mirror of https://github.com/status-im/op-geth.git
Merge pull request #2081 from zsfelfoldi/light-chain
core: create a header chain structure shared by full and light clients
This commit is contained in:
Jeffrey Wilcke
commit
8b58cd0190
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@ -18,11 +18,9 @@
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package core
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import (
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crand "crypto/rand"
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"errors"
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"fmt"
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"io"
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"math"
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"math/big"
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mrand "math/rand"
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"runtime"
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@ -82,24 +80,22 @@ const (
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// included in the canonical one where as GetBlockByNumber always represents the
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// canonical chain.
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type BlockChain struct {
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hc *HeaderChain
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chainDb ethdb.Database
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eventMux *event.TypeMux
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genesisBlock *types.Block
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// Last known total difficulty
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mu sync.RWMutex
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chainmu sync.RWMutex
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tsmu sync.RWMutex
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procmu sync.RWMutex
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checkpoint int // checkpoint counts towards the new checkpoint
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currentHeader *types.Header // Current head of the header chain (may be above the block chain!)
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currentBlock *types.Block // Current head of the block chain
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currentFastBlock *types.Block // Current head of the fast-sync chain (may be above the block chain!)
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checkpoint int // checkpoint counts towards the new checkpoint
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currentBlock *types.Block // Current head of the block chain
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currentFastBlock *types.Block // Current head of the fast-sync chain (may be above the block chain!)
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headerCache *lru.Cache // Cache for the most recent block headers
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bodyCache *lru.Cache // Cache for the most recent block bodies
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bodyRLPCache *lru.Cache // Cache for the most recent block bodies in RLP encoded format
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tdCache *lru.Cache // Cache for the most recent block total difficulties
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blockCache *lru.Cache // Cache for the most recent entire blocks
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futureBlocks *lru.Cache // future blocks are blocks added for later processing
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@ -110,7 +106,6 @@ type BlockChain struct {
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wg sync.WaitGroup
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pow pow.PoW
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rand *mrand.Rand
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processor Processor
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validator Validator
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}
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@ -119,10 +114,8 @@ type BlockChain struct {
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// available in the database. It initialiser the default Ethereum Validator and
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// Processor.
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func NewBlockChain(chainDb ethdb.Database, pow pow.PoW, mux *event.TypeMux) (*BlockChain, error) {
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headerCache, _ := lru.New(headerCacheLimit)
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bodyCache, _ := lru.New(bodyCacheLimit)
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bodyRLPCache, _ := lru.New(bodyCacheLimit)
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tdCache, _ := lru.New(tdCacheLimit)
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blockCache, _ := lru.New(blockCacheLimit)
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futureBlocks, _ := lru.New(maxFutureBlocks)
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@ -130,22 +123,21 @@ func NewBlockChain(chainDb ethdb.Database, pow pow.PoW, mux *event.TypeMux) (*Bl
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chainDb: chainDb,
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eventMux: mux,
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quit: make(chan struct{}),
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headerCache: headerCache,
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bodyCache: bodyCache,
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bodyRLPCache: bodyRLPCache,
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tdCache: tdCache,
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blockCache: blockCache,
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futureBlocks: futureBlocks,
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pow: pow,
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}
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// Seed a fast but crypto originating random generator
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seed, err := crand.Int(crand.Reader, big.NewInt(math.MaxInt64))
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bc.SetValidator(NewBlockValidator(bc, pow))
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bc.SetProcessor(NewStateProcessor(bc))
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gv := func() HeaderValidator { return bc.Validator() }
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var err error
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bc.hc, err = NewHeaderChain(chainDb, gv, bc.getProcInterrupt)
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if err != nil {
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return nil, err
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}
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bc.rand = mrand.New(mrand.NewSource(seed.Int64()))
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bc.SetValidator(NewBlockValidator(bc, pow))
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bc.SetProcessor(NewStateProcessor(bc))
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bc.genesisBlock = bc.GetBlockByNumber(0)
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if bc.genesisBlock == nil {
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@ -171,6 +163,10 @@ func NewBlockChain(chainDb ethdb.Database, pow pow.PoW, mux *event.TypeMux) (*Bl
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return bc, nil
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}
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func (self *BlockChain) getProcInterrupt() bool {
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return atomic.LoadInt32(&self.procInterrupt) == 1
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}
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// loadLastState loads the last known chain state from the database. This method
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// assumes that the chain manager mutex is held.
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func (self *BlockChain) loadLastState() error {
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@ -189,12 +185,13 @@ func (self *BlockChain) loadLastState() error {
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}
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}
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// Restore the last known head header
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self.currentHeader = self.currentBlock.Header()
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currentHeader := self.currentBlock.Header()
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if head := GetHeadHeaderHash(self.chainDb); head != (common.Hash{}) {
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if header := self.GetHeader(head); header != nil {
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self.currentHeader = header
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currentHeader = header
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}
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}
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self.hc.SetCurrentHeader(currentHeader)
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// Restore the last known head fast block
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self.currentFastBlock = self.currentBlock
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if head := GetHeadFastBlockHash(self.chainDb); head != (common.Hash{}) {
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@ -203,11 +200,11 @@ func (self *BlockChain) loadLastState() error {
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}
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}
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// Issue a status log and return
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headerTd := self.GetTd(self.currentHeader.Hash())
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headerTd := self.GetTd(self.hc.CurrentHeader().Hash())
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blockTd := self.GetTd(self.currentBlock.Hash())
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fastTd := self.GetTd(self.currentFastBlock.Hash())
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glog.V(logger.Info).Infof("Last header: #%d [%x…] TD=%v", self.currentHeader.Number, self.currentHeader.Hash().Bytes()[:4], headerTd)
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glog.V(logger.Info).Infof("Last header: #%d [%x…] TD=%v", self.hc.CurrentHeader().Number, self.hc.CurrentHeader().Hash().Bytes()[:4], headerTd)
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glog.V(logger.Info).Infof("Last block: #%d [%x…] TD=%v", self.currentBlock.Number(), self.currentBlock.Hash().Bytes()[:4], blockTd)
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glog.V(logger.Info).Infof("Fast block: #%d [%x…] TD=%v", self.currentFastBlock.Number(), self.currentFastBlock.Hash().Bytes()[:4], fastTd)
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@ -222,71 +219,35 @@ func (bc *BlockChain) SetHead(head uint64) {
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bc.mu.Lock()
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defer bc.mu.Unlock()
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// Figure out the highest known canonical headers and/or blocks
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height := uint64(0)
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if bc.currentHeader != nil {
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if hh := bc.currentHeader.Number.Uint64(); hh > height {
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height = hh
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}
