// ConnectBlock is invoked by the index manager when a new block has been
// connected to the main chain. This indexer adds a mapping for each address
// the transactions in the block involve.
//
// This is part of the Indexer interface.
func (idx *AddrIndex) ConnectBlock(dbTx database.Tx, block *btcutil.Block, view *blockchain.UtxoViewpoint) error {
// The offset and length of the transactions within the serialized
// block.
txLocs, err := block.TxLoc()
if err != nil {
return err
}
// Get the internal block ID associated with the block.
blockID, err := dbFetchBlockIDByHash(dbTx, block.Hash())
if err != nil {
return err
}
// Build all of the address to transaction mappings in a local map.
addrsToTxns := make(writeIndexData)
idx.indexBlock(addrsToTxns, block, view)
// Add all of the index entries for each address.
addrIdxBucket := dbTx.Metadata().Bucket(addrIndexKey)
for addrKey, txIdxs := range addrsToTxns {
for _, txIdx := range txIdxs {
err := dbPutAddrIndexEntry(addrIdxBucket, addrKey,
blockID, txLocs[txIdx])
if err != nil {
return err
}
}
}
return nil
}
// dbFetchTx looks up the passed transaction hash in the transaction index and
// loads it from the database.
func dbFetchTx(dbTx database.Tx, hash *wire.ShaHash) (*wire.MsgTx, error) {
// Look up the location of the transaction.
blockRegion, err := dbFetchTxIndexEntry(dbTx, hash)
if err != nil {
return nil, err
}
if blockRegion == nil {
return nil, fmt.Errorf("transaction %v not found", hash)
}
// Load the raw transaction bytes from the database.
txBytes, err := dbTx.FetchBlockRegion(blockRegion)
if err != nil {
return nil, err
}
// Deserialize the transaction.
var msgTx wire.MsgTx
err = msgTx.Deserialize(bytes.NewReader(txBytes))
if err != nil {
return nil, err
}
return &msgTx, nil
}
// TxRegionsForAddress returns a slice of block regions which identify each
// transaction that involves the passed address according to the specified
// number to skip, number requested, and whether or not the results should be
// reversed. It also returns the number actually skipped since it could be less
// in the case where there are not enough entries.
//
// NOTE: These results only include transactions confirmed in blocks. See the
// UnconfirmedTxnsForAddress method for obtaining unconfirmed transactions
// that involve a given address.
//
// This function is safe for concurrent access.
func (idx *AddrIndex) TxRegionsForAddress(dbTx database.Tx, addr btcutil.Address, numToSkip, numRequested uint32, reverse bool) ([]database.BlockRegion, uint32, error) {
addrKey, err := addrToKey(addr)
if err != nil {
return nil, 0, err
}
var regions []database.BlockRegion
var skipped uint32
err = idx.db.View(func(dbTx database.Tx) error {
// Create closure to lookup the block hash given the ID using
// the database transaction.
fetchBlockHash := func(id []byte) (*chainhash.Hash, error) {
// Deserialize and populate the result.
return dbFetchBlockHashBySerializedID(dbTx, id)
}
var err error
addrIdxBucket := dbTx.Metadata().Bucket(addrIndexKey)
regions, skipped, err = dbFetchAddrIndexEntries(addrIdxBucket,
addrKey, numToSkip, numRequested, reverse,
fetchBlockHash)
return err
})
return regions, skipped, err
}
// maybeCreateIndexes determines if each of the enabled indexes have already
// been created and creates them if not.
func (m *Manager) maybeCreateIndexes(dbTx database.Tx) error {
indexesBucket := dbTx.Metadata().Bucket(indexTipsBucketName)
for _, indexer := range m.enabledIndexes {
// Nothing to do if the index tip already exists.
idxKey := indexer.Key()
if indexesBucket.Get(idxKey) != nil {
continue
}
// The tip for the index does not exist, so create it and
// invoke the create callback for the index so it can perform
// any one-time initialization it requires.
if err := indexer.Create(dbTx); err != nil {
return err
}
// Set the tip for the index to values which represent an
// uninitialized index.
err := dbPutIndexerTip(dbTx, idxKey, &wire.ShaHash{}, -1)
if err != nil {
return err
}
}
return nil
}
// dbFetchUtxoEntry uses an existing database transaction to fetch all unspent
// outputs for the provided Bitcoin transaction hash from the utxo set.
