// 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 (fg fakeGateway) InjectTransaction(txn coin.Transaction) (coin.Transaction, error) {
if _, v := fg.injectRawTxMap[txn.Hash().Hex()]; v {
return txn, nil
}
return txn, errors.New("inject transaction failed")
}
func NewReadableTransaction(t *coin.Transaction) ReadableTransaction {
sigs := make([]string, len(t.Sigs))
for i, _ := range t.Sigs {
sigs[i] = t.Sigs[i].Hex()
}
in := make([]string, len(t.In))
for i, _ := range t.In {
in[i] = t.In[i].Hex()
}
out := make([]ReadableTransactionOutput, len(t.Out))
for i, _ := range t.Out {
out[i] = NewReadableTransactionOutput(&t.Out[i])
}
return ReadableTransaction{
Length: t.Length,
Type: t.Type,
Hash: t.Hash().Hex(),
InnerHash: t.InnerHash.Hex(),
Sigs: sigs,
In: in,
Out: out,
}
}
// 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 (self *UnconfirmedTxnPool) RecordTxn(bc *coin.Blockchain,
t coin.Transaction, addrs map[coin.Address]byte, maxSize int,
burnFactor uint64) (error, bool) {
if err := VerifyTransaction(bc, &t, maxSize, burnFactor); err != nil {
return err, false
}
if err := bc.VerifyTransaction(t); err != nil {
return err, false
}
// Update if we already have this txn
ut, ok := self.Txns[t.Hash()]
if ok {
now := util.Now()
ut.Received = now
ut.Checked = now
self.Txns[ut.Txn.Hash()] = ut
return nil, true
}
// Add txn to index
self.Txns[t.Hash()] = self.createUnconfirmedTxn(&bc.Unspent, t, addrs)
// Add predicted unspents
uxs := coin.CreateExpectedUnspents(t)
for i, _ := range uxs {
self.Unspent.Add(uxs[i])
}
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
}
// 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 (self *UnconfirmedTxnPool) RecordTxn(bc *coin.Blockchain,
t coin.Transaction, addrs map[cipher.Address]byte, maxSize int,
burnFactor uint64) (error, bool) {
if err := VerifyTransaction(bc, &t, maxSize, burnFactor); 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 := self.Txns[h]
if ok {
now := util.Now()
ut.Received = now
ut.Checked = now
self.Txns[h] = ut
return nil, true
}
// Add txn to index
self.Txns[h] = self.createUnconfirmedTxn(&bc.Unspent, t, addrs)
// Add predicted unspents
self.Unspent[h] = coin.CreateUnspents(bc.Head().Head, t)
return nil, false
}
func (fbc *fakeBlockchain) CreateGenesisBlock(genesisAddr cipher.Address, genesisCoins, timestamp uint64) coin.Block {
txn := coin.Transaction{}
txn.PushOutput(genesisAddr, genesisCoins, genesisCoins)
body := coin.BlockBody{coin.Transactions{txn}}
prevHash := cipher.SHA256{}
head := coin.BlockHeader{
Time: timestamp,
BodyHash: body.Hash(),
PrevHash: prevHash,
BkSeq: 0,
Version: 0,
Fee: 0,
UxHash: coin.NewUnspentPool().GetUxHash(),
}
b := coin.Block{
Head: head,
Body: body,
}
// b.Body.Transactions[0].UpdateHeader()
fbc.blocks = append(fbc.blocks, b)
ux := coin.UxOut{
Head: coin.UxHead{
Time: timestamp,
BkSeq: 0,
},
Body: coin.UxBody{
SrcTransaction: txn.InnerHash, //user inner hash
Address: genesisAddr,
Coins: genesisCoins,
Hours: genesisCoins, // Allocate 1 coin hour per coin
},
}
fbc.unspent.Add(ux)
return b
}
// 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
}
func assertValidUnconfirmed(t *testing.T, txns map[cipher.SHA256]UnconfirmedTxn,
txn coin.Transaction) {
ut, ok := txns[txn.Hash()]
assert.True(t, ok)
assert.Equal(t, ut.Txn, txn)
