From d51c9d74857aca3c2f172609297266968bc7f809 Mon Sep 17 00:00:00 2001
From: Elizabeth Alexander Hunt <me@liz.coffee>
Date: Mon, 12 May 2025 09:40:12 -0700
Subject: The big refactor TM

---
 u/server/response.ts | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 u/server/response.ts

(limited to 'u/server/response.ts')

diff --git a/u/server/response.ts b/u/server/response.ts
new file mode 100644
index 0000000..c21819a
--- /dev/null
+++ b/u/server/response.ts
@@ -0,0 +1,84 @@
+import {
+  type IEither,
+  isEither,
+  type ITraceable,
+  Metric,
+  type PenguenoRequest,
+  type ServerTrace,
+} from "@emprespresso/pengueno";
+
+export type ResponseBody = object | string;
+export type TResponseInit = ResponseInit & {
+  status: number;
+  headers?: Record<string, string>;
+};
+
+const getResponse = (
+  req: PenguenoRequest,
+  opts: TResponseInit,
+): TResponseInit => {
+  return {
+    ...opts,
+    headers: {
+      ...(req.baseResponseHeaders()),
+      ...(opts?.headers),
+      "Content-Type": (opts?.headers?.["Content-Type"] ?? "text/plain") +
+        "; charset=utf-8",
+    },
+  };
+};
+
+const ResponseCodeMetrics = [1, 2, 3, 4, 5].map((x) =>
+  Metric.fromName(`response.${x}xx`)
+);
+export const getResponseMetric = (status: number) => {
+  const index = (Math.floor(status / 100)) + 1;
+  return ResponseCodeMetrics[index] ?? ResponseCodeMetrics[5 - 1];
+};
+
+export class PenguenoResponse extends Response {
+  constructor(
+    req: ITraceable<PenguenoRequest, ServerTrace>,
+    msg: BodyInit,
+    opts: TResponseInit,
+  ) {
+    const responseOpts = getResponse(req.get(), opts);
+    const resMetric = getResponseMetric(opts.status);
+    req.trace.trace(resMetric.count.withValue(1.0));
+    responseOpts.headers;
+    super(msg, responseOpts);
+  }
+}
+
+export class JsonResponse extends PenguenoResponse {
+  constructor(
+    req: ITraceable<PenguenoRequest, ServerTrace>,
+    e: BodyInit | IEither<ResponseBody, ResponseBody>,
+    opts: TResponseInit,
+  ) {
+    const optsWithJsonContentType = {
+      ...opts,
+      headers: {
+        ...opts?.headers,
+        "Content-Type": "application/json",
+      },
+    };
+    if (isEither<ResponseBody, ResponseBody>(e)) {
+      super(
+        req,
+        JSON.stringify(
+          e.fold((err, ok) => err ? ({ error: err! }) : ({ ok: ok! })),
+        ),
+        optsWithJsonContentType,
+      );
+      return;
+    }
+    super(
+      req,
+      JSON.stringify(
+        (Math.floor(opts.status / 100) < 4) ? { ok: e } : { error: e },
+      ),
+      optsWithJsonContentType,
+    );
+  }
+}
-- 
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