33c971b0e4
Make the contracts cache initialization unified. The order of cache iniitialization is not important and Nottary contract is added to the bc.contracts.Contracts wrt P2PSigExtensions setting, thus no functional changes, just refactoring for future applications. Signed-off-by: Anna Shaleva <shaleva.ann@nspcc.ru>
260 lines
8.9 KiB
Go
260 lines
8.9 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/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 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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// SignersToStackItem converts transaction.Signers to stackitem.Item.
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func SignersToStackItem(signers []transaction.Signer) stackitem.Item {
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res := make([]stackitem.Item, len(signers))
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for i, s := range signers {
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contracts := make([]stackitem.Item, len(s.AllowedContracts))
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for j, c := range s.AllowedContracts {
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contracts[j] = stackitem.NewByteArray(c.BytesBE())
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}
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groups := make([]stackitem.Item, len(s.AllowedGroups))
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for j, g := range s.AllowedGroups {
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groups[j] = stackitem.NewByteArray(g.Bytes())
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}
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rules := make([]stackitem.Item, len(s.Rules))
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for j, r := range s.Rules {
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rules[j] = r.ToStackItem()
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}
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res[i] = stackitem.NewArray([]stackitem.Item{
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stackitem.NewByteArray(s.Account.BytesBE()),
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stackitem.NewBigInteger(big.NewInt(int64(s.Scopes))),
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stackitem.NewArray(contracts),
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stackitem.NewArray(groups),
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stackitem.NewArray(rules),
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})
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}
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return stackitem.NewArray(res)
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}
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