Lib/test/test_xmlrpc.py

import base64
import datetime
import sys
import time
import unittest
import xmlrpclib
import SimpleXMLRPCServer
import threading
import mimetools
import httplib
import socket
import StringIO
import os
import re
from test import test_support

try:
    unicode
except NameError:
    have_unicode = False
else:
    have_unicode = True

alist = [{'astring': 'foo@bar.baz.spam',
          'afloat': 7283.43,
          'anint': 2**20,
          'ashortlong': 2L,
          'anotherlist': ['.zyx.41'],
          'abase64': xmlrpclib.Binary("my dog has fleas"),
          'boolean': xmlrpclib.False,
          'unicode': u'\u4000\u6000\u8000',
          u'ukey\u4000': 'regular value',
          'datetime1': xmlrpclib.DateTime('20050210T11:41:23'),
          'datetime2': xmlrpclib.DateTime(
                        (2005, 02, 10, 11, 41, 23, 0, 1, -1)),
          'datetime3': xmlrpclib.DateTime(
                        datetime.datetime(2005, 02, 10, 11, 41, 23)),
          }]

class XMLRPCTestCase(unittest.TestCase):

    def test_dump_load(self):
        self.assertEquals(alist,
                          xmlrpclib.loads(xmlrpclib.dumps((alist,)))[0][0])

    def test_dump_bare_datetime(self):
        # This checks that an unwrapped datetime.date object can be handled
        # by the marshalling code.  This can't be done via test_dump_load()
        # since with use_datetime set to 1 the unmarshaller would create
        # datetime objects for the 'datetime[123]' keys as well
        dt = datetime.datetime(2005, 02, 10, 11, 41, 23)
        s = xmlrpclib.dumps((dt,))
        (newdt,), m = xmlrpclib.loads(s, use_datetime=1)
        self.assertEquals(newdt, dt)
        self.assertEquals(m, None)

        (newdt,), m = xmlrpclib.loads(s, use_datetime=0)
        self.assertEquals(newdt, xmlrpclib.DateTime('20050210T11:41:23'))

    def test_datetime_before_1900(self):
        # same as before but with a date before 1900
        dt = datetime.datetime(1, 02, 10, 11, 41, 23)
        s = xmlrpclib.dumps((dt,))
        (newdt,), m = xmlrpclib.loads(s, use_datetime=1)
        self.assertEquals(newdt, dt)
        self.assertEquals(m, None)

        (newdt,), m = xmlrpclib.loads(s, use_datetime=0)
        self.assertEquals(newdt, xmlrpclib.DateTime('00010210T11:41:23'))

    def test_cmp_datetime_DateTime(self):
        now = datetime.datetime.now()
        dt = xmlrpclib.DateTime(now.timetuple())
        self.assert_(dt == now)
        self.assert_(now == dt)
        then = now + datetime.timedelta(seconds=4)
        self.assert_(then >= dt)
        self.assert_(dt < then)

    def test_bug_1164912 (self):
        d = xmlrpclib.DateTime()
        ((new_d,), dummy) = xmlrpclib.loads(xmlrpclib.dumps((d,),
                                            methodresponse=True))
        self.assert_(isinstance(new_d.value, str))

        # Check that the output of dumps() is still an 8-bit string
        s = xmlrpclib.dumps((new_d,), methodresponse=True)
        self.assert_(isinstance(s, str))

    def test_newstyle_class(self):
        class T(object):
            pass
        t = T()
        t.x = 100
        t.y = "Hello"
        ((t2,), dummy) = xmlrpclib.loads(xmlrpclib.dumps((t,)))
        self.assertEquals(t2, t.__dict__)

    def test_dump_big_long(self):
        self.assertRaises(OverflowError, xmlrpclib.dumps, (2L**99,))

    def test_dump_bad_dict(self):
        self.assertRaises(TypeError, xmlrpclib.dumps, ({(1,2,3): 1},))

    def test_dump_recursive_seq(self):
        l = [1,2,3]
        t = [3,4,5,l]
        l.append(t)
        self.assertRaises(TypeError, xmlrpclib.dumps, (l,))

    def test_dump_recursive_dict(self):
        d = {'1':1, '2':1}
        t = {'3':3, 'd':d}
        d['t'] = t
        self.assertRaises(TypeError, xmlrpclib.dumps, (d,))

