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Jan Broer
2015-08-02 20:59:11 +02:00
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lib/tornado/test/iostream_test.py
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from __future__ import absolute_import, division, print_function, with_statement
from tornado import netutil
from tornado.ioloop import IOLoop
from tornado.iostream import IOStream, SSLIOStream, PipeIOStream
from tornado.log import gen_log, app_log
from tornado.netutil import ssl_wrap_socket
from tornado.stack_context import NullContext
from tornado.testing import AsyncHTTPTestCase, AsyncHTTPSTestCase, AsyncTestCase, bind_unused_port, ExpectLog
from tornado.test.util import unittest, skipIfNonUnix
from tornado.web import RequestHandler, Application
import errno
import logging
import os
import platform
import socket
import ssl
import sys
class HelloHandler(RequestHandler):
def get(self):
self.write("Hello")
class TestIOStreamWebMixin(object):
def _make_client_iostream(self):
raise NotImplementedError()
def get_app(self):
return Application([('/', HelloHandler)])
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):
stream = self._make_client_iostream()
stream.connect(('localhost', self.get_http_port()), callback=self.stop)
self.wait()
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_read_zero_bytes(self):
self.stream = self._make_client_iostream()
self.stream.connect(("localhost", self.get_http_port()),
callback=self.stop)
self.wait()
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")
self.stream.close()
def test_write_while_connecting(self):
stream = self._make_client_iostream()
connected = [False]
def connected_callback():
connected[0] = True
self.stop()
stream.connect(("localhost", self.get_http_port()),
callback=connected_callback)
# unlike the previous tests, try to write before the connection
# is complete.
written = [False]
def write_callback():
written[0] = True
self.stop()
stream.write(b"GET / HTTP/1.0\r\nConnection: close\r\n\r\n",
callback=write_callback)
self.assertTrue(not connected[0])
# by the time the write has flushed, the connection callback has
# also run
try:
self.wait(lambda: connected[0] and written[0])
finally:
logging.debug((connected, written))
stream.read_until_close(self.stop)
data = self.wait()
self.assertTrue(data.endswith(b"Hello"))
stream.close()
class TestIOStreamMixin(object):
def _make_server_iostream(self, connection, **kwargs):
raise NotImplementedError()
def _make_client_iostream(self, connection, **kwargs):
raise NotImplementedError()
def make_iostream_pair(self, **kwargs):
listener, port = bind_unused_port()
streams = [None, None]
def accept_callback(connection, address):
streams[0] = self._make_server_iostream(connection, **kwargs)
if isinstance(streams[0], SSLIOStream):
# HACK: The SSL handshake won't complete (and
# therefore the client connect callback won't be
# run)until the server side has tried to do something
# with the connection. For these tests we want both
# sides to connect before we do anything else with the
# connection, so we must cause some dummy activity on the
# server. If this turns out to be useful for real apps
# it should have a cleaner interface.
streams[0]._add_io_state(IOLoop.READ)
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 = self._make_client_iostream(socket.socket(), **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_streaming_callback_with_data_in_buffer(self):
server, client = self.make_iostream_pair()
client.write(b"abcd\r\nefgh")
server.read_until(b"\r\n", self.stop)
data = self.wait()
self.assertEqual(data, b"abcd\r\n")
def closed_callback(chunk):
self.fail()
server.read_until_close(callback=closed_callback,
streaming_callback=self.stop)
# self.io_loop.add_timeout(self.io_loop.time() + 0.01, self.stop)
data = self.wait()
self.assertEqual(data, b"efgh")
server.close()
client.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)
server_socket, port = bind_unused_port()
server_socket.close()
stream = IOStream(socket.socket(), self.io_loop)
self.connect_called = False
def connect_callback():
self.connect_called = True
stream.set_close_callback(self.stop)
# log messages vary by platform and ioloop implementation
with ExpectLog(gen_log, ".*", required=False):
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)
# To reliably generate a gaierror we use a malformed domain name
# instead of a name that's simply unlikely to exist (since
# opendns and some ISPs return bogus addresses for nonexistent
# domains instead of the proper error codes).
with ExpectLog(gen_log, "Connect error"):
stream.connect(('an invalid domain', 54321))
self.assertTrue(isinstance(stream.error, socket.gaierror), stream.error)
def test_read_callback_error(self):
# Test that IOStream sets its exc_info when a read callback throws
server, client = self.make_iostream_pair()
try:
server.set_close_callback(self.stop)
with ExpectLog(
app_log, "(Uncaught exception|Exception in callback)"
):
# Clear ExceptionStackContext so IOStream catches error
with NullContext():
server.read_bytes(1, callback=lambda data: 1 / 0)
client.write(b"1")
self.wait()
self.assertTrue(isinstance(server.error, ZeroDivisionError))
finally:
server.close()
client.close()
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):
self.assertFalse(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 = []
closed = [False]
def streaming_callback(data):
chunks.append(data)
self.stop()
def close_callback(data):
assert not data, data
closed[0] = True
self.stop()
client.read_until_close(callback=close_callback,
streaming_callback=streaming_callback)
server.write(b"1234")
self.wait(condition=lambda: len(chunks) == 1)
server.write(b"5678", self.stop)
self.wait()
server.close()
self.wait(condition=lambda: closed[0])
self.assertEqual(chunks, [b"1234", b"5678"])
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(self.io_loop.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_read_until_close_after_close(self):
# Similar to test_delayed_close_callback, but read_until_close takes
# a separate code path so test it separately.
server, client = self.make_iostream_pair()
client.set_close_callback(self.stop)
try:
server.write(b"1234")
server.close()
self.wait()
client.read_until_close(self.stop)
data = self.wait()
self.assertEqual(data, b"1234")
finally:
server.close()
client.close()
def test_streaming_read_until_close_after_close(self):
