cleanup

blockchain/reactor_test.go

@@ -1,6 +1,7 @@
 package blockchain
 
 import (
+	"fmt"
 	"os"
 	"sort"
 	"testing"
@@ -255,6 +256,95 @@ func TestBadBlockStopsPeer(t *testing.T) {
 	assert.True(t, lastReactorPair.reactor.Switch.Peers().Size() < len(reactorPairs)-1)
 }
 
+func setupReactors(
+	numReactors int, maxBlockHeight int64,
+	genDoc *types.GenesisDoc, privVals []types.PrivValidator) ([]BlockchainReactorPair, []*p2p.Switch) {
+
+	defer os.RemoveAll(config.RootDir)
+
+	reactorPairs := make([]BlockchainReactorPair, numReactors)
+
+	var logger = make([]log.Logger, numReactors)
+
+	for i := 0; i < numReactors; i++ {
+		logger[i] = log.TestingLogger()
+		height := int64(0)
+		if i == 0 {
+			height = maxBlockHeight
+		}
+		reactorPairs[i] = newBlockchainReactor(logger[i], genDoc, privVals, height)
+	}
+
+	switches := p2p.MakeConnectedSwitches(config.P2P, numReactors, func(i int, s *p2p.Switch) *p2p.Switch {
+		s.AddReactor("BLOCKCHAIN", reactorPairs[i].reactor)
+		return s
+
+	}, p2p.Connect2Switches)
+
+	for i := 0; i < numReactors; i++ {
+		addr := reactorPairs[i].reactor.Switch.NodeInfo().ID()
+		moduleName := fmt.Sprintf("blockchain-%v", addr)
+		reactorPairs[i].reactor.SetLogger(logger[i].With("module", moduleName[:19]))
+	}
+
+	return reactorPairs, switches
+}
+
+func TestFastSyncMultiNode(t *testing.T) {
+
+	numNodes := 8
+	maxHeight := int64(1000)
+	config = cfg.ResetTestRoot("blockchain_reactor_test")
+	genDoc, privVals := randGenesisDoc(1, false, 30)
+
+	reactorPairs, switches := setupReactors(numNodes, maxHeight, genDoc, privVals)
+
+	defer func() {
+		for _, r := range reactorPairs {
+			_ = r.reactor.Stop()
+			_ = r.app.Stop()
+		}
+	}()
+
+	for {
+		if reactorPairs[numNodes-1].reactor.pool.IsCaughtUp() || reactorPairs[numNodes-1].reactor.Switch.Peers().Size() == 0 {
+			break
+		}
+
+		time.Sleep(1 * time.Second)
+	}
+
+	//at this time, reactors[0-3] are the newest
+	assert.Equal(t, numNodes-1, reactorPairs[1].reactor.Switch.Peers().Size())
+
+	lastLogger := log.TestingLogger()
+	lastReactorPair := newBlockchainReactor(lastLogger, genDoc, privVals, 0)
+	reactorPairs = append(reactorPairs, lastReactorPair)
+
+	switches = append(switches, p2p.MakeConnectedSwitches(config.P2P, 1, func(i int, s *p2p.Switch) *p2p.Switch {
+		s.AddReactor("BLOCKCHAIN", reactorPairs[len(reactorPairs)-1].reactor)
+		return s
+
+	}, p2p.Connect2Switches)...)
+
+	addr := lastReactorPair.reactor.Switch.NodeInfo().ID()
+	moduleName := fmt.Sprintf("blockchain-%v", addr)
+	lastReactorPair.reactor.SetLogger(lastLogger.With("module", moduleName[:19]))
+
+	for i := 0; i < len(reactorPairs)-1; i++ {
+		p2p.Connect2Switches(switches, i, len(reactorPairs)-1)
+	}
+
+	for {
+		if lastReactorPair.reactor.pool.IsCaughtUp() || lastReactorPair.reactor.Switch.Peers().Size() == 0 {
+			break
+		}
+
+		time.Sleep(1 * time.Second)
+	}
+	assert.True(t, lastReactorPair.reactor.Switch.Peers().Size() < len(reactorPairs))
+}
+
 //----------------------------------------------
 // utility funcs
 