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}
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if bc.currentBlock != nil {
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if bh := bc.currentBlock.NumberU64(); bh > height {
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height = bh
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}
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}
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if bc.currentFastBlock != nil {
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if fbh := bc.currentFastBlock.NumberU64(); fbh > height {
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height = fbh
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}
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}
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// Gather all the hashes that need deletion
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drop := make(map[common.Hash]struct{})
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for bc.currentHeader != nil && bc.currentHeader.Number.Uint64() > head {
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drop[bc.currentHeader.Hash()] = struct{}{}
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bc.currentHeader = bc.GetHeader(bc.currentHeader.ParentHash)
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}
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for bc.currentBlock != nil && bc.currentBlock.NumberU64() > head {
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drop[bc.currentBlock.Hash()] = struct{}{}
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bc.currentBlock = bc.GetBlock(bc.currentBlock.ParentHash())
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}
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for bc.currentFastBlock != nil && bc.currentFastBlock.NumberU64() > head {
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drop[bc.currentFastBlock.Hash()] = struct{}{}
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bc.currentFastBlock = bc.GetBlock(bc.currentFastBlock.ParentHash())
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}
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// Roll back the canonical chain numbering
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for i := height; i > head; i-- {
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DeleteCanonicalHash(bc.chainDb, i)
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}
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// Delete everything found by the above rewind
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for hash, _ := range drop {
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DeleteHeader(bc.chainDb, hash)
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delFn := func(hash common.Hash) {
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DeleteBody(bc.chainDb, hash)
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DeleteTd(bc.chainDb, hash)
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}
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bc.hc.SetHead(head, delFn)
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// Clear out any stale content from the caches
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bc.headerCache.Purge()
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bc.bodyCache.Purge()
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bc.bodyRLPCache.Purge()
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bc.blockCache.Purge()
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bc.futureBlocks.Purge()
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// Update all computed fields to the new head
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if bc.currentBlock != nil && bc.hc.CurrentHeader().Number.Uint64() < bc.currentBlock.NumberU64() {
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bc.currentBlock = bc.GetBlock(bc.hc.CurrentHeader().Hash())
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}
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if bc.currentFastBlock != nil && bc.hc.CurrentHeader().Number.Uint64() < bc.currentFastBlock.NumberU64() {
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bc.currentFastBlock = bc.GetBlock(bc.hc.CurrentHeader().Hash())
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}
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if bc.currentBlock == nil {
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bc.currentBlock = bc.genesisBlock
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}
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if bc.currentHeader == nil {
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bc.currentHeader = bc.genesisBlock.Header()
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}
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if bc.currentFastBlock == nil {
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bc.currentFastBlock = bc.genesisBlock
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}
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if err := WriteHeadBlockHash(bc.chainDb, bc.currentBlock.Hash()); err != nil {
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glog.Fatalf("failed to reset head block hash: %v", err)
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}
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if err := WriteHeadHeaderHash(bc.chainDb, bc.currentHeader.Hash()); err != nil {
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glog.Fatalf("failed to reset head header hash: %v", err)
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}
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if err := WriteHeadFastBlockHash(bc.chainDb, bc.currentFastBlock.Hash()); err != nil {
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glog.Fatalf("failed to reset head fast block hash: %v", err)
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}
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@ -329,15 +290,6 @@ func (self *BlockChain) LastBlockHash() common.Hash {
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return self.currentBlock.Hash()
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}
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// CurrentHeader retrieves the current head header of the canonical chain. The
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// header is retrieved from the blockchain's internal cache.
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func (self *BlockChain) CurrentHeader() *types.Header {
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self.mu.RLock()
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defer self.mu.RUnlock()
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return self.currentHeader
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}
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// CurrentBlock retrieves the current head block of the canonical chain. The
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// block is retrieved from the blockchain's internal cache.
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func (self *BlockChain) CurrentBlock() *types.Block {
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@ -425,7 +377,8 @@ func (bc *BlockChain) ResetWithGenesisBlock(genesis *types.Block) {
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bc.genesisBlock = genesis
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bc.insert(bc.genesisBlock)
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bc.currentBlock = bc.genesisBlock
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bc.currentHeader = bc.genesisBlock.Header()
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bc.hc.SetGenesis(bc.genesisBlock.Header())
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bc.hc.SetCurrentHeader(bc.genesisBlock.Header())
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bc.currentFastBlock = bc.genesisBlock
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}
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@ -483,10 +436,7 @@ func (bc *BlockChain) insert(block *types.Block) {
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// If the block is better than out head or is on a different chain, force update heads
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if updateHeads {
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if err := WriteHeadHeaderHash(bc.chainDb, block.Hash()); err != nil {
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glog.Fatalf("failed to insert head header hash: %v", err)
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}
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bc.currentHeader = block.Header()
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bc.hc.SetCurrentHeader(block.Header())
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if err := WriteHeadFastBlockHash(bc.chainDb, block.Hash()); err != nil {
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glog.Fatalf("failed to insert head fast block hash: %v", err)
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@ -500,38 +450,6 @@ func (bc *BlockChain) Genesis() *types.Block {
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return bc.genesisBlock
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}
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// HasHeader checks if a block header is present in the database or not, caching
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// it if present.
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func (bc *BlockChain) HasHeader(hash common.Hash) bool {
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return bc.GetHeader(hash) != nil
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}
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// GetHeader retrieves a block header from the database by hash, caching it if
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// found.
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func (self *BlockChain) GetHeader(hash common.Hash) *types.Header {
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// Short circuit if the header's already in the cache, retrieve otherwise
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if header, ok := self.headerCache.Get(hash); ok {
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return header.(*types.Header)
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}
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header := GetHeader(self.chainDb, hash)
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if header == nil {
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return nil
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}
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// Cache the found header for next time and return
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self.headerCache.Add(header.Hash(), header)
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return header
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}
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// GetHeaderByNumber retrieves a block header from the database by number,
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// caching it (associated with its hash) if found.
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func (self *BlockChain) GetHeaderByNumber(number uint64) *types.Header {
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hash := GetCanonicalHash(self.chainDb, number)
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if hash == (common.Hash{}) {
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return nil
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}
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return self.GetHeader(hash)
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}
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// GetBody retrieves a block body (transactions and uncles) from the database by
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// hash, caching it if found.
