Merge branch 'mc-1.15.x' into mc-1.16.x

src/main/java/dan200/computercraft/core/apis/IAPIEnvironment.java

@@ -62,6 +62,7 @@ public interface IAPIEnvironment
     @Nullable
     IPeripheral getPeripheral( ComputerSide side );
 
+    @Nullable
     String getLabel();
 
     void setLabel( @Nullable String label );

src/main/java/dan200/computercraft/core/apis/http/websocket/Websocket.java

@@ -28,7 +28,6 @@ import io.netty.handler.codec.http.HttpObjectAggregator;
 import io.netty.handler.codec.http.websocketx.WebSocketClientHandshaker;
 import io.netty.handler.codec.http.websocketx.WebSocketClientHandshakerFactory;
 import io.netty.handler.codec.http.websocketx.WebSocketVersion;
-import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler;
 import io.netty.handler.ssl.SslContext;
 
 import java.lang.ref.WeakReference;
@@ -160,7 +159,7 @@ public class Websocket extends Resource<Websocket>
                         p.addLast(
                             new HttpClientCodec(),
                             new HttpObjectAggregator( 8192 ),
-                            WebSocketClientCompressionHandler.INSTANCE,
+                            WebsocketCompressionHandler.INSTANCE,
                             new WebsocketHandler( Websocket.this, handshaker, options )
                         );
                     }

src/main/java/dan200/computercraft/core/apis/http/websocket/WebsocketCompressionHandler.java

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.core.apis.http.websocket;
+
+import io.netty.channel.ChannelHandler;
+import io.netty.handler.codec.compression.ZlibCodecFactory;
+import io.netty.handler.codec.http.websocketx.extensions.WebSocketClientExtensionHandler;
+import io.netty.handler.codec.http.websocketx.extensions.compression.DeflateFrameClientExtensionHandshaker;
+import io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateClientExtensionHandshaker;
+import io.netty.handler.codec.http.websocketx.extensions.compression.WebSocketClientCompressionHandler;
+
+import static io.netty.handler.codec.http.websocketx.extensions.compression.PerMessageDeflateServerExtensionHandshaker.MAX_WINDOW_SIZE;
+
+/**
+ * An alternative to {@link WebSocketClientCompressionHandler} which supports the {@literal client_no_context_takeover}
+ * extension. Makes CC <em>slightly</em> more flexible.
+ */
+@ChannelHandler.Sharable
+final class WebsocketCompressionHandler extends WebSocketClientExtensionHandler
+{
+    public static final WebsocketCompressionHandler INSTANCE = new WebsocketCompressionHandler();
+
+    private WebsocketCompressionHandler()
+    {
+        super(
+            new PerMessageDeflateClientExtensionHandshaker(
+                6, ZlibCodecFactory.isSupportingWindowSizeAndMemLevel(), MAX_WINDOW_SIZE,
+                true, false
+            ),
+            new DeflateFrameClientExtensionHandshaker( false ),
+            new DeflateFrameClientExtensionHandshaker( true )
+        );
+
+    }
+}

src/main/java/dan200/computercraft/shared/command/ClientCommands.java

@@ -7,11 +7,13 @@ package dan200.computercraft.shared.command;
 
 import dan200.computercraft.ComputerCraft;
 import dan200.computercraft.shared.util.IDAssigner;
+import net.minecraft.server.MinecraftServer;
 import net.minecraft.util.Util;
 import net.minecraftforge.api.distmarker.Dist;
 import net.minecraftforge.client.event.ClientChatEvent;
 import net.minecraftforge.eventbus.api.SubscribeEvent;
 import net.minecraftforge.fml.common.Mod;
+import net.minecraftforge.fml.server.ServerLifecycleHooks;
 
 import java.io.File;
 
@@ -35,6 +37,9 @@ public final class ClientCommands
         // Emulate the command on the client side
         if( event.getMessage().startsWith( OPEN_COMPUTER ) )
         {
+            MinecraftServer server = ServerLifecycleHooks.getCurrentServer();
+            if( server == null || server.isDedicatedServer() ) return;
+
             event.setCanceled( true );
 
             String idStr = event.getMessage().substring( OPEN_COMPUTER.length() ).trim();

src/main/java/dan200/computercraft/shared/network/NetworkHandler.java

@@ -21,7 +21,6 @@ import net.minecraftforge.fml.network.NetworkEvent;
 import net.minecraftforge.fml.network.NetworkRegistry;
 import net.minecraftforge.fml.network.PacketDistributor;
 import net.minecraftforge.fml.network.simple.SimpleChannel;
-import net.minecraftforge.fml.server.ServerLifecycleHooks;
 
 import java.util.function.Function;
 import java.util.function.Supplier;
@@ -71,10 +70,7 @@ public final class NetworkHandler
 
     public static void sendToAllPlayers( NetworkMessage packet )
     {
-        for( ServerPlayerEntity player : ServerLifecycleHooks.getCurrentServer().getPlayerList().getPlayers() )
-        {
-            sendToPlayer( player, packet );
-        }
+        network.send( PacketDistributor.ALL.noArg(), packet );
     }
 
     public static void sendToServer( NetworkMessage packet )

src/main/java/dan200/computercraft/shared/peripheral/monitor/MonitorState.java

@@ -0,0 +1,52 @@
+/*
+ * This file is part of ComputerCraft - http://www.computercraft.info
+ * Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
+ * Send enquiries to dratcliffe@gmail.com
+ */
+package dan200.computercraft.shared.peripheral.monitor;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+final class MonitorState
+{
+    public static final MonitorState UNLOADED = new MonitorState( State.UNLOADED, null );
+    public static final MonitorState MISSING = new MonitorState( State.MISSING, null );
+
+    private final State state;
+    private final TileMonitor monitor;
+
+    private MonitorState( @Nonnull State state, @Nullable TileMonitor monitor )
+    {
+        this.state = state;
+        this.monitor = monitor;
+    }
+
+    public static MonitorState present( @Nonnull TileMonitor monitor )
+    {
+        return new MonitorState( State.PRESENT, monitor );
+    }
+
+    public boolean isPresent()
+    {
+        return state == State.PRESENT;
+    }
+
+    public boolean isMissing()
+    {
+        return state == State.MISSING;
+    }
+
+    @Nullable
+    public TileMonitor getMonitor()
+    {
+        return monitor;
+    }
+
+    enum State
+    {
+        UNLOADED,
+        MISSING,
+        PRESENT,
+    }
+}

src/main/java/dan200/computercraft/shared/peripheral/monitor/TileMonitor.java

@@ -56,6 +56,7 @@ public class TileMonitor extends TileGeneric
     private final Set<IComputerAccess> computers = new HashSet<>();
 
     private boolean needsUpdate = false;
+    private boolean needsValidating = false;
     private boolean destroyed = false;
     private boolean visiting = false;
 