//
// When there is no entry for the provided hash, nil will be returned for the
// both the entry and the error.
func dbFetchUtxoEntry(dbTx database.Tx, hash *chainhash.Hash) (*UtxoEntry, error) {
// Fetch the unspent transaction output information for the passed
// transaction hash. Return now when there is no entry.
utxoBucket := dbTx.Metadata().Bucket(utxoSetBucketName)
serializedUtxo := utxoBucket.Get(hash[:])
if serializedUtxo == nil {
return nil, nil
}
// A non-nil zero-length entry means there is an entry in the database
// for a fully spent transaction which should never be the case.
if len(serializedUtxo) == 0 {
return nil, AssertError(fmt.Sprintf("database contains entry "+
"for fully spent tx %v", hash))
}
// Deserialize the utxo entry and return it.
entry, err := deserializeUtxoEntry(serializedUtxo)
if err != nil {
// Ensure any deserialization errors are returned as database
// corruption errors.
if isDeserializeErr(err) {
return nil, database.Error{
ErrorCode: database.ErrCorruption,
Description: fmt.Sprintf("corrupt utxo entry "+
"for %v: %v", hash, err),
}
}
return nil, err
}
return entry, nil
}
// dbFetchTxIndexEntry uses an existing database transaction to fetch the block
// region for the provided transaction hash from the transaction index. When
// there is no entry for the provided hash, nil will be returned for the both
// the region and the error.
func dbFetchTxIndexEntry(dbTx database.Tx, txHash *chainhash.Hash) (*database.BlockRegion, error) {
// Load the record from the database and return now if it doesn't exist.
txIndex := dbTx.Metadata().Bucket(txIndexKey)
serializedData := txIndex.Get(txHash[:])
if len(serializedData) == 0 {
return nil, nil
}
// Ensure the serialized data has enough bytes to properly deserialize.
if len(serializedData) < 12 {
return nil, database.Error{
ErrorCode: database.ErrCorruption,
Description: fmt.Sprintf("corrupt transaction index "+
"entry for %s", txHash),
}
}
// Load the block hash associated with the block ID.
hash, err := dbFetchBlockHashBySerializedID(dbTx, serializedData[0:4])
if err != nil {
return nil, database.Error{
ErrorCode: database.ErrCorruption,
Description: fmt.Sprintf("corrupt transaction index "+
"entry for %s: %v", txHash, err),
}
}
// Deserialize the final entry.
region := database.BlockRegion{Hash: &chainhash.Hash{}}
copy(region.Hash[:], hash[:])
region.Offset = byteOrder.Uint32(serializedData[4:8])
region.Len = byteOrder.Uint32(serializedData[8:12])
return ®ion, nil
}
// dbPutIndexerTip uses an existing database transaction to update or add the
// current tip for the given index to the provided values.
func dbPutIndexerTip(dbTx database.Tx, idxKey []byte, hash *wire.ShaHash, height int32) error {
serialized := make([]byte, wire.HashSize+4)
copy(serialized, hash[:])
byteOrder.PutUint32(serialized[wire.HashSize:], uint32(height))
indexesBucket := dbTx.Metadata().Bucket(indexTipsBucketName)
return indexesBucket.Put(idxKey, serialized)
}
// dbFetchBlockIDByHash uses an existing database transaction to retrieve the
// block id for the provided hash from the index.
func dbFetchBlockIDByHash(dbTx database.Tx, hash *chainhash.Hash) (uint32, error) {
hashIndex := dbTx.Metadata().Bucket(idByHashIndexBucketName)
serializedID := hashIndex.Get(hash[:])
if serializedID == nil {
return 0, errNoBlockIDEntry
}
return byteOrder.Uint32(serializedID), nil
}
// dbRemoveTxIndexEntry uses an existing database transaction to remove the most
// recent transaction index entry for the given hash.
func dbRemoveTxIndexEntry(dbTx database.Tx, txHash *chainhash.Hash) error {
txIndex := dbTx.Metadata().Bucket(txIndexKey)
serializedData := txIndex.Get(txHash[:])
if len(serializedData) == 0 {
return fmt.Errorf("can't remove non-existent transaction %s "+
"from the transaction index", txHash)
}
return txIndex.Delete(txHash[:])
}
// Create is invoked when the indexer manager determines the index needs
// to be created for the first time. It creates the buckets for the hash-based
// transaction index and the internal block ID indexes.
