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105 lines
2.4 KiB
105 lines
2.4 KiB
package blocks
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import (
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"bytes"
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"encoding/binary"
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"encoding/json"
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"github.com/syndtr/goleveldb/leveldb"
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"github.com/syndtr/goleveldb/leveldb/opt"
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. "github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/common"
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)
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var (
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blockStoreKey = []byte("blockStore")
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)
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//-----------------------------------------------------------------------------
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type BlockStoreJSON struct {
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Height uint32
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}
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func (bsj BlockStoreJSON) Save(db *leveldb.DB) {
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bytes, err := json.Marshal(bsj)
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if err != nil {
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Panicf("Could not marshal state bytes: %v", err)
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}
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db.Put(blockStoreKey, bytes, nil)
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}
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func LoadBlockStoreJSON(db *leveldb.DB) BlockStoreJSON {
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bytes, err := db.Get(blockStoreKey, nil)
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if err != nil {
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Panicf("Could not load BlockStoreJSON from db: %v", err)
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}
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if bytes == nil {
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return BlockStoreJSON{
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Height: 0,
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}
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}
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bsj := BlockStoreJSON{}
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err = json.Unmarshal(bytes, &bsj)
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if err != nil {
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Panicf("Could not unmarshal bytes: %X", bytes)
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}
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return bsj
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}
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//-----------------------------------------------------------------------------
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/*
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Simple low level store for blocks, which is actually stored as separte parts (wire format).
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*/
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type BlockStore struct {
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height uint32
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db *leveldb.DB
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}
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func NewBlockStore(db *leveldb.DB) *BlockStore {
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bsjson := LoadBlockStoreJSON(db)
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return &BlockStore{
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height: bsjson.Height,
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db: db,
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}
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}
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// Height() returns the last known contiguous block height.
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func (bs *BlockStore) Height() uint32 {
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return bs.height
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}
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func (bs *BlockStore) LoadBlock(height uint32) *Block {
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blockBytes, err := bs.db.Get(calcBlockKey(height), nil)
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if err != nil {
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Panicf("Could not load block: %v", err)
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}
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if blockBytes == nil {
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return nil
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}
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var n int64
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return ReadBlock(bytes.NewReader(blockBytes), &n, &err)
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}
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// Writes are synchronous and atomic.
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func (bs *BlockStore) SaveBlock(block *Block) error {
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height := block.Height
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if height != bs.height+1 {
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return Errorf("BlockStore can only save contiguous blocks. Wanted %v, got %v", bs.height+1, height)
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}
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// Save block
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blockBytes := BinaryBytes(block)
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err := bs.db.Put(calcBlockKey(height), blockBytes, &opt.WriteOptions{Sync: true})
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// Save new BlockStoreJSON descriptor
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BlockStoreJSON{Height: height}.Save(bs.db)
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return err
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}
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//-----------------------------------------------------------------------------
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func calcBlockKey(height uint32) []byte {
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buf := [9]byte{'B'}
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binary.BigEndian.PutUint32(buf[1:9], height)
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return buf[:]
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}
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