def memcached(keys=False, stats=False, clear=False):
"""List memcached stored keys and server stats"""
if 'CACHE_MEMCACHED_SERVERS' in app.config:
servers = app.config['CACHE_MEMCACHED_SERVERS']
pp = pprint.PrettyPrinter(indent=4)
for server in servers:
host, port = server.split(':')
mem = MemcachedStats(host, port)
print '%s' % '=' * 80
print 'SERVER: %s:%s' % (host, port)
if keys:
print 'KEYS:'
pp.pprint(mem.keys())
if stats:
print 'STATS:'
pp.pprint(mem.stats())
# clear keys
if clear:
cache = memcache.Client(servers, debug=0)
if cache.flush_all():
print 'Memcached data flushed'
else:
print 'Could not flush memcached'
else:
print 'There is no memcached servers in the config files'
def persist_hits():
if is_cached_hitcount_enabled() and using_memcache():
backend, location, params = parse_backend_conf(CACHED_HITCOUNT_CACHE)
host, port = location.split(':')
hitcount_cache = get_hitcount_cache()
lock = hitcount_cache.get(CACHED_HITCOUNT_LOCK_KEY)
#print 'persist_hits - check %s lock = %s' % (CACHED_HITCOUNT_LOCK_KEY, lock)
if lock is None or lock != 1:
try:
#acquire a lock so no updates will occur while we are persisting the hits to DB
hitcount_cache.set(CACHED_HITCOUNT_LOCK_KEY, 1,
CACHED_HITCOUNT_CACHE_TIMEOUT)
#print 'acquire %s lock = %s ' % (CACHED_HITCOUNT_LOCK_KEY, hitcount_cache.get(CACHED_HITCOUNT_LOCK_KEY))
mem = MemcachedStats(host, port)
keys = mem.keys()
content_types = {
} #used for keeping track of the content types so DB doesn't have to be queried each time
for cache_key in keys:
if "hitcount__" in cache_key and not CACHED_HITCOUNT_IP_CACHE in cache_key:
cache_key = cache_key.split(
':'
)[-1] #the key is a combination of key_prefix, version and key all separated by : - all we need is the key
count = hitcount_cache.get(cache_key)
if count: #only update the hit count if the is not None
hitcount, ctype_pk, object_pk = cache_key.split(
'__')
if ctype_pk in content_types.keys():
content_type = content_types[ctype_pk]
else:
content_type = ContentType.objects.get(
id=ctype_pk)
content_types[ctype_pk] = content_type
with transaction_atomic():
#save a new hit or increment this hits on an existing hit
hit, created = Hit.objects.select_for_update(
).get_or_create(added=datetime.utcnow().date(),
object_pk=object_pk,
content_type=content_type)
if hit and created:
hit.hits = long(count)
hit.save()
elif hit:
hit.hits = hit.hits + long(count)
hit.save()
#reset the hitcount for this object to 0 - even if it was previously None
hitcount_cache.set(cache_key, 0,
CACHED_HITCOUNT_CACHE_TIMEOUT)
#print 'reset key %s to zero = %s ' % (cache_key, hitcount_cache.get(cache_key))
except Exception, ex:
logger.error('Unable to persist hits')
logger.error(ex)
raise ex
finally:
def get_relevant_keys(self):
cache_stats = MemcachedStats("127.0.0.1", 8001)
all_keys = cache_stats.keys()
relevant_keys = [
key.replace(":1:", "") for key in all_keys
if key.split("|")[0].replace(":1:", "") == str(self.pk)
]
return relevant_keys
def reset_cache_layer(self, layer_key_name):
cache = caches[self.cache_name]
location = self._get_location()
location = location[0] if isinstance(location, list) else location
location = location.split(':')
mem = MemcachedStats(location[0], location[1])
keys = mem.keys()
for key in keys:
if key.startswith('{}/{}/{}'.format(self.memcache_key_prefix, '0',
layer_key_name)):
cache.delete(key)
def stats():
logging.error("Sample error message")
mem = MemcachedStats()
stats_all = mem.stats()
stats_get_hits_rate = float(mem.stats()['get_hits']) / float(
mem.stats()['get_misses']) * 100
stats_memcached_mem_used = mem.stats()['bytes']
var_temp = (float(mem.stats()['bytes']) / 64000000.00) * 100.00
stats_memcached_mem_used_percentage = format(var_temp, '.6f')
return render_template(
"app.html.j2",
placeholder_stats_all=stats_all,
placeholder_stats_get_hits_rate=stats_get_hits_rate,
placeholder_stats_memcached_mem_used=stats_memcached_mem_used,
placeholder_stats_memcached_mem_used_percentage=
stats_memcached_mem_used_percentage)
def get_nip_records_from_cache(nip_pk, nip_name):
mem = MemcachedStats()
nip_uid = "%d_%s" % (nip_pk, nip_name)
relevant_keys = [key for key in mem.keys() if nip_uid in key]
data = {}
for key in relevant_keys:
time = key.splt("_")[2]
data[key] = json.loads(cache.get(key))
return data
def __init__(self, host='localhost', port=11211, *args, **kwargs):
self.client = mc.Client((host, port))
self.client_stats = MemcachedStats(host, port)
super(AnguisMemcached, self).__init__()
