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# -*- coding: utf-8 -*-
# Create your views here.
from django.shortcuts import render_to_response
from django.conf import settings
from random import randint
import logging
import re
META_LANG_KEY = 'HTTP_ACCEPT_LANGUAGE'
def serve_ads(request):
sample = _weighted_random_sample(settings.ADS_STRUCT)
accept_langs = _build_lang_array(request)
ads = [_trans_ad(a, accept_langs) for a in sample]
return render_to_response('ads.html', {'ads': ads, 'MEDIA_URL': settings.MEDIA_URL,})
def _build_lang_array(request):
accept_langs = [settings.DEFAULT_ADS_LANG]
if META_LANG_KEY in request.META:
accept_langs_raw = request.META[META_LANG_KEY]
# Ignore priority for now, hopefully they are in the correct order
# TODO: reorder per HTTP language RFC
accept_langs = [re.sub(';q=[0-9.]+', '' ,_).strip() for _ in accept_langs_raw.split(',')]
#accept_langs = [_.strip() for _ in accept_langs_raw.split(',')]
#accept_langs = accept_langs_raw.split(',')
# Handle dialects
accept_langs = [re.sub('[-_][_-a-zA-Z0-9]+', '', lang) for lang in accept_langs if '-' in lang]
return accept_langs
def _match_langs(accept_langs, available_langs):
lang = settings.DEFAULT_ADS_LANG
common_langs = set(accept_langs) & set(available_langs)
for _ in accept_langs:
if _ in common_langs:
lang = _
break
return lang
def _trans_ad(ad, accept_langs):
for k in settings.TRANS_KEYS:
if k not in ad:
continue
if isinstance(ad[k], dict):
lang = _match_langs(accept_langs, ad[k].keys())
ad[k] = ad[k][lang]
return ad
def _weighted_random_sample(ads):
ads_out = []
for i in xrange(settings.ADS_LENGTH):
indices = [a['weight'] for a in ads]
s = sum(indices)
r = randint(0, s-1)
cur_total = 0
for ad_i in xrange(len(ads)):
ad = ads[ad_i]
cur_total += ad['weight']
if r < cur_total:
ads_out.append(ad.copy())
ads = ads[:ad_i] + ads[ad_i + 1:]
break
ads_log_data_message = ','.join([a['name'] for a in ads_out])
logging.info(ads_log_data_message)
return ads_out
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