neoneo-go/pkg/core/interop/runtime/util.go

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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()),
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
}