9d2ef775cf
They never return errors, so their interface should reflect that. This allows to remove quite a lot of useless and never tested code. Notice that Get still does return an error. It can be made not to do that, but usually we need to differentiate between successful/unsuccessful accesses anyway, so this doesn't help much.
243 lines
7.5 KiB
Go
243 lines
7.5 KiB
Go
package core
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import (
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"context"
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"crypto/elliptic"
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"errors"
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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/interop"
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istorage "github.com/nspcc-dev/neo-go/pkg/core/interop/storage"
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"github.com/nspcc-dev/neo-go/pkg/core/native"
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"github.com/nspcc-dev/neo-go/pkg/core/storage"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
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"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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var (
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errGasLimitExceeded = errors.New("gas limit exceeded")
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errFindInvalidOptions = errors.New("invalid Find options")
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)
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// StorageContext contains storing id and read/write flag, it's used as
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// a context for storage manipulation functions.
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type StorageContext struct {
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ID int32
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ReadOnly bool
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}
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// engineGetScriptContainer returns transaction or block that contains the script
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// being run.
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func engineGetScriptContainer(ic *interop.Context) error {
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var item stackitem.Item
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switch t := ic.Container.(type) {
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case *transaction.Transaction:
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item = native.TransactionToStackItem(t)
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case *block.Block:
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item = native.BlockToStackItem(t)
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default:
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return errors.New("unknown script container")
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}
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ic.VM.Estack().PushItem(item)
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return nil
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}
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// storageDelete deletes stored key-value pair.
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func storageDelete(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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if stc.ReadOnly {
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return errors.New("StorageContext is read only")
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}
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key := ic.VM.Estack().Pop().Bytes()
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ic.DAO.DeleteStorageItem(stc.ID, key)
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return nil
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}
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// storageGet returns stored key-value pair.
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func storageGet(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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key := ic.VM.Estack().Pop().Bytes()
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si := ic.DAO.GetStorageItem(stc.ID, key)
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if si != nil {
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ic.VM.Estack().PushItem(stackitem.NewByteArray([]byte(si)))
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} else {
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ic.VM.Estack().PushItem(stackitem.Null{})
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}
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return nil
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}
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// storageGetContext returns storage context (scripthash).
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func storageGetContext(ic *interop.Context) error {
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return storageGetContextInternal(ic, false)
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}
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// storageGetReadOnlyContext returns read-only context (scripthash).
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func storageGetReadOnlyContext(ic *interop.Context) error {
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return storageGetContextInternal(ic, true)
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}
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// storageGetContextInternal is internal version of storageGetContext and
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// storageGetReadOnlyContext which allows to specify ReadOnly context flag.
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func storageGetContextInternal(ic *interop.Context, isReadOnly bool) error {
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contract, err := ic.GetContract(ic.VM.GetCurrentScriptHash())
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if err != nil {
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return err
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}
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sc := &StorageContext{
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ID: contract.ID,
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ReadOnly: isReadOnly,
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}
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ic.VM.Estack().PushItem(stackitem.NewInterop(sc))
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return nil
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}
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func putWithContext(ic *interop.Context, stc *StorageContext, key []byte, value []byte) error {
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if len(key) > storage.MaxStorageKeyLen {
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return errors.New("key is too big")
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}
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if len(value) > storage.MaxStorageValueLen {
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return errors.New("value is too big")
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}
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if stc.ReadOnly {
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return errors.New("StorageContext is read only")
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}
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si := ic.DAO.GetStorageItem(stc.ID, key)
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sizeInc := len(value)
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if si == nil {
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sizeInc = len(key) + len(value)
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} else if len(value) != 0 {
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if len(value) <= len(si) {
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sizeInc = (len(value)-1)/4 + 1
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} else if len(si) != 0 {
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sizeInc = (len(si)-1)/4 + 1 + len(value) - len(si)
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}
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}
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if !ic.VM.AddGas(int64(sizeInc) * ic.Chain.GetStoragePrice()) {
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return errGasLimitExceeded
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}
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ic.DAO.PutStorageItem(stc.ID, key, value)
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return nil
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}
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// storagePut puts key-value pair into the storage.