assert.True(t, ut.Announced.IsZero())
assert.False(t, ut.Received.IsZero())
assert.False(t, ut.Checked.IsZero())
}
func TestBlockchainVerifyBlock(t *testing.T) {
ft := FakeTree{}
bc := NewBlockchain(&ft, nil)
gb := bc.CreateGenesisBlock(genAddress, _genCoins, _genTime)
// Genesis block not valid after the fact
assert.NotNil(t, bc.verifyBlock(gb))
assert.Equal(t, bc.Len(), uint64(1))
_, ux := addBlockToBlockchain(t, bc)
assert.Equal(t, bc.Len(), uint64(3))
// Valid block
tx := coin.Transaction{}
tx.PushInput(ux.Hash())
tx.PushOutput(genAddress, ux.Body.Coins, ux.CoinHours(bc.Time()))
tx.SignInputs([]cipher.SecKey{genSecret})
tx.UpdateHeader()
b, err := bc.NewBlockFromTransactions(coin.Transactions{tx}, bc.Time()+_incTime)
assert.Equal(t, len(b.Body.Transactions), 1)
assert.Equal(t, len(b.Body.Transactions[0].Out), 1)
assert.Nil(t, err)
assert.Nil(t, bc.verifyBlock(b))
// Invalid block header
b.Head.BkSeq = gb.Head.BkSeq
assert.Equal(t, len(b.Body.Transactions), 1)
assert.Equal(t, len(b.Body.Transactions[0].Out), 1)
assertError(t, bc.verifyBlock(b), "BkSeq invalid")
// Invalid transactions, makes duplicate outputs
b.Head.BkSeq = bc.Head().Head.BkSeq + 1
b.Body.Transactions = append(b.Body.Transactions, b.Body.Transactions[0])
b.Head.BodyHash = b.HashBody()
assertError(t, bc.verifyBlock(b),
"Duplicate unspent output across transactions")
}
func splitUnspent(t *testing.T, bc *Blockchain, ux coin.UxOut) coin.UxArray {
tx := coin.Transaction{}
hrs := ux.CoinHours(bc.Time())
if hrs < 2 {
log.Panic("Not enough hours, would generate duplicate output")
}
assert.Equal(t, ux.Body.Address, genAddress)
tx.PushInput(ux.Hash())
coinsA := ux.Body.Coins / 2
coinsB := coinsA
if (ux.Body.Coins/1e6)%2 == 1 {
coinsA = (ux.Body.Coins - 1e6) / 2
coinsB = coinsA + 1e6
}
tx.PushOutput(genAddress, coinsA, hrs/4)
tx.PushOutput(genAddress, coinsB, hrs/2)
tx.SignInputs([]cipher.SecKey{genSecret})
tx.UpdateHeader()
b, err := bc.NewBlockFromTransactions(coin.Transactions{tx}, bc.Time()+_incTime)
assert.Nil(t, err)
uxs, err := bc.ExecuteBlock(&b)
assert.Nil(t, err)
assert.Equal(t, len(uxs), 2)
return uxs
}
func TestCreateUnspents(t *testing.T) {
ft := FakeTree{}
bc := NewBlockchain(&ft, nil)
bc.CreateGenesisBlock(genAddress, _genCoins, _genTime)
// 1 out
tx := coin.Transaction{}
tx.PushOutput(genAddress, 11e6, 255)
bh := coin.BlockHeader{
Time: tNow(),
BkSeq: uint64(1),
}
uxout := coin.CreateUnspents(bh, tx)
assert.Equal(t, len(uxout), 1)
assertValidUnspents(t, bh, tx, uxout)
// Multiple outs. Should work regardless of validity
tx = coin.Transaction{}
ux := makeUxOut(t)
tx.PushInput(ux.Hash())
tx.PushOutput(genAddress, 100, 150)
tx.PushOutput(genAddress, 200, 77)
bh.BkSeq++
uxout = coin.CreateUnspents(bh, tx)
assert.Equal(t, len(uxout), 2)
assertValidUnspents(t, bh, tx, uxout)
// No outs
tx = coin.Transaction{}
uxout = coin.CreateUnspents(bh, tx)
assertValidUnspents(t, bh, tx, uxout)
}
//InjectTransaction makes the blockchain server aware of raw transactions
//InjectTransaction inserts the transaction into the unconfirmed set
// TODO: lock for thread safety
func (self *Blockchain) InjectTransaction(txn coin.Transaction) error {
//strict filter would disallow transactions that cant be executed from unspent output set
if txn.Size() > MaxTransactionSize { //16 KB/max size
