fix: handle message delete success / error events

chat/src/main/java/com/github/twitch4j/chat/events/IRCEventHandler.java

@@ -10,6 +10,7 @@
 import com.github.twitch4j.common.events.domain.EventUser;
 import com.github.twitch4j.common.events.user.PrivateMessageEvent;
 import lombok.Getter;
+import lombok.extern.slf4j.Slf4j;
 
 import java.time.Month;
 import java.util.HashMap;
@@ -25,6 +26,7 @@
  * Listens for any irc triggered events and created the corresponding events for the EventDispatcher.
  */
 @Getter
+@Slf4j
 public class IRCEventHandler {
 
     /**
@@ -66,6 +68,7 @@ public IRCEventHandler(TwitchChat twitchChat) {
         eventManager.getEventHandler(SimpleEventHandler.class).onEvent(IRCMessageEvent.class, this::onUnraid);
         eventManager.getEventHandler(SimpleEventHandler.class).onEvent(IRCMessageEvent.class, this::onRewardGift);
         eventManager.getEventHandler(SimpleEventHandler.class).onEvent(IRCMessageEvent.class, this::onRitual);
+        eventManager.getEventHandler(SimpleEventHandler.class).onEvent(IRCMessageEvent.class, this::onMessageDeleteResponse);
     }
 
     /**
@@ -460,7 +463,7 @@ public void onNoticeEvent(IRCMessageEvent event) {
         if (event.getCommandType().equals("NOTICE")) {
             EventChannel channel = event.getChannel();
             String messageId = event.getTagValue("msg-id").get();
-            String message = event.getMessage().get();
+            String message = event.getMessage().orElse(null); // can be null, ie. bad_delete_message_error
 
             eventManager.publish(new ChannelNoticeEvent(channel, messageId, message));
         }
@@ -537,4 +540,18 @@ public void onChannelState(IRCMessageEvent event) {
             eventManager.publish(new ChannelStateEvent(channel, states));
         }
     }
+
+    public void onMessageDeleteResponse(IRCMessageEvent event) {
+        if (event.getCommandType().equals("NOTICE")) {
+            EventChannel channel = event.getChannel();
+            String messageId = event.getTagValue("msg-id").get();
+
+            if (messageId.equals("delete_message_success")) {
+                eventManager.publish(new MessageDeleteSuccess(channel));
+            } else if (messageId.equals("bad_delete_message_error")) {
+                eventManager.publish(new MessageDeleteError(channel));
+                log.warn("Failed to delete a message in {}!", channel.getName());
+            }
+        }
+    }
 }

chat/src/main/java/com/github/twitch4j/chat/events/channel/MessageDeleteError.java

@@ -0,0 +1,28 @@
+package com.github.twitch4j.chat.events.channel;
+
+import com.github.twitch4j.chat.events.AbstractChannelEvent;
+import com.github.twitch4j.common.events.domain.EventChannel;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+import lombok.Value;
+
+/**
+ * Failed to delete a message
+ */
+@Value
+@Getter
+@EqualsAndHashCode(callSuper = false)
+@ToString
+public class MessageDeleteError extends AbstractChannelEvent {
+
+    /**
+     * Event Constructor
+     *
+     * @param channel       The channel that this event originates from.
+     */
+    public MessageDeleteError(EventChannel channel) {
+        super(channel);
+    }
+
+}

chat/src/main/java/com/github/twitch4j/chat/events/channel/MessageDeleteSuccess.java

@@ -0,0 +1,28 @@
+package com.github.twitch4j.chat.events.channel;
+
+import com.github.twitch4j.chat.events.AbstractChannelEvent;
+import com.github.twitch4j.common.events.domain.EventChannel;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+import lombok.Value;
+
+/**
+ * Successfully deleted a message
+ */
+@Value
+@Getter
+@EqualsAndHashCode(callSuper = false)
+@ToString
+public class MessageDeleteSuccess extends AbstractChannelEvent {
+
+	/**
+	 * Event Constructor
+	 *
+	 * @param channel       The channel that this event originates from.
+	 */
+	public MessageDeleteSuccess(EventChannel channel) {
+		super(channel);
+	}
+
+}