From 8f0fc3af57fab3c1953bfc58f6b3f5a1b07fcd0d Mon Sep 17 00:00:00 2001
From: Erik Arvstedt <erik.arvstedt@gmail.com>
Date: Wed, 13 Jul 2022 12:44:30 +0200
Subject: [PATCH] backend: Add config file env var

---
 backend/README.md     | 5 +++++
 backend/src/config.ts | 6 ++++--
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/backend/README.md b/backend/README.md
index 823998fdc..3d7c23eaa 100644
--- a/backend/README.md
+++ b/backend/README.md
@@ -110,6 +110,11 @@ Run the Mempool backend:
 
 ```
 npm run start
+
+```
+You can also set env var `MEMPOOL_CONFIG_FILE` to specify a custom config file location:
+```
+MEMPOOL_CONFIG_FILE=/path/to/mempool-config.json npm run start
 ```
 
 When it's running, you should see output like this:
diff --git a/backend/src/config.ts b/backend/src/config.ts
index 8c91e104b..43ba16cb3 100644
--- a/backend/src/config.ts
+++ b/backend/src/config.ts
@@ -1,4 +1,6 @@
-const configFile = require('../mempool-config.json');
+const configFromFile = require(
+    process.env.MEMPOOL_CONFIG_FILE ? process.env.MEMPOOL_CONFIG_FILE : '../mempool-config.json'
+);
 
 interface IConfig {
   MEMPOOL: {
@@ -249,7 +251,7 @@ class Config implements IConfig {
   MAXMIND: IConfig['MAXMIND'];
 
   constructor() {
-    const configs = this.merge(configFile, defaults);
+    const configs = this.merge(configFromFile, defaults);
     this.MEMPOOL = configs.MEMPOOL;
     this.ESPLORA = configs.ESPLORA;
     this.ELECTRUM = configs.ELECTRUM;