tornado

Tornado '@run_on_executor' is blocking

由 半城伤御伤魂 提交于 2020-01-22 20:54:10
问题 I would like to ask how tornado.concurrent.run_on_executor (later just run_on_executor ) works, because I probably do not understand how to run synchronous task to not block the main IOLoop. All the examples using run_on_executor , which I found, are using just time to block the loop. With time module it works fine, but when I try some time intesive calculations, using run_on_executor , the task blocks the IOLoop. I am able to see that the app uses multiple threads, but it is still blocking.

How to write a web proxy in Python

由 谁都会走 提交于 2020-01-22 05:18:12
问题 I'm trying to write a web proxy in python. The goal is to visit a url like: http://proxyurl/http://anothersite.com/ and see he contents of http://anothersite.com just like you would normally. I've gotten decently far by abusing the requests library, but this isn't really the intended use of the requests framework. I've written proxies with twisted before, but I'm not sure how to connect this into what I'm trying to do. Here's where I'm at so far... import os import urlparse import requests

python websocket with tornado. Socket aren't closed

由 試著忘記壹切 提交于 2020-01-17 02:50:28
问题 I'm a beginner with websocket, I'm trying to use tornado for that purpose. Here is my working code so far: from tornado import websocket from tornado import web import tornado.ioloop class EchoWebSocket(websocket.WebSocketHandler): def open(self): print "WebSocket opened" def on_message(self, message): self.write_message(u"You said: " + message) print message def on_close(self): print "WebSocket closed" def check_origin(self, origin): return True class MainHandler(tornado.web.RequestHandler):

Python的5个顶级异步框架

由 旧时模样 提交于 2020-01-16 20:47:57
Python在3.4引入了 asyncio 库，3.6新增了关键字 async和await，此后，异步框架迅速发展了起来，性能上能和Node.js比肩，除非是CPU密集型任务，否则没有理由不适用异步框架。 如果你是Web开发者，现在异步Web框架上有了更多选择！ 1、Tornado Tornado 根本不是什么新框架，它最初是由FriendFeed（后被Facebook收购）在2009年发布。从一开始就提供有异步编程的功能。 Tornado 不仅仅是Web框架，同时它内置了很多异步模块，可用于自己构建异步应用。这些模块包括： 协同程序和其他原语（tornado.gen，tornado.locks，tornado.queues等） 网络模块（tornado.ioloop，tornado.iostream） 异步服务器和客户端（tornado.httpserver，httpclient，等） 通过这些模块，Tornado 构建了自己的异步Web框架模块。 import tornado.ioloopimport tornado.webclass MainHandler(tornado.web.RequestHandler): def get(self): self.write("Hello, world")def make_app(): return tornado.web

tornado.web.stream_request_body: _xsrf missing error even with _xsrf input within html

由 你说的曾经没有我的故事 提交于 2020-01-16 13:20:10
问题 Utilizing the Tornado library within Python I have come across a very unusual error. It seems that when I have decorated my file upload handler with '@tornado.web.stream_request_body' the webserver throws the error: WARNING:tornado.general:403 POST /upload (ip-address): '_xsrf' argument missing from POST WARNING:tornado.access:403 POST /upload (ip-address) 1.44ms The code governing the upload is as follows: @tornado.web.stream_request_body class Upload(BaseHandler): def prepare(self): print

Python code for DynamoDB query is working on v3.6 but not working in python 2.7

由 99封情书 提交于 2020-01-16 03:27:09
问题 I have a DynamoDB query with boto3 framework, which works on my local machine running Python 3.6, but not my server running Python 2.7. The working code on my local machine: dyndb = boto3.resource('dynamodb') table = dyndb.Table('XXXXXXX') response = table.query( IndexName = "XXX-XXX-index", ProjectionExpression = "AssessID,SNo,Details,Status,OTP", KeyConditionExpression = Key('OTP').eq(otp)) The code running on server... global user_otp dyndb = boto3.resource('dynamodb') table = dyndb.Table(

tornado学习笔记day03-响应输出

由 爷，独闯天下 提交于 2020-01-15 14:53:21
write: 作用: 将chunk中的数据写到输出缓冲区 利用write方法写json数据 我们自己手动序列化json的那种方式Content-Type 的属性值为text-html 而我们采用write自动序列化方式,我们的content-type 属性为application/json set_default_headers(): 作用: 在进入HTTP响应方法之前被调用 可以重新写该方法来设置默认的headers 注意: 在这个HTTP处理方法中使用set_header设置的字段会覆盖set_default_headers()的值 这个set_header和set_default_headers()是有执行的先后顺序的,默认那个当然那先就执行了 set_status(status_code,reason=none): 作用:为响应设置状态码 参数: status_code: 状态码的值,为int类型 如果reason的值为none,则状态码必须为正常值 reason String类型 描述状态码的词组,比如 404 not found 中的 not found 重定向 self.redirect(url) : 作用: 比如你有时候写index,有时候不写,都能进到首页里面,这就是重定向的作用 重定向到url网址 示例: class RedirectHandler (

tornado学习笔记day06-应用安全

由 此生再无相见时 提交于 2020-01-15 14:30:51
应用安全 cookie 普通cookie 一般我们的用户表中都有啥呢 你在购物的时候,加入购物车,让你登录,那你登录之后,他怎么知道你登录了呢 token 这个值是随机的,存在 cookie 里面 设置 原型: 设置 cookie 的方法 def set_cookie ( self , name : str , value : Union [ str , bytes ] , domain : str = None , expires : Union [ float , Tuple , datetime . datetime ] = None , path : str = "/" , expires_days : int = None , ** kwargs : Any ) - > None : 参数 name:我们设置的 cookie 的名字 value:cookie的值 domain:提交 cookie 时匹配的域名,也就是哪个ip拿过来的 path:提交 cookie 时匹配的路径 expires:设置 cookie 的有效期,可以是时间磋整数,时间元组, datetime 类型,为UTC时间 expires_days:设置cookie的有效期(天数)但是他的优先级低于expires 实例: 原理 设置 cookie 实际上是通过设置 header 的 Set-Cookie

How can I start multiple Tornado Server instances in multiple ports

由 主宰稳场 提交于 2020-01-15 06:38:29
问题 I need to start the blog demo in the following ports: 127.0.0.1:8000 127.0.0.1:8001 127.0.0.1:8002 127.0.0.1:8003 When I run the application using: ./demos/blog/blog.py it starts in port 8888 as defined by: define("port", default=8888, help="run on the given port", type=int) How do I run multiple instances in multiple ports? 回答1: I found what I was looking for: ./demos/blog/blog.py --port=8889 回答2: Make sure you know, the --port option gets parsed by the options module of the Tornado

HTML#表单提交标签

由 旧巷老猫 提交于 2020-01-14 12:06:19
### 下面这段代码可以参考http://www.tornadoweb.org/en/stable/，这个是tornado宽框架 import tornado.ioloop import tornado.web class MainHandler(tornado.web.RequestHandler): def get(self): print('get111') u = self.get_argument('user') p = self.get_argument('pwd') if u == 'lws' and p =='lws123': self.write("welcome") else: self.write('滚') def post(self): u = self.get_argument('user') p = self.get_argument('pwd') print(u,p) self.write("POST") def make_app(): return tornado.web.Application([ (r"/", MainHandler), ]) if __name__ == "__main__": app = make_app() app.listen(8888) tornado.ioloop.IOLoop.current().start() ##
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