def get_data_source(self):
if self.datasource is not None:
return True
if self.restore_from_cache():
log.debug("Restored from cached datasource: %s" % self.datasource)
return True
cfglist = self.cfg['datasource_list']
dslist = list_sources(cfglist, self.ds_deps)
dsnames = [f.__name__ for f in dslist]
log.debug("Searching for data source in %s" % dsnames)
for cls in dslist:
ds = cls.__name__
try:
s = cls(sys_cfg=self.cfg)
log.debug("Checking if %r can provide us the needed data.", ds)
if s.get_data():
self.datasource = s
self.datasource_name = ds
return True
except Exception:
log.warn("Get data of %s raised!", ds)
util.logexc(log)
msg = "Did not find data source. Searched classes: %s" % (dsnames)
log.debug(msg)
raise excp.DataSourceNotFoundException(msg)
def handler_handle_part(mod, ctype, filename, payload, frequency):
modfreq = getattr(mod, "frequency", per_instance)
if not (modfreq == per_always or
(frequency == per_instance and modfreq == per_instance)):
return
try:
mod.handle_part(ctype, filename, payload)
except:
util.logexc(log)
def handle(_name, cfg, cloud, log, _args):
if util.get_cfg_option_bool(cfg, "preserve_hostname", False):
log.debug("Option 'preserve_hostname' is set. Not setting hostname.")
return True
(hostname, _fqdn) = util.get_hostname_fqdn(cfg, cloud)
try:
old_name = set_hostname(hostname, log)
if old_name:
prev_fn = "%s/%s" % (cloud.get_cpath('data'), "previous-hostname")
util.write_file(prev_fn, "%s\n" % (old_name), 0644)
except Exception:
util.logexc(log)
log.warn("Failed to set hostname to %s", hostname)
return True
def get_config_obj(self, cfgfile):
try:
cfg = util.read_conf(cfgfile)
except Exception:
log.critical("Failed loading of cloud config '%s'. "
"Continuing with empty config" % cfgfile)
util.logexc(log)
cfg = None
if cfg is None:
cfg = {}
try:
ds_cfg = self.cloud.datasource.get_config_obj()
except Exception:
ds_cfg = {}
cfg = util.mergedict(cfg, ds_cfg)
return util.mergedict(cfg, self.cloud.cfg)
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)
