1 files changed, 145 insertions, 0 deletions
diff --git a/src/conf_mode/service_monitoring_prometheus.py b/src/conf_mode/service_monitoring_prometheus.py
new file mode 100755
index 000000000..e0a9fc4ef
--- /dev/null
+++ b/src/conf_mode/service_monitoring_prometheus.py
@@ -0,0 +1,145 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2024 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# 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 <http://www.gnu.org/licenses/>.
+
+import os
+
+from sys import exit
+
+from vyos.config import Config
+from vyos.configdict import is_node_changed
+from vyos.configverify import verify_vrf
+from vyos.template import render
+from vyos.utils.process import call
+from vyos import ConfigError
+from vyos import airbag
+
+
+airbag.enable()
+
+node_exporter_service_file = '/etc/systemd/system/node_exporter.service'
+node_exporter_systemd_service = 'node_exporter.service'
+
+frr_exporter_service_file = '/etc/systemd/system/frr_exporter.service'
+frr_exporter_systemd_service = 'frr_exporter.service'
+
+
+def get_config(config=None):
+    if config:
+        conf = config
+    else:
+        conf = Config()
+    base = ['service', 'monitoring', 'prometheus']
+    if not conf.exists(base):
+        return None
+
+    monitoring = conf.get_config_dict(
+        base, key_mangling=('-', '_'), get_first_key=True, with_recursive_defaults=True
+    )
+
+    tmp = is_node_changed(conf, base + ['node-exporter', 'vrf'])
+    if tmp:
+        monitoring.update({'node_exporter_restart_required': {}})
+
+    tmp = is_node_changed(conf, base + ['frr-exporter', 'vrf'])
+    if tmp:
+        monitoring.update({'frr_exporter_restart_required': {}})
+
+    return monitoring
+
+
+def verify(monitoring):
+    if not monitoring:
+        return None
+
+    if 'node_exporter' in monitoring:
+        verify_vrf(monitoring['node_exporter'])
+
+    if 'frr_exporter' in monitoring:
+        verify_vrf(monitoring['frr_exporter'])
+
+    return None
+
+
+def generate(monitoring):
+    if not monitoring or 'node_exporter' not in monitoring:
+        # Delete systemd files
+        if os.path.isfile(node_exporter_service_file):
+            os.unlink(node_exporter_service_file)
+
+    if not monitoring or 'frr_exporter' not in monitoring:
+        # Delete systemd files
+        if os.path.isfile(frr_exporter_service_file):
+            os.unlink(frr_exporter_service_file)
+
+    if not monitoring:
+        return None
+
+    if 'node_exporter' in monitoring:
+        # Render node_exporter node_exporter_service_file
+        render(
+            node_exporter_service_file,
+            'prometheus/node_exporter.service.j2',
+            monitoring['node_exporter'],
+        )
+
+    if 'frr_exporter' in monitoring:
+        # Render frr_exporter service_file
+        render(
+            frr_exporter_service_file,
+            'prometheus/frr_exporter.service.j2',
+            monitoring['frr_exporter'],
+        )
+
+    return None
+
+
+def apply(monitoring):
+    # Reload systemd manager configuration
+    call('systemctl daemon-reload')
+    if not monitoring or 'node_exporter' not in monitoring:
+        call(f'systemctl stop {node_exporter_systemd_service}')
+    if not monitoring or 'frr_exporter' not in monitoring:
+        call(f'systemctl stop {frr_exporter_systemd_service}')
+
+    if not monitoring:
+        return
+
+    if 'node_exporter' in monitoring:
+        # we need to restart the service if e.g. the VRF name changed
+        systemd_action = 'reload-or-restart'
+        if 'node_exporter_restart_required' in monitoring:
+            systemd_action = 'restart'
+
+        call(f'systemctl {systemd_action} {node_exporter_systemd_service}')
+
+    if 'frr_exporter' in monitoring:
+        # we need to restart the service if e.g. the VRF name changed
+        systemd_action = 'reload-or-restart'
+        if 'frr_exporter_restart_required' in monitoring:
+            systemd_action = 'restart'
+
+        call(f'systemctl {systemd_action} {frr_exporter_systemd_service}')
+
+
+if __name__ == '__main__':
+    try:
+        c = get_config()
+        verify(c)
+        generate(c)
+        apply(c)
+    except ConfigError as e:
+        print(e)
+        exit(1)