120 lines
3.5 KiB
Go
120 lines
3.5 KiB
Go
package runtime
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import (
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"errors"
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"fmt"
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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/vm/stackitem"
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"go.uber.org/zap"
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)
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const (
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// MaxEventNameLen is the maximum length of a name for event.
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MaxEventNameLen = 32
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// MaxNotificationSize is the maximum length of a runtime log message.
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MaxNotificationSize = 1024
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)
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// GetExecutingScriptHash returns executing script hash.
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func GetExecutingScriptHash(ic *interop.Context) error {
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return ic.VM.PushContextScriptHash(0)
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}
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// GetCallingScriptHash returns calling script hash.
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// While Executing and Entry script hashes are always valid for non-native contracts,
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// Calling hash is set explicitly when native contracts are used, because when switching from
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// one native to another, no operations are performed on invocation stack.
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func GetCallingScriptHash(ic *interop.Context) error {
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h := ic.VM.GetCallingScriptHash()
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ic.VM.Estack().PushVal(h.BytesBE())
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return nil
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}
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// GetEntryScriptHash returns entry script hash.
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func GetEntryScriptHash(ic *interop.Context) error {
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return ic.VM.PushContextScriptHash(ic.VM.Istack().Len() - 1)
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}
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// Platform returns the name of the platform.
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func Platform(ic *interop.Context) error {
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ic.VM.Estack().PushVal([]byte("NEO"))
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return nil
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}
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// GetTrigger returns the script trigger.
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func GetTrigger(ic *interop.Context) error {
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ic.VM.Estack().PushVal(byte(ic.Trigger))
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return nil
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}
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// Notify should pass stack item to the notify plugin to handle it, but
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// in neo-go the only meaningful thing to do here is to log.
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func Notify(ic *interop.Context) error {
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name := ic.VM.Estack().Pop().String()
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elem := ic.VM.Estack().Pop()
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args := elem.Array()
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if len(name) > MaxEventNameLen {
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return fmt.Errorf("event name must be less than %d", MaxEventNameLen)
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}
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// But it has to be serializable, otherwise we either have some broken
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// (recursive) structure inside or an interop item that can't be used
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// outside of the interop subsystem anyway.
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bytes, err := stackitem.SerializeItem(elem.Item())
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if err != nil {
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return fmt.Errorf("bad notification: %w", err)
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}
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if len(bytes) > MaxNotificationSize {
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return fmt.Errorf("notification size shouldn't exceed %d", MaxNotificationSize)
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}
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ne := state.NotificationEvent{
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ScriptHash: ic.VM.GetCurrentScriptHash(),
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Name: name,
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Item: stackitem.DeepCopy(stackitem.NewArray(args)).(*stackitem.Array),
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}
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ic.Notifications = append(ic.Notifications, ne)
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return nil
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}
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// Log logs the message passed.
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func Log(ic *interop.Context) error {
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state := ic.VM.Estack().Pop().String()
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if len(state) > MaxNotificationSize {
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return fmt.Errorf("message length shouldn't exceed %v", MaxNotificationSize)
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}
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var txHash string
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if ic.Tx != nil {
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txHash = ic.Tx.Hash().StringLE()
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}
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ic.Log.Info("runtime log",
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zap.String("tx", txHash),
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zap.String("script", ic.VM.GetCurrentScriptHash().StringLE()),
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zap.String("msg", state))
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return nil
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}
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// GetTime returns timestamp of the block being verified, or the latest
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// one in the blockchain if no block is given to Context.
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func GetTime(ic *interop.Context) error {
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ic.VM.Estack().PushVal(ic.Block.Timestamp)
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return nil
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}
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// BurnGas burns GAS to benefit NEO ecosystem.
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func BurnGas(ic *interop.Context) error {
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gas := ic.VM.Estack().Pop().BigInt()
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if !gas.IsInt64() {
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return errors.New("invalid GAS value")
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}
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g := gas.Int64()
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if g <= 0 {
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return errors.New("GAS must be positive")
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}
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if !ic.VM.AddGas(g) {
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return errors.New("GAS limit exceeded")
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}
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return nil
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}
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