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| import {Template} from "./template";
import {GatewayStorefrontInstance} from "./gatewayStorefront";
import {EVENTS} from "./enums";
import {
ICookieMap,
ICookieObject,
IFragmentEndpointHandler,
IGatewayMap,
IPageDependentGateways,
IResponseHandlers
} from "./types";
import {DEBUG_INFORMATION, DEBUG_QUERY_NAME} from "./config";
import express from "express";
import {nrSegment, nrSegmentAsync} from "./decorators";
export class Page {
ready = false;
gatewayDependencies: IPageDependentGateways;
responseHandlers: IResponseHandlers = {};
private waitingCompilers: { [key: string]: Promise<IFragmentEndpointHandler> } = {};
private template: Template;
private rawHtml: string;
private prgEnabled = false;
constructor(html: string, gatewayMap: IGatewayMap, public name: string) {
this.rawHtml = html;
this.template = new Template(html, this.name);
this.gatewayDependencies = this.template.getDependencies();
this.preparePageDependencies(gatewayMap);
this.checkPageReady();
}
/**
* Request handler, compiles template if not exists
* @param {{cookies: ICookieObject}} req
* @param {object} res
* @returns {Promise<void>}
*/
@nrSegmentAsync("page.handle", true)
async handle(req: { cookies: ICookieObject, query: { [name: string]: string } }, res: object) {
const isDebug = DEBUG_INFORMATION || (req.query && req.query.hasOwnProperty(DEBUG_QUERY_NAME));
const handlerVersion = this.getHandlerVersion(req.cookies);
const compileVersion = `${handlerVersion}_${isDebug}`;
Iif (!this.responseHandlers[compileVersion]) {
const waitedCompileProcess = this.waitingCompilers[compileVersion];
if (waitedCompileProcess) {
await waitedCompileProcess;
} else {
this.waitingCompilers[compileVersion] = this.template.compile(req.cookies, isDebug);
this.waitingCompilers[compileVersion]
.then(handler => {
this.responseHandlers[compileVersion] = handler;
});
}
}
this.responseHandlers[compileVersion](req, res);
}
post(req: express.Request, res: express.Response, next: express.NextFunction) {
if (this.prgEnabled) {
res.redirect(303, req.originalUrl);
} else {
next();
}
}
async reCompile() {
const defaultVersion = this.getHandlerVersion({}, true);
this.responseHandlers[`${defaultVersion}_true`] = await this.template.compile({}, true, true);
this.responseHandlers[`${defaultVersion}_false`] = await this.template.compile({}, false, true);
}
/**
* Prepares dependencies and subscribes to events.
* @param {IGatewayMap} gatewayMap
*/
private preparePageDependencies(gatewayMap: IGatewayMap) {
Object.keys(gatewayMap)
.filter(gatewayName => this.gatewayDependencies.gateways[gatewayMap[gatewayName].name])
.forEach(gatewayName => {
gatewayMap[gatewayName].events.on(EVENTS.GATEWAY_UPDATED, this.gatewayUpdated.bind(this));
this.gatewayDependencies.gateways[gatewayName].gateway = gatewayMap[gatewayName];
if (!!gatewayMap[gatewayName].config) {
this.gatewayDependencies.gateways[gatewayName].ready = true;
} else {
gatewayMap[gatewayName].events.once(EVENTS.GATEWAY_READY, this.gatewayReady.bind(this));
}
});
}
/**
* Checks for page dependencies are ready
*/
private checkPageReady(): void {
if (Object.keys(this.gatewayDependencies.gateways).filter(gatewayName => !this.gatewayDependencies.gateways[gatewayName].ready).length === 0) {
this.ready = true;
}
}
/**
* Based on test cookies returns handler key
* @returns {string}
* @param query
* @param cookies
*/
@nrSegment("page.getHandlerVersion", true)
private getHandlerVersion(cookies: ICookieMap, preCompile = false) {
return Object.values(this.gatewayDependencies.fragments)
.reduce((key, fragment) => {
return `${key}_${fragment.instance.name}|${fragment.instance.detectVersion(cookies, preCompile)}`;
}, '');
}
private updatePrgStatus() {
this.prgEnabled = Object
.values(this.gatewayDependencies.fragments)
.some(fragment => !!(fragment.instance.config && fragment.instance.config.prg && fragment.instance.primary));
}
/**
* Called on GATEWAY_UPDATED
* @param {GatewayStorefrontInstance} gateway
*/
private gatewayUpdated(gateway: GatewayStorefrontInstance) {
this.updateFragmentsConfig(gateway);
this.template.load();
this.updatePrgStatus();
this.reCompile();
}
/**
* Updates fragment config based on gateway configuration
* @param {GatewayStorefrontInstance} gateway
*/
private updateFragmentsConfig(gateway: GatewayStorefrontInstance) {
Object.values(this.gatewayDependencies.fragments).forEach(fragment => {
if (fragment.gateway === gateway.name && gateway.config) {
fragment.instance.update(gateway.config.fragments[fragment.instance.name], gateway.url, gateway.name, gateway.assetUrl);
}
});
}
/**
* Called on GATEWAY_READY
* @param {GatewayStorefrontInstance} gateway
*/
private gatewayReady(gateway: GatewayStorefrontInstance) {
this.gatewayDependencies.gateways[gateway.name].ready = true;
this.updateFragmentsConfig(gateway);
this.updatePrgStatus();
this.checkPageReady();
}
}
|