mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-23 13:38:35 +00:00
118 lines
3 KiB
Go
118 lines
3 KiB
Go
package native
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/nspcc-dev/neo-go/pkg/core/interop"
|
|
"github.com/nspcc-dev/neo-go/pkg/io"
|
|
"github.com/nspcc-dev/neo-go/pkg/util"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
// Contracts is a set of registered native contracts.
|
|
type Contracts struct {
|
|
NEO *NEO
|
|
GAS *GAS
|
|
Policy *Policy
|
|
Contracts []interop.Contract
|
|
// persistScript is vm script which executes "onPersist" method of every native contract.
|
|
persistScript []byte
|
|
}
|
|
|
|
// ByHash returns native contract with the specified hash.
|
|
func (cs *Contracts) ByHash(h util.Uint160) interop.Contract {
|
|
for _, ctr := range cs.Contracts {
|
|
if ctr.Metadata().Hash.Equals(h) {
|
|
return ctr
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// ByID returns native contract with the specified id.
|
|
func (cs *Contracts) ByID(id uint32) interop.Contract {
|
|
for _, ctr := range cs.Contracts {
|
|
if ctr.Metadata().ServiceID == id {
|
|
return ctr
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// NewContracts returns new set of native contracts with new GAS, NEO and Policy
|
|
// contracts.
|
|
func NewContracts() *Contracts {
|
|
cs := new(Contracts)
|
|
|
|
gas := NewGAS()
|
|
neo := NewNEO()
|
|
neo.GAS = gas
|
|
gas.NEO = neo
|
|
|
|
cs.GAS = gas
|
|
cs.Contracts = append(cs.Contracts, gas)
|
|
cs.NEO = neo
|
|
cs.Contracts = append(cs.Contracts, neo)
|
|
|
|
policy := newPolicy()
|
|
cs.Policy = policy
|
|
cs.Contracts = append(cs.Contracts, policy)
|
|
return cs
|
|
}
|
|
|
|
// GetPersistScript returns VM script calling "onPersist" method of every native contract.
|
|
func (cs *Contracts) GetPersistScript() []byte {
|
|
if cs.persistScript != nil {
|
|
return cs.persistScript
|
|
}
|
|
w := io.NewBufBinWriter()
|
|
for i := range cs.Contracts {
|
|
md := cs.Contracts[i].Metadata()
|
|
emit.Int(w.BinWriter, 0)
|
|
emit.Opcode(w.BinWriter, opcode.NEWARRAY)
|
|
emit.String(w.BinWriter, "onPersist")
|
|
emit.AppCall(w.BinWriter, md.Hash)
|
|
}
|
|
cs.persistScript = w.Bytes()
|
|
return cs.persistScript
|
|
}
|
|
|
|
// GetNativeInterop returns an interop getter for a given set of contracts.
|
|
func (cs *Contracts) GetNativeInterop(ic *interop.Context) func(uint32) *vm.InteropFuncPrice {
|
|
return func(id uint32) *vm.InteropFuncPrice {
|
|
if c := cs.ByID(id); c != nil {
|
|
return &vm.InteropFuncPrice{
|
|
Func: getNativeInterop(ic, c),
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// getNativeInterop returns native contract interop.
|
|
func getNativeInterop(ic *interop.Context, c interop.Contract) func(v *vm.VM) error {
|
|
return func(v *vm.VM) error {
|
|
h := v.GetCurrentScriptHash()
|
|
if !h.Equals(c.Metadata().Hash) {
|
|
return errors.New("invalid hash")
|
|
}
|
|
name := string(v.Estack().Pop().Bytes())
|
|
args := v.Estack().Pop().Array()
|
|
m, ok := c.Metadata().Methods[name]
|
|
if !ok {
|
|
return fmt.Errorf("method %s not found", name)
|
|
}
|
|
if !v.Context().GetCallFlags().Has(m.RequiredFlags) {
|
|
return errors.New("missing call flags")
|
|
}
|
|
if !v.AddGas(util.Fixed8(m.Price)) {
|
|
return errors.New("gas limit exceeded")
|
|
}
|
|
result := m.Func(ic, args)
|
|
v.Estack().PushVal(result)
|
|
return nil
|
|
}
|
|
}
|