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1 class ConfigWaiter(object): |
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2 """ Waits for config updates from the server. http long polling """ |
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3 |
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4 def __init__(self, server): |
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5 self.server = server |
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6 self.epoch_tag = None |
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7 self.http_session = aiohttp.ClientSession() |
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8 |
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9 @asyncio.coroutine |
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10 def run(self): |
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11 # wait until someting has been uploaded (the uploader itself waits 5 seconds) |
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12 yield from asyncio.sleep(10) |
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13 while True: |
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14 yield from self.do() |
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15 |
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16 # avoid spinning too fast |
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17 yield from server.sleep(1) |
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18 |
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19 @asyncio.coroutine |
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20 def do(self): |
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21 try: |
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22 if self.epoch_tag: |
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23 headers = {'etag': self.epoch_tag} |
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24 else: |
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25 headers = None |
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26 |
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27 r = yield from asyncio.wait_for( |
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28 self.http_session.get(config.SETTINGS_URL, headers=headers), |
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29 300) |
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30 if r.status == 200: |
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31 resp = yield from asyncio.wait_for(r.json(), 300) |
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32 |
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33 self.epoch_tag = resp['epoch_tag'] |
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34 epoch = self.epoch_tag.split('-')[0] |
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35 if self.server.params.receive(resp['params'], epoch): |
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36 self.server.reload_signal(True) |
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37 |
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38 except Exception as e: |
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39 E("Error watching config: %s" % str(e)) |
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40 |
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41 |
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42 |
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43 |
