6ef9dc3d4a
redo how db and header sync works, somewhat simpler but a little recursve-ish. There is still an off by 1 error somewhere with headers.
256 lines
7.0 KiB
Go
256 lines
7.0 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/txscript"
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"github.com/btcsuite/btcd/chaincfg"
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"github.com/boltdb/bolt"
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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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"github.com/btcsuite/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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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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LastIdx uint32 // should equal len(Adrs)
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StateDB *bolt.DB // place to write all this down
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// this is redundant with the SPVCon param... ugly and should be taken out
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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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}
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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) TxStore {
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var txs TxStore
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txs.rootPrivKey = rootkey
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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 addresses into the TxStore in memory
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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.PkhAdr = 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, 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.OKTxids[*txid] = height
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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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// add addresses to look for incoming
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nutxo, err := t.NumUtxos()
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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)) + nutxo
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f := bloom.NewFilter(elem, 0, 0.000001, wire.BloomUpdateAll)
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for _, a := range t.Adrs {
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f.Add(a.PkhAdr.ScriptAddress())
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}
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// add txids of utxos to look for outgoing
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for _, u := range t.Utxos {
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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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// Ingest a tx into wallet, dealing with both gains and losses
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func (t *TxStore) AckTx(tx *wire.MsgTx) (uint32, error) {
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var ioHits uint32 // number of utxos changed due to this tx
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inTxid := tx.TxSha()
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height, ok := t.OKTxids[inTxid]
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if !ok {
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log.Printf("%s", TxToString(tx))
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return 0, fmt.Errorf("tx %s not in OKTxids.", inTxid.String())
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}
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delete(t.OKTxids, inTxid) // don't need anymore
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hitsGained, err := t.AbsorbTx(tx, height)
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if err != nil {
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return 0, err
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}
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hitsLost, err := t.ExpellTx(tx, height)
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if err != nil {
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return 0, err
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}
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ioHits = hitsGained + hitsLost
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// fmt.Printf("ingested tx %s total amt %d\n", inTxid.String(), t.Sum)
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return ioHits, nil
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}
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// AbsorbTx Absorbs money into wallet from a tx. returns number of
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// new utxos absorbed.
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func (t *TxStore) AbsorbTx(tx *wire.MsgTx, height int32) (uint32, error) {
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if tx == nil {
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return 0, fmt.Errorf("Tried to add nil tx")
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}
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newTxid := tx.TxSha()
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var hits uint32 // how many outputs of this tx are ours
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var acq int64 // total acquirement from this tx
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// check if any of the tx's outputs match my known outpoints
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for i, out := range tx.TxOut { // in each output of tx
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dup := false // start by assuming its new until found duplicate
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newOp := wire.NewOutPoint(&newTxid, uint32(i))
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// first look for dupes -- already known outpoints.
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// if we find a dupe here overwrite it to the DB.
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for _, u := range t.Utxos {
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dup = OutPointsEqual(*newOp, u.Op) // is this outpoint known?
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if dup { // found dupe
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fmt.Printf(" %s is dupe\t", newOp.String())
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hits++ // thought a dupe, still a hit
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u.AtHeight = height // ONLY difference is height
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// save modified utxo to db, overwriting old one
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err := t.SaveUtxo(u)
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if err != nil {
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return 0, err
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}
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break // out of the t.Utxo range loop
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}
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}
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if dup {
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// if we found the outpoint to be a dup above, don't add it again
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// when it matches an address, just go to the next outpoint
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continue
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}
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// check if this is a new txout matching one of my addresses
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for _, a := range t.Adrs { // compare to each adr we have
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// check for full script to eliminate false positives
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aPKscript, err := txscript.PayToAddrScript(a.PkhAdr)
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if err != nil {
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return 0, err
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}
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if bytes.Equal(out.PkScript, aPKscript) { // hit
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// already checked for dupes, so this must be a new outpoint
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var newu Utxo
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newu.AtHeight = height
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newu.KeyIdx = a.KeyIdx
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newu.Value = out.Value
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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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err = t.SaveUtxo(&newu)
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if err != nil {
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return 0, err
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}
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acq += out.Value
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hits++
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t.Utxos = append(t.Utxos, &newu) // always add new utxo
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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 hits, 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, height int32) (uint32, error) {
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if tx == nil {
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return 0, 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 OutPointsEqual(myutxo.Op, in.PreviousOutPoint) {
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hits++
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loss += myutxo.Value
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err := t.MarkSpent(*myutxo, height, tx)
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if err != nil {
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return 0, err
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}
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// delete from my in-ram 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 hits, nil
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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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// 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 := "\t\t\t - Tx - \n"
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for i, in := range tx.TxIn {
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str += fmt.Sprintf("Input %d: %s\n", i, in.PreviousOutPoint.String())
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str += fmt.Sprintf("SigScript for input %d: %x\n", i, in.SignatureScript)
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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("\toutput %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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