log.py
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# Copyright (c) 2014 Mitch Garnaat http://garnaat.org/
#
# 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
from botocore.exceptions import ClientError
import kappa.aws
LOG = logging.getLogger(__name__)
class Log(object):
def __init__(self, context, log_group_name):
self._context = context
self.log_group_name = log_group_name
aws = kappa.aws.get_aws(self._context)
self._log_svc = aws.create_client('logs')
def _check_for_log_group(self):
LOG.debug('checking for log group')
response = self._log_svc.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_svc.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_svc.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_svc.delete_log_group(
logGroupName=self.log_group_name)
LOG.debug(response)
except ClientError:
LOG.debug('unable to delete log group')