def wait_for_metadata_service(self): mcfg = self.ds_cfg if not hasattr(mcfg, "get"): mcfg = {} max_wait = 120 try: max_wait = int(mcfg.get("max_wait", max_wait)) except Exception: util.logexc(log) log.warn("Failed to get max wait. using %s" % max_wait) if max_wait == 0: return False timeout = 50 try: timeout = int(mcfg.get("timeout", timeout)) except Exception: util.logexc(log) log.warn("Failed to get timeout, using %s" % timeout) def_mdurls = ["http://169.254.169.254", "http://instance-data:8773"] mdurls = mcfg.get("metadata_urls", def_mdurls) # Remove addresses from the list that wont resolve. filtered = [x for x in mdurls if util.is_resolvable_url(x)] if set(filtered) != set(mdurls): log.debug( "Removed the following unresolveable addrs from metadata urls: %s" % list((set(mdurls) - set(filtered))) ) if len(filtered): mdurls = filtered else: log.warn("Empty metadata url list! using default list %s", def_mdurls) mdurls = def_mdurls urls = [] url2base = {} for url in mdurls: cur = "%s/%s/meta-data/instance-id" % (url, self.api_ver) urls.append(cur) url2base[cur] = url starttime = time.time() def status_cb(url, why, details): log.warn("Calling %r failed due to %r: %s", url, why, details) url = wait_for_metadata_service(urls=urls, max_wait=max_wait, timeout=timeout, status_cb=status_cb) if url: log.info("Using metadata source: '%s'" % url2base.get(url)) else: log.critical("Giving up on metadata fetching after %i seconds" % int(time.time() - starttime)) self.metadata_address = url2base.get(url) or False return bool(url)
def status_cb(url, why, details): log.warn("Calling %r failed due to %r: %s", url, why, details)