You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
266 lines
7.9 KiB
266 lines
7.9 KiB
package blockchain
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/json"
|
|
"fmt"
|
|
"io"
|
|
"sync"
|
|
|
|
wire "github.com/tendermint/go-wire"
|
|
"github.com/tendermint/tendermint/types"
|
|
cmn "github.com/tendermint/tmlibs/common"
|
|
dbm "github.com/tendermint/tmlibs/db"
|
|
)
|
|
|
|
/*
|
|
BlockStore is a simple low level store for blocks.
|
|
|
|
There are three types of information stored:
|
|
- BlockMeta: Meta information about each block
|
|
- Block part: Parts of each block, aggregated w/ PartSet
|
|
- Commit: The commit part of each block, for gossiping precommit votes
|
|
|
|
Currently the precommit signatures are duplicated in the Block parts as
|
|
well as the Commit. In the future this may change, perhaps by moving
|
|
the Commit data outside the Block. (TODO)
|
|
|
|
// NOTE: BlockStore methods will panic if they encounter errors
|
|
// deserializing loaded data, indicating probable corruption on disk.
|
|
*/
|
|
type BlockStore struct {
|
|
db dbm.DB
|
|
|
|
mtx sync.RWMutex
|
|
height int64
|
|
}
|
|
|
|
// NewBlockStore returns a new BlockStore with the given db,
|
|
// initialized to the last committed height.
|
|
func NewBlockStore(db dbm.DB) *BlockStore {
|
|
bsjson := LoadBlockStoreStateJSON(db)
|
|
return &BlockStore{
|
|
height: bsjson.Height,
|
|
db: db,
|
|
}
|
|
}
|
|
|
|
// Height returns the last known contiguous block height.
|
|
func (bs *BlockStore) Height() int64 {
|
|
bs.mtx.RLock()
|
|
defer bs.mtx.RUnlock()
|
|
return bs.height
|
|
}
|
|
|
|
// GetReader returns the value associated with the given key wrapped in an io.Reader.
|
|
// If no value is found, it returns nil.
|
|
// Its mainly for use with wire.ReadBinary.
|
|
func (bs *BlockStore) GetReader(key []byte) io.Reader {
|
|
bytez := bs.db.Get(key)
|
|
if bytez == nil {
|
|
return nil
|
|
}
|
|
return bytes.NewReader(bytez)
|
|
}
|
|
|
|
// LoadBlock returns the block with the given height.
|
|
// If no block is found for that height, it returns nil.
|
|
func (bs *BlockStore) LoadBlock(height int64) *types.Block {
|
|
var n int
|
|
var err error
|
|
r := bs.GetReader(calcBlockMetaKey(height))
|
|
if r == nil {
|
|
return nil
|
|
}
|
|
blockMeta := wire.ReadBinary(&types.BlockMeta{}, r, 0, &n, &err).(*types.BlockMeta)
|
|
if err != nil {
|
|
cmn.PanicCrisis(cmn.Fmt("Error reading block meta: %v", err))
|
|
}
|
|
bytez := []byte{}
|
|
for i := 0; i < blockMeta.BlockID.PartsHeader.Total; i++ {
|
|
part := bs.LoadBlockPart(height, i)
|
|
bytez = append(bytez, part.Bytes...)
|
|
}
|
|
block := wire.ReadBinary(&types.Block{}, bytes.NewReader(bytez), 0, &n, &err).(*types.Block)
|
|
if err != nil {
|
|
cmn.PanicCrisis(cmn.Fmt("Error reading block: %v", err))
|
|
}
|
|
return block
|
|
}
|
|
|
|
// LoadBlockPart returns the Part at the given index
|
|
// from the block at the given height.
|
|
// If no part is found for the given height and index, it returns nil.