return errors.New("transaction over size limit")
}
if err := self.blockchain.VerifyTransaction(txn); err != nil {
return err
}
self.Unconfirmed.RecordTxn(txn)
return nil
}
func assertValidUnconfirmed(t *testing.T, txns map[coin.SHA256]UnconfirmedTxn,
txn coin.Transaction, didAnnounce, isOurReceive, isOurSpend bool) {
ut, ok := txns[txn.Hash()]
assert.True(t, ok)
assert.Equal(t, ut.Txn, txn)
assert.Equal(t, ut.IsOurReceive, isOurReceive)
assert.Equal(t, ut.IsOurSpend, isOurSpend)
assert.Equal(t, ut.Announced.IsZero(), !didAnnounce)
assert.False(t, ut.Received.IsZero())
assert.False(t, ut.Checked.IsZero())
}
func assertValidUnspents(t *testing.T, bh coin.BlockHeader, tx coin.Transaction,
uxo coin.UxArray) {
assert.Equal(t, len(tx.Out), len(uxo))
for i, ux := range uxo {
assert.Equal(t, bh.Time, ux.Head.Time)
assert.Equal(t, bh.BkSeq, ux.Head.BkSeq)
assert.Equal(t, tx.Hash(), ux.Body.SrcTransaction)
assert.Equal(t, tx.Out[i].Address, ux.Body.Address)
assert.Equal(t, tx.Out[i].Coins, ux.Body.Coins)
assert.Equal(t, tx.Out[i].Hours, ux.Body.Hours)
}
}
// Performs additional transaction verification at the unconfirmed pool level.
// This checks tunable parameters that should prevent the transaction from
// entering the blockchain, but cannot be done at the blockchain level because
// they may be changed.
func VerifyTransaction(bc *coin.Blockchain, t *coin.Transaction, maxSize int,
burnFactor uint64) error {
if t.Size() > maxSize {
return errors.New("Transaction too large")
}
if fee, err := bc.TransactionFee(t); err != nil {
return err
} else if burnFactor != 0 && t.OutputHours()/burnFactor > fee {
return errors.New("Transaction fee minimum not met")
}
return nil
}
func makeTransactionWithSecret(t *testing.T) (coin.Transaction, cipher.SecKey) {
tx := coin.Transaction{}
ux, s := makeUxOutWithSecret(t)
tx.PushInput(ux.Hash())
tx.SignInputs([]cipher.SecKey{s})
tx.PushOutput(makeAddress(), 10e6, 100)
tx.UpdateHeader()
return tx, s
}
//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
}
// VerifyTransactionFee performs additional transaction verification at the unconfirmed pool level.
// This checks tunable parameters that should prevent the transaction from
// entering the blockchain, but cannot be done at the blockchain level because
// they may be changed.
func VerifyTransactionFee(bc *Blockchain, t *coin.Transaction) error {
fee, err := bc.TransactionFee(t)
if err != nil {
return err
}
//calculate total number of coinhours
var total = t.OutputHours() + fee
//make sure at least half the coin hours are destroyed
if fee < total/BurnFactor {
return errors.New("Transaction coinhour fee minimum not met")
}
return nil
}
func TestSpendsForAddresses(t *testing.T) {
up := NewUnconfirmedTxnPool()
unspent := coin.NewUnspentPool()
addrs := make(map[cipher.Address]byte, 0)
n := 4
useAddrs := make([]cipher.Address, n)
for i, _ := range useAddrs {
useAddrs[i] = makeAddress()
}
useAddrs[1] = useAddrs[0]
for _, a := range useAddrs {
addrs[a] = byte(1)
}
// Make confirmed transactions to add to unspent pool
uxs := make(coin.UxArray, 0)
for i := 0; i < n; i++ {
txn := coin.Transaction{}
txn.PushInput(randSHA256())
txn.PushOutput(useAddrs[i], 10e6, 1000)
uxa := coin.CreateUnspents(coin.BlockHeader{}, txn)
for _, ux := range uxa {
unspent.Add(ux)
}
uxs = append(uxs, uxa...)