    def test_dump_big_int(self):
        if sys.maxint > 2L**31-1:
            self.assertRaises(OverflowError, xmlrpclib.dumps,
                              (int(2L**34),))

        xmlrpclib.dumps((xmlrpclib.MAXINT, xmlrpclib.MININT))
        self.assertRaises(OverflowError, xmlrpclib.dumps, (xmlrpclib.MAXINT+1,))
        self.assertRaises(OverflowError, xmlrpclib.dumps, (xmlrpclib.MININT-1,))

        def dummy_write(s):
            pass

        m = xmlrpclib.Marshaller()
        m.dump_int(xmlrpclib.MAXINT, dummy_write)
        m.dump_int(xmlrpclib.MININT, dummy_write)
        self.assertRaises(OverflowError, m.dump_int, xmlrpclib.MAXINT+1, dummy_write)
        self.assertRaises(OverflowError, m.dump_int, xmlrpclib.MININT-1, dummy_write)


    def test_dump_none(self):
        value = alist + [None]
        arg1 = (alist + [None],)
        strg = xmlrpclib.dumps(arg1, allow_none=True)
        self.assertEquals(value,
                          xmlrpclib.loads(strg)[0][0])
        self.assertRaises(TypeError, xmlrpclib.dumps, (arg1,))

    def test_default_encoding_issues(self):
        # SF bug #1115989: wrong decoding in '_stringify'
        utf8 = """<?xml version='1.0' encoding='iso-8859-1'?>
                  <params>
                    <param><value>
                      <string>abc \x95</string>
                      </value></param>
                    <param><value>
                      <struct>
                        <member>
                          <name>def \x96</name>
                          <value><string>ghi \x97</string></value>
                          </member>
                        </struct>
                      </value></param>
                  </params>
                  """

        # sys.setdefaultencoding() normally doesn't exist after site.py is
        # loaded.  reload(sys) is the way to get it back.
        old_encoding = sys.getdefaultencoding()
        setdefaultencoding_existed = hasattr(sys, "setdefaultencoding")
        reload(sys) # ugh!
        sys.setdefaultencoding("iso-8859-1")
        try:
            (s, d), m = xmlrpclib.loads(utf8)
        finally:
            sys.setdefaultencoding(old_encoding)
            if not setdefaultencoding_existed:
                del sys.setdefaultencoding

        items = d.items()
        if have_unicode:
            self.assertEquals(s, u"abc \x95")
            self.assert_(isinstance(s, unicode))
            self.assertEquals(items, [(u"def \x96", u"ghi \x97")])
            self.assert_(isinstance(items[0][0], unicode))
            self.assert_(isinstance(items[0][1], unicode))
        else:
            self.assertEquals(s, "abc \xc2\x95")
            self.assertEquals(items, [("def \xc2\x96", "ghi \xc2\x97")])


class HelperTestCase(unittest.TestCase):
    def test_escape(self):
        self.assertEqual(xmlrpclib.escape("a&b"), "a&amp;b")
        self.assertEqual(xmlrpclib.escape("a<b"), "a&lt;b")
        self.assertEqual(xmlrpclib.escape("a>b"), "a&gt;b")

class FaultTestCase(unittest.TestCase):
    def test_repr(self):
        f = xmlrpclib.Fault(42, 'Test Fault')
        self.assertEqual(repr(f), "<Fault 42: 'Test Fault'>")
        self.assertEqual(repr(f), str(f))

    def test_dump_fault(self):
        f = xmlrpclib.Fault(42, 'Test Fault')
        s = xmlrpclib.dumps((f,))
        (newf,), m = xmlrpclib.loads(s)
        self.assertEquals(newf, {'faultCode': 42, 'faultString': 'Test Fault'})
        self.assertEquals(m, None)

        s = xmlrpclib.Marshaller().dumps(f)
        self.assertRaises(xmlrpclib.Fault, xmlrpclib.loads, s)


class DateTimeTestCase(unittest.TestCase):
    def test_default(self):
        t = xmlrpclib.DateTime()

    def test_time(self):
        d = 1181399930.036952
        t = xmlrpclib.DateTime(d)
        self.assertEqual(str(t), time.strftime("%Y%m%dT%H:%M:%S", time.localtime(d)))

    def test_time_tuple(self):
        d = (2007,6,9,10,38,50,5,160,0)
        t = xmlrpclib.DateTime(d)
        self.assertEqual(str(t), '20070609T10:38:50')

