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# -*- coding: utf-8 -*-
# Description: redis netdata python.d module
# Author: Pawel Krupa (paulfantom)
from bases.FrameworkServices.SocketService import SocketService
# default module values (can be overridden per job in `config`)
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': 6379,
# 'unix_socket': None
# }}
ORDER = ['operations', 'hit_rate', 'memory', 'keys', 'net', 'connections', 'clients', 'slaves', 'persistence',
'bgsave_now', 'bgsave_health']
CHARTS = {
'operations': {
'options': [None, 'Redis Operations', 'operations/s', 'operations', 'redis.operations', 'line'],
'lines': [
['total_commands_processed', 'commands', 'incremental'],
['instantaneous_ops_per_sec', 'operations', 'absolute']
]},
'hit_rate': {
'options': [None, 'Redis Hit rate', 'percent', 'hits', 'redis.hit_rate', 'line'],
'lines': [
['hit_rate', 'rate', 'absolute']
]},
'memory': {
'options': [None, 'Redis Memory utilization', 'kilobytes', 'memory', 'redis.memory', 'line'],
'lines': [
['used_memory', 'total', 'absolute', 1, 1024],
['used_memory_lua', 'lua', 'absolute', 1, 1024]
]},
'net': {
'options': [None, 'Redis Bandwidth', 'kilobits/s', 'network', 'redis.net', 'area'],
'lines': [
['total_net_input_bytes', 'in', 'incremental', 8, 1024],
['total_net_output_bytes', 'out', 'incremental', -8, 1024]
]},
'keys': {
'options': [None, 'Redis Keys per Database', 'keys', 'keys', 'redis.keys', 'line'],
'lines': [
# lines are created dynamically in `check()` method
]},
'connections': {
'options': [None, 'Redis Connections', 'connections/s', 'connections', 'redis.connections', 'line'],
'lines': [
['total_connections_received', 'received', 'incremental', 1],
['rejected_connections', 'rejected', 'incremental', -1]
]},
'clients': {
'options': [None, 'Redis Clients', 'clients', 'connections', 'redis.clients', 'line'],
'lines': [
['connected_clients', 'connected', 'absolute', 1],
['blocked_clients', 'blocked', 'absolute', -1]
]},
'slaves': {
'options': [None, 'Redis Slaves', 'slaves', 'replication', 'redis.slaves', 'line'],
'lines': [
['connected_slaves', 'connected', 'absolute']
]},
'persistence': {
'options': [None, 'Redis Persistence Changes Since Last Save', 'changes', 'persistence',
'redis.rdb_changes', 'line'],
'lines': [
['rdb_changes_since_last_save', 'changes', 'absolute']
]},
'bgsave_now': {
'options': [None, 'Duration of the RDB Save Operation', 'seconds', 'persistence',
'redis.bgsave_now', 'absolute'],
'lines': [
['rdb_bgsave_in_progress', 'rdb save', 'absolute']
]},
'bgsave_health': {
'options': [None, 'Status of the Last RDB Save Operation', 'status', 'persistence',
'redis.bgsave_health', 'line'],
'lines': [
['rdb_last_bgsave_status', 'rdb save', 'absolute']
]}
}
class Service(SocketService):
def __init__(self, configuration=None, name=None):
SocketService.__init__(self, configuration=configuration, name=name)
self.order = ORDER
self.definitions = CHARTS
self._keep_alive = True
self.chart_name = ""
self.host = self.configuration.get('host', 'localhost')
self.port = self.configuration.get('port', 6379)
self.unix_socket = self.configuration.get('socket')
password = self.configuration.get('pass', str())
self.bgsave_time = 0
self.requests = dict(request='INFO\r\n'.encode(),
password=' '.join(['AUTH', password, '\r\n']).encode() if password else None)
self.request = self.requests['request']
def _get_data(self):
"""
Get data from socket
:return: dict
"""
if self.requests['password']:
self.request = self.requests['password']
raw = self._get_raw_data().strip()
if raw != "+OK":
self.error("invalid password")
return None
self.request = self.requests['request']
response = self._get_raw_data()
if response is None:
# error has already been logged
return None
try:
parsed = response.split("\n")
except AttributeError:
self.error("response is invalid/empty")
return None
data = dict()
for line in parsed:
if len(line) < 5 or line[0] == '$' or line[0] == '#':
continue
if line.startswith('db'):
tmp = line.split(',')[0].replace('keys=', '')
record = tmp.split(':')
data[record[0]] = record[1]
continue
try:
t = line.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
try:
data['hit_rate'] = (int(data['keyspace_hits']) * 100) / (int(data['keyspace_hits'])
+ int(data['keyspace_misses']))
except (KeyError, ZeroDivisionError, TypeError):
data['hit_rate'] = 0
if data['rdb_bgsave_in_progress'] != '0\r':
self.bgsave_time += self.update_every
else:
self.bgsave_time = 0
data['rdb_last_bgsave_status'] = 0 if data['rdb_last_bgsave_status'] == 'ok\r' else 1
data['rdb_bgsave_in_progress'] = self.bgsave_time
return data
def _check_raw_data(self, data):
"""
Check if all data has been gathered from socket.
Parse first line containing message length and check against received message
:param data: str
:return: boolean
"""
length = len(data)
supposed = data.split('\n')[0][1:-1]
offset = len(supposed) + 4 # 1 dollar sing, 1 new line character + 1 ending sequence '\r\n'
if not supposed.isdigit():
return True
supposed = int(supposed)
if length - offset >= supposed:
self.debug("received full response from redis")
return True
self.debug("waiting more data from redis")
return False
def check(self):
"""
Parse configuration, check if redis is available, and dynamically create chart lines data
:return: boolean
"""
data = self._get_data()
if data is None:
return False
for name in data:
if name.startswith('db'):
self.definitions['keys']['lines'].append([name, None, 'absolute'])
return True
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