refactor: remove Node.js fallback from stats-server, use Bun only

src/core/services/stats-server.ts

@@ -1,6 +1,5 @@
 import { Hono } from 'hono';
 import type { ImmersionTrackerService } from './immersion-tracker-service.js';
-import { createServer, type IncomingMessage, type ServerResponse } from 'node:http';
 import { basename, extname, resolve, sep } from 'node:path';
 import { readFileSync, existsSync, statSync } from 'node:fs';
 import { MediaGenerator } from '../../media-generator.js';
@@ -156,26 +155,6 @@ export interface StatsServerConfig {
   resolveAnkiNoteId?: (noteId: number) => number;
 }
 
-type StatsServerHandle = {
-  stop: () => void;
-};
-
-type StatsApp = ReturnType<typeof createStatsApp>;
-
-type BunRuntime = {
-  Bun: {
-    serve: (options: {
-      fetch: StatsApp['fetch'];
-      port: number;
-      hostname: string;
-    }) => StatsServerHandle;
-  };
-};
-
-type NodeRuntimeHandle = {
-  stop: () => void;
-};
-
 const STATS_STATIC_CONTENT_TYPES: Record<string, string> = {
   '.css': 'text/css; charset=utf-8',
   '.gif': 'image/gif',
@@ -248,82 +227,6 @@ function createStatsStaticResponse(staticDir: string, requestPath: string): Resp
   });
 }
 
-async function readNodeRequestBody(req: IncomingMessage): Promise<Buffer> {
-  const chunks: Buffer[] = [];
-  for await (const chunk of req) {
-    chunks.push(typeof chunk === 'string' ? Buffer.from(chunk) : Buffer.from(chunk));
-  }
-  return Buffer.concat(chunks);
-}
-
-async function createNodeRequest(req: IncomingMessage): Promise<Request> {
-  const host = req.headers.host ?? '127.0.0.1';
-  const url = new URL(req.url ?? '/', `http://${host}`);
-  const headers = new Headers();
-  for (const [name, value] of Object.entries(req.headers)) {
-    if (value === undefined) continue;
-    if (Array.isArray(value)) {
-      headers.set(name, value.join(', '));
-    } else {
-      headers.set(name, value);
-    }
-  }
-
-  const method = req.method ?? 'GET';
-  const body = method === 'GET' || method === 'HEAD' ? undefined : await readNodeRequestBody(req);
-  const init: RequestInit = {
-    method,
-    headers,
-  };
-  if (body !== undefined && body.length > 0) {
-    init.body = new Uint8Array(body);
-  }
-  return new Request(url, init);
-}
-
-async function writeNodeResponse(
-  res: ServerResponse<IncomingMessage>,
-  response: Response,
-): Promise<void> {
-  res.statusCode = response.status;
-  res.statusMessage = response.statusText;
-  response.headers.forEach((value, key) => {
-    res.setHeader(key, value);
-  });
-
-  if (!response.body) {
-    res.end();
-    return;
-  }
-
-  const body = Buffer.from(await response.arrayBuffer());
-  res.end(body);
-}
-
-function startNodeStatsServer(app: StatsApp, port: number): NodeRuntimeHandle {
-  const server = createServer((req, res) => {
-    void (async () => {
-      try {
-        const response = await app.fetch(await createNodeRequest(req));
-        await writeNodeResponse(res, response);
-      } catch {
-        if (!res.headersSent) {
-          res.statusCode = 500;
-        }
-        res.end('Internal Server Error');
-      }
-    })();
-  });
-
-  server.listen(port, '127.0.0.1');
-
-  return {
-    stop: () => {
-      server.close();
-    },
-  };
-}
-
 export function createStatsApp(
   tracker: ImmersionTrackerService,
   options?: {
@@ -1103,14 +1006,23 @@ export function startStatsServer(config: StatsServerConfig): { close: () => void
     resolveAnkiNoteId: config.resolveAnkiNoteId,
   });
 
-  const bunServe = (globalThis as typeof globalThis & Partial<BunRuntime>).Bun?.serve;
-  const server = bunServe
-    ? bunServe({
-        fetch: app.fetch,
-        port: config.port,
-        hostname: '127.0.0.1',
-      })
-    : startNodeStatsServer(app, config.port);
+  const bunServe = (
+    globalThis as typeof globalThis & {
+      Bun: {
+        serve: (options: {
+          fetch: (typeof app)['fetch'];
+          port: number;
+          hostname: string;
+        }) => { stop: () => void };
+      };
+    }
+  ).Bun.serve;
+
+  const server = bunServe({
+    fetch: app.fetch,
+    port: config.port,
+    hostname: '127.0.0.1',
+  });
 
   return {
     close: () => {