Initial commit

src/server/stats-handlers.ts

@@ -0,0 +1,37 @@
+import type { IncomingMessage, ServerResponse } from "node:http";
+import {
+  readRecords,
+  summarizeTokenUsage,
+  type TokenStatsQuery,
+} from "../stats/token-store.js";
+
+function json(res: ServerResponse, status: number, data: unknown): void {
+  res.writeHead(status, { "Content-Type": "application/json; charset=utf-8" });
+  res.end(JSON.stringify(data));
+}
+
+export async function handleStatsApi(
+  _req: IncomingMessage,
+  res: ServerResponse,
+  pathname: string,
+  searchParams: URLSearchParams,
+): Promise<boolean> {
+  if (pathname !== "/api/stats/tokens") return false;
+
+  const query: TokenStatsQuery = {
+    bookId: searchParams.get("bookId") ?? undefined,
+    orchestratorId: searchParams.get("orchestratorId") ?? undefined,
+    sessionId: searchParams.get("sessionId") ?? undefined,
+    from: searchParams.get("from") ?? undefined,
+    to: searchParams.get("to") ?? undefined,
+    limit: searchParams.get("limit")
+      ? Number(searchParams.get("limit"))
+      : undefined,
+  };
+
+  json(res, 200, {
+    summary: summarizeTokenUsage(query),
+    records: readRecords({ ...query, limit: query.limit ?? 100 }),
+  });
+  return true;
+}