def get_readable_metro_value(pds):
"""
Récupère et retourne une valeur "lisible" de métrologie, c'est à dire avec
trois chiffres significatifs et l'ordre de grandeur.
@param pds: l'indicateur de métrologie
@type pds: C{vigilo.models.tables.perfdatasource.PerfDataSource}
@return: un couple valeur entière, valeur en pourcentage
@rtype: C{tuple}
"""
# doit être chargé après
from vigilo.turbogears.controllers.proxy import get_through_proxy
host = pds.host.name
usage_url = "lastvalue?host=%s&ds=%s" % (
urllib2.quote(host, ''),
urllib2.quote(pds.name, ''),
)
try:
usage_req = get_through_proxy("vigirrd", host, usage_url)
except urllib2.HTTPError:
logging.warning(_("Failed to get URL: %s"),
url("/vigirrd/%s/%s" % (host, usage_url),
qualified=True))
raise
usage = simplejson.load(usage_req)['lastvalue']
try:
usage = float(usage)
if pds.max is not None:
percent = int(usage / float(pds.max) * 100)
else:
percent = None
usage = convert_with_unit(usage)
except (ValueError, TypeError):
LOGGER.warning(_("Failed to convert DS %(ds)s on %(host)s: "
"value was %(value)s (max: %(max)s)"), {
'ds': pds.name,
'host': host,
'value': usage,
'max': pds.max,
})
usage = percent = None
return (usage, percent)
