From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Joseph Hirschfeld <joe@ibj.io>
Date: Thu, 3 Mar 2016 03:15:41 -0600
Subject: [PATCH] Add exception reporting event


diff --git a/src/main/java/com/destroystokyo/paper/ServerSchedulerReportingWrapper.java b/src/main/java/com/destroystokyo/paper/ServerSchedulerReportingWrapper.java
new file mode 100644
index 0000000000000000000000000000000000000000..f699ce18ca044f813e194ef2786b7ea853ea86e7
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/ServerSchedulerReportingWrapper.java
@@ -0,0 +1,38 @@
+package com.destroystokyo.paper;
+
+import com.google.common.base.Preconditions;
+import org.bukkit.craftbukkit.scheduler.CraftTask;
+import com.destroystokyo.paper.event.server.ServerExceptionEvent;
+import com.destroystokyo.paper.exception.ServerSchedulerException;
+
+/**
+ * Reporting wrapper to catch exceptions not natively
+ */
+public class ServerSchedulerReportingWrapper implements Runnable {
+
+    private final CraftTask internalTask;
+
+    public ServerSchedulerReportingWrapper(CraftTask internalTask) {
+        this.internalTask = Preconditions.checkNotNull(internalTask, "internalTask");
+    }
+
+    @Override
+    public void run() {
+        try {
+            internalTask.run();
+        } catch (RuntimeException e) {
+            internalTask.getOwner().getServer().getPluginManager().callEvent(
+                    new ServerExceptionEvent(new ServerSchedulerException(e, internalTask))
+            );
+            throw e;
+        } catch (Throwable t) {
+            internalTask.getOwner().getServer().getPluginManager().callEvent(
+                    new ServerExceptionEvent(new ServerSchedulerException(t, internalTask))
+            ); //Do not rethrow, since it is not permitted with Runnable#run
+        }
+    }
+
+    public CraftTask getInternalTask() {
+        return internalTask;
+    }
+}
diff --git a/src/main/java/net/minecraft/server/Chunk.java b/src/main/java/net/minecraft/server/Chunk.java
index 687e609cab33aaea62784fb338ce70606a831217..8f3eee5ea812320af02e1bb6d2378fbbbef62e3c 100644
--- a/src/main/java/net/minecraft/server/Chunk.java
+++ b/src/main/java/net/minecraft/server/Chunk.java
@@ -1,5 +1,6 @@
 package net.minecraft.server;
 
+import com.destroystokyo.paper.exception.ServerInternalException;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import it.unimi.dsi.fastutil.longs.LongOpenHashSet;
@@ -609,10 +610,15 @@ public class Chunk implements IChunkAccess {
             this.tileEntities.remove(blockposition);
             // Paper end
         } else {
-            System.out.println("Attempted to place a tile entity (" + tileentity + ") at " + tileentity.position.getX() + "," + tileentity.position.getY() + "," + tileentity.position.getZ()
-                + " (" + getType(blockposition) + ") where there was no entity tile!");
-            System.out.println("Chunk coordinates: " + (this.loc.x * 16) + "," + (this.loc.z * 16));
-            new Exception().printStackTrace();
+            // Paper start
+            ServerInternalException e = new ServerInternalException(
+                    "Attempted to place a tile entity (" + tileentity + ") at " + tileentity.position.getX() + ","
+                            + tileentity.position.getY() + "," + tileentity.position.getZ()
+                            + " (" + getType(blockposition) + ") where there was no entity tile!\n" +
+                            "Chunk coordinates: " + (this.loc.x * 16) + "," + (this.loc.z * 16));
+            e.printStackTrace();
+            ServerInternalException.reportInternalException(e);
+            // Paper end
             // CraftBukkit end
         }
     }
diff --git a/src/main/java/net/minecraft/server/ChunkProviderServer.java b/src/main/java/net/minecraft/server/ChunkProviderServer.java
index 875f353dc3a0f3418b01821abf30e0f1ca32bb4d..fa4ad0b6dcd2cb428d87047340b81594b271e4b2 100644
--- a/src/main/java/net/minecraft/server/ChunkProviderServer.java
+++ b/src/main/java/net/minecraft/server/ChunkProviderServer.java
@@ -15,6 +15,9 @@ import java.util.function.BooleanSupplier;
 import java.util.function.Function;
 import java.util.function.Supplier;
 import javax.annotation.Nullable;
+import com.destroystokyo.paper.exception.ServerInternalException;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
 
 public class ChunkProviderServer extends IChunkProvider {
 
diff --git a/src/main/java/net/minecraft/server/NameReferencingFileConverter.java b/src/main/java/net/minecraft/server/NameReferencingFileConverter.java
index c9c2b0025159c8383998bfe374bcf995f75ed95f..1422503e11ac632c7b94640d59d9aaa0c5cb2f8f 100644
--- a/src/main/java/net/minecraft/server/NameReferencingFileConverter.java
+++ b/src/main/java/net/minecraft/server/NameReferencingFileConverter.java
@@ -1,5 +1,6 @@
 package net.minecraft.server;
 
