mirror of
https://github.com/nspcc-dev/neo-go.git
synced 2024-11-27 03:58:06 +00:00
bf01599430
When calling external contracts we expect exactly 1 value to be on stack. For methods returning nothing, `Null` value is pushed, otherwise it is an error.`
68 lines
1.7 KiB
Go
68 lines
1.7 KiB
Go
package native
|
|
|
|
import (
|
|
"github.com/nspcc-dev/neo-go/pkg/core/interop"
|
|
"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"
|
|
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
|
|
)
|
|
|
|
// Contracts is a set of registered native contracts.
|
|
type Contracts struct {
|
|
NEO *NEO
|
|
GAS *GAS
|
|
Policy *Policy
|
|
Contracts []interop.Contract
|
|
// persistScript is vm script which executes "onPersist" method of every native contract.
|
|
persistScript []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
|
|
}
|
|
|
|
// NewContracts returns new set of native contracts with new GAS, NEO and Policy
|
|
// contracts.
|
|
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)
|
|
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()
|
|
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
|
|
}
|