Add Basic Auth for /metrics

server/prometheus.js

@@ -0,0 +1,59 @@
+const PrometheusClient = require('prom-client');
+
+const commonLabels = [
+    'monitor_name',
+    'monitor_type',
+    'monitor_url',
+    'monitor_hostname',
+    'monitor_port',
+]
+
+const monitor_response_time = new PrometheusClient.Gauge({
+    name: 'monitor_response_time',
+    help: 'Monitor Response Time (ms)',
+    labelNames: commonLabels
+});
+
+const monitor_status = new PrometheusClient.Gauge({
+    name: 'monitor_status',
+    help: 'Monitor Status (1 = UP, 0= DOWN)',
+    labelNames: commonLabels
+});
+
+class Prometheus {
+    monitorLabelValues = {}
+
+    constructor(monitor) {
+        this.monitorLabelValues = {
+            monitor_name: monitor.name,
+            monitor_type: monitor.type,
+            monitor_url: monitor.url,
+            monitor_hostname: monitor.hostname,
+            monitor_port: monitor.port
+        }
+    }
+
+    update(heartbeat) {
+        try {
+            monitor_status.set(this.monitorLabelValues, heartbeat.status)
+        } catch (e) {
+            console.error(e)
+        }
+
+        try {
+            if (typeof heartbeat.ping === 'number') {
+                monitor_response_time.set(this.monitorLabelValues, heartbeat.ping)
+            } else {
+                // Is it good?
+                monitor_response_time.set(this.monitorLabelValues, -1)
+            }
+        } catch (e) {
+            console.error(e)
+        }
+    }
+
+}
+
+module.exports = {
+    Prometheus
+}