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# Copyright 2017 Amazon.com, Inc. or its affiliates. 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. A copy of
# the License is located at
#
# http://aws.amazon.com/apache2.0/
#
# or in the "license" file accompanying this file. This file 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.
import logging
HISTORY_RECORDER = None
logger = logging.getLogger(__name__)
class BaseHistoryHandler(object):
def emit(self, event_type, payload, source):
raise NotImplementedError('emit()')
class HistoryRecorder(object):
def __init__(self):
self._enabled = False
self._handlers = []
def enable(self):
self._enabled = True
def disable(self):
self._enabled = False
def add_handler(self, handler):
self._handlers.append(handler)
def record(self, event_type, payload, source='BOTOCORE'):
if self._enabled and self._handlers:
for handler in self._handlers:
try:
handler.emit(event_type, payload, source)
except Exception:
# Never let the process die because we had a failure in
# a record collection handler.
logger.debug("Exception raised in %s.", handler,
exc_info=True)
def get_global_history_recorder():
global HISTORY_RECORDER
if HISTORY_RECORDER is None:
HISTORY_RECORDER = HistoryRecorder()
return HISTORY_RECORDER
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