Refactor TracedConnectionProxy (#1097)

* Refactor TracedConnectionProxy

Fixes #1077

* Remove unecessary methods

instrumentation/opentelemetry-instrumentation-dbapi/src/opentelemetry/instrumentation/dbapi/__init__.py

@@ -214,8 +214,8 @@ def uninstrument_connection(connection):
     Returns:
         An uninstrumented connection.
     """
-    if isinstance(connection, wrapt.ObjectProxy):
+    if isinstance(connection, _TracedConnectionProxy):
-        return connection.__wrapped__
+        return connection._connection
 
     _logger.warning("Connection is not instrumented")
     return connection
@@ -300,28 +300,35 @@ class DatabaseApiIntegration:
             self.span_attributes[SpanAttributes.NET_PEER_PORT] = port
 
 
+class _TracedConnectionProxy:
+    pass
+
+
 def get_traced_connection_proxy(
     connection, db_api_integration, *args, **kwargs
 ):
     # pylint: disable=abstract-method
-    class TracedConnectionProxy(wrapt.ObjectProxy):
+    class TracedConnectionProxy(type(connection), _TracedConnectionProxy):
-        # pylint: disable=unused-argument
+        def __init__(self, connection):
-        def __init__(self, connection, *args, **kwargs):
+            self._connection = connection
-            wrapt.ObjectProxy.__init__(self, connection)
+
+        def __getattr__(self, name):
+            return object.__getattribute__(
+                object.__getattribute__(self, "_connection"), name
+            )
 
         def cursor(self, *args, **kwargs):
             return get_traced_cursor_proxy(
-                self.__wrapped__.cursor(*args, **kwargs), db_api_integration
+                self._connection.cursor(*args, **kwargs), db_api_integration
             )
 
-        def __enter__(self):
+        # For some reason this is necessary as trying to access the close
-            self.__wrapped__.__enter__()
+        # method of self._connection via __getattr__ leads to unexplained
-            return self
+        # errors.
+        def close(self):
+            self._connection.close()
 
-        def __exit__(self, *args, **kwargs):
+    return TracedConnectionProxy(connection)
-            self.__wrapped__.__exit__(*args, **kwargs)
-
-    return TracedConnectionProxy(connection, *args, **kwargs)
 
 
 class CursorTracer:

instrumentation/opentelemetry-instrumentation-dbapi/tests/test_dbapi_integration.py

@@ -262,14 +262,14 @@ class TestDBApiIntegration(TestBase):
 
     @mock.patch("opentelemetry.instrumentation.dbapi")
     def test_wrap_connect(self, mock_dbapi):
-        dbapi.wrap_connect(self.tracer, mock_dbapi, "connect", "-")
+        dbapi.wrap_connect(self.tracer, MockConnectionEmpty(), "connect", "-")
         connection = mock_dbapi.connect()
         self.assertEqual(mock_dbapi.connect.call_count, 1)
-        self.assertIsInstance(connection.__wrapped__, mock.Mock)
+        self.assertIsInstance(connection._connection, mock.Mock)
 
     @mock.patch("opentelemetry.instrumentation.dbapi")
     def test_unwrap_connect(self, mock_dbapi):
-        dbapi.wrap_connect(self.tracer, mock_dbapi, "connect", "-")
+        dbapi.wrap_connect(self.tracer, MockConnectionEmpty(), "connect", "-")
         connection = mock_dbapi.connect()
         self.assertEqual(mock_dbapi.connect.call_count, 1)
 
@@ -279,19 +279,21 @@ class TestDBApiIntegration(TestBase):
         self.assertIsInstance(connection, mock.Mock)
 
     def test_instrument_connection(self):
-        connection = mock.Mock()
+        connection = MockConnectionEmpty()
         # Avoid get_attributes failing because can't concatenate mock
+        # pylint: disable=attribute-defined-outside-init
         connection.database = "-"
         connection2 = dbapi.instrument_connection(self.tracer, connection, "-")
-        self.assertIs(connection2.__wrapped__, connection)
+        self.assertIs(connection2._connection, connection)
 
     def test_uninstrument_connection(self):
-        connection = mock.Mock()
+        connection = MockConnectionEmpty()
         # Set connection.database to avoid a failure because mock can't
         # be concatenated
+        # pylint: disable=attribute-defined-outside-init
         connection.database = "-"
         connection2 = dbapi.instrument_connection(self.tracer, connection, "-")
-        self.assertIs(connection2.__wrapped__, connection)
+        self.assertIs(connection2._connection, connection)
 
         connection3 = dbapi.uninstrument_connection(connection2)
         self.assertIs(connection3, connection)
@@ -307,10 +309,12 @@ def mock_connect(*args, **kwargs):
     server_host = kwargs.get("server_host")
     server_port = kwargs.get("server_port")
     user = kwargs.get("user")
-    return MockConnection(database, server_port, server_host, user)
+    return MockConnectionWithAttributes(
+        database, server_port, server_host, user
+    )
 
 
-class MockConnection:
+class MockConnectionWithAttributes:
     def __init__(self, database, server_port, server_host, user):
         self.database = database
         self.server_port = server_port
@@ -343,3 +347,7 @@ class MockCursor:
     def callproc(self, query, params=None, throw_exception=False):
         if throw_exception:
             raise Exception("Test Exception")
+
+
+class MockConnectionEmpty:
+    pass

instrumentation/opentelemetry-instrumentation-mysql/tests/test_mysql_integration.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from unittest import mock
+from unittest.mock import Mock, patch
 
 import mysql.connector
 
@@ -22,15 +22,24 @@ from opentelemetry.sdk import resources
 from opentelemetry.test.test_base import TestBase
 
