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# Copyright (C) 2010, 2011 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
import errno
import socket
import SocketServer
import threading
from bzrlib import (
osutils,
tests,
)
from bzrlib.tests import test_server
from bzrlib.tests.scenarios import load_tests_apply_scenarios
load_tests = load_tests_apply_scenarios
class TCPClient(object):
def __init__(self):
self.sock = None
def connect(self, addr):
if self.sock is not None:
raise AssertionError('Already connected to %r'
% (self.sock.getsockname(),))
self.sock = osutils.connect_socket(addr)
def disconnect(self):
if self.sock is not None:
try:
self.sock.shutdown(socket.SHUT_RDWR)
self.sock.close()
except socket.error, e:
if e[0] in (errno.EBADF, errno.ENOTCONN):
# Right, the socket is already down
pass
else:
raise
self.sock = None
def write(self, s):
return self.sock.sendall(s)
def read(self, bufsize=4096):
return self.sock.recv(bufsize)
class TCPConnectionHandler(SocketServer.StreamRequestHandler):
def handle(self):
self.done = False
self.handle_connection()
while not self.done:
self.handle_connection()
def handle_connection(self):
req = self.rfile.readline()
if not req:
self.done = True
elif req == 'ping\n':
self.wfile.write('pong\n')
else:
raise ValueError('[%s] not understood' % req)
class TestTCPServerInAThread(tests.TestCase):
scenarios = [
(name, {'server_class': getattr(test_server, name)})
for name in
('TestingTCPServer', 'TestingThreadingTCPServer')]
# Set by load_tests()
server_class = None
def get_server(self, server_class=None, connection_handler_class=None):
if server_class is not None:
self.server_class = server_class
if connection_handler_class is None:
connection_handler_class = TCPConnectionHandler
server = test_server.TestingTCPServerInAThread(
('localhost', 0), self.server_class, connection_handler_class)
server.start_server()
self.addCleanup(server.stop_server)
return server
def get_client(self):
client = TCPClient()
self.addCleanup(client.disconnect)
return client
def get_server_connection(self, server, conn_rank):
return server.server.clients[conn_rank]
def assertClientAddr(self, client, server, conn_rank):
conn = self.get_server_connection(server, conn_rank)
self.assertEquals(client.sock.getsockname(), conn[1])
def test_start_stop(self):
server = self.get_server()
client = self.get_client()
server.stop_server()
# since the server doesn't accept connections anymore attempting to
# connect should fail
client = self.get_client()
self.assertRaises(socket.error,
client.connect, (server.host, server.port))
def test_client_talks_server_respond(self):
server = self.get_server()
client = self.get_client()
client.connect((server.host, server.port))
self.assertIs(None, client.write('ping\n'))
resp = client.read()
self.assertClientAddr(client, server, 0)
self.assertEquals('pong\n', resp)
def test_server_fails_to_start(self):
class CantStart(Exception):
pass
class CantStartServer(test_server.TestingTCPServer):
def server_bind(self):
raise CantStart()
# The exception is raised in the main thread
self.assertRaises(CantStart,
self.get_server, server_class=CantStartServer)
def test_server_fails_while_serving_or_stopping(self):
class CantConnect(Exception):
pass
class FailingConnectionHandler(TCPConnectionHandler):
def handle(self):
raise CantConnect()
server = self.get_server(
connection_handler_class=FailingConnectionHandler)
# The server won't fail until a client connect
client = self.get_client()
client.connect((server.host, server.port))
try:
# Now we must force the server to answer by sending the request and
# waiting for some answer. But since we don't control when the
# server thread will be given cycles, we don't control either
# whether our reads or writes may hang.
client.sock.settimeout(0.1)
client.write('ping\n')
client.read()
except socket.error:
pass
# Now the server has raised the exception in its own thread
self.assertRaises(CantConnect, server.stop_server)
def test_server_crash_while_responding(self):
sync = threading.Event()
sync.clear()
class FailToRespond(Exception):
pass
class FailingDuringResponseHandler(TCPConnectionHandler):
def handle_connection(self):
req = self.rfile.readline()
threading.currentThread().set_sync_event(sync)
raise FailToRespond()
server = self.get_server(
connection_handler_class=FailingDuringResponseHandler)
client = self.get_client()
client.connect((server.host, server.port))
client.write('ping\n')
sync.wait()
self.assertRaises(FailToRespond, server.pending_exception)
def test_exception_swallowed_while_serving(self):
sync = threading.Event()
sync.clear()
class CantServe(Exception):
pass
class FailingWhileServingConnectionHandler(TCPConnectionHandler):
def handle(self):
# We want to sync with the thread that is serving the
# connection.
threading.currentThread().set_sync_event(sync)
raise CantServe()
server = self.get_server(
connection_handler_class=FailingWhileServingConnectionHandler)
# Install the exception swallower
server.set_ignored_exceptions(CantServe)
client = self.get_client()
# Connect to the server so the exception is raised there
client.connect((server.host, server.port))
# Wait for the exception to propagate.
sync.wait()
# The connection wasn't served properly but the exception should have
# been swallowed.
server.pending_exception()
class TestTestingSmartServer(tests.TestCase):
def test_sets_client_timeout(self):
server = test_server.TestingSmartServer(('localhost', 0), None, None,
root_client_path='/no-such-client/path')
self.assertEqual(test_server._DEFAULT_TESTING_CLIENT_TIMEOUT,
server._client_timeout)
sock = socket.socket()
h = server._make_handler(sock)
self.assertEqual(test_server._DEFAULT_TESTING_CLIENT_TIMEOUT,
h._client_timeout)
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