Golang Block.Hash方法代码示例

func (self *Filter) getLogs(start, end uint64) (logs vm.Logs) {
	var block *types.Block

	for i := start; i <= end; i++ {
		hash := core.GetCanonicalHash(self.db, i)
		if hash != (common.Hash{}) {
			block = core.GetBlock(self.db, hash)
		} else { // block not found
			return logs
		}

		// Use bloom filtering to see if this block is interesting given the
		// current parameters
		if self.bloomFilter(block) {
			// Get the logs of the block
			var (
				receipts   = core.GetBlockReceipts(self.db, block.Hash())
				unfiltered vm.Logs
			)
			for _, receipt := range receipts {
				unfiltered = append(unfiltered, receipt.Logs...)
			}
			logs = append(logs, self.FilterLogs(unfiltered)...)
		}
	}

	return logs
}

// BroadcastBlock will either propagate a block to a subset of it's peers, or
// will only announce it's availability (depending what's requested).
func (pm *ProtocolManager) BroadcastBlock(block *types.Block, propagate bool) {
	hash := block.Hash()
	peers := pm.peers.PeersWithoutBlock(hash)

	// If propagation is requested, send to a subset of the peer
	if propagate {
		// Calculate the TD of the block (it's not imported yet, so block.Td is not valid)
		var td *big.Int
		if parent := pm.blockchain.GetBlock(block.ParentHash()); parent != nil {
			td = new(big.Int).Add(block.Difficulty(), pm.blockchain.GetTd(block.ParentHash()))
		} else {
			glog.V(logger.Error).Infof("propagating dangling block #%d [%x]", block.NumberU64(), hash[:4])
			return
		}
		// Send the block to a subset of our peers
		transfer := peers[:int(math.Sqrt(float64(len(peers))))]
		for _, peer := range transfer {
			peer.SendNewBlock(block, td)
		}
		glog.V(logger.Detail).Infof("propagated block %x to %d peers in %v", hash[:4], len(transfer), time.Since(block.ReceivedAt))
	}
	// Otherwise if the block is indeed in out own chain, announce it
	if pm.blockchain.HasBlock(hash) {
		for _, peer := range peers {
			if peer.version < eth62 {
				peer.SendNewBlockHashes61([]common.Hash{hash})
			} else {
				peer.SendNewBlockHashes([]common.Hash{hash}, []uint64{block.NumberU64()})
			}
		}
		glog.V(logger.Detail).Infof("announced block %x to %d peers in %v", hash[:4], len(peers), time.Since(block.ReceivedAt))
	}
}

// reportBlock reports the given block and error using the canonical block
// reporting tool. Reporting the block to the service is handled in a separate
// goroutine.
func reportBlock(block *types.Block, err error) {
	if glog.V(logger.Error) {
		glog.Errorf("Bad block #%v (%s)\n", block.Number(), block.Hash().Hex())
		glog.Errorf("    %v", err)
	}
	go ReportBlock(block, err)
}

// enqueue schedules a new future import operation, if the block to be imported
// has not yet been seen.
func (f *Fetcher) enqueue(peer string, block *types.Block) {
	hash := block.Hash()

	// Ensure the peer isn't DOSing us
	count := f.queues[peer] + 1
	if count > blockLimit {
		glog.V(logger.Debug).Infof("Peer %s: discarded block #%d [%x…], exceeded allowance (%d)", peer, block.NumberU64(), hash.Bytes()[:4], blockLimit)
		propBroadcastDOSMeter.Mark(1)
		f.forgetHash(hash)
		return
	}
	// Discard any past or too distant blocks
	if dist := int64(block.NumberU64()) - int64(f.chainHeight()); dist < -maxUncleDist || dist > maxQueueDist {
		glog.V(logger.Debug).Infof("Peer %s: discarded block #%d [%x…], distance %d", peer, block.NumberU64(), hash.Bytes()[:4], dist)
		propBroadcastDropMeter.Mark(1)
		f.forgetHash(hash)
		return
	}
	// Schedule the block for future importing
	if _, ok := f.queued[hash]; !ok {
		op := &inject{
			origin: peer,
			block:  block,
		}
		f.queues[peer] = count
		f.queued[hash] = op
		f.queue.Push(op, -float32(block.NumberU64()))
		if f.queueChangeHook != nil {
			f.queueChangeHook(op.block.Hash(), true)
		}
		if glog.V(logger.Debug) {
			glog.Infof("Peer %s: queued block #%d [%x…], total %v", peer, block.NumberU64(), hash.Bytes()[:4], f.queue.Size())
		}
	}
}

