import Knex from 'knex';

export type EndpointHandler = (req: any, res: any, knex: Knex) => Promise<void>;

export interface EndpointError {
    internalMessage: String;
    httpStatus: Number;
}

export function isEndpointError(obj: any): obj is EndpointError {
    return obj.internalMessage !== undefined &&
        obj.httpStatus !== undefined;
}

export const catchUnhandledErrors = (_e: any) => {
    if (isEndpointError(_e)) {
        // Rethrow
        throw _e;
    }

    // This is an unhandled error, make an internal server error out of it.
    const e: EndpointError = {
        internalMessage: _e,
        httpStatus: 500
    }
    throw e;
}