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func (self *BlockChain) GetBody(hash common.Hash) *types.Body {
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@ -565,22 +483,6 @@ func (self *BlockChain) GetBodyRLP(hash common.Hash) rlp.RawValue {
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return body
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}
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// GetTd retrieves a block's total difficulty in the canonical chain from the
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// database by hash, caching it if found.
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func (self *BlockChain) GetTd(hash common.Hash) *big.Int {
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// Short circuit if the td's already in the cache, retrieve otherwise
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if cached, ok := self.tdCache.Get(hash); ok {
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return cached.(*big.Int)
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}
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td := GetTd(self.chainDb, hash)
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if td == nil {
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return nil
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}
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// Cache the found body for next time and return
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self.tdCache.Add(hash, td)
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return td
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}
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// HasBlock checks if a block is fully present in the database or not, caching
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// it if present.
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func (bc *BlockChain) HasBlock(hash common.Hash) bool {
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@ -625,28 +527,6 @@ func (self *BlockChain) GetBlockByNumber(number uint64) *types.Block {
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return self.GetBlock(hash)
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}
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// GetBlockHashesFromHash retrieves a number of block hashes starting at a given
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// hash, fetching towards the genesis block.
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func (self *BlockChain) GetBlockHashesFromHash(hash common.Hash, max uint64) []common.Hash {
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// Get the origin header from which to fetch
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header := self.GetHeader(hash)
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if header == nil {
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return nil
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}
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// Iterate the headers until enough is collected or the genesis reached
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chain := make([]common.Hash, 0, max)
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for i := uint64(0); i < max; i++ {
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if header = self.GetHeader(header.ParentHash); header == nil {
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break
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}
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chain = append(chain, header.Hash())
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if header.Number.Cmp(common.Big0) == 0 {
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break
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}
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}
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return chain
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}
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// [deprecated by eth/62]
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// GetBlocksFromHash returns the block corresponding to hash and up to n-1 ancestors.
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func (self *BlockChain) GetBlocksFromHash(hash common.Hash, n int) (blocks []*types.Block) {
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@ -698,195 +578,15 @@ func (self *BlockChain) procFutureBlocks() {
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}
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}
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type writeStatus byte
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type WriteStatus byte
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const (
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NonStatTy writeStatus = iota
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NonStatTy WriteStatus = iota
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CanonStatTy
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SplitStatTy
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SideStatTy
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)
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// writeHeader writes a header into the local chain, given that its parent is
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// already known. If the total difficulty of the newly inserted header becomes
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// greater than the current known TD, the canonical chain is re-routed.
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//
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// Note: This method is not concurrent-safe with inserting blocks simultaneously
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// into the chain, as side effects caused by reorganisations cannot be emulated
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// without the real blocks. Hence, writing headers directly should only be done
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// in two scenarios: pure-header mode of operation (light clients), or properly
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// separated header/block phases (non-archive clients).
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func (self *BlockChain) writeHeader(header *types.Header) error {
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self.wg.Add(1)
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defer self.wg.Done()
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// Calculate the total difficulty of the header
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ptd := self.GetTd(header.ParentHash)
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if ptd == nil {
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return ParentError(header.ParentHash)
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}
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localTd := self.GetTd(self.currentHeader.Hash())
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externTd := new(big.Int).Add(header.Difficulty, ptd)
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// Make sure no inconsistent state is leaked during insertion
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self.mu.Lock()
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defer self.mu.Unlock()
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// If the total difficulty is higher than our known, add it to the canonical chain
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// Second clause in the if statement reduces the vulnerability to selfish mining.
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// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf
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if externTd.Cmp(localTd) > 0 || (externTd.Cmp(localTd) == 0 && mrand.Float64() < 0.5) {
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// Delete any canonical number assignments above the new head
|
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for i := header.Number.Uint64() + 1; GetCanonicalHash(self.chainDb, i) != (common.Hash{}); i++ {
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DeleteCanonicalHash(self.chainDb, i)
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}
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// Overwrite any stale canonical number assignments
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head := self.GetHeader(header.ParentHash)
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for GetCanonicalHash(self.chainDb, head.Number.Uint64()) != head.Hash() {
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WriteCanonicalHash(self.chainDb, head.Hash(), head.Number.Uint64())
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head = self.GetHeader(head.ParentHash)
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}
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// Extend the canonical chain with the new header
|
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if err := WriteCanonicalHash(self.chainDb, header.Hash(), header.Number.Uint64()); err != nil {
|
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glog.Fatalf("failed to insert header number: %v", err)
|
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}
|
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if err := WriteHeadHeaderHash(self.chainDb, header.Hash()); err != nil {
|
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glog.Fatalf("failed to insert head header hash: %v", err)
|
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}
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self.currentHeader = types.CopyHeader(header)
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}
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// Irrelevant of the canonical status, write the header itself to the database
|
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if err := WriteTd(self.chainDb, header.Hash(), externTd); err != nil {
|
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glog.Fatalf("failed to write header total difficulty: %v", err)
|
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}
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if err := WriteHeader(self.chainDb, header); err != nil {
|
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glog.Fatalf("filed to write header contents: %v", err)
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}
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return nil
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}
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|
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// InsertHeaderChain attempts to insert the given header chain in to the local
|
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// chain, possibly creating a reorg. If an error is returned, it will return the
|
||||
// index number of the failing header as well an error describing what went wrong.
|
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//
|
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// The verify parameter can be used to fine tune whether nonce verification
|
||||
// should be done or not. The reason behind the optional check is because some
|
||||
// of the header retrieval mechanisms already need to verfy nonces, as well as
|
||||
// because nonces can be verified sparsely, not needing to check each.
