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# Copyright 2014 Mirantis Inc.
# All Rights Reserved.
#
# 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.
from osprofiler import profiler
def before_execute(name):
"""Add listener that will send trace info before query is executed."""
def handler(conn, clauseelement, multiparams, params):
info = {"db.statement": str(clauseelement),
"db.multiparams": str(multiparams),
"db.params": str(params)}
profiler.start(name, info=info)
return handler
def after_execute():
"""Add listener that will send trace info after query is executed."""
def handler(conn, clauseelement, multiparams, params, result):
profiler.stop(info=None)
return handler
_DISABLED = False
def disable():
"""add_tracing does not add event listeners for sqlalchemy.
This is quite important in case of sql migrations. Because it's not allowed
to add these events.
"""
global _DISABLED
_DISABLED = True
def enable():
"""add_tracing adds event listeners for sqlalchemy."""
global _DISABLED
_DISABLED = False
def add_tracing(sqlalchemy, engine, name):
"""Add tracing to all sqlalchemy calls."""
if not _DISABLED:
sqlalchemy.event.listen(engine, 'before_execute', before_execute(name))
sqlalchemy.event.listen(engine, 'after_execute', after_execute())
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