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584 lines
21 KiB
584 lines
21 KiB
package consensus
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import (
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"context"
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"fmt"
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"os"
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"runtime"
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"runtime/pprof"
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"sync"
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"testing"
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"time"
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"github.com/tendermint/tendermint/abci/example/kvstore"
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cmn "github.com/tendermint/tendermint/libs/common"
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"github.com/tendermint/tendermint/libs/log"
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sm "github.com/tendermint/tendermint/state"
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cfg "github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/p2p"
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p2pdummy "github.com/tendermint/tendermint/p2p/dummy"
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"github.com/tendermint/tendermint/types"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func init() {
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config = ResetConfig("consensus_reactor_test")
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}
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//----------------------------------------------
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// in-process testnets
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func startConsensusNet(t *testing.T, css []*ConsensusState, N int) ([]*ConsensusReactor, []chan interface{}, []*types.EventBus) {
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reactors := make([]*ConsensusReactor, N)
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eventChans := make([]chan interface{}, N)
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eventBuses := make([]*types.EventBus, N)
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for i := 0; i < N; i++ {
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/*logger, err := tmflags.ParseLogLevel("consensus:info,*:error", logger, "info")
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if err != nil { t.Fatal(err)}*/
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reactors[i] = NewConsensusReactor(css[i], true) // so we dont start the consensus states
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reactors[i].SetLogger(css[i].Logger)
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// eventBus is already started with the cs
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eventBuses[i] = css[i].eventBus
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reactors[i].SetEventBus(eventBuses[i])
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eventChans[i] = make(chan interface{}, 1)
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err := eventBuses[i].Subscribe(context.Background(), testSubscriber, types.EventQueryNewBlock, eventChans[i])
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require.NoError(t, err)
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}
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// make connected switches and start all reactors
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p2p.MakeConnectedSwitches(config.P2P, N, func(i int, s *p2p.Switch) *p2p.Switch {
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s.AddReactor("CONSENSUS", reactors[i])
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s.SetLogger(reactors[i].conS.Logger.With("module", "p2p"))
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return s
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}, p2p.Connect2Switches)
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// now that everyone is connected, start the state machines
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// If we started the state machines before everyone was connected,
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// we'd block when the cs fires NewBlockEvent and the peers are trying to start their reactors
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// TODO: is this still true with new pubsub?
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for i := 0; i < N; i++ {
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s := reactors[i].conS.GetState()
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reactors[i].SwitchToConsensus(s, 0)
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}
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return reactors, eventChans, eventBuses
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}
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func stopConsensusNet(logger log.Logger, reactors []*ConsensusReactor, eventBuses []*types.EventBus) {
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logger.Info("stopConsensusNet", "n", len(reactors))
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for i, r := range reactors {
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logger.Info("stopConsensusNet: Stopping ConsensusReactor", "i", i)
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r.Switch.Stop()
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}
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for i, b := range eventBuses {
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logger.Info("stopConsensusNet: Stopping eventBus", "i", i)
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b.Stop()
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}
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logger.Info("stopConsensusNet: DONE", "n", len(reactors))
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}
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// Ensure a testnet makes blocks
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func TestReactorBasic(t *testing.T) {
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N := 4
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css := randConsensusNet(N, "consensus_reactor_test", newMockTickerFunc(true), newCounter)
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reactors, eventChans, eventBuses := startConsensusNet(t, css, N)
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defer stopConsensusNet(log.TestingLogger(), reactors, eventBuses)
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// wait till everyone makes the first new block
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timeoutWaitGroup(t, N, func(j int) {
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<-eventChans[j]
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}, css)
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}
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// Ensure we can process blocks with evidence
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func TestReactorWithEvidence(t *testing.T) {
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N := 4
