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get free port in golang
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| // GetFreePort asks the kernel for a free open port that is ready to use. | |
| func GetFreePort() (port int, err error) { | |
| var a *net.TCPAddr | |
| if a, err = net.ResolveTCPAddr("tcp", "localhost:0"); err == nil { | |
| var l *net.TCPListener | |
| if l, err = net.ListenTCP("tcp", a); err == nil { | |
| defer l.Close() | |
| return l.Addr().(*net.TCPAddr).Port, nil | |
| } | |
| } | |
| return | |
| } |
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