lbcd/ldb/dbcache.go

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// Copyright (c) 2013 Conformal Systems LLC.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package ldb
import (
"bytes"
"github.com/conformal/btcdb"
"github.com/conformal/btcutil"
"github.com/conformal/btcwire"
)
// FetchBlockBySha - return a btcutil Block, object may be a cached.
func (db *LevelDb) FetchBlockBySha(sha *btcwire.ShaHash) (blk *btcutil.Block, err error) {
db.dbLock.Lock()
defer db.dbLock.Unlock()
return db.fetchBlockBySha(sha)
}
// fetchBlockBySha - return a btcutil Block, object may be a cached.
// Must be called with db lock held.
func (db *LevelDb) fetchBlockBySha(sha *btcwire.ShaHash) (blk *btcutil.Block, err error) {
buf, height, err := db.fetchSha(sha)
if err != nil {
return
}
blk, err = btcutil.NewBlockFromBytes(buf)
if err != nil {
return
}
blk.SetHeight(height)
return
}
// FetchTxByShaList given a array of ShaHash, look up the transactions
// and return them in a TxListReply array.
func (db *LevelDb) FetchTxByShaList(txShaList []*btcwire.ShaHash) []*btcdb.TxListReply {
db.dbLock.Lock()
defer db.dbLock.Unlock()
replies := make([]*btcdb.TxListReply, len(txShaList))
for i, txsha := range txShaList {
tx, _, _, _, height, txspent, err := db.fetchTxDataBySha(txsha)
btxspent := []bool{}
if err == nil {
btxspent = make([]bool, len(tx.TxOut), len(tx.TxOut))
for idx := range tx.TxOut {
byteidx := idx / 8
byteoff := uint(idx % 8)
btxspent[idx] = (txspent[byteidx] & (byte(1) << byteoff)) != 0
}
}
txlre := btcdb.TxListReply{Sha: txsha, Tx: tx, Height: height, TxSpent: btxspent, Err: err}
replies[i] = &txlre
}
return replies
}
// fetchTxDataBySha returns several pieces of data regarding the given sha.
func (db *LevelDb) fetchTxDataBySha(txsha *btcwire.ShaHash) (rtx *btcwire.MsgTx, rtxbuf []byte, rpver uint32, rblksha *btcwire.ShaHash, rheight int64, rtxspent []byte, err error) {
var pver uint32
var blksha *btcwire.ShaHash
var blkHeight int64
var txspent []byte
var txOff, txLen int
var blkbuf []byte
blkHeight, txOff, txLen, txspent, err = db.getTxData(txsha)
if err != nil {
err = btcdb.TxShaMissing
return
}
blksha, blkbuf, err = db.getBlkByHeight(blkHeight)
if err != nil {
return
}
//log.Trace("transaction %v is at block %v %v txoff %v, txlen %v\n",
// txsha, blksha, blkHeight, txOff, txLen)
txbuf := make([]byte, txLen)
copy(txbuf[:], blkbuf[txOff:txOff+txLen])
rbuf := bytes.NewBuffer(txbuf)
var tx btcwire.MsgTx
err = tx.Deserialize(rbuf)
if err != nil {
log.Warnf("unable to decode tx block %v %v txoff %v txlen %v",
blkHeight, blksha, txOff, txLen)
return
}
return &tx, txbuf, pver, blksha, blkHeight, txspent, nil
}
// FetchTxAllBySha returns several pieces of data regarding the given sha.
func (db *LevelDb) FetchTxAllBySha(txsha *btcwire.ShaHash) (rtx *btcwire.MsgTx, rtxbuf []byte, rpver uint32, rblksha *btcwire.ShaHash, err error) {
db.dbLock.Lock()
defer db.dbLock.Unlock()
tx, txbuf, pver, blksha, _, _, err := db.fetchTxDataBySha(txsha)
return tx, txbuf, pver, blksha, err
}
// FetchTxBySha returns some data for the given Tx Sha.
func (db *LevelDb) FetchTxBySha(txsha *btcwire.ShaHash) (rtx *btcwire.MsgTx, rpver uint32, blksha *btcwire.ShaHash, err error) {
rtx, _, rpver, blksha, err = db.FetchTxAllBySha(txsha)
return
}
// FetchTxBufBySha return the bytestream data and associated protocol version.
// for the given Tx Sha
func (db *LevelDb) FetchTxBufBySha(txsha *btcwire.ShaHash) (txbuf []byte, rpver uint32, err error) {
_, txbuf, rpver, _, err = db.FetchTxAllBySha(txsha)
return
}
// InvalidateTxCache clear/release all cached transactions.
func (db *LevelDb) InvalidateTxCache() {
}
// InvalidateTxCache clear/release all cached blocks.
func (db *LevelDb) InvalidateBlockCache() {
}
// InvalidateCache clear/release all cached blocks and transactions.
func (db *LevelDb) InvalidateCache() {
}