annotate py/uploader.py @ 484:4a51e2bf689b

a few fixes
author Matt Johnston <matt@ucc.asn.au>
date Thu, 06 Feb 2014 20:35:43 +0800
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1 import json
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2 import hmac
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3 import zlib
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4 import binascii
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5 import urllib
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6 import urllib2
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7
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8 import gevent
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9
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10 import config
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11 from utils import L,D,EX,W,E
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12 import utils
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13
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14 class Uploader(gevent.Greenlet):
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15 def __init__(self, server):
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16 gevent.Greenlet.__init__(self)
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17 self.server = server
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18
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19 def _run(self):
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20 gevent.sleep(5)
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21 while True:
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22 self.do()
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23 gevent.sleep(config.UPLOAD_SLEEP)
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24
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25 def get_tosend(self, readings):
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26 tosend = {}
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27
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28 tosend['fridge_on'] = self.server.fridge.is_on()
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29
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30 tosend['now'] = self.server.now()
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31 tosend['readings'] = readings
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32
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33 tosend['wort_name'] = self.server.wort_name
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34 tosend['fridge_name'] = self.server.wort_name
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35
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36 tosend.update(dict(self.server.params))
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37
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38 tosend['start_time'] = self.server.start_time
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39 tosend['uptime'] = utils.uptime()
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40
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41 return tosend
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42
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43 def send(self, tosend):
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44 js = json.dumps(tosend)
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45 js_enc = binascii.b2a_base64(zlib.compress(js))
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46 mac = hmac.new(config.HMAC_KEY, js_enc).hexdigest()
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47 url_data = urllib.urlencode( {'data': js_enc, 'hmac': mac} )
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48 con = urllib2.urlopen(config.UPDATE_URL, url_data)
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49 result = con.read(100)
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50 if result != 'OK':
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51 raise Exception("Server returned %s" % result)
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52
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53 def do(self):
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54 readings = self.server.take_readings()
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55 try:
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56 tosend = self.get_tosend(readings)
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57 nreadings = len(readings)
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58 self.send(tosend)
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59 readings = None
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60 D("Sent updated %d readings" % nreadings)
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61 except urllib2.HTTPError, e:
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62 E("Error in uploader: %s" % str(e))
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63 except Exception, e:
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64 EX("Error in uploader: %s" % str(e))
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65 finally:
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66 if readings is not None:
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67 self.server.pushfront(readings)