Merge branch 'abstraction'

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,26 @@
+---
+name: Bug report
+about: Create a bug report so we can fix it
+
+---
+
+**Describe the bug, provide any errors**
+A clear and concise description of what the bug is. Can you https://hastebin.com the error?
+
+**How can we reproduce it?**
+Steps to reproduce the behavior:
+1. Login on 1.12'
+2. Click on '....'
+3. The '....' is displayed wrong
+
+**Expected behaviour**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**ViaVersion Dump:**
+- Type /viaversion dump, and put the link here.
+
+**Additional server info**
+Do you use a proxy (eg. BungeeCord)? What software do you use and what plugins?

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,17 @@
+---
+name: Feature request
+about: Suggest an idea for ViaVersion
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Which versions is this for?**
+Does the feature apply to any specific versions? If so put them here.

build.gradle.kts

@@ -9,13 +9,13 @@ plugins {
 
 group = "com.github.creeper123123321.viafabric"
 val gitVersion: groovy.lang.Closure<Any> by extra
-version = "0.1.0-SNAPSHOT+" + try {
+version = "0.2.0-SNAPSHOT+" + try {
     gitVersion()
 } catch (e: Exception) {
     "unknown"
 }
 extra.set("archivesBaseName", "ViaFabric")
-description = "Client-side and server-side ViaVersion for Fabric"
+description = "Client-side and server-side ViaVersion implementation for Fabric"
 
 java {
     sourceCompatibility = JavaVersion.VERSION_1_8
@@ -46,8 +46,8 @@ tasks.named<ProcessResources>("processResources") {
 
 dependencies {
     // transitive = false because Guava is conflicting on runClient
-    compile("us.myles:viaversion:2.1.4-19w42a") { isTransitive = false }
+    compile("us.myles:viaversion:3.0.0-SNAPSHOT") { isTransitive = false }
-    include("us.myles:viaversion:2.1.4-19w42a")
+    //include("us.myles:viaversion:3.0.0-SNAPSHOT")
 
     compileOnly("com.google.code.findbugs:jsr305:3.0.2")
 

src/main/java/com/github/creeper123123321/viafabric/handler/CommonTransformer.java

@@ -0,0 +1,85 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2018 creeper123123321 and contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package com.github.creeper123123321.viafabric.handler;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.exception.CancelException;
+import us.myles.ViaVersion.packets.Direction;
+import us.myles.ViaVersion.protocols.base.ProtocolInfo;
+
+import java.util.function.Function;
+
+// TODO delete this when https://github.com/ViaVersion/ViaVersion/pull/1505 is merged
+public class CommonTransformer {
+    public static final String HANDLER_DECODER_NAME = "via-decoder";
+    public static final String HANDLER_ENCODER_NAME = "via-encoder";
+
+    public static boolean preServerboundCheck(UserConnection user) {
+        // Ignore if pending disconnect
+        if (user.isPendingDisconnect()) return true;
+        // Increment received + Check PPS
+        return user.incrementReceived() && user.handlePPS();
+    }
+
+    public static void preClientbound(UserConnection user) {
+        user.incrementSent();
+    }
+
+    public static boolean willTransformPacket(UserConnection user) {
+        return user.isActive();
+    }
+
+    public static void transformClientbound(ByteBuf draft, UserConnection user, Function<Throwable, Exception> cancelSupplier) throws Exception {
+        if (!draft.isReadable()) return;
+        transform(draft, user, Direction.OUTGOING, cancelSupplier);
+    }
+
+    public static void transformServerbound(ByteBuf draft, UserConnection user, Function<Throwable, Exception> cancelSupplier) throws Exception {
+        if (!draft.isReadable()) return;
+        transform(draft, user, Direction.INCOMING, cancelSupplier);
+    }
+
+    private static void transform(ByteBuf draft, UserConnection user, Direction direction, Function<Throwable, Exception> cancelSupplier) throws Exception {
+        int id = Type.VAR_INT.read(draft);
+        if (id == PacketWrapper.PASSTHROUGH_ID) return;
+        PacketWrapper wrapper = new PacketWrapper(id, draft, user);
+        ProtocolInfo protInfo = user.get(ProtocolInfo.class);
+        try {
+            protInfo.getPipeline().transform(direction, protInfo.getState(), wrapper);
+        } catch (CancelException ex) {
+            throw cancelSupplier.apply(ex);
+        }
+        ByteBuf transformed = draft.alloc().buffer();
+        try {
+            wrapper.writeToBuffer(transformed);
+            draft.clear().writeBytes(transformed);
+        } finally {
+            transformed.release();
+        }
+    }
+}

src/main/java/com/github/creeper123123321/viafabric/handler/clientside/VRDecodeHandler.java

