tornado

Twisted API for Couchbase not working with Python Tornado

由 不羁岁月 提交于 2020-01-03 20:11:09
问题 I'm trying to run a Tornado server with Couchbase 4.0 Developer preview. import tornado.web import tornado.httpserver import tornado.options import tornado.ioloop import tornado.websocket import tornado.httpclient from tornado import gen import os.path from tornado.options import define, options, parse_command_line import time #from couchbase.bucket import Bucket from twisted.internet import reactor from txcouchbase.bucket import Bucket from couchbase.n1ql import N1QLQuery, N1QLError from

Unexpected tornado.ioloop.PeriodicCallback behavior

由 放肆的年华 提交于 2020-01-03 17:42:11
问题 Trying to figure out how PeriodicCallback s got scheduled, I wrote this script: import time import tornado.ioloop t0 = time.time() def foo(): time.sleep(1) print(time.time() - t0) tornado.ioloop.PeriodicCallback(foo, 2000).start() tornado.ioloop.IOLoop.instance().start() I expected it to fire either every 2 or every 3 seconds, depending on whether tornado waited until completion to schedule the next event. However, I got this: 3.00190114975 6.00296115875 10.0029530525 14.0029621124 18

Hosting a tornado/websocket application

由 纵然是瞬间 提交于 2020-01-03 11:00:14
问题 I wrote an application which makes use of the websocket implementation of Tornado and I am trying to find a host for it. As far as I can tell by reading google search results, google appengine does not support websockets at the moment. I'm not sure about heroku since I couldnt find any information. So my question is, if anybody knows a hoster where I could host my application? 回答1: The easiest thing might be to use a general IaaS (Infrastructure as a Service) cloud provider such as Amazon EC2

How can I cancel a hanging asyncronous task in tornado, with a timeout?

由 前提是你 提交于 2020-01-02 12:24:08
问题 My setup is python tornado server, which asynchronously processes tasks with a ThreadPoolExecutor . In some conditions, the task might turn into infinite loop. With the with_timeout decorator, I have managed to catch the timeout exception and return an error result to the client. The problem is that the task is still running in the background. How it is possible to stop the task from running in the ThreadPoolExecutor ? Or is it possible to cancel the Future ? Here is the code that reproduces

Python SSL Socket Server

由 浪子不回头ぞ 提交于 2020-01-02 08:56:09
问题 I want to set up a basic ssl-authenticated socket server to do some network communication. I'm getting the error below. It seems to be coming from the SSLIOStream not handshaking before reading: File "simple_ssl_server.py", line 70, in connection_ready node_io_stream.read_until("OK", on_ok) File "/home/tombrown/skyhook/lib/python2.7/site-packages/tornado-2.1.1-py2.7.egg/tornado/iostream.py", line 161, in read_until if self._read_to_buffer() == 0: File "/home/tombrown/skyhook/lib/python2.7

Python SSL Socket Server

由 China☆狼群 提交于 2020-01-02 08:53:36
问题 I want to set up a basic ssl-authenticated socket server to do some network communication. I'm getting the error below. It seems to be coming from the SSLIOStream not handshaking before reading: File "simple_ssl_server.py", line 70, in connection_ready node_io_stream.read_until("OK", on_ok) File "/home/tombrown/skyhook/lib/python2.7/site-packages/tornado-2.1.1-py2.7.egg/tornado/iostream.py", line 161, in read_until if self._read_to_buffer() == 0: File "/home/tombrown/skyhook/lib/python2.7

Passing a custom python function into a tornado template

由 筅森魡賤 提交于 2020-01-02 08:26:12
问题 I want to write a custom function and pass it unto my tornado template fine. Like def trimString(data): return data[0:20] then push this into my tornado file. This should allow me trim strings. Is this possible? Thanks. 回答1: It's not especially clear in the documentation, but you can do this easily by defining this function in a module and passing the module to tornado.web.Application as the ui_methods argument. I. E.: in ui_methods.py: def trim_string(data): return data[0:20] in app.py:

How to log requests to stdout in Tornado web server?

由 一世执手 提交于 2020-01-02 00:46:48
问题 I'm starting to develop a simple Tornado application, and I'd like to see request log in stdout while I develop. Currently I only see 404 warning messages. Is there a way to have all requests printed in stdout? 回答1: Add this to your app: import tornado.options tornado.options.parse_command_line() The parse_command_line function sets up logging. You can then pass --logging=loglevel (e.g. debug) 回答2: You can add this to you application: from tornado.log import enable_pretty_logging enable

Queue and ProcessPoolExecutor in Tornado

由 ╄→尐↘猪︶ㄣ 提交于 2020-01-01 21:47:19
问题 I'm attempting to use the new Tornado queue object along with concurrent.futures to allow my webserver to pass off cpu-intensive tasks to other processes. I want to have access to the Future object that's returned from the ProcessPoolExecutor from the concurrent.futures module so that I can query its state to show on the front-end (e.g. show the process is currently running; show that it has finished). I seem to have two hurdles with this method: How can I submit multiple q.get() objects to

Frequently Asked Questions

由 爱⌒轻易说出口 提交于 2020-01-01 18:35:13
转自：http://www.tornadoweb.org/en/stable/faq.html Frequently Asked Questions Why isn’t this example with time.sleep() running in parallel? My code is asynchronous, but it’s not running in parallel in two browser tabs. Why isn’t this example with time.sleep() running in parallel? Many people’s first foray into Tornado’s concurrency looks something like this: class BadExampleHandler(RequestHandler): def get(self): for i in range(5): print(i) time.sleep(1) Fetch this handler twice at the same time and you’ll see that the second five-second countdown doesn’t start until the first one has completely
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