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heavy_check.go
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heavy_check.go
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package heavycheck
import (
"errors"
"runtime"
"sync"
"github.com/TechPay-io/sirius-base/eventcheck/epochcheck"
"github.com/TechPay-io/sirius-base/eventcheck/queuedcheck"
"github.com/TechPay-io/sirius-base/hash"
"github.com/TechPay-io/sirius-base/inter/dag"
"github.com/TechPay-io/sirius-base/inter/idx"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/trie"
"github.com/TechPay-io/go-photon/inter"
"github.com/TechPay-io/go-photon/inter/validatorpk"
)
var (
ErrWrongEventSig = errors.New("event has wrong signature")
ErrMalformedTxSig = errors.New("tx has wrong signature")
ErrWrongTxHash = errors.New("tx has wrong txs Merkle tree root")
errTerminated = errors.New("terminated") // internal err
)
// Reader is accessed by the validator to get the current state.
type Reader interface {
GetEpochPubKeys() (map[idx.ValidatorID]validatorpk.PubKey, idx.Epoch)
}
// Checker which requires only parents list + current epoch info
type Checker struct {
config Config
txSigner types.Signer
reader Reader
tasksQ chan *TasksData
quit chan struct{}
wg sync.WaitGroup
}
type TasksData struct {
Tasks []queuedcheck.EventTask // events to validate
onValidated func([]queuedcheck.EventTask)
}
// New validator which performs heavy checks, related to signatures validation and Merkle tree validation
func New(config Config, reader Reader, txSigner types.Signer) *Checker {
if config.Threads == 0 {
config.Threads = runtime.NumCPU()
if config.Threads > 1 {
config.Threads--
}
if config.Threads < 1 {
config.Threads = 1
}
}
return &Checker{
config: config,
txSigner: txSigner,
reader: reader,
tasksQ: make(chan *TasksData, config.MaxQueuedBatches),
quit: make(chan struct{}),
}
}
func (v *Checker) Start() {
for i := 0; i < v.config.Threads; i++ {
v.wg.Add(1)
go v.loop()
}
}
func (v *Checker) Stop() {
close(v.quit)
v.wg.Wait()
}
func (v *Checker) Overloaded() bool {
return len(v.tasksQ) > v.config.MaxQueuedBatches/2
}
func (v *Checker) Enqueue(tasks []queuedcheck.EventTask, onValidated func([]queuedcheck.EventTask)) error {
// divide big batch into smaller ones
for start := 0; start < len(tasks); start += v.config.MaxBatch {
end := len(tasks)
if end > start+v.config.MaxBatch {
end = start + v.config.MaxBatch
}
op := &TasksData{
Tasks: tasks[start:end],
onValidated: onValidated,
}
select {
case v.tasksQ <- op:
continue
case <-v.quit:
return errTerminated
}
}
return nil
}
// verifySignature checks the signature against e.Creator.
func verifySignature(e inter.EventPayloadI, pubkey validatorpk.PubKey) bool {
if pubkey.Type != validatorpk.Types.Secp256k1 {
return false
}
signedHash := e.HashToSign().Bytes()
sig := e.Sig()
return crypto.VerifySignature(pubkey.Raw, signedHash, sig.Bytes())
}
// Validate event
func (v *Checker) Validate(de dag.Event) error {
e := de.(inter.EventPayloadI)
addrs, epoch := v.reader.GetEpochPubKeys()
if e.Epoch() != epoch {
return epochcheck.ErrNotRelevant
}
// validatorID
addr, ok := addrs[e.Creator()]
if !ok {
return epochcheck.ErrAuth
}
// event sig
if !verifySignature(e, addr) {
return ErrWrongEventSig
}
// pre-cache tx sig
for _, tx := range e.Txs() {
_, err := types.Sender(v.txSigner, tx)
if err != nil {
return ErrMalformedTxSig
}
}
// Merkle tree
if e.TxHash() != hash.Hash(types.DeriveSha(e.Txs(), new(trie.Trie))) {
return ErrWrongTxHash
}
return nil
}
func (v *Checker) loop() {
defer v.wg.Done()
for {
select {
case op := <-v.tasksQ:
for _, t := range op.Tasks {
t.SetResult(v.Validate(t.Event()))
}
op.onValidated(op.Tasks)
case <-v.quit:
return
}
}
}