 
+def mock_connect(*args, **kwargs):
+    class MockConnection:
+        def cursor(self):
+            # pylint: disable=no-self-use
+            return Mock()
+
+    return MockConnection()
+
+
 class TestMysqlIntegration(TestBase):
     def tearDown(self):
         super().tearDown()
         with self.disable_logging():
             MySQLInstrumentor().uninstrument()
 
-    @mock.patch("mysql.connector.connect")
+    @patch("mysql.connector.connect", new=mock_connect)
     # pylint: disable=unused-argument
-    def test_instrumentor(self, mock_connect):
+    def test_instrumentor(self):
         MySQLInstrumentor().instrument()
 
         cnx = mysql.connector.connect(database="test")
@@ -58,9 +67,8 @@ class TestMysqlIntegration(TestBase):
         spans_list = self.memory_exporter.get_finished_spans()
         self.assertEqual(len(spans_list), 1)
 
-    @mock.patch("mysql.connector.connect")
+    @patch("mysql.connector.connect", new=mock_connect)
-    # pylint: disable=unused-argument
+    def test_custom_tracer_provider(self):
-    def test_custom_tracer_provider(self, mock_connect):
         resource = resources.Resource.create({})
         result = self.create_tracer_provider(resource=resource)
         tracer_provider, exporter = result
@@ -77,9 +85,9 @@ class TestMysqlIntegration(TestBase):
 
         self.assertIs(span.resource, resource)
 
-    @mock.patch("mysql.connector.connect")
+    @patch("mysql.connector.connect", new=mock_connect)
     # pylint: disable=unused-argument
-    def test_instrument_connection(self, mock_connect):
+    def test_instrument_connection(self):
         cnx = mysql.connector.connect(database="test")
         query = "SELECT * FROM test"
         cursor = cnx.cursor()
@@ -95,9 +103,9 @@ class TestMysqlIntegration(TestBase):
         spans_list = self.memory_exporter.get_finished_spans()
         self.assertEqual(len(spans_list), 1)
 
-    @mock.patch("mysql.connector.connect")
+    @patch("mysql.connector.connect", new=mock_connect)
     # pylint: disable=unused-argument
-    def test_uninstrument_connection(self, mock_connect):
+    def test_uninstrument_connection(self):
         MySQLInstrumentor().instrument()
         cnx = mysql.connector.connect(database="test")
         query = "SELECT * FROM test"

instrumentation/opentelemetry-instrumentation-pymysql/tests/test_pymysql_integration.py

@@ -12,7 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from unittest import mock
+from unittest.mock import Mock, patch
 
 import pymysql
 
@@ -22,15 +22,24 @@ from opentelemetry.sdk import resources
 from opentelemetry.test.test_base import TestBase
 
 
+def mock_connect(*args, **kwargs):
+    class MockConnection:
+        def cursor(self):
+            # pylint: disable=no-self-use
+            return Mock()
+
+    return MockConnection()
+
+
 class TestPyMysqlIntegration(TestBase):
     def tearDown(self):
         super().tearDown()
         with self.disable_logging():
             PyMySQLInstrumentor().uninstrument()
 
-    @mock.patch("pymysql.connect")
+    @patch("pymysql.connect", new=mock_connect)
     # pylint: disable=unused-argument
-    def test_instrumentor(self, mock_connect):
+    def test_instrumentor(self):
         PyMySQLInstrumentor().instrument()
 
         cnx = pymysql.connect(database="test")
@@ -58,9 +67,9 @@ class TestPyMysqlIntegration(TestBase):
         spans_list = self.memory_exporter.get_finished_spans()
         self.assertEqual(len(spans_list), 1)
 
-    @mock.patch("pymysql.connect")
+    @patch("pymysql.connect", new=mock_connect)
     # pylint: disable=unused-argument
-    def test_custom_tracer_provider(self, mock_connect):
+    def test_custom_tracer_provider(self):
         resource = resources.Resource.create({})
         result = self.create_tracer_provider(resource=resource)
         tracer_provider, exporter = result
@@ -78,9 +87,9 @@ class TestPyMysqlIntegration(TestBase):
 
         self.assertIs(span.resource, resource)
 
-    @mock.patch("pymysql.connect")
+    @patch("pymysql.connect", new=mock_connect)
     # pylint: disable=unused-argument
-    def test_instrument_connection(self, mock_connect):
+    def test_instrument_connection(self):
         cnx = pymysql.connect(database="test")
         query = "SELECT * FROM test"
         cursor = cnx.cursor()
@@ -96,9 +105,9 @@ class TestPyMysqlIntegration(TestBase):
         spans_list = self.memory_exporter.get_finished_spans()
         self.assertEqual(len(spans_list), 1)
 
-    @mock.patch("pymysql.connect")
+    @patch("pymysql.connect", new=mock_connect)
     # pylint: disable=unused-argument
-    def test_uninstrument_connection(self, mock_connect):
+    def test_uninstrument_connection(self):
         PyMySQLInstrumentor().instrument()
         cnx = pymysql.connect(database="test")
         query = "SELECT * FROM test"