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181 lines
5.6 KiB
181 lines
5.6 KiB
package consensus
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import (
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"bufio"
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"bytes"
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"fmt"
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"math/rand"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/pkg/errors"
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"github.com/tendermint/abci/example/dummy"
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bc "github.com/tendermint/tendermint/blockchain"
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cfg "github.com/tendermint/tendermint/config"
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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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auto "github.com/tendermint/tmlibs/autofile"
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"github.com/tendermint/tmlibs/db"
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"github.com/tendermint/tmlibs/log"
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)
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// WALWithNBlocks generates a consensus WAL. It does this by spining up a
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// stripped down version of node (proxy app, event bus, consensus state) with a
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// persistent dummy application and special consensus wal instance
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// (byteBufferWAL) and waits until numBlocks are created. Then it returns a WAL
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// content.
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func WALWithNBlocks(numBlocks int) (data []byte, err error) {
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config := getConfig()
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app := dummy.NewPersistentDummyApplication(filepath.Join(config.DBDir(), "wal_generator"))
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logger := log.NewNopLogger() // log.TestingLogger().With("wal_generator", "wal_generator")
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/////////////////////////////////////////////////////////////////////////////
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// COPY PASTE FROM node.go WITH A FEW MODIFICATIONS
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// NOTE: we can't import node package because of circular dependency
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privValidatorFile := config.PrivValidatorFile()
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privValidator := types.LoadOrGenPrivValidatorFS(privValidatorFile)
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genDoc, err := types.GenesisDocFromFile(config.GenesisFile())
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if err != nil {
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return nil, errors.Wrap(err, "failed to read genesis file")
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}
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stateDB := db.NewMemDB()
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blockStoreDB := db.NewMemDB()
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state, err := sm.MakeGenesisState(stateDB, genDoc)
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state.SetLogger(logger.With("module", "state"))
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if err != nil {
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return nil, errors.Wrap(err, "failed to make genesis state")
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}
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blockStore := bc.NewBlockStore(blockStoreDB)
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handshaker := NewHandshaker(state, blockStore)
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proxyApp := proxy.NewAppConns(proxy.NewLocalClientCreator(app), handshaker)
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proxyApp.SetLogger(logger.With("module", "proxy"))
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if err := proxyApp.Start(); err != nil {
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return nil, errors.Wrap(err, "failed to start proxy app connections")
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}
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defer proxyApp.Stop()
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eventBus := types.NewEventBus()
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eventBus.SetLogger(logger.With("module", "events"))
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if err := eventBus.Start(); err != nil {
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return nil, errors.Wrap(err, "failed to start event bus")
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}
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mempool := types.MockMempool{}
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consensusState := NewConsensusState(config.Consensus, state.Copy(), proxyApp.Consensus(), blockStore, mempool)
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consensusState.SetLogger(logger)
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consensusState.SetEventBus(eventBus)
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if privValidator != nil {
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consensusState.SetPrivValidator(privValidator)
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}
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// END OF COPY PASTE
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/////////////////////////////////////////////////////////////////////////////
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// set consensus wal to buffered WAL, which will write all incoming msgs to buffer
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var b bytes.Buffer
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wr := bufio.NewWriter(&b)
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numBlocksWritten := make(chan struct{})
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wal := &byteBufferWAL{enc: NewWALEncoder(wr), heightToStop: int64(numBlocks), signalWhenStopsTo: numBlocksWritten}
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// see wal.go#103
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wal.Save(EndHeightMessage{0})
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consensusState.wal = wal
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if err := consensusState.Start(); err != nil {
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return nil, errors.Wrap(err, "failed to start consensus state")
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}
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defer consensusState.Stop()
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select {
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case <-numBlocksWritten:
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wr.Flush()
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return b.Bytes(), nil
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case <-time.After(time.Duration(2*numBlocks) * time.Second):
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return b.Bytes(), fmt.Errorf("waited too long for tendermint to produce %d blocks", numBlocks)
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}
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}
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// f**ing long, but unique for each test
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func makePathname() string {
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// get path
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p, err := os.Getwd()
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if err != nil {
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panic(err)
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}
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fmt.Println(p)
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sep := string(filepath.Separator)
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return strings.Replace(p, sep, "_", -1)
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}
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func randPort() int {
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// returns between base and base + spread
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base, spread := 20000, 20000
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return base + rand.Intn(spread)
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}
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func makeAddrs() (string, string, string) {
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start := randPort()
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return fmt.Sprintf("tcp://0.0.0.0:%d", start),
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fmt.Sprintf("tcp://0.0.0.0:%d", start+1),
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fmt.Sprintf("tcp://0.0.0.0:%d", start+2)
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}
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// getConfig returns a config for test cases
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func getConfig() *cfg.Config {
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pathname := makePathname()
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c := cfg.ResetTestRoot(pathname)
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// and we use random ports to run in parallel
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tm, rpc, grpc := makeAddrs()
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c.P2P.ListenAddress = tm
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c.RPC.ListenAddress = rpc
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c.RPC.GRPCListenAddress = grpc
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return c
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}
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// byteBufferWAL is a WAL which writes all msgs to a byte buffer. Writing stops
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// when the heightToStop is reached. Client will be notified via
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// signalWhenStopsTo channel.
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type byteBufferWAL struct {
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enc *WALEncoder
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stopped bool
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heightToStop int64
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signalWhenStopsTo chan struct{}
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}
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// needed for determinism
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var fixedTime, _ = time.Parse(time.RFC3339, "2017-01-02T15:04:05Z")
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// Save writes message to the internal buffer except when heightToStop is
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// reached, in which case it will signal the caller via signalWhenStopsTo and
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// skip writing.
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func (w *byteBufferWAL) Save(m WALMessage) {
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if w.stopped {
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return
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}
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if endMsg, ok := m.(EndHeightMessage); ok {
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if endMsg.Height == w.heightToStop {
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w.signalWhenStopsTo <- struct{}{}
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w.stopped = true
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return
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}
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}
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err := w.enc.Encode(&TimedWALMessage{fixedTime, m})
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if err != nil {
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panic(fmt.Sprintf("failed to encode the msg %v", m))
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}
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}
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func (w *byteBufferWAL) Group() *auto.Group {
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panic("not implemented")
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}
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func (w *byteBufferWAL) SearchForEndHeight(height int64) (gr *auto.GroupReader, found bool, err error) {
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return nil, false, nil
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}
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func (w *byteBufferWAL) Start() error { return nil }
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func (w *byteBufferWAL) Stop() error { return nil }
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func (w *byteBufferWAL) Wait() {}
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