Add state db apis for block rewards

core/state/statedb.go

@@ -726,3 +726,13 @@ func (db *DB) IsValidator(addr common.Address) bool {
 	}
 	return so.IsValidator(db.db)
 }
+
+func (db *DB) AddReward(validator common.Address, reward *big.Int) {
+	//TODO: implement reward logic
+	// the reward will be distributed to all the delegators based on stake percentage.
+}
+
+func (db *DB) CollectReward(delegator common.Address) {
+	//TODO: implement collect reward logic
+	// The reward will be withdrawn to the delegator's address balance as a whole.
+}

core/vm/interface.go

@@ -45,6 +45,8 @@ type StateDB interface {
 	SetValidatorFlag(common.Address)
 	UnsetValidatorFlag(common.Address)
 	IsValidator(common.Address) bool
+	AddReward(common.Address, *big.Int)
+	CollectReward(common.Address)
 
 	AddRefund(uint64)
 	SubRefund(uint64)