// Returns an error message about what is wrong with the transaction if it is
// invalid, otherwise you are good to go.
func (fs *FactoidState) Validate(index int, trans interfaces.ITransaction) error {
var sums = make(map[[32]byte]uint64, 10) // Look at the sum of an address's inputs
for _, input := range trans.GetInputs() { // to a transaction.
bal, err := factoid.ValidateAmounts(sums[input.GetAddress().Fixed()], input.GetAmount())
if err != nil {
return err
}
if int64(bal) > fs.State.GetF(true, input.GetAddress().Fixed()) {
return fmt.Errorf("%s", "Not enough funds in input addresses for the transaction")
}
sums[input.GetAddress().Fixed()] = bal
}
return nil
}
// Assumes validation has already been done.
func (fs *FactoidState) UpdateTransaction(rt bool, trans interfaces.ITransaction) error {
for _, input := range trans.GetInputs() {
adr := input.GetAddress().Fixed()
oldv := fs.State.GetF(rt, adr)
fs.State.PutF(rt, adr, oldv-int64(input.GetAmount()))
}
for _, output := range trans.GetOutputs() {
adr := output.GetAddress().Fixed()
oldv := fs.State.GetF(rt, adr)
fs.State.PutF(rt, adr, oldv+int64(output.GetAmount()))
}
for _, ecOut := range trans.GetECOutputs() {
ecbal := int64(ecOut.GetAmount()) / int64(fs.State.FactoshisPerEC)
fs.State.PutE(rt, ecOut.GetAddress().Fixed(), fs.State.GetE(rt, ecOut.GetAddress().Fixed())+ecbal)
}
fs.State.NumTransactions++
return nil
}
// Add the first transaction of a block. This transaction makes the
// payout to the servers, so it has no inputs. This transaction must
// be deterministic so that all servers will know and expect its output.
func (b *FBlock) AddCoinbase(trans interfaces.ITransaction) error {
b.BodyMR = nil
if len(b.Transactions) != 0 {
return fmt.Errorf("The coinbase transaction must be the first transaction")
}
if len(trans.GetInputs()) != 0 {
return fmt.Errorf("The coinbase transaction cannot have any inputs")
}
if len(trans.GetECOutputs()) != 0 {
return fmt.Errorf("The coinbase transaction cannot buy Entry Credits")
}
if len(trans.GetRCDs()) != 0 {
return fmt.Errorf("The coinbase transaction cannot have anyRCD blocks")
}
if len(trans.GetSignatureBlocks()) != 0 {
return fmt.Errorf("The coinbase transaction is not signed")
}
// TODO Add check here for the proper payouts.
b.Transactions = append(b.Transactions, trans)
return nil
}
func (w *SCWallet) SignInputs(trans interfaces.ITransaction) (bool, error) {
data, err := trans.MarshalBinarySig() // Get the part of the transaction we sign
if err != nil {
return false, err
}
var numSigs int = 0
inputs := trans.GetInputs()
rcds := trans.GetRCDs()
for i, rcd := range rcds {
rcd1, ok := rcd.(*RCD_1)
if ok {
pub := rcd1.GetPublicKey()
wex, err := w.db.Get([]byte(constants.W_ADDRESS_PUB_KEY), pub, new(WalletEntry))
if err != nil {
return false, err
}
we := wex.(*WalletEntry)
if we != nil {
var pri [constants.SIGNATURE_LENGTH]byte
copy(pri[:], we.private[0])
bsig := ed25519.Sign(&pri, data)
sig := new(FactoidSignature)
sig.SetSignature(bsig[:])
sigblk := new(SignatureBlock)
sigblk.AddSignature(sig)
trans.SetSignatureBlock(i, sigblk)
numSigs += 1
}
}
}
return numSigs == len(inputs), nil
}
