index.ts
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	import { Hono } from 'hono';
	import { renderOgPng } from './og';
	import { asc, eq } from 'drizzle-orm';
	import { drizzle } from 'drizzle-orm/d1';
	import { renderBlank, renderReport } from './view';
	import { generate as generateShortUuid } from 'short-uuid';

	import {
	CrashReportSchema,
	frames as frameTable,
	reportFrames,
	reports,
	type CrashReport,
	} from './schema';

	type Bindings = { ASSETS: Fetcher; DB: D1Database };
	const app = new Hono<{ Bindings: Bindings }>();

	let antLogoDataUrl: Promise<string> \| null = null;
	let ogFontBytes: Promise<Uint8Array[]> \| null = null;

	app.get('/', c => c.html(renderBlank(), 404));

	async function reportTrace(report: CrashReport): Promise<string> {
	const traceInput = JSON.stringify({
	runtime: report.runtime,
	version: report.version,
	target: report.target,
	os: report.os,
	arch: report.arch,
	code: report.code,
	reason: report.reason,
	addr: report.addr,
	frames: report.frames,
	});

	return sha256(traceInput);
	}

	async function sha256(input: string): Promise<string> {
	const digest = await crypto.subtle.digest('SHA-256', new TextEncoder().encode(input));
	return [...new Uint8Array(digest)].map(byte => byte.toString(16).padStart(2, '0')).join('');
	}

	function publicUrl(requestUrl: string, id: string): string {
	const url = new URL(requestUrl);
	return `${url.origin}/${id}`;
	}

	function publicOgImageUrl(requestUrl: string, id: string): string {
	const url = new URL(requestUrl);
	return `${url.origin}/og/${id}.png`;
	}

	function bytesToBase64(bytes: Uint8Array): string {
	let binary = '';
	const chunkSize = 0x8000;
	for (let i = 0; i < bytes.length; i += chunkSize) {
	binary += String.fromCharCode(...bytes.subarray(i, i + chunkSize));
	}
	return btoa(binary);
	}

	async function loadAntLogoDataUrl(env: Bindings, requestUrl: string): Promise<string> {
	const response = await env.ASSETS.fetch(new Request(new URL('/assets/ant.png', requestUrl)));
	if (!response.ok) return '';
	const bytes = new Uint8Array(await response.arrayBuffer());
	return `data:image/png;base64,${bytesToBase64(bytes)}`;
	}

	async function loadAssetBytes(
	env: Bindings,
	requestUrl: string,
	path: string,
	): Promise<Uint8Array> {
	const response = await env.ASSETS.fetch(new Request(new URL(path, requestUrl)));
	if (!response.ok) return new Uint8Array();
	return new Uint8Array(await response.arrayBuffer());
	}

	function getAntLogoDataUrl(env: Bindings, requestUrl: string): Promise<string> {
	antLogoDataUrl ??= loadAntLogoDataUrl(env, requestUrl);
	return antLogoDataUrl;
	}

	function ogImageId(value: string): string {
	return value.endsWith('.png') ? value.slice(0, -4) : value;
	}

	function getOgFontBytes(env: Bindings, requestUrl: string): Promise<Uint8Array[]> {
	ogFontBytes ??= Promise.all([
	loadAssetBytes(env, requestUrl, '/assets/Arial.ttf'),
	loadAssetBytes(env, requestUrl, '/assets/Arial-Bold.ttf'),
	loadAssetBytes(env, requestUrl, '/assets/BerkeleyMono-Regular.woff2'),
	]);
	return ogFontBytes;
	}

	const reportFromRows = (
	row: typeof reports.$inferSelect,
	frameRows: { frame: string }[],
	): CrashReport => ({
	schema: 1,
	runtime: 'ant',
	version: row.version,
	target: row.target,
	os: row.os,
	arch: row.arch,
	kind: row.kind,
	code: row.code,
	reason: row.reason,
	addr: row.faultAddress,
	elapsedMs: row.elapsedMs,
	peakRss: row.peakRss,
	frames: frameRows.map(row => row.frame),
	});

