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validator.go
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validator.go
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package ledger
import (
"github.com/msaldanha/realChain/errors"
"github.com/msaldanha/realChain/keyvaluestore"
)
const (
ErrInvalidTransactionType = errors.Error("invalid transaction type")
ErrInvalidTransactionTimestamp = errors.Error("invalid transaction timestamp")
ErrTransactionAddressCantBeEmpty = errors.Error("transaction address can not be empty")
ErrPreviousTransactionCantBeEmpty = errors.Error("previous transaction can not be empty")
ErrTransactionSignatureCantBeEmpty = errors.Error("transaction signature can not be empty")
ErrTransactionPowNonceCantBeZero = errors.Error("transaction PoW nonce can not be zero")
ErrTransactionHashCantBeEmpty = errors.Error("transaction hash can not be empty")
ErrTransactionLinkCantBeEmpty = errors.Error("transaction link can not be empty")
ErrDestinationNotFound = errors.Error("destination not found")
ErrSourceNotFound = errors.Error("source not found")
ErrInvalidSourceType = errors.Error("invalid source type")
ErrPubKeyCantBeEmpty = errors.Error("transaction public key can not be empty")
)
type Validator interface {
IsFilled(tx *Transaction) (bool, error)
IsValid(tx *Transaction) (bool, error)
}
type ValidatorCreator interface {
CreateValidatorForTransaction(txType Transaction_Type, store keyvaluestore.Storer) Validator
}
type validatorCreator struct {
}
type BaseValidator struct {
store keyvaluestore.Storer
}
type OpenValidator struct {
BaseValidator
}
type SendValidator struct {
BaseValidator
}
type ReceiveValidator struct {
BaseValidator
}
type ChangeValidator struct {
BaseValidator
}
func NewValidatorCreator() ValidatorCreator {
return &validatorCreator{}
}
func (*validatorCreator) CreateValidatorForTransaction(txType Transaction_Type, store keyvaluestore.Storer) (Validator) {
switch txType {
case Transaction_OPEN:
return &OpenValidator{BaseValidator{store}}
case Transaction_SEND:
return &SendValidator{BaseValidator{store}}
case Transaction_RECEIVE:
return &ReceiveValidator{BaseValidator{store}}
case Transaction_CHANGE:
return &ChangeValidator{BaseValidator{store}}
default:
return &BaseValidator{store}
}
}
func (v *BaseValidator) IsValid(tx *Transaction) (bool, error) {
return v.IsFilled(tx)
}
func (v *BaseValidator) IsFilled(tx *Transaction) (bool, error) {
if tx.Type < Transaction_OPEN || tx.Type > Transaction_CHANGE {
return false, ErrInvalidTransactionType
}
if tx.Timestamp <= 0 {
return false, ErrInvalidTransactionTimestamp
}
if len(tx.Address) == 0 {
return false, ErrTransactionAddressCantBeEmpty
}
if len(tx.Previous) == 0 && !v.store.IsEmpty() && tx.Type != Transaction_OPEN {
return false, ErrPreviousTransactionCantBeEmpty
}
if len(tx.Signature) == 0 {
return false, ErrTransactionSignatureCantBeEmpty
}
if tx.PowNonce == 0 {
return false, ErrTransactionPowNonceCantBeZero
}
if len(tx.Hash) == 0 {
return false, ErrTransactionHashCantBeEmpty
}
if len(tx.PubKey) == 0 {
return false, ErrPubKeyCantBeEmpty
}
return true, nil
}
func (v *OpenValidator) IsFilled(tx *Transaction) (bool, error) {
if tx.Type != Transaction_OPEN {
return false, ErrInvalidTransactionType
}
if ok, err := v.BaseValidator.IsFilled(tx); !ok {
return ok, err
}
if len(tx.Link) == 0 && !v.store.IsEmpty() {
return false, ErrTransactionLinkCantBeEmpty
}
if len(tx.Signature) == 0 {
return false, ErrTransactionSignatureCantBeEmpty
}
if tx.PowNonce == 0 {
return false, ErrTransactionPowNonceCantBeZero
}
return true, nil
}
func (v *OpenValidator) IsValid(tx *Transaction) (bool, error) {
if ok, err := v.IsFilled(tx); !ok {
return ok, err
}
return v.BaseValidator.IsValid(tx)
}
func (v *SendValidator) IsFilled(tx *Transaction) (bool, error) {
if tx.Type != Transaction_SEND {
return false, ErrInvalidTransactionType
}
if ok, err := v.BaseValidator.IsFilled(tx); !ok {
return ok, err
}
if len(tx.Link) == 0 {
return false, ErrTransactionLinkCantBeEmpty
}
return v.BaseValidator.IsFilled(tx)
}
func (v *SendValidator) IsValid(tx *Transaction) (bool, error) {
if ok, err := v.IsFilled(tx); !ok {
return ok, err
}
return v.BaseValidator.IsValid(tx)
}
func (v *SendValidator) HasValidDestination(tx *Transaction) (bool, error) {
_, found, err := v.store.Get(string(tx.Link))
if err != nil {
return false, err
}
if !found {
return false, ErrDestinationNotFound
}
return found, err
}
func (v *ReceiveValidator) IsFilled(tx *Transaction) (bool, error) {
if tx.Type != Transaction_RECEIVE {
return false, ErrInvalidTransactionType
}
if ok, err := v.BaseValidator.IsFilled(tx); !ok {
return ok, err
}
if len(tx.Link) == 0 {
return false, ErrTransactionLinkCantBeEmpty
}
return v.BaseValidator.IsFilled(tx)
}
func (v *ReceiveValidator) IsValid(tx *Transaction) (bool, error) {
if ok, err := v.IsFilled(tx); !ok {
return ok, err
}
if ok, err := v.HasValidSource(tx); !ok {
return ok, err
}
return v.BaseValidator.IsValid(tx)
}
func (v *ReceiveValidator) HasValidSource(tx *Transaction) (bool, error) {
dest, found, err := v.store.Get(string(tx.Link))
if err != nil {
return false, err
}
if !found {
return false, ErrSourceNotFound
}
source := NewTransactionFromBytes(dest)
if source.Type != Transaction_SEND {
return false, ErrInvalidSourceType
}
return true, nil
}
func (v *ChangeValidator) IsFilled(tx *Transaction) (bool, error) {
if tx.Type != Transaction_CHANGE {
return false, ErrInvalidTransactionType
}
if ok, err := v.BaseValidator.IsFilled(tx); !ok {
return ok, err
}
return v.BaseValidator.IsFilled(tx)
}
func (v *ChangeValidator) IsValid(tx *Transaction) (bool, error) {
if ok, err := v.IsFilled(tx); !ok {
return ok, err
}
return v.BaseValidator.IsValid(tx)
}