Golang common.CopyBytes函數代碼示例

func TestReset(t *testing.T) {
	trie := NewEmpty()
	vals := []struct{ k, v string }{
		{"do", "verb"},
		{"ether", "wookiedoo"},
		{"horse", "stallion"},
	}
	for _, val := range vals {
		trie.UpdateString(val.k, val.v)
	}
	trie.Commit()

	before := common.CopyBytes(trie.roothash)
	trie.UpdateString("should", "revert")
	trie.Hash()
	// Should have no effect
	trie.Hash()
	trie.Hash()
	// ###

	trie.Reset()
	after := common.CopyBytes(trie.roothash)

	if !bytes.Equal(before, after) {
		t.Errorf("expected roots to be equal. %x - %x", before, after)
	}
}

func (b *memBatch) Put(key, value []byte) error {
	b.lock.Lock()
	defer b.lock.Unlock()

	b.writes = append(b.writes, kv{common.CopyBytes(key), common.CopyBytes(value)})
	return nil
}

func (self *StateObject) Copy() *StateObject {
	stateObject := NewStateObject(self.Address(), self.db)
	stateObject.balance.Set(self.balance)
	stateObject.codeHash = common.CopyBytes(self.codeHash)
	stateObject.nonce = self.nonce
	stateObject.trie = self.trie
	stateObject.code = common.CopyBytes(self.code)
	stateObject.initCode = common.CopyBytes(self.initCode)
	stateObject.storage = self.storage.Copy()
	stateObject.remove = self.remove
	stateObject.dirty = self.dirty
	stateObject.deleted = self.deleted

	return stateObject
}

func NewTransaction(nonce uint64, to common.Address, amount, gasLimit, gasPrice *big.Int, data []byte) *Transaction {
	if len(data) > 0 {
		data = common.CopyBytes(data)
	}
	d := txdata{
		AccountNonce: nonce,
		Recipient:    &to,
		Payload:      data,
		Amount:       new(big.Int),
		GasLimit:     new(big.Int),
		Price:        new(big.Int),
		R:            new(big.Int),
		S:            new(big.Int),
	}
	if amount != nil {
		d.Amount.Set(amount)
	}
	if gasLimit != nil {
		d.GasLimit.Set(gasLimit)
	}
	if gasPrice != nil {
		d.Price.Set(gasPrice)
	}
	return &Transaction{data: d}
}

func (self *StateObject) Copy() *StateObject {
	stateObject := NewStateObject(self.Address(), self.db)
	stateObject.balance.Set(self.balance)
	stateObject.codeHash = common.CopyBytes(self.codeHash)
	stateObject.nonce = self.nonce
	if self.State != nil {
		stateObject.State = self.State.Copy()
	}
	stateObject.code = common.CopyBytes(self.code)
	stateObject.initCode = common.CopyBytes(self.initCode)
	stateObject.storage = self.storage.Copy()
	stateObject.gasPool.Set(self.gasPool)
	stateObject.remove = self.remove
	stateObject.dirty = self.dirty

	return stateObject
}

// TryUpdate associates key with value in the trie. Subsequent calls to
// Get will return value. If value has length zero, any existing value
// is deleted from the trie and calls to Get will return nil.
//
// The value bytes must not be modified by the caller while they are
// stored in the trie.
//
// If a node was not found in the database, a MissingNodeError is returned.
func (t *SecureTrie) TryUpdate(key, value []byte) error {
	hk := t.hashKey(key)
	err := t.Trie.TryUpdate(hk, value)
	if err != nil {
		return err
	}
	t.secKeyCache[string(hk)] = common.CopyBytes(key)
	return nil
}

func NewContractCreation(nonce uint64, amount, gasLimit, gasPrice *big.Int, data []byte) *Transaction {
	if len(data) > 0 {
		data = common.CopyBytes(data)
	}
	return &Transaction{data: txdata{
		AccountNonce: nonce,
		Recipient:    nil,
		Amount:       new(big.Int).Set(amount),
		GasLimit:     new(big.Int).Set(gasLimit),
		Price:        new(big.Int).Set(gasPrice),
		Payload:      data,
		R:            new(big.Int),
		S:            new(big.Int),
	}}
}

