# -*- coding: utf-8 -*-
# !/usr/bin/env python

from apps.web.constant import REQUEST_ID_HEADER
from utils import local, generate_request_id


def get_request_id(request):
    if hasattr(request, 'request_id'):
        return request.request_id
    else:
        return request.META.get(REQUEST_ID_HEADER, generate_request_id())

class RequestIdMiddleware(object):
    # Code for Django >= 1.10
    def __init__(self, get_response = None):
        self.get_response = get_response

    def __call__(self, request):
        request_id = get_request_id(request)
        request.request_id = request_id
        local.request_id = request_id

        response = self.get_response(request)

        del local.request_id
        return response

    # Compatibility methods for Django <1.10
    def process_request(self, request):
        request_id = get_request_id(request)
        request.request_id = request_id
        local.request_id = request_id

    def process_response(self, request, response):
        del local.request_id
        return response