Catch socket errors that are often the cause of transient failures.

Many of these exceptions are due to resource unavailable, so the
existing code should be able to handle many more spurious errors.

Lib/test/test_xmlrpc.py

@@ -389,7 +389,7 @@ class SimpleServerTestCase(unittest.TestCase):
         try:
             p = xmlrpclib.ServerProxy('http://localhost:%d' % PORT)
             self.assertEqual(p.pow(6,8), 6**8)
-        except xmlrpclib.ProtocolError, e:
+        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
@@ -415,7 +415,7 @@ class SimpleServerTestCase(unittest.TestCase):
                                     'system.listMethods', 'system.methodHelp',
                                     'system.methodSignature', 'system.multicall'])
             self.assertEqual(set(meth), expected_methods)
-        except xmlrpclib.ProtocolError, e:
+        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
@@ -427,7 +427,7 @@ class SimpleServerTestCase(unittest.TestCase):
             p = xmlrpclib.ServerProxy('http://localhost:%d' % PORT)
             divhelp = p.system.methodHelp('div')
             self.assertEqual(divhelp, 'This is the div function')
-        except xmlrpclib.ProtocolError, e:
+        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
@@ -439,7 +439,7 @@ class SimpleServerTestCase(unittest.TestCase):
             p = xmlrpclib.ServerProxy('http://localhost:%d' % PORT)
             myfunction = p.system.methodHelp('my_function')
             self.assertEqual(myfunction, 'This is my function')
-        except xmlrpclib.ProtocolError, e:
+        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
@@ -452,7 +452,7 @@ class SimpleServerTestCase(unittest.TestCase):
             p = xmlrpclib.ServerProxy('http://localhost:%d' % PORT)
             divsig = p.system.methodSignature('div')
             self.assertEqual(divsig, 'signatures not supported')
-        except xmlrpclib.ProtocolError, e:
+        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
@@ -469,7 +469,7 @@ class SimpleServerTestCase(unittest.TestCase):
             self.assertEqual(add_result, 2+3)
             self.assertEqual(pow_result, 6**8)
             self.assertEqual(div_result, 127//42)
-        except xmlrpclib.ProtocolError, e:
+        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
@@ -490,7 +490,7 @@ class SimpleServerTestCase(unittest.TestCase):
             self.assertEqual(result.results[0]['faultString'],
                 '<type \'exceptions.Exception\'>:method "this_is_not_exists" '
                 'is not supported')
-        except xmlrpclib.ProtocolError, e:
+        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
@@ -545,7 +545,7 @@ class FailingServerTestCase(unittest.TestCase):
         try:
             p = xmlrpclib.ServerProxy('http://localhost:%d' % PORT)
             self.assertEqual(p.pow(6,8), 6**8)
-        except xmlrpclib.ProtocolError, e:
+        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
@@ -558,7 +558,7 @@ class FailingServerTestCase(unittest.TestCase):
         try:
             p = xmlrpclib.ServerProxy('http://localhost:%d' % PORT)
             p.pow(6,8)
-        except xmlrpclib.ProtocolError, e:
+        except (xmlrpclib.ProtocolError, socket.error), e:
             # ignore failures due to non-blocking socket 'unavailable' errors
             if not is_unavailable_exception(e):
                 # The two server-side error headers shouldn't be sent back in this case
@@ -578,7 +578,7 @@ class FailingServerTestCase(unittest.TestCase):
         try:
             p = xmlrpclib.ServerProxy('http://localhost:%d' % PORT)
             p.pow(6,8)
-        except xmlrpclib.ProtocolError, e:
+        except (xmlrpclib.ProtocolError, socket.error), e:
             # ignore failures due to non-blocking socket 'unavailable' errors
             if not is_unavailable_exception(e):
                 # We should get error info in the response