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197 lines
5.1 KiB
197 lines
5.1 KiB
package block
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import (
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"bytes"
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"encoding/json"
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"fmt"
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. "github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/common"
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db_ "github.com/tendermint/tendermint/db"
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)
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/*
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Simple low level store for blocks.
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There are three types of information stored:
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- BlockMeta: Meta information about each block
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- Block part: Parts of each block, aggregated w/ PartSet
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- Validation: The Validation part of each block, for gossiping commit votes
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Currently the commit signatures are duplicated in the Block parts as
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well as the Validation. In the future this may change, perhaps by moving
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the Validation data outside the Block.
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*/
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type BlockStore struct {
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height uint
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db db_.DB
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}
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func NewBlockStore(db db_.DB) *BlockStore {
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bsjson := LoadBlockStoreStateJSON(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() uint {
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return bs.height
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}
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func (bs *BlockStore) GetReader(key []byte) Unreader {
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bytez := bs.db.Get(key)
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if bytez == nil {
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return nil
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}
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return bytes.NewReader(bytez)
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}
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func (bs *BlockStore) LoadBlock(height uint) *Block {
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var n int64
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var err error
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meta := ReadBinary(&BlockMeta{}, bs.GetReader(calcBlockMetaKey(height)), &n, &err).(*BlockMeta)
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if err != nil {
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panic(Fmt("Error reading block meta: %v", err))
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}
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bytez := []byte{}
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for i := uint(0); i < meta.Parts.Total; i++ {
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part := bs.LoadBlockPart(height, i)
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bytez = append(bytez, part.Bytes...)
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}
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block := ReadBinary(&Block{}, bytes.NewReader(bytez), &n, &err).(*Block)
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if err != nil {
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panic(Fmt("Error reading block: %v", err))
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}
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return block
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}
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func (bs *BlockStore) LoadBlockPart(height uint, index uint) *Part {
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var n int64
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var err error
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part := ReadBinary(&Part{}, bs.GetReader(calcBlockPartKey(height, index)), &n, &err).(*Part)
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if err != nil {
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panic(Fmt("Error reading block part: %v", err))
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}
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return part
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}
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func (bs *BlockStore) LoadBlockMeta(height uint) *BlockMeta {
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var n int64
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var err error
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meta := ReadBinary(&BlockMeta{}, bs.GetReader(calcBlockMetaKey(height)), &n, &err).(*BlockMeta)
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if err != nil {
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panic(Fmt("Error reading block meta: %v", err))
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}
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return meta
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}
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func (bs *BlockStore) LoadBlockValidation(height uint) *Validation {
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var n int64
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var err error
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validation := ReadBinary(&Validation{}, bs.GetReader(calcBlockValidationKey(height)), &n, &err).(*Validation)
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if err != nil {
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panic(Fmt("Error reading validation: %v", err))
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}
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return validation
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}
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func (bs *BlockStore) SaveBlock(block *Block, blockParts *PartSet) {
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height := block.Height
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if height != bs.height+1 {
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panic(Fmt("BlockStore can only save contiguous blocks. Wanted %v, got %v", bs.height+1, height))
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}
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if !blockParts.IsComplete() {
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panic(Fmt("BlockStore can only save complete block part sets"))
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}
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// Save block meta
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meta := makeBlockMeta(block, blockParts)
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metaBytes := BinaryBytes(meta)
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bs.db.Set(calcBlockMetaKey(height), metaBytes)
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// Save block parts
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for i := uint(0); i < blockParts.Total(); i++ {
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bs.saveBlockPart(height, i, blockParts.GetPart(i))
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}
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// Save block validation (duplicate and separate)
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validationBytes := BinaryBytes(block.Validation)
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bs.db.Set(calcBlockValidationKey(height), validationBytes)
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// Save new BlockStoreStateJSON descriptor
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BlockStoreStateJSON{Height: height}.Save(bs.db)
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// Done!
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bs.height = height
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}
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func (bs *BlockStore) saveBlockPart(height uint, index uint, part *Part) {
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if height != bs.height+1 {
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panic(Fmt("BlockStore can only save contiguous blocks. Wanted %v, got %v", bs.height+1, height))
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}
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partBytes := BinaryBytes(part)
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bs.db.Set(calcBlockPartKey(height, index), partBytes)
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}
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//-----------------------------------------------------------------------------
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type BlockMeta struct {
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Hash []byte // The block hash
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Header *Header // The block's Header
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Parts PartSetHeader // The PartSetHeader, for transfer
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}
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func makeBlockMeta(block *Block, blockParts *PartSet) *BlockMeta {
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return &BlockMeta{
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Hash: block.Hash(),
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Header: block.Header,
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Parts: blockParts.Header(),
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}
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}
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//-----------------------------------------------------------------------------
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func calcBlockMetaKey(height uint) []byte {
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return []byte(fmt.Sprintf("H:%v", height))
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}
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func calcBlockPartKey(height uint, partIndex uint) []byte {
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return []byte(fmt.Sprintf("P:%v:%v", height, partIndex))
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}
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func calcBlockValidationKey(height uint) []byte {
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return []byte(fmt.Sprintf("V:%v", height))
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}
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//-----------------------------------------------------------------------------
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var blockStoreKey = []byte("blockStore")
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type BlockStoreStateJSON struct {
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Height uint
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}
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func (bsj BlockStoreStateJSON) Save(db db_.DB) {
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bytes, err := json.Marshal(bsj)
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if err != nil {
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panic(Fmt("Could not marshal state bytes: %v", err))
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}
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db.Set(blockStoreKey, bytes)
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}
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func LoadBlockStoreStateJSON(db db_.DB) BlockStoreStateJSON {
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bytes := db.Get(blockStoreKey)
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if bytes == nil {
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return BlockStoreStateJSON{
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Height: 0,
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}
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}
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bsj := BlockStoreStateJSON{}
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err := json.Unmarshal(bytes, &bsj)
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if err != nil {
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panic(Fmt("Could not unmarshal bytes: %X", bytes))
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}
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return bsj
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}
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