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687 lines
20 KiB
687 lines
20 KiB
package consensus
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path"
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"runtime"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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"github.com/tendermint/tendermint/abci/example/kvstore"
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abci "github.com/tendermint/tendermint/abci/types"
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crypto "github.com/tendermint/tendermint/crypto"
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auto "github.com/tendermint/tendermint/libs/autofile"
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cmn "github.com/tendermint/tendermint/libs/common"
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dbm "github.com/tendermint/tendermint/libs/db"
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cfg "github.com/tendermint/tendermint/config"
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"github.com/tendermint/tendermint/privval"
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"github.com/tendermint/tendermint/proxy"
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sm "github.com/tendermint/tendermint/state"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/libs/log"
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)
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var consensusReplayConfig *cfg.Config
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func init() {
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consensusReplayConfig = ResetConfig("consensus_replay_test")
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}
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// These tests ensure we can always recover from failure at any part of the consensus process.
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// There are two general failure scenarios: failure during consensus, and failure while applying the block.
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// Only the latter interacts with the app and store,
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// but the former has to deal with restrictions on re-use of priv_validator keys.
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// The `WAL Tests` are for failures during the consensus;
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// the `Handshake Tests` are for failures in applying the block.
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// With the help of the WAL, we can recover from it all!
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//------------------------------------------------------------------------------------------
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// WAL Tests
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// TODO: It would be better to verify explicitly which states we can recover from without the wal
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// and which ones we need the wal for - then we'd also be able to only flush the
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// wal writer when we need to, instead of with every message.
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func startNewConsensusStateAndWaitForBlock(t *testing.T, lastBlockHeight int64, blockDB dbm.DB, stateDB dbm.DB) {
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logger := log.TestingLogger()
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state, _ := sm.LoadStateFromDBOrGenesisFile(stateDB, consensusReplayConfig.GenesisFile())
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privValidator := loadPrivValidator(consensusReplayConfig)
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cs := newConsensusStateWithConfigAndBlockStore(consensusReplayConfig, state, privValidator, kvstore.NewKVStoreApplication(), blockDB)
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cs.SetLogger(logger)
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bytes, _ := ioutil.ReadFile(cs.config.WalFile())
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// fmt.Printf("====== WAL: \n\r%s\n", bytes)
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t.Logf("====== WAL: \n\r%X\n", bytes)
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err := cs.Start()
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require.NoError(t, err)
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defer cs.Stop()
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// This is just a signal that we haven't halted; its not something contained
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// in the WAL itself. Assuming the consensus state is running, replay of any
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// WAL, including the empty one, should eventually be followed by a new
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// block, or else something is wrong.
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newBlockCh := make(chan interface{}, 1)
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err = cs.eventBus.Subscribe(context.Background(), testSubscriber, types.EventQueryNewBlock, newBlockCh)
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require.NoError(t, err)
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select {
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case <-newBlockCh:
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case <-time.After(60 * time.Second):
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t.Fatalf("Timed out waiting for new block (see trace above)")
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}
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}
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func sendTxs(cs *ConsensusState, ctx context.Context) {
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for i := 0; i < 256; i++ {
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select {
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case <-ctx.Done():
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return
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default:
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tx := []byte{byte(i)}
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cs.mempool.CheckTx(tx, nil)
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i++
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}
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}
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}
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// TestWALCrash uses crashing WAL to test we can recover from any WAL failure.
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func TestWALCrash(t *testing.T) {
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testCases := []struct {
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name string
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initFn func(dbm.DB, *ConsensusState, context.Context)
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heightToStop int64
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}{
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{"empty block",
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func(stateDB dbm.DB, cs *ConsensusState, ctx context.Context) {},
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1},
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{"block with a smaller part size",
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func(stateDB dbm.DB, cs *ConsensusState, ctx context.Context) {
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// XXX: is there a better way to change BlockPartSizeBytes?
