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double_sign_monitor.go
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double_sign_monitor.go
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package relayer
import (
"bytes"
"context"
"encoding/hex"
"fmt"
"sync"
"github.com/binance-chain/bsc-double-sign-sdk/client"
"github.com/binance-chain/bsc-double-sign-sdk/types/bsc"
util "github.com/binance-chain/bsc-relayer/config"
"github.com/ethereum/go-ethereum"
ethereumtype "github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/tendermint/tendermint/libs/clist"
"github.com/binance-chain/bsc-relayer/common"
"github.com/binance-chain/bsc-relayer/executor"
)
const (
maxCacheHeader = 100
)
type DoubleSignMonitor struct {
mux sync.Mutex
ethereumHeaderNumbers []*clist.CList
ethereumHeaders []map[int64]*ethereumtype.Header
bbcExecutor *executor.BBCExecutor
}
func isDoubleSignHeaders(headers [2]*bsc.Header) bool {
if headers[0] == nil || headers[1] == nil {
return false
}
if headers[0].Number != (headers[1].Number) {
return false
}
if bytes.Equal(headers[0].ParentHash[:], headers[1].ParentHash[:]) {
return false
}
signature1, err := headers[0].GetSignature()
if err != nil {
return false
}
signature2, err := headers[1].GetSignature()
if err != nil {
return false
}
if bytes.Equal(signature1, signature2) {
return false
}
signer1, err := headers[0].ExtractSignerFromHeader()
if err != nil {
return false
}
signer2, err := headers[1].ExtractSignerFromHeader()
if err != nil {
return false
}
if !bytes.Equal(signer1.Bytes(), signer2.Bytes()) {
return false
}
return true
}
func (monitor *DoubleSignMonitor) doubleSignChecker(channelNumber int, header *ethereumtype.Header) {
monitor.mux.Lock()
defer monitor.mux.Unlock()
if header == nil {
return
}
for _, headerMap := range monitor.ethereumHeaders {
previousHeader, ok := headerMap[header.Number.Int64()]
if !ok {
continue
}
var twoHeader [2]*bsc.Header
twoHeader[0] = client.EthHeaderToBscHeader(header)
twoHeader[1] = client.EthHeaderToBscHeader(previousHeader)
ok = isDoubleSignHeaders(twoHeader)
if !ok {
continue
}
signature0, _ := twoHeader[0].GetSignature()
signature1, _ := twoHeader[1].GetSignature()
common.Logger.Infof("found double sign evidence: height %d, first signature %s, second signature %s",
header.Number.Int64(), hex.EncodeToString(signature0), hex.EncodeToString(signature1))
util.SendTelegramMessage(monitor.bbcExecutor.Config.AlertConfig.Identity, monitor.bbcExecutor.Config.AlertConfig.TelegramBotId, monitor.bbcExecutor.Config.AlertConfig.TelegramChatId,
fmt.Sprintf("Alert: found double sign evidence: height %d, first miner %s, signature %s; second miner %s, signature %s",
header.Number.Int64(), twoHeader[0].Coinbase.String(), hex.EncodeToString(signature0), twoHeader[1].Coinbase.String(), hex.EncodeToString(signature1)))
tx, err := monitor.bbcExecutor.SubmitEvidence(twoHeader[:])
if err != nil {
common.Logger.Errorf("submit evidence err: %s", err.Error())
continue
}
common.Logger.Infof("submit evidence success, tx result: %v", tx)
}
// cleanup old headers
if monitor.ethereumHeaderNumbers[channelNumber].Len() >= maxCacheHeader {
elem := monitor.ethereumHeaderNumbers[channelNumber].Front()
monitor.ethereumHeaderNumbers[channelNumber].Remove(elem)
elem.DetachPrev()
removedHeaderNumber, ok := elem.Value.(int64)
if !ok {
common.Logger.Error("found unexpect element %v", elem.Value)
}
delete(monitor.ethereumHeaders[channelNumber], removedHeaderNumber)
}
monitor.ethereumHeaderNumbers[channelNumber].PushBack(header.Number.Int64())
monitor.ethereumHeaders[channelNumber][header.Number.Int64()] = header
}
func (r *Relayer) doubleSignMonitorDaemon() {
var bscProviderList = r.cfg.BSCConfig.MonitorDataSeedList
doubleSignMonitor := DoubleSignMonitor{
ethereumHeaders: make([]map[int64]*ethereumtype.Header, len(bscProviderList)),
ethereumHeaderNumbers: make([]*clist.CList, len(bscProviderList)),
bbcExecutor: r.bbcExecutor,
}
var headerChannelList []chan *ethereumtype.Header
var subscriptionList []ethereum.Subscription
for index, provider := range bscProviderList {
headerChannel := make(chan *ethereumtype.Header, maxCacheHeader)
bscClient, err := ethclient.Dial(provider)
if err != nil {
panic(err)
}
subscription, err := bscClient.SubscribeNewHead(context.Background(), headerChannel)
if err != nil {
panic(err)
}
subscriptionList = append(subscriptionList, subscription)
headerChannelList = append(headerChannelList, headerChannel)
doubleSignMonitor.ethereumHeaderNumbers[index] = clist.New()
doubleSignMonitor.ethereumHeaders[index] = make(map[int64]*ethereumtype.Header, maxCacheHeader)
}
defer func() {
for _, subscription := range subscriptionList {
subscription.Unsubscribe()
}
}()
go func() {
for index, headerChannel := range headerChannelList {
go func(channelNumber int, channel chan *ethereumtype.Header) {
for header := range channel {
doubleSignMonitor.doubleSignChecker(channelNumber, header)
}
}(index, headerChannel)
}
}()
select {}
}