blob: 9788c0d2661c6a53c0b9ebf5d8e00b1156800060 [file] [log] [blame]
# Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Class for tracking a few monitoring statistics.
This class allows time-based stats to be queried and updated into a local
db (json file) to track and notice unexpected trends in database data.
The initial example is to periodically record the count of the django_session
table over time and graph it to notice unexpected spikes.
Includes: class MonitoringView(object)
import json
import os
MONITORING_DB_FILE = "monitoring_db.json"
class MonitoringView(object):
"""View used to show monitoring information in summary views.
Initially, this will be used to watch for specific undesirable activities
in the database. Perhaps this will get re-abstracted into something more
def __init__(self, dash_base_dir):
"""Retrieve the contents of the current monitoring db file.
No locking protects this file.
Monitoring File should be of the following format:
"django_session": [{"time": "Wed Jun 6 10:33:02 PDT 2012",
"sessions": 170},
{"time": "Wed Jun 6 13:14:47 PDT 2012",
"sessions": 52422}, ...]
self._monitoring_path = os.path.join(dash_base_dir, MONITORING_DB_FILE)
if not os.path.exists(self._monitoring_path):
self.monitoring_db = {'django_session': []}
self.monitoring_db = json.load(open(self._monitoring_path))
def UpdateMonitoringDB(self, db_key, updated_value_dict):
"""Add a newly retrieved data value to the in-memory db."""
def WriteMonitoringDB(self):
"""Write the updated monitoring db file.
Not protected by locking code.
with open(self._monitoring_path, 'w') as f: