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