潭州课堂25班：Ph201805201 tornado 项目 第十课 深入应用异步和协程（课堂笔记）

tornado 相关说明 

需求： 增加 /save 的 handler，实现异步保存指定 URL 图片的功能

从网页上得到一张图片地址，由这个地址将图片保存到服务器，并将相关数据保存到数据库

　　

import requests

from .main import AuthBaseHandler
from utlis.photo import UploadImg, add_post_for

class SyncSaveHandler(AuthBaseHandler):
    """同步版本的保存 url """
    def get(self, *args, **kwargs):
        save_url = self.get_argument('save_url', None)

        res = requests.get(save_url)
        uim = UploadImg('a.jpg', self.settings['static_path'])
        uim.save_upload(res.content)
        uim.save_thumb()

        post = add_post_for(self.current_user, uim.upload_url, uim.thumb_url)
        # post = add_post_for(username, uim.upload_url, uim.thumb_url)


        self.redirect('/post/{}'.format(post.id))

　　

from tornado.gen import coroutine                  # 装饰器
from tornado.httpclient import AsyncHTTPClient     # 异步模块

from .main import AuthBaseHandler
from utlis.photo import UploadImg, add_post_for

class AyncSaveHandler(AuthBaseHandler):
    """异步版本保存 URL"""
    @coroutine
    def get(self, *args, **kwargs):
        save_url = self.get_argument('save_url', None)
        username = self.get_argument('name', None)
        client = AsyncHTTPClient()

        # res = requests.get(save_url)
        res = yield client.fetch(save_url, request_timeout=20)
        uim = UploadImg('a.jpg', self.settings['static_path'])
        uim.save_upload(res.body)
        uim.save_thumb()

        post = add_post_for(self.current_user, uim.upload_url, uim.thumb_url)
        # post = add_post_for(username, uim.upload_url, uim.thumb_url)

        self.redirect('/post/{}'.format(post.id))