added MESSAGE_DELETE_BULK

src/Discord.Net/API/Gateway/MessageDeleteBulkEvent.cs

@@ -0,0 +1,13 @@
+using Newtonsoft.Json;
+using System.Collections.Generic;
+
+namespace Discord.API.Gateway
+{
+    public class MessageDeleteBulkEvent
+    {
+        [JsonProperty("channel_id")]
+        public ulong ChannelId { get; set; }
+        [JsonProperty("ids")]
+        public IEnumerable<ulong> Ids { get; set; }
+    }
+}

src/Discord.Net/DiscordSocketClient.cs

@@ -805,6 +805,27 @@ namespace Discord
                                     }
                                 }
                                 break;
+                            case "MESSAGE_DELETE_BULK":
+                                {
+                                    await _gatewayLogger.DebugAsync("Received Dispatch (MESSAGE_DELETE_BULK)").ConfigureAwait(false);
+
+                                    var data = (payload as JToken).ToObject<MessageDeleteBulkEvent>(_serializer);
+                                    var channel = DataStore.GetChannel(data.ChannelId) as ICachedMessageChannel;
+                                    if (channel != null)
+                                    {
+                                        foreach (var id in data.Ids)
+                                        {
+                                            var msg = channel.RemoveMessage(id);
+                                            await MessageDeleted.RaiseAsync(msg).ConfigureAwait(false);
+                                        }
+                                    }
+                                    else
+                                    {
+                                        await _gatewayLogger.WarningAsync("MESSAGE_DELETE_BULK referenced an unknown channel.").ConfigureAwait(false);
+                                        return;
+                                    }
+                                }
+                                break;
 
                             //Statuses
                             case "PRESENCE_UPDATE":