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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
#
"""ElasticSearch interface class."""
import sys
from datetime import datetime
from glances.logger import logger
from glances.exports.export import GlancesExport
from elasticsearch import Elasticsearch, helpers
class Export(GlancesExport):
"""This class manages the ElasticSearch (ES) export module."""
def __init__(self, config=None, args=None):
"""Init the ES export IF."""
super(Export, self).__init__(config=config, args=args)
# Mandatory configuration keys (additional to host and port)
self.index = None
# Load the ES configuration file
self.export_enable = self.load_conf(
'elasticsearch', mandatories=['scheme', 'host', 'port', 'index'], options=[]
)
if not self.export_enable:
sys.exit(2)
# Init the ES client
self.client = self.init()
def init(self):
"""Init the connection to the ES server."""
if not self.export_enable:
return None
try:
es = Elasticsearch(hosts=['{}://{}:{}'.format(self.scheme, self.host, self.port)])
except Exception as e:
logger.critical(
"Cannot connect to ElasticSearch server %s://%s:%s (%s)" % (self.scheme, self.host, self.port, e)
)
sys.exit(2)
if not es.ping():
logger.critical("Cannot ping the ElasticSearch server %s://%s:%s" % (self.scheme, self.host, self.port))
sys.exit(2)
else:
logger.info("Connected to the ElasticSearch server %s://%s:%s" % (self.scheme, self.host, self.port))
return es
def export(self, name, columns, points):
"""Write the points to the ES server."""
logger.debug("Export {} stats to ElasticSearch".format(name))
# Generate index name with the index field + current day
index = '{}-{}'.format(self.index, datetime.utcnow().strftime("%Y.%m.%d"))
# Create DB input
# https://elasticsearch-py.readthedocs.io/en/master/helpers.html
actions = []
dt_now = datetime.utcnow().isoformat('T')
action = {
"_index": index,
"_id": '{}.{}'.format(name, dt_now),
"_type": 'glances-{}'.format(name),
"_source": {"plugin": name, "timestamp": dt_now},
}
action['_source'].update(zip(columns, [str(p) for p in points]))
actions.append(action)
logger.debug("Exporting the following object to elasticsearch: {}".format(action))
# Write input to the ES index
try:
helpers.bulk(self.client, actions)
except Exception as e:
logger.error("Cannot export {} stats to ElasticSearch ({})".format(name, e))
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