@vizydrop/correlation-id/lib/utils.js

Vizydrop correlation id helper based on async hooks

/*********************************************************************
* © Copyright IBM Corp. 2025
*********************************************************************/
let headerName;

module.exports = {
    getHeaderName: function getHeaderName(opts) {
        if (headerName) {
            return headerName;
        }

        if (opts.httpHeaderParamName && typeof opts.httpHeaderParamName !== 'string') {
            throw new Error('httpHeaderParamName must be a string');
        }

        headerName = opts.httpHeaderParamName || 'x-correlationid';
        return headerName;
    },
    rebindOnFinished: function rebindOnFinished(correlator, container) {
        if (container.__onFinished) { // eslint-disable-line no-underscore-dangle
            // __onFinished is used by package that are used by koa itself (Application.handleRequest)
            // and morgan to run tasks on response end
            // lib creates 1 field to store all on finish listeners in queue
            container.__onFinished = correlator.bind(container.__onFinished); // eslint-disable-line
        }
    },
};