@@ -24,71 +24,39 @@
 
 package com.github.creeper123123321.viafabric.handler.clientside;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.ByteToMessageDecoder;
-import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.Via;
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.type.Type;
 import us.myles.ViaVersion.exception.CancelException;
-import us.myles.ViaVersion.packets.Direction;
 import us.myles.ViaVersion.protocols.base.ProtocolInfo;
 import us.myles.ViaVersion.util.PipelineUtil;
 
-import java.lang.reflect.InvocationTargetException;
 import java.util.List;
 
 public class VRDecodeHandler extends ByteToMessageDecoder {
     private UserConnection user;
-    private ByteToMessageDecoder minecraftDecoder;
 
-    public VRDecodeHandler(UserConnection user, ByteToMessageDecoder minecraftDecoder) {
+    public VRDecodeHandler(UserConnection user) {
         this.user = user;
-        this.minecraftDecoder = minecraftDecoder;
     }
 
     @Override
     protected void decode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) throws Exception {
-        // Based on ViaVersion Sponge encoder code
+        CommonTransformer.preClientbound(user);
-
+        if (!CommonTransformer.willTransformPacket(user)) {
-        ByteBuf buf = msg.alloc().buffer().writeBytes(msg);
+            out.add(msg.readRetainedSlice(msg.readableBytes()));
-
+            return;
-        // Increment sent
-        user.incrementSent();
-        if (user.isActive()) {
-            // Handle ID
-            int id = Type.VAR_INT.read(buf);
-
-            if (id != PacketWrapper.PASSTHROUGH_ID) {
-                // Transform
-                ByteBuf newPacket = buf.alloc().buffer();
-                try {
-                    PacketWrapper wrapper = new PacketWrapper(id, buf, user);
-                    ProtocolInfo protInfo = user.get(ProtocolInfo.class);
-                    protInfo.getPipeline().transform(Direction.OUTGOING, protInfo.getState(), wrapper);
-                    wrapper.writeToBuffer(newPacket);
-                    buf.clear();
-                    buf.writeBytes(newPacket);
-                } catch (Exception e) {
-                    buf.release();
-                    throw e;
-                } finally {
-                    newPacket.release();
-                }
-            }
         }
-
+        ByteBuf draft = msg.alloc().buffer().writeBytes(msg);
-        // call minecraft encoder
         try {
-            out.addAll(PipelineUtil.callDecode(this.minecraftDecoder, ctx, buf));
+            CommonTransformer.transformClientbound(draft, user, ignored -> CancelException.CACHED);
-        } catch (InvocationTargetException e) {
+            out.add(draft.retain());
-            e.printStackTrace();
+        } finally {
-            if (e.getCause() instanceof Exception) {
+            draft.release();
-                throw (Exception) e.getCause();
-            }
         }
-        buf.release();
     }
 
     @Override
@@ -98,12 +66,8 @@ public class VRDecodeHandler extends ByteToMessageDecoder {
     }
 
     @Override
-    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
+    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
-        super.channelRead(ctx, msg);
+        super.channelInactive(ctx);
-    }
-
-    @Override
-    public void channelInactive(ChannelHandlerContext ctx) {
         ProtocolInfo info = user.get(ProtocolInfo.class);
         if (info.getUuid() != null) {
             Via.getManager().removePortedClient(info.getUuid());

src/main/java/com/github/creeper123123321/viafabric/handler/clientside/VREncodeHandler.java

@@ -24,81 +24,39 @@
 
 package com.github.creeper123123321.viafabric.handler.clientside;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.channel.ChannelPromise;
+import io.netty.handler.codec.MessageToMessageEncoder;
-import io.netty.handler.codec.MessageToByteEncoder;
-import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.type.Type;
 import us.myles.ViaVersion.exception.CancelException;
-import us.myles.ViaVersion.packets.Direction;
-import us.myles.ViaVersion.protocols.base.ProtocolInfo;
 import us.myles.ViaVersion.util.PipelineUtil;
 
-import java.lang.reflect.InvocationTargetException;
+import java.util.List;
 
-public class VREncodeHandler extends MessageToByteEncoder {
+public class VREncodeHandler extends MessageToMessageEncoder<ByteBuf> {
     private UserConnection user;
-    private MessageToByteEncoder minecraftEncoder;
 
-    public VREncodeHandler(UserConnection user, MessageToByteEncoder minecraftEncoder) {
+    public VREncodeHandler(UserConnection user) {
         this.user = user;
-        this.minecraftEncoder = minecraftEncoder;
     }
 