@@ -78,6 +79,7 @@ public class TileMonitor extends TileGeneric
     public void onLoad()
     {
         super.onLoad();
+        needsValidating = true;
         TickScheduler.schedule( this );
     }
 
@@ -149,6 +151,12 @@ public class TileMonitor extends TileGeneric
     @Override
     public void blockTick()
     {
+        if( needsValidating )
+        {
+            needsValidating = false;
+            validate();
+        }
+
         if( needsUpdate )
         {
             needsUpdate = false;
@@ -165,7 +173,7 @@ public class TileMonitor extends TileGeneric
             {
                 for( int y = 0; y < height; y++ )
                 {
-                    TileMonitor monitor = getNeighbour( x, y );
+                    TileMonitor monitor = getNeighbour( x, y ).getMonitor();
                     if( monitor == null ) continue;
 
                     for( IComputerAccess computer : monitor.computers )
@@ -209,7 +217,7 @@ public class TileMonitor extends TileGeneric
     {
         if( serverMonitor != null ) return serverMonitor;
 
-        TileMonitor origin = getOrigin();
+        TileMonitor origin = getOrigin().getMonitor();
         if( origin == null ) return null;
 
         return serverMonitor = origin.serverMonitor;
@@ -230,7 +238,7 @@ public class TileMonitor extends TileGeneric
             {
                 for( int y = 0; y < height; y++ )
                 {
-                    TileMonitor monitor = getNeighbour( x, y );
+                    TileMonitor monitor = getNeighbour( x, y ).getMonitor();
                     if( monitor != null ) monitor.serverMonitor = serverMonitor;
                 }
             }
@@ -375,24 +383,24 @@ public class TileMonitor extends TileGeneric
         return yIndex;
     }
 
-    private TileMonitor getSimilarMonitorAt( BlockPos pos )
+    @Nonnull
+    private MonitorState getSimilarMonitorAt( BlockPos pos )
     {
-        if( pos.equals( getBlockPos() ) ) return this;
+        if( pos.equals( getBlockPos() ) ) return MonitorState.present( this );
 
-        int y = pos.getY();
         World world = getLevel();
-        if( world == null || !world.isAreaLoaded( pos, 0 ) ) return null;
+        if( world == null || !world.isAreaLoaded( pos, 0 ) ) return MonitorState.UNLOADED;
 
         TileEntity tile = world.getBlockEntity( pos );
-        if( !(tile instanceof TileMonitor) ) return null;
+        if( !(tile instanceof TileMonitor) ) return MonitorState.MISSING;
 
         TileMonitor monitor = (TileMonitor) tile;
         return !monitor.visiting && !monitor.destroyed && advanced == monitor.advanced
             && getDirection() == monitor.getDirection() && getOrientation() == monitor.getOrientation()
-            ? monitor : null;
+            ? MonitorState.present( monitor ) : MonitorState.MISSING;
     }
 
-    private TileMonitor getNeighbour( int x, int y )
+    private MonitorState getNeighbour( int x, int y )
     {
         BlockPos pos = getBlockPos();
         Direction right = getRight();
@@ -402,7 +410,7 @@ public class TileMonitor extends TileGeneric
         return getSimilarMonitorAt( pos.relative( right, xOffset ).relative( down, yOffset ) );
     }
 
-    private TileMonitor getOrigin()
+    private MonitorState getOrigin()
     {
         return getNeighbour( 0, 0 );
     }
@@ -426,7 +434,7 @@ public class TileMonitor extends TileGeneric
         {
             for( int y = 0; y < height; y++ )
             {
-                TileMonitor monitor = getNeighbour( x, y );
+                TileMonitor monitor = getNeighbour( x, y ).getMonitor();
                 if( monitor != null && monitor.peripheral != null )
                 {
                     needsTerminal = true;
@@ -454,7 +462,7 @@ public class TileMonitor extends TileGeneric
         {
             for( int y = 0; y < height; y++ )
             {
-                TileMonitor monitor = getNeighbour( x, y );
+                TileMonitor monitor = getNeighbour( x, y ).getMonitor();
                 if( monitor == null ) continue;
 
                 monitor.xIndex = x;
@@ -470,13 +478,13 @@ public class TileMonitor extends TileGeneric
 
     private boolean mergeLeft()
     {
-        TileMonitor left = getNeighbour( -1, 0 );
+        TileMonitor left = getNeighbour( -1, 0 ).getMonitor();
         if( left == null || left.yIndex != 0 || left.height != height ) return false;
 
         int width = left.width + this.width;
         if( width > ComputerCraft.monitorWidth ) return false;
 
-        TileMonitor origin = left.getOrigin();
+        TileMonitor origin = left.getOrigin().getMonitor();
         if( origin != null ) origin.resize( width, height );
         left.expand();
         return true;
@@ -484,13 +492,13 @@ public class TileMonitor extends TileGeneric
 
     private boolean mergeRight()
     {
-        TileMonitor right = getNeighbour( width, 0 );
+        TileMonitor right = getNeighbour( width, 0 ).getMonitor();
         if( right == null || right.yIndex != 0 || right.height != height ) return false;
 
         int width = this.width + right.width;
         if( width > ComputerCraft.monitorWidth ) return false;
 
