ui: add parameterized dispatch interface

ui/app/abilities/job.js

@@ -20,6 +20,9 @@ export default class Job extends AbstractAbility {
   @or('bypassAuthorization', 'selfTokenIsManagement')
   canListAll;
 
+  @or('bypassAuthorization', 'selfTokenIsManagement', 'policiesSupportDispatching')
+  canDispatch;
+
   @computed('rulesForNamespace.@each.capabilities')
   get policiesSupportRunning() {
     return this.namespaceIncludesCapability('submit-job');
@@ -29,4 +32,9 @@ export default class Job extends AbstractAbility {
   get policiesSupportScaling() {
     return this.namespaceIncludesCapability('scale-job');
   }
+
+  @computed('rulesForNamespace.@each.capabilities')
+  get policiesSupportDispatching() {
+    return this.namespaceIncludesCapability('dispatch-job');
+  }
 }

ui/app/adapters/job.js

@@ -1,5 +1,6 @@
 import WatchableNamespaceIDs from './watchable-namespace-ids';
 import addToPath from 'nomad-ui/utils/add-to-path';
+import { base64EncodeString } from 'nomad-ui/utils/encode';
 
 export default class JobAdapter extends WatchableNamespaceIDs {
   relationshipFallbackLinks = {
@@ -84,4 +85,14 @@ export default class JobAdapter extends WatchableNamespaceIDs {
       },
     });
   }
+
+  dispatch(job, meta, payload) {
+    const url = addToPath(this.urlForFindRecord(job.get('id'), 'job'), '/dispatch');
+    return this.ajax(url, 'POST', {
+      data: {
+        Payload: base64EncodeString(payload),
+        Meta: meta,
+      },
+    });
+  }
 }

ui/app/components/job-dispatch.js

@@ -0,0 +1,137 @@
+import Component from '@glimmer/component';
+import { tracked } from '@glimmer/tracking';
+import { inject as service } from '@ember/service';
+import { action } from '@ember/object';
+import { A } from '@ember/array';
+import { task } from 'ember-concurrency';
+import { noCase } from 'no-case';
+import { titleCase } from 'title-case';
+import messageFromAdapterError from 'nomad-ui/utils/message-from-adapter-error';
+
+class MetaField {
+  @tracked value;
+  @tracked error;
+
+  name;
+  required;
+  title;
+
+  constructor(meta) {
+    this.name = meta.name;
+    this.required = meta.required;
+    this.title = meta.title;
+    this.value = meta.value;
+    this.error = meta.error;
+  }
+
+  validate() {
+    this.error = '';
+
+    if (this.required && !this.value) {
+      this.error = `Missing required meta parameter "${this.name}".`;
+    }
+  }
+}
+
+export default class JobDispatch extends Component {
+  @service router;
+  @service config;
+
+  @tracked metaFields = [];
+  @tracked payload = '';
+  @tracked payloadHasError = false;
+
+  errors = A([]);
+
+  constructor() {
+    super(...arguments);
+
+    // Helper for mapping the params into a useable form.
+    const mapper = (values = [], required) =>
+      values.map(
+        x =>
+          new MetaField({
+            name: x,
+            required,
+            title: titleCase(noCase(x)),
+            value: this.args.job.meta ? this.args.job.meta[x] : '',
+          })
+      );
+
+    // Fetch the different types of parameters.
+    const required = mapper(this.args.job.parameterizedDetails.MetaRequired, true);
+    const optional = mapper(this.args.job.parameterizedDetails.MetaOptional, false);
+
+    // Merge them, required before optional.
+    this.metaFields = required.concat(optional);
+  }
+
+  get hasPayload() {
+    return this.args.job.parameterizedDetails.Payload !== 'forbidden';
+  }
+
+  get payloadRequired() {
+    return this.args.job.parameterizedDetails.Payload === 'required';
+  }
+
+  @action
+  dispatch() {
+    this.validateForm();
+    if (this.errors.length > 0) {
+      this.scrollToError();
+      return;
+    }
+
+    this.onDispatched.perform();
+  }
+
+  @action
+  cancel() {
+    this.router.transitionTo('jobs.job');
+  }
+
+  @task({ drop: true }) *onDispatched() {
+    // Try to create the dispatch.
+    try {
+      let paramValues = {};
+      this.metaFields.forEach(m => (paramValues[m.name] = m.value));
+      const dispatch = yield this.args.job.dispatch(paramValues, this.payload);
+
+      // Navigate to the newly created instance.
+      this.router.transitionTo('jobs.job', dispatch.DispatchedJobID);
+    } catch (err) {
+      const error = messageFromAdapterError(err) || 'Could not dispatch job';
+      this.errors.pushObject(error);
+      this.scrollToError();
+    }
+  }
+
+  scrollToError() {
+    if (!this.config.isTest) {
+      window.scrollTo(0, 0);
+    }
+  }
+
+  resetErrors() {
+    this.payloadHasError = false;
+    this.errors.clear();
+  }
+
+  validateForm() {
+    this.resetErrors();
+
+    // Make sure that we have all of the meta fields that we need.
+    this.metaFields.forEach(f => {
+      f.validate();
+      if (f.error) {
+        this.errors.pushObject(f.error);
+      }
+    });
+
+    // Validate payload.
+    if (this.payloadRequired && !this.payload) {
+      this.errors.pushObject('Missing required payload.');
+      this.payloadHasError = true;
+    }
+  }
+}