|
||||
func (self *BlockChain) InsertHeaderChain(chain []*types.Header, checkFreq int) (int, error) {
|
||||
self.wg.Add(1)
|
||||
defer self.wg.Done()
|
||||
|
||||
// Make sure only one thread manipulates the chain at once
|
||||
self.chainmu.Lock()
|
||||
defer self.chainmu.Unlock()
|
||||
|
||||
// Collect some import statistics to report on
|
||||
stats := struct{ processed, ignored int }{}
|
||||
start := time.Now()
|
||||
|
||||
// Generate the list of headers that should be POW verified
|
||||
verify := make([]bool, len(chain))
|
||||
for i := 0; i < len(verify)/checkFreq; i++ {
|
||||
index := i*checkFreq + self.rand.Intn(checkFreq)
|
||||
if index >= len(verify) {
|
||||
index = len(verify) - 1
|
||||
}
|
||||
verify[index] = true
|
||||
}
|
||||
verify[len(verify)-1] = true // Last should always be verified to avoid junk
|
||||
|
||||
// Create the header verification task queue and worker functions
|
||||
tasks := make(chan int, len(chain))
|
||||
for i := 0; i < len(chain); i++ {
|
||||
tasks <- i
|
||||
}
|
||||
close(tasks)
|
||||
|
||||
errs, failed := make([]error, len(tasks)), int32(0)
|
||||
process := func(worker int) {
|
||||
for index := range tasks {
|
||||
header, hash := chain[index], chain[index].Hash()
|
||||
|
||||
// Short circuit insertion if shutting down or processing failed
|
||||
if atomic.LoadInt32(&self.procInterrupt) == 1 {
|
||||
return
|
||||
}
|
||||
if atomic.LoadInt32(&failed) > 0 {
|
||||
return
|
||||
}
|
||||
// Short circuit if the header is bad or already known
|
||||
if BadHashes[hash] {
|
||||
errs[index] = BadHashError(hash)
|
||||
atomic.AddInt32(&failed, 1)
|
||||
return
|
||||
}
|
||||
if self.HasHeader(hash) {
|
||||
continue
|
||||
}
|
||||
// Verify that the header honors the chain parameters
|
||||
checkPow := verify[index]
|
||||
|
||||
var err error
|
||||
if index == 0 {
|
||||
err = self.Validator().ValidateHeader(header, self.GetHeader(header.ParentHash), checkPow)
|
||||
} else {
|
||||
err = self.Validator().ValidateHeader(header, chain[index-1], checkPow)
|
||||
}
|
||||
if err != nil {
|
||||
errs[index] = err
|
||||
atomic.AddInt32(&failed, 1)
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
// Start as many worker threads as goroutines allowed
|
||||
pending := new(sync.WaitGroup)
|
||||
for i := 0; i < runtime.GOMAXPROCS(0); i++ {
|
||||
pending.Add(1)
|
||||
go func(id int) {
|
||||
defer pending.Done()
|
||||
process(id)
|
||||
}(i)
|
||||
}
|
||||
pending.Wait()
|
||||
|
||||
// If anything failed, report
|
||||
if failed > 0 {
|
||||
for i, err := range errs {
|
||||
if err != nil {
|
||||
return i, err
|
||||
}
|
||||
}
|
||||
}
|
||||
// All headers passed verification, import them into the database
|
||||
for i, header := range chain {
|
||||
// Short circuit insertion if shutting down
|
||||
if atomic.LoadInt32(&self.procInterrupt) == 1 {
|
||||
glog.V(logger.Debug).Infoln("premature abort during header chain processing")
|
||||
break
|
||||
}
|
||||
hash := header.Hash()
|
||||
|
||||
// If the header's already known, skip it, otherwise store
|
||||
if self.HasHeader(hash) {
|
||||
stats.ignored++
|
||||
continue
|
||||
}
|
||||
if err := self.writeHeader(header); err != nil {
|
||||
return i, err
|
||||
}
|
||||
stats.processed++
|
||||
}
|
||||
// Report some public statistics so the user has a clue what's going on
|
||||
first, last := chain[0], chain[len(chain)-1]
|
||||
glog.V(logger.Info).Infof("imported %d header(s) (%d ignored) in %v. #%v [%x… / %x…]", stats.processed, stats.ignored,
|
||||
time.Since(start), last.Number, first.Hash().Bytes()[:4], last.Hash().Bytes()[:4])
|
||||
|
||||
return 0, nil
|
||||
}
|
||||
|
||||
// Rollback is designed to remove a chain of links from the database that aren't
|
||||
// certain enough to be valid.
|
||||
func (self *BlockChain) Rollback(chain []common.Hash) {
|
||||
|
|
@ -896,9 +596,8 @@ func (self *BlockChain) Rollback(chain []common.Hash) {
|
|||
for i := len(chain) - 1; i >= 0; i-- {
|
||||
hash := chain[i]
|
||||
|
||||
if self.currentHeader.Hash() == hash {
|
||||
self.currentHeader = self.GetHeader(self.currentHeader.ParentHash)
|
||||
WriteHeadHeaderHash(self.chainDb, self.currentHeader.Hash())
|
||||
if self.hc.CurrentHeader().Hash() == hash {
|
||||
self.hc.SetCurrentHeader(self.GetHeader(self.hc.CurrentHeader().ParentHash))
|
||||
}
|
||||
if self.currentFastBlock.Hash() == hash {
|
||||
self.currentFastBlock = self.GetBlock(self.currentFastBlock.ParentHash())
|
||||
|
|
@ -1055,7 +754,7 @@ func (self *BlockChain) InsertReceiptChain(blockChain types.Blocks, receiptChain
|
|||
}
|
||||
|
||||
// WriteBlock writes the block to the chain.
|
||||
func (self *BlockChain) WriteBlock(block *types.Block) (status writeStatus, err error) {
|
||||
func (self *BlockChain) WriteBlock(block *types.Block) (status WriteStatus, err error) {
|
||||
self.wg.Add(1)
|
||||
defer self.wg.Done()
|
||||
|
||||
|
|
@ -1427,3 +1126,89 @@ func reportBlock(block *types.Block, err error) {
|
|||
}
|
||||
go ReportBlock(block, err)
|
||||
}
|
||||
|
||||
// InsertHeaderChain attempts to insert the given header chain in to the local
|
||||
// chain, possibly creating a reorg. If an error is returned, it will return the
|
||||
// index number of the failing header as well an error describing what went wrong.
|
||||
//
|
||||
// The verify parameter can be used to fine tune whether nonce verification
|
||||
// should be done or not. The reason behind the optional check is because some
|
||||
// of the header retrieval mechanisms already need to verfy nonces, as well as
|
||||
// because nonces can be verified sparsely, not needing to check each.