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cs.state.ConsensusParams.BlockPartSizeBytes = 512
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sm.SaveState(stateDB, cs.state)
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go sendTxs(cs, ctx)
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},
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1},
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{"many non-empty blocks",
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func(stateDB dbm.DB, cs *ConsensusState, ctx context.Context) {
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go sendTxs(cs, ctx)
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},
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3},
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}
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for _, tc := range testCases {
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t.Run(tc.name, func(t *testing.T) {
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crashWALandCheckLiveness(t, tc.initFn, tc.heightToStop)
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})
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}
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}
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func crashWALandCheckLiveness(t *testing.T, initFn func(dbm.DB, *ConsensusState, context.Context), heightToStop int64) {
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walPaniced := make(chan error)
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crashingWal := &crashingWAL{panicCh: walPaniced, heightToStop: heightToStop}
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i := 1
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LOOP:
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for {
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// fmt.Printf("====== LOOP %d\n", i)
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t.Logf("====== LOOP %d\n", i)
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// create consensus state from a clean slate
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logger := log.NewNopLogger()
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stateDB := dbm.NewMemDB()
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state, _ := sm.MakeGenesisStateFromFile(consensusReplayConfig.GenesisFile())
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privValidator := loadPrivValidator(consensusReplayConfig)
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blockDB := dbm.NewMemDB()
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cs := newConsensusStateWithConfigAndBlockStore(consensusReplayConfig, state, privValidator, kvstore.NewKVStoreApplication(), blockDB)
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cs.SetLogger(logger)
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// start sending transactions
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ctx, cancel := context.WithCancel(context.Background())
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initFn(stateDB, cs, ctx)
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// clean up WAL file from the previous iteration
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walFile := cs.config.WalFile()
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os.Remove(walFile)
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// set crashing WAL
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csWal, err := cs.OpenWAL(walFile)
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require.NoError(t, err)
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crashingWal.next = csWal
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// reset the message counter
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crashingWal.msgIndex = 1
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cs.wal = crashingWal
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// start consensus state
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err = cs.Start()
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require.NoError(t, err)
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i++
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select {
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case err := <-walPaniced:
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t.Logf("WAL paniced: %v", err)
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// make sure we can make blocks after a crash
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startNewConsensusStateAndWaitForBlock(t, cs.Height, blockDB, stateDB)
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// stop consensus state and transactions sender (initFn)
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cs.Stop()
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cancel()
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// if we reached the required height, exit
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if _, ok := err.(ReachedHeightToStopError); ok {
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break LOOP
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}
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case <-time.After(10 * time.Second):
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t.Fatal("WAL did not panic for 10 seconds (check the log)")
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}
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}
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}
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// crashingWAL is a WAL which crashes or rather simulates a crash during Save
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// (before and after). It remembers a message for which we last panicked
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// (lastPanicedForMsgIndex), so we don't panic for it in subsequent iterations.
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type crashingWAL struct {
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next WAL
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panicCh chan error
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heightToStop int64
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msgIndex int // current message index
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lastPanicedForMsgIndex int // last message for which we panicked
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}
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// WALWriteError indicates a WAL crash.
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type WALWriteError struct {
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msg string
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}
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func (e WALWriteError) Error() string {
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return e.msg
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}
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// ReachedHeightToStopError indicates we've reached the required consensus
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// height and may exit.
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type ReachedHeightToStopError struct {
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height int64
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}
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func (e ReachedHeightToStopError) Error() string {
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return fmt.Sprintf("reached height to stop %d", e.height)
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}
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// Write simulate WAL's crashing by sending an error to the panicCh and then
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// exiting the cs.receiveRoutine.
