admin: Add Background heal status info API (#7774)

This API returns the information related to the self healing routine.

For the moment, it returns:
- The total number of objects that are scanned
- The last time when an item was scanned

cmd/peer-rest-client.go

@@ -31,6 +31,7 @@ import (
 	"github.com/minio/minio/cmd/logger"
 	"github.com/minio/minio/cmd/rest"
 	"github.com/minio/minio/pkg/event"
+	"github.com/minio/minio/pkg/madmin"
 	xnet "github.com/minio/minio/pkg/net"
 	"github.com/minio/minio/pkg/policy"
 )
@@ -422,6 +423,18 @@ func (client *peerRESTClient) SignalService(sig serviceSignal) error {
 	return nil
 }
 
+func (client *peerRESTClient) BackgroundHealStatus() (madmin.BgHealState, error) {
+	respBody, err := client.call(peerRESTMethodBackgroundHealStatus, nil, nil, -1)
+	if err != nil {
+		return madmin.BgHealState{}, err
+	}
+	defer http.DrainBody(respBody)
+
+	state := madmin.BgHealState{}
+	err = gob.NewDecoder(respBody).Decode(&state)
+	return state, err
+}
+
 // Trace - send http trace request to peer nodes
 func (client *peerRESTClient) Trace(doneCh chan struct{}, trcAll bool) (chan []byte, error) {
 	ch := make(chan []byte)