package native import ( "errors" "fmt" "github.com/nspcc-dev/neo-go/pkg/core/interop" "github.com/nspcc-dev/neo-go/pkg/smartcontract" "github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger" "github.com/nspcc-dev/neo-go/pkg/vm/stackitem" ) // Call calls specified native contract method. func Call(ic *interop.Context) error { version := ic.VM.Estack().Pop().BigInt().Int64() if version != 0 { return fmt.Errorf("native contract of version %d is not active", version) } var c interop.Contract for _, ctr := range ic.Natives { if ctr.Metadata().Hash == ic.VM.GetCurrentScriptHash() { c = ctr break } } if c == nil { return fmt.Errorf("native contract %d not found", version) } history := c.Metadata().UpdateHistory if len(history) == 0 { return fmt.Errorf("native contract %s is disabled", c.Metadata().Name) } if history[0] > ic.Chain.BlockHeight() { return fmt.Errorf("native contract %s is active after height = %d", c.Metadata().Name, history[0]) } m, ok := c.Metadata().GetMethodByOffset(ic.VM.Context().IP()) if !ok { return fmt.Errorf("method not found") } if !ic.VM.Context().GetCallFlags().Has(m.RequiredFlags) { return fmt.Errorf("missing call flags for native %d `%s` operation call: %05b vs %05b", version, m.MD.Name, ic.VM.Context().GetCallFlags(), m.RequiredFlags) } invokeFee := m.CPUFee*ic.Chain.GetBaseExecFee() + m.StorageFee*ic.Chain.GetStoragePrice() if !ic.VM.AddGas(invokeFee) { return errors.New("gas limit exceeded") } ctx := ic.VM.Context() args := make([]stackitem.Item, len(m.MD.Parameters)) for i := range args { args[i] = ic.VM.Estack().Pop().Item() } result := m.Func(ic, args) if m.MD.ReturnType != smartcontract.VoidType { ctx.Estack().PushItem(result) } return nil } // OnPersist calls OnPersist methods for all native contracts. func OnPersist(ic *interop.Context) error { if ic.Trigger != trigger.OnPersist { return errors.New("onPersist must be trigered by system") } for _, c := range ic.Natives { if !c.Metadata().IsActive(ic.Block.Index) { continue } err := c.OnPersist(ic) if err != nil { return err } } return nil } // PostPersist calls PostPersist methods for all native contracts. func PostPersist(ic *interop.Context) error { if ic.Trigger != trigger.PostPersist { return errors.New("postPersist must be trigered by system") } for _, c := range ic.Natives { if !c.Metadata().IsActive(ic.Block.Index) { continue } err := c.PostPersist(ic) if err != nil { return err } } return nil }