app.py

import json
from enum import IntEnum, unique
from functools import wraps
from typing import Optional, Any, Mapping, Tuple, Union, Iterable, Type, Callable

import flask
import requests
from flask import jsonify


@unique
class CommonErrorCode(IntEnum):
    SUCCESS = 0
    COMMON_FAILURE = 1


def flask_response(
    success: bool, data: Optional[Mapping[str, Any]] = None, message: Optional[str] = None, code: Optional[int] = None
):
    return jsonify(
        {
            'success': success,
            'code': 0 if success else (code or CommonErrorCode.COMMON_FAILURE),
            'message': (message or 'Success.') if success else (message or 'Failed.'),
            'data': data,
        }
    )


def success_response(data: Optional[Mapping[str, Any]] = None, message: Optional[str] = None):
    return flask_response(
        success=True,
        code=CommonErrorCode.SUCCESS,
        message=message,
        data=data,
    )


def failure_response(
    code: Optional[int] = None, message: Optional[str] = None, data: Optional[Mapping[str, Any]] = None
):
    return flask_response(
        success=False,
        code=code or CommonErrorCode.COMMON_FAILURE,
        message=message,
        data=data,
    )


_RESPONSE_VALUE_TYPE = Tuple[int, bool, int, str, Mapping[str, Any]]


def get_values_from_response(response: Union[requests.Response, flask.Response]) -> _RESPONSE_VALUE_TYPE:
    status_code = response.status_code

    _content = response.content if hasattr(response, 'content') else response.data
    _json = json.loads(_content.decode())
    success, code, message, data = _json['success'], _json['code'], _json.get('message', ''), _json.get('data', {})

    return status_code, success, code, message, data


class ResponsibleException(Exception):

    def __init__(
        self,
        code: int = CommonErrorCode.COMMON_FAILURE,
        message: Optional[str] = None,
        data: Optional[Mapping[str, Any]] = None,
        status_code: int = 400
    ):
        Exception.__init__(self, message)
        self.__code = code
        self.__message = message
        self.__data = data or {}
        self.__status_code = status_code

    def get_response(self):
        return failure_response(self.__code, self.__message, self.__data), self.__status_code


def responsible(classes: Iterable[Type[ResponsibleException]] = None):
    if classes is None:
        classes = (ResponsibleException, )

    def _decorator(func: Callable[..., Any]) -> Callable[..., Any]:

        @wraps(func)
        def _func(*args, **kwargs):
            try:
                ret = func(*args, **kwargs)
            except tuple(classes) as err:
                return err.get_response()
            else:
                return ret

        return _func

    return _decorator