typedrequest/ts/typedrequest.classes.typedrouter.ts

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import * as plugins from './plugins.js';
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import { VirtualStream } from './typedrequest.classes.virtualstream.js';
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import { TypedHandler } from './typedrequest.classes.typedhandler.js';
import { TypedRequest } from './typedrequest.classes.typedrequest.js';
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/**
* A typed router decides on which typed handler to call based on the method
* specified in the typed request
* This is thought for reusing the same url endpoint for different methods
*/
export class TypedRouter {
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public routerMap = new plugins.lik.ObjectMap<TypedRouter>();
public handlerMap = new plugins.lik.ObjectMap<
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TypedHandler<any & plugins.typedRequestInterfaces.ITypedRequest>
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>();
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public registeredVirtualStreams = new plugins.lik.ObjectMap<VirtualStream<any>>();
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public fireEventInterestMap = new plugins.lik.InterestMap<
string,
plugins.typedRequestInterfaces.ITypedRequest
>((correlationId: string) => correlationId);
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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
const existingTypedHandler = this.getTypedHandlerForMethod(typedHandlerArg.method);
if (existingTypedHandler) {
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throw new Error(
`a TypedHandler for ${typedHandlerArg.method} alredy exists! Can't add another one.`
);
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}
this.handlerMap.add(typedHandlerArg);
}
/**
* adds another sub typedRouter
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* @param typedRequest
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*/
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public addTypedRouter(typedRouterArg: TypedRouter) {
const routerExists = this.routerMap.findSync((routerArg) => routerArg === typedRouterArg);
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if (!routerExists) {
this.routerMap.add(typedRouterArg);
typedRouterArg.addTypedRouter(this);
}
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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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}
/**
* gets a typed Router from the router chain, upstream and downstream
* @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) => {
return handler.method === methodArg;
});
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if (!typedHandler) {
this.routerMap.getArray().forEach((typedRouterArg) => {
if (!typedHandler && !checkedRouters.includes(typedRouterArg)) {
typedHandler = typedRouterArg.getTypedHandlerForMethod(methodArg, checkedRouters);
}
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});
}
return typedHandler;
}
/**
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* if typedrequest object has correlation.phase === 'request' -> routes a typed request object to a handler
* 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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public async routeAndAddResponse<
T extends plugins.typedRequestInterfaces.ITypedRequest = plugins.typedRequestInterfaces.ITypedRequest
>(typedRequestArg: T, localRequestArg = false): Promise<T> {
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// decoding first
typedRequestArg = VirtualStream.decodePayloadFromNetwork(typedRequestArg, {
typedrouter: this,
});
// localdata second
typedRequestArg.localData = typedRequestArg.localData || {};
typedRequestArg.localData.firstTypedrouter = this;
// lets do stream processing
if (typedRequestArg.method === '##VirtualStream##') {
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const result: any = await this.handleStreamTypedRequest(typedRequestArg as plugins.typedRequestInterfaces.IStreamRequest);
result.localData = null;
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return result as T;
}
// lets do normal routing
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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) {
console.log(`Cannot find handler for methodname ${typedRequestArg.method}`);
typedRequestArg.error = {
text: 'There is no available method for this call on the server side',
data: {},
};
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typedRequestArg.correlation.phase = 'response';
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// encode again before handing back
typedRequestArg = VirtualStream.encodePayloadForNetwork(typedRequestArg, {
typedrouter: this,
});
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return typedRequestArg;
}
typedRequestArg = await typedHandler.addResponse(typedRequestArg);
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typedRequestArg.localData = null;
// encode again before handing back
typedRequestArg = VirtualStream.encodePayloadForNetwork(typedRequestArg, {
typedrouter: this,
});
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return typedRequestArg;
} else if (typedRequestArg?.correlation?.phase === 'response') {
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this.fireEventInterestMap
.findInterest(typedRequestArg.correlation.id)
?.fullfillInterest(typedRequestArg);
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return null;
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} else {
console.log('received weirdly shaped request');
console.log(typedRequestArg);
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return null;
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}
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}
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/**
* handle streaming
* @param streamTrArg
*/
public async handleStreamTypedRequest(streamTrArg: plugins.typedRequestInterfaces.IStreamRequest) {
const relevantVirtualStream = await this.registeredVirtualStreams.find(async virtualStreamArg => {
return virtualStreamArg.streamId === streamTrArg.request.streamId;
});
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if (!relevantVirtualStream) {
console.log(`no relevant virtual stream found for stream with id ${streamTrArg.request.streamId}`);
console.log(this.registeredVirtualStreams.getArray());
return streamTrArg;
} else {
console.log(`success: found relevant virtual stream with id ${streamTrArg.request.streamId}`);
}
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const result = await relevantVirtualStream.handleStreamTr(streamTrArg);
return result;
}
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}