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func storagePut(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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key := ic.VM.Estack().Pop().Bytes()
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value := ic.VM.Estack().Pop().Bytes()
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return putWithContext(ic, stc, key, value)
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}
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// storageContextAsReadOnly sets given context to read-only mode.
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func storageContextAsReadOnly(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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if !stc.ReadOnly {
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stx := &StorageContext{
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ID: stc.ID,
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ReadOnly: true,
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}
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stc = stx
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}
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ic.VM.Estack().PushItem(stackitem.NewInterop(stc))
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return nil
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}
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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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opts := ic.VM.Estack().Pop().BigInt().Int64()
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if opts&^istorage.FindAll != 0 {
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return fmt.Errorf("%w: unknown flag", errFindInvalidOptions)
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}
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if opts&istorage.FindKeysOnly != 0 &&
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opts&(istorage.FindDeserialize|istorage.FindPick0|istorage.FindPick1) != 0 {
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return fmt.Errorf("%w KeysOnly conflicts with other options", errFindInvalidOptions)
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}
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if opts&istorage.FindValuesOnly != 0 &&
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opts&(istorage.FindKeysOnly|istorage.FindRemovePrefix) != 0 {
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return fmt.Errorf("%w: KeysOnly conflicts with ValuesOnly", errFindInvalidOptions)
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}
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if opts&istorage.FindPick0 != 0 && opts&istorage.FindPick1 != 0 {
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return fmt.Errorf("%w: Pick0 conflicts with Pick1", errFindInvalidOptions)
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}
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if opts&istorage.FindDeserialize == 0 && (opts&istorage.FindPick0 != 0 || opts&istorage.FindPick1 != 0) {
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return fmt.Errorf("%w: PickN is specified without Deserialize", errFindInvalidOptions)
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}
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// Items in seekres should be sorted by key, but GetStorageItemsWithPrefix returns
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// sorted items, so no need to sort them one more time.
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ctx, cancel := context.WithCancel(context.Background())
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seekres := ic.DAO.SeekAsync(ctx, stc.ID, storage.SeekRange{Prefix: prefix})
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item := istorage.NewIterator(seekres, prefix, opts)
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ic.VM.Estack().PushItem(stackitem.NewInterop(item))
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ic.RegisterCancelFunc(cancel)
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return nil
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}
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// contractCreateMultisigAccount calculates multisig contract scripthash for a
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// given m and a set of public keys.
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func contractCreateMultisigAccount(ic *interop.Context) error {
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m := ic.VM.Estack().Pop().BigInt()
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mu64 := m.Uint64()
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if !m.IsUint64() || mu64 > math.MaxInt32 {
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return errors.New("m must be positive and fit int32")
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}
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arr := ic.VM.Estack().Pop().Array()
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pubs := make(keys.PublicKeys, len(arr))
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for i, pk := range arr {
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p, err := keys.NewPublicKeyFromBytes(pk.Value().([]byte), elliptic.P256())
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if err != nil {
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return err
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}
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pubs[i] = p
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}
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script, err := smartcontract.CreateMultiSigRedeemScript(int(mu64), pubs)
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if err != nil {
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return err
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}
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ic.VM.Estack().PushItem(stackitem.NewByteArray(hash.Hash160(script).BytesBE()))
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return nil
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}
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// contractCreateStandardAccount calculates contract scripthash for a given public key.
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func contractCreateStandardAccount(ic *interop.Context) error {
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h := ic.VM.Estack().Pop().Bytes()
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p, err := keys.NewPublicKeyFromBytes(h, elliptic.P256())
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if err != nil {
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return err
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}
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ic.VM.Estack().PushItem(stackitem.NewByteArray(p.GetScriptHash().BytesBE()))
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return nil
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}
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// contractGetCallFlags returns current context calling flags.
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func contractGetCallFlags(ic *interop.Context) error {
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ic.VM.Estack().PushItem(stackitem.NewBigInteger(big.NewInt(int64(ic.VM.Context().GetCallFlags()))))
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return nil
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}
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