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stubchain.go
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stubchain.go
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package chain
import (
"bytes"
"errors"
"math/big"
"time"
"github.com/aergoio/aergo/message"
"github.com/aergoio/aergo/types"
)
//StubSyncer receive Syncer, P2P, Chain Service actor message
type StubBlockChain struct {
Best int
Hashes []([]byte)
Blocks []*types.Block
BestBlock *types.Block
}
var _ types.ChainAccessor = (*StubBlockChain)(nil)
var (
ErrNotExistHash = errors.New("not exist hash")
ErrNotExistBlock = errors.New("not exist block of the hash")
testBV = types.DummyBlockVersionner(0)
)
func NewStubBlockChain(size int) *StubBlockChain {
if size < 10000 {
size = 10000
}
tchain := &StubBlockChain{Best: -1}
tchain.Hashes = make([][]byte, size+1)
tchain.Blocks = make([]*types.Block, size+1)
return tchain
}
func (tchain *StubBlockChain) GenAddBlock() {
var bi *types.BlockHeaderInfo
var prevBlockRootHash []byte
if tchain.BestBlock != nil {
bi = types.NewBlockHeaderInfoFromPrevBlock(tchain.BestBlock, time.Now().UnixNano(), types.DummyBlockVersionner(0))
prevBlockRootHash = tchain.BestBlock.GetHeader().BlocksRootHash
} else {
cid, _ := types.NewChainID().Bytes()
bi = &types.BlockHeaderInfo{Ts: time.Now().UnixNano(), ChainId: cid}
}
bi.Ts = time.Now().UnixNano()
newBlock := types.NewBlock(bi, prevBlockRootHash, nil, nil, nil, nil)
tchain.AddBlock(newBlock)
time.Sleep(time.Nanosecond * 3)
}
func (tchain *StubBlockChain) AddBlock(newBlock *types.Block) error {
if newBlock.BlockNo() != uint64(tchain.Best+1) {
return ErrBlockOrphan
}
tchain.Best += 1
tchain.Hashes[tchain.Best] = newBlock.BlockHash()
tchain.Blocks[tchain.Best] = newBlock
tchain.BestBlock = newBlock
return nil
}
func (tchain *StubBlockChain) GetHashes(prevInfo *types.BlockInfo, count uint64) ([]message.BlockHash, error) {
if tchain.Best < int(prevInfo.No+count) {
return nil, ErrNotExistHash
}
start := prevInfo.No + 1
resHashes := tchain.Hashes[start : start+count]
blkHashes := make([]message.BlockHash, 0)
for _, hash := range resHashes {
blkHashes = append(blkHashes, hash)
}
return blkHashes, nil
}
func (tchain *StubBlockChain) GetBlockInfo(no uint64) *types.BlockInfo {
return &types.BlockInfo{tchain.Hashes[no], no}
}
func (tchain *StubBlockChain) GetBlockByNo(no uint64) *types.Block {
return tchain.Blocks[no]
}
func (tchain *StubBlockChain) GetBlocks(hashes []message.BlockHash) ([]*types.Block, error) {
startNo := -1
for i, block := range tchain.Blocks {
if bytes.Equal(block.GetHash(), hashes[0]) {
startNo = i
break
}
}
if startNo == -1 {
return nil, ErrNotExistBlock
}
resultBlocks := make([]*types.Block, 0)
i := startNo
for _, hash := range hashes {
if !bytes.Equal(tchain.Blocks[i].GetHash(), hash) {
return nil, ErrNotExistBlock
}
resultBlocks = append(resultBlocks, tchain.Blocks[i])
i++
}
return resultBlocks, nil
}
func (tchain *StubBlockChain) GetGenesisInfo() *types.Genesis {
// Not implemented. It should be implemented later if any test is related
// to genesis info.
return nil
}
func (tchain *StubBlockChain) GetConsensusInfo() string {
return ""
}
func (tchain *StubBlockChain) GetChainStats() string {
return ""
}
func (tchain *StubBlockChain) GetSystemValue(key types.SystemValue) (*big.Int, error) {
return nil, nil
}
func (tchain *StubBlockChain) GetEnterpriseConfig(key string) (*types.EnterpriseConfig, error) {
return nil, nil
}
func (tchain *StubBlockChain) GetBestBlock() (*types.Block, error) {
return tchain.BestBlock, nil
}
func (tchain *StubBlockChain) GetBlock(blockHash []byte) (*types.Block, error) {
for _, block := range tchain.Blocks {
if bytes.Equal(block.GetHash(), blockHash) {
return block, nil
break
}
}
return nil, ErrNotExistBlock
}
func (tchain *StubBlockChain) GetHashByNo(blockNo types.BlockNo) ([]byte, error) {
if uint64(len(tchain.Hashes)) <= blockNo {
return nil, ErrNotExistHash
}
return tchain.Hashes[blockNo], nil
}
//TODO refactoring with getAnchorsNew()
func (tchain *StubBlockChain) GetAnchors() (ChainAnchor, types.BlockNo, error) {
//from top : 8 * 32 = 256
anchors := make(ChainAnchor, 0)
cnt := MaxAnchors
logger.Debug().Msg("get anchors")
bestBlock, _ := tchain.GetBestBlock()
blkNo := bestBlock.BlockNo()
var lastNo types.BlockNo
LOOP:
for i := 0; i < cnt; i++ {
blockHash, err := tchain.GetHashByNo(blkNo)
if err != nil {
logger.Info().Msg("assertion - hash get failed")
// assertion!
return nil, 0, err
}
anchors = append(anchors, blockHash)
lastNo = blkNo
logger.Debug().Uint64("no", blkNo).Msg("anchor added")
switch {
case blkNo == 0:
break LOOP
case blkNo < Skip:
blkNo = 0
default:
blkNo -= Skip
}
}
return anchors, lastNo, nil
}
func (tchain *StubBlockChain) GetAncestorWithHashes(hashes [][]byte) *types.BlockInfo {
for _, hash := range hashes {
for j, chainHash := range tchain.Hashes {
if bytes.Equal(hash, chainHash) {
return &types.BlockInfo{Hash: chainHash, No: uint64(j)}
}
}
}
return nil
}
func (tchain *StubBlockChain) ChainID(bno types.BlockNo) *types.ChainID {
return nil
}
func (tchain *StubBlockChain) Rollback(ancestor *types.BlockInfo) {
prevBest := tchain.Best
tchain.Best = int(ancestor.No)
tchain.BestBlock = tchain.Blocks[tchain.Best]
logger.Debug().Int("prev", prevBest).Int("Best", tchain.Best).Msg("test local chain is rollbacked")
}
func InitStubBlockChain(prefixChain []*types.Block, genCount int) *StubBlockChain {
newChain := NewStubBlockChain(genCount + len(prefixChain) + 1)
//load initial Blocks
for _, block := range prefixChain {
newChain.AddBlock(block)
}
for i := 0; i < genCount; i++ {
newChain.GenAddBlock()
}
return newChain
}