typedrequest/ts/typedrequest.classes.typedhandler.ts

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import * as plugins from './typedrequest.plugins.js';
import { TypedResponseError } from './typedrequest.classes.typedresponseerror.js';
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export type THandlerFunction<T extends plugins.typedRequestInterfaces.ITypedRequest> = (
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requestArg: T['request']
) => Promise<T['response']>;
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/**
* typed handler for dealing with typed requests
*/
export class TypedHandler<T extends plugins.typedRequestInterfaces.ITypedRequest> {
public method: string;
private handlerFunction: THandlerFunction<T>;
constructor(methodArg: T['method'], handlerFunctionArg: THandlerFunction<T>) {
this.method = methodArg;
this.handlerFunction = handlerFunctionArg;
}
/**
* adds a response to the typedRequest
* @param typedRequestArg
*/
public async addResponse(typedRequestArg: T) {
if (typedRequestArg.method !== this.method) {
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throw new Error(
'this handler has been given a wrong method to answer to. Please use a TypedRouter to filter requests'
);
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}
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let typedResponseError: TypedResponseError;
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const response = await this.handlerFunction(typedRequestArg.request).catch((e) => {
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if (e instanceof TypedResponseError) {
typedResponseError = e;
} else {
throw e;
}
});
if (typedResponseError) {
typedRequestArg.error = {
text: typedResponseError.errorText,
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data: typedResponseError.errorData,
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};
}
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if (response) {
typedRequestArg.response = response;
}
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typedRequestArg?.correlation?.phase ? (typedRequestArg.correlation.phase = 'response') : null;
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return typedRequestArg;
}
}