Make custom errors by extending Error

Author: John Schulz

x-pack/plugins/ingest_manager/server/errors.ts

@@ -4,26 +4,20 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
+/* eslint-disable max-classes-per-file */
 export class IngestManagerError extends Error {
-  public type: IngestManagerErrorType;
-  public message: string;
-
-  constructor(type: IngestManagerErrorType, message: string) {
+  constructor(message?: string) {
     super(message);
-    this.type = type;
-    this.message = message;
+    this.name = this.constructor.name; // for stack traces
   }
 }
 
 export const getHTTPResponseCode = (error: IngestManagerError): number => {
-  switch (error.type) {
-    case IngestManagerErrorType.RegistryError:
-      return 502; // Bad Gateway
-    default:
-      return 400; // Bad Request
+  if (error instanceof RegistryError) {
+    return 502; // Bad Gateway
+  } else {
+    return 400; // Bad Request
   }
 };
 
-export enum IngestManagerErrorType {
-  RegistryError,
-}
+export class RegistryError extends IngestManagerError {}

x-pack/plugins/ingest_manager/server/services/epm/registry/requests.ts

@@ -6,24 +6,20 @@
 
 import fetch, { Response } from 'node-fetch';
 import { streamToString } from './streams';
-import { IngestManagerError, IngestManagerErrorType } from '../../../errors';
+import { RegistryError } from '../../../errors';
 
 export async function getResponse(url: string): Promise<Response> {
   try {
     const response = await fetch(url);
     if (response.ok) {
       return response;
     } else {
-      throw new IngestManagerError(
-        IngestManagerErrorType.RegistryError,
+      throw new RegistryError(
         `Error connecting to package registry at ${url}: ${response.statusText}`
       );
     }
   } catch (e) {
-    throw new IngestManagerError(
-      IngestManagerErrorType.RegistryError,
-      `Error connecting to package registry at ${url}: ${e.message}`
-    );
+    throw new RegistryError(`Error connecting to package registry at ${url}: ${e.message}`);
   }
 }