Request priority (#5737)

* Set priority of couch requests to high
* Set priority of image requests to low
* Add e2e test for low-priority images

e2e/tests/functional/plugins/imagery/exampleImagery.e2e.spec.js

@@ -212,6 +212,10 @@ test.describe('Example Imagery Object', () => {
         await expect(pausePlayButton).not.toHaveClass(/is-paused/);
     });
 
+    test('Uses low fetch priority', async ({ page }) => {
+        const priority = await page.locator('.js-imageryView-image').getAttribute('fetchpriority');
+        await expect(priority).toBe('low');
+    });
 });
 
 // The following test case will cover these scenarios

src/plugins/imagery/components/ImageThumbnail.vue

@@ -38,6 +38,7 @@
         <img
             class="c-thumb__image"
             :src="image.url"
+            fetchpriority="low"
         >
     </a>
     <div class="c-thumb__timestamp">{{ image.formattedTime }}</div>

src/plugins/imagery/components/ImageryView.vue

@@ -82,6 +82,7 @@
                     }"
                     :data-openmct-image-timestamp="time"
                     :data-openmct-object-keystring="keyString"
+                    fetchpriority="low"
                 >
                 <div
                     v-if="imageUrl"

src/plugins/persistence/couch/CouchObjectProvider.js

@@ -187,6 +187,7 @@ class CouchObjectProvider {
         let fetchOptions = {
             method,
             body,
+            priority: 'high',
             signal
         };
 

src/plugins/persistence/couch/pluginSpec.js

@@ -109,6 +109,12 @@ describe('the plugin', () => {
             expect(result.identifier.key).toEqual(mockDomainObject.identifier.key);
         });
 
+        it('prioritizes couch requests above other requests', async () => {
+            await openmct.objects.get(mockDomainObject.identifier);
+            const fetchOptions = fetch.calls.mostRecent().args[1];
+            expect(fetchOptions.priority).toEqual('high');
+        });
+
         it('creates an object and starts shared worker', async () => {
             const result = await openmct.objects.save(mockDomainObject);
             expect(provider.create).toHaveBeenCalled();