|
||||
func (self *BlockChain) InsertHeaderChain(chain []*types.Header, checkFreq int) (int, error) {
|
||||
// Make sure only one thread manipulates the chain at once
|
||||
self.chainmu.Lock()
|
||||
defer self.chainmu.Unlock()
|
||||
|
||||
self.wg.Add(1)
|
||||
defer self.wg.Done()
|
||||
|
||||
whFunc := func(header *types.Header) error {
|
||||
self.mu.Lock()
|
||||
defer self.mu.Unlock()
|
||||
|
||||
_, err := self.hc.WriteHeader(header)
|
||||
return err
|
||||
}
|
||||
|
||||
return self.hc.InsertHeaderChain(chain, checkFreq, whFunc)
|
||||
}
|
||||
|
||||
// writeHeader writes a header into the local chain, given that its parent is
|
||||
// already known. If the total difficulty of the newly inserted header becomes
|
||||
// greater than the current known TD, the canonical chain is re-routed.
|
||||
//
|
||||
// Note: This method is not concurrent-safe with inserting blocks simultaneously
|
||||
// into the chain, as side effects caused by reorganisations cannot be emulated
|
||||
// without the real blocks. Hence, writing headers directly should only be done
|
||||
// in two scenarios: pure-header mode of operation (light clients), or properly
|
||||
// separated header/block phases (non-archive clients).
|
||||
func (self *BlockChain) writeHeader(header *types.Header) error {
|
||||
self.wg.Add(1)
|
||||
defer self.wg.Done()
|
||||
|
||||
self.mu.Lock()
|
||||
defer self.mu.Unlock()
|
||||
|
||||
_, err := self.hc.WriteHeader(header)
|
||||
return err
|
||||
}
|
||||
|
||||
// CurrentHeader retrieves the current head header of the canonical chain. The
|
||||
// header is retrieved from the HeaderChain's internal cache.
|
||||
func (self *BlockChain) CurrentHeader() *types.Header {
|
||||
self.mu.RLock()
|
||||
defer self.mu.RUnlock()
|
||||
|
||||
return self.hc.CurrentHeader()
|
||||
}
|
||||
|
||||
// GetTd retrieves a block's total difficulty in the canonical chain from the
|
||||
// database by hash, caching it if found.
|
||||
func (self *BlockChain) GetTd(hash common.Hash) *big.Int {
|
||||
return self.hc.GetTd(hash)
|
||||
}
|
||||
|
||||
// GetHeader retrieves a block header from the database by hash, caching it if
|
||||
// found.
|
||||
func (self *BlockChain) GetHeader(hash common.Hash) *types.Header {
|
||||
return self.hc.GetHeader(hash)
|
||||
}
|
||||
|
||||
// HasHeader checks if a block header is present in the database or not, caching
|
||||
// it if present.
|
||||
func (bc *BlockChain) HasHeader(hash common.Hash) bool {
|
||||
return bc.hc.HasHeader(hash)
|
||||
}
|
||||
|
||||
// GetBlockHashesFromHash retrieves a number of block hashes starting at a given
|
||||
// hash, fetching towards the genesis block.
|
||||
func (self *BlockChain) GetBlockHashesFromHash(hash common.Hash, max uint64) []common.Hash {
|
||||
return self.hc.GetBlockHashesFromHash(hash, max)
|
||||
}
|
||||
|
||||
// GetHeaderByNumber retrieves a block header from the database by number,
|
||||
// caching it (associated with its hash) if found.
|
||||
func (self *BlockChain) GetHeaderByNumber(number uint64) *types.Header {
|
||||
return self.hc.GetHeaderByNumber(number)
|
||||
}
|
||||
|
|
|
|||
|
|
@ -472,11 +472,16 @@ func makeBlockChainWithDiff(genesis *types.Block, d []int, seed byte) []*types.B
|
|||
|
||||
func chm(genesis *types.Block, db ethdb.Database) *BlockChain {
|
||||
var eventMux event.TypeMux
|
||||
bc := &BlockChain{chainDb: db, genesisBlock: genesis, eventMux: &eventMux, pow: FakePow{}, rand: rand.New(rand.NewSource(0))}
|
||||
bc.headerCache, _ = lru.New(100)
|
||||
bc := &BlockChain{
|
||||
chainDb: db,
|
||||
genesisBlock: genesis,
|
||||
eventMux: &eventMux,
|
||||
pow: FakePow{},
|
||||
}
|
||||
valFn := func() HeaderValidator { return bc.Validator() }
|
||||
bc.hc, _ = NewHeaderChain(db, valFn, bc.getProcInterrupt)
|
||||
bc.bodyCache, _ = lru.New(100)
|
||||
bc.bodyRLPCache, _ = lru.New(100)
|
||||
bc.tdCache, _ = lru.New(100)
|
||||
bc.blockCache, _ = lru.New(100)
|
||||
bc.futureBlocks, _ = lru.New(100)
|
||||
bc.SetValidator(bproc{})
|
||||
|
|
|
|||
|
|
@ -0,0 +1,432 @@
|
|||
// Copyright 2015 The go-ethereum Authors
|
||||
// This file is part of the go-ethereum library.
|
||||
//
|
||||
// The go-ethereum library is free software: you can redistribute it and/or modify
|
||||
// it under the terms of the GNU Lesser General Public License as published by
|
||||
// the Free Software Foundation, either version 3 of the License, or
|
||||
// (at your option) any later version.
|
||||
//
|
||||
// The go-ethereum library is distributed in the hope that it will be useful,
|
||||
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
// GNU Lesser General Public License for more details.
|
||||
//
|
||||
// You should have received a copy of the GNU Lesser General Public License
|
||||
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
||||
package core
|
||||
|
||||
import (
|
||||
crand "crypto/rand"
|
||||
"math"
|
||||
"math/big"
|
||||
mrand "math/rand"
|
||||
"runtime"
|
||||
"sync"
|
||||
"sync/atomic"
|
||||
"time"
|
||||
|
||||
"github.com/ethereum/go-ethereum/common"
|
||||
"github.com/ethereum/go-ethereum/core/types"
|
||||
"github.com/ethereum/go-ethereum/ethdb"
|
||||
"github.com/ethereum/go-ethereum/logger"
|
||||
"github.com/ethereum/go-ethereum/logger/glog"
|
||||
"github.com/ethereum/go-ethereum/pow"
|
||||
"github.com/hashicorp/golang-lru"
|
||||
)
|
||||
|
||||
// HeaderChain implements the basic block header chain logic that is shared by
|
||||
// core.BlockChain and light.LightChain. It is not usable in itself, only as
|
||||
// a part of either structure.
|
||||
// It is not thread safe either, the encapsulating chain structures should do
|
||||
// the necessary mutex locking/unlocking.
