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reorg.go
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reorg.go
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package main
import (
"compress/gzip"
"fmt"
"math/rand"
"os"
"time"
"github.com/kaspanet/kaspad/domain/consensus/model"
"github.com/kaspanet/kaspad/domain/consensus"
"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
"github.com/kaspanet/kaspad/domain/consensus/model/testapi"
"github.com/kaspanet/kaspad/domain/consensus/utils/consensushashing"
"github.com/kaspanet/kaspad/domain/dagconfig"
)
func testReorg(cfg *configFlags) {
consensusConfig := consensus.Config{Params: dagconfig.DevnetParams}
consensusConfig.SkipProofOfWork = true
consensusConfig.DisableDifficultyAdjustment = true
factory := consensus.NewFactory()
tc, teardown, err := factory.NewTestConsensus(&consensusConfig, "ReorgHonest")
if err != nil {
panic(err)
}
defer teardown(false)
f, err := os.Open(cfg.DAGFile)
if err != nil {
panic(err)
}
defer f.Close()
gzipReader, err := gzip.NewReader(f)
if err != nil {
panic(err)
}
defer gzipReader.Close()
_, err = tc.MineJSON(gzipReader, testapi.MineJSONBlockTypeUTXOValidBlock)
if err != nil {
panic(err)
}
tcAttacker, teardownAttacker, err := factory.NewTestConsensus(&consensusConfig, "ReorgAttacker")
if err != nil {
panic(err)
}
defer teardownAttacker(false)
virtualSelectedParent, err := tc.GetVirtualSelectedParent()
if err != nil {
panic(err)
}
stagingArea := model.NewStagingArea()
virtualSelectedParentGHOSTDAGData, err := tc.GHOSTDAGDataStore().Get(tc.DatabaseContext(), stagingArea, virtualSelectedParent, false)
if err != nil {
panic(err)
}
log.Infof("Selected tip blue score %d", virtualSelectedParentGHOSTDAGData.BlueScore())
sideChain := make([]*externalapi.DomainBlock, 0)
for i := uint64(0); ; i++ {
tips, err := tcAttacker.Tips()
if err != nil {
panic(err)
}
block, _, err := tcAttacker.BuildBlockWithParents(tips, nil, nil)
if err != nil {
panic(err)
}
// We change the nonce of the first block so its hash won't be similar to any of the
// honest DAG blocks. As a result the rest of the side chain should have unique hashes
// as well.
if i == 0 {
mutableHeader := block.Header.ToMutable()
mutableHeader.SetNonce(uint64(rand.NewSource(84147).Int63()))
block.Header = mutableHeader.ToImmutable()
}
_, err = tcAttacker.ValidateAndInsertBlock(block, true)
if err != nil {
panic(err)
}
sideChain = append(sideChain, block)
if i%100 == 0 {
log.Infof("Attacker side chain mined %d blocks", i)
}
blockHash := consensushashing.BlockHash(block)
ghostdagData, err := tcAttacker.GHOSTDAGDataStore().Get(tcAttacker.DatabaseContext(), stagingArea, blockHash, false)
if err != nil {
panic(err)
}
if virtualSelectedParentGHOSTDAGData.BlueWork().Cmp(ghostdagData.BlueWork()) == -1 {
break
}
}
sideChainTipHash := consensushashing.BlockHash(sideChain[len(sideChain)-1])
sideChainTipGHOSTDAGData, err := tcAttacker.GHOSTDAGDataStore().Get(tcAttacker.DatabaseContext(), stagingArea, sideChainTipHash, false)
if err != nil {
panic(err)
}
log.Infof("Side chain tip (%s) blue score %d", sideChainTipHash, sideChainTipGHOSTDAGData.BlueScore())
doneChan := make(chan struct{})
spawn("add-sidechain-to-honest", func() {
for i, block := range sideChain {
if i%100 == 0 {
log.Infof("Validated %d blocks from the attacker chain", i)
}
_, err := tc.ValidateAndInsertBlock(block, true)
if err != nil {
panic(err)
}
}
doneChan <- struct{}{}
})
const timeout = 12 * time.Hour
select {
case <-doneChan:
case <-time.After(timeout):
fail("Adding the side chain took more than %s", timeout)
}
sideChainTipGHOSTDAGData, err = tc.GHOSTDAGDataStore().Get(tc.DatabaseContext(), stagingArea, sideChainTipHash, false)
if err != nil {
panic(err)
}
log.Infof("Side chain tip (%s) blue score %d", sideChainTipHash, sideChainTipGHOSTDAGData.BlueScore())
newVirtualSelectedParent, err := tc.GetVirtualSelectedParent()
if err != nil {
panic(err)
}
if !newVirtualSelectedParent.Equal(sideChainTipHash) {
fail("No reorg happened")
}
}
func fail(format string, args ...interface{}) {
msg := fmt.Sprintf(format, args...)
fmt.Fprintln(os.Stderr, msg)
log.Criticalf(msg)
backendLog.Close()
os.Exit(1)
}