// InjectTxn adds a coin.Transaction to the pool, or updates an existing one's timestamps
// Returns an error if txn is invalid, and whether the transaction already
// existed in the pool.
func (utp *UnconfirmedTxnPool) InjectTxn(bc *Blockchain,
t coin.Transaction) (error, bool) {
if err := t.Verify(); err != nil {
return err, false
}
if err := VerifyTransactionFee(bc, &t); err != nil {
return err, false
}
if err := bc.VerifyTransaction(t); err != nil {
return err, false
}
// Update if we already have this txn
h := t.Hash()
ut, ok := utp.Txns[h]
if ok {
now := util.Now()
ut.Received = now
ut.Checked = now
utp.Txns[h] = ut
return nil, true
}
// Add txn to index
unspent := bc.GetUnspent()
utp.Txns[h] = utp.createUnconfirmedTxn(unspent, t)
// Add predicted unspents
utp.Unspent[h] = coin.CreateUnspents(bc.Head().Head, t)
return nil, false
}
func InitTransaction() coin.Transaction {
var tx coin.Transaction
output := cipher.MustSHA256FromHex("043836eb6f29aaeb8b9bfce847e07c159c72b25ae17d291f32125e7f1912e2a0")
tx.PushInput(output)
for i := 0; i < 100; i++ {
addr := cipher.MustDecodeBase58Address(AddrList[i])
tx.PushOutput(addr, 1e12, 1) // 10e6*10e6
}
/*
seckeys := make([]cipher.SecKey, 1)
seckey := ""
seckeys[0] = cipher.MustSecKeyFromHex(seckey)
tx.SignInputs(seckeys)
*/
txs := make([]cipher.Sig, 1)
sig := "ed9bd7a31fe30b9e2d53b35154233dfdf48aaaceb694a07142f84cdf4f5263d21b723f631817ae1c1f735bea13f0ff2a816e24a53ccb92afae685fdfc06724de01"
txs[0] = cipher.MustSigFromHex(sig)
tx.Sigs = txs
tx.UpdateHeader()
err := tx.Verify()
if err != nil {
log.Panic(err)
}
log.Printf("signature= %s", tx.Sigs[0].Hex())
return tx
}
func makeTransactionForChainWithHoursFee(t *testing.T, bc *Blockchain,
ux coin.UxOut, sec cipher.SecKey, hours, fee uint64) (coin.Transaction, cipher.SecKey) {
chrs := ux.CoinHours(bc.Time())
if chrs < hours+fee {
log.Panicf("CoinHours underflow. Have %d, need at least %d", chrs,
hours+fee)
}
assert.Equal(t, cipher.AddressFromPubKey(cipher.PubKeyFromSecKey(sec)), ux.Body.Address)
knownUx, exists := bc.GetUnspent().Get(ux.Hash())
assert.True(t, exists)
assert.Equal(t, knownUx, ux)
tx := coin.Transaction{}
tx.PushInput(ux.Hash())
p, newSec := cipher.GenerateKeyPair()
addr := cipher.AddressFromPubKey(p)
tx.PushOutput(addr, 1e6, hours)
coinsOut := ux.Body.Coins - 1e6
if coinsOut > 0 {
tx.PushOutput(genAddress, coinsOut, chrs-hours-fee)
}
tx.SignInputs([]cipher.SecKey{sec})
assert.Equal(t, len(tx.Sigs), 1)
assert.Nil(t, cipher.ChkSig(ux.Body.Address, cipher.AddSHA256(tx.HashInner(), tx.In[0]), tx.Sigs[0]))
tx.UpdateHeader()
assert.Nil(t, tx.Verify())
err := bc.VerifyTransaction(tx)
assert.Nil(t, err)
return tx, newSec
}
// VerifyTransaction checks that the inputs to the transaction exist,
// that the transaction does not create or destroy coins and that the
// signatures on the transaction are valid
func (bc Blockchain) VerifyTransaction(tx coin.Transaction) error {
//CHECKLIST: DONE: check for duplicate ux inputs/double spending
//CHECKLIST: DONE: check that inputs of transaction have not been spent
//CHECKLIST: DONE: check there are no duplicate outputs
// Q: why are coin hours based on last block time and not
// current time?
// A: no two computers will agree on system time. Need system clock
// indepedent timing that everyone agrees on. fee values would depend on
// local clock
// Check transaction type and length
// Check for duplicate outputs
// Check for duplicate inputs
// Check for invalid hash
// Check for no inputs
// Check for no outputs
// Check for non 1e6 multiple coin outputs
// Check for zero coin outputs
// Check valid looking signatures
if err := tx.Verify(); err != nil {
return err
}
uxIn, err := bc.unspent.GetMultiple(tx.In)
if err != nil {
return err
}
// Checks whether ux inputs exist,
// Check that signatures are allowed to spend inputs
if err := tx.VerifyInput(uxIn); err != nil {
return err
}
// Get the UxOuts we expect to have when the block is created.
