nodejs请求库，获取响应时间
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nodejs request library, get the response time
提问by David Portabella
Using the nodejs requestlibrary: https://github.com/mikeal/request
使用 nodejsrequest库：https: //github.com/mikeal/request
var request = require('request');
request('http://example.com', function (error, response, body) {
...
})
Is it possible to get the response time on the callback? The doc mentions response.statusCode. looking at the library source code I also see undocumented response.headers and response.href, but I don't see responseTime or similar.
是否有可能获得回调的响应时间？该文档提到了 response.statusCode。查看库源代码，我还看到未记录的 response.headers 和 response.href，但我没有看到 responseTime 或类似内容。
or, is there an alternative library to requestthat provides the response time?
或者，是否有request提供响应时间的替代库？
ps: I know I could do something like this, but that's not a solution, as I am making many async requests and I cannot control when each request will be started.
ps：我知道我可以做这样的事情，但这不是解决方案，因为我发出了许多异步请求，而且我无法控制每个请求何时开始。
var request = require('request');
var start = new Date();
request('http://example.com', function (error, response, body) {
...
var responseTime = new Date() - start;
})
回答by James Skinner
The request library can do timing for you (docs):
请求库可以为您计时（文档）：
request.get({
url : 'http://example.com',
time : true
},function(err, response){
console.log('Request time in ms', response.elapsedTime);
});
As the question implies, you could get issues with the approach of starting a timer, calling requestthen stopping the timer in the callback:
正如问题所暗示的那样，您可能会遇到启动计时器、request在回调中调用然后停止计时器的方法的问题：
var start = new Date();
request.get('http://example.com', function(err, response){
// NOT GOOD
console.log('Request time plus 5 seconds', new Date() - start);
});
require('sleep').sleep(5); // time-consuming synchronous action
回答by Aaron Dufour
Something like
就像是
var timedReq = function(url, next) {
var start = new Date();
request(url, function(err, res, body) {
res.responseTime = new Date() - start;
next(err, res, body);
});
};
will do it for you. This seems small enough that it's probably easier than finding a new library.
会为你做的。这看起来足够小，可能比找到一个新库更容易。
回答by Alexandru Savin
Instead of using Date() you could also use process.hrtime. I have a library specifically for these kind of cases that uses hrtime. The library name is exectimer.
除了使用 Date()，您还可以使用 process.hrtime。我有一个专门用于使用 hrtime 的情况的库。库名称是exectimer。
You could use it like this:
你可以这样使用它：
var timedReq = function(url, next) {
var tick = new t.Tick("responseTime");
tick.start();
request(url, function(err, res, body) {
tick.stop();
next(err, res, body);
});
};
// when ready check the results with this:
var responseTime = t.timers.responseTime;
console.log(responseTime.min()); // minimal response time
console.log(responseTime.max()); // minimal response time
console.log(responseTime.mean()); // mean response time
console.log(responseTime.median()); // median response time
