From 4a7d6ff6de218108bb8361577bfc4a2d20be455f Mon Sep 17 00:00:00 2001
From: Lars Strojny <lars@strojny.net>
Date: Tue, 8 Nov 2022 14:28:13 +0100
Subject: [PATCH] Allow configuring the prefix

---
 config.schema.json | 6 ++++++
 src/platform.ts    | 3 ++-
 src/prometheus.ts  | 9 +++++++--
 3 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/config.schema.json b/config.schema.json
index 80a51cc..496e77d 100644
--- a/config.schema.json
+++ b/config.schema.json
@@ -17,6 +17,12 @@
                 "required": false,
                 "default": false
             },
+            "prefix": {
+                "title": "Metrics prefix",
+                "type": "string",
+                "required": false,
+                "default": "homebridge"
+            },
             "port": {
                 "title": "Probe server port",
                 "description": "TCP port for the prometheus probe server to listen to",
diff --git a/src/platform.ts b/src/platform.ts
index 03e7757..ab97f43 100644
--- a/src/platform.ts
+++ b/src/platform.ts
@@ -24,7 +24,7 @@ export class PrometheusExporterPlatform implements IndependentPlatformPlugin {
 
         this.log.debug('Starting probe HTTP server on port %d', this.config.port)
 
-        this.httpServer = new PrometheusServer(this.config.port, this.log, this.config.debug)
+        this.httpServer = new PrometheusServer(this.config.port, this.log, this.config.debug, this.config.prefix)
         serve(this.httpServer)
             .then((httpServerController) => {
                 this.log.debug('HTTP server started on port %d', this.config.port)
@@ -47,6 +47,7 @@ export class PrometheusExporterPlatform implements IndependentPlatformPlugin {
 
         this.config.debug = this.config.debug ?? false
         this.config.port = this.config.port ?? 36123
+        this.config.prefix = this.config.prefix ?? 'homebridge'
         this.config.refresh_interval = this.config.refresh_interval || 60
         this.config.request_timeout = this.config.request_timeout || 10
         this.config.discovery_timeout = this.config.discovery_timeout || 20
diff --git a/src/prometheus.ts b/src/prometheus.ts
index e54270b..ba8a1a8 100644
--- a/src/prometheus.ts
+++ b/src/prometheus.ts
@@ -78,7 +78,12 @@ export class PrometheusServer implements HttpServer {
     private metricsInitialized = false
     private metrics: Metric[] = []
 
-    constructor(public readonly port: number, public readonly log: Logger, public readonly debug: boolean) {}
+    constructor(
+        public readonly port: number,
+        public readonly log: Logger,
+        public readonly debug: boolean,
+        private readonly prefix: string,
+    ) {}
 
     onRequest(): HttpResponse | undefined {
         if (!this.metricsInitialized) {
@@ -91,7 +96,7 @@ export class PrometheusServer implements HttpServer {
     }
 
     onMetrics(): HttpResponse {
-        const renderer = new MetricsRenderer('homebridge')
+        const renderer = new MetricsRenderer(this.prefix)
         const metrics = this.metrics.map((metric) => renderer.render(metric)).join('\n')
 
         return {