blockchain_new/peer.go

@@ -99,7 +99,7 @@ func (peer *bpPeer) onTimeout() {
 	peer.didTimeout = true
 }
 
-func (peer *bpPeer) isPeerGood() error {
+func (peer *bpPeer) isGood() error {
 	if peer.didTimeout {
 		return errNoPeerResponse
 	}

blockchain_new/peer_test.go

@@ -160,7 +160,7 @@ func TestCanBeRemovedDueToExpiration(t *testing.T) {
 	peer.incrPending()
 	time.Sleep(2 * time.Millisecond)
 	// timer expired, should be able to remove peer
-	assert.Equal(t, errNoPeerResponse, peer.isPeerGood())
+	assert.Equal(t, errNoPeerResponse, peer.isGood())
 }
 
 func TestCanBeRemovedDueToLowSpeed(t *testing.T) {
@@ -187,7 +187,7 @@ func TestCanBeRemovedDueToLowSpeed(t *testing.T) {
 	for i := 0; i < 10; i++ {
 		peer.decrPending(11)
 		time.Sleep(100 * time.Millisecond)
-		require.Nil(t, peer.isPeerGood())
+		require.Nil(t, peer.isGood())
 	}
 
 	// slow peer - send a bit less than 10 byes/100msec
@@ -196,7 +196,7 @@ func TestCanBeRemovedDueToLowSpeed(t *testing.T) {
 		time.Sleep(100 * time.Millisecond)
 	}
 	// check peer is considered slow
-	assert.Equal(t, errSlowPeer, peer.isPeerGood())
+	assert.Equal(t, errSlowPeer, peer.isGood())
 
 }
 

blockchain_new/reactor.go

@@ -3,13 +3,14 @@ package blockchain_new
 import (
 	"errors"
 	"fmt"
+	"reflect"
+	"time"
+
 	"github.com/tendermint/go-amino"
 	"github.com/tendermint/tendermint/libs/log"
 	"github.com/tendermint/tendermint/p2p"
 	sm "github.com/tendermint/tendermint/state"
 	"github.com/tendermint/tendermint/types"
-	"reflect"
-	"time"
 )
 
 const (
@@ -157,7 +158,7 @@ func (bcR *BlockchainReactor) respondToPeer(msg *bcBlockRequestMessage,
 		return src.TrySend(BlockchainChannel, msgBytes)
 	}
 
-	bcR.Logger.Info("Peer asking for a block we don't have", "src", src, "height", msg.Height)
+	bcR.Logger.Info("peer asking for a block we don't have", "src", src, "height", msg.Height)
 
 	msgBytes := cdc.MustMarshalBinaryBare(&bcNoBlockResponseMessage{Height: msg.Height})
 	return src.TrySend(BlockchainChannel, msgBytes)
@@ -167,13 +168,13 @@ func (bcR *BlockchainReactor) respondToPeer(msg *bcBlockRequestMessage,
 func (bcR *BlockchainReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte) {
 	msg, err := decodeMsg(msgBytes)
 	if err != nil {
-		bcR.Logger.Error("Error decoding message", "src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
+		bcR.Logger.Error("error decoding message", "src", src, "chId", chID, "msg", msg, "err", err, "bytes", msgBytes)
 		bcR.Switch.StopPeerForError(src, err)
 		return
 	}
 
 	if err = msg.ValidateBasic(); err != nil {
-		bcR.Logger.Error("Peer sent us invalid msg", "peer", src, "msg", msg, "err", err)
+		bcR.Logger.Error("peer sent us invalid msg", "peer", src, "msg", msg, "err", err)
 		bcR.Switch.StopPeerForError(src, err)
 		return
 	}
@@ -216,7 +217,7 @@ func (bcR *BlockchainReactor) Receive(chID byte, src p2p.Peer, msgBytes []byte)
 		sendMessageToFSM(bcR.fsm, msgData)
 
 	default:
-		bcR.Logger.Error(fmt.Sprintf("Unknown message type %v", reflect.TypeOf(msg)))
+		bcR.Logger.Error(fmt.Sprintf("unknown message type %v", reflect.TypeOf(msg)))
 	}
 }
 
