Example leakage error correction

package.json

@@ -100,7 +100,7 @@
     "is-localhost-ip": "^1.4.0",
     "isbot": "^5.1.16",
     "kafkajs": "^2.1.0",
-    "maxmind": "^4.3.6",
+    "maxmind": "^4.3.24",
     "md5": "^2.3.0",
     "next": "15.0.4",
     "next-basics": "^0.39.0",

src/lib/detect.ts

@@ -14,7 +14,33 @@ import {
 } from './constants';
 import { NextApiRequestCollect } from 'pages/api/send';
 
-let lookup;
+
+// 1. Initialize lookup OUTSIDE any function, but make it a Promise.
+let lookupPromise: any = null;
+
+// 2. Create an initialization function.
+async function initializeMaxmind() {
+  if (!lookupPromise) {
+    // eslint-disable-next-line no-console
+    console.log('debug: loading GeoLite2-City.mmdb');
+    const dir = path.join(process.cwd(), 'geo');
+    const dbPath = path.resolve(dir, 'GeoLite2-City.mmdb');
+
+    // Use try/catch for error handling during DB loading
+    try {
+      lookupPromise = maxmind.open(dbPath);
+    } catch (error) {
+      console.error("Error loading GeoLite2 database:", error);
+      //  CRITICAL:  You MUST handle the error here.  Throwing an error
+      //  will cause the server to crash, which is better than running
+      //  without the database.
+      throw error;  // Re-throw to prevent the app from starting.
+    }
+  }
+  return lookupPromise;
+}
+
+initializeMaxmind()
 
 export function getIpAddress(req: NextApiRequestCollect) {
   const customHeader = String(process.env.CLIENT_IP_HEADER).toLowerCase();
@@ -107,15 +133,11 @@ export async function getLocation(ip: string, req: NextApiRequestCollect) {
     };
   }
 
-  // Database lookup
-  if (!lookup) {
-    const dir = path.join(process.cwd(), 'geo');
-
-    lookup = await maxmind.open(path.resolve(dir, 'GeoLite2-City.mmdb'));
+  const lookup = await lookupPromise;
+  if (!lookup) { // This check is likely unnecessary, but good for safety.
+    throw new Error("Maxmind database not loaded.");
   }
 
-  const result = lookup.get(ip);
-
   if (result) {
     const country = result.country?.iso_code ?? result?.registered_country?.iso_code;
     const subdivision1 = result.subdivisions?.[0]?.iso_code;

yarn.lock

@@ -7739,10 +7739,10 @@ mathml-tag-names@^2.1.3:
   resolved "https://registry.yarnpkg.com/mathml-tag-names/-/mathml-tag-names-2.1.3.tgz#4ddadd67308e780cf16a47685878ee27b736a0a3"
   integrity sha512-APMBEanjybaPzUrfqU0IMU5I0AswKMH7k8OTLs0vvV4KZpExkTkY87nR/zpbuTPj+gARop7aGUbl11pnDfW6xg==
 
-maxmind@^4.3.6:
-  version "4.3.22"
-  resolved "https://registry.yarnpkg.com/maxmind/-/maxmind-4.3.22.tgz#8168a2d890d88626613b97eeecbb13fabe0074c4"
-  integrity sha512-dfLO11mE77ELTEIXNezfW0eslodsFLsZ1lQkLauP+5Zsg1m7kCGtljqRyVOd9E5Ne2RJgvY6UU09qvnVocOZvA==
+maxmind@^4.3.24:
+  version "4.3.24"
+  resolved "https://registry.yarnpkg.com/maxmind/-/maxmind-4.3.24.tgz#c67a4278777210c857434fa8e82bdd6774e5e661"
+  integrity sha512-dexrLcjfS2xDGOvdV8XcfQYmyQVpGidMwEG2ld19lXlsB+i+lXRWPzQi81HfwRXR4hxzFr5gT0oAIFyqAAb/Ww==
   dependencies:
     mmdb-lib "2.1.1"
     tiny-lru "11.2.11"