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1 import asyncio |
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2 import aiohttp |
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3 |
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4 import utils |
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5 from utils import L,D,EX,W,E |
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6 import config |
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7 |
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8 class ConfigWaiter(object): |
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9 """ Waits for config updates from the server. http long polling """ |
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10 |
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11 def __init__(self, server): |
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12 self.server = server |
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13 self.epoch_tag = None |
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14 self.http_session = aiohttp.ClientSession() |
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15 |
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16 @asyncio.coroutine |
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17 def run(self): |
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18 # wait until someting has been uploaded (the uploader itself waits 5 seconds) |
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19 yield from asyncio.sleep(10) |
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20 while True: |
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21 yield from self.do() |
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22 |
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23 # avoid spinning too fast |
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24 yield from asyncio.sleep(1) |
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25 |
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26 @asyncio.coroutine |
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27 def do(self): |
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28 try: |
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29 if self.epoch_tag: |
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30 headers = {'etag': self.epoch_tag} |
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31 else: |
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32 headers = None |
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33 |
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34 r = yield from asyncio.wait_for( |
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35 self.http_session.get(config.SETTINGS_URL, headers=headers), |
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36 300) |
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37 D("waiter status %d" % r.status) |
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38 if r.status == 200: |
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39 rawresp = yield from asyncio.wait_for(r.text(), 300) |
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40 |
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41 resp = utils.json_load_round_float(rawresp) |
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42 |
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43 self.epoch_tag = resp['epoch_tag'] |
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44 D("waiter got epoch tag %s" % self.epoch_tag) |
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45 epoch = self.epoch_tag.split('-')[0] |
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46 if self.server.params.receive(resp['params'], epoch): |
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47 self.server.reload_signal(True) |
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48 elif r.status == 304: |
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49 pass |
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50 else: |
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51 # longer timeout to avoid spinning |
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52 yield from asyncio.sleep(30) |
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53 |
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54 except Exception as e: |
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55 E("Error watching config: %s" % str(e)) |
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56 |
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57 |
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58 |
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59 |
