Golang Block.Transactions方法代码示例

// Creates a new QML Block from a chain block
func NewBlock(block *types.Block) *Block {
	if block == nil {
		return &Block{}
	}

	ptxs := make([]*Transaction, len(block.Transactions()))
	/*
		for i, tx := range block.Transactions() {
			ptxs[i] = NewTx(tx)
		}
	*/
	txlist := common.NewList(ptxs)

	puncles := make([]*Block, len(block.Uncles()))
	/*
		for i, uncle := range block.Uncles() {
			puncles[i] = NewBlock(types.NewBlockWithHeader(uncle))
		}
	*/
	ulist := common.NewList(puncles)

	return &Block{
		ref: block, Size: block.Size().String(),
		Number: int(block.NumberU64()), GasUsed: block.GasUsed().String(),
		GasLimit: block.GasLimit().String(), Hash: block.Hash().Hex(),
		Transactions: txlist, Uncles: ulist,
		Time:     block.Time(),
		Coinbase: block.Coinbase().Hex(),
		PrevHash: block.ParentHash().Hex(),
		Bloom:    common.ToHex(block.Bloom().Bytes()),
		Raw:      block.String(),
	}
}

// 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 := self.eth.BlockProcessor().GetBlockReceipts(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
}

func (self *SQLDB) InsertBlock(block *types.Block) {
	tx, err := self.db.Begin()
	if err != nil {
		glog.V(logger.Error).Infoln("SQL DB Begin:", err)
		return
	}

	stmtBlock, err := tx.Prepare(`insert or replace into shift_blocks(number, hash) values(?, ?)`)
	if err != nil {
		glog.V(logger.Error).Infoln("SQL DB:", err)
		return
	}
	defer stmtBlock.Close()

	stmtTrans, err := tx.Prepare(`insert or replace into shift_transactions(hash, blocknumber, sender, receiver) values(?, ?, ?, ?)`)
	if err != nil {
		glog.V(logger.Error).Infoln("SQL DB:", err)
		return
	}
	defer stmtTrans.Close()

	// block
	_, err = stmtBlock.Exec(block.Number().Uint64(), block.Hash().Hex())
	if err != nil {
		glog.V(logger.Error).Infoln("SQL DB:", err)
		tx.Rollback()
		return
	}
	// transactions

	for _, trans := range block.Transactions() {
		sender, err := trans.From()
		if err != nil {
			glog.V(logger.Error).Infoln("SQL DB:", err)
			continue
		}
		senderHex := sender.Hex()
		receiver := trans.To()
		receiverHex := ""
		if receiver != nil {
			receiverHex = receiver.Hex()
		}

		_, err = stmtTrans.Exec(trans.Hash().Hex(), block.Number().Uint64(), senderHex, receiverHex)
		if err != nil {
			glog.V(logger.Error).Infoln("SQL DB:", err)
			tx.Rollback()
			return
		}
	}

	tx.Commit()
}

func (sm *BlockProcessor) TransitionState(statedb *state.StateDB, parent, block *types.Block, transientProcess bool) (receipts types.Receipts, err error) {
	gp := statedb.GetOrNewStateObject(block.Coinbase())
	gp.SetGasLimit(block.GasLimit())

	// Process the transactions on to parent state
	receipts, err = sm.ApplyTransactions(gp, statedb, block, block.Transactions(), transientProcess)
	if err != nil {
		return nil, err
	}

	return receipts, nil
}

// PutTransactions stores the transactions in the given database
func PutTransactions(db common.Database, block *types.Block, txs types.Transactions) {
	batch := new(leveldb.Batch)
	_, batchWrite := db.(*ethdb.LDBDatabase)

	for i, tx := range block.Transactions() {
		rlpEnc, err := rlp.EncodeToBytes(tx)
		if err != nil {
			glog.V(logger.Debug).Infoln("Failed encoding tx", err)
			return
		}

