python tornado使用流生成图片的例子

(编辑：jimmy 日期: 2024/11/20 浏览：3 次 )

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.ioloop
import tornado.web
import os
import io
import os
from PIL import Image
from tornado.options import define, options, parse_command_line
from tornado.web import RequestHandler


class 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" rel="external nofollow" >
   <img src="/UploadFiles/2021-04-08/pic">

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