mirror of
https://github.com/nspcc-dev/neo-go.git
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0fa4c49735
After native contracts are deployed, single persist script is created and executed at the start of every block persisting.
107 lines
2.7 KiB
Go
107 lines
2.7 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/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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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 and NEO
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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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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.AppCallWithOperationAndArgs(w.BinWriter, md.Hash, "onPersist")
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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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Price: 0, // TODO price func
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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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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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