import time
from zope.interface import implements
from twisted.internet import defer
from twisted.python import log
from tensor.interfaces import ITensorSource
from tensor.objects import Source
from tensor.utils import fork
from tensor.aggregators import Counter
[docs]class Queues(Source):
"""Query llen from redis-cli
**Configuration arguments:**
:param queue: Queue name (defaults to 'celery', just because)
:type queue: str.
:param db: DB number
:type db: int.
:param clipath: Path to redis-cli (default: /usr/bin/redis-cli)
:type clipath: str.
**Metrics:**
:(service_name): Queue length
:(service_name): Queue rate
"""
implements(ITensorSource)
def __init__(self, *a, **kw):
Source.__init__(self, *a, **kw)
self.queue = self.config.get('queue', 'celery')
self.db = int(self.config.get('db', 0))
self.clipath = self.config.get('clipath', '/usr/bin/redis-cli')
@defer.inlineCallbacks
def get(self):
out, err, code = yield fork(self.clipath,
args=('-n', str(self.db), 'llen', self.queue,)
)
events = []
if code == 0:
val = int(out.strip('\n').split()[-1])
defer.returnValue([
self.createEvent('ok', '%s queue length' % self.queue, val),
self.createEvent('ok', 'Queue rate', val, prefix='rate',
aggregation=Counter)
])
else:
err = 'Error running %s: %s' % (self.clipath, repr(err))
log.msg(err)
defer.returnValue(
self.createEvent('critical', err, None)
)