From 0fb40462514c2379038193d891fe354b6e6a01ab Mon Sep 17 00:00:00 2001
From: form1ca <form1ca@yandex.ru>
Date: Tue, 13 Apr 2021 12:01:54 +0300
Subject: [PATCH] geo load 1 time

---
 lib/request.js | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/lib/request.js b/lib/request.js
index b30a710d..b5fd1e42 100644
--- a/lib/request.js
+++ b/lib/request.js
@@ -49,6 +49,24 @@ export function getDevice(screen, browser, os) {
   }
 }
 
+let lookupGeo;
+let loadingPromise;
+// load geo db only 1 time
+async function loadGeo() {
+  if (lookupGeo) return lookupGeo;
+  if (loadingPromise) return loadingPromise;
+  loadingPromise = new Promise((resolve, reject) =>
+    maxmind
+      .open(path.resolve('./public/geo/GeoLite2-Country.mmdb'))
+      .then(res => {
+        lookupGeo = res;
+        resolve(lookupGeo);
+      })
+      .catch(reject),
+  );
+  return loadingPromise;
+}
+
 export async function getCountry(req, ip) {
   // Cloudflare
   if (req.headers['cf-ipcountry']) {
@@ -61,7 +79,7 @@ export async function getCountry(req, ip) {
   }
 
   // Database lookup
-  const lookup = await maxmind.open(path.resolve('./public/geo/GeoLite2-Country.mmdb'));
+  const lookup = await loadGeo();
 
   const result = lookup.get(ip);