package native import ( "strings" "github.com/nspcc-dev/neo-go/pkg/core/interop" "github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames" "github.com/nspcc-dev/neo-go/pkg/io" "github.com/nspcc-dev/neo-go/pkg/util" "github.com/nspcc-dev/neo-go/pkg/vm/emit" ) // reservedContractID represents the upper bound of the reserved IDs for native contracts. const reservedContractID = -100 // Contracts is a set of registered native contracts. type Contracts struct { Management *Management Ledger *Ledger NEO *NEO GAS *GAS Policy *Policy Oracle *Oracle Designate *Designate NameService *NameService Notary *Notary 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 } // 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 } // ByName returns native contract with the specified name. func (cs *Contracts) ByName(name string) interop.Contract { name = strings.ToLower(name) for _, ctr := range cs.Contracts { if strings.ToLower(ctr.Metadata().Name) == name { return ctr } } return nil } // NewContracts returns new set of native contracts with new GAS, NEO, Policy, Oracle, // Designate and (optional) Notary contracts. func NewContracts(p2pSigExtensionsEnabled bool) *Contracts { cs := new(Contracts) mgmt := newManagement() cs.Management = mgmt cs.Contracts = append(cs.Contracts, mgmt) ledger := newLedger() cs.Ledger = ledger cs.Contracts = append(cs.Contracts, ledger) gas := newGAS() neo := newNEO() neo.GAS = gas gas.NEO = neo mgmt.NEO = neo cs.GAS = gas cs.NEO = neo cs.Contracts = append(cs.Contracts, neo) cs.Contracts = append(cs.Contracts, gas) policy := newPolicy() policy.NEO = neo cs.Policy = policy cs.Contracts = append(cs.Contracts, policy) desig := newDesignate(p2pSigExtensionsEnabled) desig.NEO = neo cs.Designate = desig cs.Contracts = append(cs.Contracts, desig) oracle := newOracle() oracle.GAS = gas oracle.NEO = neo oracle.Desig = desig cs.Oracle = oracle cs.Contracts = append(cs.Contracts, oracle) ns := newNameService() ns.NEO = neo cs.NameService = ns cs.Contracts = append(cs.Contracts, ns) if p2pSigExtensionsEnabled { notary := newNotary() notary.GAS = gas notary.NEO = neo notary.Desig = desig cs.Notary = notary cs.Contracts = append(cs.Contracts, notary) } return cs } // GetPersistScript returns VM script calling "onPersist" syscall for native contracts. func (cs *Contracts) GetPersistScript() []byte { if cs.persistScript != nil { return cs.persistScript } w := io.NewBufBinWriter() emit.Syscall(w.BinWriter, interopnames.SystemContractNativeOnPersist) cs.persistScript = w.Bytes() return cs.persistScript } // GetPostPersistScript returns VM script calling "postPersist" syscall for native contracts. func (cs *Contracts) GetPostPersistScript() []byte { if cs.postPersistScript != nil { return cs.postPersistScript } w := io.NewBufBinWriter() emit.Syscall(w.BinWriter, interopnames.SystemContractNativePostPersist) cs.postPersistScript = w.Bytes() return cs.postPersistScript }