uxOut := coin.CreateUnspents(bc.Head().Head, tx)
// Check that there are any duplicates within this set
if uxOut.HasDupes() {
return errors.New("Duplicate unspent outputs in transaction")
}
if DebugLevel1 {
// Check that new unspents don't collide with existing. This should
// also be checked in verifyTransactions
for i := range uxOut {
if bc.unspent.Has(uxOut[i].Hash()) {
return errors.New("New unspent collides with existing unspent")
}
}
}
// Check that no coins are lost, and sufficient coins and hours are spent
err = coin.VerifyTransactionSpending(bc.Time(), uxIn, uxOut)
if err != nil {
return err
}
return nil
}
//move into visor
//DEPRECATE
func (self *Visor) InjectTransaction(txn coin.Transaction, pool *Pool) (coin.Transaction, error) {
err := txn.Verify()
if err != nil {
return txn, errors.New("Transaction Verification Failed")
}
err, _ = self.Visor.InjectTxn(txn)
if err == nil {
self.BroadcastTransaction(txn, pool)
}
return txn, err
}
//move into visor
//DEPRECATE
func (self *Visor) InjectTransaction(txn coin.Transaction, pool *Pool) (coin.Transaction, error) {
if err := visor.VerifyTransactionFee(self.Visor.Blockchain, &txn); err != nil {
return txn, err
}
if err := txn.Verify(); err != nil {
return txn, fmt.Errorf("Transaction Verification Failed, %v", err)
}
err, _ := self.Visor.InjectTxn(txn)
if err == nil {
self.BroadcastTransaction(txn, pool)
}
return txn, err
}
func makeMultipleOutputs(t *testing.T, bc *Blockchain) {
txn := coin.Transaction{}
ux := bc.GetUnspent().Array()[0]
txn.PushInput(ux.Hash())
txn.PushOutput(genAddress, 1e6, 100)
txn.PushOutput(genAddress, 2e6, 100)
txn.PushOutput(genAddress, _genCoins-3e6, 100)
txn.SignInputs([]cipher.SecKey{genSecret})
txn.UpdateHeader()
assert.Nil(t, txn.Verify())
assert.Nil(t, bc.VerifyTransaction(txn))
b, err := bc.NewBlockFromTransactions(coin.Transactions{txn},
bc.Time()+_incTime)
assert.Nil(t, err)
assertExecuteBlock(t, bc, b, txn)
}
func TransactionToJSON(tx coin.Transaction) string {
var o TransactionJSON
if err := tx.Verify(); err != nil {
log.Panic("Input Transaction Invalid: Cannot serialize to JSON, fails verify")
}
o.Hash = tx.Hash().Hex()
o.InnerHash = tx.InnerHash.Hex()
if tx.InnerHash != tx.HashInner() {
log.Panic("TransactionToJSON called with invalid transaction, inner hash mising")
}
o.Sigs = make([]string, len(tx.Sigs))
o.In = make([]string, len(tx.In))
o.Out = make([]TransactionOutputJSON, len(tx.Out))
for i, sig := range tx.Sigs {
o.Sigs[i] = sig.Hex()
}
for i, x := range tx.In {
o.In[i] = x.Hex() //hash to hex
}
for i, y := range tx.Out {
o.Out[i] = NewTransactionOutputJSON(y, tx.InnerHash)
}
b, err := json.MarshalIndent(o, "", " ")
if err != nil {
log.Panic("Cannot serialize transaction as JSON")
}
return string(b)
}
func TransactionFromJSON(str string) (coin.Transaction, error) {
var TxIn TransactionJSON
err := json.Unmarshal([]byte(str), TxIn)
if err != nil {
errors.New("cannot deserialize")
}
var tx coin.Transaction
tx.Sigs = make([]cipher.Sig, len(TxIn.Sigs))
tx.In = make([]cipher.SHA256, len(TxIn.In))
tx.Out = make([]coin.TransactionOutput, len(TxIn.Out))
for i, _ := range tx.Sigs {
sig2, err := cipher.SigFromHex(TxIn.Sigs[i])
if err != nil {
return coin.Transaction{}, errors.New("invalid signature")
}
tx.Sigs[i] = sig2
}
for i, _ := range tx.In {
hash, err := cipher.SHA256FromHex(TxIn.In[i])
if err != nil {
return coin.Transaction{}, errors.New("invalid signature")
}
tx.In[i] = hash
}
for i, _ := range tx.Out {
out, err := TransactionOutputFromJSON(TxIn.Out[i])
if err != nil {
return coin.Transaction{}, errors.New("invalid output")
}
tx.Out[i] = out
}
tx.Length = uint32(tx.Size())
tx.Type = 0
hash, err := cipher.SHA256FromHex(TxIn.Hash)
if err != nil {
return coin.Transaction{}, errors.New("invalid hash")
}
if hash != tx.Hash() {
}
InnerHash, err := cipher.SHA256FromHex(TxIn.Hash)
if InnerHash != tx.InnerHash {
return coin.Transaction{}, errors.New("inner hash")
}
err = tx.Verify()
if err != nil {
return coin.Transaction{}, errors.New("transaction failed verification")
}
return tx, nil
}