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func (w *crashingWAL) Write(m WALMessage) {
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if endMsg, ok := m.(EndHeightMessage); ok {
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if endMsg.Height == w.heightToStop {
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w.panicCh <- ReachedHeightToStopError{endMsg.Height}
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runtime.Goexit()
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} else {
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w.next.Write(m)
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}
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return
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}
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if w.msgIndex > w.lastPanicedForMsgIndex {
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w.lastPanicedForMsgIndex = w.msgIndex
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_, file, line, _ := runtime.Caller(1)
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w.panicCh <- WALWriteError{fmt.Sprintf("failed to write %T to WAL (fileline: %s:%d)", m, file, line)}
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runtime.Goexit()
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} else {
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w.msgIndex++
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w.next.Write(m)
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}
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}
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func (w *crashingWAL) WriteSync(m WALMessage) {
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w.Write(m)
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}
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func (w *crashingWAL) Group() *auto.Group { return w.next.Group() }
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func (w *crashingWAL) SearchForEndHeight(height int64, options *WALSearchOptions) (gr *auto.GroupReader, found bool, err error) {
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return w.next.SearchForEndHeight(height, options)
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}
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func (w *crashingWAL) Start() error { return w.next.Start() }
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func (w *crashingWAL) Stop() error { return w.next.Stop() }
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func (w *crashingWAL) Wait() { w.next.Wait() }
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//------------------------------------------------------------------------------------------
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// Handshake Tests
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const (
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NUM_BLOCKS = 6
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)
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var (
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mempool = sm.MockMempool{}
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evpool = sm.MockEvidencePool{}
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)
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//---------------------------------------
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// Test handshake/replay
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// 0 - all synced up
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// 1 - saved block but app and state are behind
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// 2 - save block and committed but state is behind
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var modes = []uint{0, 1, 2}
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// Sync from scratch
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func TestHandshakeReplayAll(t *testing.T) {
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for _, m := range modes {
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testHandshakeReplay(t, 0, m)
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}
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}
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// Sync many, not from scratch
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func TestHandshakeReplaySome(t *testing.T) {
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for _, m := range modes {
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testHandshakeReplay(t, 1, m)
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}
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}
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// Sync from lagging by one
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func TestHandshakeReplayOne(t *testing.T) {
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for _, m := range modes {
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testHandshakeReplay(t, NUM_BLOCKS-1, m)
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}
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}
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// Sync from caught up
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func TestHandshakeReplayNone(t *testing.T) {
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for _, m := range modes {
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testHandshakeReplay(t, NUM_BLOCKS, m)
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}
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}
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func tempWALWithData(data []byte) string {
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walFile, err := ioutil.TempFile("", "wal")
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if err != nil {
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panic(fmt.Errorf("failed to create temp WAL file: %v", err))
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}
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_, err = walFile.Write(data)
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if err != nil {
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panic(fmt.Errorf("failed to write to temp WAL file: %v", err))
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}
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if err := walFile.Close(); err != nil {
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panic(fmt.Errorf("failed to close temp WAL file: %v", err))
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}
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return walFile.Name()
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}
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// Make some blocks. Start a fresh app and apply nBlocks blocks. Then restart the app and sync it up with the remaining blocks
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func testHandshakeReplay(t *testing.T, nBlocks int, mode uint) {
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config := ResetConfig("proxy_test_")
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walBody, err := WALWithNBlocks(NUM_BLOCKS)
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if err != nil {
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t.Fatal(err)
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}
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walFile := tempWALWithData(walBody)
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config.Consensus.SetWalFile(walFile)
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privVal := privval.LoadFilePV(config.PrivValidatorFile())
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wal, err := NewWAL(walFile)
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if err != nil {
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t.Fatal(err)
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}
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wal.SetLogger(log.TestingLogger())
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if err := wal.Start(); err != nil {
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t.Fatal(err)
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}
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defer wal.Stop()
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chain, commits, err := makeBlockchainFromWAL(wal)
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if err != nil {
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t.Fatalf(err.Error())
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}
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stateDB, state, store := stateAndStore(config, privVal.GetPubKey())
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store.chain = chain
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store.commits = commits
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// run the chain through state.ApplyBlock to build up the tendermint state
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state = buildTMStateFromChain(config, stateDB, state, chain, mode)
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latestAppHash := state.AppHash
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// make a new client creator
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kvstoreApp := kvstore.NewPersistentKVStoreApplication(path.Join(config.DBDir(), "2"))
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clientCreator2 := proxy.NewLocalClientCreator(kvstoreApp)
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if nBlocks > 0 {
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// run nBlocks against a new client to build up the app state.
