python tornado使用流生成图片

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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">      <img src="./pic?id=a"           alt="{$source.name} NETWORK" border="0" />    </a>    </body></html>

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