ac527650eb
But don't change the way we process/store transactions and blocks. Effectively it's just an interface for smart contracts that replaces old syscalls. Transaction definition is moved temporarily to runtime package and Block definition is removed (till we solve #1691 properly).
226 lines
7.9 KiB
Go
226 lines
7.9 KiB
Go
package native
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import (
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"fmt"
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"math"
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"math/big"
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"github.com/nspcc-dev/neo-go/pkg/core/block"
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"github.com/nspcc-dev/neo-go/pkg/core/blockchainer"
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"github.com/nspcc-dev/neo-go/pkg/core/dao"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/callflag"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// Ledger provides an interface to blocks/transactions storage for smart
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// contracts. It's not a part of the proper chain's state, so it's just a
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// proxy between regular Blockchain/DAO interface and smart contracts.
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type Ledger struct {
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interop.ContractMD
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}
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const (
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ledgerContractID = -2
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prefixBlockHash = 9
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prefixCurrentBlock = 12
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prefixBlock = 5
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prefixTransaction = 11
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)
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// newLedger creates new Ledger native contract.
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func newLedger() *Ledger {
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var l = &Ledger{
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ContractMD: *interop.NewContractMD(nativenames.Ledger, ledgerContractID),
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}
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desc := newDescriptor("currentHash", smartcontract.Hash256Type)
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md := newMethodAndPrice(l.currentHash, 1000000, callflag.ReadStates)
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l.AddMethod(md, desc)
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desc = newDescriptor("currentIndex", smartcontract.IntegerType)
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md = newMethodAndPrice(l.currentIndex, 1000000, callflag.ReadStates)
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l.AddMethod(md, desc)
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desc = newDescriptor("getBlock", smartcontract.ArrayType,
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manifest.NewParameter("indexOrHash", smartcontract.ByteArrayType))
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md = newMethodAndPrice(l.getBlock, 1000000, callflag.ReadStates)
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l.AddMethod(md, desc)
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desc = newDescriptor("getTransaction", smartcontract.ArrayType,
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manifest.NewParameter("hash", smartcontract.ByteArrayType))
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md = newMethodAndPrice(l.getTransaction, 1000000, callflag.ReadStates)
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l.AddMethod(md, desc)
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desc = newDescriptor("getTransactionHeight", smartcontract.IntegerType,
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manifest.NewParameter("hash", smartcontract.ByteArrayType))
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md = newMethodAndPrice(l.getTransactionHeight, 1000000, callflag.ReadStates)
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l.AddMethod(md, desc)
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desc = newDescriptor("getTransactionFromBlock", smartcontract.ArrayType,
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manifest.NewParameter("blockIndexOrHash", smartcontract.ByteArrayType),
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manifest.NewParameter("txIndex", smartcontract.IntegerType))
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md = newMethodAndPrice(l.getTransactionFromBlock, 2000000, callflag.ReadStates)
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l.AddMethod(md, desc)
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return l
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}
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// Metadata implements Contract interface.
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func (l *Ledger) Metadata() *interop.ContractMD {
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return &l.ContractMD
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}
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// Initialize implements Contract interface.
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func (l *Ledger) Initialize(ic *interop.Context) error {
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return nil
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}
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// OnPersist implements Contract interface.
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func (l *Ledger) OnPersist(ic *interop.Context) error {
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// Actual block/tx processing is done in Blockchain.storeBlock().
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// Even though C# node add them to storage here, they're not
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// accessible to smart contracts (see isTraceableBlock()), thus
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// the end effect is the same.
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return nil
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}
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// PostPersist implements Contract interface.
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func (l *Ledger) PostPersist(ic *interop.Context) error {
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return nil // Actual block/tx processing is done in Blockchain.storeBlock().
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}
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// currentHash implements currentHash SC method.
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func (l *Ledger) currentHash(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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return stackitem.Make(ic.Chain.CurrentBlockHash().BytesBE())
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}
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// currentIndex implements currentIndex SC method.
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func (l *Ledger) currentIndex(ic *interop.Context, _ []stackitem.Item) stackitem.Item {
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return stackitem.Make(ic.Chain.BlockHeight())
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}
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// getBlock implements getBlock SC method.
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func (l *Ledger) getBlock(ic *interop.Context, params []stackitem.Item) stackitem.Item {
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hash := getBlockHashFromItem(ic.Chain, params[0])
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block, err := ic.Chain.GetBlock(hash)
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if err != nil || !isTraceableBlock(ic.Chain, block.Index) {
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return stackitem.Null{}
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}
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return BlockToStackItem(block)
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}
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// getTransaction returns transaction to the SC.
