添加valkey support

.env.example

@@ -1,13 +1,10 @@
-# MySQL Configuration
-MYSQL_HOST=localhost
-MYSQL_PORT=3306
-MYSQL_USER=root
-MYSQL_PASSWORD=your_password
-MYSQL_DATABASE=display_wall
-
-# Server Configuration
 HOST=0.0.0.0
 PORT=3000
-
-# Data refresh interval (ms)
 REFRESH_INTERVAL=5000
+
+# Valkey/Redis Cache Configuration
+VALKEY_HOST=localhost
+VALKEY_PORT=6379
+VALKEY_PASSWORD=
+VALKEY_DB=dashboard
+VALKEY_TTL=30

Install.sh

@@ -67,9 +67,9 @@ RestartSec=10
 StandardOutput=syslog
 StandardError=syslog
 SyslogIdentifier=data-wall
+# Pass environment via .env file injection for flexibility
+EnvironmentFile=-$PROJECT_DIR/.env
 Environment=NODE_ENV=production
-Environment=PORT=3000
-# If you have specific env vars in .env, they will be loaded by the app's dotenv.config()
 
 [Install]
 WantedBy=multi-user.target

package-lock.json

@@ -12,9 +12,16 @@
         "cors": "^2.8.5",
         "dotenv": "^16.4.0",
         "express": "^4.21.0",
+        "ioredis": "^5.10.1",
         "mysql2": "^3.11.0"
       }
     },
+    "node_modules/@ioredis/commands": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/@ioredis/commands/-/commands-1.5.1.tgz",
+      "integrity": "sha512-JH8ZL/ywcJyR9MmJ5BNqZllXNZQqQbnVZOqpPQqE1vHiFgAw4NHbvE0FOduNU8IX9babitBT46571OnPTT0Zcw==",
+      "license": "MIT"
+    },
     "node_modules/@types/node": {
       "version": "25.5.2",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-25.5.2.tgz",
@@ -132,6 +139,15 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/cluster-key-slot": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/cluster-key-slot/-/cluster-key-slot-1.1.2.tgz",
+      "integrity": "sha512-RMr0FhtfXemyinomL4hrWcYJxmX6deFdCxpJzhDttxgO1+bcCnkk+9drydLVDmAMG7NE6aN/fl4F7ucU/90gAA==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/combined-stream": {
       "version": "1.0.8",
       "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
@@ -606,6 +622,53 @@
       "integrity": "sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==",
       "license": "ISC"
     },
+    "node_modules/ioredis": {
+      "version": "5.10.1",
+      "resolved": "https://registry.npmjs.org/ioredis/-/ioredis-5.10.1.tgz",
+      "integrity": "sha512-HuEDBTI70aYdx1v6U97SbNx9F1+svQKBDo30o0b9fw055LMepzpOOd0Ccg9Q6tbqmBSJaMuY0fB7yw9/vjBYCA==",
+      "license": "MIT",
+      "dependencies": {
+        "@ioredis/commands": "1.5.1",
+        "cluster-key-slot": "^1.1.0",
+        "debug": "^4.3.4",
+        "denque": "^2.1.0",
+        "lodash.defaults": "^4.2.0",
+        "lodash.isarguments": "^3.1.0",
+        "redis-errors": "^1.2.0",
+        "redis-parser": "^3.0.0",
+        "standard-as-callback": "^2.1.0"
+      },
+      "engines": {
+        "node": ">=12.22.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/ioredis"
+      }
+    },
+    "node_modules/ioredis/node_modules/debug": {
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
+      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
+      "license": "MIT",
+      "dependencies": {
+        "ms": "^2.1.3"
+      },
+      "engines": {
+        "node": ">=6.0"
+      },
+      "peerDependenciesMeta": {
+        "supports-color": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/ioredis/node_modules/ms": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
+      "license": "MIT"
+    },
     "node_modules/ipaddr.js": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.1.tgz",
@@ -621,6 +684,18 @@
       "integrity": "sha512-Ks/IoX00TtClbGQr4TWXemAnktAQvYB7HzcCxDGqEZU6oCmb2INHuOoKxbtR+HFkmYWBKv/dOZtGRiAjDhj92g==",
       "license": "MIT"
     },
+    "node_modules/lodash.defaults": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/lodash.defaults/-/lodash.defaults-4.2.0.tgz",
+      "integrity": "sha512-qjxPLHd3r5DnsdGacqOMU6pb/avJzdh9tFX2ymgoZE27BmjXrNy/y4LoaiTeAb+O3gL8AfpJGtqfX/ae2leYYQ==",
+      "license": "MIT"
+    },
+    "node_modules/lodash.isarguments": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/lodash.isarguments/-/lodash.isarguments-3.1.0.tgz",
+      "integrity": "sha512-chi4NHZlZqZD18a0imDHnZPrDeBbTtVN7GXMwuGdRH9qotxAjYs3aVLKc7zNOG9eddR5Ksd8rvFEBc9SsggPpg==",
+      "license": "MIT"
+    },
     "node_modules/long": {
       "version": "5.3.2",
       "resolved": "https://registry.npmjs.org/long/-/long-5.3.2.tgz",
@@ -885,6 +960,27 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/redis-errors": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/redis-errors/-/redis-errors-1.2.0.tgz",
+      "integrity": "sha512-1qny3OExCf0UvUV/5wpYKf2YwPcOqXzkwKKSmKHiE6ZMQs5heeE/c8eXK+PNllPvmjgAbfnsbpkGZWy8cBpn9w==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=4"
+      }
+    },
+    "node_modules/redis-parser": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/redis-parser/-/redis-parser-3.0.0.tgz",
+      "integrity": "sha512-DJnGAeenTdpMEH6uAJRK/uiyEIH9WVsUmoLwzudwGJUwZPp80PDBWPHXSAGNPwNvIXAbe7MSUB1zQFugFml66A==",
+      "license": "MIT",
+      "dependencies": {
+        "redis-errors": "^1.0.0"
+      },
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/safe-buffer": {
       "version": "5.2.1",
       "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.2.1.tgz",
@@ -1049,6 +1145,12 @@
         "url": "https://github.com/mysqljs/sql-escaper?sponsor=1"
       }
     },
+    "node_modules/standard-as-callback": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/standard-as-callback/-/standard-as-callback-2.1.0.tgz",
+      "integrity": "sha512-qoRRSyROncaz1z0mvYqIE4lCd9p2R90i6GxW3uZv5ucSu8tU7B5HXUP1gG8pVZsYNVaXjk8ClXHPttLyxAL48A==",
+      "license": "MIT"
+    },
     "node_modules/statuses": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",

