neo-go/pkg/services/oracle/transaction.go

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package oracle
import (
"sync"
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"time"
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"github.com/nspcc-dev/neo-go/pkg/config/netmode"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
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"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/crypto/hash"
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"github.com/nspcc-dev/neo-go/pkg/crypto/keys"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
)
type (
incompleteTx struct {
sync.RWMutex
// isSent is true if tx has been already broadcasted.
isSent bool
// attempts is how many times the request was processed.
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attempts int
// time is the time when the request was last processed.
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time time.Time
// request is an oracle request.
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request *state.OracleRequest
// tx is an oracle response transaction.
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tx *transaction.Transaction
// sigs contains a signature from every oracle node.
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sigs map[string]*txSignature
// backupTx is a backup transaction.
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backupTx *transaction.Transaction
// backupSigs contains signatures of backup tx.
backupSigs map[string]*txSignature
}
txSignature struct {
// pub is a cached public key.
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pub *keys.PublicKey
// ok is true if the signature was verified.
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ok bool
// sig is tx signature.
sig []byte
}
)
func newIncompleteTx() *incompleteTx {
return &incompleteTx{
sigs: make(map[string]*txSignature),
backupSigs: make(map[string]*txSignature),
}
}
func (t *incompleteTx) reverifyTx(net netmode.Magic) {
txHash := hash.NetSha256(uint32(net), t.tx)
backupHash := hash.NetSha256(uint32(net), t.backupTx)
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for pub, sig := range t.sigs {
if !sig.ok {
sig.ok = sig.pub.Verify(sig.sig, txHash.BytesBE())
if !sig.ok && sig.pub.Verify(sig.sig, backupHash.BytesBE()) {
t.backupSigs[pub] = &txSignature{
pub: sig.pub,
ok: true,
sig: sig.sig,
}
}
}
}
}
func (t *incompleteTx) addResponse(pub *keys.PublicKey, sig []byte, isBackup bool) {
tx, sigs := t.tx, t.sigs
if isBackup {
tx, sigs = t.backupTx, t.backupSigs
}
sigs[string(pub.Bytes())] = &txSignature{
pub: pub,
ok: tx != nil,
sig: sig,
}
}
// finalize checks if either main or backup tx has sufficient number of signatures and returns
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// tx and bool value indicating if it is ready to be broadcasted.
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func (t *incompleteTx) finalize(oracleNodes keys.PublicKeys, backupOnly bool) (*transaction.Transaction, bool) {
if !backupOnly && finalizeTx(oracleNodes, t.tx, t.sigs) {
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return t.tx, true
}
return t.backupTx, finalizeTx(oracleNodes, t.backupTx, t.backupSigs)
}
func finalizeTx(oracleNodes keys.PublicKeys, tx *transaction.Transaction, txSigs map[string]*txSignature) bool {
if tx == nil {
return false
}
m := smartcontract.GetDefaultHonestNodeCount(len(oracleNodes))
sigs := make([][]byte, 0, m)
for _, pub := range oracleNodes {
sig, ok := txSigs[string(pub.Bytes())]
if ok && sig.ok {
sigs = append(sigs, sig.sig)
if len(sigs) == m {
break
}
}
}
if len(sigs) != m {
return false
}
w := io.NewBufBinWriter()
for i := range sigs {
emit.Bytes(w.BinWriter, sigs[i])
}
tx.Scripts[1].InvocationScript = w.Bytes()
return true
}