		if batchWrite {
			batch.Put(tx.Hash().Bytes(), rlpEnc)
		} else {
			db.Put(tx.Hash().Bytes(), rlpEnc)
		}

		var txExtra struct {
			BlockHash  common.Hash
			BlockIndex uint64
			Index      uint64
		}
		txExtra.BlockHash = block.Hash()
		txExtra.BlockIndex = block.NumberU64()
		txExtra.Index = uint64(i)
		rlpMeta, err := rlp.EncodeToBytes(txExtra)
		if err != nil {
			glog.V(logger.Debug).Infoln("Failed encoding tx meta data", err)
			return
		}

		if batchWrite {
			batch.Put(append(tx.Hash().Bytes(), 0x0001), rlpMeta)
		} else {
			db.Put(append(tx.Hash().Bytes(), 0x0001), rlpMeta)
		}
	}

	if db, ok := db.(*ethdb.LDBDatabase); ok {
		if err := db.LDB().Write(batch, nil); err != nil {
			glog.V(logger.Error).Infoln("db write err:", err)
		}
	}
}

func NewBlockRes(block *types.Block, fullTx bool) *BlockRes {
	if block == nil {
		return nil
	}

	res := new(BlockRes)
	res.fullTx = fullTx
	res.BlockNumber = newHexNum(block.Number())
	res.BlockHash = newHexData(block.Hash())
	res.ParentHash = newHexData(block.ParentHash())
	res.Nonce = newHexData(block.Nonce())
	res.Sha3Uncles = newHexData(block.UncleHash())
	res.LogsBloom = newHexData(block.Bloom())
	res.TransactionRoot = newHexData(block.TxHash())
	res.StateRoot = newHexData(block.Root())
	res.Miner = newHexData(block.Coinbase())
	res.Difficulty = newHexNum(block.Difficulty())
	res.TotalDifficulty = newHexNum(block.Td)
	res.Size = newHexNum(block.Size().Int64())
	res.ExtraData = newHexData(block.Extra())
	res.GasLimit = newHexNum(block.GasLimit())
	res.GasUsed = newHexNum(block.GasUsed())
	res.UnixTimestamp = newHexNum(block.Time())

	txs := block.Transactions()
	res.Transactions = make([]*TransactionRes, len(txs))
	for i, tx := range txs {
		res.Transactions[i] = NewTransactionRes(tx)
		res.Transactions[i].BlockHash = res.BlockHash
		res.Transactions[i].BlockNumber = res.BlockNumber
		res.Transactions[i].TxIndex = newHexNum(i)
	}

	uncles := block.Uncles()
	res.Uncles = make([]*UncleRes, len(uncles))
	for i, uncle := range uncles {
		res.Uncles[i] = NewUncleRes(uncle)
	}

	return res
}

// reorgs takes two blocks, an old chain and a new chain and will reconstruct the blocks and inserts them
// to be part of the new canonical chain and accumulates potential missing transactions and post an
// event about them
func (self *ChainManager) reorg(oldBlock, newBlock *types.Block) error {
	self.mu.Lock()
	defer self.mu.Unlock()

	var (
		newChain    types.Blocks
		commonBlock *types.Block
		oldStart    = oldBlock
		newStart    = newBlock
		deletedTxs  types.Transactions
		addedTxs    types.Transactions
	)

	// first reduce whoever is higher bound
	if oldBlock.NumberU64() > newBlock.NumberU64() {
		// reduce old chain
		for oldBlock = oldBlock; oldBlock != nil && oldBlock.NumberU64() != newBlock.NumberU64(); oldBlock = self.GetBlock(oldBlock.ParentHash()) {
			deletedTxs = append(deletedTxs, oldBlock.Transactions()...)
		}
	} else {
		// reduce new chain and append new chain blocks for inserting later on
		for newBlock = newBlock; newBlock != nil && newBlock.NumberU64() != oldBlock.NumberU64(); newBlock = self.GetBlock(newBlock.ParentHash()) {
			newChain = append(newChain, newBlock)
		}
	}
	if oldBlock == nil {
		return fmt.Errorf("Invalid old chain")
	}
	if newBlock == nil {
		return fmt.Errorf("Invalid new chain")
	}