|
||||
type HeaderChain struct {
|
||||
chainDb ethdb.Database
|
||||
genesisHeader *types.Header
|
||||
|
||||
currentHeader *types.Header // Current head of the header chain (may be above the block chain!)
|
||||
headerCache *lru.Cache // Cache for the most recent block headers
|
||||
tdCache *lru.Cache // Cache for the most recent block total difficulties
|
||||
|
||||
procInterrupt func() bool
|
||||
|
||||
rand *mrand.Rand
|
||||
getValidator getHeaderValidatorFn
|
||||
}
|
||||
|
||||
// getHeaderValidatorFn returns a HeaderValidator interface
|
||||
type getHeaderValidatorFn func() HeaderValidator
|
||||
|
||||
// NewHeaderChain creates a new HeaderChain structure.
|
||||
// getValidator should return the parent's validator
|
||||
// procInterrupt points to the parent's interrupt semaphore
|
||||
// wg points to the parent's shutdown wait group
|
||||
func NewHeaderChain(chainDb ethdb.Database, getValidator getHeaderValidatorFn, procInterrupt func() bool) (*HeaderChain, error) {
|
||||
headerCache, _ := lru.New(headerCacheLimit)
|
||||
tdCache, _ := lru.New(tdCacheLimit)
|
||||
|
||||
// Seed a fast but crypto originating random generator
|
||||
seed, err := crand.Int(crand.Reader, big.NewInt(math.MaxInt64))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
hc := &HeaderChain{
|
||||
chainDb: chainDb,
|
||||
headerCache: headerCache,
|
||||
tdCache: tdCache,
|
||||
procInterrupt: procInterrupt,
|
||||
rand: mrand.New(mrand.NewSource(seed.Int64())),
|
||||
getValidator: getValidator,
|
||||
}
|
||||
|
||||
hc.genesisHeader = hc.GetHeaderByNumber(0)
|
||||
if hc.genesisHeader == nil {
|
||||
genesisBlock, err := WriteDefaultGenesisBlock(chainDb)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
glog.V(logger.Info).Infoln("WARNING: Wrote default ethereum genesis block")
|
||||
hc.genesisHeader = genesisBlock.Header()
|
||||
}
|
||||
|
||||
hc.currentHeader = hc.genesisHeader
|
||||
if head := GetHeadBlockHash(chainDb); head != (common.Hash{}) {
|
||||
if chead := hc.GetHeader(head); chead != nil {
|
||||
hc.currentHeader = chead
|
||||
}
|
||||
}
|
||||
|
||||
return hc, nil
|
||||
}
|
||||
|
||||
// WriteHeader writes a header into the local chain, given that its parent is
|
||||
// already known. If the total difficulty of the newly inserted header becomes
|
||||
// greater than the current known TD, the canonical chain is re-routed.
|
||||
//
|
||||
// Note: This method is not concurrent-safe with inserting blocks simultaneously
|
||||
// into the chain, as side effects caused by reorganisations cannot be emulated
|
||||
// without the real blocks. Hence, writing headers directly should only be done
|
||||
// in two scenarios: pure-header mode of operation (light clients), or properly
|
||||
// separated header/block phases (non-archive clients).
|
||||
func (hc *HeaderChain) WriteHeader(header *types.Header) (status WriteStatus, err error) {
|
||||
// Calculate the total difficulty of the header
|
||||
ptd := hc.GetTd(header.ParentHash)
|
||||
if ptd == nil {
|
||||
return NonStatTy, ParentError(header.ParentHash)
|
||||
}
|
||||
localTd := hc.GetTd(hc.currentHeader.Hash())
|
||||
externTd := new(big.Int).Add(header.Difficulty, ptd)
|
||||
|
||||
// If the total difficulty is higher than our known, add it to the canonical chain
|
||||
// Second clause in the if statement reduces the vulnerability to selfish mining.
|
||||
// Please refer to http://www.cs.cornell.edu/~ie53/publications/btcProcFC.pdf
|
||||
if externTd.Cmp(localTd) > 0 || (externTd.Cmp(localTd) == 0 && mrand.Float64() < 0.5) {
|
||||
// Delete any canonical number assignments above the new head
|
||||
for i := header.Number.Uint64() + 1; GetCanonicalHash(hc.chainDb, i) != (common.Hash{}); i++ {
|
||||
DeleteCanonicalHash(hc.chainDb, i)
|
||||
}
|
||||
// Overwrite any stale canonical number assignments
|
||||
head := hc.GetHeader(header.ParentHash)
|
||||
for GetCanonicalHash(hc.chainDb, head.Number.Uint64()) != head.Hash() {
|
||||
WriteCanonicalHash(hc.chainDb, head.Hash(), head.Number.Uint64())
|
||||
head = hc.GetHeader(head.ParentHash)
|
||||
}
|
||||
// Extend the canonical chain with the new header
|
||||
if err := WriteCanonicalHash(hc.chainDb, header.Hash(), header.Number.Uint64()); err != nil {
|
||||
glog.Fatalf("failed to insert header number: %v", err)
|
||||
}
|
||||
if err := WriteHeadHeaderHash(hc.chainDb, header.Hash()); err != nil {
|
||||
glog.Fatalf("failed to insert head header hash: %v", err)
|
||||
}
|
||||
hc.currentHeader = types.CopyHeader(header)
|
||||
status = CanonStatTy
|
||||
} else {
|
||||
status = SideStatTy
|
||||
}
|
||||
// Irrelevant of the canonical status, write the header itself to the database
|
||||
if err := WriteTd(hc.chainDb, header.Hash(), externTd); err != nil {
|
||||
glog.Fatalf("failed to write header total difficulty: %v", err)
|
||||
}
|
||||
if err := WriteHeader(hc.chainDb, header); err != nil {
|
||||
glog.Fatalf("failed to write header contents: %v", err)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// WhCallback is a callback function for inserting individual headers.
|
||||
// A callback is used for two reasons: first, in a LightChain, status should be
|
||||
// processed and light chain events sent, while in a BlockChain this is not
|
||||
// necessary since chain events are sent after inserting blocks. Second, the
|
||||
// header writes should be protected by the parent chain mutex individually.
|
||||
type WhCallback func(*types.Header) error
|
||||
|
||||
// InsertHeaderChain attempts to insert the given header chain in to the local
|
||||
// chain, possibly creating a reorg. If an error is returned, it will return the
|
||||
// index number of the failing header as well an error describing what went wrong.
