Tornado is an open source version of the scalable, non-blocking web server and tools that power FriendFeed. The FriendFeed application is written using a web framework that looks a bit like web.py or Google's webapp, but with additional tools and optimizations to take advantage of the underlying non-blocking infrastructure.
The framework is distinct from most mainstream web server frameworks (and certainly most Python frameworks) because it is non-blocking and reasonably fast. Because it is non-blocking and uses
Manual installation: Download tornado-2.4.1.tar.gz
Prerequisites: Tornado runs on Python 2.5, 2.6, 2.7 and 3.2.
Tornado is one of Facebook's open source technologies.The framework is distinct from most mainstream web server frameworks (and certainly most Python frameworks) because it is non-blocking and reasonably fast. Because it is non-blocking and uses
epoll or kqueue,
it can handle thousands of simultaneous standing connections, which
means it is ideal for real-time web services. We built the web server
specifically to handle FriendFeed's real-time features — every active
user of FriendFeed maintains an open connection to the FriendFeed
servers. (For more information on scaling servers to support thousands
of clients, see The C10K problem.)Upgrading from Tornado 1.x
Tornado 2.0 introduces several potentially backwards-incompatible changes, including in particular automatic escaping of template output. Users who are upgrading from Tornado 1.x should see the release notes for information about backwards compatibility.Quick links
Hello, world
Here is the canonical "Hello, world" example app for Tornado:import tornado.ioloop
import tornado.web
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, world")
application = tornado.web.Application([
(r"/", MainHandler),
])
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()Installation
Automatic installation: Tornado is listed in PyPI and can be installed withpip or easy_install.
Note that the source distribution includes demo applications that are
not present when Tornado is installed in this way, so you may wish to
download a copy of the source tarball as well.Manual installation: Download tornado-2.4.1.tar.gz
tar xvzf tornado-2.4.1.tar.gz
cd tornado-2.4.1
python setup.py build
sudo python setup.py installPYTHONPATH instead of building with setup.py, since the standard library includes epoll support.Prerequisites: Tornado runs on Python 2.5, 2.6, 2.7 and 3.2.
- On Python 2.6 and 2.7, there are no dependencies outside the Python standard library, although PycURL (version 7.18.2 or higher required; version 7.21.1 or higher recommended) may be used if desired.
- On Python 2.5, PycURL is required, along with simplejson and the Python development headers (typically obtained by installing a package named something like
python-devfrom your operating system). - On Python 3.2, the distribute package is required. Note that Python 3 support is relatively new and may have bugs.
Discussion and support
You can discuss Tornado and report bugs on the Tornado developer mailing list. Links to additional resources can be found on the Tornado wiki.from http://www.tornadoweb.org/,http://www.tornadoweb.cn/documentation
related post: http://briteming.blogspot.com/2013/03/tornado-supervisor.html
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tornado安装运行helloworld的例子
运行环境是ubuntu10.04
tornado的网站地址:
http://www.tornadoweb.org/
下载最新的安装包:
https://github.com/downloads/facebook/tornado/tornado-2.4.tar.gz
下载后解压,安装
tar zxvf tornado-2.4.tar.gz cd tornado-2.4 python setup.py build python setup.py install安装后:
cd demos/helloworld python helloworld.py这样我们的运行在tornado下的helloword例子就运行起来了,在浏览器中访问: http://IP:8888,就可以看到helloworld了.
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Tornado Web Server
Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed. By using non-blocking network I/O, Tornado can scale to tens of thousands of open connections, making it ideal for long polling, WebSockets, and other applications that require a long-lived connection to each user.Hello, world
Here is a simple "Hello, world" example web app for Tornado:import tornado.ioloop
import tornado.web
class MainHandler(tornado.web.RequestHandler):
def get(self):
self.write("Hello, world")
application = tornado.web.Application([
(r"/", MainHandler),
])
if __name__ == "__main__":
application.listen(8888)
tornado.ioloop.IOLoop.instance().start()
This example does not use any of Tornado's asynchronous features; for
that see this simple chat room.Installation
Automatic installation:pip install tornadoTornado is listed in PyPI and can be installed with pip or easy_install. Note that the source distribution includes demo applications that are not present when Tornado is installed in this way, so you may wish to download a copy of the source tarball as well.
Manual installation: Download the latest source from PyPI.
tar xvzf tornado-$VERSION.tar.gz cd tornado-$VERSION python setup.py build sudo python setup.py installThe Tornado source code is hosted on GitHub.
Prerequisites: Tornado runs on Python 2.6, 2.7, 3.2, and 3.3. It has no strict dependencies outside the Python standard library, although some features may require one of the following libraries:
- unittest2 is needed to run Tornado's test suite on Python 2.6 (it is unnecessary on more recent versions of Python)
- concurrent.futures is the recommended thread pool for use with Tornado and enables the use of tornado.netutil.ThreadedResolver. It is needed only on Python 2; Python 3 includes this package in the standard library.
- pycurl is used by the optional tornado.curl_httpclient. Libcurl version 7.18.2 or higher is required; version 7.21.1 or higher is recommended.
- Twisted may be used with the classes in tornado.platform.twisted.
- pycares is an alternative non-blocking DNS resolver that can be used when threads are not appropriate.
- Monotime adds support for a monotonic clock, which improves reliability in environments where clock adjustments are frequent. No longer needed in Python 3.3.
Discussion and support
You can discuss Tornado on the Tornado developer mailing list, and report bugs on the GitHub issue tracker. Links to additional resources can be found on the Tornado wiki.Tornado is one of Facebook's open source technologies. It is available under the Apache License, Version 2.0.
This web site and all documentation is licensed under Creative Commons 3.0.
from https://github.com/facebook/tornado
