Restart a single task from the task detail page

ui/app/controllers/allocations/allocation/task/index.js

@@ -1,6 +1,7 @@
 import Controller from '@ember/controller';
 import { computed } from '@ember/object';
 import { alias } from '@ember/object/computed';
+import { task } from 'ember-concurrency';
 
 export default Controller.extend({
   network: alias('model.resources.networks.firstObject'),
@@ -20,4 +21,25 @@ export default Controller.extend({
       )
       .sortBy('name');
   }),
+
+  error: computed(() => {
+    // { title, description }
+    return null;
+  }),
+
+  onDismiss() {
+    this.set('error', null);
+  },
+
+  restartTask: task(function*() {
+    try {
+      yield this.model.restart();
+    } catch (err) {
+      console.log('OOPs', err);
+      this.set('error', {
+        title: 'Could Not Restart Task',
+        description: 'Your ACL token does not grant allocation lifecyle permissions.',
+      });
+    }
+  }),
 });

ui/app/templates/allocations/allocation/task/index.hbs

@@ -1,8 +1,33 @@
 {{partial "allocations/allocation/task/subnav"}}
 <section class="section">
+  {{#if error}}
+    <div class="notification is-danger">
+      <div class="columns">
+        <div class="column">
+          <h3 data-test-error-title class="title is-4">{{error.title}}</h3>
+          <p data-test-error-body>{{error.description}}</p>
+        </div>
+        <div class="column is-centered is-minimum">
+          <button data-test-error-close class="button is-danger" onclick={{action onDismiss}}>Okay</button>
+        </div>
+      </div>
+    </div>
+  {{/if}}
+
   <h1 class="title" data-test-title>
     {{model.name}}
     <span class="bumper-left tag {{model.stateClass}}" data-test-state>{{model.state}}</span>
+    {{#if model.isRunning}}
+      {{two-step-button
+        data-test-restart
+        idleText="Restart"
+        cancelText="Cancel"
+        confirmText="Yes, Restart"
+        confirmationMessage="Are you sure? This will restart the task in-place."
+        awaitingConfirmation=restartTask.isRunning
+        disabled=restartTask.isRunning
+        onConfirm=(perform restartTask)}}
+    {{/if}}
   </h1>
 
   <div class="boxed-section is-small">