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css := randConsensusNet(N, "consensus_reactor_test", newMockTickerFunc(true), newCounter)
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evpool := mockEvidencePool{
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t: t,
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ev: []types.Evidence{types.NewMockGoodEvidence(1, 1, []byte("somone"))},
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}
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for i := 0; i < N; i++ {
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css[i].evpool = evpool
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}
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reactors, eventChans, eventBuses := startConsensusNet(t, css, N)
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defer stopConsensusNet(log.TestingLogger(), reactors, eventBuses)
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// wait till everyone makes the first new block
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timeoutWaitGroup(t, N, func(j int) {
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<-eventChans[j]
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}, css)
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// second block should have evidence
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timeoutWaitGroup(t, N, func(j int) {
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<-eventChans[j]
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}, css)
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}
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type mockEvidencePool struct {
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height int
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ev []types.Evidence
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t *testing.T
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}
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func (m mockEvidencePool) PendingEvidence() []types.Evidence {
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if m.height > 0 {
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return m.ev
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}
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return nil
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}
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func (m mockEvidencePool) AddEvidence(types.Evidence) error { return nil }
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func (m mockEvidencePool) Update(block *types.Block, state sm.State) {
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m.height += 1
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if m.height > 0 {
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require.True(m.t, len(block.Evidence.Evidence) > 0)
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}
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}
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// Ensure a testnet sends proposal heartbeats and makes blocks when there are txs
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func TestReactorProposalHeartbeats(t *testing.T) {
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N := 4
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css := randConsensusNet(N, "consensus_reactor_test", newMockTickerFunc(true), newCounter,
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func(c *cfg.Config) {
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c.Consensus.CreateEmptyBlocks = false
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})
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reactors, eventChans, eventBuses := startConsensusNet(t, css, N)
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defer stopConsensusNet(log.TestingLogger(), reactors, eventBuses)
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heartbeatChans := make([]chan interface{}, N)
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var err error
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for i := 0; i < N; i++ {
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heartbeatChans[i] = make(chan interface{}, 1)
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err = eventBuses[i].Subscribe(context.Background(), testSubscriber, types.EventQueryProposalHeartbeat, heartbeatChans[i])
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require.NoError(t, err)
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}
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// wait till everyone sends a proposal heartbeat
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timeoutWaitGroup(t, N, func(j int) {
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<-heartbeatChans[j]
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}, css)
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// send a tx
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if err := css[3].mempool.CheckTx([]byte{1, 2, 3}, nil); err != nil {
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//t.Fatal(err)
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}
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// wait till everyone makes the first new block
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timeoutWaitGroup(t, N, func(j int) {
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<-eventChans[j]
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}, css)
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}
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// Test we record block parts from other peers
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func TestReactorRecordsBlockParts(t *testing.T) {
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// create dummy peer
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peer := p2pdummy.NewPeer()
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ps := NewPeerState(peer).SetLogger(log.TestingLogger())
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peer.Set(types.PeerStateKey, ps)
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// create reactor
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css := randConsensusNet(1, "consensus_reactor_records_block_parts_test", newMockTickerFunc(true), newPersistentKVStore)
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reactor := NewConsensusReactor(css[0], false) // so we dont start the consensus states
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reactor.SetEventBus(css[0].eventBus)
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reactor.SetLogger(log.TestingLogger())
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sw := p2p.MakeSwitch(cfg.DefaultP2PConfig(), 1, "testing", "123.123.123", func(i int, sw *p2p.Switch) *p2p.Switch { return sw })
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reactor.SetSwitch(sw)
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err := reactor.Start()
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require.NoError(t, err)
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defer reactor.Stop()
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// 1) new block part
