Add Prometheus metrics

[Feat]: Simple Stats API #1285

.gitignore

@@ -4,3 +4,4 @@
 /src/node_modules
 .DS_Store
 *.swp
+.data

README.md

@@ -8,11 +8,13 @@
 
 You have found the easiest way to install & manage WireGuard on any Linux host!
 
+<!-- markdownlint-disable MD033 -->
 <p align="center">
-  <img src="./assets/screenshot.png" width="802" />
+  <img src="./assets/screenshot.png" alt="screenshot" width="802" />
 </p>
 
 ## Features
+
 * All-in-one: WireGuard + Web UI.
 * Easy installation, simple to use.
 * List, create, edit, delete, enable & disable clients.
@@ -26,6 +28,7 @@ You have found the easiest way to install & manage WireGuard on any Linux host!
 * UI_TRAFFIC_STATS (default off)
 * UI_SHOW_LINKS (default off)
 * WG_ENABLE_EXPIRES_TIME (default off)
+* Prometheus metrics support
 
 ## Requirements
 
@@ -34,7 +37,7 @@ You have found the easiest way to install & manage WireGuard on any Linux host!
 
 ## Versions
 
-We provide more then 1 docker image to get, this will help you decide which one is best for you. <br>
+We provide more then 1 docker image to get, this will help you decide which one is best for you. <br\>
 For **stable** versions instead of nightly or development please read **README** from the **production** branch!
 
 | tag | Branch | Example | Description |
@@ -62,7 +65,7 @@ And log in again.
 
 To automatically install & run wg-easy, simply run:
 
-```
+```bash
   docker run -d \
   --name=wg-easy \
   -e LANG=de \
@@ -87,6 +90,8 @@ To automatically install & run wg-easy, simply run:
 
 The Web UI will now be available on `http://0.0.0.0:51821`.
 
+The Prometheus metrics will now be available on `http://0.0.0.0:51821/metrics`.
+
 > 💡 Your configuration files will be saved in `~/.wg-easy`
 
 WireGuard Easy can be launched with Docker Compose as well - just download
@@ -126,7 +131,7 @@ These options can be configured by setting environment variables using `-e KEY="
 | `UI_SHOW_LINKS` | `false` | `true` | Enable display of a short download link in Web UI |
 | `MAX_AGE` | `0` | `1440` | The maximum age of Web UI sessions in minutes. `0` means that the session will exist until the browser is closed. |
 | `UI_ENABLE_SORT_CLIENTS` | `false` | `true`                         | Enable UI sort clients by name   |
-
+| `ENABLE_PROMETHEUS_METRICS` | `true` | `true`                       | Enable Prometheus metrics |
 
 > If you change `WG_PORT`, make sure to also change the exposed port.
 

docker-compose.dev.yml

@@ -5,7 +5,7 @@ services:
     command: npm run serve
     volumes:
       - ./src/:/app/
-      # - ./data/:/etc/wireguard
+      - ./.data/:/etc/wireguard
     ports:
       - "51820:51820/udp"
       - "51821:51821/tcp"
@@ -13,5 +13,5 @@ services:
       - NET_ADMIN
       - SYS_MODULE
     environment:
-      # - PASSWORD=p
+      # - PASSWORD_HASH=$$2y$$10$$hBCoykrB95WSzuV4fafBzOHWKu9sbyVa34GJr8VV5R/pIelfEMYyG # 'foobar123'
       - WG_HOST=192.168.1.233

docker-compose.yml

@@ -30,6 +30,7 @@ services:
       # - UI_SHOW_LINKS=true
       # - UI_ENABLE_SORT_CLIENTS=true
       # - WG_ENABLE_EXPIRES_TIME=true
+      # - ENABLE_PROMETHEUS_METRICS=false
 
     image: ghcr.io/wg-easy/wg-easy
     container_name: wg-easy

src/config.js

@@ -41,3 +41,4 @@ module.exports.UI_CHART_TYPE = process.env.UI_CHART_TYPE || 0;
 module.exports.UI_SHOW_LINKS = process.env.UI_SHOW_LINKS || 'false';
 module.exports.UI_ENABLE_SORT_CLIENTS = process.env.UI_ENABLE_SORT_CLIENTS || 'false';
 module.exports.WG_ENABLE_EXPIRES_TIME = process.env.WG_ENABLE_EXPIRES_TIME || 'false';
+module.exports.ENABLE_PROMETHEUS_METRICS = process.env.ENABLE_PROMETHEUS_METRICS || 'true';

