Implement client watchdog

fabric-crash-report-info-v1/build.gradle

@@ -1 +1,3 @@
 version = getSubprojectVersion(project)
+
+moduleDependencies(project, [':fabric-lifecycle-events-v1'])

fabric-crash-report-info-v1/src/client/java/net/fabricmc/fabric/impl/client/crash/report/info/ClientWatchdog.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2016, 2017, 2018, 2019 FabricMC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package net.fabricmc.fabric.impl.client.crash.report.info;
+
+import java.nio.file.Path;
+import java.util.Locale;
+
+import com.mojang.logging.LogUtils;
+import org.slf4j.Logger;
+
+import net.minecraft.Bootstrap;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.server.dedicated.DedicatedServerWatchdog;
+import net.minecraft.util.Util;
+import net.minecraft.util.crash.CrashReport;
+import net.minecraft.util.crash.ReportType;
+
+import net.fabricmc.api.ClientModInitializer;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientLifecycleEvents;
+import net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientTickEvents;
+import net.fabricmc.fabric.mixin.client.crash.report.info.MinecraftClientAccessor;
+import net.fabricmc.loader.api.FabricLoader;
+
+public class ClientWatchdog implements ClientModInitializer {
+	private static final Logger LOGGER = LogUtils.getLogger();
+	private static final int DEFAULT_MAX_TIME_MS = 30000;
+	private static final boolean ENABLED = FabricLoader.getInstance().isDevelopmentEnvironment() || Boolean.getBoolean("fabric.clientWatchdog.enabled");
+	private static final int MAX_TIME_MS = Integer.getInteger("fabric.clientWatchdog.maxTimeMs", DEFAULT_MAX_TIME_MS);
+	private volatile long tickStartTimeMs = -1;
+
+	@Override
+	public void onInitializeClient() {
+		if (!ENABLED) return;
+		ClientTickEvents.START_CLIENT_TICK.register((client) -> tickStartTimeMs = Util.getMeasuringTimeMs());
+		ClientLifecycleEvents.CLIENT_STARTED.register((client) -> {
+			Thread thread = new Thread(() -> run(client));
+			thread.setName("Fabric Client Watchdog");
+			thread.setDaemon(true);
+			thread.start();
+		});
+	}
+
+	public void run(MinecraftClient client) {
+		while (client.isRunning()) {
+			long tickStartTime = this.tickStartTimeMs;
+			long currentTime = Util.getMeasuringTimeMs();
+			long deltaMs = currentTime - tickStartTime;
+
+			if (tickStartTime >= 0 && deltaMs > MAX_TIME_MS) {
+				LOGGER.error(
+						LogUtils.FATAL_MARKER,
+						"A single client tick took {} seconds (should be max {})",
+						String.format(Locale.ROOT, "%.2f", (float) deltaMs / 1000),
+						String.format(Locale.ROOT, "%.2f", (float) MAX_TIME_MS / 1000)
+				);
+				LOGGER.error(LogUtils.FATAL_MARKER, "Considering it to be crashed, client will forcibly shutdown.");
+				CrashReport report = DedicatedServerWatchdog.createCrashReport("Fabric Client Watchdog", ((MinecraftClientAccessor) client).getThread().threadId());
+				client.addDetailsToCrashReport(report);
+				Bootstrap.println("Crash report:\n" + report.asString(ReportType.MINECRAFT_CRASH_REPORT));
+				Path path = client.runDirectory.toPath().resolve("crash-reports").resolve("crash-" + Util.getFormattedCurrentTime() + "-client.txt");
+
+				if (report.writeToFile(path, ReportType.MINECRAFT_CRASH_REPORT)) {
+					LOGGER.error("This crash report has been saved to: {}", path.toAbsolutePath());
+				} else {
+					LOGGER.error("We were unable to save this crash report to disk.");
+				}
+
+				System.exit(1);
+			}
+		}
+	}
+}

fabric-crash-report-info-v1/src/client/java/net/fabricmc/fabric/mixin/client/crash/report/info/MinecraftClientAccessor.java

@@ -0,0 +1,12 @@
+package net.fabricmc.fabric.mixin.client.crash.report.info;
+
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.gen.Accessor;
+
+import net.minecraft.client.MinecraftClient;
+
+@Mixin(MinecraftClient.class)
+public interface MinecraftClientAccessor {
+	@Accessor
+	Thread getThread();
+}

fabric-crash-report-info-v1/src/client/resources/fabric-crash-report-info-v1.client.mixins.json

@@ -0,0 +1,11 @@
+{
+  "required": true,
+  "package": "net.fabricmc.fabric.mixin.client.crash.report.info",
+  "compatibilityLevel": "JAVA_21",
+  "client": [
+    "MinecraftClientAccessor"
+  ],
+  "injectors": {
+    "defaultRequire": 1
+  }
+}

fabric-crash-report-info-v1/src/main/resources/fabric.mod.json

@@ -19,8 +19,17 @@
     "fabricloader": ">=0.16.4"
   },
   "description": "Adds Fabric-related debug info to crash reports.",
+  "entrypoints": {
+    "client": [
+      "net.fabricmc.fabric.impl.client.crash.report.info.ClientWatchdog"
+    ]
+  },
   "mixins": [
-    "fabric-crash-report-info-v1.mixins.json"
+    "fabric-crash-report-info-v1.mixins.json",
+    {
+      "config": "fabric-crash-report-info-v1.client.mixins.json",
+      "environment": "client"
+    }
   ],
   "custom": {
     "fabric-api:module-lifecycle": "stable"