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# -*- coding: utf-8 -*-
# Description: rethinkdb netdata python.d module
# Author: Ilya Mashchenko (ilyam8)
# SPDX-License-Identifier: GPL-3.0-or-later
try:
import rethinkdb as rdb
HAS_RETHINKDB = True
except ImportError:
HAS_RETHINKDB = False
from bases.FrameworkServices.SimpleService import SimpleService
ORDER = [
'cluster_connected_servers',
'cluster_clients_active',
'cluster_queries',
'cluster_documents',
]
def cluster_charts():
return {
'cluster_connected_servers': {
'options': [None, 'Connected Servers', 'servers', 'cluster', 'rethinkdb.cluster_connected_servers',
'stacked'],
'lines': [
['cluster_servers_connected', 'connected'],
['cluster_servers_missing', 'missing'],
]
},
'cluster_clients_active': {
'options': [None, 'Active Clients', 'clients', 'cluster', 'rethinkdb.cluster_clients_active',
'line'],
'lines': [
['cluster_clients_active', 'active'],
]
},
'cluster_queries': {
'options': [None, 'Queries', 'queries/s', 'cluster', 'rethinkdb.cluster_queries', 'line'],
'lines': [
['cluster_queries_per_sec', 'queries'],
]
},
'cluster_documents': {
'options': [None, 'Documents', 'documents/s', 'cluster', 'rethinkdb.cluster_documents', 'line'],
'lines': [
['cluster_read_docs_per_sec', 'reads'],
['cluster_written_docs_per_sec', 'writes'],
]
},
}
def server_charts(n):
o = [
'{0}_client_connections'.format(n),
'{0}_clients_active'.format(n),
'{0}_queries'.format(n),
'{0}_documents'.format(n),
]
f = 'server {0}'.format(n)
c = {
o[0]: {
'options': [None, 'Client Connections', 'connections', f, 'rethinkdb.client_connections', 'line'],
'lines': [
['{0}_client_connections'.format(n), 'connections'],
]
},
o[1]: {
'options': [None, 'Active Clients', 'clients', f, 'rethinkdb.clients_active', 'line'],
'lines': [
['{0}_clients_active'.format(n), 'active'],
]
},
o[2]: {
'options': [None, 'Queries', 'queries/s', f, 'rethinkdb.queries', 'line'],
'lines': [
['{0}_queries_total'.format(n), 'queries', 'incremental'],
]
},
o[3]: {
'options': [None, 'Documents', 'documents/s', f, 'rethinkdb.documents', 'line'],
'lines': [
['{0}_read_docs_total'.format(n), 'reads', 'incremental'],
['{0}_written_docs_total'.format(n), 'writes', 'incremental'],
]
},
}
return o, c
class Cluster:
def __init__(self, raw):
self.raw = raw
def data(self):
qe = self.raw['query_engine']
return {
'cluster_clients_active': qe['clients_active'],
'cluster_queries_per_sec': qe['queries_per_sec'],
'cluster_read_docs_per_sec': qe['read_docs_per_sec'],
'cluster_written_docs_per_sec': qe['written_docs_per_sec'],
'cluster_servers_connected': 0,
'cluster_servers_missing': 0,
}
class Server:
def __init__(self, raw):
self.name = raw['server']
self.raw = raw
def error(self):
return self.raw.get('error')
def data(self):
qe = self.raw['query_engine']
d = {
'client_connections': qe['client_connections'],
'clients_active': qe['clients_active'],
'queries_total': qe['queries_total'],
'read_docs_total': qe['read_docs_total'],
'written_docs_total': qe['written_docs_total'],
}
return dict(('{0}_{1}'.format(self.name, k), d[k]) for k in d)
# https://pypi.org/project/rethinkdb/2.4.0/
# rdb.RethinkDB() can be used as rdb drop in replacement.
# https://github.com/rethinkdb/rethinkdb-python#quickstart
def get_rethinkdb():
if hasattr(rdb, 'RethinkDB'):
return rdb.RethinkDB()
return rdb
class Service(SimpleService):
def __init__(self, configuration=None, name=None):
SimpleService.__init__(self, configuration=configuration, name=name)
self.order = list(ORDER)
self.definitions = cluster_charts()
self.host = self.configuration.get('host', '127.0.0.1')
self.port = self.configuration.get('port', 28015)
self.user = self.configuration.get('user', 'admin')
self.password = self.configuration.get('password')
self.timeout = self.configuration.get('timeout', 2)
self.rdb = None
self.conn = None
self.alive = True
def check(self):
if not HAS_RETHINKDB:
self.error('"rethinkdb" module is needed to use rethinkdbs.py')
return False
self.debug("rethinkdb driver version {0}".format(rdb.__version__))
self.rdb = get_rethinkdb()
if not self.connect():
return None
stats = self.get_stats()
if not stats:
return None
for v in stats[1:]:
if get_id(v) == 'server':
o, c = server_charts(v['server'])
self.order.extend(o)
self.definitions.update(c)
return True
def get_data(self):
if not self.is_alive():
return None
stats = self.get_stats()
if not stats:
return None
data = dict()
# cluster
data.update(Cluster(stats[0]).data())
# servers
for v in stats[1:]:
if get_id(v) != 'server':
continue
s = Server(v)
if s.error():
data['cluster_servers_missing'] += 1
else:
data['cluster_servers_connected'] += 1
data.update(s.data())
return data
def get_stats(self):
try:
return list(self.rdb.db('rethinkdb').table('stats').run(self.conn).items)
except rdb.errors.ReqlError:
self.alive = False
return None
def connect(self):
try:
self.conn = self.rdb.connect(
host=self.host,
port=self.port,
user=self.user,
password=self.password,
timeout=self.timeout,
)
self.alive = True
return True
except rdb.errors.ReqlError as error:
self.error('Connection to {0}:{1} failed: {2}'.format(self.host, self.port, error))
return False
def reconnect(self):
# The connection is already closed after rdb.errors.ReqlError,
# so we do not need to call conn.close()
if self.connect():
return True
return False
def is_alive(self):
if not self.alive:
return self.reconnect()
return True
def get_id(v):
return v['id'][0]
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