neo-go/pkg/core/native/interop.go

105 lines
2.9 KiB
Go

package native
import (
"errors"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/config"
"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/callflag"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
// Call calls the 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 meta *interop.ContractMD
curr := ic.VM.GetCurrentScriptHash()
for _, ctr := range ic.Natives {
m := ctr.Metadata()
if m.Hash == curr {
meta = m
break
}
}
if meta == nil {
return fmt.Errorf("native contract %s (version %d) not found", curr.StringLE(), version)
}
history := meta.UpdateHistory
if len(history) == 0 {
return fmt.Errorf("native contract %s is disabled", meta.Name)
}
if history[0] > ic.BlockHeight() {
return fmt.Errorf("native contract %s is active after height = %d", meta.Name, history[0])
}
m, ok := meta.GetMethodByOffset(ic.VM.Context().IP())
if !ok {
return fmt.Errorf("method not found")
}
reqFlags := m.RequiredFlags
if !ic.IsHardforkEnabled(config.HFAspidochelone) && meta.ID == ManagementContractID &&
(m.MD.Name == "deploy" || m.MD.Name == "update") {
reqFlags &= callflag.States | callflag.AllowNotify
}
if !ic.VM.Context().GetCallFlags().Has(reqFlags) {
return fmt.Errorf("missing call flags for native %d `%s` operation call: %05b vs %05b",
version, m.MD.Name, ic.VM.Context().GetCallFlags(), reqFlags)
}
invokeFee := m.CPUFee*ic.BaseExecFee() +
m.StorageFee*ic.BaseStorageFee()
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().Peek(i).Item()
}
result := m.Func(ic, args)
for range m.MD.Parameters {
ic.VM.Estack().Pop()
}
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
}