-        TileMonitor origin = getOrigin();
+        TileMonitor origin = getOrigin().getMonitor();
         if( origin != null ) origin.resize( width, height );
         expand();
         return true;
@@ -498,13 +506,13 @@ public class TileMonitor extends TileGeneric
 
     private boolean mergeUp()
     {
-        TileMonitor above = getNeighbour( 0, height );
+        TileMonitor above = getNeighbour( 0, height ).getMonitor();
         if( above == null || above.xIndex != 0 || above.width != width ) return false;
 
         int height = above.height + this.height;
         if( height > ComputerCraft.monitorHeight ) return false;
 
-        TileMonitor origin = getOrigin();
+        TileMonitor origin = getOrigin().getMonitor();
         if( origin != null ) origin.resize( width, height );
         expand();
         return true;
@@ -512,13 +520,13 @@ public class TileMonitor extends TileGeneric
 
     private boolean mergeDown()
     {
-        TileMonitor below = getNeighbour( 0, -1 );
+        TileMonitor below = getNeighbour( 0, -1 ).getMonitor();
         if( below == null || below.xIndex != 0 || below.width != width ) return false;
 
         int height = this.height + below.height;
         if( height > ComputerCraft.monitorHeight ) return false;
 
-        TileMonitor origin = below.getOrigin();
+        TileMonitor origin = below.getOrigin().getMonitor();
         if( origin != null ) origin.resize( width, height );
         below.expand();
         return true;
@@ -547,22 +555,22 @@ public class TileMonitor extends TileGeneric
         visiting = true;
         if( xIndex > 0 )
         {
-            TileMonitor left = getNeighbour( xIndex - 1, yIndex );
+            TileMonitor left = getNeighbour( xIndex - 1, yIndex ).getMonitor();
             if( left != null ) left.contract();
         }
         if( xIndex + 1 < width )
         {
-            TileMonitor right = getNeighbour( xIndex + 1, yIndex );
+            TileMonitor right = getNeighbour( xIndex + 1, yIndex ).getMonitor();
             if( right != null ) right.contract();
         }
         if( yIndex > 0 )
         {
-            TileMonitor below = getNeighbour( xIndex, yIndex - 1 );
+            TileMonitor below = getNeighbour( xIndex, yIndex - 1 ).getMonitor();
             if( below != null ) below.contract();
         }
         if( yIndex + 1 < height )
         {
-            TileMonitor above = getNeighbour( xIndex, yIndex + 1 );
+            TileMonitor above = getNeighbour( xIndex, yIndex + 1 ).getMonitor();
             if( above != null ) above.contract();
         }
         visiting = false;
@@ -573,11 +581,11 @@ public class TileMonitor extends TileGeneric
         int height = this.height;
         int width = this.width;
 
-        TileMonitor origin = getOrigin();
+        TileMonitor origin = getOrigin().getMonitor();
         if( origin == null )
         {
-            TileMonitor right = width > 1 ? getNeighbour( 1, 0 ) : null;
-            TileMonitor below = height > 1 ? getNeighbour( 0, 1 ) : null;
+            TileMonitor right = width > 1 ? getNeighbour( 1, 0 ).getMonitor() : null;
+            TileMonitor below = height > 1 ? getNeighbour( 0, 1 ).getMonitor() : null;
 
             if( right != null ) right.resize( width - 1, 1 );
             if( below != null ) below.resize( width, height - 1 );
@@ -591,7 +599,7 @@ public class TileMonitor extends TileGeneric
         {
             for( int x = 0; x < width; x++ )
             {
-                TileMonitor monitor = origin.getNeighbour( x, y );
+                TileMonitor monitor = origin.getNeighbour( x, y ).getMonitor();
                 if( monitor != null ) continue;
 
                 // Decompose
@@ -607,17 +615,17 @@ public class TileMonitor extends TileGeneric
                 }
                 if( x > 0 )
                 {
-                    left = origin.getNeighbour( 0, y );
+                    left = origin.getNeighbour( 0, y ).getMonitor();
                     left.resize( x, 1 );
                 }
                 if( x + 1 < width )
                 {
-                    right = origin.getNeighbour( x + 1, y );
+                    right = origin.getNeighbour( x + 1, y ).getMonitor();
                     right.resize( width - (x + 1), 1 );
                 }
                 if( y + 1 < height )
                 {
-                    below = origin.getNeighbour( 0, y + 1 );
+                    below = origin.getNeighbour( 0, y + 1 ).getMonitor();
                     below.resize( width, height - (y + 1) );
                 }
 
@@ -631,6 +639,38 @@ public class TileMonitor extends TileGeneric
         }
     }
 
+    private boolean checkMonitorAt( int xIndex, int yIndex )
+    {
+        BlockPos pos = getBlockPos();
+        Direction right = getRight();
+        Direction down = getDown();
+
+        MonitorState state = getSimilarMonitorAt( pos.relative( right, xIndex ).relative( down, yIndex ) );
+
+        if( state.isMissing() ) return false;
+
+        TileMonitor monitor = state.getMonitor();
+        if( monitor == null ) return true;
+
+        return monitor.xIndex == xIndex && monitor.yIndex == yIndex && monitor.width == width && monitor.height == height;
+    }
+
+    private void validate()
+    {
+        if( xIndex == 0 && yIndex == 0 && width == 1 || height == 1 ) return;
+
+        if( checkMonitorAt( 0, 0 ) && checkMonitorAt( 0, height - 1 ) &&
+            checkMonitorAt( width - 1, 0 ) && checkMonitorAt( width - 1, height - 1 ) )
+        {
+            return;
+        }
+
+        // Something in our monitor is invalid. For now, let's just reset ourselves and then try to integrate ourselves
+        // later.
+        resize( 1, 1 );
+        needsUpdate = true;
+    }
+
     private void monitorTouched( float xPos, float yPos, float zPos )
     {
         XYPair pair = XYPair
@@ -658,7 +698,7 @@ public class TileMonitor extends TileGeneric
         {
             for( int x = 0; x < width; x++ )
             {
-                TileMonitor monitor = getNeighbour( x, y );
+                TileMonitor monitor = getNeighbour( x, y ).getMonitor();
                 if( monitor == null ) continue;
 
