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270 lines
8.0 KiB
270 lines
8.0 KiB
package consensus
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import (
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"context"
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"fmt"
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"sync"
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"testing"
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"time"
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"github.com/stretchr/testify/require"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/p2p"
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"github.com/tendermint/tendermint/types"
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)
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//----------------------------------------------
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// byzantine failures
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// 4 validators. 1 is byzantine. The other three are partitioned into A (1 val) and B (2 vals).
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// byzantine validator sends conflicting proposals into A and B,
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// and prevotes/precommits on both of them.
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// B sees a commit, A doesn't.
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// Byzantine validator refuses to prevote.
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// Heal partition and ensure A sees the commit
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func TestByzantine(t *testing.T) {
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N := 4
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logger := consensusLogger().With("test", "byzantine")
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css, cleanup := randConsensusNet(N, "consensus_byzantine_test", newMockTickerFunc(false), newCounter)
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defer cleanup()
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// give the byzantine validator a normal ticker
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ticker := NewTimeoutTicker()
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ticker.SetLogger(css[0].Logger)
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css[0].SetTimeoutTicker(ticker)
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switches := make([]*p2p.Switch, N)
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p2pLogger := logger.With("module", "p2p")
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for i := 0; i < N; i++ {
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switches[i] = p2p.MakeSwitch(
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config.P2P,
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i,
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"foo", "1.0.0",
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func(i int, sw *p2p.Switch) *p2p.Switch {
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return sw
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})
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switches[i].SetLogger(p2pLogger.With("validator", i))
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}
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eventChans := make([]chan interface{}, N)
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reactors := make([]p2p.Reactor, N)
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for i := 0; i < N; i++ {
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// make first val byzantine
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if i == 0 {
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// NOTE: Now, test validators are MockPV, which by default doesn't
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// do any safety checks.
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css[i].privValidator.(*types.MockPV).DisableChecks()
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css[i].decideProposal = func(j int) func(int64, int) {
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return func(height int64, round int) {
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byzantineDecideProposalFunc(t, height, round, css[j], switches[j])
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}
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}(i)
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css[i].doPrevote = func(height int64, round int) {}
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}
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eventBus := css[i].eventBus
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eventBus.SetLogger(logger.With("module", "events", "validator", i))
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eventChans[i] = make(chan interface{}, 1)
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err := eventBus.Subscribe(context.Background(), testSubscriber, types.EventQueryNewBlock, eventChans[i])
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require.NoError(t, err)
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conR := NewConsensusReactor(css[i], true) // so we dont start the consensus states
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conR.SetLogger(logger.With("validator", i))
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conR.SetEventBus(eventBus)
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var conRI p2p.Reactor = conR
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// make first val byzantine
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if i == 0 {
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conRI = NewByzantineReactor(conR)
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}
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reactors[i] = conRI
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}
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defer func() {
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for _, r := range reactors {
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if rr, ok := r.(*ByzantineReactor); ok {
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rr.reactor.Switch.Stop()
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} else {
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r.(*ConsensusReactor).Switch.Stop()
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}
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}
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}()
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p2p.MakeConnectedSwitches(config.P2P, N, func(i int, s *p2p.Switch) *p2p.Switch {
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// ignore new switch s, we already made ours
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switches[i].AddReactor("CONSENSUS", reactors[i])
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return switches[i]
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}, func(sws []*p2p.Switch, i, j int) {
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// the network starts partitioned with globally active adversary
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if i != 0 {
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return
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}
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p2p.Connect2Switches(sws, i, j)
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})
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// start the non-byz state machines.
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// note these must be started before the byz
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for i := 1; i < N; i++ {
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cr := reactors[i].(*ConsensusReactor)
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cr.SwitchToConsensus(cr.conS.GetState(), 0)
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}
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// start the byzantine state machine
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byzR := reactors[0].(*ByzantineReactor)
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s := byzR.reactor.conS.GetState()
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byzR.reactor.SwitchToConsensus(s, 0)
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// byz proposer sends one block to peers[0]
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// and the other block to peers[1] and peers[2].
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// note peers and switches order don't match.
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peers := switches[0].Peers().List()
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// partition A
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ind0 := getSwitchIndex(switches, peers[0])
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// partition B
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ind1 := getSwitchIndex(switches, peers[1])
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ind2 := getSwitchIndex(switches, peers[2])
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p2p.Connect2Switches(switches, ind1, ind2)
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// wait for someone in the big partition (B) to make a block
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<-eventChans[ind2]
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t.Log("A block has been committed. Healing partition")
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p2p.Connect2Switches(switches, ind0, ind1)
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p2p.Connect2Switches(switches, ind0, ind2)
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// wait till everyone makes the first new block
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// (one of them already has)
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wg := new(sync.WaitGroup)
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wg.Add(2)
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for i := 1; i < N-1; i++ {
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go func(j int) {
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<-eventChans[j]
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wg.Done()
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}(i)
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}
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done := make(chan struct{})
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go func() {
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wg.Wait()
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close(done)
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}()
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tick := time.NewTicker(time.Second * 10)
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select {
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case <-done:
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case <-tick.C:
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for i, reactor := range reactors {
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t.Log(fmt.Sprintf("Consensus Reactor %v", i))
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t.Log(fmt.Sprintf("%v", reactor))
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}
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t.Fatalf("Timed out waiting for all validators to commit first block")
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}
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}
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//-------------------------------
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// byzantine consensus functions
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func byzantineDecideProposalFunc(t *testing.T, height int64, round int, cs *ConsensusState, sw *p2p.Switch) {
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// byzantine user should create two proposals and try to split the vote.
