215 lines
6.8 KiB
Go
215 lines
6.8 KiB
Go
package core
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import (
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"bytes"
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"encoding/base64"
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"errors"
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"fmt"
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"sort"
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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/state"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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const (
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// MaxContractDescriptionLen is the maximum length for contract description.
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MaxContractDescriptionLen = 65536
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// MaxContractScriptSize is the maximum script size for a contract.
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MaxContractScriptSize = 1024 * 1024
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// MaxContractParametersNum is the maximum number of parameters for a contract.
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MaxContractParametersNum = 252
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// MaxContractStringLen is the maximum length for contract metadata strings.
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MaxContractStringLen = 252
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)
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var errGasLimitExceeded = errors.New("gas limit exceeded")
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// storageFind finds stored key-value pair.
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func storageFind(ic *interop.Context) error {
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stcInterface := ic.VM.Estack().Pop().Value()
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stc, ok := stcInterface.(*StorageContext)
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if !ok {
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return fmt.Errorf("%T is not a StorageContext", stcInterface)
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}
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prefix := ic.VM.Estack().Pop().Bytes()
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siMap, err := ic.DAO.GetStorageItemsWithPrefix(stc.ID, prefix)
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if err != nil {
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return err
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}
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filteredMap := stackitem.NewMap()
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for k, v := range siMap {
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filteredMap.Add(stackitem.NewByteArray(append(prefix, []byte(k)...)), stackitem.NewByteArray(v.Value))
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}
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sort.Slice(filteredMap.Value().([]stackitem.MapElement), func(i, j int) bool {
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return bytes.Compare(filteredMap.Value().([]stackitem.MapElement)[i].Key.Value().([]byte),
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filteredMap.Value().([]stackitem.MapElement)[j].Key.Value().([]byte)) == -1
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})
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item := vm.NewMapIterator(filteredMap)
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ic.VM.Estack().PushVal(item)
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return nil
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}
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// createContractStateFromVM pops all contract state elements from the VM
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// evaluation stack, does a lot of checks and returns Contract if it
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// succeeds.
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func createContractStateFromVM(ic *interop.Context) (*state.Contract, error) {
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script := ic.VM.Estack().Pop().Bytes()
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if len(script) > MaxContractScriptSize {
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return nil, errors.New("the script is too big")
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}
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manifestBytes := ic.VM.Estack().Pop().Bytes()
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if len(manifestBytes) > manifest.MaxManifestSize {
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return nil, errors.New("manifest is too big")
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}
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if !ic.VM.AddGas(int64(StoragePrice * (len(script) + len(manifestBytes)))) {
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return nil, errGasLimitExceeded
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}
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var m manifest.Manifest
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err := m.UnmarshalJSON(manifestBytes)
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if err != nil {
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return nil, fmt.Errorf("unable to retrieve manifest from stack: %w", err)
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}
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return &state.Contract{
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Script: script,
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Manifest: m,
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}, nil
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}
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// contractCreate creates a contract.
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func contractCreate(ic *interop.Context) error {
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newcontract, err := createContractStateFromVM(ic)
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if err != nil {
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return err
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}
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contract, err := ic.DAO.GetContractState(newcontract.ScriptHash())
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if contract != nil {
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return errors.New("contract already exists")
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}
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id, err := ic.DAO.GetAndUpdateNextContractID()
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if err != nil {
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return err
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}
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newcontract.ID = id
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if !newcontract.Manifest.IsValid(newcontract.ScriptHash()) {
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return errors.New("failed to check contract script hash against manifest")
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}
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if err := ic.DAO.PutContractState(newcontract); err != nil {
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return err
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}
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cs, err := contractToStackItem(newcontract)
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if err != nil {
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return fmt.Errorf("cannot convert contract to stack item: %w", err)
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}
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ic.VM.Estack().PushVal(cs)
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return nil
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}
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// contractUpdate migrates a contract. This method assumes that Manifest and Script
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// of the contract can be updated independently.
