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# -*- coding: utf-8 -*-
#
# This file is part of Glances.
#
# Copyright (C) 2018 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/>.
"""CouchDB interface class."""
import sys
from datetime import datetime
from glances.logger import logger
from glances.exports.glances_export import GlancesExport
import couchdb
import couchdb.mapping
class Export(GlancesExport):
"""This class manages the CouchDB export module."""
def __init__(self, config=None, args=None):
"""Init the CouchDB export IF."""
super(Export, self).__init__(config=config, args=args)
# Mandatories configuration keys (additional to host and port)
self.db = None
# Optionals configuration keys
self.user = None
self.password = None
# Load the Cassandra configuration file section
self.export_enable = self.load_conf('couchdb',
mandatories=['host', 'port', 'db'],
options=['user', 'password'])
if not self.export_enable:
sys.exit(2)
# Init the CouchDB client
self.client = self.init()
def init(self):
"""Init the connection to the CouchDB server."""
if not self.export_enable:
return None
if self.user is None:
server_uri = 'http://{}:{}/'.format(self.host,
self.port)
else:
server_uri = 'http://{}:{}@{}:{}/'.format(self.user,
self.password,
self.host,
self.port)
try:
s = couchdb.Server(server_uri)
except Exception as e:
logger.critical("Cannot connect to CouchDB server %s (%s)" % (server_uri, e))
sys.exit(2)
else:
logger.info("Connected to the CouchDB server %s" % server_uri)
try:
s[self.db]
except Exception as e:
# Database did not exist
# Create it...
s.create(self.db)
else:
logger.info("There is already a %s database" % self.db)
return s
def database(self):
"""Return the CouchDB database object"""
return self.client[self.db]
def export(self, name, columns, points):
"""Write the points to the CouchDB server."""
logger.debug("Export {} stats to CouchDB".format(name))
# Create DB input
data = dict(zip(columns, points))
# Set the type to the current stat name
data['type'] = name
data['time'] = couchdb.mapping.DateTimeField()._to_json(datetime.now())
# Write input to the CouchDB database
# Result can be view: http://127.0.0.1:5984/_utils
try:
self.client[self.db].save(data)
except Exception as e:
logger.error("Cannot export {} stats to CouchDB ({})".format(name, e))
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