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Copy pathCachePrimedHttp.ts
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59 lines (49 loc) · 2.37 KB
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import { provide, Injectable, Provider } from 'angular2/core';
import { Connection, ConnectionBackend, Http, XHRBackend, RequestOptions, Request, RequestMethod, Response, ResponseOptions, ReadyState } from 'angular2/http';
@Injectable()
export class CachePrimedConnectionBackend extends ConnectionBackend {
private _preCachedResponses: PreCachedResponses;
constructor(private _underlyingBackend: ConnectionBackend, private _baseResponseOptions: ResponseOptions) {
super();
this._preCachedResponses = (<any>window).__preCachedResponses || {};
}
public createConnection(request: Request): Connection {
let cacheKey = request.url;
if (request.method === RequestMethod.Get && this._preCachedResponses.hasOwnProperty(cacheKey)) {
return new CacheHitConnection(request, this._preCachedResponses[cacheKey], this._baseResponseOptions);
} else {
return this._underlyingBackend.createConnection(request);
}
}
}
class CacheHitConnection implements Connection {
readyState: ReadyState;
request: Request;
response: any;
constructor (req: Request, cachedResponse: PreCachedResponse, baseResponseOptions: ResponseOptions) {
this.request = req;
this.readyState = ReadyState.Done;
// Workaround for difficulty consuming CommonJS default exports in TypeScript. Note that it has to be a dynamic
// 'require', and not an 'import' statement, because the module isn't available on the server.
let obsCtor: any = require('rxjs/Observable').Observable;
this.response = new obsCtor(responseObserver => {
let response = new Response(new ResponseOptions({ body: cachedResponse.body, status: cachedResponse.statusCode }));
responseObserver.next(response);
responseObserver.complete();
});
}
}
declare var require: any; // Part of the workaround mentioned below. Can remove this after updating Angular.
interface PreCachedResponses {
[url: string]: PreCachedResponse;
}
interface PreCachedResponse {
statusCode: number;
body: string;
}
export const CACHE_PRIMED_HTTP_PROVIDERS = [
provide(Http, {
useFactory: (xhrBackend, requestOptions, responseOptions) => new Http(new CachePrimedConnectionBackend(xhrBackend, responseOptions), requestOptions),
deps: [XHRBackend, RequestOptions, ResponseOptions]
}),
];