                 for( IComputerAccess computer : monitor.computers )
@@ -684,8 +724,8 @@ public class TileMonitor extends TileGeneric
     @Override
     public AxisAlignedBB getRenderBoundingBox()
     {
-        TileMonitor start = getNeighbour( 0, 0 );
-        TileMonitor end = getNeighbour( width - 1, height - 1 );
+        TileMonitor start = getNeighbour( 0, 0 ).getMonitor();
+        TileMonitor end = getNeighbour( width - 1, height - 1 ).getMonitor();
         if( start != null && end != null )
         {
             BlockPos startPos = start.getBlockPos();

src/main/java/dan200/computercraft/shared/peripheral/speaker/TileSpeaker.java

@@ -47,7 +47,10 @@ public class TileSpeaker extends TileGeneric implements ITickableTileEntity
     public void setRemoved()
     {
         super.setRemoved();
-        NetworkHandler.sendToAllPlayers( new SpeakerStopClientMessage( source ) );
+        if( level != null && !level.isClientSide )
+        {
+            NetworkHandler.sendToAllPlayers( new SpeakerStopClientMessage( source ) );
+        }
     }
 
     @Nonnull

src/main/resources/data/computercraft/lua/rom/apis/rednet.lua

@@ -382,12 +382,12 @@ function run()
             -- Got a modem message, process it and add it to the rednet event queue
             local sModem, nChannel, nReplyChannel, tMessage = p1, p2, p3, p4
             if isOpen(sModem) and (nChannel == os.getComputerID() or nChannel == CHANNEL_BROADCAST) then
-                if type(tMessage) == "table" and tMessage.nMessageID then
-                    if not tReceivedMessages[tMessage.nMessageID] then
-                        tReceivedMessages[tMessage.nMessageID] = true
-                        tReceivedMessageTimeouts[os.startTimer(30)] = tMessage.nMessageID
-                        os.queueEvent("rednet_message", nReplyChannel, tMessage.message, tMessage.sProtocol)
-                    end
+                if type(tMessage) == "table" and type(tMessage.nMessageID) == "number"
+                    and tMessage.nMessageID == tMessage.nMessageID and not tReceivedMessages[tMessage.nMessageID]
+                then
+                    tReceivedMessages[tMessage.nMessageID] = true
+                    tReceivedMessageTimeouts[os.startTimer(30)] = tMessage.nMessageID
+                    os.queueEvent("rednet_message", nReplyChannel, tMessage.message, tMessage.sProtocol)
                 end
             end
 

src/main/resources/data/computercraft/lua/rom/programs/help.lua

@@ -265,7 +265,7 @@ while true do
         local new_width, new_height = term.getSize()
 
         if new_width ~= width then
-            lines = word_wrap(contents, new_width)
+            lines, fg, bg = word_wrap(contents, new_width)
             print_height = #lines
         end
 

src/test/java/dan200/computercraft/core/apis/AsyncRunner.kt

@@ -0,0 +1,121 @@
+package dan200.computercraft.core.apis
+
+import dan200.computercraft.ComputerCraft
+import dan200.computercraft.api.lua.ILuaAPI
+import dan200.computercraft.api.lua.MethodResult
+import dan200.computercraft.api.peripheral.IPeripheral
+import dan200.computercraft.api.peripheral.IWorkMonitor
+import dan200.computercraft.core.computer.BasicEnvironment
+import dan200.computercraft.core.computer.ComputerSide
+import dan200.computercraft.core.computer.IComputerEnvironment
+import dan200.computercraft.core.filesystem.FileSystem
+import dan200.computercraft.core.terminal.Terminal
+import dan200.computercraft.core.tracking.TrackingField
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.runBlocking
+import kotlinx.coroutines.withTimeout
+import kotlin.time.Duration
+import kotlin.time.ExperimentalTime
+import kotlin.time.seconds
+
+
+abstract class NullApiEnvironment : IAPIEnvironment {
+    private val computerEnv = BasicEnvironment()
+
+    override fun getComputerID(): Int = 0
+    override fun getComputerEnvironment(): IComputerEnvironment = computerEnv
+    override fun getMainThreadMonitor(): IWorkMonitor = throw IllegalStateException("Work monitor not available")
+    override fun getTerminal(): Terminal = throw IllegalStateException("Terminal not available")
+    override fun getFileSystem(): FileSystem = throw IllegalStateException("Terminal not available")
+    override fun shutdown() {}
+    override fun reboot() {}
+    override fun setOutput(side: ComputerSide?, output: Int) {}
+    override fun getOutput(side: ComputerSide?): Int = 0
+    override fun getInput(side: ComputerSide?): Int = 0
+    override fun setBundledOutput(side: ComputerSide?, output: Int) {}
+    override fun getBundledOutput(side: ComputerSide?): Int = 0
+    override fun getBundledInput(side: ComputerSide?): Int = 0
+    override fun setPeripheralChangeListener(listener: IAPIEnvironment.IPeripheralChangeListener?) {}
+    override fun getPeripheral(side: ComputerSide?): IPeripheral? = null
+    override fun getLabel(): String? = null
+    override fun setLabel(label: String?) {}
+    override fun startTimer(ticks: Long): Int = 0
+    override fun cancelTimer(id: Int) {}
+    override fun addTrackingChange(field: TrackingField, change: Long) {}
+}
+
+class EventResult(val name: String, val args: Array<Any?>)
+
+class AsyncRunner : NullApiEnvironment() {
+    private val eventStream: Channel<Array<Any?>> = Channel(Int.MAX_VALUE)
+    private val apis: MutableList<ILuaAPI> = mutableListOf()
+
+    override fun queueEvent(event: String?, vararg args: Any?) {
+        ComputerCraft.log.debug("Queue event $event ${args.contentToString()}")
+        if (!eventStream.offer(arrayOf(event, *args))) {
+            throw IllegalStateException("Queue is full")
+        }
+    }
+
+    override fun shutdown() {
+        super.shutdown()
+        eventStream.close()
+        apis.forEach { it.shutdown() }
+    }
+
+    fun <T : ILuaAPI> addApi(api: T): T {
+        apis.add(api)
+        api.startup()
+        return api
+    }
+
+    suspend fun resultOf(toRun: MethodResult): Array<Any?> {
+        var running = toRun
+        while (running.callback != null) running = runOnce(running)
+        return running.result ?: empty
+    }
+
+    private suspend fun runOnce(obj: MethodResult): MethodResult {
+        val callback = obj.callback ?: throw NullPointerException("Callback cannot be null")
+
+        val result = obj.result
+        val filter: String? = if (result.isNullOrEmpty() || result[0] !is String) {
+            null
+        } else {
+            result[0] as String
+        }
+
+        return callback.resume(pullEventImpl(filter))
+    }
+
+    private suspend fun pullEventImpl(filter: String?): Array<Any?> {
+        for (event in eventStream) {
+            ComputerCraft.log.debug("Pulled event ${event.contentToString()}")
+            val eventName = event[0] as String
+            if (filter == null || eventName == filter || eventName == "terminate") return event
+        }
+
+        throw IllegalStateException("No more events")
+    }
+
+    suspend fun pullEvent(filter: String? = null): EventResult {
+        val result = pullEventImpl(filter)
+        return EventResult(result[0] as String, result.copyOfRange(1, result.size))
+    }
+
+    companion object {
+        private val empty: Array<Any?> = arrayOf()
+
+        @OptIn(ExperimentalTime::class)
+        fun runTest(timeout: Duration = 5.seconds, fn: suspend AsyncRunner.() -> Unit) {
+            runBlocking {
+                val runner = AsyncRunner()
+                try {
+                    withTimeout(timeout) { fn(runner) }
+                } finally {
+                    runner.shutdown()
+                }
+            }
+        }
+    }
+}

