1. 程式人生 > >python tornado使用流生成圖片

python tornado使用流生成圖片

監控中,通常要使用圖片更直觀的看出叢集的執行狀況。

以下是一個簡單的demo,通過rrdtool生成動態的圖片。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?id=aa">
      <img src="./pic?id=a"
alt="{$source.name} NETWORK" border="0" />
    </a>
    </body>
</html>