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// use a throwaway tendermint state
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proxyApp := proxy.NewAppConns(clientCreator2, nil)
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stateDB, state, _ := stateAndStore(config, privVal.GetPubKey())
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buildAppStateFromChain(proxyApp, stateDB, state, chain, nBlocks, mode)
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}
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// now start the app using the handshake - it should sync
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genDoc, _ := sm.MakeGenesisDocFromFile(config.GenesisFile())
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handshaker := NewHandshaker(stateDB, state, store, genDoc)
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proxyApp := proxy.NewAppConns(clientCreator2, handshaker)
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if err := proxyApp.Start(); err != nil {
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t.Fatalf("Error starting proxy app connections: %v", err)
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}
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defer proxyApp.Stop()
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// get the latest app hash from the app
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res, err := proxyApp.Query().InfoSync(abci.RequestInfo{Version: ""})
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if err != nil {
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t.Fatal(err)
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}
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// the app hash should be synced up
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if !bytes.Equal(latestAppHash, res.LastBlockAppHash) {
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t.Fatalf("Expected app hashes to match after handshake/replay. got %X, expected %X", res.LastBlockAppHash, latestAppHash)
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}
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expectedBlocksToSync := NUM_BLOCKS - nBlocks
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if nBlocks == NUM_BLOCKS && mode > 0 {
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expectedBlocksToSync++
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} else if nBlocks > 0 && mode == 1 {
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expectedBlocksToSync++
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}
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if handshaker.NBlocks() != expectedBlocksToSync {
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t.Fatalf("Expected handshake to sync %d blocks, got %d", expectedBlocksToSync, handshaker.NBlocks())
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}
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}
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func applyBlock(stateDB dbm.DB, st sm.State, blk *types.Block, proxyApp proxy.AppConns) sm.State {
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testPartSize := st.ConsensusParams.BlockPartSizeBytes
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blockExec := sm.NewBlockExecutor(stateDB, log.TestingLogger(), proxyApp.Consensus(), mempool, evpool)
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blkID := types.BlockID{blk.Hash(), blk.MakePartSet(testPartSize).Header()}
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newState, err := blockExec.ApplyBlock(st, blkID, blk)
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if err != nil {
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panic(err)
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}
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return newState
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}
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func buildAppStateFromChain(proxyApp proxy.AppConns, stateDB dbm.DB,
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state sm.State, chain []*types.Block, nBlocks int, mode uint) {
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// start a new app without handshake, play nBlocks blocks
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if err := proxyApp.Start(); err != nil {
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panic(err)
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}
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defer proxyApp.Stop()
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validators := types.TM2PB.Validators(state.Validators)
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if _, err := proxyApp.Consensus().InitChainSync(abci.RequestInitChain{
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Validators: validators,
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}); err != nil {
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panic(err)
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}
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switch mode {
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case 0:
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for i := 0; i < nBlocks; i++ {
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block := chain[i]
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state = applyBlock(stateDB, state, block, proxyApp)
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}
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case 1, 2:
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for i := 0; i < nBlocks-1; i++ {
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block := chain[i]
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state = applyBlock(stateDB, state, block, proxyApp)
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}
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if mode == 2 {
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// update the kvstore height and apphash
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// as if we ran commit but not
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state = applyBlock(stateDB, state, chain[nBlocks-1], proxyApp)
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}
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}
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}
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func buildTMStateFromChain(config *cfg.Config, stateDB dbm.DB, state sm.State, chain []*types.Block, mode uint) sm.State {
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// run the whole chain against this client to build up the tendermint state
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clientCreator := proxy.NewLocalClientCreator(kvstore.NewPersistentKVStoreApplication(path.Join(config.DBDir(), "1")))
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proxyApp := proxy.NewAppConns(clientCreator, nil) // sm.NewHandshaker(config, state, store, ReplayLastBlock))
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if err := proxyApp.Start(); err != nil {
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panic(err)
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}
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defer proxyApp.Stop()
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validators := types.TM2PB.Validators(state.Validators)
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if _, err := proxyApp.Consensus().InitChainSync(abci.RequestInitChain{
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Validators: validators,
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}); err != nil {
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panic(err)
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}
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switch mode {
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case 0:
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// sync right up
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for _, block := range chain {
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state = applyBlock(stateDB, state, block, proxyApp)
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}
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case 1, 2:
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// sync up to the penultimate as if we stored the block.