	async function insertReportFrames(
	db: ReturnType<typeof drizzle>,
	reportId: string,
	frames: string[],
	): Promise<void> {
	if (!frames.length) return;
	const frameHashes = await Promise.all(frames.map(frame => sha256(frame)));
	const uniqueFrames = new Map<string, string>();

	frames.forEach((frame, index) => {
	uniqueFrames.set(frameHashes[index], frame);
	});

	await db
	.insert(frameTable)
	.values([...uniqueFrames].map(([hash, frame]) => ({ hash, frame })))
	.onConflictDoNothing();

	await db.insert(reportFrames).values(
	frameHashes.map((frameHash, index) => ({
	frameHash,
	reportId,
	frameIndex: index,
	})),
	);
	}

	async function getReportFrames(
	db: ReturnType<typeof drizzle>,
	reportId: string,
	): Promise<{ frame: string }[]> {
	return db
	.select({
	frame: frameTable.frame,
	})
	.from(reportFrames)
	.innerJoin(frameTable, eq(reportFrames.frameHash, frameTable.hash))
	.where(eq(reportFrames.reportId, reportId))
	.orderBy(asc(reportFrames.frameIndex));
	}

	async function getReport(db: ReturnType<typeof drizzle>, id: string): Promise<CrashReport \| null> {
	const [row] = await db.select().from(reports).where(eq(reports.id, id)).limit(1);

	if (!row) return null;
	const frames = await getReportFrames(db, row.id);
	return reportFromRows(row, frames);
	}

	app.get('/og/:image', async c => {
	const db = drizzle(c.env.DB);
	const id = ogImageId(c.req.param('image'));

	const cache = caches.default;
	const cacheKey = new Request(publicOgImageUrl(c.req.url, id), { method: 'GET' });

	const cached = await cache.match(cacheKey);
	if (cached) return cached;

	const report = await getReport(db, id);
	if (!report) return c.notFound();

	const png = await renderOgPng(
	report,
	await getAntLogoDataUrl(c.env, c.req.url),
	await getOgFontBytes(c.env, c.req.url),
	);

	const response = c.body(png, 200, {
	'Content-Type': 'image/png',
	'Cache-Control': 'public, max-age=2592000, immutable',
	});

	c.executionCtx.waitUntil(cache.put(cacheKey, response.clone()));
	return response;
	});

	app.get('/:id', async c => {
	const db = drizzle(c.env.DB);
	const id = c.req.param('id');
	const report = await getReport(db, id);

	if (!report) return c.html(renderBlank(), 404);
	return c.html(renderReport(report, publicUrl(c.req.url, id), publicOgImageUrl(c.req.url, id)));
	});

	app.post('/report', async c => {
	let rawReport: unknown;
	try {
	rawReport = await c.req.json();
	} catch {
	return c.json({ error: 'invalid payload' }, 400);
	}

	const parsedReport = CrashReportSchema.safeParse(rawReport);
	if (!parsedReport.success) return c.json({ error: 'invalid report' }, 400);

	const report = parsedReport.data;
	const trace = await reportTrace(report);

	const db = drizzle(c.env.DB);
	const id = generateShortUuid();

	const now = new Date();
	const expires = new Date(now.getTime() + 30 * 24 * 60 * 60 * 1000);

	await db.insert(reports).values({
	id,
	trace,
	hitCount: 1,
	runtime: report.runtime,
	version: report.version,
	kind: report.kind,
	reason: report.reason,
	code: report.code,
	target: report.target,
	os: report.os,
	arch: report.arch,
	faultAddress: report.addr,
	elapsedMs: report.elapsedMs,
	peakRss: report.peakRss,
	firstSeenAt: now.toISOString(),
	lastSeenAt: now.toISOString(),
	expiresAt: expires.toISOString(),
	});

	await insertReportFrames(db, id, report.frames);
	return c.text(publicUrl(c.req.url, id), 200);
	});

	export default app;

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