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1 import asyncio |
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2 import datetime |
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3 |
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4 import aiohttp |
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5 |
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6 import utils |
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7 from utils import L,D,EX,W,E |
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8 import config |
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9 |
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10 class ConfigWaiter(object): |
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11 """ Waits for config updates from the server. http long polling """ |
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12 |
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13 def __init__(self, server): |
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14 self.server = server |
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15 self.epoch_tag = None |
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16 self.http_session = aiohttp.ClientSession() |
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17 self.limitlog = utils.NotTooOften(datetime.timedelta(minutes=15)) |
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18 |
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19 @asyncio.coroutine |
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20 def run(self): |
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21 # wait until someting has been uploaded (the uploader itself waits 5 seconds) |
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22 yield from asyncio.sleep(10) |
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23 while True: |
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24 yield from self.do() |
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25 |
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26 # avoid spinning too fast |
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27 yield from asyncio.sleep(1) |
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28 |
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29 @asyncio.coroutine |
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30 def do(self): |
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31 try: |
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32 if self.epoch_tag: |
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33 headers = {'etag': self.epoch_tag} |
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34 else: |
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35 headers = None |
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36 |
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37 r = yield from asyncio.wait_for( |
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38 self.http_session.get(config.SETTINGS_URL, headers=headers), |
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39 300) |
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40 D("waiter status %d" % r.status) |
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41 if r.status == 200: |
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42 rawresp = yield from asyncio.wait_for(r.text(), 600) |
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43 |
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44 resp = utils.json_load_round_float(rawresp) |
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45 |
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46 self.epoch_tag = resp['epoch_tag'] |
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47 D("waiter got epoch tag %s" % self.epoch_tag) |
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48 epoch = self.epoch_tag.split('-')[0] |
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49 if self.server.params.receive(resp['params'], epoch): |
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50 self.server.reload_signal(True) |
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51 elif r.status == 304: |
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52 pass |
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53 else: |
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54 # longer timeout to avoid spinning |
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55 text = yield from asyncio.wait_for(r.text(), 600) |
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56 D("Bad server response. %d %s" % (r.status, text)) |
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57 yield from asyncio.sleep(30) |
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58 |
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59 except aiohttp.errors.ClientError as e: |
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60 self.limitlog.log("Error with configwaiter: %s" % str(e)) |
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61 except asyncio.TimeoutError as e: |
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62 self.limitlog.log("configwaiter http timed out: %s" % str(e)) |
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63 except Exception as e: |
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64 EX("Error watching config: %s" % str(e)) |
