heal: Simplify bucket healing status (#5079)

Avoid using the drive count concept to pick a color for a bucket healing
result. This was straightforward when we were healing a bucket per erasure 
set, but now it becomes more complex to show a result.

Pick green if everything is okay, yellow if a bucket is missing in a
drive, red for any other drive state (unformatted, offline, ..), and
grey for any weird situation.

cmd/admin-heal-result-item.go

@@ -18,6 +18,7 @@
 package cmd
 
 import (
+	"errors"
 	"fmt"
 
 	"github.com/minio/madmin-go/v3"
@@ -55,6 +56,46 @@ func (h hri) getObjectHCCChange() (b, a col, err error) {
 	return
 }
 
+// getBucketHCCChange - fetches health color code for bucket healing
+// this does not return a Grey color since it does not have any meaning
+// for a bucket healing. Return green if the bucket is found in a drive,
+// yellow for missing, and red for everything else, grey for weird situations
+func (h hri) getBucketHCCChange() (b, a col, err error) {
+	if h.HealResultItem == nil {
+		return colGrey, colGrey, errors.New("empty result")
+	}
+
+	getColCode := func(drives []madmin.HealDriveInfo) (c col) {
+		var missing, unavailable int
+		for i := range drives {
+			switch drives[i].State {
+			case madmin.DriveStateOk:
+			case madmin.DriveStateMissing:
+				missing++
+			default:
+				unavailable++
+			}
+		}
+		if unavailable > 0 {
+			return colRed
+		}
+		if missing > 0 {
+			return colYellow
+		}
+		return colGreen
+	}
+
+	a, b = colGrey, colGrey
+
+	if len(h.HealResultItem.Before.Drives) > 0 {
+		b = getColCode(h.HealResultItem.Before.Drives)
+	}
+	if len(h.HealResultItem.After.Drives) > 0 {
+		a = getColCode(h.HealResultItem.After.Drives)
+	}
+	return
+}
+
 // getReplicatedFileHCCChange - fetches health color code for metadata
 // files that are replicated.
 func (h hri) getReplicatedFileHCCChange() (b, a col, err error) {

cmd/admin-heal-ui.go

@@ -127,7 +127,9 @@ func (ui *uiData) updateStats(i madmin.HealResultItem) error {
 	var afterCol col
 	h := newHRI(&i)
 	switch h.Type {
-	case madmin.HealItemMetadata, madmin.HealItemBucket:
+	case madmin.HealItemBucket:
+		_, afterCol, err = h.getBucketHCCChange()
+	case madmin.HealItemMetadata, madmin.HealItemBucketMetadata:
 		_, afterCol, err = h.getReplicatedFileHCCChange()
 	default:
 		_, afterCol, err = h.getObjectHCCChange()
@@ -206,7 +208,9 @@ func (ui *uiData) printItemsQuietly(s *madmin.HealTaskStatus) (err error) {
 	for _, item := range s.Items {
 		h := newHRI(&item)
 		switch h.Type {
-		case madmin.HealItemMetadata, madmin.HealItemBucket:
+		case madmin.HealItemBucket:
+			b, a, err = h.getBucketHCCChange()
+		case madmin.HealItemMetadata, madmin.HealItemBucketMetadata:
 			b, a, err = h.getReplicatedFileHCCChange()
 		default:
 			b, a, err = h.getObjectHCCChange()
@@ -267,7 +271,9 @@ func (ui *uiData) printItemsJSON(s *madmin.HealTaskStatus) (err error) {
 		var b, a col
 		var err error
 		switch h.Type {
-		case madmin.HealItemMetadata, madmin.HealItemBucket:
+		case madmin.HealItemBucket:
+			b, a, err = h.getBucketHCCChange()
+		case madmin.HealItemMetadata, madmin.HealItemBucketMetadata:
 			b, a, err = h.getReplicatedFileHCCChange()
 		default:
 			if h.Type == madmin.HealItemObject {