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# -*- coding: utf-8 -*-
# Description: memcached netdata python.d module
# Author: Pawel Krupa (paulfantom)
from bases.FrameworkServices.SocketService import SocketService
# default module values (can be overridden per job in `config`)
#update_every = 2
priority = 60000
retries = 60
# default job configuration (overridden by python.d.plugin)
# config = {'local': {
# 'update_every': update_every,
# 'retries': retries,
# 'priority': priority,
# 'host': 'localhost',
# 'port': 11211,
# 'unix_socket': None
# }}
ORDER = ['cache', 'net', 'connections', 'items', 'evicted_reclaimed',
'get', 'get_rate', 'set_rate', 'cas', 'delete', 'increment', 'decrement', 'touch', 'touch_rate']
CHARTS = {
'cache': {
'options': [None, 'Cache Size', 'megabytes', 'cache', 'memcached.cache', 'stacked'],
'lines': [
['avail', 'available', 'absolute', 1, 1048576],
['used', 'used', 'absolute', 1, 1048576]
]},
'net': {
'options': [None, 'Network', 'kilobits/s', 'network', 'memcached.net', 'area'],
'lines': [
['bytes_read', 'in', 'incremental', 8, 1024],
['bytes_written', 'out', 'incremental', -8, 1024]
]},
'connections': {
'options': [None, 'Connections', 'connections/s', 'connections', 'memcached.connections', 'line'],
'lines': [
['curr_connections', 'current', 'incremental'],
['rejected_connections', 'rejected', 'incremental'],
['total_connections', 'total', 'incremental']
]},
'items': {
'options': [None, 'Items', 'items', 'items', 'memcached.items', 'line'],
'lines': [
['curr_items', 'current', 'absolute'],
['total_items', 'total', 'absolute']
]},
'evicted_reclaimed': {
'options': [None, 'Items', 'items', 'items', 'memcached.evicted_reclaimed', 'line'],
'lines': [
['reclaimed', 'reclaimed', 'absolute'],
['evictions', 'evicted', 'absolute']
]},
'get': {
'options': [None, 'Requests', 'requests', 'get ops', 'memcached.get', 'stacked'],
'lines': [
['get_hits', 'hits', 'percent-of-absolute-row'],
['get_misses', 'misses', 'percent-of-absolute-row']
]},
'get_rate': {
'options': [None, 'Rate', 'requests/s', 'get ops', 'memcached.get_rate', 'line'],
'lines': [
['cmd_get', 'rate', 'incremental']
]},
'set_rate': {
'options': [None, 'Rate', 'requests/s', 'set ops', 'memcached.set_rate', 'line'],
'lines': [
['cmd_set', 'rate', 'incremental']
]},
'delete': {
'options': [None, 'Requests', 'requests', 'delete ops', 'memcached.delete', 'stacked'],
'lines': [
['delete_hits', 'hits', 'percent-of-absolute-row'],
['delete_misses', 'misses', 'percent-of-absolute-row'],
]},
'cas': {
'options': [None, 'Requests', 'requests', 'check and set ops', 'memcached.cas', 'stacked'],
'lines': [
['cas_hits', 'hits', 'percent-of-absolute-row'],
['cas_misses', 'misses', 'percent-of-absolute-row'],
['cas_badval', 'bad value', 'percent-of-absolute-row']
]},
'increment': {
'options': [None, 'Requests', 'requests', 'increment ops', 'memcached.increment', 'stacked'],
'lines': [
['incr_hits', 'hits', 'percent-of-absolute-row'],
['incr_misses', 'misses', 'percent-of-absolute-row']
]},
'decrement': {
'options': [None, 'Requests', 'requests', 'decrement ops', 'memcached.decrement', 'stacked'],
'lines': [
['decr_hits', 'hits', 'percent-of-absolute-row'],
['decr_misses', 'misses', 'percent-of-absolute-row']
]},
'touch': {
'options': [None, 'Requests', 'requests', 'touch ops', 'memcached.touch', 'stacked'],
'lines': [
['touch_hits', 'hits', 'percent-of-absolute-row'],
['touch_misses', 'misses', 'percent-of-absolute-row']
]},
'touch_rate': {
'options': [None, 'Rate', 'requests/s', 'touch ops', 'memcached.touch_rate', 'line'],
'lines': [
['cmd_touch', 'rate', 'incremental']
]}
}
class Service(SocketService):
def __init__(self, configuration=None, name=None):
SocketService.__init__(self, configuration=configuration, name=name)
self.request = "stats\r\n"
self.host = "localhost"
self.port = 11211
self._keep_alive = True
self.unix_socket = None
self.order = ORDER
self.definitions = CHARTS
def _get_data(self):
"""
Get data from socket
:return: dict
"""
response = self._get_raw_data()
if response is None:
# error has already been logged
return None
if response.startswith('ERROR'):
self.error("received ERROR")
return None
try:
parsed = response.split("\n")
except AttributeError:
self.error("response is invalid/empty")
return None
# split the response
data = {}
for line in parsed:
if line.startswith('STAT'):
try:
t = line[5:].split(' ')
data[t[0]] = t[1]
except (IndexError, ValueError):
self.debug("invalid line received: " + str(line))
if not data:
self.error("received data doesn't have any records")
return None
# custom calculations
try:
data['avail'] = int(data['limit_maxbytes']) - int(data['bytes'])
data['used'] = int(data['bytes'])
except (KeyError, ValueError, TypeError):
pass
return data
def _check_raw_data(self, data):
if data.endswith('END\r\n'):
self.debug("received full response from memcached")
return True
self.debug("waiting more data from memcached")
return False
def check(self):
"""
Parse configuration, check if memcached is available
:return: boolean
"""
self._parse_config()
data = self._get_data()
if data is None:
return False
return True
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