python tornado使用流生成图片的例子

2019-11-25 11:24:32

字体：大中小

来源：转载

供稿：网友

监控中，通常要使用图片更直观的看出集群的运行状况。

以下是一个简单的demo，通过rrdtool生成动态的图片。Python3, tornado.

web.py

templates/index.html

import tornado.ioloopimport tornado.webimport osimport ioimport osfrom PIL import Imagefrom tornado.options import define, options, parse_command_linefrom tornado.web import RequestHandlerclass PicHandles(RequestHandler):  def get(self):    id = self.get_argument('id')    pic = open('F:/soft_bak/'+id+'.png', 'rb')    pics = pic.read()    self.write(pics)    self.set_header("Content-type", "image/png")class GetPicHandles(RequestHandler):  def get(self):    self.render("index.html")def create_rrdtool_pic():  # os.system("/usr/bin/rrdtool graph /tmp/a.png    --start '-3600s'     --end now     --width 400     --height 100     --title ' Grid Grid last hour last hour'     --vertical-label load_one     --slope-mode      DEF:'sum'='/var/lib/ganglia/rrds/cluster/__SummaryInfo__/load_one.rrd:sum':AVERAGE AREA:'sum'#555555:'  '     CDEF:sum_pos=sum,0,LT,0,sum,IF     VDEF:sum_last=sum_pos,LAST     VDEF:sum_min=sum_pos,MINIMUM VDEF:sum_avg=sum_pos,AVERAGE     VDEF:sum_max=sum_pos,MAXIMUM     GPRINT:'sum_last':'Now/:%7.2lf%s'     GPRINT:'sum_min':'Min/:%7.2lf%s'     GPRINT:'sum_avg':'Avg/:%7.2lf%s'     GPRINT:'sum_max':'Max/:%7.2lf%s/l' ")  img = Image.open("F:/soft_bak/a.png")  return img, ""class GenPicHandler(tornado.web.RequestHandler):  def get(self, *args, **kwargs):    imgio=io.BytesIO()    img,code=create_rrdtool_pic()    img.save(imgio,'PNG')    self.set_header('Content-Type', 'image/png')    self.write(imgio.getvalue())define('port', default = 9900, type = int,)def main():  parse_command_line()  app = tornado.web.Application(    [      (r"/pic", PicHandles),      (r"/getPic", GetPicHandles),      (r"/getGenPic", GenPicHandler),    ],    debug=True,    default_host="0.0.0.0",    template_path=os.path.join(os.path.dirname(__file__), "templates")  )  app.listen(options.port)  tornado.ioloop.IOLoop.instance().start()if __name__ =='__main__':  main()

<!DOCTYPE html><html>  <head><title>Poem Maker Pro</title></head>  <body>  <a href="./pic?id=aa" rel="external nofollow" >   <img src="./pic?id=a"      alt="{$source.name} NETWORK" border="0" />  </a>  </body></html>

以上这篇python tornado使用流生成图片的例子就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持武林网。

上一篇：Python3常用内置方法代码实例

下一篇：解决pandas展示数据输出时列名不能对齐的问题