From d54e91c6582ed160cf2f2fcf977e48b4439d133b Mon Sep 17 00:00:00 2001
From: Elizabeth Alexander Hunt <me@liz.coffee>
Date: Sun, 18 May 2025 22:54:15 -0700
Subject: snapshot

---
 u/server/filter/mod.ts | 28 ++++++++++++++++++++++------
 1 file changed, 22 insertions(+), 6 deletions(-)

(limited to 'u/server/filter/mod.ts')

diff --git a/u/server/filter/mod.ts b/u/server/filter/mod.ts
index 22ddad5..bbf37df 100644
--- a/u/server/filter/mod.ts
+++ b/u/server/filter/mod.ts
@@ -1,13 +1,29 @@
-import type {
-  IEither,
-  ITraceable,
-  PenguenoRequest,
-  ServerTrace,
+import {
+  type IEither,
+  type ITraceable,
+  LogLevel,
+  type PenguenoRequest,
+  type ServerTrace,
 } from "@emprespresso/pengueno";
 
+export enum ErrorSource {
+  USER = LogLevel.WARN,
+  SYSTEM = LogLevel.ERROR,
+}
+
+export class PenguenoError extends Error {
+  public readonly source: ErrorSource;
+  constructor(message: string, public readonly status: number) {
+    super(message);
+    this.source = Math.floor(status / 100) === 4
+      ? ErrorSource.USER
+      : ErrorSource.SYSTEM;
+  }
+}
+
 export interface RequestFilter<
   T,
-  Err,
+  Err extends PenguenoError = PenguenoError,
   RIn = ITraceable<PenguenoRequest, ServerTrace>,
 > {
   (req: RIn): Promise<IEither<Err, T>>;
-- 
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