snapshot of https://github.com/tldraw/tldraw.git (main, 2026-09-23; blobs > 131072B omitted)

internal/health-worker/src/index.ts

@@ -0,0 +1,69 @@
+import { DiscordPayload, updownToDiscord } from './discord'
+import { Event as UpdownEvent } from './updown_types'
+
+interface Env {
+	DISCORD_HEALTH_WEBHOOK_URL: string | undefined
+	// it needs to be passed in because it's effectively a secret, unless we want everyone to be able
+	// to stress us out with spurious discord alerts
+	HEALTH_WORKER_UPDOWN_WEBHOOK_PATH: string | undefined
+}
+
+async function sendDiscordWebhook(url: string, discord: DiscordPayload): Promise<Response> {
+	return fetch(url, {
+		method: 'POST',
+		headers: {
+			'Content-Type': 'application/json',
+		},
+		body: JSON.stringify(discord),
+	})
+}
+
+async function handleUpdown(request: Request, discordUrl: string): Promise<Response> {
+	const updownEvents = (await request.json()) as Array<UpdownEvent>
+
+	let status = 200
+	for (const e of updownEvents) {
+		const discordPayload = updownToDiscord(e)
+		if (!discordPayload) {
+			continue
+		}
+		const discordResult = await sendDiscordWebhook(discordUrl, discordPayload)
+
+		if (!discordResult.ok) {
+			console.error(`Discord error ${discordResult.status}: ${discordResult.statusText}`)
+			status = discordResult.status
+			break
+		}
+	}
+
+	return new Response(null, { status })
+}
+
+const handler: ExportedHandler<Env> = {
+	async fetch(request: Request, env: Env): Promise<Response> {
+		const discordUrl = env.DISCORD_HEALTH_WEBHOOK_URL
+		if (!discordUrl) {
+			console.error('missing DISCORD_HEALTH_WEBHOOK_URL')
+			return new Response('Internal error', { status: 500 })
+		}
+
+		const updownWebhookPath = env.HEALTH_WORKER_UPDOWN_WEBHOOK_PATH
+		if (!updownWebhookPath) {
+			console.error('missing HEALTH_WORKER_UPDOWN_WEBHOOK_PATH')
+			return new Response('Internal error', { status: 500 })
+		}
+
+		const url = new URL(request.url)
+
+		// timing safety COULD be an issue, but it seems that in practice it isn't:
+		// https://github.com/scriptin/node-timing-attack
+		// my own testing confirms those observations
+		if (url.pathname === updownWebhookPath) {
+			return handleUpdown(request, discordUrl)
+		}
+
+		return new Response('Not Found', { status: 404 })
+	},
+}
+
+export default handler