from django.core.exceptions import PermissionDenied
from django.http import Http404
from rest_framework.response import Response
from rest_framework import exceptions
from rest_framework.views import set_rollback
from django.utils.translation import gettext_lazy as _
import traceback
from server.settings import myLogger

def custom_exception_hander(exc, context):
    """
    自定义异常处理
    """
    if isinstance(exc, Http404):
        exc = exceptions.NotFound()
    elif isinstance(exc, PermissionDenied):
        exc = exceptions.PermissionDenied()

    request_id = getattr(context['request'], 'request_id', None)
    if isinstance(exc, exceptions.APIException):
        headers = {}
        if getattr(exc, 'auth_header', None):
            headers['WWW-Authenticate'] = exc.auth_header
        if getattr(exc, 'wait', None):
            headers['Retry-After'] = '%d' % exc.wait

        if isinstance(exc.detail, (list, dict)):
            data = {'err_detail':exc.detail}
            data['err_code'] = exc.default_code
            data['err_msg'] = exc.default_detail
        else:
            data = {'err_msg': exc.detail, 'err_code':exc.get_codes()}

        set_rollback()
        data['request_id'] = request_id
        return Response(data, status=exc.status_code, headers=headers)
    err_str = traceback.format_exc()
    myLogger.error('{}-{}'.format(request_id, err_str))
    return Response(data={'err_code':'server_error', 'err_msg':'服务器错误', 'request_id': request_id}, status=500)