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package consensus
import (
"testing"
"github.com/tendermint/tendermint/libs/bytes"
"github.com/tendermint/tendermint/libs/log"
tmrand "github.com/tendermint/tendermint/libs/rand"
"github.com/tendermint/tendermint/p2p"
tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
"github.com/tendermint/tendermint/types"
)
//----------------------------------------------
// byzantine failures
// one byz val sends a precommit for a random block at each height
// Ensure a testnet makes blocks
func TestReactorInvalidPrecommit(t *testing.T) {
N := 4
css, cleanup := randConsensusNet(N, "consensus_reactor_test", newMockTickerFunc(true), newCounter)
defer cleanup()
for i := 0; i < 4; i++ {
ticker := NewTimeoutTicker()
ticker.SetLogger(css[i].Logger)
css[i].SetTimeoutTicker(ticker)
}
reactors, blocksSubs, eventBuses := startConsensusNet(t, css, N)
// this val sends a random precommit at each height
byzValIdx := 0
byzVal := css[byzValIdx]
byzR := reactors[byzValIdx]
// update the doPrevote function to just send a valid precommit for a random block
// and otherwise disable the priv validator
byzVal.mtx.Lock()
pv := byzVal.privValidator
byzVal.doPrevote = func(height int64, round int32) {
invalidDoPrevoteFunc(t, height, round, byzVal, byzR.Switch, pv)
}
byzVal.mtx.Unlock()
defer stopConsensusNet(log.TestingLogger(), reactors, eventBuses)
// wait for a bunch of blocks
// TODO: make this tighter by ensuring the halt happens by block 2
for i := 0; i < 10; i++ {
timeoutWaitGroup(t, N, func(j int) {
<-blocksSubs[j].Out()
}, css)
}
}
func invalidDoPrevoteFunc(t *testing.T, height int64, round int32, cs *State, sw *p2p.Switch, pv types.PrivValidator) {
// routine to:
// - precommit for a random block
// - send precommit to all peers
// - disable privValidator (so we don't do normal precommits)
go func() {
cs.mtx.Lock()
cs.privValidator = pv
pubKey, err := cs.privValidator.GetPubKey()
if err != nil {
panic(err)
}
addr := pubKey.Address()
valIndex, _ := cs.Validators.GetByAddress(addr)
// precommit a random block
blockHash := bytes.HexBytes(tmrand.Bytes(32))
precommit := &types.Vote{
ValidatorAddress: addr,
ValidatorIndex: valIndex,
Height: cs.Height,
Round: cs.Round,
Timestamp: cs.voteTime(),
Type: tmproto.PrecommitType,
BlockID: types.BlockID{
Hash: blockHash,
PartSetHeader: types.PartSetHeader{Total: 1, Hash: tmrand.Bytes(32)}},
}
p := precommit.ToProto()
cs.privValidator.SignVote(cs.state.ChainID, p)
precommit.Signature = p.Signature
cs.privValidator = nil // disable priv val so we don't do normal votes
cs.mtx.Unlock()
peers := sw.Peers().List()
for _, peer := range peers {
cs.Logger.Info("Sending bad vote", "block", blockHash, "peer", peer)
peer.Send(VoteChannel, MustEncode(&VoteMessage{precommit}))
}
}()
}