[validator] Turn int into string in JSON representation (#2454)

staking/effective/eligible.go

@@ -20,3 +20,16 @@ const (
 	// it can never be undone
 	Banned
 )
+
+func (e Eligibility) String() string {
+	switch e {
+	case Active:
+		return "active"
+	case Inactive:
+		return "inactive"
+	case Banned:
+		return "banned"
+	default:
+		return "nil"
+	}
+}

staking/types/validator.go

@@ -109,11 +109,13 @@ func (w ValidatorWrapper) MarshalJSON() ([]byte, error) {
 	return json.Marshal(struct {
 		Validator
 		Address     string      `json:"address"`
+		EPOSStatus  string      `json:"epos-eligibility-status"`
 		Delegations Delegations `json:"delegations"`
 		Counters    counters    `json:"availability"`
 	}{
 		w.Validator,
 		common2.MustAddressToBech32(w.Address),
+		w.EPOSStatus.String(),
 		w.Delegations,
 		w.Counters,
 	})