package.json

@@ -13,6 +13,7 @@
     "cors": "^2.8.5",
     "dotenv": "^16.4.0",
     "express": "^4.21.0",
+    "ioredis": "^5.10.1",
     "mysql2": "^3.11.0"
   }
 }

server/cache.js

@@ -0,0 +1,59 @@
+const Redis = require('ioredis');
+
+const host = process.env.VALKEY_HOST || 'localhost';
+const port = parseInt(process.env.VALKEY_PORT) || 6379;
+const password = process.env.VALKEY_PASSWORD || undefined;
+const db = parseInt(process.env.VALKEY_DB) || 0;
+const ttl = parseInt(process.env.VALKEY_TTL) || 30;
+
+let redis = null;
+
+try {
+  redis = new Redis({
+    host,
+    port,
+    password,
+    db,
+    lazyConnect: true,
+    maxRetriesPerRequest: 1
+  });
+
+  redis.on('error', (err) => {
+    // Fail silently after one retry, we just won't cache
+    console.warn('[Cache] Valkey connection failed, caching disabled:', err.message);
+  });
+} catch (err) {
+  console.warn('[Cache] Valkey init failed:', err.message);
+}
+
+const cache = {
+  async get(key) {
+    if (!redis) return null;
+    try {
+      const data = await redis.get(key);
+      return data ? JSON.parse(data) : null;
+    } catch (e) {
+      return null;
+    }
+  },
+
+  async set(key, value, customTtl = ttl) {
+    if (!redis) return;
+    try {
+      await redis.set(key, JSON.stringify(value), 'EX', customTtl);
+    } catch (e) {
+      // ignore
+    }
+  },
+
+  async del(key) {
+    if (!redis) return;
+    try {
+      await redis.del(key);
+    } catch (e) {
+      // ignore
+    }
+  }
+};
+
+module.exports = cache;

server/index.js

@@ -4,6 +4,7 @@ const cors = require('cors');
 const path = require('path');
 const db = require('./db');
 const prometheusService = require('./prometheus-service');
+const cache = require('./cache');
 const checkAndFixDatabase = require('./db-integrity-check');
 
 const app = express();
@@ -462,12 +463,20 @@ app.get('/api/metrics/overview', async (req, res) => {
       });
     }
 
-    const allMetrics = await Promise.all(sources.map(source =>
+    const allMetrics = await Promise.all(sources.map(async (source) => {
-      prometheusService.getOverviewMetrics(source.url, source.name).catch(err => {
+      const cacheKey = `source_metrics:${source.url}:${source.name}`;
+      const cached = await cache.get(cacheKey);
+      if (cached) return cached;
+
+      try {
+        const metrics = await prometheusService.getOverviewMetrics(source.url, source.name);
+        await cache.set(cacheKey, metrics, 15); // Cache for 15s
+        return metrics;
+      } catch (err) {
         console.error(`Error fetching metrics from ${source.name}:`, err.message);
         return null;
-      })
+      }
-    ));
+    }));
 
     const validMetrics = allMetrics.filter(m => m !== null);