     @Override
-    protected void encode(ChannelHandlerContext ctx, Object msg, ByteBuf out) throws Exception {
+    protected void encode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) throws Exception {
-        // Based on Sponge ViaVersion decoder code
+        if (CommonTransformer.preServerboundCheck(user)) {
-
+            throw CancelException.CACHED; // Theoretically a server with m2m decoder would hold this packet, but we'll just cancel for now and this is used for kicking packet spamming
-        ByteBuf pre = out.alloc().buffer();
+        }
-
+        if (!CommonTransformer.willTransformPacket(user)) {
-        // call minecraft encoder
+            out.add(msg.readRetainedSlice(msg.readableBytes()));
+            return;
+        }
+        ByteBuf draft = ctx.alloc().buffer().writeBytes(msg);
         try {
-            PipelineUtil.callEncode(this.minecraftEncoder, ctx, msg, pre);
+            CommonTransformer.transformServerbound(draft, user, ignored -> CancelException.CACHED);
-        } catch (InvocationTargetException e) {
+            out.add(draft.retain());
-            if (e.getCause() instanceof Exception) {
+        } finally {
-                throw (Exception) e.getCause();
+            draft.release();
-            }
         }
-
-        // use transformers
-        if (pre.readableBytes() > 0) {
-            // Ignore if pending disconnect
-            if (user.isPendingDisconnect()) {
-                return;
-            }
-            // Increment received
-            boolean second = user.incrementReceived();
-            // Check PPS
-            if (second && user.handlePPS())
-                return;
-
-            if (user.isActive()) {
-                // Handle ID
-                int id = Type.VAR_INT.read(pre);
-                // Transform
-                ByteBuf newPacket = pre.alloc().buffer();
-                try {
-                    if (id != PacketWrapper.PASSTHROUGH_ID) {
-                        PacketWrapper wrapper = new PacketWrapper(id, pre, user);
-                        ProtocolInfo protInfo = user.get(ProtocolInfo.class);
-                        protInfo.getPipeline().transform(Direction.INCOMING, protInfo.getState(), wrapper);
-                        wrapper.writeToBuffer(newPacket);
-                        pre.clear();
-                        pre.writeBytes(newPacket);
-                    }
-                } catch (Exception e) {
-                    pre.release();
-                    throw e;
-                } finally {
-                    newPacket.release();
-                }
-            }
-        }
-
-        out.writeBytes(pre);
-        pre.release();
     }
 
     @Override
@@ -106,9 +64,4 @@ public class VREncodeHandler extends MessageToByteEncoder {
         if (PipelineUtil.containsCause(cause, CancelException.class)) return;
         super.exceptionCaught(ctx, cause);
     }
-
-    @Override
-    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
-        super.write(ctx, msg, promise);
-    }
 }

src/main/java/com/github/creeper123123321/viafabric/handler/serverside/FabricDecodeHandler.java

@@ -24,85 +24,38 @@
 
 package com.github.creeper123123321.viafabric.handler.serverside;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.ByteToMessageDecoder;
-import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.Via;
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.type.Type;
 import us.myles.ViaVersion.exception.CancelException;
-import us.myles.ViaVersion.packets.Direction;
 import us.myles.ViaVersion.protocols.base.ProtocolInfo;
 import us.myles.ViaVersion.util.PipelineUtil;
 
-import java.lang.reflect.InvocationTargetException;
 import java.util.List;
 
 public class FabricDecodeHandler extends ByteToMessageDecoder {
-    // https://github.com/MylesIsCool/ViaVersion/blob/1abc3ebea66878192b08b577353dff7d619ed51e/sponge/src/main/java/us/myles/ViaVersion/sponge/handlers/SpongeDecodeHandler.java
+    private final UserConnection user;
-    private final ByteToMessageDecoder minecraftDecoder;
-    private final UserConnection info;
 
-    public FabricDecodeHandler(UserConnection info, ByteToMessageDecoder minecraftDecoder) {
+    public FabricDecodeHandler(UserConnection user) {
-        this.info = info;
+        this.user = user;
-        this.minecraftDecoder = minecraftDecoder;
     }
 
