mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-12-12 11:10:35 +00:00
121 lines
3.6 KiB
Go
121 lines
3.6 KiB
Go
package runtime
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"math/big"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/core/interop"
|
|
"github.com/nspcc-dev/neo-go/pkg/core/state"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
|
|
"go.uber.org/zap"
|
|
)
|
|
|
|
const (
|
|
// MaxEventNameLen is the maximum length of a name for event.
|
|
MaxEventNameLen = 32
|
|
// MaxNotificationSize is the maximum length of a runtime log message.
|
|
MaxNotificationSize = 1024
|
|
)
|
|
|
|
// GetExecutingScriptHash returns executing script hash.
|
|
func GetExecutingScriptHash(ic *interop.Context) error {
|
|
return ic.VM.PushContextScriptHash(0)
|
|
}
|
|
|
|
// GetCallingScriptHash returns calling script hash.
|
|
// While Executing and Entry script hashes are always valid for non-native contracts,
|
|
// Calling hash is set explicitly when native contracts are used, because when switching from
|
|
// one native to another, no operations are performed on invocation stack.
|
|
func GetCallingScriptHash(ic *interop.Context) error {
|
|
h := ic.VM.GetCallingScriptHash()
|
|
ic.VM.Estack().PushItem(stackitem.NewByteArray(h.BytesBE()))
|
|
return nil
|
|
}
|
|
|
|
// GetEntryScriptHash returns entry script hash.
|
|
func GetEntryScriptHash(ic *interop.Context) error {
|
|
return ic.VM.PushContextScriptHash(ic.VM.Istack().Len() - 1)
|
|
}
|
|
|
|
// Platform returns the name of the platform.
|
|
func Platform(ic *interop.Context) error {
|
|
ic.VM.Estack().PushItem(stackitem.NewByteArray([]byte("NEO")))
|
|
return nil
|
|
}
|
|
|
|
// GetTrigger returns the script trigger.
|
|
func GetTrigger(ic *interop.Context) error {
|
|
ic.VM.Estack().PushItem(stackitem.NewBigInteger(big.NewInt(int64(ic.Trigger))))
|
|
return nil
|
|
}
|
|
|
|
// Notify should pass stack item to the notify plugin to handle it, but
|
|
// in neo-go the only meaningful thing to do here is to log.
|
|
func Notify(ic *interop.Context) error {
|
|
name := ic.VM.Estack().Pop().String()
|
|
elem := ic.VM.Estack().Pop()
|
|
args := elem.Array()
|
|
if len(name) > MaxEventNameLen {
|
|
return fmt.Errorf("event name must be less than %d", MaxEventNameLen)
|
|
}
|
|
// But it has to be serializable, otherwise we either have some broken
|
|
// (recursive) structure inside or an interop item that can't be used
|
|
// outside of the interop subsystem anyway.
|
|
bytes, err := stackitem.Serialize(elem.Item())
|
|
if err != nil {
|
|
return fmt.Errorf("bad notification: %w", err)
|
|
}
|
|
if len(bytes) > MaxNotificationSize {
|
|
return fmt.Errorf("notification size shouldn't exceed %d", MaxNotificationSize)
|
|
}
|
|
ne := state.NotificationEvent{
|
|
ScriptHash: ic.VM.GetCurrentScriptHash(),
|
|
Name: name,
|
|
Item: stackitem.DeepCopy(stackitem.NewArray(args)).(*stackitem.Array),
|
|
}
|
|
ic.Notifications = append(ic.Notifications, ne)
|
|
return nil
|
|
}
|
|
|
|
// Log logs the message passed.
|
|
func Log(ic *interop.Context) error {
|
|
state := ic.VM.Estack().Pop().String()
|
|
if len(state) > MaxNotificationSize {
|
|
return fmt.Errorf("message length shouldn't exceed %v", MaxNotificationSize)
|
|
}
|
|
var txHash string
|
|
if ic.Tx != nil {
|
|
txHash = ic.Tx.Hash().StringLE()
|
|
}
|
|
ic.Log.Info("runtime log",
|
|
zap.String("tx", txHash),
|
|
zap.String("script", ic.VM.GetCurrentScriptHash().StringLE()),
|
|
zap.String("msg", state))
|
|
return nil
|
|
}
|
|
|
|
// GetTime returns timestamp of the block being verified, or the latest
|
|
// one in the blockchain if no block is given to Context.
|
|
func GetTime(ic *interop.Context) error {
|
|
ic.VM.Estack().PushItem(stackitem.NewBigInteger(new(big.Int).SetUint64(ic.Block.Timestamp)))
|
|
return nil
|
|
}
|
|
|
|
// BurnGas burns GAS to benefit NEO ecosystem.
|
|
func BurnGas(ic *interop.Context) error {
|
|
gas := ic.VM.Estack().Pop().BigInt()
|
|
if !gas.IsInt64() {
|
|
return errors.New("invalid GAS value")
|
|
}
|
|
|
|
g := gas.Int64()
|
|
if g <= 0 {
|
|
return errors.New("GAS must be positive")
|
|
}
|
|
|
|
if !ic.VM.AddGas(g) {
|
|
return errors.New("GAS limit exceeded")
|
|
}
|
|
return nil
|
|
}
|