auto: session-start commit — 2 file(s) at 2026-05-24 20:20:21

containers/libreportal/backend/routes/routes.js

@@ -15,6 +15,7 @@ const authRoutes = require('./auth-routes.js');
 const taskRoutes = require('./task-routes.js');
 const serviceRoutes = require('./service-routes.js');
 const setupRoutes = require('./setup-routes.js');
+const systemRoutes = require('./system-routes.js');
 const { testConnection } = require('../utils/mail.js');
 
 module.exports = {
@@ -30,6 +31,7 @@ module.exports = {
     app.use('/api/tasks', taskRoutes); // requireAuth applied per-route inside
     app.use('/api/apps', serviceRoutes); // requireAuth applied per-route inside
     app.use('/api/setup', setupRoutes); // requireAuth applied per-route inside
+    app.use('/api/system', requireAuth, systemRoutes); // live host metrics (/proc)
     app.post('/api/test-mail-connection', requireAuth, testConnection);
 
     app.post('/api/gluetun/mullvad-wireguard', requireAuth, async (req, res) => {

containers/libreportal/backend/routes/system-routes.js

@@ -0,0 +1,105 @@
+// Live system metrics — the fast path behind the Admin → System gauges.
+//
+// The periodic, host-side picture (disk, network, docker, per-app, 24h history)
+// is produced by the webui_system_metrics generator into frontend/data/system/.
+// This endpoint exists only to make the headline gauges *tick* every couple of
+// seconds, so it is deliberately the cheapest, safest thing it can be:
+//   - reads only /proc (no subprocess spawn, no docker, no privileges)
+//   - CPU% from an in-memory delta of the previous /proc/stat read
+//   - a single-flight + short cache so N open tabs cause ~1 /proc read/sec
+//
+// Namespace note: this runs *inside* the libreportal container. /proc/stat,
+// /proc/meminfo and /proc/loadavg are not namespaced, so they report host-wide
+// values that match the generator's numbers. /proc/net/dev IS per-netns (it
+// would show only this container's traffic), so network is intentionally left
+// to the host-side generator and not served here.
+const express = require('express');
+const fs = require('fs').promises;
+const os = require('os');
+
+const router = express.Router();
+
+const CORES = os.cpus().length || 1;
+const MIN_INTERVAL_MS = 750;   // serve cache to anything faster than this
+
+let prevCpu = null;            // { total, idle } from the last read
+let cache = null;              // { sample, at }
+let inflight = null;           // dedupe concurrent cache-miss reads
+
+async function readCpu() {
+    const data = await fs.readFile('/proc/stat', 'utf8');
+    const first = data.split('\n', 1)[0];                 // "cpu  u n s i io irq sirq steal ..."
+    const n = first.trim().split(/\s+/).slice(1).map(Number);
+    const idle = (n[3] || 0) + (n[4] || 0);               // idle + iowait
+    const total = n.reduce((a, b) => a + (b || 0), 0);
+    return { total, idle };
+}
+
+async function readMem() {
+    const data = await fs.readFile('/proc/meminfo', 'utf8');
+    const m = {};
+    for (const line of data.split('\n')) {
+        const mm = line.match(/^(\w+):\s+(\d+)/);
+        if (mm) m[mm[1]] = parseInt(mm[2], 10) * 1024;    // kB -> bytes
+    }
+    const total = m.MemTotal || 0;
+    const available = m.MemAvailable || 0;
+    const used = Math.max(0, total - available);
+    const swapTotal = m.SwapTotal || 0;
+    const swapUsed = Math.max(0, swapTotal - (m.SwapFree || 0));
+    return {
+        total, used, available,
+        percent: total ? +(used / total * 100).toFixed(1) : 0,
+        swap_total: swapTotal, swap_used: swapUsed,
+        swap_percent: swapTotal ? +(swapUsed / swapTotal * 100).toFixed(1) : 0
+    };
+}
+
+async function readLoad() {
+    const data = await fs.readFile('/proc/loadavg', 'utf8');
+    const [l1, l5, l15] = data.trim().split(/\s+/).map(Number);
+    return { load1: l1 || 0, load5: l5 || 0, load15: l15 || 0 };
+}
+
+async function sample() {
+    const [cpuNow, memory, load] = await Promise.all([readCpu(), readMem(), readLoad()]);
+    let percent = 0;
+    if (prevCpu) {
+        const dt = cpuNow.total - prevCpu.total;
+        const di = cpuNow.idle - prevCpu.idle;
+        if (dt > 0) percent = +Math.max(0, Math.min(100, (1 - di / dt) * 100)).toFixed(1);
+    }
+    prevCpu = cpuNow;
+    return {
+        cpu: {
+            percent,
+            cores: CORES,
+            load1: load.load1, load5: load.load5, load15: load.load15,
+            load1_percent: +Math.min(100, load.load1 / CORES * 100).toFixed(1)
+        },
+        memory,
+        t: Date.now()
+    };
+}
+
+router.get('/live', async (req, res) => {
+    const now = Date.now();
+    if (cache && (now - cache.at) < MIN_INTERVAL_MS) {
+        res.set('Cache-Control', 'no-store');
+        return res.json(cache.sample);
+    }
+    try {
+        if (!inflight) {
+            inflight = sample()
+                .then((s) => { cache = { sample: s, at: Date.now() }; return s; })
+                .finally(() => { inflight = null; });
+        }
+        const s = await inflight;
+        res.set('Cache-Control', 'no-store');
+        res.json(s);
+    } catch (err) {
+        res.status(500).json({ error: 'metrics_unavailable' });
+    }
+});
+
+module.exports = router;