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