232 lines
8 KiB
Go
232 lines
8 KiB
Go
package native
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import (
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"fmt"
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"math"
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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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"github.com/nspcc-dev/neo-go/pkg/vm/vmstate"
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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 a 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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desc = newDescriptor("getTransactionSigners", smartcontract.ArrayType,
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manifest.NewParameter("hash", smartcontract.Hash256Type))
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md = newMethodAndPrice(l.getTransactionSigners, 1<<15, callflag.ReadStates)
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l.AddMethod(md, desc)
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desc = newDescriptor("getTransactionVMState", smartcontract.IntegerType,
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manifest.NewParameter("hash", smartcontract.Hash256Type))
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md = newMethodAndPrice(l.getTransactionVMState, 1<<15, 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 the 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 the 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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// InitializeCache implements the Contract interface.
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func (l *Ledger) InitializeCache(blockHeight uint32, d *dao.Simple) error {
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return nil
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}
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// OnPersist implements the 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 the 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.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.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, params[0])
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block, err := ic.GetBlock(hash)
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if err != nil || !isTraceableBlock(ic, block.Index) {
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return stackitem.Null{}
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}
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return block.ToStackItem()
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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, h) {
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return stackitem.Null{}
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}
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return tx.ToStackItem()
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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, 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 a transaction with the given index from the
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// block with the 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, params[0])
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index := toUint32(params[1])
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block, err := ic.GetBlock(hash)
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if err != nil || !isTraceableBlock(ic, 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 block.Transactions[index].ToStackItem()
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}
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// getTransactionSigners returns transaction signers to the SC.
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func (l *Ledger) getTransactionSigners(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, h) {
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return stackitem.Null{}
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}
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return transaction.SignersToStackItem(tx.Signers)
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}
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// getTransactionVMState returns VM state got after transaction invocation.
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func (l *Ledger) getTransactionVMState(ic *interop.Context, params []stackitem.Item) stackitem.Item {
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hash, err := getUint256FromItem(params[0])
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if err != nil {
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panic(err)
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}
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h, _, aer, err := ic.DAO.GetTxExecResult(hash)
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if err != nil || !isTraceableBlock(ic, h) {
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return stackitem.Make(vmstate.None)
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}
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return stackitem.Make(aer.VMState)
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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 the index specified.
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func isTraceableBlock(ic *interop.Context, index uint32) bool {
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height := ic.BlockHeight()
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MaxTraceableBlocks := ic.Chain.GetConfig().MaxTraceableBlocks
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return index <= height && index+MaxTraceableBlocks > height
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}
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// getBlockHashFromItem converts the given stackitem.Item to a block hash using the given
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// Ledger 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(ic *interop.Context, item stackitem.Item) util.Uint256 {
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bigindex, err := item.TryInteger()
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if err == nil && bigindex.IsUint64() {
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index := bigindex.Uint64()
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if index > math.MaxUint32 {
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panic("bad block index")
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}
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if uint32(index) > ic.BlockHeight() {
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panic(fmt.Errorf("no block with index %d", index))
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}
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return ic.Chain.GetHeaderHash(uint32(index))
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}
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hash, err := getUint256FromItem(item)
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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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func getUint256FromItem(item stackitem.Item) (util.Uint256, error) {
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hashbytes, err := item.TryBytes()
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if err != nil {
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return util.Uint256{}, fmt.Errorf("failed to get hash bytes: %w", 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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return util.Uint256{}, fmt.Errorf("failed to decode hash: %w", err)
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}
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return hash, nil
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}
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// getTransactionAndHeight returns a 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(d *dao.Simple, item stackitem.Item) (*transaction.Transaction, uint32, error) {
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hash, err := getUint256FromItem(item)
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if err != nil {
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panic(err)
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}
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return d.GetTransaction(hash)
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}
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