src/test/java/dan200/computercraft/core/apis/http/options/TestHttpApi.kt

@@ -0,0 +1,51 @@
+package dan200.computercraft.core.apis.http.options
+
+import dan200.computercraft.ComputerCraft
+import dan200.computercraft.core.apis.AsyncRunner
+import dan200.computercraft.core.apis.HTTPAPI
+import org.junit.jupiter.api.AfterAll
+import org.junit.jupiter.api.Assertions.assertArrayEquals
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.BeforeAll
+import org.junit.jupiter.api.Disabled
+import org.junit.jupiter.api.Test
+import java.util.*
+
+@Disabled("Requires some setup locally.")
+class TestHttpApi {
+    companion object {
+        private const val WS_ADDRESS = "ws://127.0.0.1:8080"
+
+        @JvmStatic
+        @BeforeAll
+        fun before() {
+            ComputerCraft.httpRules = listOf(AddressRule.parse("*", null, Action.ALLOW.toPartial()))
+        }
+
+        @JvmStatic
+        @AfterAll
+        fun after() {
+            ComputerCraft.httpRules = Collections.unmodifiableList(
+                listOf(
+                    AddressRule.parse("\$private", null, Action.DENY.toPartial()),
+                    AddressRule.parse("*", null, Action.ALLOW.toPartial())
+                )
+            )
+        }
+    }
+
+    @Test
+    fun `Connects to websocket`() {
+        AsyncRunner.runTest {
+            val httpApi = addApi(HTTPAPI(this))
+
+            val result = httpApi.websocket(WS_ADDRESS, Optional.empty())
+            assertArrayEquals(arrayOf(true), result, "Should have created websocket")
+
+            val event = pullEvent()
+            assertEquals("websocket_success", event.name) {
+                "Websocket failed to connect: ${event.args.contentToString()}"
+            }
+        }
+    }
+}

src/test/java/dan200/computercraft/ingame/CraftOsTest.kt

@@ -0,0 +1,13 @@
+package dan200.computercraft.ingame
+
+import dan200.computercraft.ingame.api.GameTest
+import dan200.computercraft.ingame.api.TestContext
+import dan200.computercraft.ingame.api.checkComputerOk
+
+class CraftOsTest {
+    /**
+     * Sends a rednet message to another a computer and back again.
+     */
+    @GameTest
+    suspend fun `Sends basic rednet messages`(context: TestContext) = context.checkComputerOk(13)
+}

src/test/java/dan200/computercraft/ingame/MonitorTest.kt

@@ -0,0 +1,39 @@
+package dan200.computercraft.ingame
+
+import dan200.computercraft.ingame.api.*
+import dan200.computercraft.shared.Registry
+import dan200.computercraft.shared.peripheral.monitor.TileMonitor
+import net.minecraft.block.Blocks
+import net.minecraft.command.arguments.BlockStateInput
+import net.minecraft.nbt.CompoundNBT
+import net.minecraft.util.math.BlockPos
+import org.junit.jupiter.api.Assertions.assertEquals
+import org.junit.jupiter.api.fail
+import java.util.*
+
+class MonitorTest {
+    @GameTest
+    suspend fun `Ensures valid on place`(context: TestContext) {
+        val pos = BlockPos(2, 0, 2)
+        val tag = CompoundNBT()
+        tag.putInt("Width", 2)
+        tag.putInt("Height", 2)
+
+        val toSet = BlockStateInput(
+            Registry.ModBlocks.MONITOR_ADVANCED.get().defaultBlockState(),
+            Collections.emptySet(),
+            tag
+        )
+
+        context.setBlock(pos, Blocks.AIR.defaultBlockState())
+        context.setBlock(pos, toSet)
+
+        context.sleep(2)
+
+        val tile = context.getTile(pos)
+        if (tile !is TileMonitor) fail("Expected tile to be monitor, is $tile")
+
+        assertEquals(1, tile.width, "Width should be 1")
+        assertEquals(1, tile.height, "Width should be 1")
+    }
+}

src/test/java/dan200/computercraft/ingame/api/TestExtensions.kt

@@ -3,6 +3,7 @@ package dan200.computercraft.ingame.api
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.delay
 import net.minecraft.block.BlockState
+import net.minecraft.command.arguments.BlockStateInput
 import net.minecraft.entity.Entity
 import net.minecraft.tileentity.TileEntity
 import net.minecraft.util.math.AxisAlignedBB
@@ -54,6 +55,11 @@ fun TestContext.setBlock(pos: BlockPos, state: BlockState) {
     tracker.level.setBlockAndUpdate(offset(pos), state)
 }
 