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parts := types.NewPartSetFromData(cmn.RandBytes(100), 10)
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msg := &BlockPartMessage{
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Height: 2,
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Round: 0,
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Part: parts.GetPart(0),
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}
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bz, err := cdc.MarshalBinaryBare(msg)
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require.NoError(t, err)
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reactor.Receive(DataChannel, peer, bz)
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require.Equal(t, 1, ps.BlockPartsSent(), "number of block parts sent should have increased by 1")
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// 2) block part with the same height, but different round
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msg.Round = 1
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bz, err = cdc.MarshalBinaryBare(msg)
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require.NoError(t, err)
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reactor.Receive(DataChannel, peer, bz)
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require.Equal(t, 1, ps.BlockPartsSent(), "number of block parts sent should stay the same")
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// 3) block part from earlier height
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msg.Height = 1
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msg.Round = 0
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bz, err = cdc.MarshalBinaryBare(msg)
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require.NoError(t, err)
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reactor.Receive(DataChannel, peer, bz)
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require.Equal(t, 1, ps.BlockPartsSent(), "number of block parts sent should stay the same")
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}
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// Test we record votes from other peers
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func TestReactorRecordsVotes(t *testing.T) {
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// create dummy peer
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peer := p2pdummy.NewPeer()
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ps := NewPeerState(peer).SetLogger(log.TestingLogger())
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peer.Set(types.PeerStateKey, ps)
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// create reactor
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css := randConsensusNet(1, "consensus_reactor_records_votes_test", newMockTickerFunc(true), newPersistentKVStore)
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reactor := NewConsensusReactor(css[0], false) // so we dont start the consensus states
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reactor.SetEventBus(css[0].eventBus)
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reactor.SetLogger(log.TestingLogger())
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sw := p2p.MakeSwitch(cfg.DefaultP2PConfig(), 1, "testing", "123.123.123", func(i int, sw *p2p.Switch) *p2p.Switch { return sw })
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reactor.SetSwitch(sw)
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err := reactor.Start()
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require.NoError(t, err)
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defer reactor.Stop()
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_, val := css[0].state.Validators.GetByIndex(0)
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// 1) new vote
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vote := &types.Vote{
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ValidatorIndex: 0,
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ValidatorAddress: val.Address,
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Height: 2,
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Round: 0,
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Timestamp: time.Now().UTC(),
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Type: types.VoteTypePrevote,
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BlockID: types.BlockID{},
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}
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bz, err := cdc.MarshalBinaryBare(&VoteMessage{vote})
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require.NoError(t, err)
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reactor.Receive(VoteChannel, peer, bz)
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assert.Equal(t, 1, ps.VotesSent(), "number of votes sent should have increased by 1")
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// 2) vote with the same height, but different round
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vote.Round = 1
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bz, err = cdc.MarshalBinaryBare(&VoteMessage{vote})
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require.NoError(t, err)
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reactor.Receive(VoteChannel, peer, bz)
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assert.Equal(t, 1, ps.VotesSent(), "number of votes sent should stay the same")
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// 3) vote from earlier height
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vote.Height = 1
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vote.Round = 0
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bz, err = cdc.MarshalBinaryBare(&VoteMessage{vote})
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require.NoError(t, err)
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reactor.Receive(VoteChannel, peer, bz)
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assert.Equal(t, 1, ps.VotesSent(), "number of votes sent should stay the same")
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}
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//-------------------------------------------------------------
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// ensure we can make blocks despite cycling a validator set
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func TestReactorVotingPowerChange(t *testing.T) {
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nVals := 4
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logger := log.TestingLogger()
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css := randConsensusNet(nVals, "consensus_voting_power_changes_test", newMockTickerFunc(true), newPersistentKVStore)
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reactors, eventChans, eventBuses := startConsensusNet(t, css, nVals)
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defer stopConsensusNet(logger, reactors, eventBuses)
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// map of active validators
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activeVals := make(map[string]struct{})
