log.py
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# Copyright (c) 2014, 2015 Mitch Garnaat
#
# 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.
import logging
from botocore.exceptions import ClientError
import kappa.awsclient
LOG = logging.getLogger(__name__)
class Log(object):
def __init__(self, context, log_group_name):
self._context = context
self.log_group_name = log_group_name
self._log_client = kappa.awsclient.create_client('logs', context)
def _check_for_log_group(self):
LOG.debug('checking for log group')
response = self._log_client.call('describe_log_groups')
log_group_names = [lg['logGroupName'] for lg in response['logGroups']]
return self.log_group_name in log_group_names
def streams(self):
LOG.debug('getting streams for log group: %s', self.log_group_name)
if not self._check_for_log_group():
LOG.info(
'log group %s has not been created yet', self.log_group_name)
return []
response = self._log_client.call(
'describe_log_streams',
logGroupName=self.log_group_name)
LOG.debug(response)
return response['logStreams']
def tail(self):
LOG.debug('tailing log group: %s', self.log_group_name)
if not self._check_for_log_group():
LOG.info(
'log group %s has not been created yet', self.log_group_name)
return []
latest_stream = None
streams = self.streams()
for stream in streams:
if not latest_stream:
latest_stream = stream
elif stream['lastEventTimestamp'] > latest_stream['lastEventTimestamp']:
latest_stream = stream
response = self._log_client.call(
'get_log_events',
logGroupName=self.log_group_name,
logStreamName=latest_stream['logStreamName'])
LOG.debug(response)
return response['events']
def delete(self):
try:
response = self._log_client.call(
'delete_log_group',
logGroupName=self.log_group_name)
LOG.debug(response)
except ClientError:
LOG.debug('unable to delete log group')