|
|
func (bs *BlockStore) LoadBlockPart(height int64, index int) *types.Part {
|
|
var n int
|
|
var err error
|
|
r := bs.GetReader(calcBlockPartKey(height, index))
|
|
if r == nil {
|
|
return nil
|
|
}
|
|
part := wire.ReadBinary(&types.Part{}, r, 0, &n, &err).(*types.Part)
|
|
if err != nil {
|
|
cmn.PanicCrisis(cmn.Fmt("Error reading block part: %v", err))
|
|
}
|
|
return part
|
|
}
|
|
|
|
// LoadBlockMeta returns the BlockMeta for the given height.
|
|
// If no block is found for the given height, it returns nil.
|
|
func (bs *BlockStore) LoadBlockMeta(height int64) *types.BlockMeta {
|
|
var n int
|
|
var err error
|
|
r := bs.GetReader(calcBlockMetaKey(height))
|
|
if r == nil {
|
|
return nil
|
|
}
|
|
blockMeta := wire.ReadBinary(&types.BlockMeta{}, r, 0, &n, &err).(*types.BlockMeta)
|
|
if err != nil {
|
|
cmn.PanicCrisis(cmn.Fmt("Error reading block meta: %v", err))
|
|
}
|
|
return blockMeta
|
|
}
|
|
|
|
// LoadBlockCommit returns the Commit for the given height.
|
|
// This commit consists of the +2/3 and other Precommit-votes for block at `height`,
|
|
// and it comes from the block.LastCommit for `height+1`.
|
|
// If no commit is found for the given height, it returns nil.
|
|
func (bs *BlockStore) LoadBlockCommit(height int64) *types.Commit {
|
|
var n int
|
|
var err error
|
|
r := bs.GetReader(calcBlockCommitKey(height))
|
|
if r == nil {
|
|
return nil
|
|
}
|
|
commit := wire.ReadBinary(&types.Commit{}, r, 0, &n, &err).(*types.Commit)
|
|
if err != nil {
|
|
cmn.PanicCrisis(cmn.Fmt("Error reading commit: %v", err))
|
|
}
|
|
return commit
|
|
}
|
|
|
|
// LoadSeenCommit returns the locally seen Commit for the given height.
|
|
// This is useful when we've seen a commit, but there has not yet been
|
|
// a new block at `height + 1` that includes this commit in its block.LastCommit.
|
|
func (bs *BlockStore) LoadSeenCommit(height int64) *types.Commit {
|
|
var n int
|
|
var err error
|
|
r := bs.GetReader(calcSeenCommitKey(height))
|
|
if r == nil {
|
|
return nil
|
|
}
|
|
commit := wire.ReadBinary(&types.Commit{}, r, 0, &n, &err).(*types.Commit)
|
|
if err != nil {
|
|
cmn.PanicCrisis(cmn.Fmt("Error reading commit: %v", err))
|
|
}
|
|
return commit
|
|
}
|
|
|
|
// SaveBlock persists the given block, blockParts, and seenCommit to the underlying db.
|
|
// blockParts: Must be parts of the block
|
|
// seenCommit: The +2/3 precommits that were seen which committed at height.
|
|
// If all the nodes restart after committing a block,
|
|
// we need this to reload the precommits to catch-up nodes to the
|
|
// most recent height. Otherwise they'd stall at H-1.