// GenerateChain creates a chain of n blocks. The first block's
// parent will be the provided parent. db is used to store
// intermediate states and should contain the parent's state trie.
//
// The generator function is called with a new block generator for
// every block. Any transactions and uncles added to the generator
// become part of the block. If gen is nil, the blocks will be empty
// and their coinbase will be the zero address.
//
// Blocks created by GenerateChain do not contain valid proof of work
// values. Inserting them into BlockChain requires use of FakePow or
// a similar non-validating proof of work implementation.
func GenerateChain(config *ChainConfig, parent *types.Block, db ethdb.Database, n int, gen func(int, *BlockGen)) ([]*types.Block, []types.Receipts) {
	blocks, receipts := make(types.Blocks, n), make([]types.Receipts, n)
	genblock := func(i int, h *types.Header, statedb *state.StateDB) (*types.Block, types.Receipts) {
		b := &BlockGen{parent: parent, i: i, chain: blocks, header: h, statedb: statedb}

		// Mutate the state and block according to any hard-fork specs
		if config == nil {
			config = MakeChainConfig()
		}
		if daoBlock := config.DAOForkBlock; daoBlock != nil {
			limit := new(big.Int).Add(daoBlock, params.DAOForkExtraRange)
			if h.Number.Cmp(daoBlock) >= 0 && h.Number.Cmp(limit) < 0 {
				if config.DAOForkSupport {
					h.Extra = common.CopyBytes(params.DAOForkBlockExtra)
				}
			}
		}
		if config.DAOForkSupport && config.DAOForkBlock != nil && config.DAOForkBlock.Cmp(h.Number) == 0 {
			ApplyDAOHardFork(statedb)
		}
		// Execute any user modifications to the block and finalize it
		if gen != nil {
			gen(i, b)
		}
		AccumulateRewards(statedb, h, b.uncles)
		root, err := statedb.Commit()
		if err != nil {
			panic(fmt.Sprintf("state write error: %v", err))
		}
		h.Root = root
		return types.NewBlock(h, b.txs, b.uncles, b.receipts), b.receipts
	}
	for i := 0; i < n; i++ {
		statedb, err := state.New(parent.Root(), db)
		if err != nil {
			panic(err)
		}
		header := makeHeader(parent, statedb)
		block, receipt := genblock(i, header, statedb)
		blocks[i] = block
		receipts[i] = receipt
		parent = block
	}
	return blocks, receipts
}

// hashChildren replaces the children of a node with their hashes if the encoded
// size of the child is larger than a hash, returning the collapsed node as well
// as a replacement for the original node with the child hashes cached in.
func (h *hasher) hashChildren(original node, db DatabaseWriter) (node, node, error) {
	var err error

	switch n := original.(type) {
	case shortNode:
		// Hash the short node's child, caching the newly hashed subtree
		cached := n
		cached.Key = common.CopyBytes(cached.Key)

		n.Key = compactEncode(n.Key)
		if _, ok := n.Val.(valueNode); !ok {
			if n.Val, cached.Val, err = h.hash(n.Val, db, false); err != nil {
				return n, original, err
			}
		}
		if n.Val == nil {
			n.Val = valueNode(nil) // Ensure that nil children are encoded as empty strings.
		}
		return n, cached, nil

	case fullNode:
		// Hash the full node's children, caching the newly hashed subtrees
		cached := fullNode{dirty: n.dirty}

		for i := 0; i < 16; i++ {
			if n.Children[i] != nil {
				if n.Children[i], cached.Children[i], err = h.hash(n.Children[i], db, false); err != nil {
					return n, original, err
				}
			} else {
				n.Children[i] = valueNode(nil) // Ensure that nil children are encoded as empty strings.
			}
		}
		cached.Children[16] = n.Children[16]
		if n.Children[16] == nil {
			n.Children[16] = valueNode(nil)
		}
		return n, cached, nil

	default:
		// Value and hash nodes don't have children so they're left as were
		return n, original, nil
	}
}

func (self *ShortNode) Copy(t *Trie) Node {
	node := &ShortNode{t, nil, self.value.Copy(t), self.dirty}
	node.key = common.CopyBytes(self.key)
	node.dirty = true
	return node
}

func (self *worker) commitNewWork() {
	self.mu.Lock()
	defer self.mu.Unlock()
	self.uncleMu.Lock()
	defer self.uncleMu.Unlock()
	self.currentMu.Lock()
	defer self.currentMu.Unlock()

