1 files changed, 22 insertions, 6 deletions
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>>;