service

#!/usr/bin/python
import time, traceback, os, sys
from qrcode.image.pure import PymagingImage
from qrcode.main import QRCode
from hosted import node, api

class QRWriter(object):
    def __init__(self, target):
        self._target = target

    def update_img(self, url):
        if os.path.exists(self._target):
            return

        with open(self._target + ".tmp", "wb") as f:
            qr = QRCode(border=2, image_factory=PymagingImage)
            qr.add_data(url)
            im = qr.make_image()
            im.save(f)
        os.rename(self._target + ".tmp", self._target)

detail_page_qr = QRWriter("device_details.png")

def fetch_info():
    info = api.device_info.get()
    print >>sys.stderr, info
    node['/device_info'](dict(
        description = info['description'],
        location = info['location'],
    ))
    detail_page_qr.update_img(info['detail_url'])

if __name__ == "__main__":
    interval = 10
    while 1:
        try:
            fetch_info()
            interval = 60
        except:
            traceback.print_exc()
            interval = 30
        finally:
            time.sleep(interval)