Run IRC socket I/O on a dedicated background thread

Auto-connect on CLIENT_STARTED, .irc reconnect and .irc <msg> all used
to open a TCP socket on the render thread with a 5s connect timeout,
freezing client startup and chat input when the server was unreachable.
Dispatch those paths through a single daemon executor instead, and
release the socket plus the executor on CLIENT_STOPPING.

build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'net.fabricmc.fabric-loom' version '1.17-SNAPSHOT'
+    id 'net.fabricmc.fabric-loom' version "${project.loom_version}"
     id 'maven-publish'
 }
 
@@ -30,8 +30,9 @@ repositories {
 
 dependencies {
     minecraft "com.mojang:minecraft:${project.minecraft_version}"
-    implementation "net.fabricmc:fabric-loader:${project.loader_version}"
+    mappings loom.officialMojangMappings()
-    implementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
+    modImplementation "net.fabricmc:fabric-loader:${project.loader_version}"
+    modImplementation "net.fabricmc.fabric-api:fabric-api:${project.fabric_version}"
 }
 
 processResources {

src/client/java/ru/nevetime/clientirc/ClientIrcMod.java

@@ -11,12 +11,21 @@ import net.minecraft.network.chat.Component;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
 public final class ClientIrcMod implements ClientModInitializer {
     public static final String MOD_ID = "clientirc";
     public static final Logger LOGGER = LoggerFactory.getLogger(MOD_ID);
 
     private static final String COMMAND_PREFIX = ".irc";
 
+    private static final ExecutorService IO_EXECUTOR = Executors.newSingleThreadExecutor(runnable -> {
+        Thread thread = new Thread(runnable, "clientirc-io");
+        thread.setDaemon(true);
+        return thread;
+    });
+
     private static IrcConfig config;
     private static IrcService service;
 
@@ -27,10 +36,16 @@ public final class ClientIrcMod implements ClientModInitializer {
 
         ClientLifecycleEvents.CLIENT_STARTED.register(client -> {
             if (config.autoConnect) {
-                service.connect(resolvePlayerName(client));
+                String playerName = resolvePlayerName(client);
+                IO_EXECUTOR.execute(() -> service.connect(playerName));
             }
         });
 
+        ClientLifecycleEvents.CLIENT_STOPPING.register(client -> {
+            service.disconnect();
+            IO_EXECUTOR.shutdownNow();
+        });
+
         ClientTickEvents.END_CLIENT_TICK.register(client -> {
             IrcService.DisplayLine line;
             while ((line = service.pollLine()) != null) {
@@ -63,9 +78,12 @@ public final class ClientIrcMod implements ClientModInitializer {
         }
 
         if ("reconnect".equalsIgnoreCase(argument)) {
-            boolean connected = service.reconnect(resolvePlayerName(client));
+            String playerName = resolvePlayerName(client);
+            IO_EXECUTOR.execute(() -> {
+                boolean connected = service.reconnect(playerName);
                 ChatFormatting color = connected ? ChatFormatting.GREEN : ChatFormatting.RED;
                 pushClientChat(client, Component.literal("[IRC] reconnect " + (connected ? "ok" : "failed")).withStyle(color));
+            });
             return true;
         }
 
@@ -76,15 +94,16 @@ public final class ClientIrcMod implements ClientModInitializer {
             return true;
         }
 
-        if (!service.ensureConnected(resolvePlayerName(client))) {
+        String playerName = resolvePlayerName(client);
+        IO_EXECUTOR.execute(() -> {
+            if (!service.ensureConnected(playerName)) {
                 pushClientChat(client, Component.literal("[IRC] server is offline or config is wrong").withStyle(ChatFormatting.RED));
-            return true;
+                return;
             }
-
+            if (!service.sendChat(playerName, argument)) {
-        boolean sent = service.sendChat(resolvePlayerName(client), argument);
-        if (!sent) {
                 pushClientChat(client, Component.literal("[IRC] send failed").withStyle(ChatFormatting.RED));
             }
+        });
         return true;
     }