src/lib/Server.js

@@ -36,6 +36,7 @@ const {
   UI_SHOW_LINKS,
   UI_ENABLE_SORT_CLIENTS,
   WG_ENABLE_EXPIRES_TIME,
+  ENABLE_PROMETHEUS_METRICS,
 } = require('../config');
 
 const requiresPassword = !!PASSWORD_HASH;
@@ -286,6 +287,13 @@ module.exports = class Server {
         const { expireDate } = await readBody(event);
         await WireGuard.updateClientExpireDate({ clientId, expireDate });
         return { success: true };
+      }))
+      .get('/metrics', defineEventHandler(async (event) => {
+        setHeader(event, 'Content-Type', 'text/plain');
+        if (ENABLE_PROMETHEUS_METRICS === 'true') {
+          return WireGuard.getMetrics();
+        }
+        return '';
       }));
 
     const safePathJoin = (base, target) => {

src/lib/WireGuard.js

@@ -398,4 +398,54 @@ Endpoint = ${WG_HOST}:${WG_CONFIG_PORT}`;
     }
   }
 
+  async getMetrics() {
+    const clients = await this.getClients();
+    let wireguardPeerCount = 0;
+    let wireguardEnabledPeersCount = 0;
+    let wireguardConnectedPeersCount = 0;
+    let wireguardSentBytes = '';
+    let wireguardReceivedBytes = '';
+    let wireguardLatestHandshakeSeconds = '';
+    for (const client of Object.values(clients)) {
+      wireguardPeerCount++;
+      if (client.enabled === true) {
+        wireguardEnabledPeersCount++;
+      }
+      if (client.endpoint) {
+        wireguardConnectedPeersCount++;
+      }
+      wireguardSentBytes += `wireguard_sent_bytes{interface="wg0",enabled="${client.enabled}",address="${client.address}",name="${client.name}"} ${Number(client.transferTx)}\n`;
+      wireguardReceivedBytes += `wireguard_received_bytes{interface="wg0",enabled="${client.enabled}",address="${client.address}",name="${client.name}"} ${Number(client.transferRx)}\n`;
+      wireguardLatestHandshakeSeconds += `wireguard_latest_handshake_seconds{interface="wg0",enabled="${client.enabled}",address="${client.address}",name="${client.name}"} ${new Date(client.latestHandshakeAt).getTime() / 1000}\n`;
+    }
+
+    let returnText = '# HELP wg-easy and wireguard metrics\n';
+
+    returnText += '\n# HELP wireguard_configured_peers\n';
+    returnText += '# TYPE wireguard_configured_peers gauge\n';
+    returnText += `wireguard_configured_peers{interface="wg0"} ${Number(wireguardPeerCount)}\n`;
+
+    returnText += '\n# HELP wireguard_enabled_peers\n';
+    returnText += '# TYPE wireguard_enabled_peers gauge\n';
+    returnText += `wireguard_enabled_peers{interface="wg0"} ${Number(wireguardEnabledPeersCount)}\n`;
+
+    returnText += '\n# HELP wireguard_connected_peers\n';
+    returnText += '# TYPE wireguard_connected_peers gauge\n';
+    returnText += `wireguard_connected_peers{interface="wg0"} ${Number(wireguardConnectedPeersCount)}\n`;
+
+    returnText += '\n# HELP wireguard_sent_bytes Bytes sent to the peer\n';
+    returnText += '# TYPE wireguard_sent_bytes counter\n';
+    returnText += `${wireguardSentBytes}`;
+
+    returnText += '\n# HELP wireguard_received_bytes Bytes received from the peer\n';
+    returnText += '# TYPE wireguard_received_bytes counter\n';
+    returnText += `${wireguardReceivedBytes}`;
+
+    returnText += '\n# HELP wireguard_latest_handshake_seconds UNIX timestamp seconds of the last handshake\n';
+    returnText += '# TYPE wireguard_latest_handshake_seconds gauge\n';
+    returnText += `${wireguardLatestHandshakeSeconds}`;
+
+    return returnText;
+  }
+
 };