attempt to support THREAD_CREATE but it explodes

d2m/converters/message-to-event.js

@@ -27,11 +27,13 @@ function getDiscordParseCallbacks(message, useHTML) {
 		},
 		/** @param {{id: string, type: "discordChannel"}} node */
 		channel: node => {
-			const {room_id, name, nick} = db.prepare("SELECT room_id, name, nick FROM channel_room WHERE channel_id = ?").get(node.id)
-			if (room_id && useHTML) {
-				return `<a href="https://matrix.to/#/${room_id}">#${nick || name}</a>`
+			const row = db.prepare("SELECT room_id, name, nick FROM channel_room WHERE channel_id = ?").get(node.id)
+			if (!row) {
+				return `<#${node.id}>` // fallback for when this channel is not bridged
+			} else if (useHTML) {
+				return `<a href="https://matrix.to/#/${row.room_id}">#${row.nick || row.name}</a>`
 			} else {
-				return `#${nick || name}`
+				return `#${row.nick || row.name}`
 			}
 		},
 		/** @param {{animated: boolean, name: string, id: string, type: "discordEmoji"}} node */

d2m/discord-packets.js

@@ -44,6 +44,10 @@ const utils = {
 			eventDispatcher.checkMissedMessages(client, message.d)
 
 
+		} else if (message.t === "THREAD_CREATE") {
+			client.channels.set(message.d.id, message.d)
+
+
 		} else if (message.t === "CHANNEL_UPDATE" || message.t === "THREAD_UPDATE") {
 			client.channels.set(message.d.id, message.d)
 
@@ -81,13 +85,19 @@ const utils = {
 			if (message.t === "CHANNEL_UPDATE") {
 				await eventDispatcher.onChannelOrThreadUpdate(client, message.d, false)
 
+			} else if (message.t === "THREAD_CREATE") {
+				console.log(message)
+				// await eventDispatcher.onThreadCreate(client, message.d)
+
 			} else if (message.t === "THREAD_UPDATE") {
 				await eventDispatcher.onChannelOrThreadUpdate(client, message.d, true)
 
 			} else if (message.t === "MESSAGE_CREATE") {
+				console.log(message)
 				await eventDispatcher.onMessageCreate(client, message.d)
 
 			} else if (message.t === "MESSAGE_UPDATE") {
+				console.log(message)
 				await eventDispatcher.onMessageUpdate(client, message.d)
 
 			} else if (message.t === "MESSAGE_DELETE") {

d2m/event-dispatcher.js

@@ -101,7 +101,18 @@ module.exports = {
 		}
 	},
 
-		/**
+	/**
+	 * @param {import("./discord-client")} client
+	 * @param {import("discord-api-types/v10").APIChannel} thread
+	 */
+	async onThreadCreate(client, thread) {
+		console.log(thread)
+		const parentRoomID = db.prepare("SELECT room_id FROM channel_room WHERE channel_id = ?").get(thread.parent_id)
+		if (!parentRoomID) return // Not interested in a thread if we aren't interested in its wider channel
+		await createRoom.syncRoom(thread.id)
+	},
+
+	/**
 	 * @param {import("./discord-client")} client
 	 * @param {import("discord-api-types/v10").GatewayChannelUpdateDispatchData} channelOrThread
 	 * @param {boolean} isThread

notes.md

@@ -9,6 +9,16 @@ A database will be used to store the discord id to matrix event id mapping. Tabl
 
 There needs to be a way to easily manually trigger something later. For example, it should be easy to manually retry sending a message, or check all members for changes, etc.
 
+## Discord's gateway when a new thread is created from an existing message:
+
+1. Regular MESSAGE_CREATE of the message that it's going to branch off in the future. Example ID -6423
+2. It MESSAGE_UPDATEd the ID -6423 with this whole data: {id:-6423,flags: 32,channel_id:-2084,guild_id:-1727} (ID is the message ID it's branching off, channel ID is the parent channel containing the message ID it's branching off)
+3. It THREAD_CREATEd and gave us a channel object with type 11 (public thread) and parent ID -2084 and ID -6423.
+4. It MESSAGE_CREATEd type 21 with blank content and a message reference pointing towards channel -2084 message -6423. (That's the message it branched from in the parent channel.) This MESSAGE_CREATE got ID -4631 (a new ID). Apart from that it's a regular message object.
+5. Finally, as the first "real" message in that thread (which a user must send to create that thread!) it sent a regular message object with a new message ID and a channel ID of -6423.
+
+When viewing this thread, it shows the message branched from at the top, and then the first "real" message right underneath, as separate groups.
+
 ## Current manual process for setting up a server
 
 1. Call createSpace.createSpace(discord.guilds.get(GUILD_ID))