     @Override
-    protected void decode(ChannelHandlerContext ctx, ByteBuf bytebuf, List<Object> list) throws Exception {
+    protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
-        // use transformers
+        if (CommonTransformer.preServerboundCheck(user)) return;
-        if (bytebuf.readableBytes() > 0) {
+        if (!CommonTransformer.willTransformPacket(user)) {
-            // Ignore if pending disconnect
+            out.add(in.readRetainedSlice(in.readableBytes()));
-            if (info.isPendingDisconnect()) {
+            return;
-                return;
+        }
-            }
+        ByteBuf draft = ctx.alloc().buffer().writeBytes(in);
-            // Increment received
+        try {
-            boolean second = info.incrementReceived();
+            CommonTransformer.transformServerbound(draft, user, ignored -> CancelException.CACHED);
-            // Check PPS
+            out.add(draft.retain());
-            if (second) {
+        } finally {
-                if (info.handlePPS())
+            draft.release();
-                    return;
-            }
-
-            if (info.isActive()) {
-                // Handle ID
-                int id = Type.VAR_INT.read(bytebuf);
-                // Transform
-                ByteBuf newPacket = ctx.alloc().buffer();
-                try {
-                    if (id == PacketWrapper.PASSTHROUGH_ID) {
-                        newPacket.writeBytes(bytebuf);
-                    } else {
-                        PacketWrapper wrapper = new PacketWrapper(id, bytebuf, info);
-                        ProtocolInfo protInfo = info.get(ProtocolInfo.class);
-                        protInfo.getPipeline().transform(Direction.INCOMING, protInfo.getState(), wrapper);
-                        wrapper.writeToBuffer(newPacket);
-                    }
-
-                    bytebuf.clear();
-                    bytebuf = newPacket;
-                } catch (Exception e) {
-                    // Clear Buffer
-                    bytebuf.clear();
-                    // Release Packet, be free!
-                    newPacket.release();
-                    throw e;
-                }
-            }
-
-            // call minecraft decoder
-            try {
-                list.addAll(PipelineUtil.callDecode(this.minecraftDecoder, ctx, bytebuf));
-            } catch (InvocationTargetException e) {
-                if (e.getCause() instanceof Exception) {
-                    throw (Exception) e.getCause();
-                }
-            } finally {
-                if (info.isActive()) {
-                    bytebuf.release();
-                }
-            }
         }
     }
 
@@ -113,8 +66,9 @@ public class FabricDecodeHandler extends ByteToMessageDecoder {
     }
 
     @Override
-    public void channelInactive(ChannelHandlerContext ctx) {
+    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
-        ProtocolInfo pi = info.get(ProtocolInfo.class);
+        super.channelInactive(ctx); // May call decode
+        ProtocolInfo pi = user.get(ProtocolInfo.class);
         if (pi.getUuid() != null) {
             Via.getManager().removePortedClient(pi.getUuid());
         }

src/main/java/com/github/creeper123123321/viafabric/handler/serverside/FabricEncodeHandler.java

@@ -24,66 +24,36 @@
 
 package com.github.creeper123123321.viafabric.handler.serverside;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.ChannelHandlerContext;
-import io.netty.handler.codec.MessageToByteEncoder;
+import io.netty.handler.codec.MessageToMessageEncoder;
-import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.type.Type;
 import us.myles.ViaVersion.exception.CancelException;
-import us.myles.ViaVersion.packets.Direction;
-import us.myles.ViaVersion.protocols.base.ProtocolInfo;
 import us.myles.ViaVersion.util.PipelineUtil;
 
-import java.lang.reflect.InvocationTargetException;
+import java.util.List;
 
-public class FabricEncodeHandler extends MessageToByteEncoder {
+public class FabricEncodeHandler extends MessageToMessageEncoder<ByteBuf> {
-    // https://github.com/MylesIsCool/ViaVersion/blob/master/sponge/src/main/java/us/myles/ViaVersion/sponge/handlers/SpongeEncodeHandler.java
+    private final UserConnection user;
-    private final UserConnection info;
-    private final MessageToByteEncoder minecraftEncoder;
 
-    public FabricEncodeHandler(UserConnection info, MessageToByteEncoder minecraftEncoder) {
+    public FabricEncodeHandler(UserConnection user) {
-        this.info = info;
+        this.user = user;
-        this.minecraftEncoder = minecraftEncoder;
     }
 
-
     @Override
-    protected void encode(final ChannelHandlerContext ctx, Object o, final ByteBuf bytebuf) throws Exception {
+    protected void encode(final ChannelHandlerContext ctx, ByteBuf in, final List<Object> out) throws Exception {
-        // handle the packet type
+        CommonTransformer.preClientbound(user);
-        if (!(o instanceof ByteBuf)) {
+        if (!CommonTransformer.willTransformPacket(user)) {
-            // call minecraft encoder
+            out.add(in.readRetainedSlice(in.readableBytes()));
-            try {
+            return;
-                PipelineUtil.callEncode(this.minecraftEncoder, ctx, o, bytebuf);
-            } catch (InvocationTargetException e) {
-                if (e.getCause() instanceof Exception) {
-                    throw (Exception) e.getCause();
-                }
-            }
         }
-        if (bytebuf.readableBytes() == 0) {
+        ByteBuf draft = ctx.alloc().buffer().writeBytes(in);
-            throw new CancelException();
+        try {
-        }
+            CommonTransformer.transformClientbound(draft, user, ignored -> CancelException.CACHED);
-        // Increment sent
+            out.add(draft.retain());
-        info.incrementSent();
+        } finally {
-        if (info.isActive()) {
+            draft.release();
-            // Handle ID
-            int id = Type.VAR_INT.read(bytebuf);
-            // Transform
-            ByteBuf oldPacket = bytebuf.copy();
-            bytebuf.clear();
-
-            try {
-                PacketWrapper wrapper = new PacketWrapper(id, oldPacket, info);
-                ProtocolInfo protInfo = info.get(ProtocolInfo.class);
-                protInfo.getPipeline().transform(Direction.OUTGOING, protInfo.getState(), wrapper);
-                wrapper.writeToBuffer(bytebuf);
-            } catch (Exception e) {
-                bytebuf.clear();
-                throw e;
-            } finally {
-                oldPacket.release();
-            }
         }
     }
 