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func (l *Ledger) getTransaction(ic *interop.Context, params []stackitem.Item) stackitem.Item {
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tx, h, err := getTransactionAndHeight(ic.DAO, params[0])
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if err != nil || !isTraceableBlock(ic.Chain, h) {
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return stackitem.Null{}
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}
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return TransactionToStackItem(tx)
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}
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// getTransactionHeight returns transaction height to the SC.
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func (l *Ledger) getTransactionHeight(ic *interop.Context, params []stackitem.Item) stackitem.Item {
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_, h, err := getTransactionAndHeight(ic.DAO, params[0])
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if err != nil || !isTraceableBlock(ic.Chain, h) {
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return stackitem.Make(-1)
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}
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return stackitem.Make(h)
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}
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// getTransactionFromBlock returns transaction with the given index from the
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// block with height or hash specified.
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func (l *Ledger) getTransactionFromBlock(ic *interop.Context, params []stackitem.Item) stackitem.Item {
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hash := getBlockHashFromItem(ic.Chain, params[0])
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index := toUint32(params[1])
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block, err := ic.Chain.GetBlock(hash)
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if err != nil || !isTraceableBlock(ic.Chain, block.Index) {
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return stackitem.Null{}
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}
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if index >= uint32(len(block.Transactions)) {
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panic("wrong transaction index")
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}
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return TransactionToStackItem(block.Transactions[index])
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}
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// isTraceableBlock defines whether we're able to give information about
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// the block with index specified.
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func isTraceableBlock(bc blockchainer.Blockchainer, index uint32) bool {
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height := bc.BlockHeight()
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MaxTraceableBlocks := bc.GetConfig().MaxTraceableBlocks
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return index <= height && index+MaxTraceableBlocks > height
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}
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// getBlockHashFromItem converts given stackitem.Item to block hash using given
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// Blockchainer if needed. Interop functions accept both block numbers and
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// block hashes as parameters, thus this function is needed. It's supposed to
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// be called within VM context, so it panics if anything goes wrong.
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func getBlockHashFromItem(bc blockchainer.Blockchainer, item stackitem.Item) util.Uint256 {
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bigindex, err := item.TryInteger()
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if err == nil && bigindex.IsInt64() {
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index := bigindex.Int64()
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if index < 0 || index > math.MaxUint32 {
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panic("bad block index")
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}
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if uint32(index) > bc.BlockHeight() {
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panic(fmt.Errorf("no block with index %d", index))
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}
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return bc.GetHeaderHash(int(index))
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}
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bytes, err := item.TryBytes()
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if err != nil {
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panic(err)
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}
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hash, err := util.Uint256DecodeBytesBE(bytes)
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if err != nil {
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panic(err)
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}
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return hash
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}
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// getTransactionAndHeight returns transaction and its height if it's present
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// on the chain. It panics if anything goes wrong.
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func getTransactionAndHeight(cd *dao.Cached, item stackitem.Item) (*transaction.Transaction, uint32, error) {
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hashbytes, err := item.TryBytes()
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if err != nil {
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panic(err)
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}
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hash, err := util.Uint256DecodeBytesBE(hashbytes)
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if err != nil {
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panic(err)
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}
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return cd.GetTransaction(hash)
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}
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// BlockToStackItem converts block.Block to stackitem.Item
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func BlockToStackItem(b *block.Block) stackitem.Item {
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return stackitem.NewArray([]stackitem.Item{
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stackitem.NewByteArray(b.Hash().BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(b.Version))),
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stackitem.NewByteArray(b.PrevHash.BytesBE()),
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stackitem.NewByteArray(b.MerkleRoot.BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(b.Timestamp))),
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stackitem.NewBigInteger(big.NewInt(int64(b.Index))),
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stackitem.NewByteArray(b.NextConsensus.BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(len(b.Transactions)))),
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})
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}
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// TransactionToStackItem converts transaction.Transaction to stackitem.Item
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func TransactionToStackItem(t *transaction.Transaction) stackitem.Item {
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return stackitem.NewArray([]stackitem.Item{
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stackitem.NewByteArray(t.Hash().BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(t.Version))),
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stackitem.NewBigInteger(big.NewInt(int64(t.Nonce))),
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stackitem.NewByteArray(t.Sender().BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(t.SystemFee))),
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stackitem.NewBigInteger(big.NewInt(int64(t.NetworkFee))),
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stackitem.NewBigInteger(big.NewInt(int64(t.ValidUntilBlock))),
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stackitem.NewByteArray(t.Script),
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})
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}
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