//
// This is part of the Indexer interface.
func (idx *TxIndex) Create(dbTx database.Tx) error {
meta := dbTx.Metadata()
if _, err := meta.CreateBucket(idByHashIndexBucketName); err != nil {
return err
}
if _, err := meta.CreateBucket(hashByIDIndexBucketName); err != nil {
return err
}
_, err := meta.CreateBucket(txIndexKey)
return err
}
// dbFetchHeightByHash uses an existing database transaction to retrieve the
// height for the provided hash from the index.
func dbFetchHeightByHash(dbTx database.Tx, hash *chainhash.Hash) (int32, error) {
meta := dbTx.Metadata()
hashIndex := meta.Bucket(hashIndexBucketName)
serializedHeight := hashIndex.Get(hash[:])
if serializedHeight == nil {
str := fmt.Sprintf("block %s is not in the main chain", hash)
return 0, errNotInMainChain(str)
}
return int32(byteOrder.Uint32(serializedHeight)), nil
}
// dbFetchBlockHashBySerializedID uses an existing database transaction to
// retrieve the hash for the provided serialized block id from the index.
func dbFetchBlockHashBySerializedID(dbTx database.Tx, serializedID []byte) (*chainhash.Hash, error) {
idIndex := dbTx.Metadata().Bucket(hashByIDIndexBucketName)
hashBytes := idIndex.Get(serializedID)
if hashBytes == nil {
return nil, errNoBlockIDEntry
}
var hash chainhash.Hash
copy(hash[:], hashBytes)
return &hash, nil
}
// dbPutBestState uses an existing database transaction to update the best chain
// state with the given parameters.
func dbPutBestState(dbTx database.Tx, snapshot *BestState, workSum *big.Int) error {
// Serialize the current best chain state.
serializedData := serializeBestChainState(bestChainState{
hash: *snapshot.Hash,
height: uint32(snapshot.Height),
totalTxns: snapshot.TotalTxns,
workSum: workSum,
})
// Store the current best chain state into the database.
return dbTx.Metadata().Put(chainStateKeyName, serializedData)
}
// dbFetchHeaderByHash uses an existing database transaction to retrieve the
// block header for the provided hash.
func dbFetchHeaderByHash(dbTx database.Tx, hash *chainhash.Hash) (*wire.BlockHeader, error) {
headerBytes, err := dbTx.FetchBlockHeader(hash)
if err != nil {
return nil, err
}
var header wire.BlockHeader
err = header.Deserialize(bytes.NewReader(headerBytes))
if err != nil {
return nil, err
}
return &header, nil
}
// dbRemoveBlockIndex uses an existing database transaction remove block index
// entries from the hash to height and height to hash mappings for the provided
// values.
func dbRemoveBlockIndex(dbTx database.Tx, hash *chainhash.Hash, height int32) error {
// Remove the block hash to height mapping.
meta := dbTx.Metadata()
hashIndex := meta.Bucket(hashIndexBucketName)
if err := hashIndex.Delete(hash[:]); err != nil {
return err
}
// Remove the block height to hash mapping.
var serializedHeight [4]byte
byteOrder.PutUint32(serializedHeight[:], uint32(height))
heightIndex := meta.Bucket(heightIndexBucketName)
return heightIndex.Delete(serializedHeight[:])
}
// dbFetchIndexerTip uses an existing database transaction to retrieve the
// hash and height of the current tip for the provided index.
func dbFetchIndexerTip(dbTx database.Tx, idxKey []byte) (*wire.ShaHash, int32, error) {
indexesBucket := dbTx.Metadata().Bucket(indexTipsBucketName)
serialized := indexesBucket.Get(idxKey)
if len(serialized) < wire.HashSize+4 {
return nil, 0, database.Error{
ErrorCode: database.ErrCorruption,
Description: fmt.Sprintf("unexpected end of data for "+
"index %q tip", string(idxKey)),
}
}
var hash wire.ShaHash
copy(hash[:], serialized[:wire.HashSize])
height := int32(byteOrder.Uint32(serialized[wire.HashSize:]))
return &hash, height, nil
}
// DisconnectBlock is invoked by the index manager when a block has been
// disconnected from the main chain. This indexer removes the address mappings
// each transaction in the block involve.
