// This isusually the most time consuming process when applying a new block
func (ch *Chain) commitTxs(bl *btc.Block, changes *BlockChanges) (e error) {
sumblockin := btc.GetBlockReward(changes.Height)
var txoutsum, txinsum, sumblockout uint64
if changes.Height+ch.Unspent.UnwindBufLen >= changes.LastKnownHeight {
changes.UndoData = make(map[[32]byte]*QdbRec)
}
blUnsp := make(map[[32]byte][]*btc.TxOut, 4*len(bl.Txs))
var wg sync.WaitGroup
var ver_err_cnt uint32
for i := range bl.Txs {
txoutsum, txinsum = 0, 0
bl.SigopsCost += uint32(btc.WITNESS_SCALE_FACTOR * bl.Txs[i].GetLegacySigOpCount())
// Check each tx for a valid input, except from the first one
if i > 0 {
tx_trusted := bl.Trusted
if !tx_trusted && TrustedTxChecker != nil && TrustedTxChecker(bl.Txs[i].Hash) {
tx_trusted = true
}
for j := 0; j < len(bl.Txs[i].TxIn); j++ {
inp := &bl.Txs[i].TxIn[j].Input
spendrec, waspent := changes.DeledTxs[inp.Hash]
if waspent && spendrec[inp.Vout] {
println("txin", inp.String(), "already spent in this block")
e = errors.New("Input spent more then once in same block")
return
}
tout := ch.PickUnspent(inp)
if tout == nil {
t, ok := blUnsp[inp.Hash]
if !ok {
e = errors.New("Unknown input TxID: " + btc.NewUint256(inp.Hash[:]).String())
return
}
if inp.Vout >= uint32(len(t)) {
println("Vout too big", len(t), inp.String())
e = errors.New("Vout too big")
return
}
if t[inp.Vout] == nil {
println("Vout already spent", inp.String())
e = errors.New("Vout already spent")
return
}
if t[inp.Vout].WasCoinbase {
e = errors.New("Cannot spend block's own coinbase in TxID: " + btc.NewUint256(inp.Hash[:]).String())
return
}
tout = t[inp.Vout]
t[inp.Vout] = nil // and now mark it as spent:
} else {
if tout.WasCoinbase && changes.Height-tout.BlockHeight < COINBASE_MATURITY {
e = errors.New("Trying to spend prematured coinbase: " + btc.NewUint256(inp.Hash[:]).String())
return
}
// it is confirmed already so delete it later
if !waspent {
spendrec = make([]bool, tout.VoutCount)
changes.DeledTxs[inp.Hash] = spendrec
}
spendrec[inp.Vout] = true
if changes.UndoData != nil {
var urec *QdbRec
urec = changes.UndoData[inp.Hash]
if urec == nil {
urec = new(QdbRec)
urec.TxID = inp.Hash
urec.Coinbase = tout.WasCoinbase
urec.InBlock = tout.BlockHeight
urec.Outs = make([]*QdbTxOut, tout.VoutCount)
changes.UndoData[inp.Hash] = urec
}
tmp := new(QdbTxOut)
tmp.Value = tout.Value
tmp.PKScr = make([]byte, len(tout.Pk_script))
copy(tmp.PKScr, tout.Pk_script)
urec.Outs[inp.Vout] = tmp
}
}
if !tx_trusted { // run VerifyTxScript() in a parallel task
wg.Add(1)
go func(prv []byte, amount uint64, i int, tx *btc.Tx) {
if !script.VerifyTxScript(prv, amount, i, tx, bl.VerifyFlags) {
atomic.AddUint32(&ver_err_cnt, 1)
}
wg.Done()
}(tout.Pk_script, tout.Value, j, bl.Txs[i])
}
if btc.IsP2SH(tout.Pk_script) {
bl.SigopsCost += uint32(btc.WITNESS_SCALE_FACTOR * btc.GetP2SHSigOpCount(bl.Txs[i].TxIn[j].ScriptSig))
}
bl.SigopsCost += uint32(bl.Txs[i].CountWitnessSigOps(j, tout.Pk_script))
txinsum += tout.Value
}
if !tx_trusted {
wg.Wait()
if ver_err_cnt > 0 {
println("VerifyScript failed", ver_err_cnt, "time(s)")
return errors.New(fmt.Sprint("VerifyScripts failed ", ver_err_cnt, "time(s)"))
}
}
} else {
// For coinbase tx we need to check (like satoshi) whether the script size is between 2 and 100 bytes
// (Previously we made sure in CheckBlock() that this was a coinbase type tx)
if len(bl.Txs[0].TxIn[0].ScriptSig) < 2 || len(bl.Txs[0].TxIn[0].ScriptSig) > 100 {
return errors.New(fmt.Sprint("Coinbase script has a wrong length ", len(bl.Txs[0].TxIn[0].ScriptSig)))
}
}
sumblockin += txinsum
for j := range bl.Txs[i].TxOut {
txoutsum += bl.Txs[i].TxOut[j].Value
}
sumblockout += txoutsum
if e != nil {
return // If any input fails, do not continue
}
if i > 0 {
bl.Txs[i].Fee = txinsum - txoutsum
if txoutsum > txinsum {
return errors.New(fmt.Sprintf("More spent (%.8f) than at the input (%.8f) in TX %s",
float64(txoutsum)/1e8, float64(txinsum)/1e8, bl.Txs[i].Hash.String()))
}
}
// Add each tx outs from the currently executed TX to the temporary pool
outs := make([]*btc.TxOut, len(bl.Txs[i].TxOut))
copy(outs, bl.Txs[i].TxOut)
blUnsp[bl.Txs[i].Hash.Hash] = outs
}
if sumblockin < sumblockout {
return errors.New(fmt.Sprintf("Out:%d > In:%d", sumblockout, sumblockin))
}
if bl.SigopsCost > btc.MAX_BLOCK_SIGOPS_COST {
return errors.New("commitTxs(): too many sigops - RPC_Result:bad-blk-sigops")
}
var rec *QdbRec
for k, v := range blUnsp {
for i := range v {
if v[i] != nil {
if rec == nil {
rec = new(QdbRec)
rec.TxID = k
rec.Coinbase = v[i].WasCoinbase
rec.InBlock = changes.Height
rec.Outs = make([]*QdbTxOut, len(v))
}
rec.Outs[i] = &QdbTxOut{Value: v[i].Value, PKScr: v[i].Pk_script}
}
}
if rec != nil {
changes.AddList = append(changes.AddList, rec)
rec = nil
}
}
return nil
}