class LoginHandler(RequestHandler):
 def post(self):
 req_data = json.loads(self.request.body)
 js_code = req_data.get('js_code')
 
 # 开始换取用户的信息
 user_info = get_user_info(js_code=js_code)
 openid = user_info['openid']
 session_key = user_info['session_key']
 user_uuid = str(uuid.uuid4()) # 暴露给小程序端的用户标示
 
 # 用来维护用户的登录态
 User.save_user_session(
   user_uuid=user_uuid,
   openid=openid,
   session_key=session_key
 )
 
 # 微信小程序不能设置cookie, 把用户信心存在了headers中
 self.set_header('Authorization', user_uuid)
 # 存储用户信息
 User.save_user_info(open_id=openid)
 self.set_status(204)

def get_user_info(js_code):

 req_params = {
 "appid": 'app_id', # 小程序ID
 "secret": 'secret', # 小程序 secret
 "js_code": js_code,
 "grant_type": 'authorization_code'
 } 
 req_resutl = requests.get('https://api.weixin.qq.com/sns/jscode2session', params=req_params, timeout=3, verify=False)
 return req_result.json()

user_redis = StrictRedis.from_url('redis//localhost:6379')

class User(object):
 REDIS_EXPIRES = 7 * 24 * 60 * 60
 
 @classmethod
 def save_user_session(cls, user_uuid, openid, session_key):
 user_session_value = {
 'openid':openid,
 'session_key':session_key
 }
 user_session_key = 'US:' + user_uuid
 with user_redis.pipeline(transaction=False) as pipe:
 pipe.hmset(user_session_key, user_session_value)
 pipe.expire(user_session_key, cls.REDIS_EXPIRES)
 pipe.execute()

from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base

# mysql 相关设置
engine = create_engine('mysql://root:pwd@localhost/wechat')
conn = engine.connect()

Base = declarative_base()
Base.metadata.reflect(engine)
tables = Base.metadata.tables

class User(object):
 table = tables['user']

 @classmethod
 def save_user_info(cls, open_id):
 # 存储用户信心
 sql = cls.table.insert().values(open_id=open_id)
 conn.execute(sql)

CREATE TABLE `user`(
 `id` int(20) unsigned NOT NULL AUTO_INCREMENT,
 `open_id` varchar(32) NOT NULL COMMENT '用户 open_id',
 `created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
 `updated_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',
 PRIMARY KEY (`id`),
 KEY `idx_oid` (`open_id`)
) ENGINE=InnoDB default CHARSET=utf8mb4;

import json

import requests
from redis import StrictRedis
from tornado.web import RequestHandler

redis = StrictRedis.from_url('redis//localhost:6379')

def get_access_token():
 payload = {
 'grant_type': 'client_credential',
 'appid': 'appid',
 'secret': 'secret'
 }
req = requests.get('https://api.weixin.qq.com/cgi-bin/token', params=payload, timeout=3, verify=False)
access_token = req.json().get('access_token')
redis.set('ACCESS_TOKEN', access_token)

class FormHandler(RequestHandler):
 def post(self):
 req_data = self.request.body
 req_data = json.loads(req_data)
 form_id = req_data.get('from_id')
 remplate_push(form_id) # 使用消息进行模板推送
 
def template_push(form_id):
 data = {
 "touser": 'open_id',
 "template_id": 'template_id',
 "page": 'pages/index/index',
 "form_id": form_id,
 "data":{
 "keyword1":{
 "value": "value"
 }
 }
 "emphasis_keyword": ''
 }
 access_token = redis.get('ACCESS_TOKEN')
 push_url = 'https://api.weixin.qq.com/cgi-bin/message/wxopen/template/send?access_token={}'.format(access_token)
 requests.post(push_url, json=data, timeout=3, verify=False)