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for i := 0; i < nVals; i++ {
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activeVals[string(css[i].privValidator.GetAddress())] = struct{}{}
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}
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// wait till everyone makes block 1
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timeoutWaitGroup(t, nVals, func(j int) {
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<-eventChans[j]
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}, css)
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//---------------------------------------------------------------------------
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logger.Debug("---------------------------- Testing changing the voting power of one validator a few times")
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val1PubKey := css[0].privValidator.GetPubKey()
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val1PubKeyABCI := types.TM2PB.PubKey(val1PubKey)
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updateValidatorTx := kvstore.MakeValSetChangeTx(val1PubKeyABCI, 25)
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previousTotalVotingPower := css[0].GetRoundState().LastValidators.TotalVotingPower()
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css, updateValidatorTx)
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waitForAndValidateBlockWithTx(t, nVals, activeVals, eventChans, css, updateValidatorTx)
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css)
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css)
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if css[0].GetRoundState().LastValidators.TotalVotingPower() == previousTotalVotingPower {
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t.Fatalf("expected voting power to change (before: %d, after: %d)", previousTotalVotingPower, css[0].GetRoundState().LastValidators.TotalVotingPower())
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}
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updateValidatorTx = kvstore.MakeValSetChangeTx(val1PubKeyABCI, 2)
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previousTotalVotingPower = css[0].GetRoundState().LastValidators.TotalVotingPower()
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css, updateValidatorTx)
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waitForAndValidateBlockWithTx(t, nVals, activeVals, eventChans, css, updateValidatorTx)
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css)
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css)
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if css[0].GetRoundState().LastValidators.TotalVotingPower() == previousTotalVotingPower {
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t.Fatalf("expected voting power to change (before: %d, after: %d)", previousTotalVotingPower, css[0].GetRoundState().LastValidators.TotalVotingPower())
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}
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updateValidatorTx = kvstore.MakeValSetChangeTx(val1PubKeyABCI, 26)
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previousTotalVotingPower = css[0].GetRoundState().LastValidators.TotalVotingPower()
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css, updateValidatorTx)
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waitForAndValidateBlockWithTx(t, nVals, activeVals, eventChans, css, updateValidatorTx)
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css)
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waitForAndValidateBlock(t, nVals, activeVals, eventChans, css)
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if css[0].GetRoundState().LastValidators.TotalVotingPower() == previousTotalVotingPower {
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t.Fatalf("expected voting power to change (before: %d, after: %d)", previousTotalVotingPower, css[0].GetRoundState().LastValidators.TotalVotingPower())
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}
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}
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func TestReactorValidatorSetChanges(t *testing.T) {
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nPeers := 7
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nVals := 4
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css := randConsensusNetWithPeers(nVals, nPeers, "consensus_val_set_changes_test", newMockTickerFunc(true), newPersistentKVStore)
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logger := log.TestingLogger()
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reactors, eventChans, eventBuses := startConsensusNet(t, css, nPeers)
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defer stopConsensusNet(logger, reactors, eventBuses)
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// map of active validators
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activeVals := make(map[string]struct{})
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for i := 0; i < nVals; i++ {
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activeVals[string(css[i].privValidator.GetAddress())] = struct{}{}
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}
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// wait till everyone makes block 1
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timeoutWaitGroup(t, nPeers, func(j int) {
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<-eventChans[j]
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}, css)
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//---------------------------------------------------------------------------
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logger.Info("---------------------------- Testing adding one validator")
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newValidatorPubKey1 := css[nVals].privValidator.GetPubKey()
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valPubKey1ABCI := types.TM2PB.PubKey(newValidatorPubKey1)
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newValidatorTx1 := kvstore.MakeValSetChangeTx(valPubKey1ABCI, testMinPower)
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// wait till everyone makes block 2
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// ensure the commit includes all validators
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// send newValTx to change vals in block 3
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waitForAndValidateBlock(t, nPeers, activeVals, eventChans, css, newValidatorTx1)
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// wait till everyone makes block 3.
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// it includes the commit for block 2, which is by the original validator set
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waitForAndValidateBlockWithTx(t, nPeers, activeVals, eventChans, css, newValidatorTx1)
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// wait till everyone makes block 4.
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// it includes the commit for block 3, which is by the original validator set
