routes/crate: Avoid awaiting versions unless they are required

Author: eth3lbert

app/controllers/crate/version.js

@@ -24,7 +24,6 @@ export default class CrateVersionController extends Controller {
     this.stackedGraph = false;
   }
 
-  @alias('loadDownloadsTask.last.value') downloads;
   @alias('model.crate') crate;
   @alias('model.requestedVersion') requestedVersion;
   @alias('model.version') currentVersion;
@@ -64,6 +63,17 @@ export default class CrateVersionController extends Controller {
     return readme;
   });
 
+  /** @return {import("../../models/version-download").default | null} */
+  get downloads() {
+    let crate = this.crate;
+    let downloads = this.loadDownloadsTask.last?.value;
+    if (!downloads || !crate.versionsObj) {
+      return null;
+    }
+    let allLoaded = downloads.every(d => !!crate.versionsObj[d.belongsTo('version').id()]);
+    if (allLoaded) return downloads;
+  }
+
   // This task would be `perform()` in setupController
   loadDownloadsTask = task(async () => {
     let downloads = await this.downloadsContext.version_downloads;

app/routes/crate/version-dependencies.js

@@ -34,15 +34,12 @@ export default class VersionRoute extends Route {
     return version;
   }
 
-  async afterModel(_resolvedModel, transition) {
+  afterModel(_resolvedModel, transition) {
     let crate = this.modelFor('crate');
-    // TODO: Resolved version without waiting for versions to be resolved
-    try {
-      await crate.loadVersionsTask.perform();
-    } catch (error) {
+    crate.loadVersionsTask.perform().catch(error => {
       let title = `${crate.name}: Failed to load version data`;
       return this.router.replaceWith('catch-all', { transition, error, title, tryAgain: true });
-    }
+    });
   }
 
   setupController(controller, model) {

app/routes/crate/version.js

@@ -15,14 +15,10 @@ export default class VersionRoute extends Route {
   async model(params, transition) {
     let crate = this.modelFor('crate');
 
-    // TODO: Resolved version without waiting for versions to be resolved
-    let versions;
-    try {
-      versions = await crate.loadVersionsTask.perform();
-    } catch (error) {
+    let versions = crate.loadVersionsTask.perform().catch(error => {
       let title = `${crate.name}: Failed to load version data`;
       return this.router.replaceWith('catch-all', { transition, error, title, tryAgain: true });
-    }
+    });
 
     let version;
     let requestedVersion = params.version_num;
@@ -56,6 +52,7 @@ export default class VersionRoute extends Route {
           }));
 
       if (!version) {
+        versions = await versions;
         let versionNums = versions.map(it => it.num);
         semverSort(versionNums, { loose: true });