fcff17c336
This commit will allow the general public to build lnd without jumping through hoops setting up their local git branches nicely with all of our forks.
363 lines
9.1 KiB
Go
363 lines
9.1 KiB
Go
package uspv
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import (
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"bytes"
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"encoding/binary"
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"fmt"
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"log"
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"sync"
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"github.com/roasbeef/btcd/chaincfg"
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"github.com/boltdb/bolt"
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"github.com/roasbeef/btcd/wire"
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"github.com/roasbeef/btcutil"
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"github.com/roasbeef/btcutil/bloom"
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"github.com/roasbeef/btcutil/hdkeychain"
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)
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type TxStore struct {
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OKTxids map[wire.ShaHash]int32 // known good txids and their heights
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OKMutex sync.Mutex
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Adrs []MyAdr // endeavouring to acquire capital
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StateDB *bolt.DB // place to write all this down
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localFilter *bloom.Filter // local bloom filter for hard mode
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// Params live here, not SCon
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Param *chaincfg.Params // network parameters (testnet3, testnetL)
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// From here, comes everything. It's a secret to everybody.
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rootPrivKey *hdkeychain.ExtendedKey
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}
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type Utxo struct { // cash money.
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Op wire.OutPoint // where
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// all the info needed to spend
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AtHeight int32 // block height where this tx was confirmed, 0 for unconf
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KeyIdx uint32 // index for private key needed to sign / spend
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Value int64 // higher is better
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// IsCoinbase bool // can't spend for a while
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IsWit bool // true if p2wpkh output
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}
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// Stxo is a utxo that has moved on.
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type Stxo struct {
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Utxo // when it used to be a utxo
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SpendHeight int32 // height at which it met its demise
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SpendTxid wire.ShaHash // the tx that consumed it
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}
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type MyAdr struct { // an address I have the private key for
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PkhAdr btcutil.Address
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KeyIdx uint32 // index for private key needed to sign / spend
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// ^^ this is kindof redundant because it'll just be their position
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// inside the Adrs slice, right? leave for now
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}
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func NewTxStore(rootkey *hdkeychain.ExtendedKey, p *chaincfg.Params) TxStore {
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var txs TxStore
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txs.rootPrivKey = rootkey
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txs.Param = p
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txs.OKTxids = make(map[wire.ShaHash]int32)
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return txs
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}
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// add txid of interest
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func (t *TxStore) AddTxid(txid *wire.ShaHash, height int32) error {
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if txid == nil {
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return fmt.Errorf("tried to add nil txid")
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}
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log.Printf("added %s to OKTxids at height %d\n", txid.String(), height)
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t.OKMutex.Lock()
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t.OKTxids[*txid] = height
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t.OKMutex.Unlock()
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return nil
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}
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// ... or I'm gonna fade away
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func (t *TxStore) GimmeFilter() (*bloom.Filter, error) {
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if len(t.Adrs) == 0 {
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return nil, fmt.Errorf("no address to filter for")
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}
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// get all utxos to add outpoints to filter
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allUtxos, err := t.GetAllUtxos()
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if err != nil {
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return nil, err
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}
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elem := uint32(len(t.Adrs) + len(allUtxos))
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f := bloom.NewFilter(elem, 0, 0.000001, wire.BloomUpdateAll)
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// note there could be false positives since we're just looking
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// for the 20 byte PKH without the opcodes.
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for _, a := range t.Adrs { // add 20-byte pubkeyhash
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f.Add(a.PkhAdr.ScriptAddress())
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}
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for _, u := range allUtxos {
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f.AddOutPoint(&u.Op)
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}
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return f, nil
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}
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// GetDoubleSpends takes a transaction and compares it with
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// all transactions in the db. It returns a slice of all txids in the db
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// which are double spent by the received tx.
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func CheckDoubleSpends(
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argTx *wire.MsgTx, txs []*wire.MsgTx) ([]*wire.ShaHash, error) {
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var dubs []*wire.ShaHash // slice of all double-spent txs
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argTxid := argTx.TxSha()
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for _, compTx := range txs {
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compTxid := compTx.TxSha()
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// check if entire tx is dup
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if argTxid.IsEqual(&compTxid) {
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return nil, fmt.Errorf("tx %s is dup", argTxid.String())
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}
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// not dup, iterate through inputs of argTx
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for _, argIn := range argTx.TxIn {
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// iterate through inputs of compTx
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for _, compIn := range compTx.TxIn {
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if OutPointsEqual(
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argIn.PreviousOutPoint, compIn.PreviousOutPoint) {
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// found double spend
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dubs = append(dubs, &compTxid)
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break // back to argIn loop
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}
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}
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}
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}
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return dubs, nil
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}
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// TxToString prints out some info about a transaction. for testing / debugging
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func TxToString(tx *wire.MsgTx) string {
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str := fmt.Sprintf("size %d vsize %d wsize %d locktime %d flag %x txid %s\n",
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tx.SerializeSize(), tx.VirtualSize(), tx.SerializeSizeWitness(),
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tx.LockTime, tx.Flags, tx.TxSha().String())
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for i, in := range tx.TxIn {
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str += fmt.Sprintf("Input %d spends %s\n", i, in.PreviousOutPoint.String())
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str += fmt.Sprintf("\tSigScript: %x\n", in.SignatureScript)
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for j, wit := range in.Witness {
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str += fmt.Sprintf("\twitness %d: %x\n", j, wit)
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}
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}
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for i, out := range tx.TxOut {
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if out != nil {
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str += fmt.Sprintf("output %d script: %x amt: %d\n",
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i, out.PkScript, out.Value)
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} else {
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str += fmt.Sprintf("output %d nil (WARNING)\n", i)
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}
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}
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return str
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}
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// need this because before I was comparing pointers maybe?
