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56 lines
1.9 KiB
TypeScript
56 lines
1.9 KiB
TypeScript
/**
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* Created by stefania on 7/17/17.
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*/
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import { Injectable } from '@angular/core';
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import { Http, Response } from '@angular/http';
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import { Observable } from 'rxjs/Rx';
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import { environment } from '../../../environments/environment';
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import { PageHelpContent } from '../../models/help-content/page-help-content';
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import { CachedContentItem } from './CachedContentItem';
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@Injectable()
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export class HelpContentService {
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private _helpServiceUrl = environment.HelpService.Url;
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cache = new Map<String, CachedContentItem>();
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constructor(private http: Http) {
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}
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getActivePageContent(route: string) {
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if (!this.cache.get(route) || !this.isValidCachedItem(route)) {
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return this.http.get(this._helpServiceUrl + '/page/route?q=' + route)
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.map(res => {
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this.cache.set(route, { timestamp: Date.now(), content: <PageHelpContent>res.json() });
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return res.json();
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})
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.catch(this.handleError);
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}
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return Observable.create(observer => observer.next(this.cache.get(route).content));
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}
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private extractData(res: Response) {
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const body = res.json();
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return body.data || {};
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}
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private handleError(error: Response | any) {
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// In a real world app, we might use a remote logging infrastructure
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// We'd also dig deeper into the error to get a better message
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let errMsg = '';
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if (error instanceof Response) {
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const body = error.text() || '';
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//const err = body.error || JSON.stringify(body);
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errMsg = `${error.status} - ${error.statusText || ''} ${body}`;
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} else {
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errMsg = (error.message) ? error.message :
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error.status ? `${error.status} - ${error.statusText}` : 'Server error';
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console.error(errMsg); // log to console instead
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}
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return Observable.throw(errMsg);
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}
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isValidCachedItem(route) {
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const cachedTimestamp = this.cache.get(route).timestamp;
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const currentTimestamp = Date.now();
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if (currentTimestamp - cachedTimestamp > 30000) { return false; } else { return true; }
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}
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}
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