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243 lines
6.6 KiB
243 lines
6.6 KiB
package blockchain
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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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"io"
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"github.com/tendermint/tendermint/binary"
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. "github.com/tendermint/tendermint/common"
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dbm "github.com/tendermint/tendermint/db"
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"github.com/tendermint/tendermint/types"
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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 precommit votes
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Currently the precommit 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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Panics indicate probable corruption in the data
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*/
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type BlockStore struct {
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height int
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db dbm.DB
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}
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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() int {
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return bs.height
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}
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func (bs *BlockStore) GetReader(key []byte) io.Reader {
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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 int) *types.Block {
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var n int64
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var err error
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r := bs.GetReader(calcBlockMetaKey(height))
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if r == nil {
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return nil
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}
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meta := binary.ReadBinary(&types.BlockMeta{}, r, &n, &err).(*types.BlockMeta)
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if err != nil {
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// SOMETHING HAS GONE HORRIBLY WRONG
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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 := 0; i < meta.PartsHeader.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 := binary.ReadBinary(&types.Block{}, bytes.NewReader(bytez), &n, &err).(*types.Block)
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if err != nil {
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// SOMETHING HAS GONE HORRIBLY WRONG
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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 int, index int) *types.Part {
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var n int64
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var err error
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r := bs.GetReader(calcBlockPartKey(height, index))
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if r == nil {
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return nil
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}
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part := binary.ReadBinary(&types.Part{}, r, &n, &err).(*types.Part)
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if err != nil {
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// SOMETHING HAS GONE HORRIBLY WRONG
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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 int) *types.BlockMeta {
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var n int64
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var err error
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r := bs.GetReader(calcBlockMetaKey(height))
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if r == nil {
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return nil
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}
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meta := binary.ReadBinary(&types.BlockMeta{}, r, &n, &err).(*types.BlockMeta)
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if err != nil {
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// SOMETHING HAS GONE HORRIBLY WRONG
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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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// The +2/3 and other Precommit-votes for block at `height`.
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// This Validation comes from block.LastValidation for `height+1`.
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func (bs *BlockStore) LoadBlockValidation(height int) *types.Validation {
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var n int64
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var err error
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r := bs.GetReader(calcBlockValidationKey(height))
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if r == nil {
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return nil
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}
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validation := binary.ReadBinary(&types.Validation{}, r, &n, &err).(*types.Validation)
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if err != nil {
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// SOMETHING HAS GONE HORRIBLY WRONG
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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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// NOTE: the Precommit-vote heights are for the block at `height`
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func (bs *BlockStore) LoadSeenValidation(height int) *types.Validation {
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var n int64
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var err error
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r := bs.GetReader(calcSeenValidationKey(height))
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if r == nil {
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return nil
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}
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validation := binary.ReadBinary(&types.Validation{}, r, &n, &err).(*types.Validation)
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if err != nil {
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// SOMETHING HAS GONE HORRIBLY WRONG
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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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// blockParts: Must be parts of the block
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// seenValidation: 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, seenValidation *types.Validation) {
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height := block.Height
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if height != bs.height+1 {
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// SANITY CHECK
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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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// SANITY CHECK
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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 := types.NewBlockMeta(block, blockParts)
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metaBytes := binary.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 := 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 from the Block)
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blockValidationBytes := binary.BinaryBytes(block.LastValidation)
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bs.db.Set(calcBlockValidationKey(height-1), blockValidationBytes)
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// Save seen validation (seen +2/3 precommits for block)
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seenValidationBytes := binary.BinaryBytes(seenValidation)
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bs.db.Set(calcSeenValidationKey(height), seenValidationBytes)
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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 int, index int, part *types.Part) {
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// SANITY CHECK
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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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// SANITY CHECK END
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partBytes := binary.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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func calcBlockMetaKey(height int) []byte {
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return []byte(fmt.Sprintf("H:%v", height))
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}
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func calcBlockPartKey(height int, 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 calcBlockValidationKey(height int) []byte {
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return []byte(fmt.Sprintf("V:%v", height))
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}
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func calcSeenValidationKey(height int) []byte {
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return []byte(fmt.Sprintf("SV:%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 int
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}
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func (bsj BlockStoreStateJSON) Save(db dbm.DB) {
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bytes, err := json.Marshal(bsj)
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if err != nil {
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// SANITY CHECK
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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 dbm.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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// SOMETHING HAS GONE HORRIBLY WRONG
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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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