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waitForAndValidateBlock(t, nPeers, activeVals, eventChans, css)
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// the commits for block 4 should be with the updated validator set
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activeVals[string(newValidatorPubKey1.Address())] = struct{}{}
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// wait till everyone makes block 5
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// it includes the commit for block 4, which should have the updated validator set
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waitForBlockWithUpdatedValsAndValidateIt(t, nPeers, activeVals, eventChans, css)
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//---------------------------------------------------------------------------
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logger.Info("---------------------------- Testing changing the voting power of one validator")
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updateValidatorPubKey1 := css[nVals].privValidator.GetPubKey()
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updatePubKey1ABCI := types.TM2PB.PubKey(updateValidatorPubKey1)
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updateValidatorTx1 := kvstore.MakeValSetChangeTx(updatePubKey1ABCI, 25)
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previousTotalVotingPower := css[nVals].GetRoundState().LastValidators.TotalVotingPower()
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waitForAndValidateBlock(t, nPeers, activeVals, eventChans, css, updateValidatorTx1)
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waitForAndValidateBlockWithTx(t, nPeers, activeVals, eventChans, css, updateValidatorTx1)
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waitForAndValidateBlock(t, nPeers, activeVals, eventChans, css)
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waitForBlockWithUpdatedValsAndValidateIt(t, nPeers, activeVals, eventChans, css)
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if css[nVals].GetRoundState().LastValidators.TotalVotingPower() == previousTotalVotingPower {
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t.Errorf("expected voting power to change (before: %d, after: %d)", previousTotalVotingPower, css[nVals].GetRoundState().LastValidators.TotalVotingPower())
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}
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//---------------------------------------------------------------------------
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logger.Info("---------------------------- Testing adding two validators at once")
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newValidatorPubKey2 := css[nVals+1].privValidator.GetPubKey()
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newVal2ABCI := types.TM2PB.PubKey(newValidatorPubKey2)
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newValidatorTx2 := kvstore.MakeValSetChangeTx(newVal2ABCI, testMinPower)
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newValidatorPubKey3 := css[nVals+2].privValidator.GetPubKey()
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newVal3ABCI := types.TM2PB.PubKey(newValidatorPubKey3)
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newValidatorTx3 := kvstore.MakeValSetChangeTx(newVal3ABCI, testMinPower)
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waitForAndValidateBlock(t, nPeers, activeVals, eventChans, css, newValidatorTx2, newValidatorTx3)
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waitForAndValidateBlockWithTx(t, nPeers, activeVals, eventChans, css, newValidatorTx2, newValidatorTx3)
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waitForAndValidateBlock(t, nPeers, activeVals, eventChans, css)
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activeVals[string(newValidatorPubKey2.Address())] = struct{}{}
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activeVals[string(newValidatorPubKey3.Address())] = struct{}{}
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waitForBlockWithUpdatedValsAndValidateIt(t, nPeers, activeVals, eventChans, css)
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//---------------------------------------------------------------------------
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logger.Info("---------------------------- Testing removing two validators at once")
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removeValidatorTx2 := kvstore.MakeValSetChangeTx(newVal2ABCI, 0)
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removeValidatorTx3 := kvstore.MakeValSetChangeTx(newVal3ABCI, 0)
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waitForAndValidateBlock(t, nPeers, activeVals, eventChans, css, removeValidatorTx2, removeValidatorTx3)
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waitForAndValidateBlockWithTx(t, nPeers, activeVals, eventChans, css, removeValidatorTx2, removeValidatorTx3)
|
|
waitForAndValidateBlock(t, nPeers, activeVals, eventChans, css)
|
|
delete(activeVals, string(newValidatorPubKey2.Address()))
|
|
delete(activeVals, string(newValidatorPubKey3.Address()))
|
|
waitForBlockWithUpdatedValsAndValidateIt(t, nPeers, activeVals, eventChans, css)
|
|
}
|
|
|
|
// Check we can make blocks with skip_timeout_commit=false
|
|
func TestReactorWithTimeoutCommit(t *testing.T) {
|
|
N := 4
|
|
css := randConsensusNet(N, "consensus_reactor_with_timeout_commit_test", newMockTickerFunc(false), newCounter)
|
|
// override default SkipTimeoutCommit == true for tests
|
|
for i := 0; i < N; i++ {
|
|
css[i].config.SkipTimeoutCommit = false
|
|
}
|
|
|
|
reactors, eventChans, eventBuses := startConsensusNet(t, css, N-1)
|
|
defer stopConsensusNet(log.TestingLogger(), reactors, eventBuses)
|
|
|
|
// wait till everyone makes the first new block
|
|
timeoutWaitGroup(t, N-1, func(j int) {
|
|
<-eventChans[j]
|
|
}, css)
|
|
}
|
|
|
|
func waitForAndValidateBlock(t *testing.T, n int, activeVals map[string]struct{}, eventChans []chan interface{}, css []*ConsensusState, txs ...[]byte) {
|
|
timeoutWaitGroup(t, n, func(j int) {
|
|
css[j].Logger.Debug("waitForAndValidateBlock")
|
|
newBlockI, ok := <-eventChans[j]
|
|
if !ok {
|
|
return
|
|
}
|
|
newBlock := newBlockI.(types.EventDataNewBlock).Block
|
|
css[j].Logger.Debug("waitForAndValidateBlock: Got block", "height", newBlock.Height)
|
|
err := validateBlock(newBlock, activeVals)
|
|
assert.Nil(t, err)
|
|
for _, tx := range txs {
|
|
css[j].mempool.CheckTx(tx, nil)
|
|
assert.Nil(t, err)
|
|
}
|
|
}, css)
|
|
}
|
|
|
|
func waitForAndValidateBlockWithTx(t *testing.T, n int, activeVals map[string]struct{}, eventChans []chan interface{}, css []*ConsensusState, txs ...[]byte) {
|
|
timeoutWaitGroup(t, n, func(j int) {
|
|
ntxs := 0
|
|
BLOCK_TX_LOOP:
|
|
for {
|
|
css[j].Logger.Debug("waitForAndValidateBlockWithTx", "ntxs", ntxs)
|
|
newBlockI, ok := <-eventChans[j]
|
|
if !ok {
|
|
return
|
|
}
|
|
newBlock := newBlockI.(types.EventDataNewBlock).Block
|
|
css[j].Logger.Debug("waitForAndValidateBlockWithTx: Got block", "height", newBlock.Height)
|
|
err := validateBlock(newBlock, activeVals)
|
|
assert.Nil(t, err)
|
|
|
|
// check that txs match the txs we're waiting for.