+/**
+ * Set a block within the test structure.
+ */
+fun TestContext.setBlock(pos: BlockPos, state: BlockStateInput) = state.place(tracker.level, offset(pos), 3)
+
 /**
  * Modify a block state within the test.
  */

src/test/server-files/computers/computer/11/startup.lua

@@ -1,3 +1,5 @@
+-- TurtleTest.`Use compostors`
+
 test.eq(true, turtle.dropDown(), "Drop items into compostor")
 
 test.ok()

src/test/server-files/computers/computer/12/startup.lua

@@ -1,3 +1,5 @@
+-- TurtleTest.`Cleaned with cauldrons`
+
 local old_details = turtle.getItemDetail(1, true)
 
 test.assert(turtle.place(), "Dyed turtle")

src/test/server-files/computers/computer/13/startup.lua

@@ -0,0 +1,14 @@
+-- CraftOsTest.`Sends basic rednet messages`
+
+rednet.open("top")
+
+local id, msg
+repeat
+    rednet.send(14, "Test msg") -- Keep sending, as other computer may not have started yet.
+
+    id, msg = rednet.receive(nil, 1)
+    print(id, msg)
+until id == 14
+
+test.eq("Test msg", msg)
+test.ok()

src/test/server-files/computers/computer/14/startup.lua

@@ -0,0 +1,7 @@
+-- CraftOsTest.`Sends basic rednet messages`
+
+rednet.open("top")
+while true do
+    local id, msg, protocol = rednet.receive()
+    rednet.send(id, msg, protocol)
+end