@@ -92,4 +62,4 @@ public class FabricEncodeHandler extends MessageToByteEncoder {
         if (PipelineUtil.containsCause(cause, CancelException.class)) return;
         super.exceptionCaught(ctx, cause);
     }
-}
+}

src/main/java/com/github/creeper123123321/viafabric/mixin/MixinClientConnection.java

@@ -24,6 +24,9 @@
 
 package com.github.creeper123123321.viafabric.mixin;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelPipeline;
 import net.minecraft.network.ClientConnection;
 import org.apache.logging.log4j.Logger;
 import org.spongepowered.asm.mixin.Mixin;
@@ -40,11 +43,33 @@ public class MixinClientConnection {
                     value = "INVOKE",
                     target = "Lorg/apache/logging/log4j/Logger;debug(Ljava/lang/String;Ljava/lang/Throwable;)V"
             ))
-    public void redirectDebug(Logger logger, String message, Throwable t) {
+    private void redirectDebug(Logger logger, String message, Throwable t) {
         if ("Failed to sent packet".equals(message)) {
             logger.info(message, t);
         } else {
             logger.debug(message, t);
         }
     }
+
+    @Redirect(method = "setMinCompressedSize", at = @At(
+            value = "INVOKE",
+            remap = false,
+            target = "Lio/netty/channel/ChannelPipeline;addBefore(Ljava/lang/String;Ljava/lang/String;Lio/netty/channel/ChannelHandler;)Lio/netty/channel/ChannelPipeline;"
+    ))
+    private ChannelPipeline decodeEncodePlacement(ChannelPipeline instance, String base, String newHandler, ChannelHandler handler) {
+        // Fixes the handler order
+        switch (base) {
+            case "decoder": {
+                if (instance.get(CommonTransformer.HANDLER_DECODER_NAME) != null)
+                    base = CommonTransformer.HANDLER_DECODER_NAME;
+                break;
+            }
+            case "encoder": {
+                if (instance.get(CommonTransformer.HANDLER_ENCODER_NAME) != null)
+                    base = CommonTransformer.HANDLER_ENCODER_NAME;
+                break;
+            }
+        }
+        return instance.addBefore(base, newHandler, handler);
+    }
 }

src/main/java/com/github/creeper123123321/viafabric/mixin/MixinServerNetworkIoChInit.java

@@ -24,12 +24,11 @@
 
 package com.github.creeper123123321.viafabric.mixin;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
 import com.github.creeper123123321.viafabric.handler.serverside.FabricDecodeHandler;
 import com.github.creeper123123321.viafabric.handler.serverside.FabricEncodeHandler;
 import io.netty.channel.Channel;
 import io.netty.channel.socket.SocketChannel;
-import io.netty.handler.codec.ByteToMessageDecoder;
-import io.netty.handler.codec.MessageToByteEncoder;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
@@ -45,11 +44,8 @@ public class MixinServerNetworkIoChInit {
             UserConnection user = new UserConnection(channel);
             new ProtocolPipeline(user);
 
-            MessageToByteEncoder oldEncoder = (MessageToByteEncoder) channel.pipeline().get("encoder");
+            channel.pipeline().addBefore("encoder", CommonTransformer.HANDLER_ENCODER_NAME, new FabricEncodeHandler(user));
-            ByteToMessageDecoder oldDecoder = (ByteToMessageDecoder) channel.pipeline().get("decoder");
+            channel.pipeline().addBefore("decoder", CommonTransformer.HANDLER_DECODER_NAME, new FabricDecodeHandler(user));
-
-            channel.pipeline().replace("encoder", "encoder", new FabricEncodeHandler(user, oldEncoder));
-            channel.pipeline().replace("decoder", "decoder", new FabricDecodeHandler(user, oldDecoder));
         }
     }
 }

src/main/java/com/github/creeper123123321/viafabric/mixin/client/MixinClientConnectionChInit.java

