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# -*- coding: utf-8 -*- |
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from __future__ import absolute_import, unicode_literals |
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import time |
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import inspect |
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import logging |
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import six |
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import requests |
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from wechatpy.utils import json, get_querystring |
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from wechatpy.session.memorystorage import MemoryStorage |
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from wechatpy.exceptions import WeChatClientException, APILimitedException |
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from wechatpy.client.api.base import BaseWeChatAPI |
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logger = logging.getLogger(__name__) |
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def _is_api_endpoint(obj): |
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return isinstance(obj, BaseWeChatAPI) |
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class BaseWeChatClient(object): |
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API_BASE_URL = '' |
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def __new__(cls, *args, **kwargs): |
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self = super(BaseWeChatClient, cls).__new__(cls) |
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api_endpoints = inspect.getmembers(self, _is_api_endpoint) |
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for name, api in api_endpoints: |
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api_cls = type(api) |
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api = api_cls(self) |
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setattr(self, name, api) |
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return self |
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def __init__(self, appid, access_token=None, session=None, timeout=None, auto_retry=True): |
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self.appid = appid |
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self.expires_at = None |
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self.session = session or MemoryStorage() |
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self.timeout = timeout |
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self.auto_retry = auto_retry |
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if isinstance(session, six.string_types): |
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from shove import Shove |
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from wechatpy.session.shovestorage import ShoveStorage |
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querystring = get_querystring(session) |
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prefix = querystring.get('prefix', ['wechatpy'])[0] |
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shove = Shove(session) |
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storage = ShoveStorage(shove, prefix) |
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self.session = storage |
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if access_token: |
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self.session.set(self.access_token_key, access_token) |
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self._http = requests.Session() |
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@property |
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def access_token_key(self): |
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return '{0}_access_token'.format(self.appid) |
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def _request(self, method, url_or_endpoint, **kwargs): |
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if not url_or_endpoint.startswith(('http://', 'https://')): |
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api_base_url = kwargs.pop('api_base_url', self.API_BASE_URL) |
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url = '{base}{endpoint}'.format( |
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base=api_base_url, |
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endpoint=url_or_endpoint |
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) |
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else: |
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url = url_or_endpoint |
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if 'params' not in kwargs: |
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kwargs['params'] = {} |
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if isinstance(kwargs['params'], dict) and \ |
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'access_token' not in kwargs['params']: |
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kwargs['params']['access_token'] = self.access_token |
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if isinstance(kwargs.get('data', ''), dict): |
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body = json.dumps(kwargs['data'], ensure_ascii=False) |
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body = body.encode('utf-8') |
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kwargs['data'] = body |
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kwargs['timeout'] = kwargs.get('timeout', self.timeout) |
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result_processor = kwargs.pop('result_processor', None) |
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res = self._http.request( |
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method=method, |
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url=url, |
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**kwargs |
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) |
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try: |
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res.raise_for_status() |
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except requests.RequestException as reqe: |
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raise WeChatClientException( |
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errcode=None, |
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errmsg=None, |
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client=self, |
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request=reqe.request, |
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response=reqe.response |
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) |
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return self._handle_result( |
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res, method, url, result_processor, **kwargs |
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) |
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def _decode_result(self, res): |
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try: |
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result = json.loads(res.content.decode('utf-8', 'ignore'), strict=False) |
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except (TypeError, ValueError): |
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# Return origin response object if we can not decode it as JSON |
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logger.debug('Can not decode response as JSON', exc_info=True) |
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return res |
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return result |
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def _handle_result(self, res, method=None, url=None, |
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result_processor=None, **kwargs): |
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if not isinstance(res, dict): |
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# Dirty hack around asyncio based AsyncWeChatClient |
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result = self._decode_result(res) |
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else: |
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result = res |
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if not isinstance(result, dict): |
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return result |
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if 'base_resp' in result: |
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# Different response in device APIs. Fuck tencent! |
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result.update(result.pop('base_resp')) |
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if 'errcode' in result: |
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result['errcode'] = int(result['errcode']) |
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if 'errcode' in result and result['errcode'] != 0: |
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errcode = result['errcode'] |
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errmsg = result.get('errmsg', errcode) |
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if errcode in (40001, 40014, 42001) and self.auto_retry: |
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logger.info('Access token expired, fetch a new one and retry request') |
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self.fetch_access_token() |
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access_token = self.session.get(self.access_token_key) |
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kwargs['params']['access_token'] = access_token |
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return self._request( |
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method=method, |
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url_or_endpoint=url, |
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result_processor=result_processor, |
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**kwargs |
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) |
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elif errcode == 45009: |
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# api freq out of limit |
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raise APILimitedException( |
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errcode, |
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errmsg, |
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client=self, |
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request=res.request, |
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response=res |
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) |
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else: |
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raise WeChatClientException( |
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errcode, |
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errmsg, |
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client=self, |
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request=res.request, |
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response=res |
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) |
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return result if not result_processor else result_processor(result) |
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def get(self, url, **kwargs): |
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return self._request( |
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method='get', |
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url_or_endpoint=url, |
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**kwargs |
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) |
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_get = get |
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def post(self, url, **kwargs): |
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return self._request( |
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method='post', |
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url_or_endpoint=url, |
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**kwargs |
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) |
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_post = post |
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def _fetch_access_token(self, url, params): |
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""" The real fetch access token """ |
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logger.info('Fetching access token') |
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res = self._http.get( |
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url=url, |
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params=params |
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) |
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try: |
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res.raise_for_status() |
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except requests.RequestException as reqe: |
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raise WeChatClientException( |
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errcode=None, |
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errmsg=None, |
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client=self, |
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request=reqe.request, |
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response=reqe.response |
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) |
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result = res.json() |
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if 'errcode' in result and result['errcode'] != 0: |
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raise WeChatClientException( |
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result['errcode'], |
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result['errmsg'], |
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client=self, |
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request=res.request, |
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response=res |
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) |
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expires_in = 7200 |
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if 'expires_in' in result: |
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expires_in = result['expires_in'] |
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self.session.set( |
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self.access_token_key, |
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result['access_token'], |
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expires_in |
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) |
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self.expires_at = int(time.time()) + expires_in |
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return result |
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def fetch_access_token(self): |
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raise NotImplementedError() |
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@property |
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def access_token(self): |
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""" WeChat access token """ |
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access_token = self.session.get(self.access_token_key) |
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if access_token: |
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if not self.expires_at: |
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# user provided access_token, just return it |
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return access_token |
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timestamp = time.time() |
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if self.expires_at - timestamp > 60: |
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return access_token |
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self.fetch_access_token() |
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return self.session.get(self.access_token_key) |
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jxtech /
wechatpy