ui/app/models/job-dispatch.js

@@ -0,0 +1,10 @@
+import Model from '@ember-data/model';
+import { attr } from '@ember-data/model';
+
+export default class JobDispatch extends Model {
+  @attr() index;
+  @attr() jobCreateIndex;
+  @attr() evalCreateIndex;
+  @attr() evalID;
+  @attr() dispatchedJobID;
+}

ui/app/models/job.js

@@ -23,6 +23,7 @@ export default class Job extends Model {
   @attr('number') createIndex;
   @attr('number') modifyIndex;
   @attr('date') submitTime;
+  @attr() meta;
 
   // True when the job is the parent periodic or parameterized jobs
   // Instances of periodic or parameterized jobs are false for both properties
@@ -253,6 +254,10 @@ export default class Job extends Model {
     return this.store.adapterFor('job').scale(this, group, count, message);
   }
 
+  dispatch(meta, payload) {
+    return this.store.adapterFor('job').dispatch(this, meta, payload);
+  }
+
   setIdByPayload(payload) {
     const namespace = payload.Namespace || 'default';
     const id = payload.Name;

ui/app/models/task-group.js

@@ -22,6 +22,16 @@ export default class TaskGroup extends Fragment {
 
   @fragment('group-scaling') scaling;
 
+  @attr() meta;
+
+  @computed('job.meta', 'meta')
+  get mergedMeta() {
+    return {
+      ...this.job.meta,
+      ...this.meta,
+    };
+  }
+
   @computed('tasks.@each.driver')
   get drivers() {
     return this.tasks.mapBy('driver').uniq();

ui/app/models/task.js

@@ -10,6 +10,16 @@ export default class Task extends Fragment {
   @attr('string') driver;
   @attr('string') kind;
 
+  @attr() meta;
+
+  @computed('taskGroup.mergedMeta', 'meta')
+  get mergedMeta() {
+    return {
+      ...this.taskGroup.mergedMeta,
+      ...this.meta,
+    };
+  }
+
   @fragment('lifecycle') lifecycle;
 
   @computed('lifecycle', 'lifecycle.sidecar')

ui/app/router.js

@@ -20,6 +20,7 @@ Router.map(function() {
       this.route('definition');
       this.route('versions');
       this.route('deployments');
+      this.route('dispatch');
       this.route('evaluations');
       this.route('allocations');
     });

ui/app/routes/jobs/job/dispatch.js

@@ -0,0 +1,27 @@
+import Route from '@ember/routing/route';
+import { inject as service } from '@ember/service';
+
+export default class DispatchRoute extends Route {
+  @service can;
+
+  breadcrumbs = [
+    {
+      label: 'Dispatch',
+      args: ['jobs.job.dispatch'],
+    },
+  ];
+
+  beforeModel() {
+    const job = this.modelFor('jobs.job');
+    const namespace = job.namespace.get('name');
+    if (this.can.cannot('dispatch job', null, { namespace })) {
+      this.transitionTo('jobs.job');
+    }
+  }
+
+  model() {
+    const job = this.modelFor('jobs.job');
+    if (!job) return this.transitionTo('jobs.job');
+    return job;
+  }
+}