src/test/server-files/computers/ids.json

@@ -1,3 +1,3 @@
 {
-  "computer": 12
+  "computer": 14
 }

src/test/server-files/structures/craft_os_test.sends_basic_rednet_messages.snbt

@@ -0,0 +1,555 @@
+{
+    size: [5, 5, 5],
+    entities: [],
+    blocks: [
+        {
+            pos: [0, 0, 0],
+            state: 0
+        },
+        {
+            pos: [1, 0, 0],
+            state: 0
+        },
+        {
+            pos: [2, 0, 0],
+            state: 0
+        },
+        {
+            pos: [3, 0, 0],
+            state: 0
+        },
+        {
+            pos: [4, 0, 0],
+            state: 0
+        },
+        {
+            pos: [0, 0, 1],
+            state: 0
+        },
+        {
+            pos: [1, 0, 1],
+            state: 0
+        },
+        {
+            pos: [2, 0, 1],
+            state: 0
+        },
+        {
+            pos: [3, 0, 1],
+            state: 0
+        },
+        {
+            pos: [4, 0, 1],
+            state: 0
+        },
+        {
+            pos: [0, 0, 2],
+            state: 0
+        },
+        {
+            pos: [1, 0, 2],
+            state: 0
+        },
+        {
+            pos: [2, 0, 2],
+            state: 0
+        },
+        {
+            pos: [3, 0, 2],
+            state: 0
+        },
+        {
+            pos: [4, 0, 2],
+            state: 0
+        },
+        {
+            pos: [0, 0, 3],
+            state: 0
+        },
+        {
+            pos: [1, 0, 3],
+            state: 0
+        },
+        {
+            pos: [2, 0, 3],
+            state: 0
+        },
+        {
+            pos: [3, 0, 3],
+            state: 0
+        },
+        {
+            pos: [4, 0, 3],
+            state: 0
+        },
+        {
+            pos: [0, 0, 4],
+            state: 0
+        },
+        {
+            pos: [1, 0, 4],
+            state: 0
+        },
+        {
+            pos: [2, 0, 4],
+            state: 0
+        },
+        {
+            pos: [3, 0, 4],
+            state: 0
+        },
+        {
+            pos: [4, 0, 4],
+            state: 0
+        },
+        {
+            nbt: {
+                Label: "Echo",
+                id: "computercraft:computer_advanced",
+                ComputerId: 14,
+                On: 1b
+            },
+            pos: [1, 1, 2],
+            state: 1
+        },
+        {
+            nbt: {
+                Label: "Main",
+                id: "computercraft:computer_advanced",
+                ComputerId: 13,
+                On: 1b
+            },
+            pos: [3, 1, 2],
+            state: 2
+        },
+        {
+            nbt: {
+                id: "computercraft:wireless_modem_normal"
+            },
+            pos: [1, 2, 2],
+            state: 3
+        },
+        {
+            nbt: {
+                id: "computercraft:wireless_modem_normal"
+            },
+            pos: [3, 2, 2],
+            state: 3
+        },
+        {
+            pos: [0, 1, 0],
+            state: 4
+        },
+        {
+            pos: [1, 1, 0],
+            state: 4
+        },
+        {
+            pos: [2, 1, 0],
+            state: 4
+        },
+        {
+            pos: [3, 1, 0],
+            state: 4
+        },
+        {
+            pos: [4, 1, 0],
+            state: 4
+        },
+        {
+            pos: [0, 2, 0],
+            state: 4
+        },
+        {
+            pos: [1, 2, 0],
+            state: 4
+        },
+        {
+            pos: [2, 2, 0],
+            state: 4
+        },
+        {
+            pos: [3, 2, 0],
+            state: 4
+        },
+        {
+            pos: [4, 2, 0],
+            state: 4
+        },
+        {
+            pos: [0, 3, 0],
+            state: 4
+        },
+        {
+            pos: [1, 3, 0],
+            state: 4
+        },
+        {
+            pos: [2, 3, 0],
+            state: 4
+        },
+        {
+            pos: [3, 3, 0],
+            state: 4
+        },
+        {
+            pos: [4, 3, 0],
+            state: 4
+        },
+        {
+            pos: [0, 4, 0],
+            state: 4
+        },
+        {
+            pos: [1, 4, 0],
+            state: 4
+        },
+        {
+            pos: [2, 4, 0],
+            state: 4
+        },
+        {
+            pos: [3, 4, 0],
+            state: 4
+        },
+        {
+            pos: [4, 4, 0],
+            state: 4
+        },
+        {
+            pos: [0, 1, 1],
+            state: 4
+        },
+        {
+            pos: [1, 1, 1],
+            state: 4
+        },
+        {
+            pos: [2, 1, 1],
+            state: 4
+        },
+        {
+            pos: [3, 1, 1],
+            state: 4
+        },
+        {
+            pos: [4, 1, 1],
+            state: 4
+        },
+        {
+            pos: [0, 2, 1],
+            state: 4
+        },
+        {
+            pos: [1, 2, 1],
+            state: 4
+        },
+        {
+            pos: [2, 2, 1],
+            state: 4
+        },
+        {
+            pos: [3, 2, 1],
+            state: 4
+        },
+        {
+            pos: [4, 2, 1],
+            state: 4
+        },
+        {
+            pos: [0, 3, 1],
+            state: 4
+        },
+        {
+            pos: [1, 3, 1],
+            state: 4
+        },
+        {
+            pos: [2, 3, 1],
+            state: 4
+        },
+        {
+            pos: [3, 3, 1],
+            state: 4
+        },
+        {
+            pos: [4, 3, 1],
+            state: 4
+        },
+        {
+            pos: [0, 4, 1],
+            state: 4
+        },
+        {
+            pos: [1, 4, 1],
+            state: 4
+        },
+        {
+            pos: [2, 4, 1],
+            state: 4
+        },
+        {
+            pos: [3, 4, 1],
+            state: 4
+        },
+        {
+            pos: [4, 4, 1],
+            state: 4
+        },
+        {
+            pos: [0, 1, 2],
+            state: 4
+        },
+        {
+            pos: [2, 1, 2],
+            state: 4
+        },
+        {
+            pos: [4, 1, 2],
+            state: 4
+        },
+        {
+            pos: [0, 2, 2],
+            state: 4
+        },
+        {
+            pos: [2, 2, 2],
+            state: 4
+        },
+        {
+            pos: [4, 2, 2],
+            state: 4
+        },
+        {
+            pos: [0, 3, 2],
+            state: 4
+        },
+        {
+            pos: [1, 3, 2],
+            state: 4
+        },
+        {
+            pos: [2, 3, 2],
+            state: 4
+        },
+        {
+            pos: [3, 3, 2],
+            state: 4
+        },
+        {
+            pos: [4, 3, 2],
+            state: 4
+        },
+        {
+            pos: [0, 4, 2],
+            state: 4
+        },
+        {
+            pos: [1, 4, 2],
+            state: 4
+        },
+        {
+            pos: [2, 4, 2],
+            state: 4
+        },
+        {
+            pos: [3, 4, 2],
+            state: 4
+        },
+        {
+            pos: [4, 4, 2],
+            state: 4
+        },
+        {
+            pos: [0, 1, 3],
+            state: 4
+        },
+        {
+            pos: [1, 1, 3],
+            state: 4
+        },
+        {
+            pos: [2, 1, 3],
+            state: 4
+        },
+        {
+            pos: [3, 1, 3],
+            state: 4
+        },
+        {
+            pos: [4, 1, 3],
+            state: 4
+        },
+        {
+            pos: [0, 2, 3],
+            state: 4
+        },
+        {
+            pos: [1, 2, 3],
+            state: 4
+        },
+        {
+            pos: [2, 2, 3],
+            state: 4
+        },
+        {
+            pos: [3, 2, 3],
+            state: 4
+        },
+        {
+            pos: [4, 2, 3],
+            state: 4
+        },
+        {
+            pos: [0, 3, 3],
+            state: 4
+        },
+        {
+            pos: [1, 3, 3],
+            state: 4
+        },
+        {
+            pos: [2, 3, 3],
+            state: 4
+        },
+        {
+            pos: [3, 3, 3],
+            state: 4
+        },
+        {
+            pos: [4, 3, 3],
+            state: 4
+        },
+        {
+            pos: [0, 4, 3],
+            state: 4
+        },
+        {
+            pos: [1, 4, 3],
+            state: 4
+        },
+        {
+            pos: [2, 4, 3],
+            state: 4
+        },
+        {
+            pos: [3, 4, 3],
+            state: 4
+        },
+        {
+            pos: [4, 4, 3],
+            state: 4
+        },
+        {
+            pos: [0, 1, 4],
+            state: 4
+        },
+        {
+            pos: [1, 1, 4],
+            state: 4
+        },
+        {
+            pos: [2, 1, 4],
+            state: 4
+        },
+        {
+            pos: [3, 1, 4],
+            state: 4
+        },
+        {
+            pos: [4, 1, 4],
+            state: 4
+        },
+        {
+            pos: [0, 2, 4],
+            state: 4
+        },
+        {
+            pos: [1, 2, 4],
+            state: 4
+        },
+        {
+            pos: [2, 2, 4],
+            state: 4
+        },
+        {
+            pos: [3, 2, 4],
+            state: 4
+        },
+        {
+            pos: [4, 2, 4],
+            state: 4
+        },
+        {
+            pos: [0, 3, 4],
+            state: 4
+        },
+        {
+            pos: [1, 3, 4],
+            state: 4
+        },
+        {
+            pos: [2, 3, 4],
+            state: 4
+        },
+        {
+            pos: [3, 3, 4],
+            state: 4
+        },
+        {
+            pos: [4, 3, 4],
+            state: 4
+        },
+        {
+            pos: [0, 4, 4],
+            state: 4
+        },
+        {
+            pos: [1, 4, 4],
+            state: 4
+        },
+        {
+            pos: [2, 4, 4],
+            state: 4
+        },
+        {
+            pos: [3, 4, 4],
+            state: 4
+        },
+        {
+            pos: [4, 4, 4],
+            state: 4
+        }
+    ],
+    palette: [
+        {
+            Name: "minecraft:polished_andesite"
+        },
+        {
+            Properties: {
+                facing: "north",
+                state: "on"
+            },
+            Name: "computercraft:computer_advanced"
+        },
+        {
+            Properties: {
+                facing: "north",
+                state: "blinking"
+            },
+            Name: "computercraft:computer_advanced"
+        },
+        {
+            Properties: {
+                waterlogged: "false",
+                facing: "down",
+                on: "true"
+            },
+            Name: "computercraft:wireless_modem_normal"
+        },
+        {
+            Name: "minecraft:air"
+        }
+    ],
+    DataVersion: 2230
+}

