优化后端的性能

server/prometheus-service.js

@@ -1,12 +1,15 @@
 const axios = require('axios');
 const http = require('http');
 const https = require('https');
-const cache = require('./cache'); // <-- ADD
+const cache = require('./cache');
+const crypto = require('crypto');
 
 const QUERY_TIMEOUT = 10000;
 
-// Reusable agents to handle potential redirect issues and protocol mismatches
-const crypto = require('crypto');
+function getCacheKey(type, baseUrl, expr, extra = '') {
+  return `prom_${type}:${crypto.createHash('md5').update(`${baseUrl}:${expr}:${extra}`).digest('hex')}`;
+}
+
 const httpAgent = new http.Agent({ keepAlive: true });
 const httpsAgent = new https.Agent({ keepAlive: true });
 
@@ -951,5 +954,6 @@ module.exports = {
       console.error(`[Prometheus] Error fetching latency for ${target}:`, err.message);
       return null;
     }
-  }
+  },
+  getCacheKey
 };