json数据分页及根据参数返回功能

 

 根据前端参数后台对数据进行分页返回

 

HOST_SINGERS_URL = 'http://artistlistinfo.kuwo.cn/mb.slist?stype=artistlist&category=0&order=hot&pn=0&rn=100&encoding=utf8'
CNAME_SINGERS_URL = 'http://artistlistinfo.kuwo.cn/mb.slist?stype=artistlist&category=0&order=dict&pn=0&rn=100&encoding=utf8&prefix={}'
SINGERS_IMG_PRE_URL = 'http://img1.sycdn.kuwo.cn/star/starheads/'

def api(func):
    @wraps(func)
    def _deal_with(*args, **kwargs):
        response_data = demjson.encode(func(*args, **kwargs))
        response = HttpResponse(response_data, content_type='application/json')
        response["Access-Control-Allow-Origin"] = "*"
        response["Access-Control-Allow-Methods"] = "POST, GET, OPTIONS"
        response["Access-Control-Max-Age"] = "1000"
        response["Access-Control-Allow-Headers"] = "*"
        return response
    return _deal_with

@api
def get_singers(request):
    page = request.GET.get('page', '1')
    page = int(page) if page.isdigit() else 1
    size = 20
    cname = request.GET.get('cname', 'host').upper()
    if cname in [chr(i).upper() for i in range(97, 123)]:
        if not cache.has_key('{}.txt'.format(cname)):
            url = CNAME_SINGERS_URL.format(cname)
            response = requests.get(url)
            json_str = response.text
            print(cname)
            cache.set('{}.txt'.format(cname), json_str, 60)
        else:
            json_str = cache.get('{}.txt'.format(cname))
        json_obj = demjson.decode(json_str)
        artistlist = json_obj.get('artistlist', None)
        for artist in artistlist:
            artist['pic'] = SINGERS_IMG_PRE_URL + artist['pic']
        artist_dict = {
            'artistlist': artistlist[(page - 1) * size: page * size]
        }
        return artist_dict