Add HostID to Host

host/host.go

@@ -25,7 +25,7 @@ type InfoStat struct {
 	PlatformVersion      string `json:"platformVersion"`
 	VirtualizationSystem string `json:"virtualizationSystem"`
 	VirtualizationRole   string `json:"virtualizationRole"` // guest or host
-
+	HostID               string `json:"hostid"`             // ex: uuid
 }
 
 type UserStat struct {

host/host_darwin.go

@@ -56,6 +56,11 @@ func Info() (*InfoStat, error) {
 		ret.Procs = uint64(len(procs))
 	}
 
+	values, err := common.DoSysctrl("kern.uuid")
+	if err == nil && len(values) == 1 && values[0] != "" {
+		ret.HostID = values[0]
+	}
+
 	return ret, nil
 }
 

host/host_freebsd.go

@@ -59,6 +59,11 @@ func Info() (*InfoStat, error) {
 		ret.Procs = uint64(len(procs))
 	}
 
+	values, err := common.DoSysctrl("kern.hostuuid")
+	if err == nil && len(values) == 1 && values[0] != "" {
+		ret.HostID = values[0]
+	}
+
 	return ret, nil
 }
 

host/host_linux.go

@@ -61,6 +61,22 @@ func Info() (*InfoStat, error) {
 		ret.Procs = numProcs
 	}
 
+	sysProductUUID := common.HostSys("class/dmi/id/product_uuid")
+	switch {
+	case common.PathExists(sysProductUUID):
+		lines, err := common.ReadLines(sysProductUUID)
+		if err == nil && len(lines) > 0 && lines[0] != "" {
+			ret.HostID = lines[0]
+			break
+		}
+		fallthrough
+	default:
+		values, err := common.DoSysctrl("kernel.random.boot_id")
+		if err == nil && len(values) == 1 && values[0] != "" {
+			ret.HostID = values[0]
+		}
+	}
+
 	return ret, nil
 }
 

host/host_test.go

@@ -66,8 +66,9 @@ func TestHostInfoStat_String(t *testing.T) {
 		OS:       "linux",
 		Platform: "ubuntu",
 		BootTime: 1447040000,
+		HostID:   "edfd25ff-3c9c-b1a4-e660-bd826495ad35",
 	}
-	e := `{"hostname":"test","uptime":3000,"bootTime":1447040000,"procs":100,"os":"linux","platform":"ubuntu","platformFamily":"","platformVersion":"","virtualizationSystem":"","virtualizationRole":""}`
+	e := `{"hostname":"test","uptime":3000,"bootTime":1447040000,"procs":100,"os":"linux","platform":"ubuntu","platformFamily":"","platformVersion":"","virtualizationSystem":"","virtualizationRole":"","hostid":"edfd25ff-3c9c-b1a4-e660-bd826495ad35"}`
 	if e != fmt.Sprintf("%v", v) {
 		t.Errorf("HostInfoStat string is invalid: %v", v)
 	}

internal/common/common.go

@@ -26,7 +26,7 @@ import (
 
 var (
 	Timeout    = 3 * time.Second
-	TimeoutErr = errors.New("Command timed out.")
+	ErrTimeout = errors.New("Command timed out.")
 )
 
 type Invoker interface {
@@ -338,6 +338,6 @@ func WaitTimeout(c *exec.Cmd, timeout time.Duration) error {
 		}
 		// wait for the command to return after killing it
 		<-done
-		return TimeoutErr
+		return ErrTimeout
 	}
 }

internal/common/common_linux.go

@@ -2,7 +2,31 @@
 
 package common
 
-import "os"
+import (
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func DoSysctrl(mib string) ([]string, error) {
+	err := os.Setenv("LC_ALL", "C")
+	if err != nil {
+		return []string{}, err
+	}
+	sysctl, err := exec.LookPath("/sbin/sysctl")
+	if err != nil {
+		return []string{}, err
+	}
+	out, err := exec.Command(sysctl, "-n", mib).Output()
+	if err != nil {
+		return []string{}, err
+	}
+	v := strings.Replace(string(out), "{ ", "", 1)
+	v = strings.Replace(string(v), " }", "", 1)
+	values := strings.Fields(string(v))
+
+	return values, nil
+}
 
 func NumProcs() (uint64, error) {
 	f, err := os.Open(HostProc())