//
// This is part of the Indexer interface.
func (idx *AddrIndex) DisconnectBlock(dbTx database.Tx, block *btcutil.Block, view *blockchain.UtxoViewpoint) error {
// Build all of the address to transaction mappings in a local map.
addrsToTxns := make(writeIndexData)
idx.indexBlock(addrsToTxns, block, view)
// Remove all of the index entries for each address.
bucket := dbTx.Metadata().Bucket(addrIndexKey)
for addrKey, txIdxs := range addrsToTxns {
err := dbRemoveAddrIndexEntries(bucket, addrKey, len(txIdxs))
if err != nil {
return err
}
}
return nil
}
// dbPutBlockIDIndexEntry uses an existing database transaction to update or add
// the index entries for the hash to id and id to hash mappings for the provided
// values.
func dbPutBlockIDIndexEntry(dbTx database.Tx, hash *chainhash.Hash, id uint32) error {
// Serialize the height for use in the index entries.
var serializedID [4]byte
byteOrder.PutUint32(serializedID[:], id)
// Add the block hash to ID mapping to the index.
meta := dbTx.Metadata()
hashIndex := meta.Bucket(idByHashIndexBucketName)
if err := hashIndex.Put(hash[:], serializedID[:]); err != nil {
return err
}
// Add the block ID to hash mapping to the index.
idIndex := meta.Bucket(hashByIDIndexBucketName)
return idIndex.Put(serializedID[:], hash[:])
}
// dbFetchHashByHeight uses an existing database transaction to retrieve the
// hash for the provided height from the index.
func dbFetchHashByHeight(dbTx database.Tx, height int32) (*chainhash.Hash, error) {
var serializedHeight [4]byte
byteOrder.PutUint32(serializedHeight[:], uint32(height))
meta := dbTx.Metadata()
heightIndex := meta.Bucket(heightIndexBucketName)
hashBytes := heightIndex.Get(serializedHeight[:])
if hashBytes == nil {
str := fmt.Sprintf("no block at height %d exists", height)
return nil, errNotInMainChain(str)
}
var hash chainhash.Hash
copy(hash[:], hashBytes)
return &hash, nil
}
// dbRemoveBlockIDIndexEntry uses an existing database transaction remove index
// entries from the hash to id and id to hash mappings for the provided hash.
func dbRemoveBlockIDIndexEntry(dbTx database.Tx, hash *chainhash.Hash) error {
// Remove the block hash to ID mapping.
meta := dbTx.Metadata()
hashIndex := meta.Bucket(idByHashIndexBucketName)
serializedID := hashIndex.Get(hash[:])
if serializedID == nil {
return nil
}
if err := hashIndex.Delete(hash[:]); err != nil {
return err
}
// Remove the block ID to hash mapping.
idIndex := meta.Bucket(hashByIDIndexBucketName)
return idIndex.Delete(serializedID)
}
// dbPutBlockIndex uses an existing database transaction to update or add the
// block index entries for the hash to height and height to hash mappings for
// the provided values.
func dbPutBlockIndex(dbTx database.Tx, hash *chainhash.Hash, height int32) error {
// Serialize the height for use in the index entries.
var serializedHeight [4]byte
byteOrder.PutUint32(serializedHeight[:], uint32(height))
// Add the block hash to height mapping to the index.
meta := dbTx.Metadata()
hashIndex := meta.Bucket(hashIndexBucketName)
if err := hashIndex.Put(hash[:], serializedHeight[:]); err != nil {
return err
}
// Add the block height to hash mapping to the index.
heightIndex := meta.Bucket(heightIndexBucketName)
return heightIndex.Put(serializedHeight[:], hash[:])
}
// dbPutUtxoView uses an existing database transaction to update the utxo set
// in the database based on the provided utxo view contents and state. In
// particular, only the entries that have been marked as modified are written
// to the database.
func dbPutUtxoView(dbTx database.Tx, view *UtxoViewpoint) error {
utxoBucket := dbTx.Metadata().Bucket(utxoSetBucketName)
for txHashIter, entry := range view.entries {
// No need to update the database if the entry was not modified.
if entry == nil || !entry.modified {
continue
}
// Serialize the utxo entry without any entries that have been
// spent.
serialized, err := serializeUtxoEntry(entry)
if err != nil {
return err
}
// Make a copy of the hash because the iterator changes on each
// loop iteration and thus slicing it directly would cause the
// data to change out from under the put/delete funcs below.