|
|
// note they could be spread over multiple blocks,
|
|
// but they should be in order.
|
|
for _, tx := range newBlock.Data.Txs {
|
|
assert.EqualValues(t, txs[ntxs], tx)
|
|
ntxs++
|
|
}
|
|
|
|
if ntxs == len(txs) {
|
|
break BLOCK_TX_LOOP
|
|
}
|
|
}
|
|
|
|
}, css)
|
|
}
|
|
|
|
func waitForBlockWithUpdatedValsAndValidateIt(t *testing.T, n int, updatedVals map[string]struct{}, eventChans []chan interface{}, css []*ConsensusState) {
|
|
timeoutWaitGroup(t, n, func(j int) {
|
|
|
|
var newBlock *types.Block
|
|
LOOP:
|
|
for {
|
|
css[j].Logger.Debug("waitForBlockWithUpdatedValsAndValidateIt")
|
|
newBlockI, ok := <-eventChans[j]
|
|
if !ok {
|
|
return
|
|
}
|
|
newBlock = newBlockI.(types.EventDataNewBlock).Block
|
|
if newBlock.LastCommit.Size() == len(updatedVals) {
|
|
css[j].Logger.Debug("waitForBlockWithUpdatedValsAndValidateIt: Got block", "height", newBlock.Height)
|
|
break LOOP
|
|
} else {
|
|
css[j].Logger.Debug("waitForBlockWithUpdatedValsAndValidateIt: Got block with no new validators. Skipping", "height", newBlock.Height)
|
|
}
|
|
}
|
|
|
|
err := validateBlock(newBlock, updatedVals)
|
|
assert.Nil(t, err)
|
|
}, css)
|
|
}
|
|
|
|
// expects high synchrony!
|
|
func validateBlock(block *types.Block, activeVals map[string]struct{}) error {
|
|
if block.LastCommit.Size() != len(activeVals) {
|
|
return fmt.Errorf("Commit size doesn't match number of active validators. Got %d, expected %d", block.LastCommit.Size(), len(activeVals))
|
|
}
|
|
|
|
for _, vote := range block.LastCommit.Precommits {
|
|
if _, ok := activeVals[string(vote.ValidatorAddress)]; !ok {
|
|
return fmt.Errorf("Found vote for unactive validator %X", vote.ValidatorAddress)
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func timeoutWaitGroup(t *testing.T, n int, f func(int), css []*ConsensusState) {
|
|
wg := new(sync.WaitGroup)
|
|
wg.Add(n)
|
|
for i := 0; i < n; i++ {
|
|
go func(j int) {
|
|
f(j)
|
|
wg.Done()
|
|
}(i)
|
|
}
|
|
|
|
done := make(chan struct{})
|
|
go func() {
|
|
wg.Wait()
|
|
close(done)
|
|
}()
|
|
|
|
// we're running many nodes in-process, possibly in in a virtual machine,
|
|
// and spewing debug messages - making a block could take a while,
|
|
timeout := time.Second * 300
|
|
|
|
select {
|
|
case <-done:
|
|
case <-time.After(timeout):
|
|
for i, cs := range css {
|
|
t.Log("#################")
|
|
t.Log("Validator", i)
|
|
t.Log(cs.GetRoundState())
|
|
t.Log("")
|
|
}
|
|
os.Stdout.Write([]byte("pprof.Lookup('goroutine'):\n"))
|
|
pprof.Lookup("goroutine").WriteTo(os.Stdout, 1)
|
|
capture()
|
|
panic("Timed out waiting for all validators to commit a block")
|
|
}
|
|
}
|
|
|
|
func capture() {
|
|
trace := make([]byte, 10240000)
|
|
count := runtime.Stack(trace, true)
|
|
fmt.Printf("Stack of %d bytes: %s\n", count, trace)
|
|
}
|