1 files changed, 145 insertions, 0 deletions
diff --git a/src/python/grpcio_tests/tests/unit/_session_cache_test.py b/src/python/grpcio_tests/tests/unit/_session_cache_test.py
new file mode 100644
index 0000000000..b4e4670fa7
--- /dev/null
+++ b/src/python/grpcio_tests/tests/unit/_session_cache_test.py
@@ -0,0 +1,145 @@
+# Copyright 2018 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Tests experimental TLS Session Resumption API"""
+
+import pickle
+import unittest
+
+import grpc
+from grpc import _channel
+from grpc.experimental import session_cache
+
+from tests.unit import test_common
+from tests.unit import resources
+
+_REQUEST = b'\x00\x00\x00'
+_RESPONSE = b'\x00\x00\x00'
+
+_UNARY_UNARY = '/test/UnaryUnary'
+
+_SERVER_HOST_OVERRIDE = 'foo.test.google.fr'
+_ID = 'id'
+_ID_KEY = 'id_key'
+_AUTH_CTX = 'auth_ctx'
+
+_PRIVATE_KEY = resources.private_key()
+_CERTIFICATE_CHAIN = resources.certificate_chain()
+_TEST_ROOT_CERTIFICATES = resources.test_root_certificates()
+_SERVER_CERTS = ((_PRIVATE_KEY, _CERTIFICATE_CHAIN),)
+_PROPERTY_OPTIONS = ((
+    'grpc.ssl_target_name_override',
+    _SERVER_HOST_OVERRIDE,
+),)
+
+
+def handle_unary_unary(request, servicer_context):
+    return pickle.dumps({
+        _ID: servicer_context.peer_identities(),
+        _ID_KEY: servicer_context.peer_identity_key(),
+        _AUTH_CTX: servicer_context.auth_context()
+    })
+
+
+def start_secure_server():
+    handler = grpc.method_handlers_generic_handler('test', {
+        'UnaryUnary':
+        grpc.unary_unary_rpc_method_handler(handle_unary_unary)
+    })
+    server = test_common.test_server()
+    server.add_generic_rpc_handlers((handler,))
+    server_cred = grpc.ssl_server_credentials(_SERVER_CERTS)
+    port = server.add_secure_port('[::]:0', server_cred)
+    server.start()
+
+    return server, port
+
+
+class SSLSessionCacheTest(unittest.TestCase):
+
+    def _do_one_shot_client_rpc(self, channel_creds, channel_options, port,
+                                expect_ssl_session_reused):
+        channel = grpc.secure_channel(
+            'localhost:{}'.format(port), channel_creds, options=channel_options)
+        response = channel.unary_unary(_UNARY_UNARY)(_REQUEST)
+        auth_data = pickle.loads(response)
+        self.assertEqual(expect_ssl_session_reused,
+                         auth_data[_AUTH_CTX]['ssl_session_reused'])
+        channel.close()
+
+    def testSSLSessionCacheLRU(self):
+        server_1, port_1 = start_secure_server()
+
+        cache = session_cache.ssl_session_cache_lru(1)
+        channel_creds = grpc.ssl_channel_credentials(
+            root_certificates=_TEST_ROOT_CERTIFICATES)
+        channel_options = _PROPERTY_OPTIONS + (
+            ('grpc.ssl_session_cache', cache),)
+
+        # Initial connection has no session to resume
+        self._do_one_shot_client_rpc(
+            channel_creds,
+            channel_options,
+            port_1,
+            expect_ssl_session_reused=[b'false'])
+
+        # Connection to server_1 resumes from initial session
+        self._do_one_shot_client_rpc(
+            channel_creds,
+            channel_options,
+            port_1,
+            expect_ssl_session_reused=[b'true'])
+
+        # Connection to a different server with the same name overwrites the cache entry
+        server_2, port_2 = start_secure_server()
+        self._do_one_shot_client_rpc(
+            channel_creds,
+            channel_options,
+            port_2,
+            expect_ssl_session_reused=[b'false'])
+        self._do_one_shot_client_rpc(
+            channel_creds,
+            channel_options,
+            port_2,
+            expect_ssl_session_reused=[b'true'])
+        server_2.stop(None)
+
+        # Connection to server_1 now falls back to full TLS handshake
+        self._do_one_shot_client_rpc(
+            channel_creds,
+            channel_options,
+            port_1,
+            expect_ssl_session_reused=[b'false'])
+
+        # Re-creating server_1 causes old sessions to become invalid
+        server_1.stop(None)
+        server_1, port_1 = start_secure_server()
+
+        # Old sessions should no longer be valid
+        self._do_one_shot_client_rpc(
+            channel_creds,
+            channel_options,
+            port_1,
+            expect_ssl_session_reused=[b'false'])
+
+        # Resumption should work for subsequent connections
+        self._do_one_shot_client_rpc(
+            channel_creds,
+            channel_options,
+            port_1,
+            expect_ssl_session_reused=[b'true'])
+        server_1.stop(None)
+
+
+if __name__ == '__main__':
+    unittest.main(verbosity=2)