From a079399759fac31e183002563380cf3cc40d1e08 Mon Sep 17 00:00:00 2001
From: Overtorment <overtorment@gmail.com>
Date: Mon, 3 Aug 2020 13:00:29 +0100
Subject: [PATCH] FIX: race condition in generateAddress (closes #93)

---
 class/User.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/class/User.js b/class/User.js
index ba27c97..1c043ea 100644
--- a/class/User.js
+++ b/class/User.js
@@ -107,6 +107,12 @@ export class User {
    * @returns {Promise<any>}
    */
   async generateAddress() {
+    let lock = new Lock(this._redis, 'generating_address_' + this._userid);
+    if (!(await lock.obtainLock())) {
+      // someone's already generating address
+      return;
+    }
+
     let self = this;
     return new Promise(function(resolve, reject) {
       self._lightning.newAddress({ type: 0 }, async function(err, response) {