fix: wait for the old gamepack task to finish before submitting new

Author: Z-Kris

proxy/src/main/kotlin/net/rsprox/proxy/http/GamePackProvider.kt

@@ -3,6 +3,7 @@ package net.rsprox.proxy.http
 import java.net.HttpURLConnection
 import java.net.URL
 import java.util.concurrent.ForkJoinPool
+import java.util.concurrent.ForkJoinTask
 import kotlin.random.Random
 import kotlin.random.nextInt
 import kotlin.time.Duration.Companion.minutes
@@ -11,13 +12,22 @@ import kotlin.time.TimeSource
 public class GamePackProvider {
     private var lastFetchTime = TimeSource.Monotonic.markNow()
     private var lastPayload: ByteArray? = null
+    private var currentTask: ForkJoinTask<*>? = null
 
     internal fun prefetch(await: Boolean = false) {
         val lastPayload = this.lastPayload
         if (lastPayload == null || lastFetchTime <= TimeSource.Monotonic.markNow().minus(5.minutes)) {
+            val task = currentTask
+            // Wait for the old task to finish
+            if (task != null) {
+                if (!await) {
+                    task.get()
+                }
+                return
+            }
             this.lastFetchTime = TimeSource.Monotonic.markNow()
             if (await) {
-                ForkJoinPool.commonPool().submit { fetch() }
+                currentTask = ForkJoinPool.commonPool().submit { fetch() }
             } else {
                 fetch()
             }
@@ -30,6 +40,7 @@ public class GamePackProvider {
         val con = forwarded.openConnection() as HttpURLConnection
         con.requestMethod = "GET"
         this.lastPayload = con.inputStream.readAllBytes()
+        this.currentTask = null
     }
 
     internal fun get(): ByteArray {