// newRPCTransaction returns a transaction that will serialize to the RPC representation.
func newRPCTransactionFromBlockIndex(b *types.Block, txIndex int) (*RPCTransaction, error) {
	if txIndex >= 0 && txIndex < len(b.Transactions()) {
		tx := b.Transactions()[txIndex]
		from, err := tx.From()
		if err != nil {
			return nil, err
		}

		return &RPCTransaction{
			BlockHash:        b.Hash(),
			BlockNumber:      rpc.NewHexNumber(b.Number()),
			From:             from,
			Gas:              rpc.NewHexNumber(tx.Gas()),
			GasPrice:         rpc.NewHexNumber(tx.GasPrice()),
			Hash:             tx.Hash(),
			Input:            fmt.Sprintf("0x%x", tx.Data()),
			Nonce:            rpc.NewHexNumber(tx.Nonce()),
			To:               tx.To(),
			TransactionIndex: rpc.NewHexNumber(txIndex),
			Value:            rpc.NewHexNumber(tx.Value()),
		}, nil
	}

	return nil, nil
}

// insert injects a new head block into the current block chain. This method
// assumes that the block is indeed a true head. It will also reset the head
// header and the head fast sync block to this very same block if they are older
// or if they are on a different side chain.
//
// Note, this function assumes that the `mu` mutex is held!
func (bc *BlockChain) insert(block *types.Block) {
	// If the block is on a side chain or an unknown one, force other heads onto it too
	updateHeads := GetCanonicalHash(bc.chainDb, block.NumberU64()) != block.Hash()

	// Add the block to the canonical chain number scheme and mark as the head
	if err := WriteCanonicalHash(bc.chainDb, block.Hash(), block.NumberU64()); err != nil {
		glog.Fatalf("failed to insert block number: %v", err)
	}
	if err := WriteHeadBlockHash(bc.chainDb, block.Hash()); err != nil {
		glog.Fatalf("failed to insert head block hash: %v", err)
	}
	bc.currentBlock = block

	// If the block is better than out head or is on a different chain, force update heads
	if updateHeads {
		if err := WriteHeadHeaderHash(bc.chainDb, block.Hash()); err != nil {
			glog.Fatalf("failed to insert head header hash: %v", err)
		}
		bc.currentHeader = block.Header()

		if err := WriteHeadFastBlockHash(bc.chainDb, block.Hash()); err != nil {
			glog.Fatalf("failed to insert head fast block hash: %v", err)
		}
		bc.currentFastBlock = block
	}
}

// returns the lowers possible price with which a tx was or could have been included
func (self *GasPriceOracle) lowestPrice(block *types.Block) *big.Int {
	gasUsed := big.NewInt(0)

	receipts := core.GetBlockReceipts(self.eth.ChainDb(), block.Hash())
	if len(receipts) > 0 {
		if cgu := receipts[len(receipts)-1].CumulativeGasUsed; cgu != nil {
			gasUsed = receipts[len(receipts)-1].CumulativeGasUsed
		}
	}

	if new(big.Int).Mul(gasUsed, big.NewInt(100)).Cmp(new(big.Int).Mul(block.GasLimit(),
		big.NewInt(int64(self.eth.GpoFullBlockRatio)))) < 0 {
		// block is not full, could have posted a tx with MinGasPrice
		return big.NewInt(0)
	}

	txs := block.Transactions()
	if len(txs) == 0 {
		return big.NewInt(0)
	}
	// block is full, find smallest gasPrice
	minPrice := txs[0].GasPrice()
	for i := 1; i < len(txs); i++ {
		price := txs[i].GasPrice()
		if price.Cmp(minPrice) < 0 {
			minPrice = price
		}
	}
	return minPrice
}