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// whether we commit or not depends on the appHash
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for _, block := range chain[:len(chain)-1] {
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state = applyBlock(stateDB, state, block, proxyApp)
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}
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// apply the final block to a state copy so we can
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// get the right next appHash but keep the state back
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applyBlock(stateDB, state, chain[len(chain)-1], proxyApp)
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}
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return state
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}
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//--------------------------
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// utils for making blocks
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func makeBlockchainFromWAL(wal WAL) ([]*types.Block, []*types.Commit, error) {
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// Search for height marker
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gr, found, err := wal.SearchForEndHeight(0, &WALSearchOptions{})
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if err != nil {
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return nil, nil, err
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}
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if !found {
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return nil, nil, errors.New(cmn.Fmt("WAL does not contain height %d.", 1))
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}
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defer gr.Close() // nolint: errcheck
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// log.Notice("Build a blockchain by reading from the WAL")
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var blocks []*types.Block
|
|
var commits []*types.Commit
|
|
|
|
var thisBlockParts *types.PartSet
|
|
var thisBlockCommit *types.Commit
|
|
var height int64
|
|
|
|
dec := NewWALDecoder(gr)
|
|
for {
|
|
msg, err := dec.Decode()
|
|
if err == io.EOF {
|
|
break
|
|
} else if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
|
|
piece := readPieceFromWAL(msg)
|
|
if piece == nil {
|
|
continue
|
|
}
|
|
|
|
switch p := piece.(type) {
|
|
case EndHeightMessage:
|
|
// if its not the first one, we have a full block
|
|
if thisBlockParts != nil {
|
|
var block = new(types.Block)
|
|
_, err = cdc.UnmarshalBinaryReader(thisBlockParts.GetReader(), block, 0)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if block.Height != height+1 {
|
|
panic(cmn.Fmt("read bad block from wal. got height %d, expected %d", block.Height, height+1))
|
|
}
|
|
commitHeight := thisBlockCommit.Precommits[0].Height
|
|
if commitHeight != height+1 {
|
|
panic(cmn.Fmt("commit doesnt match. got height %d, expected %d", commitHeight, height+1))
|
|
}
|
|
blocks = append(blocks, block)
|
|
commits = append(commits, thisBlockCommit)
|
|
height++
|
|
}
|
|
case *types.PartSetHeader:
|
|
thisBlockParts = types.NewPartSetFromHeader(*p)
|
|
case *types.Part:
|
|
_, err := thisBlockParts.AddPart(p)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
case *types.Vote:
|
|
if p.Type == types.VoteTypePrecommit {
|
|
thisBlockCommit = &types.Commit{
|
|
BlockID: p.BlockID,
|
|
Precommits: []*types.Vote{p},
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// grab the last block too
|
|
var block = new(types.Block)
|
|
_, err = cdc.UnmarshalBinaryReader(thisBlockParts.GetReader(), block, 0)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
if block.Height != height+1 {
|
|
panic(cmn.Fmt("read bad block from wal. got height %d, expected %d", block.Height, height+1))
|
|
}
|
|
commitHeight := thisBlockCommit.Precommits[0].Height
|
|
if commitHeight != height+1 {
|
|
panic(cmn.Fmt("commit doesnt match. got height %d, expected %d", commitHeight, height+1))
|
|
}
|
|
blocks = append(blocks, block)
|
|
commits = append(commits, thisBlockCommit)
|
|
return blocks, commits, nil
|
|
}
|
|
|
|
func readPieceFromWAL(msg *TimedWALMessage) interface{} {
|
|
// for logging
|
|
switch m := msg.Msg.(type) {
|
|
case msgInfo:
|
|
switch msg := m.Msg.(type) {
|
|
case *ProposalMessage:
|
|
return &msg.Proposal.BlockPartsHeader
|
|
case *BlockPartMessage:
|
|
return msg.Part
|
|
case *VoteMessage:
|
|
return msg.Vote
|
|
}
|
|
case EndHeightMessage:
|
|
return m
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// fresh state and mock store
|
|
func stateAndStore(config *cfg.Config, pubKey crypto.PubKey) (dbm.DB, sm.State, *mockBlockStore) {
|
|
stateDB := dbm.NewMemDB()
|
|
state, _ := sm.MakeGenesisStateFromFile(config.GenesisFile())
|
|
store := NewMockBlockStore(config, state.ConsensusParams)
|
|
return stateDB, state, store
|
|
}
|
|
|
|
//----------------------------------
|
|
// mock block store
|
|
|
|
type mockBlockStore struct {
|
|
config *cfg.Config
|
|
params types.ConsensusParams
|
|
chain []*types.Block
|
|
commits []*types.Commit
|
|
}
|
|
|
|
// TODO: NewBlockStore(db.NewMemDB) ...