+import com.destroystokyo.paper.exception.ServerInternalException;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.io.Files;
@@ -354,6 +355,7 @@ public class NameReferencingFileConverter {
                             root = NBTCompressedStreamTools.a(new java.io.FileInputStream(file5));
                         } catch (Exception exception) {
                             exception.printStackTrace();
+                            ServerInternalException.reportInternalException(exception); // Paper
                         }
 
                         if (root != null) {
@@ -367,6 +369,7 @@ public class NameReferencingFileConverter {
                                 NBTCompressedStreamTools.a(root, new java.io.FileOutputStream(file2));
                             } catch (Exception exception) {
                                 exception.printStackTrace();
+                                ServerInternalException.reportInternalException(exception); // Paper
                             }
                        }
                         // CraftBukkit end
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index eece2f689cce58a35d33c6e8d9d56ea4e9dfd88c..6374bf8785f7d99ab8750deba79867433d31eb5f 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -728,6 +728,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
                 this.world.checkSession();
             } catch (ExceptionWorldConflict exceptionworldconflict) {
                 PlayerChunkMap.LOGGER.error("Couldn't save chunk; already in use by another instance of Minecraft?", exceptionworldconflict);
+                com.destroystokyo.paper.exception.ServerInternalException.reportInternalException(exceptionworldconflict); // Paper
                 return false;
             }
 
@@ -756,6 +757,7 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
                 return true;
             } catch (Exception exception) {
                 PlayerChunkMap.LOGGER.error("Failed to save chunk {},{}", chunkcoordintpair.x, chunkcoordintpair.z, exception);
+                com.destroystokyo.paper.exception.ServerInternalException.reportInternalException(exception); // Paper
                 return false;
             }
         }
diff --git a/src/main/java/net/minecraft/server/RegionFile.java b/src/main/java/net/minecraft/server/RegionFile.java
index 187c4e0f58b7de58dfd2194afb194cbed0a58957..c2312a227c60417c02fc028047e1e4562bbfccff 100644
--- a/src/main/java/net/minecraft/server/RegionFile.java
+++ b/src/main/java/net/minecraft/server/RegionFile.java
@@ -241,6 +241,7 @@ public class RegionFile implements AutoCloseable {
                     return true;
                 }
             } catch (IOException ioexception) {
+                com.destroystokyo.paper.exception.ServerInternalException.reportInternalException(ioexception); // Paper
                 return false;
             }
         }
@@ -309,6 +310,7 @@ public class RegionFile implements AutoCloseable {
             filechannel.write(bytebuffer);
         } catch (Throwable throwable1) {
             throwable = throwable1;
+            com.destroystokyo.paper.exception.ServerInternalException.reportInternalException(throwable); // Paper
             throw throwable1;
         } finally {
             if (filechannel != null) {
diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
index 8ba344df6455307be88113e52d46b0d802f4443e..02157d051f3ecfc05f23ae8631cf01b6133ad159 100644
--- a/src/main/java/net/minecraft/server/SpawnerCreature.java
+++ b/src/main/java/net/minecraft/server/SpawnerCreature.java
@@ -8,6 +8,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 // CraftBukkit start
+import com.destroystokyo.paper.exception.ServerInternalException;
 import org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason;
 // CraftBukkit end
 
@@ -86,6 +87,7 @@ public final class SpawnerCreature {
                                                             entityinsentient = (EntityInsentient) entity;
                                                         } catch (Exception exception) {
                                                             SpawnerCreature.LOGGER.warn("Failed to create mob", exception);
+                                                            ServerInternalException.reportInternalException(exception); // Paper
                                                             return;
                                                         }
 
@@ -214,6 +216,7 @@ public final class SpawnerCreature {
                                 entity = biomebase_biomemeta.b.a(generatoraccess.getMinecraftWorld());
                             } catch (Exception exception) {
                                 SpawnerCreature.LOGGER.warn("Failed to create mob", exception);
+                                ServerInternalException.reportInternalException(exception); // Paper
                                 continue;
                             }
 
diff --git a/src/main/java/net/minecraft/server/VillageSiege.java b/src/main/java/net/minecraft/server/VillageSiege.java
index d5e9bae7097460b44f9061198cf54b421bf2b3cf..1bcf01c09a9ba5168d491797e13eeddcf8961b75 100644
--- a/src/main/java/net/minecraft/server/VillageSiege.java
+++ b/src/main/java/net/minecraft/server/VillageSiege.java
@@ -1,5 +1,7 @@
 package net.minecraft.server;
 
+import com.destroystokyo.paper.exception.ServerInternalException;
+
 import java.util.Iterator;
 import javax.annotation.Nullable;
 
@@ -100,6 +102,7 @@ public class VillageSiege {
                 entityzombie.prepare(worldserver, worldserver.getDamageScaler(new BlockPosition(entityzombie)), EnumMobSpawn.EVENT, (GroupDataEntity) null, (NBTTagCompound) null);
             } catch (Exception exception) {
                 exception.printStackTrace();
+                ServerInternalException.reportInternalException(exception); // Paper
                 return;
             }
 
