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middleware-utils.ts
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middleware-utils.ts
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import { MockRequest, Middleware, ResponseData } from './types.js';
const defaultFailure: ResponseData = {
status: 500,
statusText: 'Internal server error',
};
export default class MiddlewareUtils {
static combine(...middlewares: Middleware[]): Middleware {
return (request: MockRequest, response: ResponseData) => {
return middlewares.reduce(
(currentResponse, middleware) => currentResponse.then((resp) => middleware(request, resp)),
Promise.resolve(response)
);
};
}
static delayMiddleware(delayMs: number): Middleware {
return (request: MockRequest, response: ResponseData) => {
return new Promise<ResponseData>((resolve) => {
setTimeout(() => resolve(response), delayMs);
});
};
}
static failurerateMiddleware(
probabilityOfFailure: number,
failure: ResponseData = defaultFailure
): Middleware {
return (request: MockRequest, response: ResponseData) => {
return new Promise<ResponseData>((resolve) => {
const rnd = Math.random();
if (rnd < probabilityOfFailure) {
resolve(failure);
} else {
resolve(response);
}
});
};
}
static loggingMiddleware(): Middleware {
return (request, response) => {
// tslint:disable
console.groupCollapsed(`${request.method} ${request.url}`);
console.groupCollapsed('config');
console.log('queryParams', request.queryParams);
console.log('pathParams', request.pathParams);
console.log('body', request.body);
if (request.init) {
console.log('header', request.init.headers);
}
console.groupEnd();
try {
console.log('response', JSON.parse(response.body));
} catch (e) {
console.log('response', response);
}
console.groupEnd();
// tslint:enable
return response;
};
}
}