Initial commit

files/opnsense-dhcp-exporter

@@ -0,0 +1,36 @@
+#!/usr/bin/python3
+import time
+import urllib3
+import requests
+import json
+import os
+from prometheus_client import start_http_server, PROCESS_COLLECTOR, PLATFORM_COLLECTOR, GC_COLLECTOR
+from prometheus_client.core import GaugeMetricFamily, CounterMetricFamily, REGISTRY
+from prometheus_client.registry import Collector
+
+urllib3.disable_warnings()
+
+class CustomCollector(Collector):
+    def collect(self):
+        api_host = os.environ['OPNSENSE_EXPORTER_OPS_API']
+        api_key = os.environ['OPNSENSE_EXPORTER_OPS_API_KEY']
+        api_secret = os.environ['OPNSENSE_EXPORTER_OPS_API_SECRET']
+        result = requests.get(f'https://{api_host}/api/dhcpv4/leases/searchLease', verify=False, auth=(api_key, api_secret))
+        leases = {}
+        for lease in result.json()['rows']:
+            if lease['state'] == 'active' and lease['type'] == 'dynamic':
+                leases.setdefault(lease['if_descr'], set()).add(lease['mac'])
+        opnsense_dhcpv4_active_leases_count = GaugeMetricFamily('opnsense_dhcpv4_active_leases_count', 'Number of active DHCPv4 leases per interface', labels=['interface'])
+        for if_descr, macs in leases.items():
+          opnsense_dhcpv4_active_leases_count.add_metric([if_descr], len(macs))
+        yield opnsense_dhcpv4_active_leases_count
+
+REGISTRY.unregister(PROCESS_COLLECTOR)
+REGISTRY.unregister(PLATFORM_COLLECTOR)
+REGISTRY.unregister(GC_COLLECTOR)
+REGISTRY.register(CustomCollector())
+
+if __name__ == '__main__':
+  start_http_server(addr='127.0.0.1', port=int(os.environ['OPNSENSE_DHCP_EXPORTER_PORT']))
+  while True:
+    time.sleep(100)