ui/app/templates/components/job-dispatch.hbs

@@ -0,0 +1,77 @@
+{{#if this.errors}}
+  <div data-test-dispatch-error class="notification is-danger">
+    <h3 class="title is-4" data-test-parse-error-title>Dispatch Error</h3>
+    <ul>
+      {{#each this.errors as |error|}}
+        <li>{{error}}</li>
+      {{/each}}
+    </ul>
+  </div>
+{{/if}}
+
+<form action="#" onsubmit="return false">
+  <h1 class="title">Dispatch an instance of '{{@job.name}}'</h1>
+
+  {{#each this.metaFields as |meta|}}
+    <div class="columns">
+        <div class="column is-6">
+          <div data-test-meta-field="{{ if meta.required "required" "optional" }}" class="field">
+            <label data-test-meta-field-label class="label {{if meta.error "has-text-danger"}}" for="{{meta.name}}">
+              {{meta.title}} {{#if meta.required}}*{{/if}}
+            </label>
+            <div class="control">
+              <input
+                data-test-meta-field-input
+                id="{{meta.name}}"
+                class="input {{if meta.error "is-danger"}}"
+                type="text"
+                value={{meta.value}}
+                oninput={{action (mut meta.value) value="target.value"}}
+                required={{meta.required}} >
+
+              <p class="help {{if meta.error "has-text-danger"}}">
+                {{#if meta.required}}Required{{else}}Optional{{/if}}
+                Meta Param
+                <span class="badge is-light is-faded">
+                  <code>{{ meta.name }}</code>
+                </span>
+              </p>
+            </div>
+          </div>
+        </div>
+    </div>
+  {{/each}}
+
+  <div class="boxed-section {{if this.payloadHasError "is-danger"}}">
+    <div data-test-payload-head class="boxed-section-head">
+      Payload {{#if this.payloadRequired}}*{{/if}}
+    </div>
+    {{#if this.hasPayload}}
+      <div class="boxed-section-body is-full-bleed">
+        <IvyCodemirror
+          data-test-payload-editor
+          aria-label="Payload definition"
+          @valueUpdated={{action (mut this.payload)}}
+          @options={{hash
+            mode="javascript"
+            theme="hashi"
+            screenReaderLabel="Payload definition editor"
+            tabSize=2
+            lineNumbers=true
+          }} />
+      </div>
+    {{else}}
+      <div class="boxed-section-body">
+        <div data-test-empty-payload-message class="empty-message">
+          <h3 class="empty-message-headline">Payload Disabled</h3>
+          <p class="empty-message-body">Payload is disabled for this job.</p>
+        </div>
+      </div>
+    {{/if}}
+  </div>
+
+  <div>
+    <button data-test-dispatch-button class="button is-primary" type="button" onclick={{action "dispatch"}}>Dispatch</button>
+    <button data-test-cancel-button class="button is-white" type="button" onclick={{action "cancel"}}>Cancel</button>
+  </div>
+</form>

ui/app/templates/components/job-page/parameterized-child.hbs

@@ -31,6 +31,27 @@
 
   <JobPage::Parts::RecentAllocations @job={{this.job}} />
 
+  <div class="boxed-section">
+    <div class="boxed-section-head">
+      Meta
+    </div>
+    {{#if this.job.definition.Meta}}
+      <div class="boxed-section-body is-full-bleed">
+        <AttributesTable
+          data-test-meta
+          @attributePairs={{this.job.definition.Meta}}
+          @class="attributes-table" />
+      </div>
+    {{else}}
+      <div class="boxed-section-body">
+        <div data-test-empty-meta-message class="empty-message">
+          <h3 class="empty-message-headline">No Meta Attributes</h3>
+          <p class="empty-message-body">This job is configured with no meta attributes.</p>
+        </div>
+      </div>
+    {{/if}}
+  </div>
+
   <div class="boxed-section">
     <div class="boxed-section-head">Payload</div>
     <div class="boxed-section-body is-dark">