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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
#
# SPDX-License-Identifier: LGPL-3.0-only
#
"""Kafka interface class."""
import sys
from glances.logger import logger
from glances.exports.glances_export import GlancesExport
from glances.globals import json_dumps
from kafka import KafkaProducer
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)
# Mandatory configuration keys (additional to host and port)
self.topic = None
# Optional configuration keys
self.compression = None
self.tags = None
# Load the Kafka configuration file section
self.export_enable = self.load_conf(
'kafka', mandatories=['host', 'port', 'topic'], options=['compression', 'tags']
)
if not self.export_enable:
exit('Missing KAFKA config')
# 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))
if self.tags is not None:
data.update(self.parse_tags(self.tags))
# Send stats to the kafka topic
# key=<plugin name>
# value=JSON dict
try:
self.client.send(
self.topic,
# Kafka key name needs to be bytes #1593
key=name.encode('utf-8'),
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()