Flask With Server-Sent Event
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Flask With Server-Sent Event by cppgohan sztechparty 20130317
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Flask With Server-Sent Event
- 1. with Server-Sent Events @cppgohan
- 2. Flask?
- 5. =
- 6. =
- 8. = + Werkzeug WSGI utility library
- 9. = + Werkzeug WSGI utility library
- 10. = + Werkzeug Jinja2 WSGI utility library template engine
- 11. Demo Hello.py
- 12. Demo Hello.py
- 13. Demo Hello.py
- 14. Demo index.html
- 16. Demo index.html result??? • terminal run: python hello.py • open http://localhost:5000
- 17. 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.
- 19. Server-Sent Event 支 持 率 不 要 能 高, 暂 兼 ”玩” 时 容 只 处 理
- 20. Demo index.html
- 21. Demo hello.py
- 22. Demo redis:
- 23. 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
- 24. Demo result???
- 25. Demo result??? • terminal run: python hello.py
- 26. Demo result??? • terminal run: python hello.py • open http://localhost:5000
- 27. Demo result??? • terminal run: python hello.py • open http://localhost:5000 • block!!!
- 28. Demo result??? • terminal run: python hello.py • open http://localhost:5000 • block!!! solution???
- 29. Demo result??? • terminal run: python hello.py • open http://localhost:5000 • block!!! solution??? • async WSGI server! (eg. gunicorn + gevent, gevent)
- 30. Demo result??? • terminal run: python hello.py • open http://localhost:5000 • block!!! solution??? • async WSGI server! (eg.-kgunicorn-bgevent, gevent)hello:app + • terminal run: gunicorn gevent '0.0.0.0:5000'
- 31. Demo result??? • terminal run: python hello.py • open http://localhost:5000 • block!!! solution??? • async WSGI server! (eg.-kgunicorn-bgevent, gevent)hello:app + • terminal run: gunicorn gevent '0.0.0.0:5000' • open http://localhost:5000
- 32. Demo result??? • terminal run: python hello.py • open http://localhost:5000 • block!!! solution??? • async WSGI server! (eg.-kgunicorn-bgevent, gevent)hello:app + • terminal run: gunicorn gevent '0.0.0.0:5000' • open http://localhost:5000 again! • open http://localhost:5000
- 34. More Demo Server下发代码示例 • start http://localhost:5000 web server • open push js script... • server excute js script... • browser • ...
- 35. 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
- 36. 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
- 37. END; 2013, 分享不止!