    def test_time_struct(self):
        d = time.localtime(1181399930.036952)
        t = xmlrpclib.DateTime(d)
        self.assertEqual(str(t),  time.strftime("%Y%m%dT%H:%M:%S", d))

    def test_datetime_datetime(self):
        d = datetime.datetime(2007,1,2,3,4,5)
        t = xmlrpclib.DateTime(d)
        self.assertEqual(str(t), '20070102T03:04:05')

    def test_repr(self):
        d = datetime.datetime(2007,1,2,3,4,5)
        t = xmlrpclib.DateTime(d)
        val ="<DateTime '20070102T03:04:05' at %x>" % id(t)
        self.assertEqual(repr(t), val)

    def test_decode(self):
        d = ' 20070908T07:11:13  '
        t1 = xmlrpclib.DateTime()
        t1.decode(d)
        tref = xmlrpclib.DateTime(datetime.datetime(2007,9,8,7,11,13))
        self.assertEqual(t1, tref)

        t2 = xmlrpclib._datetime(d)
        self.assertEqual(t1, tref)

class BinaryTestCase(unittest.TestCase):
    def test_default(self):
        t = xmlrpclib.Binary()
        self.assertEqual(str(t), '')

    def test_string(self):
        d = '\x01\x02\x03abc123\xff\xfe'
        t = xmlrpclib.Binary(d)
        self.assertEqual(str(t), d)

    def test_decode(self):
        d = '\x01\x02\x03abc123\xff\xfe'
        de = base64.encodestring(d)
        t1 = xmlrpclib.Binary()
        t1.decode(de)
        self.assertEqual(str(t1), d)

        t2 = xmlrpclib._binary(de)
        self.assertEqual(str(t2), d)


ADDR = PORT = URL = None

# The evt is set twice.  First when the server is ready to serve.
# Second when the server has been shutdown.  The user must clear
# the event after it has been set the first time to catch the second set.
def http_server(evt, numrequests):
    class TestInstanceClass:
        def div(self, x, y):
            return x // y

        def _methodHelp(self, name):
            if name == 'div':
                return 'This is the div function'

    def my_function():
        '''This is my function'''
        return True

    class MyXMLRPCServer(SimpleXMLRPCServer.SimpleXMLRPCServer):
        def get_request(self):
            # Ensure the socket is always non-blocking.  On Linux, socket
            # attributes are not inherited like they are on *BSD and Windows.
            s, port = self.socket.accept()
            s.setblocking(True)
            return s, port

    serv = MyXMLRPCServer(("localhost", 0),
                          logRequests=False, bind_and_activate=False)
    try:
        serv.socket.settimeout(3)
        serv.server_bind()
        global ADDR, PORT, URL
        ADDR, PORT = serv.socket.getsockname()
        #connect to IP address directly.  This avoids socket.create_connection()
        #trying to connect to to "localhost" using all address families, which
        #causes slowdown e.g. on vista which supports AF_INET6.  The server listens
        #on AF_INET only.
        URL = "http://%s:%d"%(ADDR, PORT)
        serv.server_activate()
        serv.register_introspection_functions()
        serv.register_multicall_functions()
        serv.register_function(pow)
        serv.register_function(lambda x,y: x+y, 'add')
        serv.register_function(my_function)
        serv.register_instance(TestInstanceClass())
        evt.set()

        # handle up to 'numrequests' requests
        while numrequests > 0:
            serv.handle_request()
            numrequests -= 1

    except socket.timeout:
        pass
    finally:
        serv.socket.close()
        PORT = None
        evt.set()

# This function prevents errors like:
#    <ProtocolError for localhost:57527/RPC2: 500 Internal Server Error>
def is_unavailable_exception(e):
    '''Returns True if the given ProtocolError is the product of a server-side
       exception caused by the 'temporarily unavailable' response sometimes
       given by operations on non-blocking sockets.'''