@@ -235,7 +236,7 @@ func (bcR *BlockchainReactor) processBlocks(first *types.Block, second *types.Bl
 		chainID, firstID, first.Height, second.LastCommit)
 
 	if err != nil {
-		bcR.Logger.Error("Error in validation", "err", err, first.Height, second.Height)
+		bcR.Logger.Error("error in validation", "err", err, first.Height, second.Height)
 		peerID := bcR.fsm.blocks[first.Height].peerId
 		peer := bcR.Switch.Peers().Get(peerID)
 		if peer != nil {
@@ -255,7 +256,7 @@ func (bcR *BlockchainReactor) processBlocks(first *types.Block, second *types.Bl
 	bcR.state, err = bcR.blockExec.ApplyBlock(bcR.state, firstID, first)
 	if err != nil {
 		// TODO This is bad, are we zombie?
-		panic(fmt.Sprintf("Failed to process committed block (%d:%X): %v", first.Height, first.Hash(), err))
+		panic(fmt.Sprintf("failed to process committed block (%d:%X): %v", first.Height, first.Hash(), err))
 	}
 	bcR.blocksSynced++
 

blockchain_new/reactor_fsm.go

@@ -20,6 +20,17 @@ type blockData struct {
 	peerId p2p.ID
 }
 
+func (bd *blockData) String() string {
+	if bd == nil {
+		return fmt.Sprintf("blockData nil")
+	}
+	if bd.block == nil {
+		return fmt.Sprintf("block: nil peer: %v", bd.peerId)
+	}
+	return fmt.Sprintf("block: %v peer: %v", bd.block.Height, bd.peerId)
+
+}
+
 // Blockchain Reactor State
 type bReactorFSMState struct {
 	name string
@@ -46,7 +57,6 @@ type bReactorFSM struct {
 
 	blocks map[int64]*blockData
 	height int64 // processing height
-	lastRequestHeight int64
 
 	peers         map[p2p.ID]*bpPeer
 	maxPeerHeight int64
@@ -55,6 +65,7 @@ type bReactorFSM struct {
 
 	// channel to receive messages
 	messageCh           chan bReactorMessageData
+	processSignalActive bool
 
 	// interface used to send StatusRequest, BlockRequest, errors
 	bcr sendMessage
@@ -266,7 +277,7 @@ func init() {
 
 			case blockResponseEv:
 				// add block to fsm.blocks
-				fsm.logger.Info("blockResponseEv", "H", data.block.Height)
+				fsm.logger.Debug("blockResponseEv", "H", data.block.Height)
 				err := fsm.addBlock(data.peerId, data.block, data.length)
 				if err != nil {
 					// unsolicited, from different peer, already have it..
@@ -275,17 +286,15 @@ func init() {
 					return waitForBlock, err
 				}
 
-				if fsm.shouldTryProcessBlock() {
-					fsm.logger.Info("shouldTryProcessBlock", "first", fsm.height, "second", fsm.height+1)
-					// try to process block at fsm.height with the help of block at fsm.height+1
 				fsm.sendSignalToProcessBlock()
-				}
+
 				if fsm.state.timer != nil {
 					fsm.state.timer.Stop()
 				}
 				return waitForBlock, nil
 
 			case tryProcessBlockEv:
+				fsm.logger.Debug("FSM blocks", "blocks", fsm.blocks, "fsm_height", fsm.height)
 				if err := fsm.processBlock(); err != nil {
 					if err == errMissingBlocks {
 						// continue so we ask for more blocks
@@ -300,6 +309,7 @@ func init() {
 				} else {
 					delete(fsm.blocks, fsm.height)
 					fsm.height++
+					fsm.processSignalActive = false
 					fsm.removeShortPeers()
 
 					// processed block, check if we are done
@@ -316,11 +326,7 @@ func init() {
 					// wait for more peers or state timeout
 				}
 
-				if fsm.shouldTryProcessBlock() {
-					fsm.logger.Info("shouldTryProcessBlock", "first", fsm.height, "second", fsm.height+1)
-					// try to process block at fsm.height with the help of block at fsm.height+1
 				fsm.sendSignalToProcessBlock()
-				}
 
 				if fsm.state.timer != nil {
 					fsm.state.timer.Stop()
@@ -378,7 +384,7 @@ func NewFSM(store *BlockStore, bcr sendMessage) *bReactorFSM {
 }
 
 func sendMessageToFSM(fsm *bReactorFSM, msg bReactorMessageData) {
-	fsm.logger.Info("send message to FSM", "msg", msg.String())
+	fsm.logger.Debug("send message to FSM", "msg", msg.String())
 	fsm.messageCh <- msg
 }
 
