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flask with server-sent events
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cppgohan
January 13, 2013
Technology
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flask with server-sent events
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cppgohan
January 13, 2013
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Transcript
@cppgohan with Server-Sent Events
Flask?
Flask? MicroFramework again...
Flask? MicroFramework again... Written in Python
=
=
Werkzeug WSGI utility library =
+ Werkzeug WSGI utility library =
+ Werkzeug WSGI utility library =
+ Werkzeug WSGI utility library Jinja2 template engine =
Hello.py Demo
Hello.py Demo
Hello.py Demo
index.html Demo
index.html Demo result???
index.html Demo result??? • terminal run: python hello.py • open
http://localhost:5000
Server-Sent Event server push的html5标准, 用法简易, 单次连接比polling高效些. 相比websocket的双向二进制数据, Server-Sent Event只是单向, HTTP协议.
(但浏览器调试工具往往没法看到服务器发来的数据, X_X) Server对Client的请求, 做stream方式的响应.
Server-Sent Event
Server-Sent Event 支 持 率 不 高 , 暂 时
只 能 ”玩 ” 要 兼 容 处 理
Demo index.html
Demo hello.py
Demo redis:
Demo redis: demo:FILE_TEXT -- 每次python读出来的文本 demo:FILE_TEXT_SEQ -- 为文本版本号, 每次文本更新, 版本号+1
/sever_push响应 -- 当FILE_TEXT_SEQ增加时, 将最新的文本返回给浏览器
Demo result???
Demo result??? • terminal run: python hello.py
Demo result??? • terminal run: python hello.py • open http://localhost:5000
Demo result??? • terminal run: python hello.py • open http://localhost:5000
• block!!!
Demo result??? • terminal run: python hello.py • open http://localhost:5000
• block!!! solution???
Demo result??? • terminal run: python hello.py • open http://localhost:5000
• block!!! • async WSGI server! (eg. gunicorn + gevent, gevent) solution???
Demo result??? • terminal run: python hello.py • open http://localhost:5000
• block!!! • async WSGI server! (eg. gunicorn + gevent, gevent) • terminal run: gunicorn -k gevent -b '0.0.0.0:5000' hello:app solution???
Demo result??? • terminal run: python hello.py • open http://localhost:5000
• block!!! • async WSGI server! (eg. gunicorn + gevent, gevent) • terminal run: gunicorn -k gevent -b '0.0.0.0:5000' hello:app • open http://localhost:5000 solution???
Demo result??? • terminal run: python hello.py • open http://localhost:5000
• block!!! • async WSGI server! (eg. gunicorn + gevent, gevent) • terminal run: gunicorn -k gevent -b '0.0.0.0:5000' hello:app • open http://localhost:5000 • open http://localhost:5000 again! solution???
More Demo Server下发代码示例
More Demo • start web server • open http://localhost:5000 •
server push js script... • browser excute js script... • ... Server下发代码示例
More Usage •网站动态更新 •区分客户端推送 •微博墙实现 •webgame服务器推送 •浏览器插件
Resources • http://www.python.org/dev/peps/pep-0333/ • http://werkzeug.pocoo.org/ • http://jinja.pocoo.org/ • http://flask.pocoo.org/ •
http://www.gevent.org/ • http://gunicorn.org/ • http://dev.w3.org/html5/eventsource/ • http://www.html5rocks.com/en/tutorials/eventsource/basics/ • http://www.w3schools.com/html/html5_serversentevents.asp
END; 2013, 分享不止!