Add PacketErrorEvent, allowing packet I/O exceptions to be ignored.

src/main/java/com/github/steveice10/packetlib/event/session/PacketErrorEvent.java

@@ -0,0 +1,68 @@
+package com.github.steveice10.packetlib.event.session;
+
+import com.github.steveice10.packetlib.Session;
+
+/**
+ * Called when a session encounters an error while reading or writing packet data.
+ */
+public class PacketErrorEvent implements SessionEvent {
+    private Session session;
+    private Throwable cause;
+    private boolean suppress = false;
+
+    /**
+     * Creates a new SessionErrorEvent instance.
+     *
+     * @param session Session that the error came from.
+     * @param cause   Cause of the error.
+     */
+    public PacketErrorEvent(Session session, Throwable cause) {
+        this.session = session;
+        this.cause = cause;
+    }
+
+    /**
+     * Gets the session involved in this event.
+     *
+     * @return The event's session.
+     */
+    public Session getSession() {
+        return this.session;
+    }
+
+    /**
+     * Gets the Throwable responsible for the error.
+     *
+     * @return The Throwable responsible for the error.
+     */
+    public Throwable getCause() {
+        return this.cause;
+    }
+
+    /**
+     * Gets whether the error should be suppressed. If the error is not suppressed,
+     * it will be passed on through internal error handling and disconnect the session.
+     *
+     * The default value is false.
+     *
+     * @return Whether the error should be suppressed.
+     */
+    public boolean shouldSuppress() {
+        return this.suppress;
+    }
+
+    /**
+     * Sets whether the error should be suppressed. If the error is not suppressed,
+     * it will be passed on through internal error handling and disconnect the session.
+     *
+     * @param suppress Whether the error should be suppressed.
+     */
+    public void setSuppress(boolean suppress) {
+        this.suppress = suppress;
+    }
+
+    @Override
+    public void call(SessionListener listener) {
+        listener.packetError(this);
+    }
+}

src/main/java/com/github/steveice10/packetlib/event/session/SessionAdapter.java

@@ -16,6 +16,10 @@ public class SessionAdapter implements SessionListener {
     public void packetSent(PacketSentEvent event) {
     }
 
+    @Override
+    public void packetError(PacketErrorEvent event) {
+    }
+
     @Override
     public void connected(ConnectedEvent event) {
     }

src/main/java/com/github/steveice10/packetlib/event/session/SessionListener.java

@@ -25,6 +25,13 @@ public interface SessionListener {
      */
     public void packetSent(PacketSentEvent event);
 
+    /**
+     * Called when a session encounters an error while reading or writing packet data.
+     *
+     * @param event Data relating to the event.
+     */
+    public void packetError(PacketErrorEvent event);
+
     /**
      * Called when a session connects.
      *

src/main/java/com/github/steveice10/packetlib/tcp/TcpPacketCodec.java

@@ -1,6 +1,7 @@
 package com.github.steveice10.packetlib.tcp;
 
 import com.github.steveice10.packetlib.Session;
+import com.github.steveice10.packetlib.event.session.PacketErrorEvent;
 import com.github.steveice10.packetlib.event.session.PacketReceivedEvent;
 import com.github.steveice10.packetlib.io.NetInput;
 import com.github.steveice10.packetlib.io.NetOutput;
@@ -23,8 +24,16 @@ public class TcpPacketCodec extends ByteToMessageCodec<Packet> {
     @Override
     public void encode(ChannelHandlerContext ctx, Packet packet, ByteBuf buf) throws Exception {
         NetOutput out = new ByteBufNetOutput(buf);
-        this.session.getPacketProtocol().getPacketHeader().writePacketId(out, this.session.getPacketProtocol().getOutgoingId(packet));
-        packet.write(out);
+        try {
+            this.session.getPacketProtocol().getPacketHeader().writePacketId(out, this.session.getPacketProtocol().getOutgoingId(packet));
+            packet.write(out);
+        } catch(Throwable t) {
+            PacketErrorEvent e = new PacketErrorEvent(this.session, t);
+            this.session.callEvent(e);
+            if(!e.shouldSuppress()) {
+                throw t;
+            }
+        }
     }
 
     @Override
@@ -37,8 +46,19 @@ public class TcpPacketCodec extends ByteToMessageCodec<Packet> {
             return;
         }
 
-        Packet packet = this.session.getPacketProtocol().createIncomingPacket(id);
-        packet.read(in);
+        Packet packet;
+        try {
+            packet = this.session.getPacketProtocol().createIncomingPacket(id);
+            packet.read(in);
+        } catch(Throwable t) {
+            PacketErrorEvent e = new PacketErrorEvent(this.session, t);
+            this.session.callEvent(e);
+            if(!e.shouldSuppress()) {
+                throw t;
+            }
+
+            return;
+        }
 
         if(buf.readableBytes() > 0) {
             throw new IllegalStateException("Packet \"" + packet.getClass().getSimpleName() + "\" not fully read.");