108 lines
3 KiB
Go
108 lines
3 KiB
Go
package native
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import (
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"errors"
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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/smartcontract/trigger"
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"github.com/nspcc-dev/neo-go/pkg/util"
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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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)
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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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// postPersistScript is vm script which executes "postPersist" method of every native contract.
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postPersistScript []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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// 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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// Not every contract is persisted:
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// https://github.com/neo-project/neo/blob/master/src/neo/Ledger/Blockchain.cs#L90
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if md.ContractID == policyContractID {
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continue
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}
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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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emit.Opcode(w.BinWriter, opcode.DROP)
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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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// GetPostPersistScript returns VM script calling "postPersist" method of some native contracts.
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func (cs *Contracts) GetPostPersistScript() []byte {
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if cs.postPersistScript != nil {
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return cs.postPersistScript
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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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// Not every contract is persisted:
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// https://github.com/neo-project/neo/blob/master/src/neo/Ledger/Blockchain.cs#L103
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if md.ContractID == policyContractID || md.ContractID == gasContractID {
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continue
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}
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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, "postPersist")
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emit.AppCall(w.BinWriter, md.Hash)
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emit.Opcode(w.BinWriter, opcode.DROP)
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}
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cs.postPersistScript = w.Bytes()
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return cs.postPersistScript
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}
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func postPersistBase(ic *interop.Context) error {
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if ic.Trigger != trigger.System {
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return errors.New("'postPersist' should be trigered by system")
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}
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return nil
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}
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