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node_modules/response-time/index.js

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