Unwrap error message when getting projects in Jenkins plugin

Signed-off-by: Tim Jacomb <timjacomb1@gmail.com>

plugins/jenkins-backend/src/service/jenkinsApi.ts

@@ -100,7 +100,7 @@ export class JenkinsApiImpl {
         // Filter only be the information we need, instead of loading all fields.
         // Limit to only show the latest build for each job and only load 50 jobs
         // at all.
-        // Whitespaces are only included for readablity here and stripped out
+        // Whitespaces are only included for readability here and stripped out
         // before sending to Jenkins
         tree: JenkinsApiImpl.jobsTreeSpec.replace(/\s/g, ''),
       });

plugins/jenkins-backend/src/service/router.ts

@@ -27,6 +27,7 @@ import {
 } from '@backstage/plugin-permission-common';
 import { getBearerTokenFromAuthorizationHeader } from '@backstage/plugin-auth-node';
 import { stringifyEntityRef } from '@backstage/catalog-model';
+import { stringifyError } from "@backstage/errors";
 
 /** @public */
 export interface RouterOptions {
@@ -90,11 +91,22 @@ export async function createRouter(
         },
         backstageToken: token,
       });
-      const projects = await jenkinsApi.getProjects(jenkinsInfo, branches);
 
-      response.json({
-        projects: projects,
-      });
+
+      try {
+        const projects = await jenkinsApi.getProjects(jenkinsInfo, branches);
+
+        response.json({
+          projects: projects,
+        });
+      } catch (err) {
+        // Promise.any, used in the getProjects call returns an Aggregate error message with a useless error message 'AggregateError: All promises were rejected'
+        // extract useful information ourselves
+        if (err.errors) {
+          throw new Error(`Unable to fetch projects, for ${jenkinsInfo.jobFullName}: ${stringifyError(err.errors)}`)
+        }
+        throw err
+      }
     },
   );