mirror of
https://github.com/lightningnetwork/lnd.git
synced 2024-11-20 02:27:21 +01:00
2f9fc87636
Synchronization now seems to work well even with the rapid fire many inv-block messages that I'm seeing often on testnet3. I'm not 100% sure measuring the len() of a buffered channel is safe but it seems to work fine. Got rid of 'sum' in the TxStore; can be computed from GetAllUtxos() Might want to merge SCon and TxStore since there's not much going on in TxStore any more...
364 lines
8.8 KiB
Go
364 lines
8.8 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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"github.com/btcsuite/btcd/blockchain"
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"github.com/btcsuite/btcd/txscript"
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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/hdkeychain"
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"github.com/boltdb/bolt"
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)
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var (
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BKTUtxos = []byte("DuffelBag") // leave the rest to collect interest
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BKTStxos = []byte("SpentTxs") // for bookkeeping
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BKTTxns = []byte("Txns") // all txs we care about, for replays
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BKTState = []byte("MiscState") // last state of DB
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// these are in the state bucket
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KEYNumKeys = []byte("NumKeys") // number of keys used
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KEYTipHeight = []byte("TipHeight") // height synced to
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)
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func (ts *TxStore) OpenDB(filename string) error {
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var err error
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var numKeys uint32
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ts.StateDB, err = bolt.Open(filename, 0644, nil)
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if err != nil {
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return err
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}
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// create buckets if they're not already there
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err = ts.StateDB.Update(func(btx *bolt.Tx) error {
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_, err = btx.CreateBucketIfNotExists(BKTUtxos)
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if err != nil {
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return err
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}
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_, err = btx.CreateBucketIfNotExists(BKTStxos)
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if err != nil {
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return err
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}
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_, err = btx.CreateBucketIfNotExists(BKTTxns)
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if err != nil {
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return err
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}
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sta, err := btx.CreateBucketIfNotExists(BKTState)
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if err != nil {
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return err
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}
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numKeysBytes := sta.Get(KEYNumKeys)
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if numKeysBytes != nil { // NumKeys exists, read into uint32
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buf := bytes.NewBuffer(numKeysBytes)
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err := binary.Read(buf, binary.BigEndian, &numKeys)
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if err != nil {
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return err
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}
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fmt.Printf("db says %d keys\n", numKeys)
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} else { // no adrs yet, make it 1 (why...?)
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numKeys = 1
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var buf bytes.Buffer
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err = binary.Write(&buf, binary.BigEndian, numKeys)
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if err != nil {
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return err
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}
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err = sta.Put(KEYNumKeys, buf.Bytes())
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if err != nil {
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return err
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}
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}
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return nil
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})
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if err != nil {
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return err
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}
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return ts.PopulateAdrs(numKeys)
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}
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// NewAdr creates a new, never before seen address, and increments the
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// DB counter as well as putting it in the ram Adrs store, and returns it
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func (ts *TxStore) NewAdr() (*btcutil.AddressPubKeyHash, error) {
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if ts.Param == nil {
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return nil, fmt.Errorf("nil param")
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}
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n := uint32(len(ts.Adrs))
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priv, err := ts.rootPrivKey.Child(n + hdkeychain.HardenedKeyStart)
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if err != nil {
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return nil, err
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}
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newAdr, err := priv.Address(ts.Param)
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if err != nil {
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return nil, err
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}
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// total number of keys (now +1) into 4 bytes
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var buf bytes.Buffer
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err = binary.Write(&buf, binary.BigEndian, n+1)
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if err != nil {
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return nil, err
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}
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// write to db file
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err = ts.StateDB.Update(func(btx *bolt.Tx) error {
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sta := btx.Bucket(BKTState)
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return sta.Put(KEYNumKeys, buf.Bytes())
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})
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if err != nil {
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return nil, err
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}
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// add in to ram.
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var ma MyAdr
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ma.PkhAdr = newAdr
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ma.KeyIdx = n
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ts.Adrs = append(ts.Adrs, ma)
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return newAdr, nil
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}
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// SetBDay sets the birthday (birth height) of the db (really keyfile)
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func (ts *TxStore) SetDBSyncHeight(n int32) error {
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var buf bytes.Buffer
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_ = binary.Write(&buf, binary.BigEndian, n)
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return ts.StateDB.Update(func(btx *bolt.Tx) error {
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sta := btx.Bucket(BKTState)
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return sta.Put(KEYTipHeight, buf.Bytes())
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})
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}
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// SyncHeight returns the chain height to which the db has synced
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func (ts *TxStore) GetDBSyncHeight() (int32, error) {
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var n int32
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err := ts.StateDB.View(func(btx *bolt.Tx) error {
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sta := btx.Bucket(BKTState)
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if sta == nil {
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return fmt.Errorf("no state")
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}
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t := sta.Get(KEYTipHeight)
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if t == nil { // no height written, so 0
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return nil
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}
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// read 4 byte tip height to n
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err := binary.Read(bytes.NewBuffer(t), binary.BigEndian, &n)
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if err != nil {
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return err
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}
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return nil
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})
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if err != nil {
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return 0, err
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}
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return n, nil
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}
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// NumUtxos returns the number of utxos in the DB.
