98 lines
1.8 KiB
JavaScript
98 lines
1.8 KiB
JavaScript
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/*!
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* response-time
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* Copyright(c) 2011 TJ Holowaychuk
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* Copyright(c) 2014 Jonathan Ong
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* Copyright(c) 2014-2015 Douglas Christopher Wilson
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* MIT Licensed
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*/
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'use strict'
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/**
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* Module dependencies
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* @api private
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*/
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var deprecate = require('depd')('response-time')
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var onHeaders = require('on-headers')
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/**
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* Module exports
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*/
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module.exports = responseTime
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/**
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* Reponse time:
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*
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* Adds the `X-Response-Time` header displaying the response
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* duration in milliseconds.
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*
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* @param {object} [options]
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* @param {number} [options.digits=3]
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* @return {function}
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* @api public
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*/
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function responseTime (options) {
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var opts = options || {}
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if (typeof options === 'number') {
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// back-compat single number argument
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deprecate('number argument: use {digits: ' + JSON.stringify(options) + '} instead')
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opts = { digits: options }
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}
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// get the function to invoke
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var fn = typeof opts !== 'function'
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? createSetHeader(opts)
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: opts
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return function responseTime (req, res, next) {
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var startAt = process.hrtime()
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onHeaders(res, function onHeaders () {
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var diff = process.hrtime(startAt)
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var time = diff[0] * 1e3 + diff[1] * 1e-6
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fn(req, res, time)
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})
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next()
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}
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}
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/**
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* Create function to set respoonse time header.
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* @api private
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*/
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function createSetHeader (options) {
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// response time digits
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var digits = options.digits !== undefined
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? options.digits
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: 3
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// header name
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var header = options.header || 'X-Response-Time'
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// display suffix
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var suffix = options.suffix !== undefined
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? Boolean(options.suffix)
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: true
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return function setResponseHeader (req, res, time) {
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if (res.getHeader(header)) {
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return
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}
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var val = time.toFixed(digits)
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if (suffix) {
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val += 'ms'
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}
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res.setHeader(header, val)
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}
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}
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