1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# Copyright (C) 2019 Nicolargo <nicolas@nicolargo.com>
#
# Glances is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Glances is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""Kafka interface class."""
import sys
from glances.logger import logger
from glances.compat import iteritems
from glances.exports.glances_export import GlancesExport
from kafka import KafkaProducer
import json
class Export(GlancesExport):
"""This class manages the Kafka export module."""
def __init__(self, config=None, args=None):
"""Init the Kafka export IF."""
super(Export, self).__init__(config=config, args=args)
# Mandatories configuration keys (additional to host and port)
self.topic = None
# Optionals configuration keys
self.compression = None
# Load the Kafka configuration file section
self.export_enable = self.load_conf('kafka',
mandatories=['host', 'port', 'topic'],
options=['compression'])
if not self.export_enable:
sys.exit(2)
# Init the kafka client
self.client = self.init()
def init(self):
"""Init the connection to the Kafka server."""
if not self.export_enable:
return None
# Build the server URI with host and port
server_uri = '{}:{}'.format(self.host, self.port)
try:
s = KafkaProducer(bootstrap_servers=server_uri,
value_serializer=lambda v: json.dumps(v).encode('utf-8'),
compression_type=self.compression)
except Exception as e:
logger.critical("Cannot connect to Kafka server %s (%s)" % (server_uri, e))
sys.exit(2)
else:
logger.info("Connected to the Kafka server %s" % server_uri)
return s
def export(self, name, columns, points):
"""Write the points to the kafka server."""
logger.debug("Export {} stats to Kafka".format(name))
# Create DB input
data = dict(zip(columns, points))
# Send stats to the kafka topic
# key=<plugin name>
# value=JSON dict
try:
self.client.send(self.topic,
key=name,
value=data)
except Exception as e:
logger.error("Cannot export {} stats to Kafka ({})".format(name, e))
def exit(self):
"""Close the Kafka export module."""
# To ensure all connections are properly closed
self.client.flush()
self.client.close()
# Call the father method
super(Export, self).exit()
|