@@ -409,7 +415,7 @@ forLoop:
 	for {
 		select {
 		case msg := <-fsm.messageCh:
-			fsm.logger.Info("FSM Received message", "msg", msg.String())
+			fsm.logger.Debug("FSM Received message", "msg", msg.String())
 			_ = fsm.handle(&msg)
 			if msg.event == stopFSMEv {
 				break forLoop
@@ -423,18 +429,21 @@ forLoop:
 
 // handle processes messages and events sent to the FSM.
 func (fsm *bReactorFSM) handle(msg *bReactorMessageData) error {
-	fsm.logger.Info("Blockchain reactor FSM received event", "event", msg.event, "state", fsm.state.name)
+	fsm.logger.Debug("FSM received event", "event", msg.event, "state", fsm.state.name)
 
 	if fsm.state == nil {
 		fsm.state = unknown
 	}
 	next, err := fsm.state.handle(fsm, msg.event, msg.data)
 	if err != nil {
-		fsm.logger.Error("Blockchain reactor event handler returned", "err", err)
+		fsm.logger.Error("FSM event handler returned", "err", err, "state", fsm.state.name, "event", msg.event)
 	}
 
+	oldState := fsm.state.name
 	fsm.transition(next)
-	fsm.logger.Info("FSM new state", "state", fsm.state.name)
+	if oldState != fsm.state.name {
+		fsm.logger.Info("FSM changed state", "old_state", oldState, "event", msg.event, "new_state", fsm.state.name)
+	}
 	return err
 }
 
@@ -442,7 +451,7 @@ func (fsm *bReactorFSM) transition(next *bReactorFSMState) {
 	if next == nil {
 		return
 	}
-	fsm.logger.Info("Blockchain reactor FSM changes state: ", "old", fsm.state.name, "new", next.name)
+	fsm.logger.Debug("changes state: ", "old", fsm.state.name, "new", next.name)
 
 	if fsm.state != next {
 		fsm.state = next
@@ -490,7 +499,7 @@ func (fsm *bReactorFSM) resetStateTimer(state *bReactorFSMState) {
 func (fsm *bReactorFSM) sendRequestBatch() error {
 	// remove slow and timed out peers
 	for _, peer := range fsm.peers {
-		if err := peer.isPeerGood(); err != nil {
+		if err := peer.isGood(); err != nil {
 			fsm.logger.Info("Removing bad peer", "peer", peer.id, "err", err)
 			fsm.removePeer(peer.id, err)
 		}
@@ -502,6 +511,7 @@ func (fsm *bReactorFSM) sendRequestBatch() error {
 		// request height
 		height := fsm.height + int64(i)
 		if height > fsm.maxPeerHeight {
+			fsm.logger.Debug("Will not send request for", "height", height)
 			return err
 		}
 		req := fsm.blocks[height]
@@ -520,20 +530,27 @@ func (fsm *bReactorFSM) sendRequestBatch() error {
 func (fsm *bReactorFSM) sendRequest(height int64) error {
 	// make requests
 	// TODO - sort peers in order of goodness
+	fsm.logger.Debug("try to send request for", "height", height)
 	for _, peer := range fsm.peers {
 		// Send Block Request message to peer
-		fsm.logger.Info("Try to send request to peer", "peer", peer.id, "height", height)
+		if peer.height < height {
+			continue
+		}
+		fsm.logger.Debug("Try to send request to peer", "peer", peer.id, "height", height)
 		err := fsm.bcr.sendBlockRequest(peer.id, height)
 		if err == errSendQueueFull {
-			fsm.logger.Info("cannot send request, queue full", "peer", peer.id, "height", height)
+			fsm.logger.Error("cannot send request, queue full", "peer", peer.id, "height", height)
 			continue
 		}
 		if err == errNilPeerForBlockRequest {
 			// this peer does not exist in the switch, delete locally
-			fsm.logger.Info("Peer doesn't exist in the switch", "peer", peer.id)
+			fsm.logger.Error("peer doesn't exist in the switch", "peer", peer.id)
 			fsm.deletePeer(peer.id)
 			continue
 		}
+
+		fsm.logger.Debug("Sent request to peer", "peer", peer.id, "height", height)
+
 		// reserve space for block
 		fsm.blocks[height] = &blockData{peerId: peer.id, block: nil}
 		fsm.peers[peer.id].incrPending()
@@ -616,7 +633,7 @@ func (fsm *bReactorFSM) removeShortPeers() {
 