@@ -24,13 +24,12 @@
 
 package com.github.creeper123123321.viafabric.mixin.client;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
 import com.github.creeper123123321.viafabric.handler.clientside.VRDecodeHandler;
 import com.github.creeper123123321.viafabric.handler.clientside.VREncodeHandler;
 import com.github.creeper123123321.viafabric.platform.VRClientSideUserConnection;
 import io.netty.channel.Channel;
 import io.netty.channel.socket.SocketChannel;
-import io.netty.handler.codec.ByteToMessageDecoder;
-import io.netty.handler.codec.MessageToByteEncoder;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
@@ -46,11 +45,8 @@ public class MixinClientConnectionChInit {
             UserConnection user = new VRClientSideUserConnection(channel);
             new ProtocolPipeline(user);
 
-            MessageToByteEncoder oldEncoder = (MessageToByteEncoder) channel.pipeline().get("encoder");
+            channel.pipeline().addBefore("encoder", CommonTransformer.HANDLER_ENCODER_NAME, new VREncodeHandler(user));
-            ByteToMessageDecoder oldDecoder = (ByteToMessageDecoder) channel.pipeline().get("decoder");
+            channel.pipeline().addBefore("decoder", CommonTransformer.HANDLER_DECODER_NAME, new VRDecodeHandler(user));
-
-            channel.pipeline().replace("encoder", "encoder", new VREncodeHandler(user, oldEncoder));
-            channel.pipeline().replace("decoder", "decoder", new VRDecodeHandler(user, oldDecoder));
         }
     }
 }

src/main/java/com/github/creeper123123321/viafabric/platform/VRClientSideUserConnection.java

@@ -24,14 +24,11 @@
 
 package com.github.creeper123123321.viafabric.platform;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.Channel;
 import io.netty.channel.ChannelFuture;
-import us.myles.ViaVersion.api.PacketWrapper;
 import us.myles.ViaVersion.api.data.UserConnection;
-import us.myles.ViaVersion.api.type.Type;
-import us.myles.ViaVersion.util.PipelineUtil;
-
 
 public class VRClientSideUserConnection extends UserConnection {
     public VRClientSideUserConnection(Channel socketChannel) {
@@ -41,46 +38,28 @@ public class VRClientSideUserConnection extends UserConnection {
 
     @Override
     public void sendRawPacket(final ByteBuf packet, boolean currentThread) {
-        ByteBuf copy = packet.alloc().buffer();
+        Runnable act = () -> getChannel().pipeline().context(CommonTransformer.HANDLER_DECODER_NAME)
-        try {
+                .fireChannelRead(packet);
-            Type.VAR_INT.write(copy, PacketWrapper.PASSTHROUGH_ID);
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-        copy.writeBytes(packet);
-        packet.release();
-        final Channel channel = this.getChannel();
         if (currentThread) {
-            PipelineUtil.getPreviousContext("decoder", channel.pipeline()).fireChannelRead(copy);
+            act.run();
         } else {
-            channel.eventLoop().submit(() -> {
+            getChannel().eventLoop().execute(act);
-                PipelineUtil.getPreviousContext("decoder", channel.pipeline()).fireChannelRead(copy);
-            });
         }
     }
 
     @Override
     public ChannelFuture sendRawPacketFuture(ByteBuf packet) {
-        ByteBuf copy = packet.alloc().buffer();
+        getChannel().pipeline().context(CommonTransformer.HANDLER_DECODER_NAME).fireChannelRead(packet);
-        try {
+        return getChannel().newSucceededFuture();
-            Type.VAR_INT.write(copy, PacketWrapper.PASSTHROUGH_ID);
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-        copy.writeBytes(packet);
-        packet.release();
-        final Channel channel = this.getChannel();
-        PipelineUtil.getPreviousContext("decoder", channel.pipeline()).fireChannelRead(copy);
-        return channel.newSucceededFuture();
     }
 
     @Override
     public void sendRawPacketToServer(ByteBuf packet, boolean currentThread) {
         if (currentThread) {
-            getChannel().pipeline().context("encoder").writeAndFlush(packet);
+            getChannel().pipeline().context(CommonTransformer.HANDLER_ENCODER_NAME).writeAndFlush(packet);
         } else {
             getChannel().eventLoop().submit(() -> {
-                getChannel().pipeline().context("encoder").writeAndFlush(packet);
+                getChannel().pipeline().context(CommonTransformer.HANDLER_ENCODER_NAME).writeAndFlush(packet);
             });
         }
     }

src/main/java/com/github/creeper123123321/viafabric/platform/VRInjector.java

@@ -24,6 +24,7 @@
 
 package com.github.creeper123123321.viafabric.platform;
 
