101 lines
2.1 KiB
JavaScript
101 lines
2.1 KiB
JavaScript
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/*!
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* Connect - profiler
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* Copyright(c) 2011 TJ Holowaychuk
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* MIT Licensed
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*/
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/**
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* Profile the duration of a request.
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*
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* Typically this middleware should be utilized
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* _above_ all others, as it proxies the `res.end()`
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* method, being first allows it to encapsulate all
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* other middleware.
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*
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* Example Output:
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*
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* GET /
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* response time 2ms
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* memory rss 52.00kb
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* memory vsize 2.07mb
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* heap before 3.76mb / 8.15mb
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* heap after 3.80mb / 8.15mb
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*
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* @api public
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*/
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module.exports = function profiler(){
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return function(req, res, next){
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var end = res.end
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, start = snapshot();
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// state snapshot
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function snapshot() {
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return {
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mem: process.memoryUsage()
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, time: new Date
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};
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}
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// proxy res.end()
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res.end = function(data, encoding){
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res.end = end;
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res.end(data, encoding);
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compare(req, start, snapshot())
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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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* Compare `start` / `end` snapshots.
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*
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* @param {IncomingRequest} req
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* @param {Object} start
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* @param {Object} end
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* @api private
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*/
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function compare(req, start, end) {
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console.log();
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row(req.method, req.url);
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row('response time:', (end.time - start.time) + 'ms');
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row('memory rss:', formatBytes(end.mem.rss - start.mem.rss));
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row('memory vsize:', formatBytes(end.mem.vsize - start.mem.vsize));
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row('heap before:', formatBytes(start.mem.heapUsed) + ' / ' + formatBytes(start.mem.heapTotal));
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row('heap after:', formatBytes(end.mem.heapUsed) + ' / ' + formatBytes(end.mem.heapTotal));
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console.log();
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}
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/**
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* Row helper
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*
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* @param {String} key
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* @param {String} val
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* @api private
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*/
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function row(key, val) {
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console.log(' \033[90m%s\033[0m \033[36m%s\033[0m', key, val);
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}
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/**
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* Format byte-size.
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*
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* @param {Number} bytes
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* @return {String}
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* @api private
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*/
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function formatBytes(bytes) {
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var kb = 1024
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, mb = 1024 * kb
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, gb = 1024 * mb;
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if (bytes < kb) return bytes + 'b';
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if (bytes < mb) return (bytes / kb).toFixed(2) + 'kb';
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if (bytes < gb) return (bytes / mb).toFixed(2) + 'mb';
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return (bytes / gb).toFixed(2) + 'gb';
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};
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