}
assert.Equal(t, len(uxs), 4)
// Make unconfirmed txns that spend those unspents
for i := 0; i < n; i++ {
txn := coin.Transaction{}
txn.PushInput(uxs[i].Hash())
txn.PushOutput(makeAddress(), 10e6, 1000)
ut := UnconfirmedTxn{
Txn: txn,
}
up.Txns[ut.Hash()] = ut
}
// Now look them up
assert.Equal(t, len(addrs), 3)
assert.Equal(t, len(up.Txns), 4)
auxs := up.SpendsForAddresses(&unspent, addrs)
assert.Equal(t, len(auxs), 3)
assert.Equal(t, len(auxs[useAddrs[0]]), 2)
assert.Equal(t, len(auxs[useAddrs[2]]), 1)
assert.Equal(t, len(auxs[useAddrs[3]]), 1)
assert.Equal(t, auxs[useAddrs[0]], coin.UxArray{uxs[0], uxs[1]})
assert.Equal(t, auxs[useAddrs[2]], coin.UxArray{uxs[2]})
assert.Equal(t, auxs[useAddrs[3]], coin.UxArray{uxs[3]})
}
// Adds a coin.Transaction to the pool
//func (self *UnconfirmedTxnPool) InjectTxn(bc *coin.Blockchain,
// t coin.Transaction, addrs map[cipher.Address]byte, didAnnounce bool) error {
func (self *UnconfirmedTxnPool) InjectTxn(t coin.Transaction) error {
now := time.Now().Unix()
//announcedAt := util.ZeroTime()
ut := UnconfirmedTxn{
Txn: t,
Received: now,
Checked: now,
Announced: 0, //set to 0 until announced
}
self.Txns[t.Hash()] = ut
return nil
}
//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 assertValidUnspent(t *testing.T, bc *coin.Blockchain,
unspent TxnUnspents, tx coin.Transaction) {
expect := coin.CreateUnspents(bc.Head().Head, tx)
assert.NotEqual(t, len(expect), 0)
sum := 0
for _, uxs := range unspent {
sum += len(uxs)
}
assert.Equal(t, len(expect), sum)
uxs := unspent[tx.Hash()]
for _, ux := range expect {
found := false
for _, u := range uxs {
if u.Hash() == ux.Hash() {
found = true
break
}
}
assert.True(t, found)
}
}
// NewTransaction create skycoin transaction.
func newTransaction(utxos []unspentOut, keys []cipher.SecKey, outs []coin.TransactionOutput) (*coin.Transaction, error) {
tx := coin.Transaction{}
// keys := make([]cipher.SecKey, len(utxos))
for _, u := range utxos {
tx.PushInput(cipher.MustSHA256FromHex(u.Hash))
}
for _, o := range outs {
if (o.Coins % 1e6) != 0 {
return nil, errors.New("skycoin coins must be multiple of 1e6")
}
tx.PushOutput(o.Address, o.Coins, o.Hours)
}
// tx.Verify()
tx.SignInputs(keys)
tx.UpdateHeader()
return &tx, nil
}
func addBlock(bc historydb.Blockchainer, td testData, tm uint64) (*coin.Block, *coin.Transaction, error) {
tx := coin.Transaction{}
// get unspent output
ux, err := getUx(bc, td.Vin.BlockSeq, td.Vin.TxID, td.Vin.Addr)
if err != nil {
return nil, nil, err
}
if ux == nil {
return nil, nil, errors.New("no unspent output")
}
tx.PushInput(ux.Hash())
for _, o := range td.Vouts {
addr, err := cipher.DecodeBase58Address(o.ToAddr)
if err != nil {
return nil, nil, err
}
tx.PushOutput(addr, o.Coins, o.Hours)
}
sigKey := cipher.MustSecKeyFromHex(td.Vin.SigKey)
tx.SignInputs([]cipher.SecKey{sigKey})
tx.UpdateHeader()
if err := bc.VerifyTransaction(tx); err != nil {
return nil, nil, err
}
preBlock := bc.GetBlock(td.PreBlockHash)
b := newBlock(*preBlock, tm, *bc.GetUnspent(), coin.Transactions{tx}, _feeCalc)
// uxs, err := bc.ExecuteBlock(&b)
_, err = bc.ExecuteBlock(&b)
if err != nil {
return nil, nil, err
}
return &b, &tx, nil
}
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 TestProcessTransactions(t *testing.T) {
ft := FakeTree{}
bc := NewBlockchain(&ft, nil)
bc.CreateGenesisBlock(genAddress, _genCoins, _genTime)