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// so they were the same outpoint but stored in 2 places so false negative?
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func OutPointsEqual(a, b wire.OutPoint) bool {
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if !a.Hash.IsEqual(&b.Hash) {
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return false
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}
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return a.Index == b.Index
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}
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/*----- serialization for tx outputs ------- */
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// outPointToBytes turns an outpoint into 36 bytes.
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func outPointToBytes(op *wire.OutPoint) ([]byte, error) {
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var buf bytes.Buffer
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_, err := buf.Write(op.Hash.Bytes())
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if err != nil {
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return nil, err
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}
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// write 4 byte outpoint index within the tx to spend
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err = binary.Write(&buf, binary.BigEndian, op.Index)
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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/*----- serialization for utxos ------- */
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/* Utxos serialization:
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byte length desc at offset
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32 txid 0
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4 idx 32
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4 height 36
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4 keyidx 40
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8 amt 44
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1 flag 52
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end len 53
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*/
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// ToBytes turns a Utxo into some bytes.
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// note that the txid is the first 36 bytes and in our use cases will be stripped
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// off, but is left here for other applications
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func (u *Utxo) ToBytes() ([]byte, error) {
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var buf bytes.Buffer
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// write 32 byte txid of the utxo
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_, err := buf.Write(u.Op.Hash.Bytes())
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if err != nil {
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return nil, err
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}
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// write 4 byte outpoint index within the tx to spend
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err = binary.Write(&buf, binary.BigEndian, u.Op.Index)
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if err != nil {
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return nil, err
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}
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// write 4 byte height of utxo
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err = binary.Write(&buf, binary.BigEndian, u.AtHeight)
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if err != nil {
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return nil, err
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}
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// write 4 byte key index of utxo
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err = binary.Write(&buf, binary.BigEndian, u.KeyIdx)
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if err != nil {
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return nil, err
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}
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// write 8 byte amount of money at the utxo
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err = binary.Write(&buf, binary.BigEndian, u.Value)
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if err != nil {
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return nil, err
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}
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// last byte indicates tx witness flags ( tx[5] from serialized tx)
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// write a 1 at the end for p2wpkh (same as flags byte)
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witByte := byte(0x00)
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if u.IsWit {
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witByte = 0x01
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}
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err = buf.WriteByte(witByte)
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// UtxoFromBytes turns bytes into a Utxo. Note it wants the txid and outindex
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// in the first 36 bytes, which isn't stored that way in the boldDB,
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// but can be easily appended.
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func UtxoFromBytes(b []byte) (Utxo, error) {
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var u Utxo
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if b == nil {
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return u, fmt.Errorf("nil input slice")
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}
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buf := bytes.NewBuffer(b)
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if buf.Len() < 53 { // utxos are 53 bytes
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return u, fmt.Errorf("Got %d bytes for utxo, expect 53", buf.Len())
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}
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// read 32 byte txid
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err := u.Op.Hash.SetBytes(buf.Next(32))
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if err != nil {
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return u, err
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}
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// read 4 byte outpoint index within the tx to spend
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err = binary.Read(buf, binary.BigEndian, &u.Op.Index)
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if err != nil {
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return u, err
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}
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// read 4 byte height of utxo
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err = binary.Read(buf, binary.BigEndian, &u.AtHeight)
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if err != nil {
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return u, err
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}
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// read 4 byte key index of utxo
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err = binary.Read(buf, binary.BigEndian, &u.KeyIdx)
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if err != nil {
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return u, err
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}
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// read 8 byte amount of money at the utxo
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err = binary.Read(buf, binary.BigEndian, &u.Value)
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if err != nil {
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return u, err
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}
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// read 1 byte witness flags
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witByte, err := buf.ReadByte()
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if err != nil {
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return u, err
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}
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if witByte != 0x00 {
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u.IsWit = true
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}
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return u, nil
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}
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/*----- serialization for stxos ------- */
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/* Stxo serialization:
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byte length desc at offset
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53 utxo 0
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4 sheight 53
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32 stxid 57
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end len 89
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*/
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// ToBytes turns an Stxo into some bytes.
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// prevUtxo serialization, then spendheight [4], spendtxid [32]
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func (s *Stxo) ToBytes() ([]byte, error) {
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var buf bytes.Buffer
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// first serialize the utxo part
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uBytes, err := s.Utxo.ToBytes()
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if err != nil {
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return nil, err
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}
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// write that into the buffer first
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_, err = buf.Write(uBytes)
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if err != nil {
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return nil, err
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}
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// write 4 byte height where the txo was spent
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err = binary.Write(&buf, binary.BigEndian, s.SpendHeight)
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if err != nil {
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return nil, err
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}
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// write 32 byte txid of the spending transaction
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_, err = buf.Write(s.SpendTxid.Bytes())
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if err != nil {
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return nil, err
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}
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return buf.Bytes(), nil
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}
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// StxoFromBytes turns bytes into a Stxo.
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// first take the first 53 bytes as a utxo, then the next 36 for how it's spent.
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func StxoFromBytes(b []byte) (Stxo, error) {
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var s Stxo
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if len(b) < 89 {
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return s, fmt.Errorf("Got %d bytes for stxo, expect 89", len(b))
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}
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u, err := UtxoFromBytes(b[:53])
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if err != nil {
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return s, err
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}
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s.Utxo = u // assign the utxo
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buf := bytes.NewBuffer(b[53:]) // make buffer for spend data
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// read 4 byte spend height
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err = binary.Read(buf, binary.BigEndian, &s.SpendHeight)
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if err != nil {
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return s, err
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}
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// read 32 byte txid
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err = s.SpendTxid.SetBytes(buf.Next(32))
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if err != nil {
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return s, err
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}
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return s, nil
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}
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