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func contractUpdate(ic *interop.Context) error {
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contract, _ := ic.DAO.GetContractState(ic.VM.GetCurrentScriptHash())
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if contract == nil {
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return errors.New("contract doesn't exist")
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}
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script := ic.VM.Estack().Pop().Bytes()
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if len(script) > MaxContractScriptSize {
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return errors.New("the script is too big")
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}
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manifestBytes := ic.VM.Estack().Pop().Bytes()
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if len(manifestBytes) > manifest.MaxManifestSize {
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return errors.New("manifest is too big")
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}
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if !ic.VM.AddGas(int64(StoragePrice * (len(script) + len(manifestBytes)))) {
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return errGasLimitExceeded
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}
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// if script was provided, update the old contract script and Manifest.ABI hash
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if l := len(script); l > 0 {
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if l > MaxContractScriptSize {
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return errors.New("invalid script len")
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}
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newHash := hash.Hash160(script)
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if newHash.Equals(contract.ScriptHash()) {
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return errors.New("the script is the same")
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} else if _, err := ic.DAO.GetContractState(newHash); err == nil {
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return errors.New("contract already exists")
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}
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oldHash := contract.ScriptHash()
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// re-write existing contract variable, as we need it to be up-to-date during manifest update
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contract = &state.Contract{
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ID: contract.ID,
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Script: script,
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Manifest: contract.Manifest,
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}
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contract.Manifest.ABI.Hash = newHash
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if err := ic.DAO.PutContractState(contract); err != nil {
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return fmt.Errorf("failed to update script: %w", err)
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}
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if err := ic.DAO.DeleteContractState(oldHash); err != nil {
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return fmt.Errorf("failed to update script: %w", err)
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}
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}
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// if manifest was provided, update the old contract manifest and check associated
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// storage items if needed
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if len(manifestBytes) > 0 {
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var newManifest manifest.Manifest
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err := newManifest.UnmarshalJSON(manifestBytes)
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if err != nil {
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return fmt.Errorf("unable to retrieve manifest from stack: %w", err)
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}
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// we don't have to perform `GetContractState` one more time as it's already up-to-date
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contract.Manifest = newManifest
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if !contract.Manifest.IsValid(contract.ScriptHash()) {
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return errors.New("failed to check contract script hash against new manifest")
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}
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if !contract.HasStorage() {
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siMap, err := ic.DAO.GetStorageItems(contract.ID)
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if err != nil {
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return fmt.Errorf("failed to update manifest: %w", err)
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}
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if len(siMap) != 0 {
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return errors.New("old contract shouldn't have storage")
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}
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}
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if err := ic.DAO.PutContractState(contract); err != nil {
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return fmt.Errorf("failed to update manifest: %w", err)
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}
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}
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return nil
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}
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// runtimeSerialize serializes top stack item into a ByteArray.
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func runtimeSerialize(ic *interop.Context) error {
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return vm.RuntimeSerialize(ic.VM)
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}
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// runtimeDeserialize deserializes ByteArray from a stack into an item.
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func runtimeDeserialize(ic *interop.Context) error {
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return vm.RuntimeDeserialize(ic.VM)
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}
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// runtimeEncode encodes top stack item into a base64 string.
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func runtimeEncode(ic *interop.Context) error {
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src := ic.VM.Estack().Pop().Bytes()
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result := base64.StdEncoding.EncodeToString(src)
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ic.VM.Estack().PushVal([]byte(result))
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return nil
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}
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// runtimeDecode decodes top stack item from base64 string to byte array.
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func runtimeDecode(ic *interop.Context) error {
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src := ic.VM.Estack().Pop().String()
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result, err := base64.StdEncoding.DecodeString(src)
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if err != nil {
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return err
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}
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ic.VM.Estack().PushVal(result)
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return nil
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}
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