221 lines
7.8 KiB
Go
221 lines
7.8 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 ledgerContractID = -4
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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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defer l.UpdateHash()
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desc := newDescriptor("currentHash", smartcontract.Hash256Type)
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md := newMethodAndPrice(l.currentHash, 1<<15, 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, 1<<15, 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, 1<<15, 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.Hash256Type))
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md = newMethodAndPrice(l.getTransaction, 1<<15, 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.Hash256Type))
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md = newMethodAndPrice(l.getTransactionHeight, 1<<15, 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, 1<<16, 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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