+import com.github.creeper123123321.viafabric.handler.CommonTransformer;
 import net.fabricmc.api.EnvType;
 import net.fabricmc.loader.api.FabricLoader;
 import net.minecraft.SharedConstants;
@@ -52,12 +53,12 @@ public class VRInjector implements ViaInjector {
 
     @Override
     public String getEncoderName() {
-        return "encoder";
+        return CommonTransformer.HANDLER_ENCODER_NAME;
     }
 
     @Override
     public String getDecoderName() {
-        return "decoder";
+        return CommonTransformer.HANDLER_DECODER_NAME;
     }
 
     @Override

src/main/java/com/github/creeper123123321/viafabric/platform/VRViaConfig.java

@@ -24,7 +24,7 @@
 
 package com.github.creeper123123321.viafabric.platform;
 
-import us.myles.ViaVersion.api.ViaVersionConfig;
+import us.myles.ViaVersion.AbstractViaConfig;
 import us.myles.ViaVersion.util.Config;
 
 import java.io.File;
@@ -33,7 +33,7 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 
-public class VRViaConfig extends Config implements ViaVersionConfig {
+public class VRViaConfig extends AbstractViaConfig {
     // Based on Sponge ViaVersion
     private static List<String> UNSUPPORTED = Arrays.asList("anti-xray-patch", "bungee-ping-interval",
             "bungee-ping-save", "bungee-servers", "quick-move-action-fix", "nms-player-ticking",
@@ -61,117 +61,11 @@ public class VRViaConfig extends Config implements ViaVersionConfig {
         return UNSUPPORTED;
     }
 
-    public boolean isCheckForUpdates() {
-        return getBoolean("checkforupdates", true);
-    }
-
-    @Override
-    public boolean isPreventCollision() {
-        return getBoolean("prevent-collision", true);
-    }
-
-    @Override
-    public boolean isNewEffectIndicator() {
-        return getBoolean("use-new-effect-indicator", true);
-    }
-
-    @Override
-    public boolean isShowNewDeathMessages() {
-        return getBoolean("use-new-deathmessages", true);
-    }
-
-    @Override
-    public boolean isSuppressMetadataErrors() {
-        return getBoolean("suppress-metadata-errors", false);
-    }
-
-    @Override
-    public boolean isShieldBlocking() {
-        return getBoolean("shield-blocking", true);
-    }
-
-    @Override
-    public boolean isHologramPatch() {
-        return getBoolean("hologram-patch", false);
-    }
-
-    @Override
-    public boolean isPistonAnimationPatch() {
-        return getBoolean("piston-animation-patch", false);
-    }
-
-    @Override
-    public boolean isBossbarPatch() {
-        return getBoolean("bossbar-patch", true);
-    }
-
-    @Override
-    public boolean isBossbarAntiflicker() {
-        return getBoolean("bossbar-anti-flicker", false);
-    }
-
-    @Override
-    @Deprecated
-    public boolean isUnknownEntitiesSuppressed() {
-        return false;
-    }
-
-    @Override
-    public double getHologramYOffset() {
-        return getDouble("hologram-y", -0.96D);
-    }
-
-    @Override
-    @Deprecated
-    public boolean isBlockBreakPatch() {
-        return false;
-    }
-
-    @Override
-    public int getMaxPPS() {
-        return getInt("max-pps", 800);
-    }
-
-    @Override
-    public String getMaxPPSKickMessage() {
-        return getString("max-pps-kick-msg", "Sending packets too fast? lag?");
-    }
-
-    @Override
-    public int getTrackingPeriod() {
-        return getInt("tracking-period", 6);
-    }
-
-    @Override
-    public int getWarningPPS() {
-        return getInt("tracking-warning-pps", 120);
-    }
-
-    @Override
-    public int getMaxWarnings() {
-        return getInt("tracking-max-warnings", 3);
-    }
-
-    @Override
-    public String getMaxWarningsKickMessage() {
-        return getString("tracking-max-kick-msg", "You are sending too many packets, :(");
-    }
-
     @Override
     public boolean isAntiXRay() {
         return false;
     }
 
-    @Override
-    public boolean isSendSupportedVersions() {
-        return getBoolean("send-supported-versions", false);
-    }
-
-    @Override
-    public boolean isStimulatePlayerTick() {
-        return getBoolean("simulate-pt", true);
-    }
-
     @Override
     public boolean isItemCache() {
         return false;
@@ -182,111 +76,16 @@ public class VRViaConfig extends Config implements ViaVersionConfig {
         return false;
     }
 
