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

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package native
import (
"errors"
"fmt"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/vm"
)
// Deploy deploys native contract.
func Deploy(ic *interop.Context, _ *vm.VM) error {
if ic.Block == nil || ic.Block.Index != 0 {
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return errors.New("native contracts can be deployed only at 0 block")
}
for _, native := range ic.Natives {
md := native.Metadata()
cs := &state.Contract{
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ID: md.ContractID,
Script: md.Script,
Manifest: md.Manifest,
}
if err := ic.DAO.PutContractState(cs); err != nil {
return err
}
if err := native.Initialize(ic); err != nil {
return fmt.Errorf("initializing %s native contract: %v", md.Name, err)
}
}
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return nil
}
// Call calls specified native contract method.
func Call(ic *interop.Context, v *vm.VM) error {
name := string(v.Estack().Pop().Bytes())
var c interop.Contract
for _, ctr := range ic.Natives {
if ctr.Metadata().Name == name {
c = ctr
break
}
}
if c == nil {
return fmt.Errorf("native contract %s not found", name)
}
h := v.GetCurrentScriptHash()
if !h.Equals(c.Metadata().Hash) {
return errors.New("it is not allowed to use Neo.Native.Call directly to call native contracts. System.Contract.Call should be used")
}
operation := string(v.Estack().Pop().Bytes())
args := v.Estack().Pop().Array()
m, ok := c.Metadata().Methods[operation]
if !ok {
return fmt.Errorf("method %s not found", operation)
}
if !v.Context().GetCallFlags().Has(m.RequiredFlags) {
return errors.New("missing call flags")
}
if !v.AddGas(m.Price) {
return errors.New("gas limit exceeded")
}
result := m.Func(ic, args)
v.Estack().PushVal(result)
return nil
}