Hotfixes: Revert `commit()` OpenTracing hackery (#11906)

synapse/storage/database.py

@@ -41,7 +41,6 @@ from prometheus_client import Histogram
 from typing_extensions import Literal
 
 from twisted.enterprise import adbapi
-from twisted.python import reflect
 
 from synapse.api.errors import StoreError
 from synapse.config.database import DatabaseConnectionConfig
@@ -91,20 +90,6 @@ UNIQUE_INDEX_BACKGROUND_UPDATES = {
 }
 
 
-class NastyConnectionWrapper:
-    def __init__(self, connection):
-        self._connection = connection
-        self._synapse_parent_context = None
-
-    def commit(self, *args, **kwargs):
-        with LoggingContext("db_commit", parent_context = self._synapse_parent_context):
-            with opentracing.start_active_span("db.conn.commit"):
-                self._connection.commit(*args, **kwargs)
-
-    def __getattr__(self, item):
-        return getattr(self._connection, item)
-
-
 def make_pool(
     reactor, db_config: DatabaseConnectionConfig, engine: BaseDatabaseEngine
 ) -> adbapi.ConnectionPool:
@@ -120,28 +105,9 @@ def make_pool(
         # etc.
         with LoggingContext("db.on_new_connection"):
             engine.on_new_connection(
-                LoggingDatabaseConnection(
-                    conn, engine, "on_new_connection"
-                )
+                LoggingDatabaseConnection(conn, engine, "on_new_connection")
             )
 
-    # HACK Patch the connection's commit function so that we can see
-    #      how long it's taking from Jaeger. To do that, we need to patch the
-    #      dbapi module's 'connect' method so that it returns a wrapped 'Connection'
-    #      object to the connection pool. (psycopg2's Connection class is a C thing
-    #      which we can't monkey-patch directly).
-    dbapiname = db_config.config["name"]
-    dbapi = reflect.namedModule(dbapiname)
-    if not getattr(dbapi, "_synapse_wrapped_dbapi", False):
-        real_connect = dbapi.connect
-
-        def wrapped_connect(*args, **kwargs):
-            conn = real_connect(*args, **kwargs)
-            return NastyConnectionWrapper(conn)
-
-        dbapi.connect = wrapped_connect
-        dbapi._synapse_wrapped_dbapi = True
-
     connection_pool = adbapi.ConnectionPool(
         db_config.config["name"],
         cp_reactor=reactor,
@@ -839,10 +805,6 @@ class DatabasePool:
             # pool).
             assert not self.engine.in_transaction(conn)
 
-            # HACK: record the parent context in 'conn' so that we can tie later commits
-            #    back to it
-            conn._connection._synapse_parent_context = parent_context
-
             with LoggingContext(
                 str(curr_context), parent_context=parent_context
             ) as context: