tornado

Tornado - Python global variable

爱⌒轻易说出口 提交于 2020-01-14 03:47:08
问题 I'm trying to use Tornado with SqlAlchemy, I need to pass the current user from RequestHandler (tornado) to models (SqlAlchemy) in the insert or update action. But I don't want to pass the value directly to the model, example: #### RequestHandler POST method... user = Session.query(User).get(1) user.name = "bla, bla, bla..." user.updated_by = self.current_user # don't use... session.commit() I'm using a global variable, in a __ init__.py file, and set the current user value in the

Tornado Web & Persistent Connections

二次信任 提交于 2020-01-13 11:35:35
问题 How can I write Http server in TornadoWeb that will support persistent Connections. I mean will be able to receive many requests and answer to them without closing connection. How does it actually work in async? I just want to know how to write handler to handle persistent connection. How actually would it work? I have handler like that: class MainHandler(RequestHandler): count = 0 @asynchronous def post(self): #get header content type content_type = self.request.headers.get('Content-Type')

Under tornado v4+ WebSocket connections get refused with 403

点点圈 提交于 2020-01-11 15:39:25
问题 I have an older tornado server that handles vanilla WebSocket connections. I proxy these connections, via Nginx, from wss://info.mydomain.com to wss://mydomain.com:8080 in order to get around customer proxies that block non standard ports. After the recent upgrade to Tornado 4.0 all connections get refused with a 403. What is causing this problem and how can I fix it? 回答1: Tornado 4.0 introduced an, on by default, same origin check. This checks that the origin header set by the browser is the

Python Tornado: WSGI module missing?

耗尽温柔 提交于 2020-01-11 05:37:08
问题 I did a pip install tornado but I cannot run the following code because WSGI module is missing?? http://flask.pocoo.org/docs/deploying/wsgi-standalone/ from tornado.wsgi import WSGIContainer from tornado.httpserver import HTTPServer from tornado.ioloop import IOLoop from myapp import app http_server = HTTPServer(WSGIContainer(app)) http_server.listen(5000) IOLoop.instance().start() 回答1: If your file is named tornado.py, it will try to import things from that file instead of the directory on

Python web开发:几个模板系统的性能对比

和自甴很熟 提交于 2020-01-08 18:28:21
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 对比目标,jinja2,cheetah,mako,webpy,bottle,tornado,django的性能。 方法,随机生成一个二维数组,第一列是自增数据,第二列是长度为100的随机字符串,然后生成html,比较一次生成的时间。 说明,如果模板有编译缓存,打开。有其他方法加速,打开。生成缓存,关闭。不计算随机数据生成时间,一次生成后一直使用。 以下是文件有效内容,没用的都略去了。最后的顺序是因为我根据结果整理了一下调用次序。 —–testcheetah.tmpl—– #for $i in $l #end for $i[0] $i[1] —–testdjango.html—– {% for i in l %} {% endfor %} {{ i.0 }} {{ i.1 }} —–testjinja2.html—– {% for i in l %} {% endfor %} {{ i[0] }} {{ i[1] }} —–testmako.html—– % for i in l: % endfor ${i[0]} ${i[1]} —–testwebpy.html—– $def with(l) $for i in l: $i[0] $i[1] —–tmpl.py—– #!/usr/bin/python # -﹡-

Python Web 框架:Django、Flask 与 Tornado

安稳与你 提交于 2020-01-07 20:10:20
web框架是什么? web开发框架是一组工具,同时也提供了非常多的资源,供软件开发人员构建和管理网站、提供web服务、编写web应用程序。它是一个抽象工具,能使开发应用程序和重复使用代码的过程变得更容易。 为什么需要web开发框架? 进行自定义软件开发时,web开发框架让整个过程变得更容易,因而开发速度更快、更高效。许多开发框架都很便宜,这也使得整个客户机的成本更小。 一个被广泛使用的框架安全性更高。这主要依赖于该框架背后的社区,在这里,用户成为长期的测试人员,并可以提供修复。 如果发现了安全漏洞,可以访问框架的网站,告知特定的团队,这样他们就可以修复它。 Python web 目前较火的三大框架:Django、Flask 与 Tornado 1、Django Django是一个开放源代码的Web应用框架,由Python写成。采用了MTV的框架模式,即模型M,模板T和视图V。它最初是被开发来用于管理劳伦斯出版集团旗下的一些以新闻内容为主的网站的,即是CMS(内容管理系统)软件。 Django是一个高级的Python Web框架,以快速开发和实用简洁的设计闻名。它由经验丰富的开发人员构建,解决了Web开发的麻烦,因此用户可以专注于编写应用程序,而不需要担心返工。并且它是开源和免费的。 Python 界最全能的 web 开发框架,battery-include 各种功能完备

Python报错:TypeError: __init__() got an unexpected keyword argument 'io_loop' 原因及解决方案

生来就可爱ヽ(ⅴ<●) 提交于 2020-01-07 16:27:10
今天打开一个Python文件时,报错提示: TypeError: __init__() got an unexpected keyword argument 'io_loop' 明明是从旧电脑上拷贝到新电脑上的文件,之前运行是OK的,新电脑上运行怎么就报错了呢? 错误原因: 配置python环境时,默认tornado版本是最新的版本(恰好我新电脑重新配置了python环境,所以安装了最新版本),但是在4.0版本之后就废弃了io_loop参数。 解决方案: 1. 先卸载当前安装的tornado pip uninstall tornado 2. 安装低版本的tornado pip install tornado==4.1 来源: https://www.cnblogs.com/daniumiqi/p/12148239.html

Why does Tornado's WSGI support block for more than one request?

为君一笑 提交于 2020-01-06 23:45:01
问题 Imagine the following tornado app: import logging import time from tornado import gen, httpserver, ioloop, web, wsgi def simple_app(environ, start_response): time.sleep(1) status = "200 OK" response_headers = [("Content-type", "text/plain")] start_response(status, response_headers) return [b"Hello, WSGI world!\n"] class HelloHandler(web.RequestHandler): @gen.coroutine def get(self): yield gen.moment self.write('Hello from tornado\n') self.finish() def main(): wsgi_app = wsgi.WSGIContainer

Unit-testing a periodic coroutine with mock time

柔情痞子 提交于 2020-01-06 20:22:55
问题 I'm using Tornado as a coroutine engine for a periodic process, where the repeating coroutine calls ioloop.call_later() on itself at the end of each execution. I'm now trying to drive this with unit tests (using Tornado's gen.test) where I'm mocking the ioloop's time with a local variable t: DUT.ioloop.time = mock.Mock(side_effect= lambda: t) (DUT <==> Device Under Test) Then in the test, I manually increment t, and yield gen.moment to kick the ioloop. The idea is to trigger the repeating

RuntimeError: Cannot write() after finish(). May be caused by using async operations without the @asynchronous decorator

余生长醉 提交于 2020-01-06 15:19:01
问题 I am getting the above error while making a post request in the tornado server . I have a class like class RestRequestHandler(RequestHandler): def async_get(self, *args, **kwargs): pass def async_post(self, *args, **kwargs): pass The above class I am importing into another py file class get_question_details(RestRequestHandler): def async_post(self, activity_id, attempt_id, quiz_id, question_id, questionusage_id, slot, user_name, courseshortname): client = get_moodle_client() When I am making