python tornado使用流生成图片的例子
人气:0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?id=aa" rel="external nofollow" > <img src="./pic?id=a" alt="{$source.name} NETWORK" border="0" /> </a> </body> </html>
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