119 lines
3.9 KiB
TypeScript
119 lines
3.9 KiB
TypeScript
import * as plugins from './plugins.js';
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import { TypedHandler } from './typedrequest.classes.typedhandler.js';
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import { TypedRequest } from './typedrequest.classes.typedrequest.js';
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/**
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* A typed router decides on which typed handler to call based on the method
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* specified in the typed request
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* This is thought for reusing the same url endpoint for different methods
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*/
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export class TypedRouter {
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public routerMap = new plugins.lik.ObjectMap<TypedRouter>();
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public handlerMap = new plugins.lik.ObjectMap<
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TypedHandler<any & plugins.typedRequestInterfaces.ITypedRequest>
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>();
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public fireEventInterestMap = new plugins.lik.InterestMap<
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string,
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plugins.typedRequestInterfaces.ITypedRequest
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>((correlationId: string) => correlationId);
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/**
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* adds the handler to the routing map
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* @param typedHandlerArg
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*/
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public addTypedHandler<T extends plugins.typedRequestInterfaces.ITypedRequest>(
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typedHandlerArg: TypedHandler<T>
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) {
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// lets check for deduplication
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const existingTypedHandler = this.getTypedHandlerForMethod(typedHandlerArg.method);
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if (existingTypedHandler) {
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throw new Error(
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`a TypedHandler for ${typedHandlerArg.method} alredy exists! Can't add another one.`
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);
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}
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this.handlerMap.add(typedHandlerArg);
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}
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/**
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* adds another sub typedRouter
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* @param typedRequest
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*/
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public addTypedRouter(typedRouterArg: TypedRouter) {
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const routerExists = this.routerMap.findSync((routerArg) => routerArg === typedRouterArg);
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if (!routerExists) {
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this.routerMap.add(typedRouterArg);
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typedRouterArg.addTypedRouter(this);
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}
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}
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public checkForTypedHandler(methodArg: string): boolean {
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return !!this.getTypedHandlerForMethod(methodArg);
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}
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/**
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* gets a typed Router from the router chain, upstream and downstream
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* @param methodArg
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* @param checkUpstreamRouter
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*/
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public getTypedHandlerForMethod(
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methodArg: string,
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checkedRouters: TypedRouter[] = []
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): TypedHandler<any> {
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checkedRouters.push(this);
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let typedHandler: TypedHandler<any>;
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typedHandler = this.handlerMap.findSync((handler) => {
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return handler.method === methodArg;
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});
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if (!typedHandler) {
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this.routerMap.getArray().forEach((typedRouterArg) => {
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if (!typedHandler && !checkedRouters.includes(typedRouterArg)) {
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typedHandler = typedRouterArg.getTypedHandlerForMethod(methodArg, checkedRouters);
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}
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});
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}
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return typedHandler;
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}
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/**
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* if typedrequest object has correlation.phase === 'request' -> routes a typed request object to a handler
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* if typedrequest object has correlation.phase === 'response' -> routes a typed request object to request fire event
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* @param typedRequestArg
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*/
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public async routeAndAddResponse<
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T extends plugins.typedRequestInterfaces.ITypedRequest = plugins.typedRequestInterfaces.ITypedRequest
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>(typedRequestArg: T, localRequestArg = false): Promise<T> {
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if (typedRequestArg?.correlation?.phase === 'request' || localRequestArg) {
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const typedHandler = this.getTypedHandlerForMethod(typedRequestArg.method);
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if (!typedHandler) {
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console.log(`Cannot find handler for methodname ${typedRequestArg.method}`);
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typedRequestArg.error = {
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text: 'There is no available method for this call on the server side',
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data: {},
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};
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typedRequestArg.correlation.phase = 'response';
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return typedRequestArg;
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}
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typedRequestArg = await typedHandler.addResponse(typedRequestArg);
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return typedRequestArg;
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} else if (typedRequestArg?.correlation?.phase === 'response') {
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this.fireEventInterestMap
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.findInterest(typedRequestArg.correlation.id)
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?.fullfillInterest(typedRequestArg);
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return null;
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} else {
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console.log('received weirdly shaped request');
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console.log(typedRequestArg);
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return null;
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}
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}
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}
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