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# -*- coding: utf-8 -*- |
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# |
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# This file is part of Glances. |
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# |
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# Copyright (C) 2019 Nicolargo <[email protected]> |
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# |
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# Glances is free software; you can redistribute it and/or modify |
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# it under the terms of the GNU Lesser General Public License as published by |
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# the Free Software Foundation, either version 3 of the License, or |
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# (at your option) any later version. |
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# |
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# Glances is distributed in the hope that it will be useful, |
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# but WITHOUT ANY WARRANTY; without even the implied warranty of |
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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# GNU Lesser General Public License for more details. |
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# |
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# You should have received a copy of the GNU Lesser General Public License |
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# along with this program. If not, see <http://www.gnu.org/licenses/>. |
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"""Cassandra/Scylla interface class.""" |
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import sys |
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from datetime import datetime |
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from numbers import Number |
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from glances.logger import logger |
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from glances.exports.glances_export import GlancesExport |
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from glances.compat import iteritems |
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from cassandra.auth import PlainTextAuthProvider |
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from cassandra.cluster import Cluster |
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from cassandra.util import uuid_from_time |
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from cassandra import InvalidRequest |
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class Export(GlancesExport): |
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"""This class manages the Cassandra/Scylla export module.""" |
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def __init__(self, config=None, args=None): |
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"""Init the Cassandra export IF.""" |
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super(Export, self).__init__(config=config, args=args) |
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# Mandatories configuration keys (additional to host and port) |
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self.keyspace = None |
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# Optionals configuration keys |
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self.protocol_version = 3 |
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self.replication_factor = 2 |
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self.table = None |
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self.username = None |
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self.password = None |
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# Load the Cassandra configuration file section |
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self.export_enable = self.load_conf('cassandra', |
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mandatories=['host', 'port', 'keyspace'], |
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options=['protocol_version', |
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'replication_factor', |
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'table', |
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'username', |
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'password']) |
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if not self.export_enable: |
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sys.exit(2) |
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# Init the Cassandra client |
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self.cluster, self.session = self.init() |
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def init(self): |
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"""Init the connection to the Cassandra server.""" |
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if not self.export_enable: |
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return None |
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# if username and/or password are not set the connection will try to connect with no auth |
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auth_provider = PlainTextAuthProvider( |
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username=self.username, password=self.password) |
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# Cluster |
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try: |
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cluster = Cluster([self.host], |
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port=int(self.port), |
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protocol_version=int(self.protocol_version), |
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auth_provider=auth_provider) |
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session = cluster.connect() |
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except Exception as e: |
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logger.critical("Cannot connect to Cassandra cluster '%s:%s' (%s)" % (self.host, self.port, e)) |
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sys.exit(2) |
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# Keyspace |
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try: |
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session.set_keyspace(self.keyspace) |
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except InvalidRequest as e: |
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logger.info("Create keyspace {} on the Cassandra cluster".format(self.keyspace)) |
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c = "CREATE KEYSPACE %s WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': '%s' }" % (self.keyspace, self.replication_factor) |
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session.execute(c) |
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session.set_keyspace(self.keyspace) |
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logger.info( |
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"Stats will be exported to Cassandra cluster {} ({}) in keyspace {}".format( |
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cluster.metadata.cluster_name, cluster.metadata.all_hosts(), self.keyspace)) |
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# Table |
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try: |
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session.execute("CREATE TABLE %s (plugin text, time timeuuid, stat map<text,float>, PRIMARY KEY (plugin, time)) WITH CLUSTERING ORDER BY (time DESC)" % self.table) |
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except Exception: |
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logger.debug("Cassandra table %s already exist" % self.table) |
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return cluster, session |
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def export(self, name, columns, points): |
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"""Write the points to the Cassandra cluster.""" |
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logger.debug("Export {} stats to Cassandra".format(name)) |
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# Remove non number stats and convert all to float (for Boolean) |
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data = {k: float(v) for (k, v) in dict(zip(columns, points)).iteritems() if isinstance(v, Number)} |
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# Write input to the Cassandra table |
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try: |
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stmt = "INSERT INTO {} (plugin, time, stat) VALUES (?, ?, ?)".format(self.table) |
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query = self.session.prepare(stmt) |
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self.session.execute( |
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query, |
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(name, uuid_from_time(datetime.now()), data) |
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) |
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except Exception as e: |
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logger.error("Cannot export {} stats to Cassandra ({})".format(name, e)) |
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def exit(self): |
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"""Close the Cassandra export module.""" |
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# To ensure all connections are properly closed |
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self.session.shutdown() |
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self.cluster.shutdown() |
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# Call the father method |
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super(Export, self).exit() |
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nicolargo /
glances
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