package main import ( "crypto/md5" "os" ) var global struct { hostname string machineId []byte pid int requestCounter uint32 } func init() { global.pid = os.Getpid() var err error global.hostname, err = os.Hostname() if err != nil { panic("failed to get hostname: " + err.Error()) } hw := md5.New() if _, err := hw.Write([]byte(global.hostname)); err != nil { panic("unable to md5 hostname: " + err.Error()) } global.machineId = make([]byte, 3) copy(global.machineId, hw.Sum(nil)) }