|
|
func NewMockBlockStore(config *cfg.Config, params types.ConsensusParams) *mockBlockStore {
|
|
return &mockBlockStore{config, params, nil, nil}
|
|
}
|
|
|
|
func (bs *mockBlockStore) Height() int64 { return int64(len(bs.chain)) }
|
|
func (bs *mockBlockStore) LoadBlock(height int64) *types.Block { return bs.chain[height-1] }
|
|
func (bs *mockBlockStore) LoadBlockMeta(height int64) *types.BlockMeta {
|
|
block := bs.chain[height-1]
|
|
return &types.BlockMeta{
|
|
BlockID: types.BlockID{block.Hash(), block.MakePartSet(bs.params.BlockPartSizeBytes).Header()},
|
|
Header: block.Header,
|
|
}
|
|
}
|
|
func (bs *mockBlockStore) LoadBlockPart(height int64, index int) *types.Part { return nil }
|
|
func (bs *mockBlockStore) SaveBlock(block *types.Block, blockParts *types.PartSet, seenCommit *types.Commit) {
|
|
}
|
|
func (bs *mockBlockStore) LoadBlockCommit(height int64) *types.Commit {
|
|
return bs.commits[height-1]
|
|
}
|
|
func (bs *mockBlockStore) LoadSeenCommit(height int64) *types.Commit {
|
|
return bs.commits[height-1]
|
|
}
|
|
|
|
//----------------------------------------
|
|
|
|
func TestInitChainUpdateValidators(t *testing.T) {
|
|
val, _ := types.RandValidator(true, 10)
|
|
vals := types.NewValidatorSet([]*types.Validator{val})
|
|
app := &initChainApp{vals: types.TM2PB.Validators(vals)}
|
|
clientCreator := proxy.NewLocalClientCreator(app)
|
|
|
|
config := ResetConfig("proxy_test_")
|
|
privVal := privval.LoadFilePV(config.PrivValidatorFile())
|
|
stateDB, state, store := stateAndStore(config, privVal.GetPubKey())
|
|
|
|
oldValAddr := state.Validators.Validators[0].Address
|
|
|
|
// now start the app using the handshake - it should sync
|
|
genDoc, _ := sm.MakeGenesisDocFromFile(config.GenesisFile())
|
|
handshaker := NewHandshaker(stateDB, state, store, genDoc)
|
|
proxyApp := proxy.NewAppConns(clientCreator, handshaker)
|
|
if err := proxyApp.Start(); err != nil {
|
|
t.Fatalf("Error starting proxy app connections: %v", err)
|
|
}
|
|
defer proxyApp.Stop()
|
|
|
|
// reload the state, check the validator set was updated
|
|
state = sm.LoadState(stateDB)
|
|
|
|
newValAddr := state.Validators.Validators[0].Address
|
|
expectValAddr := val.Address
|
|
assert.NotEqual(t, oldValAddr, newValAddr)
|
|
assert.Equal(t, newValAddr, expectValAddr)
|
|
}
|
|
|
|
func newInitChainApp(vals []abci.Validator) *initChainApp {
|
|
return &initChainApp{
|
|
vals: vals,
|
|
}
|
|
}
|
|
|
|
// returns the vals on InitChain
|
|
type initChainApp struct {
|
|
abci.BaseApplication
|
|
vals []abci.Validator
|
|
}
|
|
|
|
func (ica *initChainApp) InitChain(req abci.RequestInitChain) abci.ResponseInitChain {
|
|
return abci.ResponseInitChain{
|
|
Validators: ica.vals,
|
|
}
|
|
}
|