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247 lines
7.5 KiB
247 lines
7.5 KiB
package blockchain
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import (
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"fmt"
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"sync"
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cmn "github.com/tendermint/tendermint/libs/common"
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dbm "github.com/tendermint/tendermint/libs/db"
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"github.com/tendermint/tendermint/types"
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)
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/*
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BlockStore is a 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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- Commit: The commit part of each block, for gossiping precommit votes
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Currently the precommit signatures are duplicated in the Block parts as
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well as the Commit. In the future this may change, perhaps by moving
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the Commit data outside the Block. (TODO)
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// NOTE: BlockStore methods will panic if they encounter errors
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// deserializing loaded data, indicating probable corruption on disk.
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*/
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type BlockStore struct {
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db dbm.DB
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mtx sync.RWMutex
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height int64
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}
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// NewBlockStore returns a new BlockStore with the given DB,
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// initialized to the last height that was committed to the DB.
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func NewBlockStore(db dbm.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() int64 {
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bs.mtx.RLock()
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defer bs.mtx.RUnlock()
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return bs.height
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}
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// LoadBlock returns the block with the given height.
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// If no block is found for that height, it returns nil.
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func (bs *BlockStore) LoadBlock(height int64) *types.Block {
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var blockMeta = bs.LoadBlockMeta(height)
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if blockMeta == nil {
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return nil
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}
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var block = new(types.Block)
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buf := []byte{}
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for i := 0; i < blockMeta.BlockID.PartsHeader.Total; i++ {
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part := bs.LoadBlockPart(height, i)
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buf = append(buf, part.Bytes...)
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}
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err := cdc.UnmarshalBinaryLengthPrefixed(buf, block)
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if err != nil {
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// NOTE: The existence of meta should imply the existence of the
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// block. So, make sure meta is only saved after blocks are saved.
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panic(cmn.ErrorWrap(err, "Error reading block"))
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}
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return block
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}
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// LoadBlockPart returns the Part at the given index
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// from the block at the given height.
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// If no part is found for the given height and index, it returns nil.
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func (bs *BlockStore) LoadBlockPart(height int64, index int) *types.Part {
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var part = new(types.Part)
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bz := bs.db.Get(calcBlockPartKey(height, index))
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if len(bz) == 0 {
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return nil
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}
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err := cdc.UnmarshalBinaryBare(bz, part)
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if err != nil {
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panic(cmn.ErrorWrap(err, "Error reading block part"))
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}
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return part
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}
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// LoadBlockMeta returns the BlockMeta for the given height.
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// If no block is found for the given height, it returns nil.
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func (bs *BlockStore) LoadBlockMeta(height int64) *types.BlockMeta {
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var blockMeta = new(types.BlockMeta)
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bz := bs.db.Get(calcBlockMetaKey(height))
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if len(bz) == 0 {
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return nil
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}
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err := cdc.UnmarshalBinaryBare(bz, blockMeta)
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if err != nil {
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panic(cmn.ErrorWrap(err, "Error reading block meta"))
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}
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return blockMeta
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}
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// LoadBlockCommit returns the Commit for the given height.
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// This commit consists of the +2/3 and other Precommit-votes for block at `height`,
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// and it comes from the block.LastCommit for `height+1`.
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// If no commit is found for the given height, it returns nil.
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func (bs *BlockStore) LoadBlockCommit(height int64) *types.Commit {
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var commit = new(types.Commit)
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bz := bs.db.Get(calcBlockCommitKey(height))
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if len(bz) == 0 {
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return nil
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}
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err := cdc.UnmarshalBinaryBare(bz, commit)
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if err != nil {
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panic(cmn.ErrorWrap(err, "Error reading block commit"))
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}
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return commit
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}
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// LoadSeenCommit returns the locally seen Commit for the given height.
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// This is useful when we've seen a commit, but there has not yet been
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// a new block at `height + 1` that includes this commit in its block.LastCommit.
