Folia/patches/server/0008-Max-pending-logins.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Thu, 9 Mar 2023 20:50:15 -0800
Subject: [PATCH] Max pending logins

Should help the floodgates on launch

diff --git a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
index 626d99c785d2886bce605ba468ee24ce1710beb2..37ca4f314c8f0fdca2927c0b425bda4b959acff8 100644
--- a/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerLoginPacketListenerImpl.java
@@ -85,7 +85,7 @@ public class ServerLoginPacketListenerImpl implements ServerLoginPacketListener,
             UUID uniqueId = UUIDUtil.getOrCreatePlayerUUID(this.gameProfile);
             if (this.server.getPlayerList().pushPendingJoin(name, uniqueId, this.connection)) {
                 this.handleAcceptedLogin();
-            }
+            } else { --this.tick; }
             // Folia end - region threading - rewrite login process
         } // Folia - region threading - remove delayed accept
 
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
index f60feb0b9101afa24363c438949e1d60ccab0272..fe4d87e08e8910524e6e3413377e3ba9d039bf03 100644
--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
@@ -168,6 +168,8 @@ public abstract class PlayerList {
     private final Map<String, Connection> connectionByName = new java.util.HashMap<>();
     private final Map<UUID, Connection> connectionById = new java.util.HashMap<>();
 
+    public static int maxConcurrentLogins = 5;
+
     public boolean pushPendingJoin(String userName, UUID byId, Connection conn) {
         userName = userName.toLowerCase(java.util.Locale.ROOT);
         Connection conflictingName, conflictingId;
@@ -176,6 +178,15 @@ public abstract class PlayerList {
             conflictingId = this.connectionById.get(byId);
 
             if (conflictingName == null && conflictingId == null) {
+                int loggedInCount = 0;
+                for (Connection value : this.connectionById.values()) {
+                    if (value.isPlayerConnected()) {
+                        ++loggedInCount;
+                    }
+                }
+                if ((this.connectionById.size() - loggedInCount) >= maxConcurrentLogins) {
+                    return false;
+                }
                 this.connectionByName.put(userName, conn);
                 this.connectionById.put(byId, conn);
             }