// WriteBlock serializes a block into the database, header and body separately.
func WriteBlock(db ethdb.Database, block *types.Block) error {
	// Store the body first to retain database consistency
	if err := WriteBody(db, block.Hash(), &types.Body{block.Transactions(), block.Uncles()}); err != nil {
		return err
	}
	// Store the header too, signaling full block ownership
	if err := WriteHeader(db, block.Header()); err != nil {
		return err
	}
	return nil
}

// rpcOutputBlock converts the given block to the RPC output which depends on fullTx. If inclTx is true transactions are
// returned. When fullTx is true the returned block contains full transaction details, otherwise it will only contain
// transaction hashes.
func (s *PublicBlockChainAPI) rpcOutputBlock(b *types.Block, inclTx bool, fullTx bool) (map[string]interface{}, error) {
	fields := map[string]interface{}{
		"number":           rpc.NewHexNumber(b.Number()),
		"hash":             b.Hash(),
		"parentHash":       b.ParentHash(),
		"nonce":            b.Header().Nonce,
		"sha3Uncles":       b.UncleHash(),
		"logsBloom":        b.Bloom(),
		"stateRoot":        b.Root(),
		"miner":            b.Coinbase(),
		"difficulty":       rpc.NewHexNumber(b.Difficulty()),
		"totalDifficulty":  rpc.NewHexNumber(s.bc.GetTd(b.Hash())),
		"extraData":        fmt.Sprintf("0x%x", b.Extra()),
		"size":             rpc.NewHexNumber(b.Size().Int64()),
		"gasLimit":         rpc.NewHexNumber(b.GasLimit()),
		"gasUsed":          rpc.NewHexNumber(b.GasUsed()),
		"timestamp":        rpc.NewHexNumber(b.Time()),
		"transactionsRoot": b.TxHash(),
		"receiptRoot":      b.ReceiptHash(),
	}

	if inclTx {
		formatTx := func(tx *types.Transaction) (interface{}, error) {
			return tx.Hash(), nil
		}

		if fullTx {
			formatTx = func(tx *types.Transaction) (interface{}, error) {
				return newRPCTransaction(b, tx.Hash())
			}
		}

		txs := b.Transactions()
		transactions := make([]interface{}, len(txs))
		var err error
		for i, tx := range b.Transactions() {
			if transactions[i], err = formatTx(tx); err != nil {
				return nil, err
			}
		}
		fields["transactions"] = transactions
	}

	uncles := b.Uncles()
	uncleHashes := make([]common.Hash, len(uncles))
	for i, uncle := range uncles {
		uncleHashes[i] = uncle.Hash()
	}
	fields["uncles"] = uncleHashes

	return fields, nil
}

// insert spawns a new goroutine to run a block insertion into the chain. If the
// block's number is at the same height as the current import phase, if updates
// the phase states accordingly.
func (f *Fetcher) insert(peer string, block *types.Block) {
	hash := block.Hash()

	// Run the import on a new thread
	glog.V(logger.Debug).Infof("Peer %s: importing block #%d [%x…]", peer, block.NumberU64(), hash[:4])
	go func() {
		defer func() { f.done <- hash }()