|
||||
//
|
||||
// The verify parameter can be used to fine tune whether nonce verification
|
||||
// should be done or not. The reason behind the optional check is because some
|
||||
// of the header retrieval mechanisms already need to verfy nonces, as well as
|
||||
// because nonces can be verified sparsely, not needing to check each.
|
||||
func (hc *HeaderChain) InsertHeaderChain(chain []*types.Header, checkFreq int, writeHeader WhCallback) (int, error) {
|
||||
// Collect some import statistics to report on
|
||||
stats := struct{ processed, ignored int }{}
|
||||
start := time.Now()
|
||||
|
||||
// Generate the list of headers that should be POW verified
|
||||
verify := make([]bool, len(chain))
|
||||
for i := 0; i < len(verify)/checkFreq; i++ {
|
||||
index := i*checkFreq + hc.rand.Intn(checkFreq)
|
||||
if index >= len(verify) {
|
||||
index = len(verify) - 1
|
||||
}
|
||||
verify[index] = true
|
||||
}
|
||||
verify[len(verify)-1] = true // Last should always be verified to avoid junk
|
||||
|
||||
// Create the header verification task queue and worker functions
|
||||
tasks := make(chan int, len(chain))
|
||||
for i := 0; i < len(chain); i++ {
|
||||
tasks <- i
|
||||
}
|
||||
close(tasks)
|
||||
|
||||
errs, failed := make([]error, len(tasks)), int32(0)
|
||||
process := func(worker int) {
|
||||
for index := range tasks {
|
||||
header, hash := chain[index], chain[index].Hash()
|
||||
|
||||
// Short circuit insertion if shutting down or processing failed
|
||||
if hc.procInterrupt() {
|
||||
return
|
||||
}
|
||||
if atomic.LoadInt32(&failed) > 0 {
|
||||
return
|
||||
}
|
||||
// Short circuit if the header is bad or already known
|
||||
if BadHashes[hash] {
|
||||
errs[index] = BadHashError(hash)
|
||||
atomic.AddInt32(&failed, 1)
|
||||
return
|
||||
}
|
||||
if hc.HasHeader(hash) {
|
||||
continue
|
||||
}
|
||||
// Verify that the header honors the chain parameters
|
||||
checkPow := verify[index]
|
||||
|
||||
var err error
|
||||
if index == 0 {
|
||||
err = hc.getValidator().ValidateHeader(header, hc.GetHeader(header.ParentHash), checkPow)
|
||||
} else {
|
||||
err = hc.getValidator().ValidateHeader(header, chain[index-1], checkPow)
|
||||
}
|
||||
if err != nil {
|
||||
errs[index] = err
|
||||
atomic.AddInt32(&failed, 1)
|
||||
return
|
||||
}
|
||||
}
|
||||
}
|
||||
// Start as many worker threads as goroutines allowed
|
||||
pending := new(sync.WaitGroup)
|
||||
for i := 0; i < runtime.GOMAXPROCS(0); i++ {
|
||||
pending.Add(1)
|
||||
go func(id int) {
|
||||
defer pending.Done()
|
||||
process(id)
|
||||
}(i)
|
||||
}
|
||||
pending.Wait()
|
||||
|
||||
// If anything failed, report
|
||||
if failed > 0 {
|
||||
for i, err := range errs {
|
||||
if err != nil {
|
||||
return i, err
|
||||
}
|
||||
}
|
||||
}
|
||||
// All headers passed verification, import them into the database
|
||||
for i, header := range chain {
|
||||
// Short circuit insertion if shutting down
|
||||
if hc.procInterrupt() {
|
||||
glog.V(logger.Debug).Infoln("premature abort during header chain processing")
|
||||
break
|
||||
}
|
||||
hash := header.Hash()
|
||||
|
||||
// If the header's already known, skip it, otherwise store
|
||||
if hc.HasHeader(hash) {
|
||||
stats.ignored++
|
||||
continue
|
||||
}
|
||||
if err := writeHeader(header); err != nil {
|
||||
return i, err
|
||||
}
|
||||
stats.processed++
|
||||
}
|
||||
// Report some public statistics so the user has a clue what's going on
|
||||
first, last := chain[0], chain[len(chain)-1]
|
||||
glog.V(logger.Info).Infof("imported %d header(s) (%d ignored) in %v. #%v [%x… / %x…]", stats.processed, stats.ignored,
|
||||
time.Since(start), last.Number, first.Hash().Bytes()[:4], last.Hash().Bytes()[:4])
|
||||
|
||||
return 0, nil
|
||||
}
|
||||
|
||||
// GetBlockHashesFromHash retrieves a number of block hashes starting at a given
|
||||
// hash, fetching towards the genesis block.
|
||||
func (hc *HeaderChain) GetBlockHashesFromHash(hash common.Hash, max uint64) []common.Hash {
|
||||
// Get the origin header from which to fetch
|
||||
header := hc.GetHeader(hash)
|
||||
if header == nil {
|
||||
return nil
|
||||
}
|
||||
// Iterate the headers until enough is collected or the genesis reached
|
||||
chain := make([]common.Hash, 0, max)
|
||||
for i := uint64(0); i < max; i++ {
|
||||
if header = hc.GetHeader(header.ParentHash); header == nil {
|
||||
break
|
||||
}
|
||||
chain = append(chain, header.Hash())
|
||||
if header.Number.Cmp(common.Big0) == 0 {
|
||||
break
|
||||
}
|
||||
}
|
||||
return chain
|
||||
}
|
||||
|
||||
// GetTd retrieves a block's total difficulty in the canonical chain from the
|
||||
// database by hash, caching it if found.
|
||||
func (hc *HeaderChain) GetTd(hash common.Hash) *big.Int {
|
||||
// Short circuit if the td's already in the cache, retrieve otherwise
|
||||
if cached, ok := hc.tdCache.Get(hash); ok {
|
||||
return cached.(*big.Int)
|
||||
}
|
||||
td := GetTd(hc.chainDb, hash)
|
||||
if td == nil {
|
||||
return nil
|
||||
}
|
||||
// Cache the found body for next time and return
|
||||
hc.tdCache.Add(hash, td)
|
||||
return td
|
||||
}
|
||||
|
||||
// GetHeader retrieves a block header from the database by hash, caching it if
|
||||
// found.