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func (bs *BlockStore) LoadSeenCommit(height int64) *types.Commit {
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var commit = new(types.Commit)
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bz := bs.db.Get(calcSeenCommitKey(height))
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if len(bz) == 0 {
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return nil
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}
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err := cdc.UnmarshalBinaryBare(bz, commit)
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if err != nil {
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panic(cmn.ErrorWrap(err, "Error reading block seen commit"))
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}
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return commit
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}
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// SaveBlock persists the given block, blockParts, and seenCommit to the underlying db.
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// blockParts: Must be parts of the block
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// seenCommit: The +2/3 precommits that were seen which committed at height.
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// If all the nodes restart after committing a block,
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// we need this to reload the precommits to catch-up nodes to the
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// most recent height. Otherwise they'd stall at H-1.
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func (bs *BlockStore) SaveBlock(block *types.Block, blockParts *types.PartSet, seenCommit *types.Commit) {
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if block == nil {
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panic("BlockStore can only save a non-nil block")
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}
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height := block.Height
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if g, w := height, bs.Height()+1; g != w {
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panic(fmt.Sprintf("BlockStore can only save contiguous blocks. Wanted %v, got %v", w, g))
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}
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if !blockParts.IsComplete() {
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panic(fmt.Sprintf("BlockStore can only save complete block part sets"))
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}
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// Save block meta
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blockMeta := types.NewBlockMeta(block, blockParts)
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metaBytes := cdc.MustMarshalBinaryBare(blockMeta)
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bs.db.Set(calcBlockMetaKey(height), metaBytes)
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// Save block parts
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for i := 0; i < blockParts.Total(); i++ {
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part := blockParts.GetPart(i)
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bs.saveBlockPart(height, i, part)
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}
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// Save block commit (duplicate and separate from the Block)
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blockCommitBytes := cdc.MustMarshalBinaryBare(block.LastCommit)
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bs.db.Set(calcBlockCommitKey(height-1), blockCommitBytes)
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// Save seen commit (seen +2/3 precommits for block)
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// NOTE: we can delete this at a later height
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seenCommitBytes := cdc.MustMarshalBinaryBare(seenCommit)
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bs.db.Set(calcSeenCommitKey(height), seenCommitBytes)
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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.mtx.Lock()
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bs.height = height
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bs.mtx.Unlock()
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// Flush
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bs.db.SetSync(nil, nil)
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}
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func (bs *BlockStore) saveBlockPart(height int64, index int, part *types.Part) {
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if height != bs.Height()+1 {
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panic(fmt.Sprintf("BlockStore can only save contiguous blocks. Wanted %v, got %v", bs.Height()+1, height))
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}
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partBytes := cdc.MustMarshalBinaryBare(part)
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bs.db.Set(calcBlockPartKey(height, index), partBytes)
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}
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//-----------------------------------------------------------------------------
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func calcBlockMetaKey(height int64) []byte {
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return []byte(fmt.Sprintf("H:%v", height))
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}
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func calcBlockPartKey(height int64, partIndex int) []byte {
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return []byte(fmt.Sprintf("P:%v:%v", height, partIndex))
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}
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func calcBlockCommitKey(height int64) []byte {
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return []byte(fmt.Sprintf("C:%v", height))
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}
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func calcSeenCommitKey(height int64) []byte {
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return []byte(fmt.Sprintf("SC:%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 int64 `json:"height"`
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}
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// Save persists the blockStore state to the database as JSON.
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func (bsj BlockStoreStateJSON) Save(db dbm.DB) {
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bytes, err := cdc.MarshalJSON(bsj)
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if err != nil {
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panic(fmt.Sprintf("Could not marshal state bytes: %v", err))
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}
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db.SetSync(blockStoreKey, bytes)
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}
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// LoadBlockStoreStateJSON returns the BlockStoreStateJSON as loaded from disk.
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// If no BlockStoreStateJSON was previously persisted, it returns the zero value.
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func LoadBlockStoreStateJSON(db dbm.DB) BlockStoreStateJSON {
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bytes := db.Get(blockStoreKey)
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if len(bytes) == 0 {
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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 := cdc.UnmarshalJSON(bytes, &bsj)
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if err != nil {
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panic(fmt.Sprintf("Could not unmarshal bytes: %X", bytes))
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}
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return bsj
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}
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