fmt.Println("genesis time:", bc.GetGenesisBlock().Time())
assert.Equal(t, bc.Len(), uint64(1))
_, ux := addBlockToBlockchain(t, bc)
assert.Equal(t, bc.Len(), uint64(3))
// Invalid, no transactions in block
// arbitrating=false
txns, err := bc.processTransactions(coin.Transactions{}, false)
assert.Nil(t, txns)
assertError(t, err, "No transactions")
// arbitrating=true
txns, err = bc.processTransactions(coin.Transactions{}, true)
assert.Equal(t, len(txns), 0)
assert.Nil(t, err)
// Invalid, txn.Verify() fails
// TODO -- combine all txn.Verify() failures into one test
// method, and call it from here, from ExecuteBlock(), from
// Verify(), from VerifyTransaction()
txns = coin.Transactions{}
txn := coin.Transaction{}
txn.PushInput(ux.Hash())
txn.PushOutput(genAddress, 777, 100)
txn.SignInputs([]cipher.SecKey{genSecret})
txn.UpdateHeader()
txns = append(txns, txn)
// arbitrating=false
txns2, err := bc.processTransactions(txns, false)
assert.Nil(t, txns2)
assertError(t, err,
"Transaction outputs must be multiple of 1e6 base units")
// arbitrating=true
txns2, err = bc.processTransactions(txns, true)
assert.NotNil(t, txns2)
assert.Nil(t, err)
assert.Equal(t, len(txns2), 0)
// Invalid, duplicate unspent will be created by these txns
txn, _ = makeTransactionForChainWithHoursFee(t, bc, ux, genSecret, 100,
100)
txns = coin.Transactions{txn, txn}
// arbitrating=false
txns2, err = bc.processTransactions(txns, false)
assertError(t, err, "Duplicate unspent output across transactions")
assert.Nil(t, txns2)
// arbitrating=true. One of the offending transactions should be removed
txns2, err = bc.processTransactions(txns, true)
assert.Nil(t, err)
assert.Equal(t, len(txns2), 1)
assert.Equal(t, txns2[0], txn)
// Check that a new output will not collide with the existing pool
txn, _ = makeTransactionForChainWithHoursFee(t, bc, ux, genSecret, 100,
100)
txns = coin.Transactions{txn}
uxb := coin.UxBody{
SrcTransaction: txn.Hash(),
Coins: txn.Out[0].Coins,
Hours: txn.Out[0].Hours,
Address: txn.Out[0].Address,
}
bc.GetUnspent().Add(coin.UxOut{Body: uxb})
// arbitrating=false
txns2, err = bc.processTransactions(txns, false)
assertError(t, err, "New unspent collides with existing unspent")
assert.Nil(t, txns2)
// arbitrating=true
txns2, err = bc.processTransactions(txns, true)
assert.Equal(t, len(txns2), 0)
assert.NotNil(t, txns2)
assert.Nil(t, err)
// Spending of duplicate inputs being spent across txns
txn, _ = makeTransactionForChainWithHoursFee(t, bc, ux, genSecret, 100,
100)
txn2, _ := makeTransactionForChainWithHoursFee(t, bc, ux, genSecret, 100,
100)
txn2.Out = nil
txn2.PushOutput(makeAddress(), 1e6, 100)
txn2.PushOutput(makeAddress(), ux.Body.Coins-1e6, 100)
txn2.Sigs = nil
txn2.SignInputs([]cipher.SecKey{genSecret})
txn2.UpdateHeader()
txns = coin.SortTransactions(coin.Transactions{txn, txn2}, bc.TransactionFee)
// arbitrating=false
txns2, err = bc.processTransactions(txns, false)
assertError(t, err, "Cannot spend output twice in the same block")
assert.Nil(t, txns2)
// arbitrating=true
txns2, err = bc.processTransactions(txns, true)
assert.Nil(t, err)
assert.Equal(t, len(txns2), 1)
assert.Equal(t, txns2[0], txns[0])
}
// Creates a Transaction spending coins and hours from our coins
func CreateSpendingTransaction(wallet Wallet, unconfirmed *UnconfirmedTxnPool,
unspent *coin.UnspentPool, headTime uint64, amt Balance,
