145 lines
3.3 KiB
Go
145 lines
3.3 KiB
Go
package uspv
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import (
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"bytes"
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"fmt"
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"log"
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"github.com/btcsuite/btcd/wire"
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"github.com/btcsuite/btcutil"
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"github.com/btcsuite/btcutil/bloom"
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)
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type TxStore struct {
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KnownTxids []*wire.ShaHash
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Utxos []Utxo // stacks on stacks
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Sum int64 // racks on racks
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Adrs []MyAdr // endeavouring to acquire capital
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}
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type Utxo struct { // cash money.
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// combo of outpoint and txout which has all the info needed to spend
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Op wire.OutPoint
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Txo wire.TxOut
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AtHeight uint32 // 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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}
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type MyAdr struct { // an address I have the private key for
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btcutil.Address
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KeyIdx uint32 // index for private key needed to sign / spend
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}
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// add addresses into the TxStore
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func (t *TxStore) AddAdr(a btcutil.Address, kidx uint32) {
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var ma MyAdr
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ma.Address = a
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ma.KeyIdx = kidx
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t.Adrs = append(t.Adrs, ma)
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return
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}
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// add txid of interest
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func (t *TxStore) AddTxid(txid *wire.ShaHash) 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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t.KnownTxids = append(t.KnownTxids, txid)
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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 addresses to filter for")
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}
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f := bloom.NewFilter(uint32(len(t.Adrs)), 0, 0.001, wire.BloomUpdateNone)
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for _, a := range t.Adrs {
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f.Add(a.ScriptAddress())
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}
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return f, nil
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}
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// Ingest a tx into wallet, dealing with both gains and losses
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func (t *TxStore) IngestTx(tx *wire.MsgTx) error {
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var match bool
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inTxid := tx.TxSha()
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for _, ktxid := range t.KnownTxids {
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if inTxid.IsEqual(ktxid) {
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match = true
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break // found tx match,
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}
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}
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if !match {
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return fmt.Errorf("we don't care about tx %s", inTxid.String())
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}
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err := t.AbsorbTx(tx)
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if err != nil {
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return err
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}
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err = t.ExpellTx(tx)
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if err != nil {
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return err
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}
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// fmt.Printf("ingested tx %s total amt %d\n", inTxid.String(), t.Sum)
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return nil
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}
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// Absorb money into wallet from a tx
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func (t *TxStore) AbsorbTx(tx *wire.MsgTx) error {
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if tx == nil {
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return fmt.Errorf("Tried to add nil tx")
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}
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var hits uint32
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var acq int64
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// check if any of the tx's outputs match my adrs
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for i, out := range tx.TxOut { // in each output of tx
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for _, a := range t.Adrs { // compare to each adr we have
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// more correct would be to check for full script
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// contains could have false positive? (p2sh/p2pkh same hash ..?)
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if bytes.Contains(out.PkScript, a.ScriptAddress()) { // hit
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hits++
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acq += out.Value
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var newu Utxo
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newu.KeyIdx = a.KeyIdx
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newu.Txo = *out
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var newop wire.OutPoint
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newop.Hash = tx.TxSha()
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newop.Index = uint32(i)
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newu.Op = newop
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t.Utxos = append(t.Utxos, newu)
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break
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}
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}
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}
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log.Printf("%d hits, acquired %d", hits, acq)
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t.Sum += acq
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return nil
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}
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// Expell money from wallet due to a tx
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func (t *TxStore) ExpellTx(tx *wire.MsgTx) error {
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if tx == nil {
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return fmt.Errorf("Tried to add nil tx")
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}
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var hits uint32
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var loss int64
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for _, in := range tx.TxIn {
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for i, myutxo := range t.Utxos {
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if myutxo.Op == in.PreviousOutPoint {
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hits++
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loss += myutxo.Txo.Value
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// delete from my utxo set
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t.Utxos = append(t.Utxos[:i], t.Utxos[i+1:]...)
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}
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}
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}
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log.Printf("%d hits, lost %d", hits, loss)
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t.Sum -= loss
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return nil
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}
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