// Creates a Transaction spending coins and hours from our coins
func CreateSpendingTransaction(wlt wallet.Wallet,
unconfirmed *UnconfirmedTxnPool, unspent *coin.UnspentPool,
headTime uint64, amt wallet.Balance, fee, burnFactor uint64,
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, fee, burnFactor)
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)
}
// 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 := wallet.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
}