    # sometimes we get a -1 error code and/or empty headers
    try:
        if e.errcode == -1 or e.headers is None:
            return True
        exc_mess = e.headers.get('X-exception')
    except AttributeError:
        # Ignore socket.errors here.
        exc_mess = str(e)

    if exc_mess and 'temporarily unavailable' in exc_mess.lower():
        return True

    return False

# NOTE: The tests in SimpleServerTestCase will ignore failures caused by
# "temporarily unavailable" exceptions raised in SimpleXMLRPCServer.  This
# condition occurs infrequently on some platforms, frequently on others, and
# is apparently caused by using SimpleXMLRPCServer with a non-blocking socket.
# If the server class is updated at some point in the future to handle this
# situation more gracefully, these tests should be modified appropriately.

class SimpleServerTestCase(unittest.TestCase):
    def setUp(self):
        # enable traceback reporting
        SimpleXMLRPCServer.SimpleXMLRPCServer._send_traceback_header = True

        self.evt = threading.Event()
        # start server thread to handle requests
        serv_args = (self.evt, 1)
        threading.Thread(target=http_server, args=serv_args).start()

        # wait for the server to be ready
        self.evt.wait()
        self.evt.clear()

    def tearDown(self):
        # wait on the server thread to terminate
        self.evt.wait()

        # disable traceback reporting
        SimpleXMLRPCServer.SimpleXMLRPCServer._send_traceback_header = False

    def test_simple1(self):
        try:
            p = xmlrpclib.ServerProxy(URL)
            self.assertEqual(p.pow(6,8), 6**8)
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))

    def test_nonascii(self):
        start_string = 'P\N{LATIN SMALL LETTER Y WITH CIRCUMFLEX}t'
        end_string = 'h\N{LATIN SMALL LETTER O WITH HORN}n'

        try:
            p = xmlrpclib.ServerProxy(URL)
            self.assertEqual(p.add(start_string, end_string),
                             start_string + end_string)
        except (xmlrpclib.ProtocolError, socket.error) as e:
            # ignore failures due to non-blocking socket unavailable errors.
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))


    # [ch] The test 404 is causing lots of false alarms.
    def XXXtest_404(self):
        # send POST with httplib, it should return 404 header and
        # 'Not Found' message.
        conn = httplib.HTTPConnection(ADDR, PORT)
        conn.request('POST', '/this-is-not-valid')
        response = conn.getresponse()
        conn.close()

        self.assertEqual(response.status, 404)
        self.assertEqual(response.reason, 'Not Found')

    def test_introspection1(self):
        try:
            p = xmlrpclib.ServerProxy(URL)
            meth = p.system.listMethods()
            expected_methods = set(['pow', 'div', 'my_function', 'add',
                                    'system.listMethods', 'system.methodHelp',
                                    'system.methodSignature', 'system.multicall'])
            self.assertEqual(set(meth), expected_methods)
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))

    def test_introspection2(self):
        try:
            # test _methodHelp()
            p = xmlrpclib.ServerProxy(URL)
            divhelp = p.system.methodHelp('div')
            self.assertEqual(divhelp, 'This is the div function')
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))

    def test_introspection3(self):
        try:
            # test native doc
            p = xmlrpclib.ServerProxy(URL)
            myfunction = p.system.methodHelp('my_function')
            self.assertEqual(myfunction, 'This is my function')
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))

    def test_introspection4(self):
        # the SimpleXMLRPCServer doesn't support signatures, but
        # at least check that we can try making the call
        try:
            p = xmlrpclib.ServerProxy(URL)
            divsig = p.system.methodSignature('div')
            self.assertEqual(divsig, 'signatures not supported')
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))

    def test_multicall(self):
        try:
            p = xmlrpclib.ServerProxy(URL)
            multicall = xmlrpclib.MultiCall(p)
            multicall.add(2,3)
            multicall.pow(6,8)
            multicall.div(127,42)
            add_result, pow_result, div_result = multicall()
            self.assertEqual(add_result, 2+3)
            self.assertEqual(pow_result, 6**8)
            self.assertEqual(div_result, 127//42)
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))

    def test_non_existing_multicall(self):
        try:
            p = xmlrpclib.ServerProxy(URL)
            multicall = xmlrpclib.MultiCall(p)
            multicall.this_is_not_exists()
            result = multicall()

            # result.results contains;
            # [{'faultCode': 1, 'faultString': '<type \'exceptions.Exception\'>:'
            #   'method "this_is_not_exists" is not supported'>}]

            self.assertEqual(result.results[0]['faultCode'], 1)
            self.assertEqual(result.results[0]['faultString'],
                '<type \'exceptions.Exception\'>:method "this_is_not_exists" '
                'is not supported')
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))

    def test_dotted_attribute(self):
        # Raises an AttributeError because private methods are not allowed.
        self.assertRaises(AttributeError,
                          SimpleXMLRPCServer.resolve_dotted_attribute, str, '__add')

        self.assert_(SimpleXMLRPCServer.resolve_dotted_attribute(str, 'title'))
        # Get the test to run faster by sending a request with test_simple1.
        # This avoids waiting for the socket timeout.
        self.test_simple1()

