def _update_total_meters_count(request):
'''
Temporarily stores total_meters_count into session for speeding up queries
Result expires after 180 seconds.
:param request:
:return: (int) total meters' count
'''
if request.session.has_key('total_meters_count'):
refreshed_time = request.session['refreshed_time']
delta = time.time() - refreshed_time
if delta < 1000:
print 'cache hit on _update_meters_count'
return
request.session['refreshed_time'] = time.time()
meter_list = ceilometer_api.get_meters(request.session['token'],limit=0, skip=0)['data']
request.session['total_meters_count'] = len(meter_list)
return request.session['total_meters_count']
def get_meters(request):
# Deal wth parameters
limit = 10 if 'length' not in request.GET else request.GET['length']
skip = 0 if 'start' not in request.GET else request.GET['start']
# TODO(pwwp):
# Enhance error handling for token and result
token = get_token(request, token_type='token')['token']
request.session['token'] = token
result = ceilometer_api.get_meters(token, limit, skip)
_update_total_meters_count(request)
if result['status'] == 'success':
result['recordsTotal'] = request.session['total_meters_count']
result['recordsFiltered'] = request.session['total_meters_count']
return HttpResponse(json.dumps(result), content_type='application/json')
else:
return HttpResponse(json.dumps(result), content_type='application/json')