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 6e8ac186c9975888fe7403506ad0724fb37ad26c..a6b2867094b6a757b4bc54a947b6972417845f2b 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -2,6 +2,9 @@ package net.minecraft.server;
 
 import co.aikar.timings.Timing;
 import co.aikar.timings.Timings;
+import com.destroystokyo.paper.event.server.ServerExceptionEvent;
+import com.destroystokyo.paper.exception.ServerInternalException;
+import com.google.common.base.MoreObjects;
 import com.google.common.collect.Lists;
 import java.io.IOException;
 import java.util.Collection;
@@ -664,8 +667,11 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
                         gameprofilerfiller.exit();
                     } catch (Throwable throwable) {
                         // Paper start - Prevent tile entity and entity crashes
-                        System.err.println("TileEntity threw exception at " + tileentity.world.getWorld().getName() + ":" + tileentity.position.getX() + "," + tileentity.position.getY() + "," + tileentity.position.getZ());
+                        String msg = "TileEntity threw exception at " + tileentity.world.getWorld().getName() + ":" + tileentity.position.getX() + "," + tileentity.position.getY() + "," + tileentity.position.getZ();
+                        System.err.println(msg);
                         throwable.printStackTrace();
+                        getServer().getPluginManager().callEvent(new ServerExceptionEvent(new ServerInternalException(msg, throwable)));
+                        // Paper end
                         tilesThisCycle--;
                         this.tileEntityListTick.remove(tileTickPosition--);
                         continue;
@@ -736,8 +742,10 @@ public abstract class World implements GeneratorAccess, AutoCloseable {
             consumer.accept(entity);
         } catch (Throwable throwable) {
             // Paper start - Prevent tile entity and entity crashes
-            System.err.println("Entity threw exception at " + entity.world.getWorld().getName() + ":" + entity.locX() + "," + entity.locY() + "," + entity.locZ());
+            String msg = "Entity threw exception at " + entity.world.getWorld().getName() + ":" + entity.locX() + "," + entity.locY() + "," + entity.locZ();
+            System.err.println(msg);
             throwable.printStackTrace();
+            getServer().getPluginManager().callEvent(new ServerExceptionEvent(new ServerInternalException(msg, throwable)));
             entity.dead = true;
             return;
             // Paper end
diff --git a/src/main/java/net/minecraft/server/WorldPersistentData.java b/src/main/java/net/minecraft/server/WorldPersistentData.java
index 19e68a78310de787bca701bc2597c64e34a77d7c..a2a25cf6a43a1f59a80c997e2980f2bb8e6b3817 100644
--- a/src/main/java/net/minecraft/server/WorldPersistentData.java
+++ b/src/main/java/net/minecraft/server/WorldPersistentData.java
@@ -121,6 +121,7 @@ public class WorldPersistentData {
             nbttagcompound = GameProfileSerializer.a(this.c, DataFixTypes.SAVED_DATA, nbttagcompound1, j, i);
         } catch (Throwable throwable4) {
             throwable = throwable4;
+            com.destroystokyo.paper.exception.ServerInternalException.reportInternalException(throwable); // Paper
             throw throwable4;
         } finally {
             if (pushbackinputstream != null) {
diff --git a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
index db433ed3707a1cb3a6df13b3c3fb5696155f7160..d05a9ae0fbdc8c9d86109a631d059299e51a2a39 100644
--- a/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
+++ b/src/main/java/org/bukkit/craftbukkit/scheduler/CraftScheduler.java
@@ -16,6 +16,9 @@ import java.util.concurrent.atomic.AtomicInteger;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
 import java.util.logging.Level;
+import com.destroystokyo.paper.ServerSchedulerReportingWrapper;
+import com.destroystokyo.paper.event.server.ServerExceptionEvent;
+import com.destroystokyo.paper.exception.ServerSchedulerException;
 import org.apache.commons.lang.Validate;
 import org.bukkit.plugin.IllegalPluginAccessException;
 import org.bukkit.plugin.Plugin;
@@ -399,20 +402,26 @@ public class CraftScheduler implements BukkitScheduler {
                 try {
                     task.run();
                 } catch (final Throwable throwable) {
+                    // Paper start
+                    String msg = String.format(
+                            "Task #%s for %s generated an exception",
+                            task.getTaskId(),
+                            task.getOwner().getDescription().getFullName());
                     task.getOwner().getLogger().log(
                             Level.WARNING,
-                            String.format(
-                                "Task #%s for %s generated an exception",
-                                task.getTaskId(),
-                                task.getOwner().getDescription().getFullName()),
+                            msg,
                             throwable);
+                    task.getOwner().getServer().getPluginManager().callEvent(
+                            new ServerExceptionEvent(new ServerSchedulerException(msg, throwable, task))
+                    );
+                    // Paper end
                 } finally {
                     currentTask = null;
                 }
                 parsePending();
             } else {
                 debugTail = debugTail.setNext(new CraftAsyncDebugger(currentTick + RECENT_TICKS, task.getOwner(), task.getTaskClass()));
-                executor.execute(task);
+                executor.execute(new ServerSchedulerReportingWrapper(task)); // Paper
                 // We don't need to parse pending
                 // (async tasks must live with race-conditions if they attempt to cancel between these few lines of code)
             }
