# Copyright 2013 IBM Corp
#
# 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 json
from oslo_config import cfg
from oslo_log import log
import requests
from ceilometer import dispatcher
from ceilometer.i18n import _, _LE, _LW
from ceilometer.publisher import utils as publisher_utils
LOG = log.getLogger(__name__)
http_dispatcher_opts = [
cfg.StrOpt('target',
default='',
help='The target where the http request will be sent. '
'If this is not set, no data will be posted. For '
'example: target = http://hostname:1234/path'),
cfg.StrOpt('event_target',
help='The target for event data where the http request '
'will be sent to. If this is not set, it will default '
'to same as Sample target.'),
cfg.IntOpt('timeout',
default=5,
help='The max time in seconds to wait for a request to '
'timeout.'),
]
cfg.CONF.register_opts(http_dispatcher_opts, group="dispatcher_http")
[docs]class HttpDispatcher(dispatcher.MeterDispatcherBase,
dispatcher.EventDispatcherBase):
"""Dispatcher class for posting metering/event data into a http target.
To enable this dispatcher, the following option needs to be present in
ceilometer.conf file::
[DEFAULT]
meter_dispatchers = http
event_dispatchers = http
Dispatcher specific options can be added as follows::
[dispatcher_http]
target = www.example.com
event_target = www.example.com
timeout = 2
"""
def __init__(self, conf):
super(HttpDispatcher, self).__init__(conf)
self.headers = {'Content-type': 'application/json'}
self.timeout = self.conf.dispatcher_http.timeout
self.target = self.conf.dispatcher_http.target
self.event_target = (self.conf.dispatcher_http.event_target or
self.target)
[docs] def record_metering_data(self, data):
if self.target == '':
# if the target was not set, do not do anything
LOG.error(_('Dispatcher target was not set, no meter will '
'be posted. Set the target in the ceilometer.conf '
'file'))
return
# We may have receive only one counter on the wire
if not isinstance(data, list):
data = [data]
for meter in data:
LOG.debug(
'metering data %(counter_name)s '
'for %(resource_id)s @ %(timestamp)s: %(counter_volume)s',
{'counter_name': meter['counter_name'],
'resource_id': meter['resource_id'],
'timestamp': meter.get('timestamp', 'NO TIMESTAMP'),
'counter_volume': meter['counter_volume']})
if publisher_utils.verify_signature(
meter, self.conf.publisher.telemetry_secret):
try:
# Every meter should be posted to the target
res = requests.post(self.target,
data=json.dumps(meter),
headers=self.headers,
timeout=self.timeout)
LOG.debug('Message posting finished with status code '
'%d.', res.status_code)
except Exception as err:
LOG.exception(_('Failed to record metering data: %s'),
err)
else:
LOG.warning(_(
'message signature invalid, discarding message: %r'),
meter)
[docs] def record_events(self, events):
if not isinstance(events, list):
events = [events]
for event in events:
if publisher_utils.verify_signature(
event, self.conf.publisher.telemetry_secret):
res = None
try:
res = requests.post(self.event_target, data=event,
headers=self.headers,
timeout=self.timeout)
res.raise_for_status()
except Exception:
error_code = res.status_code if res else 'unknown'
LOG.exception(_LE('Status Code: %{code}s. Failed to'
'dispatch event: %{event}s'),
{'code': error_code, 'event': event})
else:
LOG.warning(_LW(
'event signature invalid, discarding event: %s'), event)