		// If the parent's unknown, abort insertion
		parent := f.getBlock(block.ParentHash())
		if parent == nil {
			glog.V(logger.Debug).Infof("Peer %s: parent []%x] of block #%d [%x…] unknown", block.ParentHash().Bytes()[:4], peer, block.NumberU64(), hash[:4])
			return
		}
		// Quickly validate the header and propagate the block if it passes
		switch err := f.validateBlock(block, parent); err {
		case nil:
			// All ok, quickly propagate to our peers
			propBroadcastOutTimer.UpdateSince(block.ReceivedAt)
			go f.broadcastBlock(block, true)

		case core.BlockFutureErr:
			// Weird future block, don't fail, but neither propagate

		default:
			// Something went very wrong, drop the peer
			glog.V(logger.Debug).Infof("Peer %s: block #%d [%x…] verification failed: %v", peer, block.NumberU64(), hash[:4], err)
			f.dropPeer(peer)
			return
		}
		// Run the actual import and log any issues
		if _, err := f.insertChain(types.Blocks{block}); err != nil {
			glog.V(logger.Warn).Infof("Peer %s: block #%d [%x…] import failed: %v", peer, block.NumberU64(), hash[:4], err)
			return
		}
		// If import succeeded, broadcast the block
		propAnnounceOutTimer.UpdateSince(block.ReceivedAt)
		go f.broadcastBlock(block, false)

		// Invoke the testing hook if needed
		if f.importedHook != nil {
			f.importedHook(block)
		}
	}()
}

func makeHeader(parent *types.Block, state *state.StateDB) *types.Header {
	var time *big.Int
	if parent.Time() == nil {
		time = big.NewInt(10)
	} else {
		time = new(big.Int).Add(parent.Time(), big.NewInt(10)) // block time is fixed at 10 seconds
	}
	return &types.Header{
		Root:       state.IntermediateRoot(),
		ParentHash: parent.Hash(),
		Coinbase:   parent.Coinbase(),
		Difficulty: CalcDifficulty(time.Uint64(), new(big.Int).Sub(time, big.NewInt(10)).Uint64(), parent.Number(), parent.Difficulty()),
		GasLimit:   CalcGasLimit(parent),
		GasUsed:    new(big.Int),
		Number:     new(big.Int).Add(parent.Number(), common.Big1),
		Time:       time,
	}
}

// ResetWithGenesisBlock purges the entire blockchain, restoring it to the
// specified genesis state.
func (bc *BlockChain) ResetWithGenesisBlock(genesis *types.Block) {
	// Dump the entire block chain and purge the caches
	bc.SetHead(0)

	bc.mu.Lock()
	defer bc.mu.Unlock()

	// Prepare the genesis block and reinitialise the chain
	if err := WriteTd(bc.chainDb, genesis.Hash(), genesis.Difficulty()); err != nil {
		glog.Fatalf("failed to write genesis block TD: %v", err)
	}
	if err := WriteBlock(bc.chainDb, genesis); err != nil {
		glog.Fatalf("failed to write genesis block: %v", err)
	}
	bc.genesisBlock = genesis
	bc.insert(bc.genesisBlock)
	bc.currentBlock = bc.genesisBlock
	bc.currentHeader = bc.genesisBlock.Header()
	bc.currentFastBlock = bc.genesisBlock
}

// WriteBlock writes the block to the chain.
func (self *BlockChain) WriteBlock(block *types.Block) (status writeStatus, err error) {
	self.wg.Add(1)
	defer self.wg.Done()

	// Calculate the total difficulty of the block
	ptd := self.GetTd(block.ParentHash())
	if ptd == nil {
		return NonStatTy, ParentError(block.ParentHash())
	}
	td := new(big.Int).Add(block.Difficulty(), ptd)

	// Make sure no inconsistent state is leaked during insertion
	self.mu.Lock()
	defer self.mu.Unlock()