txHash := txHashIter
// Remove the utxo entry if it is now fully spent.
if serialized == nil {
if err := utxoBucket.Delete(txHash[:]); err != nil {
return err
}
continue
}
// At this point the utxo entry is not fully spent, so store its
// serialization in the database.
err = utxoBucket.Put(txHash[:], serialized)
if err != nil {
return err
}
}
return nil
}
// dbFetchBlockByHeight uses an existing database transaction to retrieve the
// raw block for the provided height, deserialize it, and return a btcutil.Block
// with the height set.
func dbFetchBlockByHeight(dbTx database.Tx, height int32) (*btcutil.Block, error) {
// First find the hash associated with the provided height in the index.
hash, err := dbFetchHashByHeight(dbTx, height)
if err != nil {
return nil, err
}
// Load the raw block bytes from the database.
blockBytes, err := dbTx.FetchBlock(hash)
if err != nil {
return nil, err
}
// Create the encapsulated block and set the height appropriately.
block, err := btcutil.NewBlockFromBytes(blockBytes)
if err != nil {
return nil, err
}
block.SetHeight(height)
return block, nil
}
// dbFetchSpendJournalEntry fetches the spend journal entry for the passed
// block and deserializes it into a slice of spent txout entries. The provided
// view MUST have the utxos referenced by all of the transactions available for
// the passed block since that information is required to reconstruct the spent
// txouts.
func dbFetchSpendJournalEntry(dbTx database.Tx, block *btcutil.Block, view *UtxoViewpoint) ([]spentTxOut, error) {
// Exclude the coinbase transaction since it can't spend anything.
spendBucket := dbTx.Metadata().Bucket(spendJournalBucketName)
serialized := spendBucket.Get(block.Hash()[:])
blockTxns := block.MsgBlock().Transactions[1:]
stxos, err := deserializeSpendJournalEntry(serialized, blockTxns, view)
if err != nil {
// Ensure any deserialization errors are returned as database
// corruption errors.
if isDeserializeErr(err) {
return nil, database.Error{
ErrorCode: database.ErrCorruption,
Description: fmt.Sprintf("corrupt spend "+
"information for %v: %v", block.Hash(),
err),
}
}
return nil, err
}
return stxos, nil
}
// dbPutTxIndexEntry uses an existing database transaction to update the
// transaction index given the provided serialized data that is expected to have
// been serialized putTxIndexEntry.
func dbPutTxIndexEntry(dbTx database.Tx, txHash *chainhash.Hash, serializedData []byte) error {
txIndex := dbTx.Metadata().Bucket(txIndexKey)
return txIndex.Put(txHash[:], serializedData)
}
// Create is invoked when the indexer manager determines the index needs
// to be created for the first time. It creates the bucket for the address
// index.
//
// This is part of the Indexer interface.
func (idx *AddrIndex) Create(dbTx database.Tx) error {
_, err := dbTx.Metadata().CreateBucket(addrIndexKey)
return err
}
// dbRemoveSpendJournalEntry uses an existing database transaction to remove the
// spend journal entry for the passed block hash.
func dbRemoveSpendJournalEntry(dbTx database.Tx, blockHash *chainhash.Hash) error {
spendBucket := dbTx.Metadata().Bucket(spendJournalBucketName)
return spendBucket.Delete(blockHash[:])
}
// dbPutSpendJournalEntry uses an existing database transaction to update the
// spend journal entry for the given block hash using the provided slice of
// spent txouts. The spent txouts slice must contain an entry for every txout
// the transactions in the block spend in the order they are spent.
func dbPutSpendJournalEntry(dbTx database.Tx, blockHash *chainhash.Hash, stxos []spentTxOut) error {
spendBucket := dbTx.Metadata().Bucket(spendJournalBucketName)
serialized := serializeSpendJournalEntry(stxos)
return spendBucket.Put(blockHash[:], serialized)
}
// dbMainChainHasBlock uses an existing database transaction to return whether
// or not the main chain contains the block identified by the provided hash.
func dbMainChainHasBlock(dbTx database.Tx, hash *chainhash.Hash) bool {
hashIndex := dbTx.Metadata().Bucket(hashIndexBucketName)
return hashIndex.Get(hash[:]) != nil
}