fee, burnFactor uint64, dest coin.Address) (coin.Transaction, error) {
txn := coin.Transaction{}
auxs := unspent.AllForAddresses(wallet.GetAddresses())
// Subtract pending spends from available
puxs := unconfirmed.SpendsForAddresses(unspent, wallet.GetAddressSet())
auxs = auxs.Sub(puxs)
// Determine which unspents to spend
spends, err := createSpends(headTime, auxs.Flatten(), amt, fee, burnFactor)
if err != nil {
return txn, err
}
// Add these unspents as tx inputs
toSign := make([]coin.SecKey, len(spends))
spending := Balance{0, 0}
for i, au := range spends {
entry, exists := wallet.GetEntry(au.Body.Address)
if !exists {
log.Panic("On second thought, the wallet entry does not exist")
}
txn.PushInput(au.Hash())
toSign[i] = entry.Secret
spending.Coins += au.Body.Coins
spending.Hours += au.CoinHours(headTime)
}
// Determine how much change we get back, if any
_, changeHours, err := calculateBurnAndChange(spending.Hours,
amt.Hours, fee, burnFactor)
if err != nil {
// This should not occur, else createSpends is broken
return txn, err
}
change := NewBalance(spending.Coins-amt.Coins, changeHours)
// TODO -- send change to a new address
changeAddr := spends[0].Body.Address
if change.Coins == 0 {
if change.Hours > 0 {
msg := ("Have enough coins, but not enough to send coin hours " +
"change back. Would spend %d more hours than requested.")
return txn, fmt.Errorf(msg, change.Hours)
}
} else {
txn.PushOutput(changeAddr, change.Coins, change.Hours)
}
// Finalize the the transaction
txn.PushOutput(dest, amt.Coins, amt.Hours)
txn.SignInputs(toSign)
txn.UpdateHeader()
return txn, nil
}
//DEPRECATE
//deprecate dependency on wallet
// Creates a Transaction spending coins and hours from our coins
//MOVE SOMEWHERE ELSE
//Move to wallet or move to ???
func CreateSpendingTransaction(wlt wallet.Wallet,
unconfirmed *UnconfirmedTxnPool, unspent *coin.UnspentPool,
headTime uint64, amt wallet.Balance,
dest cipher.Address) (coin.Transaction, error) {
txn := coin.Transaction{}
auxs := unspent.AllForAddresses(wlt.GetAddresses())
// Subtract pending spends from available
puxs := unconfirmed.SpendsForAddresses(unspent, wlt.GetAddressSet())
auxs = auxs.Sub(puxs)
// Determine which unspents to spend
spends, err := createSpends(headTime, auxs.Flatten(), amt)
if err != nil {
return txn, err
}
// Add these unspents as tx inputs
toSign := make([]cipher.SecKey, len(spends))
spending := wallet.Balance{0, 0}
for i, au := range spends {
entry, exists := wlt.GetEntry(au.Body.Address)
if !exists {
log.Panic("On second thought, the wallet entry does not exist")
}
txn.PushInput(au.Hash())
toSign[i] = entry.Secret
spending.Coins += au.Body.Coins
spending.Hours += au.CoinHours(headTime)
}
//keep 1/4th of hours as change
//send half to each address
var changeHours uint64 = spending.Hours / 4
if amt.Coins == spending.Coins {
txn.PushOutput(dest, amt.Coins, changeHours/2)
txn.SignInputs(toSign)
txn.UpdateHeader()
return txn, nil
}
change := wallet.NewBalance(spending.Coins-amt.Coins, changeHours/2)
// TODO -- send change to a new address
changeAddr := spends[0].Body.Address
//create transaction
txn.PushOutput(changeAddr, change.Coins, change.Hours)
txn.PushOutput(dest, amt.Coins, changeHours/2)
txn.SignInputs(toSign)
txn.UpdateHeader()
return txn, nil
}
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
}