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

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package native
import (
"errors"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
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"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
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)
// Contracts is a set of registered native contracts.
type Contracts struct {
NEO *NEO
GAS *GAS
Policy *Policy
Oracle *Oracle
Contracts []interop.Contract
// persistScript is vm script which executes "onPersist" method of every native contract.
persistScript []byte
// postPersistScript is vm script which executes "postPersist" method of every native contract.
postPersistScript []byte
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}
// ByHash returns native contract with the specified hash.
func (cs *Contracts) ByHash(h util.Uint160) interop.Contract {
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for _, ctr := range cs.Contracts {
if ctr.Metadata().Hash.Equals(h) {
return ctr
}
}
return nil
}
// NewContracts returns new set of native contracts with new GAS, NEO and Policy
// contracts.
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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)
oracle := newOracle()
oracle.GAS = gas
oracle.NEO = neo
cs.Oracle = oracle
cs.Contracts = append(cs.Contracts, oracle)
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()
// Not every contract is persisted:
// https://github.com/neo-project/neo/blob/master/src/neo/Ledger/Blockchain.cs#L90
if md.ContractID == policyContractID || md.ContractID == oracleContractID {
continue
}
emit.Int(w.BinWriter, 0)
emit.Opcode(w.BinWriter, opcode.NEWARRAY)
emit.String(w.BinWriter, "onPersist")
emit.AppCall(w.BinWriter, md.Hash)
emit.Opcode(w.BinWriter, opcode.DROP)
}
cs.persistScript = w.Bytes()
return cs.persistScript
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}
// GetPostPersistScript returns VM script calling "postPersist" method of some native contracts.
func (cs *Contracts) GetPostPersistScript() []byte {
if cs.postPersistScript != nil {
return cs.postPersistScript
}
w := io.NewBufBinWriter()
for i := range cs.Contracts {
md := cs.Contracts[i].Metadata()
// Not every contract is persisted:
// https://github.com/neo-project/neo/blob/master/src/neo/Ledger/Blockchain.cs#L103
if md.ContractID == policyContractID || md.ContractID == gasContractID {
continue
}
emit.Int(w.BinWriter, 0)
emit.Opcode(w.BinWriter, opcode.NEWARRAY)
emit.String(w.BinWriter, "postPersist")
emit.AppCall(w.BinWriter, md.Hash)
emit.Opcode(w.BinWriter, opcode.DROP)
}
cs.postPersistScript = w.Bytes()
return cs.postPersistScript
}
func postPersistBase(ic *interop.Context) error {
if ic.Trigger != trigger.System {
return errors.New("'postPersist' should be trigered by system")
}
return nil
}