Gauge fixes for NaN and composition policy

e2e/tests/functional/plugins/gauge/gauge.e2e.spec.js

@@ -25,7 +25,10 @@
  */
 
 const { test, expect } = require('../../../../pluginFixtures');
-const { createDomainObjectWithDefaults } = require('../../../../appActions');
+const {
+  createDomainObjectWithDefaults,
+  createExampleTelemetryObject
+} = require('../../../../appActions');
 const uuid = require('uuid').v4;
 
 test.describe('Gauge', () => {
@@ -133,4 +136,50 @@ test.describe('Gauge', () => {
 
     // TODO: Verify changes in the UI
   });
+
+  test('Gauge does not display NaN when data not available', async ({ page }) => {
+    // Create a Gauge
+    const gauge = await createDomainObjectWithDefaults(page, {
+      type: 'Gauge'
+    });
+
+    // Create a Sine Wave Generator in the Gauge with a loading delay
+    const swgWith5sDelay = await createExampleTelemetryObject(page, gauge.uuid);
+
+    await page.goto(swgWith5sDelay.url);
+    await page.getByTitle('More options').click();
+    await page.getByRole('menuitem', { name: /Edit Properties.../ }).click();
+
+    //Edit Example Telemetry Object to include 5s loading Delay
+    await page.locator('[aria-label="Loading Delay \\(ms\\)"]').fill('5000');
+
+    await page.getByRole('button', { name: 'Save' }).click();
+
+    // Wait until the URL is updated
+    await page.waitForURL(`**/${gauge.uuid}/*`);
+
+    // Nav to the Gauge
+    await page.goto(gauge.url);
+    const gaugeNoDataText = await page.locator('.js-dial-current-value tspan').textContent();
+    expect(gaugeNoDataText).toBe('--');
+  });
+
+  test('Gauge enforces composition policy', async ({ page }) => {
+    // Create a Gauge
+    await createDomainObjectWithDefaults(page, {
+      type: 'Gauge',
+      name: 'Unnamed Gauge'
+    });
+
+    // Try to create a Folder into the Gauge. Should be disallowed.
+    await page.getByRole('button', { name: /Create/ }).click();
+    await page.getByRole('menuitem', { name: /Folder/ }).click();
+    await expect(page.locator('[aria-label="Save"]')).toBeDisabled();
+    await page.getByLabel('Cancel').click();
+
+    // Try to create a Display Layout into the Gauge. Should be disallowed.
+    await page.getByRole('button', { name: /Create/ }).click();
+    await page.getByRole('menuitem', { name: /Display Layout/ }).click();
+    await expect(page.locator('[aria-label="Save"]')).toBeDisabled();
+  });
 });

src/plugins/gauge/GaugeCompositionPolicy.js

@@ -0,0 +1,51 @@
+/*****************************************************************************
+ * Open MCT, Copyright (c) 2014-2023, United States Government
+ * as represented by the Administrator of the National Aeronautics and Space
+ * Administration. All rights reserved.
+ *
+ * Open MCT is licensed under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * http://www.apache.org/licenses/LICENSE-2.0.
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ *
+ * Open MCT includes source code licensed under additional open source
+ * licenses. See the Open Source Licenses file (LICENSES.md) included with
+ * this source code distribution or the Licensing information page available
+ * at runtime from the About dialog for additional information.
+ *****************************************************************************/
+
+export default function GaugeCompositionPolicy(openmct) {
+  function hasNumericTelemetry(domainObject) {
+    const hasTelemetry = openmct.telemetry.isTelemetryObject(domainObject);
+    if (!hasTelemetry) {
+      return false;
+    }
+
+    const metadata = openmct.telemetry.getMetadata(domainObject);
+
+    return metadata.values().length > 0 && hasDomainAndRange(metadata);
+  }
+
+  function hasDomainAndRange(metadata) {
+    return (
+      metadata.valuesForHints(['range']).length > 0 &&
+      metadata.valuesForHints(['domain']).length > 0
+    );
+  }
+
+  return {
+    allow: function (parent, child) {
+      if (parent.type === 'gauge') {
+        return hasNumericTelemetry(child);
+      }
+
+      return true;
+    }
+  };
+}

src/plugins/gauge/GaugePlugin.js

@@ -23,6 +23,7 @@
 import mount from 'utils/mount';
 
 import GaugeFormController from './components/GaugeFormController.vue';
+import GaugeCompositionPolicy from './GaugeCompositionPolicy';
 import GaugeViewProvider from './GaugeViewProvider';
 
 export const GAUGE_TYPES = [
@@ -165,6 +166,7 @@ export default function () {
         }
       ]
     });
+    openmct.composition.addPolicy(new GaugeCompositionPolicy(openmct).allow);
   };
 
   function getGaugeFormController(openmct) {

src/plugins/gauge/components/GaugeComponent.vue

@@ -408,10 +408,10 @@ export default {
       const CHAR_THRESHOLD = 3;
       const START_PERC = 8.5;
       const REDUCE_PERC = 0.8;
-      const RANGE_CHARS_MAX = Math.max(
-        this.rangeLow.toString().length,
-        this.rangeHigh.toString().length
-      );
+      const RANGE_CHARS_MAX =
+        this.rangeLow && this.rangeHigh
+          ? Math.max(this.rangeLow.toString().length, this.rangeHigh.toString().length)
+          : CHAR_THRESHOLD;
 
       return this.fontSizeFromChars(RANGE_CHARS_MAX, CHAR_THRESHOLD, START_PERC, REDUCE_PERC);
     },