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'use strict' /** * @callback GenerateRequestId * @param {Object} req * @returns {string} */ /** * @param {string} [requestIdHeader] * @param {GenerateRequestId} [optGenReqId] * @returns {GenerateRequestId} */ function reqIdGenFactory (requestIdHeader, optGenReqId) { const genReqId = optGenReqId || buildDefaultGenReqId() if (requestIdHeader) { return buildOptionalHeaderReqId(requestIdHeader, genReqId) } return genReqId } function getGenReqId (contextServer, req) { return contextServer.genReqId(req) } function buildDefaultGenReqId () { // 2,147,483,647 (2^31 − 1) stands for max SMI value (an internal optimization of V8). // With this upper bound, if you'll be generating 1k ids/sec, you're going to hit it in ~25 days. // This is very likely to happen in real-world applications, hence the limit is enforced. // Growing beyond this value will make the id generation slower and cause a deopt. // In the worst cases, it will become a float, losing accuracy. const maxInt = 2147483647 let nextReqId = 0 return function defaultGenReqId () { nextReqId = (nextReqId + 1) & maxInt return `req-${nextReqId.toString(36)}` } } function buildOptionalHeaderReqId (requestIdHeader, genReqId) { return function (req) { return req.headers[requestIdHeader] || genReqId(req) } } module.exports = { getGenReqId, reqIdGenFactory }