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# Copyright (c) 2013 eNovance
#
# 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.
"""Send notifications on request"""
import os.path
import sys
import traceback as tb
from oslo_config import cfg
from oslo_context import context
import oslo_messaging
import six
import webob.dec
from pycadf._i18n import _
from pycadf.middleware import base
LOG = None
def log_and_ignore_error(fn):
def wrapped(*args, **kwargs):
try:
return fn(*args, **kwargs)
except Exception as e:
if LOG:
LOG.exception(_('An exception occurred processing '
'the API call: %s ') % e)
return wrapped
class RequestNotifier(base.Middleware):
"""Send notification on request."""
@classmethod
def factory(cls, global_conf, **local_conf):
"""Factory method for paste.deploy."""
conf = global_conf.copy()
conf.update(local_conf)
def _factory(app):
return cls(app, **conf)
return _factory
def __init__(self, app, **conf):
global LOG
proj = cfg.CONF.project
TRANSPORT_ALIASES = {}
if proj:
log_mod = '%s.openstack.common.log' % proj
if log_mod in sys.modules:
LOG = sys.modules[log_mod].getLogger(__name__)
# Aliases to support backward compatibility
TRANSPORT_ALIASES = {
'%s.openstack.common.rpc.impl_kombu' % proj: 'rabbit',
'%s.openstack.common.rpc.impl_qpid' % proj: 'qpid',
'%s.openstack.common.rpc.impl_zmq' % proj: 'zmq',
'%s.rpc.impl_kombu' % proj: 'rabbit',
'%s.rpc.impl_qpid' % proj: 'qpid',
'%s.rpc.impl_zmq' % proj: 'zmq',
}
self.service_name = conf.get('service_name')
self.ignore_req_list = [x.upper().strip() for x in
conf.get('ignore_req_list', '').split(',')]
self.notifier = oslo_messaging.Notifier(
oslo_messaging.get_transport(cfg.CONF, aliases=TRANSPORT_ALIASES),
os.path.basename(sys.argv[0]))
super(RequestNotifier, self).__init__(app)
@staticmethod
def environ_to_dict(environ):
"""Following PEP 333, server variables are lower case, so don't
include them.
"""
return dict((k, v) for k, v in six.iteritems(environ)
if k.isupper() and k != 'HTTP_X_AUTH_TOKEN')
@log_and_ignore_error
def process_request(self, request):
request.environ['HTTP_X_SERVICE_NAME'] = \
self.service_name or request.host
payload = {
'request': self.environ_to_dict(request.environ),
}
self.notifier.info(context.get_admin_context().to_dict(),
'http.request', payload)
@log_and_ignore_error
def process_response(self, request, response,
exception=None, traceback=None):
payload = {
'request': self.environ_to_dict(request.environ),
}
if response:
payload['response'] = {
'status': response.status,
'headers': response.headers,
}
if exception:
payload['exception'] = {
'value': repr(exception),
'traceback': tb.format_tb(traceback)
}
self.notifier.info(context.get_admin_context().to_dict(),
'http.response', payload)
@webob.dec.wsgify
def __call__(self, req):
if req.method in self.ignore_req_list:
return req.get_response(self.application)
else:
self.process_request(req)
try:
response = req.get_response(self.application)
except Exception:
exc_type, value, traceback = sys.exc_info()
self.process_response(req, None, value, traceback)
raise
else:
self.process_response(req, response)
return response
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