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import socket
import subprocess
import sys
import textwrap
import unittest
from tornado import gen
from tornado.iostream import IOStream
from tornado.log import app_log
from tornado.tcpserver import TCPServer
from tornado.test.util import skipIfNonUnix
from tornado.testing import AsyncTestCase, ExpectLog, bind_unused_port, gen_test
from typing import Tuple
class TCPServerTest(AsyncTestCase):
@gen_test
def test_handle_stream_coroutine_logging(self):
# handle_stream may be a coroutine and any exception in its
# Future will be logged.
class TestServer(TCPServer):
@gen.coroutine
def handle_stream(self, stream, address):
yield stream.read_bytes(len(b"hello"))
stream.close()
1 / 0
server = client = None
try:
sock, port = bind_unused_port()
server = TestServer()
server.add_socket(sock)
client = IOStream(socket.socket())
with ExpectLog(app_log, "Exception in callback"):
yield client.connect(("localhost", port))
yield client.write(b"hello")
yield client.read_until_close()
yield gen.moment
finally:
if server is not None:
server.stop()
if client is not None:
client.close()
@gen_test
def test_handle_stream_native_coroutine(self):
# handle_stream may be a native coroutine.
class TestServer(TCPServer):
async def handle_stream(self, stream, address):
stream.write(b"data")
stream.close()
sock, port = bind_unused_port()
server = TestServer()
server.add_socket(sock)
client = IOStream(socket.socket())
yield client.connect(("localhost", port))
result = yield client.read_until_close()
self.assertEqual(result, b"data")
server.stop()
client.close()
def test_stop_twice(self):
sock, port = bind_unused_port()
server = TCPServer()
server.add_socket(sock)
server.stop()
server.stop()
@gen_test
def test_stop_in_callback(self):
# Issue #2069: calling server.stop() in a loop callback should not
# raise EBADF when the loop handles other server connection
# requests in the same loop iteration
class TestServer(TCPServer):
@gen.coroutine
def handle_stream(self, stream, address):
server.stop() # type: ignore
yield stream.read_until_close()
sock, port = bind_unused_port()
server = TestServer()
server.add_socket(sock)
server_addr = ("localhost", port)
N = 40
clients = [IOStream(socket.socket()) for i in range(N)]
connected_clients = []
@gen.coroutine
def connect(c):
try:
yield c.connect(server_addr)
except EnvironmentError:
pass
else:
connected_clients.append(c)
yield [connect(c) for c in clients]
self.assertGreater(len(connected_clients), 0, "all clients failed connecting")
try:
if len(connected_clients) == N:
# Ideally we'd make the test deterministic, but we're testing
# for a race condition in combination with the system's TCP stack...
self.skipTest(
"at least one client should fail connecting "
"for the test to be meaningful"
)
finally:
for c in connected_clients:
c.close()
# Here tearDown() would re-raise the EBADF encountered in the IO loop
@skipIfNonUnix
class TestMultiprocess(unittest.TestCase):
# These tests verify that the two multiprocess examples from the
# TCPServer docs work. Both tests start a server with three worker
# processes, each of which prints its task id to stdout (a single
# byte, so we don't have to worry about atomicity of the shared
# stdout stream) and then exits.
def run_subproc(self, code: str) -> Tuple[str, str]:
try:
result = subprocess.run(
[sys.executable, "-Werror::DeprecationWarning"],
capture_output=True,
input=code,
encoding="utf8",
check=True,
)
except subprocess.CalledProcessError as e:
raise RuntimeError(
f"Process returned {e.returncode} stdout={e.stdout} stderr={e.stderr}"
) from e
return result.stdout, result.stderr
def test_listen_single(self):
# As a sanity check, run the single-process version through this test
# harness too.
code = textwrap.dedent(
"""
import asyncio
from tornado.tcpserver import TCPServer
async def main():
server = TCPServer()
server.listen(0, address='127.0.0.1')
asyncio.run(main())
print('012', end='')
"""
)
out, err = self.run_subproc(code)
self.assertEqual("".join(sorted(out)), "012")
self.assertEqual(err, "")
def test_bind_start(self):
code = textwrap.dedent(
"""
import warnings
from tornado.ioloop import IOLoop
from tornado.process import task_id
from tornado.tcpserver import TCPServer
warnings.simplefilter("ignore", DeprecationWarning)
server = TCPServer()
server.bind(0, address='127.0.0.1')
server.start(3)
IOLoop.current().run_sync(lambda: None)
print(task_id(), end='')
"""
)
out, err = self.run_subproc(code)
self.assertEqual("".join(sorted(out)), "012")
self.assertEqual(err, "")
def test_add_sockets(self):
code = textwrap.dedent(
"""
import asyncio
from tornado.netutil import bind_sockets
from tornado.process import fork_processes, task_id
from tornado.ioloop import IOLoop
from tornado.tcpserver import TCPServer
sockets = bind_sockets(0, address='127.0.0.1')
fork_processes(3)
async def post_fork_main():
server = TCPServer()
server.add_sockets(sockets)
asyncio.run(post_fork_main())
print(task_id(), end='')
"""
)
out, err = self.run_subproc(code)
self.assertEqual("".join(sorted(out)), "012")
self.assertEqual(err, "")
def test_listen_multi_reuse_port(self):
code = textwrap.dedent(
"""
import asyncio
import socket
from tornado.netutil import bind_sockets
from tornado.process import task_id, fork_processes
from tornado.tcpserver import TCPServer
# Pick an unused port which we will be able to bind to multiple times.
(sock,) = bind_sockets(0, address='127.0.0.1',
family=socket.AF_INET, reuse_port=True)
port = sock.getsockname()[1]
fork_processes(3)
async def main():
server = TCPServer()
server.listen(port, address='127.0.0.1', reuse_port=True)
asyncio.run(main())
print(task_id(), end='')
"""
)
out, err = self.run_subproc(code)
self.assertEqual("".join(sorted(out)), "012")
self.assertEqual(err, "")
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