add error handler and message deleter

d2m/actions/delete-message.js

@@ -0,0 +1,29 @@
+// @ts-check
+
+const passthrough = require("../../passthrough")
+const { sync, db } = passthrough
+/** @type {import("../converters/edit-to-changes")} */
+const editToChanges = sync.require("../converters/edit-to-changes")
+/** @type {import("../../matrix/api")} */
+const api = sync.require("../../matrix/api")
+
+/**
+ * @param {import("discord-api-types/v10").GatewayMessageDeleteDispatchData} data
+ */
+async function deleteMessage(data) {
+	/** @type {string?} */
+	const roomID = db.prepare("SELECT channel_id FROM channel_room WHERE channel_id = ?").pluck().get(data.channel_id)
+	if (!roomID) return
+
+	/** @type {string[]} */
+	const eventsToRedact = db.prepare("SELECT event_id FROM event_message WHERE message_id = ?").pluck().all(data.id)
+
+	for (const eventID of eventsToRedact) {
+		// Unfortuately, we can't specify a sender to do the redaction as, unless we find out that info via the audit logs
+		await api.redactEvent(roomID, eventID)
+		db.prepare("DELETE from event_message WHERE event_id = ?").run(eventID)
+		// TODO: Consider whether this code could be reused between edited messages and deleted messages.
+	}
+}
+
+module.exports.deleteMessage = deleteMessage

d2m/discord-packets.js

@@ -16,6 +16,7 @@ const utils = {
 		/** @type {typeof import("./event-dispatcher")} */
 		const eventDispatcher = sync.require("./event-dispatcher")
 
+		// Client internals, keep track of the state we need
 		if (message.t === "READY") {
 			if (client.ready) return
 			client.ready = true
@@ -62,16 +63,25 @@ const utils = {
 					}
 				}
 			}
+		}
 
+		// Event dispatcher for OOYE bridge operations
+		try {
+			if (message.t === "MESSAGE_CREATE") {
+				eventDispatcher.onMessageCreate(client, message.d)
 
-		} else if (message.t === "MESSAGE_CREATE") {
-			eventDispatcher.onMessageCreate(client, message.d)
+			} else if (message.t === "MESSAGE_UPDATE") {
+				eventDispatcher.onMessageUpdate(client, message.d)
 
-		} else if (message.t === "MESSAGE_UPDATE") {
-			eventDispatcher.onMessageUpdate(client, message.d)
+			} else if (message.t === "MESSAGE_DELETE") {
+				eventDispatcher.onMessageDelete(client, message.d)
 
-		} else if (message.t === "MESSAGE_REACTION_ADD") {
-			eventDispatcher.onReactionAdd(client, message.d)
+			} else if (message.t === "MESSAGE_REACTION_ADD") {
+				eventDispatcher.onReactionAdd(client, message.d)
+			}
+		} catch (e) {
+			// Let OOYE try to handle errors too
+			eventDispatcher.onError(client, e, message)
 		}
 	}
 }

d2m/event-dispatcher.js

@@ -1,17 +1,61 @@
 const assert = require("assert").strict
+const util = require("util")
 const {sync, db} = require("../passthrough")
 
 /** @type {import("./actions/send-message")}) */
 const sendMessage = sync.require("./actions/send-message")
 /** @type {import("./actions/edit-message")}) */
 const editMessage = sync.require("./actions/edit-message")
-
+/** @type {import("./actions/delete-message")}) */
+const deleteMessage = sync.require("./actions/delete-message")
 /** @type {import("./actions/add-reaction")}) */
 const addReaction = sync.require("./actions/add-reaction")
+/** @type {import("../matrix/api")}) */
+const api = sync.require("../matrix/api")
+
+let lastReportedEvent = 0
 
 // Grab Discord events we care about for the bridge, check them, and pass them on
 
 module.exports = {
+	/**
+	 * @param {import("./discord-client")} client
+	 * @param {Error} e
+	 * @param {import("cloudstorm").IGatewayMessage} gatewayMessage
+	 */
+	onError(client, e, gatewayMessage) {
+		console.error("hit event-dispatcher's error handler with this exception:")
+		console.error(e) // TODO: also log errors into a file or into the database, maybe use a library for this? or just wing it? definitely need to be able to store the formatted event body to load back in later
+		console.error(`while handling this ${gatewayMessage.t} gateway event:`)
+		console.dir(gatewayMessage.d)
+
+		if (Date.now() - lastReportedEvent > 5000) {
+			lastReportedEvent = Date.now()
+			const channelID = gatewayMessage.d.channel_id
+			if (channelID) {
+				const roomID = db.prepare("SELECT room_id FROM channel_room WHERE channel_id = ?").pluck().get(channelID)
+				let stackLines = e.stack.split("\n")
+				let cloudstormLine = stackLines.findIndex(l => l.includes("/node_modules/cloudstorm/"))
+				if (cloudstormLine !== -1) {
+					stackLines = stackLines.slice(0, cloudstormLine - 2)
+				}
+				api.sendEvent(roomID, "m.room.message", {
+					msgtype: "m.text",
+					body: "\u26a0 Bridged event from Discord not delivered. See formatted content for full details.",
+					format: "org.matrix.custom.html",
+					formatted_body: "\u26a0 <strong>Bridged event from Discord not delivered</strong>"
+						+ `<br>Gateway event: ${gatewayMessage.t}`
+						+ `<pre>${stackLines.join("\n")}</pre>`
+						+ `<details><summary>Original payload</summary>`
+						+ `<pre>${util.inspect(gatewayMessage.d, false, 4, false)}</pre></details>`,
+					"m.mentions": {
+						user_ids: ["@cadence:cadence.moe"]
+					}
+				})
+			}
+		}
+	},
+
 	/**
 	 * @param {import("./discord-client")} client
 	 * @param {import("discord-api-types/v10").GatewayMessageCreateDispatchData} message
@@ -38,7 +82,7 @@ module.exports = {
 	 */
 	onMessageUpdate(client, data) {
 		if (data.webhook_id) {
-			const row = db.prepare("SELECT webhook_id FROM webhook WHERE webhook_id = ?").pluck().get(message.webhook_id)
+			const row = db.prepare("SELECT webhook_id FROM webhook WHERE webhook_id = ?").pluck().get(data.webhook_id)
 			if (row) {
 				// The update was sent by the bridge's own webhook on discord. We don't want to reflect this back, so just drop it.
 				return
@@ -67,5 +111,14 @@ module.exports = {
 		if (data.emoji.id !== null) return // TODO: image emoji reactions
 		console.log(data)
 		addReaction.addReaction(data)
+	},
+
+	/**
+	 * @param {import("./discord-client")} client
+	 * @param {import("discord-api-types/v10").GatewayMessageDeleteDispatchData} data
+	 */
+	onMessageDelete(client, data) {
+		console.log(data)
+		deleteMessage.deleteMessage(data)
 	}
 }