73c9150afe
Implement a Counter class for use by notification plugins. Define a base class for Notification plugins. Define a dispatcher class for notification events to be passed to the plugins. Add a notification plugin for instance creation and "instance" counters. Add a reusable function for turning a Counter into a metering event dictionary. Change-Id: Iaa626b98e1a661ed31cc8b8e95263c111df20888
63 lines
2.1 KiB
Python
63 lines
2.1 KiB
Python
# -*- encoding: utf-8 -*-
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#
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# Copyright © 2012 New Dream Network, LLC (DreamHost)
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#
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# Author: Doug Hellmann <doug.hellmann@dreamhost.com>
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Compute the signature of a metering message.
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"""
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import hmac
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import hashlib
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import uuid
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# FIXME(dhellmann): Need to move this secret out of the code. Where?
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SECRET = 'secrete'
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def compute_signature(message):
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"""Return the signature for a message dictionary.
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"""
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digest_maker = hmac.new(SECRET, '', hashlib.sha256)
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for name, value in sorted(message.iteritems()):
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if name == 'message_signature':
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# Skip any existing signature value, which would not have
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# been part of the original message.
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continue
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digest_maker.update(name)
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digest_maker.update(unicode(value).encode('utf-8'))
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return digest_maker.hexdigest()
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def meter_message_from_counter(notice, counter):
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"""Make a metering message ready to be published or stored.
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Returns a dictionary containing a metering message
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for a notification message and a Counter instance.
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"""
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msg = {'source': counter.source,
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'counter_type': counter.type,
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'counter_volume': counter.volume,
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'user_id': notice['payload']['user_id'],
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'project_id': notice['payload']['tenant_id'],
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'resource_id': counter.resource_id,
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'counter_datetime': counter.datetime,
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'counter_duration': counter.duration,
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'resource_metadata': counter.resource_metadata,
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'message_id': str(uuid.uuid1()),
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}
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msg['message_signature'] = compute_signature(msg)
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return msg
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