 // removes any blocks and requests associated with the peer, deletes the peer and informs the switch if needed.
 func (fsm *bReactorFSM) removePeer(peerID p2p.ID, err error) {
-	fsm.logger.Info("removePeer", "peer", peerID, "err", err)
+	fsm.logger.Debug("removePeer", "peer", peerID, "err", err)
 	// remove all data for blocks waiting for the peer or not processed yet
 	for h, bData := range fsm.blocks {
 		if bData.peerId == peerID {
@@ -664,7 +681,7 @@ func (fsm *bReactorFSM) addBlock(peerID p2p.ID, block *types.Block, blockSize in
 		return errBadDataFromPeer
 	}
 	if blockData.block != nil {
-		fsm.logger.Error("already have a block for height")
+		fsm.logger.Error("already have a block for height", "height", block.Height)
 		return errBadDataFromPeer
 	}
 
@@ -676,25 +693,27 @@ func (fsm *bReactorFSM) addBlock(peerID p2p.ID, block *types.Block, blockSize in
 	return nil
 }
 
-func (fsm *bReactorFSM) shouldTryProcessBlock() bool {
+func (fsm *bReactorFSM) sendSignalToProcessBlock() {
 	first := fsm.blocks[fsm.height]
 	second := fsm.blocks[fsm.height+1]
 	if first == nil || first.block == nil || second == nil || second.block == nil {
 		// We need both to sync the first block.
-		return false
+		fsm.logger.Debug("No need to send signal to process, blocks missing")
-	}
+		return
-	return true
 	}
 
-func (fsm *bReactorFSM) sendSignalToProcessBlock() {
+	fsm.logger.Debug("Send signal to process", "first", fsm.height, "second", fsm.height+1)
-	// TODO - add check that this was sent before, currently there are extraneous tryProcessBlockEv
+	if fsm.processSignalActive {
-	fsm.logger.Info("Send signal to process", "first", fsm.height, "second", fsm.height+1)
+		fsm.logger.Debug("..already sent")
+		return
+	}
 
 	msgData := bReactorMessageData{
 		event: tryProcessBlockEv,
 		data:  bReactorEventData{},
 	}
 	sendMessageToFSM(fsm, msgData)
+	fsm.processSignalActive = true
 }
 
 // Processes block at height H = fsm.height. Expects both H and H+1 to be available
@@ -703,13 +722,14 @@ func (fsm *bReactorFSM) processBlock() error {
 	second := fsm.blocks[fsm.height+1]
 	if first == nil || first.block == nil || second == nil || second.block == nil {
 		// We need both to sync the first block.
+		fsm.logger.Debug("process blocks doesn't have the blocks", "first", first, "second", second)
 		return errMissingBlocks
 	}
-	fsm.logger.Info("process blocks", "first", first.block.Height, "second", second.block.Height)
+	fsm.logger.Debug("process blocks", "first", first.block.Height, "second", second.block.Height)
-	fsm.logger.Info("FSM blocks", "blocks", fsm.blocks)
+	fsm.logger.Debug("FSM blocks", "blocks", fsm.blocks)
 
 	if err := fsm.bcr.processBlocks(first.block, second.block); err != nil {
-		fsm.logger.Error("Process blocks returned error", "err", err, "first", first.block.Height, "second", second.block.Height)
+		fsm.logger.Error("process blocks returned error", "err", err, "first", first.block.Height, "second", second.block.Height)
 		fsm.logger.Error("FSM blocks", "blocks", fsm.blocks)
 		return err
 	}

blockchain_new/reactor_fsm_test.go

@@ -64,6 +64,16 @@ type fsmStepTestValues struct {
 	expectedLastBlockReq *lastBlockRequestT
 }
 
