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## Why? - During Angular universal application loading, the API requests were running even if the data was already rendered from the server. - The router was flickering on angular universal first page load. - Product detail page shown as blank when data is fetching from api. ## This change addresses the need by: - added state transfer interceptor to check for stored data in state and avoid api calls if data already sent from SSR server - Fixed route resolve issue for product detail - Bug fix for app route flicker on universal boot. Fix shown in this [angular Issue.](angular/angular#15716 (comment))
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
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@@ -4,4 +4,4 @@ | |
| "default": "angularspree", | ||
| "staging": "angularspree" | ||
| } | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,24 +1,39 @@ | ||
| { | ||
| "index": "/index.html", | ||
| "assetGroups": [{ | ||
| "name": "app", | ||
| "installMode": "prefetch", | ||
| "resources": { | ||
| "files": [ | ||
| "/favicon.ico", | ||
| "/index.html", | ||
| "/*.css", | ||
| "/*.js" | ||
| ] | ||
| "dataGroups": [ | ||
| { | ||
| "name": "api-performance", | ||
| "urls": [ | ||
| "/products" | ||
| ], | ||
| "cacheConfig": { | ||
| "strategy": "freshness", | ||
| "maxSize": 100, | ||
| "maxAge": "3d" | ||
| } | ||
| } | ||
| }, { | ||
| "name": "assets", | ||
| "installMode": "lazy", | ||
| "updateMode": "prefetch", | ||
| "resources": { | ||
| "files": [ | ||
| "/assets/**" | ||
| ] | ||
| ], | ||
| "assetGroups": [ | ||
| { | ||
| "name": "app", | ||
| "installMode": "prefetch", | ||
| "resources": { | ||
| "files": [ | ||
| "/favicon.ico", | ||
| "/index.html", | ||
| "/*.css", | ||
| "/*.js" | ||
| ] | ||
| } | ||
| }, { | ||
| "name": "assets", | ||
| "installMode": "lazy", | ||
| "updateMode": "prefetch", | ||
| "resources": { | ||
| "files": [ | ||
| "/assets/**" | ||
| ] | ||
| } | ||
| } | ||
| }] | ||
| } | ||
| ] | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| import { tap } from 'rxjs/operators'; | ||
| import { Observable, of } from 'rxjs'; | ||
| import { Injectable } from '@angular/core'; | ||
| import { | ||
| HttpRequest, | ||
| HttpHandler, | ||
| HttpEvent, | ||
| HttpInterceptor, | ||
| HttpResponse | ||
| } from '@angular/common/http'; | ||
| import { TransferStateService } from '../services/transfer-state.service'; | ||
|
|
||
| @Injectable() | ||
| export class TransferStateInterceptor implements HttpInterceptor { | ||
| constructor(private transferStateService: TransferStateService) { | ||
| } | ||
|
|
||
| intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> { | ||
| /** | ||
| * Skip this interceptor if the request method isn't GET. | ||
| */ | ||
| if (req.method !== 'GET') { | ||
| return next.handle(req); | ||
| } | ||
|
|
||
| const cachedResponse = this.transferStateService.getCache(req.url); | ||
| if (cachedResponse) { | ||
| // A cached response exists which means server set it before. Serve it instead of forwarding | ||
| // the request to the next handler. | ||
| return of(new HttpResponse<any>({ body: cachedResponse })); | ||
| } | ||
|
|
||
| /** | ||
| * No cached response exists. Go to the network, and cache | ||
| * the response when it arrives. | ||
| */ | ||
| return next.handle(req).pipe( | ||
| tap(event => { | ||
| if (event instanceof HttpResponse) { | ||
| this.transferStateService.setCache(req.url, event.body); | ||
| } | ||
| }) | ||
| ); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| import { Inject, Injectable, PLATFORM_ID } from '@angular/core'; | ||
| import { TransferState, makeStateKey } from '@angular/platform-browser'; | ||
| import { isPlatformBrowser } from '@angular/common'; | ||
|
|
||
| /** | ||
| * Keep caches (makeStateKey) into it in each `setCache` function call | ||
| * @type {any[]} | ||
| */ | ||
| const transferStateCache: String[] = []; | ||
|
|
||
| @Injectable() | ||
| export class TransferStateService { | ||
| constructor(private transferState: TransferState, | ||
| @Inject(PLATFORM_ID) private platformId: Object, | ||
| // @Inject(APP_ID) private _appId: string | ||
| ) { | ||
| } | ||
|
|
||
| /** | ||
| * Set cache only when it's running on server | ||
| * @param {string} key | ||
| * @param data Data to store to cache | ||
| */ | ||
| setCache(key: string, data: any) { | ||
| if (!isPlatformBrowser(this.platformId)) { | ||
| transferStateCache[key] = makeStateKey<any>(key); | ||
| this.transferState.set(transferStateCache[key], data); | ||
| } | ||
| } | ||
|
|
||
|
|
||
| /** | ||
| * Returns stored cache only when it's running on browser | ||
| * @param {string} key | ||
| * @returns {any} cachedData | ||
| */ | ||
| getCache(key: string): any { | ||
| if (isPlatformBrowser(this.platformId)) { | ||
| const cachedData: any = this.transferState['store'][key]; | ||
| /** | ||
| * Delete the cache to request the data from network next time which is the | ||
| * user's expected behavior | ||
| */ | ||
| delete this.transferState['store'][key]; | ||
| return cachedData; | ||
| } | ||
| } | ||
| } |
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