	// If the total difficulty is higher than our known, add it to the canonical chain
	if td.Cmp(self.GetTd(self.currentBlock.Hash())) > 0 {
		// Reorganize the chain if the parent is not the head block
		if block.ParentHash() != self.currentBlock.Hash() {
			if err := self.reorg(self.currentBlock, block); err != nil {
				return NonStatTy, err
			}
		}
		// Insert the block as the new head of the chain
		self.insert(block)
		status = CanonStatTy
	} else {
		status = SideStatTy
	}
	// Irrelevant of the canonical status, write the block itself to the database
	if err := WriteTd(self.chainDb, block.Hash(), td); err != nil {
		glog.Fatalf("failed to write block total difficulty: %v", err)
	}
	if err := WriteBlock(self.chainDb, block); err != nil {
		glog.Fatalf("filed to write block contents: %v", err)
	}
	self.futureBlocks.Remove(block.Hash())

	return
}

// ValidateBlock validates the given block's header and uncles and verifies the
// the block header's transaction and uncle roots.
//
// ValidateBlock does not validate the header's pow. The pow work validated
// seperately so we can process them in paralel.
//
// ValidateBlock also validates and makes sure that any previous state (or present)
// state that might or might not be present is checked to make sure that fast
// sync has done it's job proper. This prevents the block validator form accepting
// false positives where a header is present but the state is not.
func (v *BlockValidator) ValidateBlock(block *types.Block) error {
	if v.bc.HasBlock(block.Hash()) {
		if _, err := state.New(block.Root(), v.bc.chainDb); err == nil {
			return &KnownBlockError{block.Number(), block.Hash()}
		}
	}
	parent := v.bc.GetBlock(block.ParentHash())
	if parent == nil {
		return ParentError(block.ParentHash())
	}
	if _, err := state.New(parent.Root(), v.bc.chainDb); err != nil {
		return ParentError(block.ParentHash())
	}

	header := block.Header()
	// validate the block header
	if err := ValidateHeader(v.Pow, header, parent.Header(), false, false); err != nil {
		return err
	}
	// verify the uncles are correctly rewarded
	if err := v.VerifyUncles(block, parent); err != nil {
		return err
	}

	// Verify UncleHash before running other uncle validations
	unclesSha := types.CalcUncleHash(block.Uncles())
	if unclesSha != header.UncleHash {
		return fmt.Errorf("invalid uncles root hash. received=%x calculated=%x", header.UncleHash, unclesSha)
	}

	// The transactions Trie's root (R = (Tr [[i, RLP(T1)], [i, RLP(T2)], ... [n, RLP(Tn)]]))
	// can be used by light clients to make sure they've received the correct Txs
	txSha := types.DeriveSha(block.Transactions())
	if txSha != header.TxHash {
		return fmt.Errorf("invalid transaction root hash. received=%x calculated=%x", header.TxHash, txSha)
	}

	return nil
}

// WriteTransactions stores the transactions associated with a specific block
// into the given database. Beside writing the transaction, the function also
// stores a metadata entry along with the transaction, detailing the position
// of this within the blockchain.
func WriteTransactions(db ethdb.Database, block *types.Block) error {
	batch := db.NewBatch()

	// Iterate over each transaction and encode it with its metadata
	for i, tx := range block.Transactions() {
		// Encode and queue up the transaction for storage
		data, err := rlp.EncodeToBytes(tx)
		if err != nil {
			return err
		}
		if err := batch.Put(tx.Hash().Bytes(), data); err != nil {
			return err
		}
		// Encode and queue up the transaction metadata for storage
		meta := struct {
			BlockHash  common.Hash
			BlockIndex uint64
			Index      uint64
		}{
			BlockHash:  block.Hash(),
			BlockIndex: block.NumberU64(),
			Index:      uint64(i),
		}
		data, err = rlp.EncodeToBytes(meta)
		if err != nil {
			return err
		}
		if err := batch.Put(append(tx.Hash().Bytes(), txMetaSuffix...), data); err != nil {
			return err
		}
	}
	// Write the scheduled data into the database
	if err := batch.Write(); err != nil {
		glog.Fatalf("failed to store transactions into database: %v", err)
		return err
	}
	return nil
}