Improve /crates route error handling

app/routes/crates.js

@@ -2,14 +2,21 @@ import Route from '@ember/routing/route';
 import { inject as service } from '@ember/service';
 
 export default class CratesRoute extends Route {
+  @service router;
   @service store;
 
   queryParams = {
     page: { refreshModel: true },
     sort: { refreshModel: true },
   };
 
-  model(params) {
-    return this.store.query('crate', params);
+  async model(params, transition) {
+    try {
+      return await this.store.query('crate', params);
+    } catch (error) {
+      let title = `Failed to load crate list`;
+      let details = error.errors?.[0]?.detail;
+      return this.router.replaceWith('catch-all', { transition, error, title, details, tryAgain: true });
+    }
   }
 }

app/templates/catch-all.hbs

@@ -4,6 +4,10 @@
 
     <h1 local-class="title" data-test-title>{{or @model.title "Page not found"}}</h1>
 
+    {{#if @model.details}}
+      <p local-class="details" data-test-details>{{@model.details}}</p>
+    {{/if}}
+
     {{#if @model.loginNeeded}}
       <button
         type="button"

e2e/acceptance/crates.spec.ts

@@ -1,5 +1,6 @@
 import { expect, test } from '@/e2e/helper';
 import { loadFixtures } from '@crates-io/msw/fixtures';
+import { http, HttpResponse } from 'msw';
 
 test.describe('Acceptance | crates page', { tag: '@acceptance' }, () => {
   // should match the default set in the crates controller
@@ -79,4 +80,25 @@ test.describe('Acceptance | crates page', { tag: '@acceptance' }, () => {
     await page.goto('/crates');
     await expect(page.locator('[data-test-crate-row="0"] [data-test-recent-downloads]')).toHaveText('Recent: 2,000');
   });
+
+  test('shows error message screen', async ({ page, msw }) => {
+    loadFixtures(msw.db);
+
+    let detail =
+      'Page 1 is unavailable for performance reasons. Please take a look at https://crates.io/data-access for alternatives.';
+    let error = HttpResponse.json({ errors: [{ detail }] }, { status: 400 });
+    await msw.worker.use(http.get('/api/v1/crates', () => error));
+
+    await page.goto('/crates');
+    await expect(page.locator('[data-test-404-page]')).toBeVisible();
+    await expect(page.locator('[data-test-title]')).toHaveText('Failed to load crate list');
+    await expect(page.locator('[data-test-details]')).toHaveText(detail);
+    await expect(page.locator('[data-test-try-again]')).toBeVisible();
+    await expect(page.locator('[data-test-go-back]')).not.toBeVisible();
+
+    await msw.worker.resetHandlers();
+    await page.click('[data-test-try-again]');
+    await expect(page.locator('[data-test-404-page]')).not.toBeVisible();
+    await expect(page.locator('[data-test-crate-row]')).toHaveCount(23);
+  });
 });

tests/acceptance/crates-test.js

@@ -1,14 +1,16 @@
-import { click, currentURL, visit } from '@ember/test-helpers';
+import { click, currentURL } from '@ember/test-helpers';
 import { module, test } from 'qunit';
 
 import { loadFixtures } from '@crates-io/msw/fixtures.js';
 import percySnapshot from '@percy/ember';
 import a11yAudit from 'ember-a11y-testing/test-support/audit';
 import { getPageTitle } from 'ember-page-title/test-support';
+import { http, HttpResponse } from 'msw';
 
 import { setupApplicationTest } from 'crates-io/tests/helpers';
 
 import axeConfig from '../axe-config';
+import { visit } from '../helpers/visit-ignoring-abort';
 
 module('Acceptance | crates page', function (hooks) {
   setupApplicationTest(hooks, { msw: true });
@@ -92,4 +94,25 @@ module('Acceptance | crates page', function (hooks) {
     let formatted = Number(2000).toLocaleString();
     assert.dom('[data-test-crate-row="0"] [data-test-recent-downloads]').hasText(`Recent: ${formatted}`);
   });
+
+  test('shows error message screen', async function (assert) {
+    loadFixtures(this.db);
+
+    let detail =
+      'Page 1 is unavailable for performance reasons. Please take a look at https://crates.io/data-access for alternatives.';
+    let error = HttpResponse.json({ errors: [{ detail }] }, { status: 400 });
+    this.worker.use(http.get('/api/v1/crates', () => error));
+
+    await visit('/crates');
+    assert.dom('[data-test-404-page]').exists();
+    assert.dom('[data-test-title]').hasText('Failed to load crate list');
+    assert.dom('[data-test-details]').hasText(detail);
+    assert.dom('[data-test-try-again]').exists();
+    assert.dom('[data-test-go-back]').doesNotExist();
+
+    this.worker.resetHandlers();
+    await click('[data-test-try-again]');
+    assert.dom('[data-test-404-page]').doesNotExist();
+    assert.dom('[data-test-crate-row]').exists({ count: 23 });
+  });
 });