self.stream = IOStream(s, io_loop=self.io_loop)
self.stream.write(b("GET / HTTP/1.0\r\n\r\n"))
# normal read
self.stream.read_bytes(9, self.stop)
data = self.wait()
self.assertEqual(data, b("HTTP/1.0 "))
# zero bytes
self.stream.read_bytes(0, self.stop)
data = self.wait()
self.assertEqual(data, b(""))
# another normal read
self.stream.read_bytes(3, self.stop)
data = self.wait()
self.assertEqual(data, b("200"))
s.close()
def test_write_zero_bytes(self):
# Attempting to write zero bytes should run the callback without
# going into an infinite loop.
server, client = self.make_iostream_pair()
server.write(b(''), callback=self.stop)
self.wait()
# As a side effect, the stream is now listening for connection
# close (if it wasn't already), but is not listening for writes
self.assertEqual(server._state, IOLoop.READ | IOLoop.ERROR)
server.close()
client.close()
def test_connection_refused(self):
# When a connection is refused, the connect callback should not
# be run. (The kqueue IOLoop used to behave differently from the
# epoll IOLoop in this respect)
port = get_unused_port()
stream = IOStream(socket.socket(), self.io_loop)
self.connect_called = False
def connect_callback():
self.connect_called = True
stream.set_close_callback(self.stop)
stream.connect(("localhost", port), connect_callback)
self.wait()
self.assertFalse(self.connect_called)
self.assertTrue(isinstance(stream.error, socket.error), stream.error)
if sys.platform != 'cygwin':
# cygwin's errnos don't match those used on native windows python
self.assertEqual(stream.error.args[0], errno.ECONNREFUSED)
def test_gaierror(self):
# Test that IOStream sets its exc_info on getaddrinfo error
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
stream = IOStream(s, io_loop=self.io_loop)
stream.set_close_callback(self.stop)
stream.connect(('adomainthatdoesntexist.asdf', 54321))
self.assertTrue(isinstance(stream.error, socket.gaierror), stream.error)
def test_connection_closed(self):
# When a server sends a response and then closes the connection,
# the client must be allowed to read the data before the IOStream
# closes itself. Epoll reports closed connections with a separate
# EPOLLRDHUP event delivered at the same time as the read event,
# while kqueue reports them as a second read/write event with an EOF
# flag.
response = self.fetch("/", headers={"Connection": "close"})
response.rethrow()
def test_read_until_close(self):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0)
s.connect(("localhost", self.get_http_port()))
stream = IOStream(s, io_loop=self.io_loop)
stream.write(b("GET / HTTP/1.0\r\n\r\n"))
stream.read_until_close(self.stop)
data = self.wait()
self.assertTrue(data.startswith(b("HTTP/1.0 200")))
self.assertTrue(data.endswith(b("Hello")))
def test_streaming_callback(self):
server, client = self.make_iostream_pair()
try:
chunks = []
final_called = []
def streaming_callback(data):
chunks.append(data)
self.stop()
def final_callback(data):
assert not data
final_called.append(True)
self.stop()
server.read_bytes(6, callback=final_callback,
streaming_callback=streaming_callback)
client.write(b("1234"))
self.wait(condition=lambda: chunks)
client.write(b("5678"))
self.wait(condition=lambda: final_called)
self.assertEqual(chunks, [b("1234"), b("56")])
# the rest of the last chunk is still in the buffer
server.read_bytes(2, callback=self.stop)
data = self.wait()
self.assertEqual(data, b("78"))
finally:
server.close()
client.close()
def test_streaming_until_close(self):
server, client = self.make_iostream_pair()
try:
chunks = []
def callback(data):
chunks.append(data)
self.stop()
client.read_until_close(callback=callback,
streaming_callback=callback)
server.write(b("1234"))
self.wait()
server.write(b("5678"))
self.wait()
server.close()
self.wait()
self.assertEqual(chunks, [b("1234"), b("5678"), b("")])
finally:
server.close()
client.close()
def test_delayed_close_callback(self):
# The scenario: Server closes the connection while there is a pending
# read that can be served out of buffered data. The client does not
# run the close_callback as soon as it detects the close, but rather
# defers it until after the buffered read has finished.
server, client = self.make_iostream_pair()
try:
client.set_close_callback(self.stop)
server.write(b("12"))
chunks = []
def callback1(data):
chunks.append(data)
client.read_bytes(1, callback2)
server.close()
def callback2(data):
chunks.append(data)
client.read_bytes(1, callback1)
self.wait() # stopped by close_callback
self.assertEqual(chunks, [b("1"), b("2")])
finally:
server.close()
client.close()
def test_close_buffered_data(self):
# Similar to the previous test, but with data stored in the OS's
# socket buffers instead of the IOStream's read buffer. Out-of-band
# close notifications must be delayed until all data has been
# drained into the IOStream buffer. (epoll used to use out-of-band
# close events with EPOLLRDHUP, but no longer)
#
# This depends on the read_chunk_size being smaller than the
# OS socket buffer, so make it small.
server, client = self.make_iostream_pair(read_chunk_size=256)
try:
server.write(b("A") * 512)
client.read_bytes(256, self.stop)
data = self.wait()
self.assertEqual(b("A") * 256, data)
server.close()
# Allow the close to propagate to the client side of the
# connection. Using add_callback instead of add_timeout
# doesn't seem to work, even with multiple iterations
self.io_loop.add_timeout(time.time() + 0.01, self.stop)
self.wait()
client.read_bytes(256, self.stop)
data = self.wait()
self.assertEqual(b("A") * 256, data)
finally:
server.close()
client.close()
def test_large_read_until(self):
# Performance test: read_until used to have a quadratic component
# so a read_until of 4MB would take 8 seconds; now it takes 0.25
# seconds.
server, client = self.make_iostream_pair()
try:
NUM_KB = 4096
for i in xrange(NUM_KB):
client.write(b("A") * 1024)
client.write(b("\r\n"))
server.read_until(b("\r\n"), self.stop)
data = self.wait()
self.assertEqual(len(data), NUM_KB * 1024 + 2)
finally:
server.close()
client.close()
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