service: logging to syslog (#33)

* service: logging to syslog

* chore: update gopsutil to v4

* chore: move println() to the util package

* gpu: only return 0 on failure

pkg/gpu/stat/stat_darwin.go

@@ -30,7 +30,7 @@ func GetGPUStat() (float64, error) {
 	ioreg := exec.Command("ioreg", "-rd1", "-c", "IOAccelerator")
 	gs, err := extractGPUStat(ioreg)
 	if err != nil || len(gs) == 0 {
-		return -1, err
+		return 0, err
 	}
 	return gs[0], nil
 }

pkg/gpu/stat/stat_freebsd.go

@@ -3,5 +3,5 @@
 package stat
 
 func GetGPUStat() (float64, error) {
-	return -1, nil
-}
+	return 0, nil
+}

pkg/gpu/stat/stat_linux.go

@@ -38,7 +38,7 @@ func GetGPUStat() (float64, error) {
 		gs, err = getAMDStat()
 	}
 	if err != nil || len(gs) == 0 {
-		return -1, err
+		return 0, err
 	}
 	return gs[0], nil
 }

pkg/gpu/stat/stat_windows.go

@@ -11,7 +11,7 @@ import (
 func GetGPUStat() (float64, error) {
 	shellPath, err := exec.LookPath("powershell.exe")
 	if err != nil || shellPath == "" {
-		return -1, err
+		return 0, err
 	}
 	cmd := exec.Command(
 		shellPath,
@@ -20,12 +20,12 @@ func GetGPUStat() (float64, error) {
 	)
 	output, err1 := cmd.CombinedOutput()
 	if err1 != nil {
-		return -1, err1
+		return 0, err1
 	}
 	t := strings.TrimSpace(string(output))
 	gs, err2 := strconv.ParseFloat(t, 64)
 	if err2 != nil {
-		return -1, err2
+		return 0, err2
 	}
 	return gs, nil
-}
+}