109 lines
3.1 KiB
TypeScript
109 lines
3.1 KiB
TypeScript
import * as plugins from './typedrequest.plugins';
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import { TypedHandler } from './typedrequest.classes.typedhandler';
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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 upstreamTypedRouter: 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<plugins.typedRequestInterfaces.ITypedRequest>
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>();
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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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this.routerMap.add(typedRouterArg);
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}
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public setUpstreamTypedRouter(typedRouterArg: TypedRouter) {
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this.upstreamTypedRouter = typedRouterArg;
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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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checkUpstreamRouter = true
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): TypedHandler<any> {
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let typedHandler: TypedHandler<any>;
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if (this.upstreamTypedRouter && checkUpstreamRouter) {
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typedHandler = this.upstreamTypedRouter.getTypedHandlerForMethod(methodArg);
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} else {
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typedHandler = this.handlerMap.find(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(typedRouter => {
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if (!typedHandler) {
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typedHandler = typedRouter.getTypedHandlerForMethod(methodArg, false);
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}
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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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* routes a typed request to a handler
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* @param typedRequestArg
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*/
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public async routeAndAddResponse(typedRequestArg: plugins.typedRequestInterfaces.ITypedRequest) {
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const typedHandler = this.getTypedHandlerForMethod(typedRequestArg.method);
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if (!typedHandler) {
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const availableMethods: string[] = [];
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await this.handlerMap.forEach(async handler => {
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availableMethods.push(handler.method);
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});
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console.log(`Cannot find method for ${typedHandler}`);
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console.log(`Available methods are:`);
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console.log(availableMethods);
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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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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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}
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}
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