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func (ts *TxStore) NumUtxos() (uint32, error) {
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var n uint32
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err := ts.StateDB.View(func(btx *bolt.Tx) error {
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duf := btx.Bucket(BKTUtxos)
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if duf == nil {
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return fmt.Errorf("no duffel bag")
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}
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stats := duf.Stats()
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n = uint32(stats.KeyN)
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return nil
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})
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if err != nil {
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return 0, err
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}
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return n, nil
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}
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func (ts *TxStore) GetAllUtxos() ([]*Utxo, error) {
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var utxos []*Utxo
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err := ts.StateDB.View(func(btx *bolt.Tx) error {
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duf := btx.Bucket(BKTUtxos)
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if duf == nil {
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return fmt.Errorf("no duffel bag")
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}
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return duf.ForEach(func(k, v []byte) error {
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// have to copy k and v here, otherwise append will crash it.
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// not quite sure why but append does weird stuff I guess.
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// create a new utxo
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x := make([]byte, len(k)+len(v))
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copy(x, k)
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copy(x[len(k):], v)
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newU, err := UtxoFromBytes(x)
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if err != nil {
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return err
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}
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// and add it to ram
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utxos = append(utxos, &newU)
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return nil
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})
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return nil
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})
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if err != nil {
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return nil, err
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}
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return utxos, nil
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}
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// PopulateAdrs just puts a bunch of adrs in ram; it doesn't touch the DB
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func (ts *TxStore) PopulateAdrs(lastKey uint32) error {
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for k := uint32(0); k < lastKey; k++ {
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priv, err := ts.rootPrivKey.Child(k + hdkeychain.HardenedKeyStart)
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if err != nil {
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return err
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}
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newAdr, err := priv.Address(ts.Param)
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if err != nil {
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return err
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}
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var ma MyAdr
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ma.PkhAdr = newAdr
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ma.KeyIdx = k
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ts.Adrs = append(ts.Adrs, ma)
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}
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return nil
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}
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// Ingest puts a tx into the DB atomically. This can result in a
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// gain, a loss, or no result. Gain or loss in satoshis is returned.
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func (ts *TxStore) Ingest(tx *wire.MsgTx) (uint32, error) {
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var hits uint32
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var err error
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var spentOPs [][]byte
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var nUtxoBytes [][]byte
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// first check that we have a height and tx has been SPV OK'd
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inTxid := tx.TxSha()
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height, ok := ts.OKTxids[inTxid]
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if !ok {
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return hits, fmt.Errorf("Ingest error: tx %s not in OKTxids.",
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inTxid.String())
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}
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// tx has been OK'd by SPV; check tx sanity
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utilTx := btcutil.NewTx(tx) // convert for validation
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// checks stuff like inputs >= ouputs
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err = blockchain.CheckTransactionSanity(utilTx)
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if err != nil {
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return hits, err
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}
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// note that you can't check signatures; this is SPV.
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// 0 conf SPV means pretty much nothing. Anyone can say anything.
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// before entering into db, serialize all inputs of the ingested tx
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for _, txin := range tx.TxIn {
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nOP, err := outPointToBytes(&txin.PreviousOutPoint)
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if err != nil {
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return hits, err
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}
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spentOPs = append(spentOPs, nOP)
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}
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// also generate PKscripts for all addresses (maybe keep storing these?)
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for _, adr := range ts.Adrs {
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// iterate through all our addresses
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aPKscript, err := txscript.PayToAddrScript(adr.PkhAdr)
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if err != nil {
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return hits, err
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}
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// iterate through all outputs of this tx
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for i, out := range tx.TxOut {
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if bytes.Equal(out.PkScript, aPKscript) { // new utxo for us
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var newu Utxo
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newu.AtHeight = height
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newu.KeyIdx = adr.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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b, err := newu.ToBytes()
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if err != nil {
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return hits, err
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}
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nUtxoBytes = append(nUtxoBytes, b)
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hits++
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break // only one match
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}
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}
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}
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err = ts.StateDB.Update(func(btx *bolt.Tx) error {
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// get all 4 buckets
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duf := btx.Bucket(BKTUtxos)
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// sta := btx.Bucket(BKTState)
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old := btx.Bucket(BKTStxos)
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txns := btx.Bucket(BKTTxns)
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// first see if we lose utxos
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// iterate through duffel bag and look for matches
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// this makes us lose money, which is regrettable, but we need to know.
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for _, nOP := range spentOPs {
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duf.ForEach(func(k, v []byte) error {
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if bytes.Equal(k, nOP) { // matched, we lost utxo
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// do all this just to figure out value we lost
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x := make([]byte, len(k)+len(v))
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copy(x, k)
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copy(x[len(k):], v)
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lostTxo, err := UtxoFromBytes(x)
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if err != nil {
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return err
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}
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hits++
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// then delete the utxo from duf, save to old
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err = duf.Delete(k)
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if err != nil {
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return err
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}
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// after deletion, save stxo to old bucket
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var st Stxo // generate spent txo
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st.Utxo = lostTxo // assign outpoint
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st.SpendHeight = height // spent at height
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st.SpendTxid = tx.TxSha() // spent by txid
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stxb, err := st.ToBytes() // serialize
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if err != nil {
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return err
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}
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err = old.Put(k, stxb) // write k:v outpoint:stxo bytes
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if err != nil {
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return err
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}
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// store this relevant tx
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sha := tx.TxSha()
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var buf bytes.Buffer
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tx.Serialize(&buf)
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err = txns.Put(sha.Bytes(), buf.Bytes())
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if err != nil {
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return err
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}
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return nil // matched utxo k, won't match another
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}
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return nil // no match
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})
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} // done losing utxos, next gain utxos
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// next add all new utxos to db, this is quick as the work is above
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for _, ub := range nUtxoBytes {
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err = duf.Put(ub[:36], ub[36:])
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if err != nil {
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return err
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}
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}
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return nil
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})
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return hits, err
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}
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