Add mysql-connector instrumentor support for sqlcommenting (#3163)

Author: tammy-baylis-swi

Diff for: CHANGELOG.md

@@ -51,6 +51,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   ([#3206](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3206))
 - `opentelemetry-instrumentation-pymssql` Add pymssql instrumentation
   ([#394](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/394))
+- `opentelemetry-instrumentation-mysql` Add sqlcommenter support
+  ([#3163](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/3163))
 
 ### Fixed
 

Diff for: instrumentation/opentelemetry-instrumentation-mysql/src/opentelemetry/instrumentation/mysql/__init__.py

@@ -50,6 +50,95 @@
     cursor.close()
     instrumented_cnx.close()
 
+SQLCOMMENTER
+*****************************************
+You can optionally configure mysql-connector instrumentation to enable sqlcommenter which enriches the query with contextual information.
+
+Usage
+-----
+
+.. code:: python
+
+    import mysql.connector
+    from opentelemetry.instrumentation.mysql import MySQLInstrumentor
+
+    MySQLInstrumentor().instrument(enable_commenter=True, commenter_options={})
+
+    cnx = mysql.connector.connect(database="MySQL_Database")
+    cursor = cnx.cursor()
+    cursor.execute("INSERT INTO test (testField) VALUES (123)")
+    cursor.close()
+    cnx.close()
+
+
+For example,
+::
+
+   Invoking cursor.execute("INSERT INTO test (testField) VALUES (123)") will lead to sql query "INSERT INTO test (testField) VALUES (123)" but when SQLCommenter is enabled
+   the query will get appended with some configurable tags like "INSERT INTO test (testField) VALUES (123) /*tag=value*/;"
+
+**WARNING:** sqlcommenter for mysql-connector instrumentation should NOT be used if your application initializes cursors with ``prepared=True``, which will natively prepare and execute MySQL statements. Adding sqlcommenting will introduce a severe performance penalty by repeating ``Prepare`` of statements by mysql-connector that are made unique by traceparent in sqlcomment. The penalty does not happen if cursor ``prepared=False`` (default) and instrumentor ``enable_commenter=True``.
+
+SQLCommenter Configurations
+***************************
+We can configure the tags to be appended to the sqlquery log by adding configuration inside commenter_options(default:{}) keyword
+
+db_driver = True(Default) or False
+
+For example,
+::
+Enabling this flag will add mysql.connector and its version, e.g. /*mysql.connector%%3A1.2.3*/
+
+dbapi_threadsafety = True(Default) or False
+
+For example,
+::
+Enabling this flag will add threadsafety /*dbapi_threadsafety=2*/
+
+dbapi_level = True(Default) or False
+
+For example,
+::
+Enabling this flag will add dbapi_level /*dbapi_level='2.0'*/
+
+mysql_client_version = True(Default) or False
+
+For example,
+::
+Enabling this flag will add mysql_client_version /*mysql_client_version='123'*/
+
+driver_paramstyle = True(Default) or False
+
+For example,
+::
+Enabling this flag will add driver_paramstyle /*driver_paramstyle='pyformat'*/
+
+opentelemetry_values = True(Default) or False
+
+For example,
+::
+Enabling this flag will add traceparent values /*traceparent='00-03afa25236b8cd948fa853d67038ac79-405ff022e8247c46-01'*/
+
+SQLComment in span attribute
+****************************
+If sqlcommenter is enabled, you can optionally configure mysql-connector instrumentation to append sqlcomment to query span attribute for convenience of your platform.
+
+.. code:: python
+
+    from opentelemetry.instrumentation.mysql import MySQLInstrumentor
+
+    MySQLInstrumentor().instrument(
+        enable_commenter=True,
+        enable_attribute_commenter=True,
+    )
+
+
+For example,
+::
+
+    Invoking cursor.execute("select * from auth_users") will lead to sql query "select * from auth_users" but when SQLCommenter and attribute_commenter are enabled
+    the query will get appended with some configurable tags like "select * from auth_users /*tag=value*/;" for both server query and `db.statement` span attribute.
+
 API
 ---
 """
@@ -82,6 +171,11 @@ def _instrument(self, **kwargs):
         https://dev.mysql.com/doc/connector-python/en/
         """
         tracer_provider = kwargs.get("tracer_provider")
+        enable_sqlcommenter = kwargs.get("enable_commenter", False)
+        commenter_options = kwargs.get("commenter_options", {})
+        enable_attribute_commenter = kwargs.get(
+            "enable_attribute_commenter", False
+        )
 
         dbapi.wrap_connect(
             __name__,
@@ -91,14 +185,24 @@ def _instrument(self, **kwargs):
             self._CONNECTION_ATTRIBUTES,
             version=__version__,
             tracer_provider=tracer_provider,
+            enable_commenter=enable_sqlcommenter,
+            commenter_options=commenter_options,
+            enable_attribute_commenter=enable_attribute_commenter,
         )
 
     def _uninstrument(self, **kwargs):
         """ "Disable MySQL instrumentation"""
         dbapi.unwrap_connect(mysql.connector, "connect")
 
     # pylint:disable=no-self-use
-    def instrument_connection(self, connection, tracer_provider=None):
+    def instrument_connection(
+        self,
+        connection,
+        tracer_provider=None,
+        enable_commenter=None,
+        commenter_options=None,
+        enable_attribute_commenter=None,
+    ):
         """Enable instrumentation in a MySQL connection.
 
         Args:
@@ -109,6 +213,12 @@ def instrument_connection(self, connection, tracer_provider=None):
             tracer_provider:
                 An optional `TracerProvider` instance to use for tracing. If not provided, the globally
                 configured tracer provider will be automatically used.
+            enable_commenter:
+                Optional flag to enable/disable sqlcommenter (default False).
+            commenter_options:
+                Optional configurations for tags to be appended at the sql query.
+            enable_attribute_commenter:
+                Optional flag to enable/disable addition of sqlcomment to span attribute (default False). Requires enable_commenter=True.
 
         Returns:
             An instrumented MySQL connection with OpenTelemetry tracing enabled.
@@ -120,6 +230,10 @@ def instrument_connection(self, connection, tracer_provider=None):
             self._CONNECTION_ATTRIBUTES,
             version=__version__,
             tracer_provider=tracer_provider,
+            enable_commenter=enable_commenter,
+            commenter_options=commenter_options,
+            connect_module=mysql.connector,
+            enable_attribute_commenter=enable_attribute_commenter,
         )
 
     def uninstrument_connection(self, connection):