Add node monitoring plugin for KeyDB/Redis

node-daemon/plugins/kydb

@@ -0,0 +1,106 @@
+#!/usr/bin/env python3
+
+# kydb.py - PVC Monitoring example plugin for KeyDB/Redis
+# Part of the Parallel Virtual Cluster (PVC) system
+#
+#    Copyright (C) 2018-2023 Joshua M. Boniface <joshua@boniface.me>
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, version 3.
+#
+#    This program 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 General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+#
+###############################################################################
+
+# This script provides an example of a PVC monitoring plugin script. It will create
+# a simple plugin to check the Libvirt daemon instance on the node for operation.
+
+# This script can thus be used as an example or reference implementation of a
+# PVC monitoring pluginscript and expanded upon as required.
+
+# A monitoring plugin script must implement the class "MonitoringPluginScript" which
+# extends "MonitoringPlugin", providing the 3 functions indicated. Detailed explanation
+# of the role of each function is provided in context of the example; see the other
+# examples for more potential uses.
+
+# WARNING:
+#
+# This script will run in the context of the node daemon keepalives as root.
+# DO NOT install untrusted, unvetted plugins under any circumstances.
+
+
+# This import is always required here, as MonitoringPlugin is used by the
+# MonitoringPluginScript class
+from pvcnoded.objects.MonitoringInstance import MonitoringPlugin
+
+
+# A monitoring plugin script must always expose its nice name, which must be identical to
+# the file name
+PLUGIN_NAME = "kydb"
+
+
+# The MonitoringPluginScript class must be named as such, and extend MonitoringPlugin.
+class MonitoringPluginScript(MonitoringPlugin):
+    def setup(self):
+        """
+        setup(): Perform special setup steps during node daemon startup
+
+        This step is optional and should be used sparingly.
+
+        If you wish for the plugin to not kydb in certain conditions, do any checks here
+        and return a non-None failure message to indicate the error.
+        """
+
+        pass
+
+    def run(self, coordinator_state=None):
+        """
+        run(): Perform the check actions and return a PluginResult object
+
+        The {coordinator_state} can be used to check if this is a "primary" coordinator, "secondary" coordinator, or "client" (non-coordinator)
+        """
+
+        # Run any imports first
+        from redis import Redis
+
+        rd_conn = None
+
+        # Set the health delta to 0 (no change)
+        health_delta = 0
+        # Craft a message that can be used by the clients
+        message = "Successfully connected to Libvirtd on localhost"
+
+        # Check the Zookeeper connection
+        try:
+            rd_conn = Redis(host='localhost', port=6379, decode_responses=True)
+            data = rd_conn.info()
+        except Exception as e:
+            health_delta = 50
+            message = f"Failed to connect to KeyDB/Redis: {e}"
+        finally:
+            del rd_conn
+
+        # Set the health delta in our local PluginResult object
+        self.plugin_result.set_health_delta(health_delta)
+
+        # Set the message in our local PluginResult object
+        self.plugin_result.set_message(message)
+
+        # Return our local PluginResult object
+        return self.plugin_result
+
+    def cleanup(self):
+        """
+        cleanup(): Perform special cleanup steps during node daemon termination
+
+        This step is optional and should be used sparingly.
+        """
+
+        pass