src/test/server-files/structures/monitor_test.ensures_valid_on_place.snbt

@@ -0,0 +1,515 @@
+{
+    size: [5, 5, 5],
+    entities: [],
+    blocks: [
+        {
+            pos: [0, 0, 0],
+            state: 0
+        },
+        {
+            pos: [1, 0, 0],
+            state: 0
+        },
+        {
+            pos: [2, 0, 0],
+            state: 0
+        },
+        {
+            pos: [3, 0, 0],
+            state: 0
+        },
+        {
+            pos: [4, 0, 0],
+            state: 0
+        },
+        {
+            pos: [0, 0, 1],
+            state: 0
+        },
+        {
+            pos: [1, 0, 1],
+            state: 0
+        },
+        {
+            pos: [2, 0, 1],
+            state: 0
+        },
+        {
+            pos: [3, 0, 1],
+            state: 0
+        },
+        {
+            pos: [4, 0, 1],
+            state: 0
+        },
+        {
+            pos: [0, 0, 2],
+            state: 0
+        },
+        {
+            pos: [1, 0, 2],
+            state: 0
+        },
+        {
+            pos: [2, 0, 2],
+            state: 0
+        },
+        {
+            pos: [3, 0, 2],
+            state: 0
+        },
+        {
+            pos: [4, 0, 2],
+            state: 0
+        },
+        {
+            pos: [0, 0, 3],
+            state: 0
+        },
+        {
+            pos: [1, 0, 3],
+            state: 0
+        },
+        {
+            pos: [2, 0, 3],
+            state: 0
+        },
+        {
+            pos: [3, 0, 3],
+            state: 0
+        },
+        {
+            pos: [4, 0, 3],
+            state: 0
+        },
+        {
+            pos: [0, 0, 4],
+            state: 0
+        },
+        {
+            pos: [1, 0, 4],
+            state: 0
+        },
+        {
+            pos: [2, 0, 4],
+            state: 0
+        },
+        {
+            pos: [3, 0, 4],
+            state: 0
+        },
+        {
+            pos: [4, 0, 4],
+            state: 0
+        },
+        {
+            pos: [0, 1, 0],
+            state: 1
+        },
+        {
+            pos: [1, 1, 0],
+            state: 1
+        },
+        {
+            pos: [2, 1, 0],
+            state: 1
+        },
+        {
+            pos: [3, 1, 0],
+            state: 1
+        },
+        {
+            pos: [4, 1, 0],
+            state: 1
+        },
+        {
+            pos: [0, 2, 0],
+            state: 1
+        },
+        {
+            pos: [1, 2, 0],
+            state: 1
+        },
+        {
+            pos: [2, 2, 0],
+            state: 1
+        },
+        {
+            pos: [3, 2, 0],
+            state: 1
+        },
+        {
+            pos: [4, 2, 0],
+            state: 1
+        },
+        {
+            pos: [0, 3, 0],
+            state: 1
+        },
+        {
+            pos: [1, 3, 0],
+            state: 1
+        },
+        {
+            pos: [2, 3, 0],
+            state: 1
+        },
+        {
+            pos: [3, 3, 0],
+            state: 1
+        },
+        {
+            pos: [4, 3, 0],
+            state: 1
+        },
+        {
+            pos: [0, 4, 0],
+            state: 1
+        },
+        {
+            pos: [1, 4, 0],
+            state: 1
+        },
+        {
+            pos: [2, 4, 0],
+            state: 1
+        },
+        {
+            pos: [3, 4, 0],
+            state: 1
+        },
+        {
+            pos: [4, 4, 0],
+            state: 1
+        },
+        {
+            pos: [0, 1, 1],
+            state: 1
+        },
+        {
+            pos: [1, 1, 1],
+            state: 1
+        },
+        {
+            pos: [2, 1, 1],
+            state: 1
+        },
+        {
+            pos: [3, 1, 1],
+            state: 1
+        },
+        {
+            pos: [4, 1, 1],
+            state: 1
+        },
+        {
+            pos: [0, 2, 1],
+            state: 1
+        },
+        {
+            pos: [1, 2, 1],
+            state: 1
+        },
+        {
+            pos: [2, 2, 1],
+            state: 1
+        },
+        {
+            pos: [3, 2, 1],
+            state: 1
+        },
+        {
+            pos: [4, 2, 1],
+            state: 1
+        },
+        {
+            pos: [0, 3, 1],
+            state: 1
+        },
+        {
+            pos: [1, 3, 1],
+            state: 1
+        },
+        {
+            pos: [2, 3, 1],
+            state: 1
+        },
+        {
+            pos: [3, 3, 1],
+            state: 1
+        },
+        {
+            pos: [4, 3, 1],
+            state: 1
+        },
+        {
+            pos: [0, 4, 1],
+            state: 1
+        },
+        {
+            pos: [1, 4, 1],
+            state: 1
+        },
+        {
+            pos: [2, 4, 1],
+            state: 1
+        },
+        {
+            pos: [3, 4, 1],
+            state: 1
+        },
+        {
+            pos: [4, 4, 1],
+            state: 1
+        },
+        {
+            pos: [0, 1, 2],
+            state: 1
+        },
+        {
+            pos: [1, 1, 2],
+            state: 1
+        },
+        {
+            pos: [2, 1, 2],
+            state: 1
+        },
+        {
+            pos: [3, 1, 2],
+            state: 1
+        },
+        {
+            pos: [4, 1, 2],
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+    ],
+    DataVersion: 2230
+}