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# -*- coding: utf-8 -*-
# Description: redis netdata python.d module
# Author: Pawel Krupa (paulfantom)
# Author: Ilya Mashchenko (ilyam8)
# SPDX-License-Identifier: GPL-3.0-or-later
import re
from copy import deepcopy
from bases.FrameworkServices.SocketService import SocketService
REDIS_ORDER = [
'operations',
'hit_rate',
'memory',
'keys_redis',
'eviction',
'net',
'connections',
'clients',
'slaves',
'persistence',
'bgsave_now',
'bgsave_health',
'uptime',
]
PIKA_ORDER = [
'operations',
'hit_rate',
'memory',
'keys_pika',
'connections',
'clients',
'slaves',
'uptime',
]
CHARTS = {
'operations': {
'options': [None, 'Operations', 'operations/s', 'operations', 'redis.operations', 'line'],
'lines': [
['total_commands_processed', 'commands', 'incremental'],
['instantaneous_ops_per_sec', 'operations', 'absolute']
]
},
'hit_rate': {
'options': [None, 'Hit rate', 'percentage', 'hits', 'redis.hit_rate', 'line'],
'lines': [
['hit_rate', 'rate', 'absolute']
]
},
'memory': {
'options': [None, 'Memory utilization', 'KiB', 'memory', 'redis.memory', 'area'],
'lines': [
['maxmemory', 'max', 'absolute', 1, 1024],
['used_memory', 'total', 'absolute', 1, 1024],
['used_memory_lua', 'lua', 'absolute', 1, 1024]
]
},
'net': {
'options': [None, 'Bandwidth', 'kilobits/s', 'network', 'redis.net', 'area'],
'lines': [
['total_net_input_bytes', 'in', 'incremental', 8, 1000],
['total_net_output_bytes', 'out', 'incremental', -8, 1000]
]
},
'keys_redis': {
'options': [None, 'Keys per Database', 'keys', 'keys', 'redis.keys', 'line'],
'lines': []
},
'keys_pika': {
'options': [None, 'Keys', 'keys', 'keys', 'redis.keys', 'line'],
'lines': [
['kv_keys', 'kv', 'absolute'],
['hash_keys', 'hash', 'absolute'],
['list_keys', 'list', 'absolute'],
['zset_keys', 'zset', 'absolute'],
['set_keys', 'set', 'absolute']
]
},
'eviction': {
'options': [None, 'Evicted Keys', 'keys', 'keys', 'redis.eviction', 'line'],
'lines': [
['evicted_keys', 'evicted', 'absolute']
]
},
'connections': {
'options': [None, 'Connections', 'connections/s', 'connections', 'redis.connections', 'line'],
'lines': [
['total_connections_received', 'received', 'incremental', 1],
['rejected_connections', 'rejected', 'incremental', -1]
]
},
'clients': {
'options': [None, 'Clients', 'clients', 'connections', 'redis.clients', 'line'],
'lines': [
['connected_clients', 'connected', 'absolute', 1],
['blocked_clients', 'blocked', 'absolute', -1]
]
},
'slaves': {
'options': [None, 'Slaves', 'slaves', 'replication', 'redis.slaves', 'line'],
'lines': [
['connected_slaves', 'connected', 'absolute']
]
},
'persistence': {
'options': [None, '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']
]
},
'uptime': {
'options': [None, 'Uptime', 'seconds', 'uptime', 'redis.uptime', 'line'],
'lines': [
['uptime_in_seconds', 'uptime', 'absolute']
]
}
}
def copy_chart(name):
return {name: deepcopy(CHARTS[name])}
RE = re.compile(r'\n([a-z_0-9 ]+):(?:keys=)?([^,\r]+)')
class Service(SocketService):
def __init__(self, configuration=None, name=None):
SocketService.__init__(self, configuration=configuration, name=name)
self.order = list()
self.definitions = dict()
self._keep_alive = True
self.host = self.configuration.get('host', 'localhost')
self.port = self.configuration.get('port', 6379)
self.unix_socket = self.configuration.get('socket')
p = self.configuration.get('pass')
self.auth_request = 'AUTH {0} \r\n'.format(p).encode() if p else None
self.request = 'INFO\r\n'.encode()
self.bgsave_time = 0
self.keyspace_dbs = set()
def do_auth(self):
resp = self._get_raw_data(request=self.auth_request)
if not resp:
return False
if resp.strip() != '+OK':
self.error('invalid password')
return False
return True
def get_raw_and_parse(self):
if self.auth_request and not self.do_auth():
return None
resp = self._get_raw_data()
if not resp:
return None
parsed = RE.findall(resp)
if not parsed:
self.error('response is invalid/empty')
return None
return dict((k.replace(' ', '_'), v) for k, v in parsed)
def get_data(self):
"""
Get data from socket
:return: dict
"""
data = self.get_raw_and_parse()
if not data:
return None
self.calc_hit_rate(data)
self.calc_redis_keys(data)
self.calc_redis_rdb_save_operations(data)
return data
@staticmethod
def calc_hit_rate(data):
try:
hits = int(data['keyspace_hits'])
misses = int(data['keyspace_misses'])
data['hit_rate'] = hits * 100 / (hits + misses)
except (KeyError, ZeroDivisionError):
data['hit_rate'] = 0
def calc_redis_keys(self, data):
if not data.get('redis_version'):
return
# db0:keys=2,expires=0,avg_ttl=0
new_keyspace_dbs = [k for k in data if k.startswith('db') and k not in self.keyspace_dbs]
for db in new_keyspace_dbs:
self.keyspace_dbs.add(db)
self.charts['keys_redis'].add_dimension([db, None, 'absolute'])
for db in self.keyspace_dbs:
if db not in data:
data[db] = 0
def calc_redis_rdb_save_operations(self, data):
if not (data.get('redis_version') and data.get('rdb_bgsave_in_progress')):
return
if data['rdb_bgsave_in_progress'] != '0':
self.bgsave_time += self.update_every
else:
self.bgsave_time = 0
data['rdb_last_bgsave_status'] = 0 if data['rdb_last_bgsave_status'] == 'ok' else 1
data['rdb_bgsave_in_progress'] = self.bgsave_time
def check(self):
"""
Parse configuration, check if redis is available, and dynamically create chart lines data
:return: boolean
"""
data = self.get_raw_and_parse()
if not data:
return False
self.order = PIKA_ORDER if data.get('pika_version') else REDIS_ORDER
for n in self.order:
self.definitions.update(copy_chart(n))
return True
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
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