我想获得价值TTFB和连接价值
c := exec.Command(
"curl", "-w",
"Connect: %{time_connect} TTFB: %{time_starttransfer} Total time: %{time_total}",
"-o",
"/dev/null",
"http://my.domain/favicon.ico")
cID, err := c.Run()
fmt.Printf("%s", cID)
它打印出像
这样的刺痛Connect: 0.205 TTFB: 0.353 Total time: 0.354
但是,我只需要golang变量中TTFB , Connect, Total time
值的值。
另外,有没有办法在不专门使用curl的情况下获取值?
答案 0 :(得分:10)
自Go 1.7以来,内置了对此的支持。 Go 1.7添加了HTTP跟踪,阅读博文:Introducing HTTP Tracing
您可以指定在发出HTTP(S)请求时在适当的阶段/点调用的回调函数。您可以通过创建值httptrace.ClientTrace
和" arm"来指定回调函数。它使用httptrace.WithClientTrace()
。
这是一个获取URL参数的示例函数,并打印获取它的时间:
func timeGet(url string) {
req, _ := http.NewRequest("GET", url, nil)
var start, connect, dns, tlsHandshake time.Time
trace := &httptrace.ClientTrace{
DNSStart: func(dsi httptrace.DNSStartInfo) { dns = time.Now() },
DNSDone: func(ddi httptrace.DNSDoneInfo) {
fmt.Printf("DNS Done: %v\n", time.Since(dns))
},
TLSHandshakeStart: func() { tlsHandshake = time.Now() },
TLSHandshakeDone: func(cs tls.ConnectionState, err error) {
fmt.Printf("TLS Handshake: %v\n", time.Since(tlsHandshake))
},
ConnectStart: func(network, addr string) { connect = time.Now() },
ConnectDone: func(network, addr string, err error) {
fmt.Printf("Connect time: %v\n", time.Since(connect))
},
GotFirstResponseByte: func() {
fmt.Printf("Time from start to first byte: %v\n", time.Since(start))
},
}
req = req.WithContext(httptrace.WithClientTrace(req.Context(), trace))
start = time.Now()
if _, err := http.DefaultTransport.RoundTrip(req); err != nil {
log.Fatal(err)
}
fmt.Printf("Total time: %v\n", time.Since(start))
}
调用它的示例:
timeGet("https://google.com")
示例输出:
DNS Done: 7.998465ms
Connect time: 12.677085ms
TLS Handshake: 128.65394ms
Time from start to first byte: 176.461087ms
Total time: 176.723402ms
另外请务必查看github.com/davecheney/httpstat,它为您提供了一个CLI实用程序,该实用程序也使用了httptracing
软件包。