package runtime import ( "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/util" "github.com/nspcc-dev/neo-go/pkg/vm" "github.com/nspcc-dev/neo-go/pkg/vm/stackitem" "github.com/pkg/errors" ) // GasLeft returns remaining amount of GAS. func GasLeft(_ *interop.Context, v *vm.VM) error { v.Estack().PushVal(v.GasLimit - v.GasConsumed()) return nil } // GetNotifications returns notifications emitted by current contract execution. func GetNotifications(ic *interop.Context, v *vm.VM) error { item := v.Estack().Pop().Item() notifications := ic.Notifications if _, ok := item.(stackitem.Null); !ok { b, err := item.TryBytes() if err != nil { return err } u, err := util.Uint160DecodeBytesBE(b) if err != nil { return err } notifications = []state.NotificationEvent{} for i := range ic.Notifications { if ic.Notifications[i].ScriptHash.Equals(u) { notifications = append(notifications, ic.Notifications[i]) } } } if len(notifications) > vm.MaxStackSize { return errors.New("too many notifications") } arr := stackitem.NewArray(make([]stackitem.Item, 0, len(notifications))) for i := range notifications { ev := stackitem.NewArray([]stackitem.Item{ stackitem.NewByteArray(notifications[i].ScriptHash.BytesBE()), stackitem.Make(notifications[i].Name), notifications[i].Item, }) arr.Append(ev) } v.Estack().PushVal(arr) return nil } // GetInvocationCounter returns how many times current contract was invoked during current tx execution. func GetInvocationCounter(ic *interop.Context, v *vm.VM) error { count, ok := ic.Invocations[v.GetCurrentScriptHash()] if !ok { return errors.New("current contract wasn't invoked from others") } v.Estack().PushVal(count) return nil }