-    @Override
-    public boolean isReplacePistons() {
-        return getBoolean("replace-pistons", false);
-    }
-
-    @Override
-    public int getPistonReplacementId() {
-        return getInt("replacement-piston-id", 0);
-    }
-
-    public boolean isAutoTeam() {
-        // Collision has to be enabled first
-        return isPreventCollision() && getBoolean("auto-team", true);
-    }
-
-    @Override
-    public boolean isForceJsonTransform() {
-        return getBoolean("force-json-transform", false);
-    }
-
-    @Override
-    public boolean is1_12NBTArrayFix() {
-        return getBoolean("chat-nbt-fix", true);
-    }
-
     @Override
     public boolean is1_12QuickMoveActionFix() {
         return false;
     }
 
-    @Override
-    public List<Integer> getBlockedProtocols() {
-        return getIntegerList("block-protocols");
-    }
-
-    @Override
-    public String getBlockedDisconnectMsg() {
-        return getString("block-disconnect-msg", "You are using an unsupported Minecraft version!");
-    }
-
-    @Override
-    public String getReloadDisconnectMsg() {
-        return getString("reload-disconnect-msg", "Server reload, please rejoin!");
-    }
-
-    @Override
-    public boolean is1_13TeamColourFix() {
-        return getBoolean("team-colour-fix", true);
-    }
-
-    @Override
-    public boolean isSuppress1_13ConversionErrors() {
-        return getBoolean("suppress-1_13-conversion-errors", false);
-    }
-
-    @Override
-    public boolean isMinimizeCooldown() {
-        return this.getBoolean("minimize-cooldown", true);
-    }
-
-    @Override
-    public boolean isDisable1_13AutoComplete() {
-        return this.getBoolean("disable-1_13-auto-complete", false);
-    }
-
-    @Override
-    public boolean isServersideBlockConnections() {
-        return this.getBoolean("serverside-blockconnections", false);
-    }
-
     @Override
     public String getBlockConnectionMethod() {
         return "packet";
     }
 
-    @Override
-    public boolean isReduceBlockStorageMemory() {
-        return this.getBoolean("reduce-blockstorage-memory", false);
-    }
-
-    @Override
-    public boolean isStemWhenBlockAbove() {
-        return this.getBoolean("flowerstem-when-block-above", false);
-    }
-
-    @Override
-    public boolean isSnowCollisionFix() {
-        return this.getBoolean("fix-low-snow-collision", false);
-    }
-
-    @Override
-    public int get1_13TabCompleteDelay() {
-        return this.getInt("1_13-tab-complete-delay", 0);
-    }
-
-    @Override
-    public boolean isTruncate1_14Books() {
-        return this.getBoolean("truncate-1_14-books", false);
-    }
-
-    @Override
-    public boolean isLeftHandedHandling() {
-        return this.getBoolean("left-handed-handling", true);
-    }
-
     @Override
     public boolean is1_9HitboxFix() {
         return false;
@@ -296,19 +95,4 @@ public class VRViaConfig extends Config implements ViaVersionConfig {
     public boolean is1_14HitboxFix() {
         return false;
     }
-
+}
-    @Override
-    public boolean isNonFullBlockLightFix() {
-        return this.getBoolean("fix-non-full-blocklight", true);
-    }
-
-    @Override
-    public boolean is1_14HealthNaNFix() {
-        return this.getBoolean("fix-1_14-health-nan", true);
-    }
-
-    @Override
-    public boolean is1_15InstantRespawn() {
-        return this.getBoolean("use-1_15-instant-respawn", false);
-    }
-}

src/main/resources/fabric.mod.json

@@ -10,7 +10,6 @@
     "issues": "https://github.com/ViaVersion/ViaFabric/issues",
     "sources": "https://github.com/ViaVersion/ViaFabric"
   },
-  "icon": "assets/viaversion/textures/logo.png",
   "environment": "*",
   "authors": [
     "creeper123123321"
@@ -27,7 +26,8 @@
     "fabricloader": ">=0.4.0",
     "fabric-textures-v0": "*",
     "fabric-resource-loader-v0": "*",
-    "fabric-commands-v0": "*"
+    "fabric-commands-v0": "*",
+    "viaversion": ">=3.0.0-SNAPSHOT"
   },
   "recommends": {
     "cotton-client-commands": "*"

src/main/resources/mixins.viafabric.json

@@ -3,8 +3,8 @@
   "compatibilityLevel": "JAVA_8",
   "package": "com.github.creeper123123321.viafabric.mixin",
   "mixins": [
-    "MixinServerNetworkIoChInit",
+    "MixinClientConnection",
-    "MixinClientConnection"
+    "MixinServerNetworkIoChInit"
   ],
   "client": [
     "client.MixinClientConnectionChInit",