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python tornado使用流生成图片的例子

2020-03-11 17:51 555 查看

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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