From 4c86a56e3e27d5cc50a5917cc8d03e3375a701bf Mon Sep 17 00:00:00 2001
From: Alik Send <aliknoname@gmail.com>
Date: Thu, 29 Jun 2023 15:47:47 +0300
Subject: [PATCH] Allow to specify prefix for value

It can be used to specify some information about instance, that creates lock to understand what system locks specific resource
---
 src/index.ts | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/index.ts b/src/index.ts
index 660de59..add0d57 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -100,6 +100,7 @@ export interface Settings {
   readonly retryDelay: number;
   readonly retryJitter: number;
   readonly automaticExtensionThreshold: number;
+  readonly valuePrefix: string;
 }
 
 // Define default settings.
@@ -109,6 +110,7 @@ const defaultSettings: Readonly<Settings> = {
   retryDelay: 200,
   retryJitter: 100,
   automaticExtensionThreshold: 500,
+  valuePrefix: '',
 };
 
 // Modifyng this object is forbidden.
@@ -232,6 +234,10 @@ export default class Redlock extends EventEmitter {
         typeof settings.automaticExtensionThreshold === "number"
           ? settings.automaticExtensionThreshold
           : defaultSettings.automaticExtensionThreshold,
+      valuePrefix:
+        typeof settings.valuePrefix === "string"
+          ? settings.valuePrefix
+          : defaultSettings.valuePrefix,
     };
 
     // Use custom scripts and script modifiers.
@@ -303,7 +309,7 @@ export default class Redlock extends EventEmitter {
       throw new Error("Duration must be an integer value in milliseconds.");
     }
 
-    const value = this._random();
+    const value = (settings?.valuePrefix ?? this.settings.valuePrefix) + this._random();
 
     try {
       const { attempts, start } = await this._execute(