code review

disk/disk_windows.go

@@ -79,21 +79,10 @@ func UsageWithContext(ctx context.Context, path string) (*UsageStat, error) {
 	return ret, nil
 }
 
-type errorCollector []error
-
-func (c *errorCollector) collect(e error) { *c = append(*c, e) }
-
-func (c *errorCollector) Error() (err string) {
-	err = ""
-	for i, e := range *c {
-		err += fmt.Sprintf("\tError %d: %s\n", i, e.Error())
-	}
-
-	return err
-}
-
 func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, error) {
-	collector := new(errorCollector)
+	warnings := common.Warnings{
+		Verbose: true,
+	}
 	var ret []PartitionStat
 	lpBuffer := make([]byte, 254)
 	diskret, _, err := procGetLogicalDriveStringsW.Call(
@@ -109,7 +98,7 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
 			typeret, _, _ := procGetDriveType.Call(uintptr(unsafe.Pointer(typepath)))
 			if typeret == 0 {
 				err := windows.GetLastError()
-				collector.collect(err)
+				warnings.Add(err)
 				continue
 			}
 			// 2: DRIVE_REMOVABLE 3: DRIVE_FIXED 4: DRIVE_REMOTE 5: DRIVE_CDROM
@@ -134,7 +123,7 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
 					if typeret == 5 || typeret == 2 {
 						continue // device is not ready will happen if there is no disk in the drive
 					}
-					collector.collect(err)
+					warnings.Add(err)
 					continue
 				}
 				opts := []string{"rw"}
@@ -155,11 +144,7 @@ func PartitionsWithContext(ctx context.Context, all bool) ([]PartitionStat, erro
 			}
 		}
 	}
-	if len(*collector) == 0 {
-		return ret, nil
-	} else {
-		return ret, collector
-	}
+	return ret, warnings.Reference()
 }
 
 func IOCountersWithContext(ctx context.Context, names ...string) (map[string]IOCountersStat, error) {

host/host_linux.go

@@ -395,7 +395,7 @@ func SensorsTemperaturesWithContext(ctx context.Context) ([]TemperatureStat, err
 		}
 	}
 
-	var warns Warnings
+	var warns common.Warnings
 
 	if len(files) == 0 { // handle distributions without hwmon, like raspbian #391, parse legacy thermal_zone files
 		files, err = filepath.Glob(common.HostSys("/class/thermal/thermal_zone*/"))

internal/common/warnings.go

@@ -1,11 +1,10 @@
-package host
+package common
 
-import (
-	"fmt"
-)
+import "fmt"
 
 type Warnings struct {
-	List []error
+	List    []error
+	Verbose bool
 }
 
 func (w *Warnings) Add(err error) {
@@ -20,5 +19,12 @@ func (w *Warnings) Reference() error {
 }
 
 func (w *Warnings) Error() string {
+	if w.Verbose {
+		str := ""
+		for i, e := range w.List {
+			str += fmt.Sprintf("\tError %d: %s\n", i, e.Error())
+		}
+		return str
+	}
 	return fmt.Sprintf("Number of warnings: %v", len(w.List))
 }