1 files changed, 127 insertions, 0 deletions
diff --git a/glances/exports/glances_cassandra/__init__.py b/glances/exports/glances_cassandra/__init__.py
new file mode 100644
index 00000000..aa88eb13
--- /dev/null
+++ b/glances/exports/glances_cassandra/__init__.py
@@ -0,0 +1,127 @@
+# -*- coding: utf-8 -*-
+#
+# This file is part of Glances.
+#
+# SPDX-FileCopyrightText: 2022 Nicolas Hennion <nicolas@nicolargo.com>
+#
+# SPDX-License-Identifier: LGPL-3.0-only
+#
+
+"""Cassandra/Scylla interface class."""
+
+import sys
+from datetime import datetime
+from numbers import Number
+
+from glances.logger import logger
+from glances.exports.export import GlancesExport
+
+from cassandra.auth import PlainTextAuthProvider
+from cassandra.cluster import Cluster
+from cassandra.util import uuid_from_time
+from cassandra import InvalidRequest
+
+
+class Export(GlancesExport):
+
+    """This class manages the Cassandra/Scylla export module."""
+
+    def __init__(self, config=None, args=None):
+        """Init the Cassandra export IF."""
+        super(Export, self).__init__(config=config, args=args)
+
+        # Mandatory configuration keys (additional to host and port)
+        self.keyspace = None
+
+        # Optional configuration keys
+        self.protocol_version = 3
+        self.replication_factor = 2
+        self.table = None
+        self.username = None
+        self.password = None
+
+        # Load the Cassandra configuration file section
+        self.export_enable = self.load_conf(
+            'cassandra',
+            mandatories=['host', 'port', 'keyspace'],
+            options=['protocol_version', 'replication_factor', 'table', 'username', 'password'],
+        )
+        if not self.export_enable:
+            sys.exit(2)
+
+        # Init the Cassandra client
+        self.cluster, self.session = self.init()
+
+    def init(self):
+        """Init the connection to the Cassandra server."""
+        if not self.export_enable:
+            return None
+
+        # if username and/or password are not set the connection will try to connect with no auth
+        auth_provider = PlainTextAuthProvider(username=self.username, password=self.password)
+
+        # Cluster
+        try:
+            cluster = Cluster(
+                [self.host],
+                port=int(self.port),
+                protocol_version=int(self.protocol_version),
+                auth_provider=auth_provider,
+            )
+            session = cluster.connect()
+        except Exception as e:
+            logger.critical("Cannot connect to Cassandra cluster '%s:%s' (%s)" % (self.host, self.port, e))
+            sys.exit(2)
+
+        # Keyspace
+        try:
+            session.set_keyspace(self.keyspace)
+        except InvalidRequest:
+            logger.info("Create keyspace {} on the Cassandra cluster".format(self.keyspace))
+            c = "CREATE KEYSPACE %s WITH replication = { 'class': 'SimpleStrategy', 'replication_factor': '%s' }" % (
+                self.keyspace,
+                self.replication_factor,
+            )
+            session.execute(c)
+            session.set_keyspace(self.keyspace)
+
+        logger.info(
+            "Stats will be exported to Cassandra cluster {} ({}) in keyspace {}".format(
+                cluster.metadata.cluster_name, cluster.metadata.all_hosts(), self.keyspace
+            )
+        )
+
+        # Table
+        try:
+            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
+            )
+        except Exception:
+            logger.debug("Cassandra table %s already exist" % self.table)
+
+        return cluster, session
+
+    def export(self, name, columns, points):
+        """Write the points to the Cassandra cluster."""
+        logger.debug("Export {} stats to Cassandra".format(name))
+
+        # Remove non number stats and convert all to float (for Boolean)
+        data = {k: float(v) for (k, v) in dict(zip(columns, points)).iteritems() if isinstance(v, Number)}
+
+        # Write input to the Cassandra table
+        try:
+            stmt = "INSERT INTO {} (plugin, time, stat) VALUES (?, ?, ?)".format(self.table)
+            query = self.session.prepare(stmt)
+            self.session.execute(query, (name, uuid_from_time(datetime.now()), data))
+        except Exception as e:
+            logger.error("Cannot export {} stats to Cassandra ({})".format(name, e))
+
+    def exit(self):
+        """Close the Cassandra export module."""
+        # To ensure all connections are properly closed
+        self.session.shutdown()
+        self.cluster.shutdown()
+        # Call the father method
+        super(Export, self).exit()