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#!/usr/bin/env python
#
# Copyright 2012 eNovance <licensing@enovance.com>
#
# Author: Julien Danjou <julien@danjou.info>
#
# 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.
"""
Ceilometer Middleware for Swift Proxy
Configuration:
In /etc/swift/proxy-server.conf on the main pipeline add "ceilometer" just
before "proxy-server" and add the following filter in the file:
.. code-block:: python
[filter:ceilometer]
use = egg:ceilometer#swift
# Some optional configuration
# this allow to publish additional metadata
metadata_headers = X-TEST
# Set reseller prefix (defaults to "AUTH_" if not set)
reseller_prefix = AUTH_
"""
from __future__ import absolute_import
from ceilometer.openstack.common import context
from ceilometer.openstack.common import log
from ceilometer.openstack.common import timeutils
from ceilometer import pipeline
from ceilometer import sample
from ceilometer import service
LOG = log.getLogger(__name__)
class InputProxy(object):
"""File-like object that counts bytes read.
To be swapped in for wsgi.input for accounting purposes.
Borrowed from swift.common.utils. Duplidated here to avoid
dependency on swift package.
"""
def __init__(self, wsgi_input):
self.wsgi_input = wsgi_input
self.bytes_received = 0
def read(self, *args, **kwargs):
"""Pass read request to the underlying file-like object
Add bytes read to total.
"""
chunk = self.wsgi_input.read(*args, **kwargs)
self.bytes_received += len(chunk)
return chunk
def readline(self, *args, **kwargs):
"""Pass readline request to the underlying file-like object
Add bytes read to total.
"""
line = self.wsgi_input.readline(*args, **kwargs)
self.bytes_received += len(line)
return line
class CeilometerMiddleware(object):
"""Ceilometer middleware used for counting requests."""
def __init__(self, app, conf):
self.app = app
self.metadata_headers = [h.strip().replace('-', '_').lower()
for h in conf.get(
"metadata_headers",
"").split(",") if h.strip()]
service.prepare_service([])
self.pipeline_manager = pipeline.setup_pipeline()
self.reseller_prefix = conf.get('reseller_prefix', 'AUTH_')
if self.reseller_prefix and self.reseller_prefix[-1] != '_':
self.reseller_prefix += '_'
def __call__(self, env, start_response):
start_response_args = [None]
input_proxy = InputProxy(env['wsgi.input'])
env['wsgi.input'] = input_proxy
def my_start_response(status, headers, exc_info=None):
start_response_args[0] = (status, list(headers), exc_info)
def iter_response(iterable):
iterator = iter(iterable)
try:
chunk = next(iterator)
while not chunk:
chunk = next(iterator)
except StopIteration:
chunk = ''
if start_response_args[0]:
start_response(*start_response_args[0])
bytes_sent = 0
try:
while chunk:
bytes_sent += len(chunk)
yield chunk
chunk = next(iterator)
finally:
try:
self.publish_sample(env,
input_proxy.bytes_received,
bytes_sent)
except Exception:
LOG.exception('Failed to publish samples')
try:
iterable = self.app(env, my_start_response)
except Exception:
self.publish_sample(env, input_proxy.bytes_received, 0)
raise
else:
return iter_response(iterable)
def publish_sample(self, env, bytes_received, bytes_sent):
path = env['PATH_INFO']
method = env['REQUEST_METHOD']
headers = dict((header.strip('HTTP_'), env[header]) for header
in env if header.startswith('HTTP_'))
try:
container = obj = None
version, account, remainder = path.replace(
'/', '', 1).split('/', 2)
if not version or not account:
raise ValueError('Invalid path: %s' % path)
if remainder:
if '/' in remainder:
container, obj = remainder.split('/', 1)
else:
container = remainder
except ValueError:
return
now = timeutils.utcnow().isoformat()
resource_metadata = {
"path": path,
"version": version,
"container": container,
"object": obj,
}
for header in self.metadata_headers:
if header.upper() in headers:
resource_metadata['http_header_%s' % header] = headers.get(
header.upper())
with self.pipeline_manager.publisher(
context.get_admin_context()) as publisher:
if bytes_received:
publisher([sample.Sample(
name='storage.objects.incoming.bytes',
type=sample.TYPE_DELTA,
unit='B',
volume=bytes_received,
user_id=env.get('HTTP_X_USER_ID'),
project_id=env.get('HTTP_X_TENANT_ID'),
resource_id=account.partition(self.reseller_prefix)[2],
timestamp=now,
resource_metadata=resource_metadata)])
if bytes_sent:
publisher([sample.Sample(
name='storage.objects.outgoing.bytes',
type=sample.TYPE_DELTA,
unit='B',
volume=bytes_sent,
user_id=env.get('HTTP_X_USER_ID'),
project_id=env.get('HTTP_X_TENANT_ID'),
resource_id=account.partition(self.reseller_prefix)[2],
timestamp=now,
resource_metadata=resource_metadata)])
# publish the event for each request
# request method will be recorded in the metadata
resource_metadata['method'] = method.lower()
publisher([sample.Sample(
name='storage.api.request',
type=sample.TYPE_DELTA,
unit='request',
volume=1,
user_id=env.get('HTTP_X_USER_ID'),
project_id=env.get('HTTP_X_TENANT_ID'),
resource_id=account.partition(self.reseller_prefix)[2],
timestamp=now,
resource_metadata=resource_metadata)])
def filter_factory(global_conf, **local_conf):
conf = global_conf.copy()
conf.update(local_conf)
def ceilometer_filter(app):
return CeilometerMiddleware(app, conf)
return ceilometer_filter
|