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// Avoid sending on internalMsgQueue and running consensus state.
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// Create a new proposal block from state/txs from the mempool.
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block1, blockParts1 := cs.createProposalBlock()
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polRound, propBlockID := cs.ValidRound, types.BlockID{block1.Hash(), blockParts1.Header()}
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proposal1 := types.NewProposal(height, round, polRound, propBlockID)
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if err := cs.privValidator.SignProposal(cs.state.ChainID, proposal1); err != nil {
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t.Error(err)
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}
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// Create a new proposal block from state/txs from the mempool.
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block2, blockParts2 := cs.createProposalBlock()
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polRound, propBlockID = cs.ValidRound, types.BlockID{block2.Hash(), blockParts2.Header()}
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proposal2 := types.NewProposal(height, round, polRound, propBlockID)
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if err := cs.privValidator.SignProposal(cs.state.ChainID, proposal2); err != nil {
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t.Error(err)
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}
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block1Hash := block1.Hash()
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block2Hash := block2.Hash()
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// broadcast conflicting proposals/block parts to peers
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peers := sw.Peers().List()
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t.Logf("Byzantine: broadcasting conflicting proposals to %d peers", len(peers))
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for i, peer := range peers {
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if i < len(peers)/2 {
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go sendProposalAndParts(height, round, cs, peer, proposal1, block1Hash, blockParts1)
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} else {
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go sendProposalAndParts(height, round, cs, peer, proposal2, block2Hash, blockParts2)
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}
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}
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}
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func sendProposalAndParts(height int64, round int, cs *ConsensusState, peer p2p.Peer, proposal *types.Proposal, blockHash []byte, parts *types.PartSet) {
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// proposal
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msg := &ProposalMessage{Proposal: proposal}
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peer.Send(DataChannel, cdc.MustMarshalBinaryBare(msg))
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// parts
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for i := 0; i < parts.Total(); i++ {
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part := parts.GetPart(i)
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msg := &BlockPartMessage{
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Height: height, // This tells peer that this part applies to us.
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Round: round, // This tells peer that this part applies to us.
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Part: part,
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}
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peer.Send(DataChannel, cdc.MustMarshalBinaryBare(msg))
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}
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// votes
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cs.mtx.Lock()
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prevote, _ := cs.signVote(types.PrevoteType, blockHash, parts.Header())
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precommit, _ := cs.signVote(types.PrecommitType, blockHash, parts.Header())
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cs.mtx.Unlock()
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peer.Send(VoteChannel, cdc.MustMarshalBinaryBare(&VoteMessage{prevote}))
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peer.Send(VoteChannel, cdc.MustMarshalBinaryBare(&VoteMessage{precommit}))
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}
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//----------------------------------------
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// byzantine consensus reactor
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type ByzantineReactor struct {
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cmn.Service
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reactor *ConsensusReactor
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}
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func NewByzantineReactor(conR *ConsensusReactor) *ByzantineReactor {
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return &ByzantineReactor{
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Service: conR,
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reactor: conR,
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}
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}
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func (br *ByzantineReactor) SetSwitch(s *p2p.Switch) { br.reactor.SetSwitch(s) }
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func (br *ByzantineReactor) GetChannels() []*p2p.ChannelDescriptor { return br.reactor.GetChannels() }
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func (br *ByzantineReactor) AddPeer(peer p2p.Peer) {
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if !br.reactor.IsRunning() {
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return
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}
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// Create peerState for peer
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peerState := NewPeerState(peer).SetLogger(br.reactor.Logger)
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peer.Set(types.PeerStateKey, peerState)
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// Send our state to peer.
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// If we're fast_syncing, broadcast a RoundStepMessage later upon SwitchToConsensus().
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if !br.reactor.fastSync {
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br.reactor.sendNewRoundStepMessage(peer)
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}
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}
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func (br *ByzantineReactor) RemovePeer(peer p2p.Peer, reason interface{}) {
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br.reactor.RemovePeer(peer, reason)
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}
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func (br *ByzantineReactor) Receive(chID byte, peer p2p.Peer, msgBytes []byte) {
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br.reactor.Receive(chID, peer, msgBytes)
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}
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