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