	tstart := time.Now()
	parent := self.chain.CurrentBlock()
	tstamp := tstart.Unix()
	if parent.Time().Cmp(new(big.Int).SetInt64(tstamp)) >= 0 {
		tstamp = parent.Time().Int64() + 1
	}
	// this will ensure we're not going off too far in the future
	if now := time.Now().Unix(); tstamp > now+4 {
		wait := time.Duration(tstamp-now) * time.Second
		glog.V(logger.Info).Infoln("We are too far in the future. Waiting for", wait)
		time.Sleep(wait)
	}

	num := parent.Number()
	header := &types.Header{
		ParentHash: parent.Hash(),
		Number:     num.Add(num, common.Big1),
		Difficulty: core.CalcDifficulty(self.config, uint64(tstamp), parent.Time().Uint64(), parent.Number(), parent.Difficulty()),
		GasLimit:   core.CalcGasLimit(parent),
		GasUsed:    new(big.Int),
		Coinbase:   self.coinbase,
		Extra:      self.extra,
		Time:       big.NewInt(tstamp),
	}
	// If we are care about TheDAO hard-fork check whether to override the extra-data or not
	if daoBlock := self.config.DAOForkBlock; daoBlock != nil {
		// Check whether the block is among the fork extra-override range
		limit := new(big.Int).Add(daoBlock, params.DAOForkExtraRange)
		if header.Number.Cmp(daoBlock) >= 0 && header.Number.Cmp(limit) < 0 {
			// Depending whether we support or oppose the fork, override differently
			if self.config.DAOForkSupport {
				header.Extra = common.CopyBytes(params.DAOForkBlockExtra)
			} else if bytes.Compare(header.Extra, params.DAOForkBlockExtra) == 0 {
				header.Extra = []byte{} // If miner opposes, don't let it use the reserved extra-data
			}
		}
	}
	previous := self.current
	// Could potentially happen if starting to mine in an odd state.
	err := self.makeCurrent(parent, header)
	if err != nil {
		glog.V(logger.Info).Infoln("Could not create new env for mining, retrying on next block.")
		return
	}
	// Create the current work task and check any fork transitions needed
	work := self.current
	if self.config.DAOForkSupport && self.config.DAOForkBlock != nil && self.config.DAOForkBlock.Cmp(header.Number) == 0 {
		core.ApplyDAOHardFork(work.state)
	}

	/* //approach 1
	transactions := self.eth.TxPool().GetTransactions()
	sort.Sort(types.TxByNonce(transactions))
	*/

	//approach 2
	transactions := self.eth.TxPool().GetTransactions()
	types.SortByPriceAndNonce(transactions)

	/* // approach 3
	// commit transactions for this run.
	txPerOwner := make(map[common.Address]types.Transactions)
	// Sort transactions by owner
	for _, tx := range self.eth.TxPool().GetTransactions() {
		from, _ := tx.From() // we can ignore the sender error
		txPerOwner[from] = append(txPerOwner[from], tx)
	}
	var (
		singleTxOwner types.Transactions
		multiTxOwner  types.Transactions
	)
	// Categorise transactions by
	// 1. 1 owner tx per block
	// 2. multi txs owner per block
	for _, txs := range txPerOwner {
		if len(txs) == 1 {
			singleTxOwner = append(singleTxOwner, txs[0])
		} else {
			multiTxOwner = append(multiTxOwner, txs...)
		}
	}
	sort.Sort(types.TxByPrice(singleTxOwner))
	sort.Sort(types.TxByNonce(multiTxOwner))
	transactions := append(singleTxOwner, multiTxOwner...)
	*/

	work.commitTransactions(self.mux, transactions, self.gasPrice, self.chain)
	self.eth.TxPool().RemoveTransactions(work.lowGasTxs)

	// compute uncles for the new block.
	var (
		uncles    []*types.Header
//.........這裏部分代碼省略.........

func (self *HashNode) Copy(t *Trie) Node { return NewHash(common.CopyBytes(self.key), t) }

func (self *ShortNode) Copy(t *Trie) Node {
	node := &ShortNode{t, nil, self.value.Copy(t)}
	node.key = common.CopyBytes(self.key)
	return node
}

func (w *memBatch) Put(key, value []byte) error {
	w.writes = append(w.writes, kv{key, common.CopyBytes(value)})
	return nil
}

func (b *Block) Extra() []byte            { return common.CopyBytes(b.header.Extra) }