neoneo-go/pkg/services/stateroot/validators.go

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package stateroot
import (
"time"
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"github.com/nspcc-dev/neo-go/pkg/core/state"
"github.com/nspcc-dev/neo-go/pkg/core/transaction"
"github.com/nspcc-dev/neo-go/pkg/io"
"github.com/nspcc-dev/neo-go/pkg/network/payload"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
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"github.com/nspcc-dev/neo-go/pkg/wallet"
"go.uber.org/zap"
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)
const (
voteValidEndInc = 10
firstVoteResendDelay = 3 * time.Second
)
// Start runs service instance in a separate goroutine.
func (s *service) Start() {
s.log.Info("starting state validation service")
s.chain.SubscribeForBlocks(s.blockCh)
go s.run()
}
func (s *service) run() {
runloop:
for {
select {
case b := <-s.blockCh:
r, err := s.GetStateRoot(b.Index)
if err != nil {
s.log.Error("can't get state root for new block", zap.Error(err))
} else if err := s.signAndSend(r); err != nil {
s.log.Error("can't sign or send state root", zap.Error(err))
}
s.srMtx.Lock()
delete(s.incompleteRoots, b.Index-voteValidEndInc)
s.srMtx.Unlock()
case <-s.done:
break runloop
}
}
drainloop:
for {
select {
case <-s.blockCh:
default:
break drainloop
}
}
}
// Shutdown stops the service.
func (s *service) Shutdown() {
s.chain.UnsubscribeFromBlocks(s.blockCh)
close(s.done)
}
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func (s *service) signAndSend(r *state.MPTRoot) error {
if !s.MainCfg.Enabled {
return nil
}
myIndex, acc := s.getAccount()
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if acc == nil {
return nil
}
sig := acc.PrivateKey().SignHashable(uint32(s.Network), r)
incRoot := s.getIncompleteRoot(r.Index, myIndex)
incRoot.Lock()
defer incRoot.Unlock()
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incRoot.root = r
incRoot.addSignature(acc.PrivateKey().PublicKey(), sig)
incRoot.reverify(s.Network)
s.trySendRoot(incRoot, acc)
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msg := NewMessage(VoteT, &Vote{
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ValidatorIndex: int32(myIndex),
Height: r.Index,
Signature: sig,
})
w := io.NewBufBinWriter()
msg.EncodeBinary(w.BinWriter)
if w.Err != nil {
return w.Err
}
e := &payload.Extensible{
Category: Category,
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ValidBlockStart: r.Index,
ValidBlockEnd: r.Index + voteValidEndInc,
Sender: acc.PrivateKey().GetScriptHash(),
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Data: w.Bytes(),
Witness: transaction.Witness{
VerificationScript: acc.GetVerificationScript(),
},
}
sig = acc.PrivateKey().SignHashable(uint32(s.Network), e)
buf := io.NewBufBinWriter()
emit.Bytes(buf.BinWriter, sig)
e.Witness.InvocationScript = buf.Bytes()
incRoot.myVote = e
incRoot.retries = -1
s.sendVote(incRoot)
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return nil
}
// sendVote attempts to send vote if it's still valid and if stateroot message
// was not sent yet. It must be called with ir locked.
func (s *service) sendVote(ir *incompleteRoot) {
if ir.isSent || ir.retries >= s.maxRetries ||
s.chain.HeaderHeight() >= ir.myVote.ValidBlockEnd {
return
}
s.relayExtensible(ir.myVote)
delay := firstVoteResendDelay
if ir.retries > 0 {
delay = s.timePerBlock << ir.retries
}
_ = time.AfterFunc(delay, func() {
ir.Lock()
s.sendVote(ir)
ir.Unlock()
})
ir.retries++
}
// getAccount returns current index and account for the node running this service.
func (s *service) getAccount() (byte, *wallet.Account) {
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s.accMtx.RLock()
defer s.accMtx.RUnlock()
return s.myIndex, s.acc
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}