# This is a contrived way to make a failure occur on the server side
# in order to test the _send_traceback_header flag on the server
class FailingMessageClass(mimetools.Message):
    def __getitem__(self, key):
        key = key.lower()
        if key == 'content-length':
            return 'I am broken'
        return mimetools.Message.__getitem__(self, key)


class FailingServerTestCase(unittest.TestCase):
    def setUp(self):
        self.evt = threading.Event()
        # start server thread to handle requests
        serv_args = (self.evt, 1)
        threading.Thread(target=http_server, args=serv_args).start()

        # wait for the server to be ready
        self.evt.wait()
        self.evt.clear()

    def tearDown(self):
        # wait on the server thread to terminate
        self.evt.wait()
        # reset flag
        SimpleXMLRPCServer.SimpleXMLRPCServer._send_traceback_header = False
        # reset message class
        SimpleXMLRPCServer.SimpleXMLRPCRequestHandler.MessageClass = mimetools.Message

    def test_basic(self):
        # check that flag is false by default
        flagval = SimpleXMLRPCServer.SimpleXMLRPCServer._send_traceback_header
        self.assertEqual(flagval, False)

        # enable traceback reporting
        SimpleXMLRPCServer.SimpleXMLRPCServer._send_traceback_header = True

        # test a call that shouldn't fail just as a smoke test
        try:
            p = xmlrpclib.ServerProxy(URL)
            self.assertEqual(p.pow(6,8), 6**8)
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e):
                # protocol error; provide additional information in test output
                self.fail("%s\n%s" % (e, getattr(e, "headers", "")))

    def test_fail_no_info(self):
        # use the broken message class
        SimpleXMLRPCServer.SimpleXMLRPCRequestHandler.MessageClass = FailingMessageClass

        try:
            p = xmlrpclib.ServerProxy(URL)
            p.pow(6,8)
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e) and hasattr(e, "headers"):
                # The two server-side error headers shouldn't be sent back in this case
                self.assertTrue(e.headers.get("X-exception") is None)
                self.assertTrue(e.headers.get("X-traceback") is None)
        else:
            self.fail('ProtocolError not raised')

    def test_fail_with_info(self):
        # use the broken message class
        SimpleXMLRPCServer.SimpleXMLRPCRequestHandler.MessageClass = FailingMessageClass

        # Check that errors in the server send back exception/traceback
        # info when flag is set
        SimpleXMLRPCServer.SimpleXMLRPCServer._send_traceback_header = True

        try:
            p = xmlrpclib.ServerProxy(URL)
            p.pow(6,8)
        except (xmlrpclib.ProtocolError, socket.error), e:
            # ignore failures due to non-blocking socket 'unavailable' errors
            if not is_unavailable_exception(e) and hasattr(e, "headers"):
                # We should get error info in the response
                expected_err = "invalid literal for int() with base 10: 'I am broken'"
                self.assertEqual(e.headers.get("x-exception"), expected_err)
                self.assertTrue(e.headers.get("x-traceback") is not None)
        else:
            self.fail('ProtocolError not raised')

class CGIHandlerTestCase(unittest.TestCase):
    def setUp(self):
        self.cgi = SimpleXMLRPCServer.CGIXMLRPCRequestHandler()

    def tearDown(self):
        self.cgi = None

    def test_cgi_get(self):
        with test_support.EnvironmentVarGuard() as env:
            env['REQUEST_METHOD'] = 'GET'
            # if the method is GET and no request_text is given, it runs handle_get
            # get sysout output
            tmp = sys.stdout
            sys.stdout = open(test_support.TESTFN, "w")
            self.cgi.handle_request()
            sys.stdout.close()
            sys.stdout = tmp