# Same as the preceding test but with a streaming_callback.
# All data should go through the streaming callback,
# and the final read callback just gets an empty string.
server, client = self.make_iostream_pair()
client.set_close_callback(self.stop)
try:
server.write(b"1234")
server.close()
self.wait()
streaming_data = []
client.read_until_close(self.stop,
streaming_callback=streaming_data.append)
data = self.wait()
self.assertEqual(b'', data)
self.assertEqual(b''.join(streaming_data), b"1234")
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:
# This test fails on pypy with ssl. I think it's because
# pypy's gc defeats moves objects, breaking the
# "frozen write buffer" assumption.
if (isinstance(server, SSLIOStream) and
platform.python_implementation() == 'PyPy'):
raise unittest.SkipTest(
"pypy gc causes problems with openssl")
NUM_KB = 4096
for i in range(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()
def test_close_callback_with_pending_read(self):
# Regression test for a bug that was introduced in 2.3
# where the IOStream._close_callback would never be called
# if there were pending reads.
OK = b"OK\r\n"
server, client = self.make_iostream_pair()
client.set_close_callback(self.stop)
try:
server.write(OK)
client.read_until(b"\r\n", self.stop)
res = self.wait()
self.assertEqual(res, OK)
server.close()
client.read_until(b"\r\n", lambda x: x)
# If _close_callback (self.stop) is not called,
# an AssertionError: Async operation timed out after 5 seconds
# will be raised.
res = self.wait()
self.assertTrue(res is None)
finally:
server.close()
client.close()
@skipIfNonUnix
def test_inline_read_error(self):
# An error on an inline read is raised without logging (on the
# assumption that it will eventually be noticed or logged further
# up the stack).
#
# This test is posix-only because windows os.close() doesn't work
# on socket FDs, but we can't close the socket object normally
# because we won't get the error we want if the socket knows
# it's closed.
server, client = self.make_iostream_pair()
try:
os.close(server.socket.fileno())
with self.assertRaises(socket.error):
server.read_bytes(1, lambda data: None)
finally:
server.close()
client.close()
def test_async_read_error_logging(self):
# Socket errors on asynchronous reads should be logged (but only
# once).
server, client = self.make_iostream_pair()
server.set_close_callback(self.stop)
try:
# Start a read that will be fullfilled asynchronously.
server.read_bytes(1, lambda data: None)
client.write(b'a')
# Stub out read_from_fd to make it fail.
def fake_read_from_fd():
os.close(server.socket.fileno())
server.__class__.read_from_fd(server)
server.read_from_fd = fake_read_from_fd
# This log message is from _handle_read (not read_from_fd).
with ExpectLog(gen_log, "error on read"):
self.wait()
finally:
server.close()
client.close()
class TestIOStreamWebHTTP(TestIOStreamWebMixin, AsyncHTTPTestCase):
def _make_client_iostream(self):
return IOStream(socket.socket(), io_loop=self.io_loop)
class TestIOStreamWebHTTPS(TestIOStreamWebMixin, AsyncHTTPSTestCase):
def _make_client_iostream(self):
return SSLIOStream(socket.socket(), io_loop=self.io_loop)
class TestIOStream(TestIOStreamMixin, AsyncTestCase):
def _make_server_iostream(self, connection, **kwargs):
return IOStream(connection, **kwargs)
def _make_client_iostream(self, connection, **kwargs):
return IOStream(connection, **kwargs)
class TestIOStreamSSL(TestIOStreamMixin, AsyncTestCase):
def _make_server_iostream(self, connection, **kwargs):
ssl_options = dict(
certfile=os.path.join(os.path.dirname(__file__), 'test.crt'),
keyfile=os.path.join(os.path.dirname(__file__), 'test.key'),
)
connection = ssl.wrap_socket(connection,
server_side=True,
do_handshake_on_connect=False,
**ssl_options)
return SSLIOStream(connection, io_loop=self.io_loop, **kwargs)
def _make_client_iostream(self, connection, **kwargs):
return SSLIOStream(connection, io_loop=self.io_loop, **kwargs)
# This will run some tests that are basically redundant but it's the
# simplest way to make sure that it works to pass an SSLContext
# instead of an ssl_options dict to the SSLIOStream constructor.
@unittest.skipIf(not hasattr(ssl, 'SSLContext'), 'ssl.SSLContext not present')
class TestIOStreamSSLContext(TestIOStreamMixin, AsyncTestCase):
def _make_server_iostream(self, connection, **kwargs):
context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
context.load_cert_chain(
os.path.join(os.path.dirname(__file__), 'test.crt'),
os.path.join(os.path.dirname(__file__), 'test.key'))
connection = ssl_wrap_socket(connection, context,
server_side=True,
do_handshake_on_connect=False)
return SSLIOStream(connection, io_loop=self.io_loop, **kwargs)
def _make_client_iostream(self, connection, **kwargs):
context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
return SSLIOStream(connection, io_loop=self.io_loop,
ssl_options=context, **kwargs)
@skipIfNonUnix
class TestPipeIOStream(AsyncTestCase):
def test_pipe_iostream(self):
r, w = os.pipe()
rs = PipeIOStream(r, io_loop=self.io_loop)
ws = PipeIOStream(w, io_loop=self.io_loop)
ws.write(b"hel")
ws.write(b"lo world")
rs.read_until(b' ', callback=self.stop)
data = self.wait()
self.assertEqual(data, b"hello ")
rs.read_bytes(3, self.stop)
data = self.wait()
self.assertEqual(data, b"wor")
ws.close()
rs.read_until_close(self.stop)
data = self.wait()
self.assertEqual(data, b"ld")
rs.close()