|
|
func (bs *BlockStore) SaveBlock(block *types.Block, blockParts *types.PartSet, seenCommit *types.Commit) {
|
|
if block == nil {
|
|
cmn.PanicSanity("BlockStore can only save a non-nil block")
|
|
}
|
|
height := block.Height
|
|
if height != bs.Height()+1 {
|
|
cmn.PanicSanity(cmn.Fmt("BlockStore can only save contiguous blocks. Wanted %v, got %v", bs.Height()+1, height))
|
|
}
|
|
if !blockParts.IsComplete() {
|
|
cmn.PanicSanity(cmn.Fmt("BlockStore can only save complete block part sets"))
|
|
}
|
|
|
|
// Save block meta
|
|
blockMeta := types.NewBlockMeta(block, blockParts)
|
|
metaBytes := wire.BinaryBytes(blockMeta)
|
|
bs.db.Set(calcBlockMetaKey(height), metaBytes)
|
|
|
|
// Save block parts
|
|
for i := 0; i < blockParts.Total(); i++ {
|
|
bs.saveBlockPart(height, i, blockParts.GetPart(i))
|
|
}
|
|
|
|
// Save block commit (duplicate and separate from the Block)
|
|
blockCommitBytes := wire.BinaryBytes(block.LastCommit)
|
|
bs.db.Set(calcBlockCommitKey(height-1), blockCommitBytes)
|
|
|
|
// Save seen commit (seen +2/3 precommits for block)
|
|
// NOTE: we can delete this at a later height
|
|
seenCommitBytes := wire.BinaryBytes(seenCommit)
|
|
bs.db.Set(calcSeenCommitKey(height), seenCommitBytes)
|
|
|
|
// Save new BlockStoreStateJSON descriptor
|
|
BlockStoreStateJSON{Height: height}.Save(bs.db)
|
|
|
|
// Done!
|
|
bs.mtx.Lock()
|
|
bs.height = height
|
|
bs.mtx.Unlock()
|
|
|
|
// Flush
|
|
bs.db.SetSync(nil, nil)
|
|
}
|
|
|
|
func (bs *BlockStore) saveBlockPart(height int64, index int, part *types.Part) {
|
|
if height != bs.Height()+1 {
|
|
cmn.PanicSanity(cmn.Fmt("BlockStore can only save contiguous blocks. Wanted %v, got %v", bs.Height()+1, height))
|
|
}
|
|
partBytes := wire.BinaryBytes(part)
|
|
bs.db.Set(calcBlockPartKey(height, index), partBytes)
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
func calcBlockMetaKey(height int64) []byte {
|
|
return []byte(fmt.Sprintf("H:%v", height))
|
|
}
|
|
|
|
func calcBlockPartKey(height int64, partIndex int) []byte {
|
|
return []byte(fmt.Sprintf("P:%v:%v", height, partIndex))
|
|
}
|
|
|
|
func calcBlockCommitKey(height int64) []byte {
|
|
return []byte(fmt.Sprintf("C:%v", height))
|
|
}
|
|
|
|
func calcSeenCommitKey(height int64) []byte {
|
|
return []byte(fmt.Sprintf("SC:%v", height))
|
|
}
|
|
|
|
//-----------------------------------------------------------------------------
|
|
|
|
var blockStoreKey = []byte("blockStore")
|
|
|
|
type BlockStoreStateJSON struct {
|
|
Height int64
|
|
}
|
|
|
|
// Save persists the blockStore state to the database as JSON.
|
|
func (bsj BlockStoreStateJSON) Save(db dbm.DB) {
|
|
bytes, err := json.Marshal(bsj)
|
|
if err != nil {
|
|
cmn.PanicSanity(cmn.Fmt("Could not marshal state bytes: %v", err))
|
|
}
|
|
db.SetSync(blockStoreKey, bytes)
|
|
}
|
|
|
|
// LoadBlockStoreStateJSON returns the BlockStoreStateJSON as loaded from disk.
|
|
// If no BlockStoreStateJSON was previously persisted, it returns a zero value one.
|
|
func LoadBlockStoreStateJSON(db dbm.DB) BlockStoreStateJSON {
|
|
bytes := db.Get(blockStoreKey)
|
|
if bytes == nil {
|
|
return BlockStoreStateJSON{
|
|
Height: 0,
|
|
}
|
|
}
|
|
bsj := BlockStoreStateJSON{}
|
|
err := json.Unmarshal(bytes, &bsj)
|
|
if err != nil {
|
|
cmn.PanicCrisis(cmn.Fmt("Could not unmarshal bytes: %X", bytes))
|
|
}
|
|
return bsj
|
|
}
|