// NewTxDeepTxIns is used to deep copy a transaction, maintaining the old
// pointers to the TxOuts while replacing the old pointers to the TxIns with
// deep copies. This is to prevent races when the fraud proofs for the
// transactions are set by the miner.
func NewTxDeepTxIns(msgTx *wire.MsgTx) *Tx {
if msgTx == nil {
return nil
}
newMsgTx := new(wire.MsgTx)
// Copy the fixed fields.
newMsgTx.Version = msgTx.Version
newMsgTx.LockTime = msgTx.LockTime
newMsgTx.Expiry = msgTx.Expiry
// Copy the TxIns deeply.
for _, txIn := range msgTx.TxIn {
sigScrLen := len(txIn.SignatureScript)
sigScrCopy := make([]byte, sigScrLen, sigScrLen)
txInCopy := new(wire.TxIn)
txInCopy.PreviousOutPoint.Hash = txIn.PreviousOutPoint.Hash
txInCopy.PreviousOutPoint.Index = txIn.PreviousOutPoint.Index
txInCopy.PreviousOutPoint.Tree = txIn.PreviousOutPoint.Tree
txInCopy.Sequence = txIn.Sequence
txInCopy.ValueIn = txIn.ValueIn
txInCopy.BlockHeight = txIn.BlockHeight
txInCopy.BlockIndex = txIn.BlockIndex
txInCopy.SignatureScript = sigScrCopy
newMsgTx.AddTxIn(txIn)
}
// Shallow copy the TxOuts.
for _, txOut := range msgTx.TxOut {
newMsgTx.AddTxOut(txOut)
}
return &Tx{
hash: msgTx.TxHash(),
msgTx: msgTx,
txTree: wire.TxTreeUnknown,
txIndex: TxIndexUnknown,
}
}