Mercurial > templog
view py/configwaiter.py @ 258:03e540c3ec24
fix server side long polling
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 09 Jun 2015 23:29:11 +0800 |
parents | 0a1b642e3086 |
children | 26eee8591f61 |
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class ConfigWaiter(object): """ Waits for config updates from the server. http long polling """ def __init__(self, server): self.server = server self.epoch_tag = None self.http_session = aiohttp.ClientSession() @asyncio.coroutine def run(self): # wait until someting has been uploaded (the uploader itself waits 5 seconds) yield from asyncio.sleep(10) while True: yield from self.do() # avoid spinning too fast yield from server.sleep(1) @asyncio.coroutine def do(self): try: if self.epoch_tag: headers = {'etag': self.epoch_tag} else: headers = None r = yield from asyncio.wait_for( self.http_session.get(config.SETTINGS_URL, headers=headers), 300) if r.status == 200: resp = yield from asyncio.wait_for(r.json(), 300) self.epoch_tag = resp['epoch_tag'] epoch = self.epoch_tag.split('-')[0] if self.server.params.receive(resp['params'], epoch): self.server.reload_signal(True) except Exception as e: E("Error watching config: %s" % str(e))