	numSplit := newBlock.Number()
	for {
		if oldBlock.Hash() == newBlock.Hash() {
			commonBlock = oldBlock
			break
		}
		newChain = append(newChain, newBlock)

		oldBlock, newBlock = self.GetBlock(oldBlock.ParentHash()), self.GetBlock(newBlock.ParentHash())
		if oldBlock == nil {
			return fmt.Errorf("Invalid old chain")
		}
		if newBlock == nil {
			return fmt.Errorf("Invalid new chain")
		}
		deletedTxs = append(deletedTxs, oldBlock.Transactions()...)
	}

	if glog.V(logger.Debug) {
		commonHash := commonBlock.Hash()
		glog.Infof("Chain split detected @ %x. Reorganising chain from #%v %x to %x", commonHash[:4], numSplit, oldStart.Hash().Bytes()[:4], newStart.Hash().Bytes()[:4])
	}

	// insert blocks. Order does not matter. Last block will be written in ImportChain itself which creates the new head properly
	for _, block := range newChain {
		// insert the block in the canonical way, re-writing history
		self.insert(block)
		// write canonical receipts and transactions
		PutTransactions(self.chainDb, block, block.Transactions())
		PutReceipts(self.chainDb, GetBlockReceipts(self.chainDb, block.Hash()))

		addedTxs = append(addedTxs, block.Transactions()...)
	}

	var diff types.Transactions
	diff.Difference(deletedTxs, addedTxs)
	self.eventMux.Post(RemovedTransactionEvent{diff})

	return nil
}

func (sm *BlockProcessor) processWithParent(block, parent *types.Block) (logs state.Logs, receipts types.Receipts, err error) {
	// Create a new state based on the parent's root (e.g., create copy)
	state := state.New(parent.Root(), sm.chainDb)
	header := block.Header()
	uncles := block.Uncles()
	txs := block.Transactions()

	// Block validation
	if err = ValidateHeader(sm.Pow, header, parent, false, false); err != nil {
		return
	}

	// There can be at most two uncles
	if len(uncles) > 2 {
		return nil, nil, ValidationError("Block can only contain maximum 2 uncles (contained %v)", len(uncles))
	}

	receipts, err = sm.TransitionState(state, parent, block, false)
	if err != nil {
		return
	}

	// Validate the received block's bloom with the one derived from the generated receipts.
	// For valid blocks this should always validate to true.
	rbloom := types.CreateBloom(receipts)
	if rbloom != header.Bloom {
		err = fmt.Errorf("unable to replicate block's bloom=%x", rbloom)
		return
	}

	// 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(txs)
	if txSha != header.TxHash {
		err = fmt.Errorf("invalid transaction root hash. received=%x calculated=%x", header.TxHash, txSha)
		return
	}

	// Tre receipt Trie's root (R = (Tr [[H1, R1], ... [Hn, R1]]))
	receiptSha := types.DeriveSha(receipts)
	if receiptSha != header.ReceiptHash {
		err = fmt.Errorf("invalid receipt root hash. received=%x calculated=%x", header.ReceiptHash, receiptSha)
		return
	}

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

	// Verify uncles
	if err = sm.VerifyUncles(state, block, parent); err != nil {
		return
	}
	// Accumulate static rewards; block reward, uncle's and uncle inclusion.
	AccumulateRewards(state, header, uncles)

	// Commit state objects/accounts to a temporary trie (does not save)
	// used to calculate the state root.
	state.SyncObjects()
	if header.Root != state.Root() {
		err = fmt.Errorf("invalid merkle root. received=%x got=%x", header.Root, state.Root())
		return
	}

	// Sync the current block's state to the database
	state.Sync()

	return state.Logs(), receipts, nil
}