            # parse Status header
            handle = open(test_support.TESTFN, "r").read()
            status = handle.split()[1]
            message = ' '.join(handle.split()[2:4])

            self.assertEqual(status, '400')
            self.assertEqual(message, 'Bad Request')

            os.remove(test_support.TESTFN)

    def test_cgi_xmlrpc_response(self):
        data = """<?xml version='1.0'?>
<methodCall>
    <methodName>test_method</methodName>
    <params>
        <param>
            <value><string>foo</string></value>
        </param>
        <param>
            <value><string>bar</string></value>
        </param>
     </params>
</methodCall>
"""
        open("xmldata.txt", "w").write(data)
        tmp1 = sys.stdin
        tmp2 = sys.stdout

        sys.stdin = open("xmldata.txt", "r")
        sys.stdout = open(test_support.TESTFN, "w")

        with test_support.EnvironmentVarGuard() as env:
            env['CONTENT_LENGTH'] = str(len(data))
            self.cgi.handle_request()

        sys.stdin.close()
        sys.stdout.close()
        sys.stdin = tmp1
        sys.stdout = tmp2

        # will respond exception, if so, our goal is achieved ;)
        handle = open(test_support.TESTFN, "r").read()

        # start with 44th char so as not to get http header, we just need only xml
        self.assertRaises(xmlrpclib.Fault, xmlrpclib.loads, handle[44:])

        # Also test the content-length returned  by handle_request
        # Using the same test method inorder to avoid all the datapassing
        # boilerplate code.
        # Test for bug: http://bugs.python.org/issue5040

        content = handle[handle.find("<?xml"):]

        self.assertEquals(
            int(re.search('Content-Length: (\d+)', handle).group(1)),
            len(content))


        os.remove("xmldata.txt")
        os.remove(test_support.TESTFN)

class FakeSocket:

    def __init__(self):
        self.data = StringIO.StringIO()

    def send(self, buf):
        self.data.write(buf)
        return len(buf)

    def sendall(self, buf):
        self.data.write(buf)

    def getvalue(self):
        return self.data.getvalue()

    def makefile(self, x='r', y=-1):
        raise RuntimeError

class FakeTransport(xmlrpclib.Transport):
    """A Transport instance that records instead of sending a request.

    This class replaces the actual socket used by httplib with a
    FakeSocket object that records the request.  It doesn't provide a
    response.
    """

    def make_connection(self, host):
        conn = xmlrpclib.Transport.make_connection(self, host)
        conn._conn.sock = self.fake_socket = FakeSocket()
        return conn

class TransportSubclassTestCase(unittest.TestCase):

    def issue_request(self, transport_class):
        """Return an HTTP request made via transport_class."""
        transport = transport_class()
        proxy = xmlrpclib.ServerProxy("http://example.com/",
                                      transport=transport)
        try:
            proxy.pow(6, 8)
        except RuntimeError:
            return transport.fake_socket.getvalue()
        return None

    def test_custom_user_agent(self):
        class TestTransport(FakeTransport):

            def send_user_agent(self, conn):
                xmlrpclib.Transport.send_user_agent(self, conn)
                conn.putheader("X-Test", "test_custom_user_agent")

        req = self.issue_request(TestTransport)
        self.assert_("X-Test: test_custom_user_agent\r\n" in req)

    def test_send_host(self):
        class TestTransport(FakeTransport):

            def send_host(self, conn, host):
                xmlrpclib.Transport.send_host(self, conn, host)
                conn.putheader("X-Test", "test_send_host")

        req = self.issue_request(TestTransport)
        self.assert_("X-Test: test_send_host\r\n" in req)

    def test_send_request(self):
        class TestTransport(FakeTransport):

            def send_request(self, conn, url, body):
                xmlrpclib.Transport.send_request(self, conn, url, body)
                conn.putheader("X-Test", "test_send_request")

        req = self.issue_request(TestTransport)
        self.assert_("X-Test: test_send_request\r\n" in req)

    def test_send_content(self):
        class TestTransport(FakeTransport):

            def send_content(self, conn, body):
                conn.putheader("X-Test", "test_send_content")
                xmlrpclib.Transport.send_content(self, conn, body)

        req = self.issue_request(TestTransport)
        self.assert_("X-Test: test_send_content\r\n" in req)

def test_main():
    xmlrpc_tests = [XMLRPCTestCase, HelperTestCase, DateTimeTestCase,
         BinaryTestCase, FaultTestCase, TransportSubclassTestCase]
    xmlrpc_tests.append(SimpleServerTestCase)
    xmlrpc_tests.append(FailingServerTestCase)
    xmlrpc_tests.append(CGIHandlerTestCase)

    test_support.run_unittest(*xmlrpc_tests)

if __name__ == "__main__":
    test_main()