|
||||
func (hc *HeaderChain) GetHeader(hash common.Hash) *types.Header {
|
||||
// Short circuit if the header's already in the cache, retrieve otherwise
|
||||
if header, ok := hc.headerCache.Get(hash); ok {
|
||||
return header.(*types.Header)
|
||||
}
|
||||
header := GetHeader(hc.chainDb, hash)
|
||||
if header == nil {
|
||||
return nil
|
||||
}
|
||||
// Cache the found header for next time and return
|
||||
hc.headerCache.Add(header.Hash(), header)
|
||||
return header
|
||||
}
|
||||
|
||||
// HasHeader checks if a block header is present in the database or not, caching
|
||||
// it if present.
|
||||
func (hc *HeaderChain) HasHeader(hash common.Hash) bool {
|
||||
return hc.GetHeader(hash) != nil
|
||||
}
|
||||
|
||||
// GetHeaderByNumber retrieves a block header from the database by number,
|
||||
// caching it (associated with its hash) if found.
|
||||
func (hc *HeaderChain) GetHeaderByNumber(number uint64) *types.Header {
|
||||
hash := GetCanonicalHash(hc.chainDb, number)
|
||||
if hash == (common.Hash{}) {
|
||||
return nil
|
||||
}
|
||||
return hc.GetHeader(hash)
|
||||
}
|
||||
|
||||
// CurrentHeader retrieves the current head header of the canonical chain. The
|
||||
// header is retrieved from the HeaderChain's internal cache.
|
||||
func (hc *HeaderChain) CurrentHeader() *types.Header {
|
||||
return hc.currentHeader
|
||||
}
|
||||
|
||||
// SetCurrentHeader sets the current head header of the canonical chain.
|
||||
func (hc *HeaderChain) SetCurrentHeader(head *types.Header) {
|
||||
if err := WriteHeadHeaderHash(hc.chainDb, head.Hash()); err != nil {
|
||||
glog.Fatalf("failed to insert head header hash: %v", err)
|
||||
}
|
||||
hc.currentHeader = head
|
||||
}
|
||||
|
||||
// DeleteCallback is a callback function that is called by SetHead before
|
||||
// each header is deleted.
|
||||
type DeleteCallback func(common.Hash)
|
||||
|
||||
// SetHead rewinds the local chain to a new head. Everything above the new head
|
||||
// will be deleted and the new one set.
|
||||
func (hc *HeaderChain) SetHead(head uint64, delFn DeleteCallback) {
|
||||
height := uint64(0)
|
||||
if hc.currentHeader != nil {
|
||||
height = hc.currentHeader.Number.Uint64()
|
||||
}
|
||||
|
||||
for hc.currentHeader != nil && hc.currentHeader.Number.Uint64() > head {
|
||||
hash := hc.currentHeader.Hash()
|
||||
if delFn != nil {
|
||||
delFn(hash)
|
||||
}
|
||||
DeleteHeader(hc.chainDb, hash)
|
||||
DeleteTd(hc.chainDb, hash)
|
||||
hc.currentHeader = hc.GetHeader(hc.currentHeader.ParentHash)
|
||||
}
|
||||
// Roll back the canonical chain numbering
|
||||
for i := height; i > head; i-- {
|
||||
DeleteCanonicalHash(hc.chainDb, i)
|
||||
}
|
||||
// Clear out any stale content from the caches
|
||||
hc.headerCache.Purge()
|
||||
hc.tdCache.Purge()
|
||||
|
||||
if hc.currentHeader == nil {
|
||||
hc.currentHeader = hc.genesisHeader
|
||||
}
|
||||
if err := WriteHeadHeaderHash(hc.chainDb, hc.currentHeader.Hash()); err != nil {
|
||||
glog.Fatalf("failed to reset head header hash: %v", err)
|
||||
}
|
||||
}
|
||||
|
||||
// SetGenesis sets a new genesis block header for the chain
|
||||
func (hc *HeaderChain) SetGenesis(head *types.Header) {
|
||||
hc.genesisHeader = head
|
||||
}
|
||||
|
||||
// headerValidator is responsible for validating block headers
|
||||
//
|
||||
// headerValidator implements HeaderValidator.
|
||||
type headerValidator struct {
|
||||
hc *HeaderChain // Canonical header chain
|
||||
Pow pow.PoW // Proof of work used for validating
|
||||
}
|
||||
|
||||
// NewBlockValidator returns a new block validator which is safe for re-use
|
||||
func NewHeaderValidator(chain *HeaderChain, pow pow.PoW) HeaderValidator {
|
||||
return &headerValidator{
|
||||
Pow: pow,
|
||||
hc: chain,
|
||||
}
|
||||
}
|
||||
|
||||
// ValidateHeader validates the given header and, depending on the pow arg,
|
||||
// checks the proof of work of the given header. Returns an error if the
|
||||
// validation failed.
|
||||
func (v *headerValidator) ValidateHeader(header, parent *types.Header, checkPow bool) error {
|
||||
// Short circuit if the parent is missing.
|
||||
if parent == nil {
|
||||
return ParentError(header.ParentHash)
|
||||
}
|
||||
// Short circuit if the header's already known or its parent missing
|
||||
if v.hc.HasHeader(header.Hash()) {
|
||||
return nil
|
||||
}
|
||||
return ValidateHeader(v.Pow, header, parent, checkPow, false)
|
||||
}
|
||||
|
|
@ -38,14 +38,22 @@ import (
|
|||
// ValidateHeader validates the given header and parent and returns an error
|
||||
// if it failed to do so.
|
||||
//
|
||||
// ValidateStack validates the given statedb and optionally the receipts and
|
||||
// ValidateState validates the given statedb and optionally the receipts and
|
||||
// gas used. The implementor should decide what to do with the given input.
|
||||
type Validator interface {
|
||||
HeaderValidator
|
||||
ValidateBlock(block *types.Block) error
|
||||
ValidateHeader(header, parent *types.Header, checkPow bool) error
|
||||
ValidateState(block, parent *types.Block, state *state.StateDB, receipts types.Receipts, usedGas *big.Int) error
|
||||
}
|
||||
|
||||
// HeaderValidator is an interface for validating headers only
|
||||
//
|
||||
// ValidateHeader validates the given header and parent and returns an error
|
||||
// if it failed to do so.
|
||||
type HeaderValidator interface {
|
||||
ValidateHeader(header, parent *types.Header, checkPow bool) error
|
||||
}
|
||||
|
||||
// Processor is an interface for processing blocks using a given initial state.
|
||||
//
|
||||
// Process takes the block to be processed and the statedb upon which the
|
||||
|
|
|
|||
Loading…
Reference in New Issue