def unseal_and_process_data( cls, sealed_data ):
"""
Unseal data, and then process it.
Make sure no more than one instance of this request is being processed.
"""
locked = cls.processing_lock.acquire( False )
if not locked:
# failed to aquire
return -errno.EAGAIN
config = get_config()
slice_secret = get_cached_slice_secret( config )
if slice_secret is None:
# no secret on file
cls.processing_lock.release()
log.error("No slice secret")
return -errno.EAGAIN
# unseal the data
rc, data_text = unseal_observer_data( slice_secret, sealed_data )
if rc != 0:
# failed to read
cls.processing_lock.release()
log.error("unseal_observer_data rc = %s" % rc)
return -errno.EINVAL
# parse the data
rc, data = observer_cred.parse_observer_data( data_text )
if rc != 0:
# failed to parse
cls.processing_lock.release()
log.error("parse_observer_data rc = %s" % rc)
return -errno.EINVAL
if data is not None:
# start all gateways for this volume
rc = observer_startstop.start_stop_volume( config, data, slice_secret, hostname=config['hostname'], gateway_uid_name=GATEWAY_UID_NAME, gateway_gid_name=GATEWAY_GID_NAME, debug=config['debug'] )
if rc != 0:
log.error("ensure_running rc = %s" % rc)
cls.processing_lock.release()
return rc
def poll_opencloud_volume_data( config, slice_name, volume_name ):
"""
Download, verify, and parse Observer data.
Return (0, data) on success
Return (nonzero, None) on error
"""
url = config['observer_url']
volume_url = os.path.join( url, slice_name, volume_name )
data_str = download_validate_unseal_data( config, volume_url )
if data_str is None:
log.error("Failed to read data from %s" % url)
return None
rc, data = observer_cred.parse_observer_data( data_str )
if rc != 0:
log.error("Failed to read Observer data, rc = %s" % rc )
return None
return data
