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