+func newTestReactor() *testReactor {
+	logger := log.TestingLogger()
+	blockDB := dbm.NewMemDB()
+	store := NewBlockStore(blockDB)
+	testBcR := &testReactor{logger: logger}
+	testBcR.fsm = NewFSM(store, testBcR)
+	testBcR.fsm.setLogger(logger)
+	return testBcR
+}
+
 // WIP
 func TestFSMTransitionSequences(t *testing.T) {
 	maxRequestBatchSize = 2
@@ -79,27 +89,19 @@ func TestFSMTransitionSequences(t *testing.T) {
 	}
 
 	for _, tt := range fsmTransitionSequenceTests {
-		// Create and start the FSM
+		// Create test reactor
-		testBcR := &testReactor{logger: log.TestingLogger()}
+		testBcR := newTestReactor()
-		blockDB := dbm.NewMemDB()
-		store := NewBlockStore(blockDB)
-		fsm := NewFSM(store, testBcR)
-		fsm.setLogger(log.TestingLogger())
 		resetTestValues()
 
-		// always start from unknown
-		fsm.resetStateTimer(unknown)
-		assert.Equal(t, 1, stateTimerStarts[unknown.name])
-
 		for _, step := range tt {
-			assert.Equal(t, step.currentState, fsm.state.name)
+			assert.Equal(t, step.currentState, testBcR.fsm.state.name)
 			failSendStatusRequest = step.failStatusReq
 			failSendBlockRequest = step.failBlockReq
 
 			oldNumStatusRequests := numStatusRequests
 			oldNumBlockRequests := numBlockRequests
 
-			_ = sendEventToFSM(fsm, step.event, step.data)
+			_ = sendEventToFSM(testBcR.fsm, step.event, step.data)
 			if step.shouldSendStatusReq {
 				assert.Equal(t, oldNumStatusRequests+1, numStatusRequests)
 			} else {
@@ -112,7 +114,7 @@ func TestFSMTransitionSequences(t *testing.T) {
 				assert.Equal(t, oldNumBlockRequests, numBlockRequests)
 			}
 
-			assert.Equal(t, step.expectedState, fsm.state.name)
+			assert.Equal(t, step.expectedState, testBcR.fsm.state.name)
 		}
 	}
 }
@@ -120,13 +122,10 @@ func TestFSMTransitionSequences(t *testing.T) {
 func TestReactorFSMBasic(t *testing.T) {
 	maxRequestBatchSize = 2
 
+	// Create test reactor
+	testBcR := newTestReactor()
 	resetTestValues()
-	// Create and start the FSM
+	fsm := testBcR.fsm
-	testBcR := &testReactor{logger: log.TestingLogger()}
-	blockDB := dbm.NewMemDB()
-	store := NewBlockStore(blockDB)
-	fsm := NewFSM(store, testBcR)
-	fsm.setLogger(log.TestingLogger())
 
 	if err := fsm.handle(&bReactorMessageData{event: startFSMEv}); err != nil {
 	}
@@ -151,11 +150,8 @@ func TestReactorFSMPeerTimeout(t *testing.T) {
 	resetTestValues()
 	peerTimeout = 20 * time.Millisecond
 	// Create and start the FSM
-	testBcR := &testReactor{logger: log.TestingLogger()}
+	testBcR := newTestReactor()
-	blockDB := dbm.NewMemDB()
+	fsm := testBcR.fsm
-	store := NewBlockStore(blockDB)
-	fsm := NewFSM(store, testBcR)
-	fsm.setLogger(log.TestingLogger())
 	fsm.start()
 
 	// Check that FSM sends a status request message

blockchain_new/reactor_test.go

@@ -290,6 +290,100 @@ func TestBadBlockStopsPeer(t *testing.T) {
 	assert.True(t, lastReactorPair.reactor.Switch.Peers().Size() < len(reactorPairs)-1)
 }
 
+func setupReactors(
+	numReactors int, maxBlockHeight int64,
+	genDoc *types.GenesisDoc, privVals []types.PrivValidator) ([]BlockchainReactorPair, []*p2p.Switch) {
+
+	defer os.RemoveAll(config.RootDir)
+
+	reactorPairs := make([]BlockchainReactorPair, numReactors)
+
+	var logger = make([]log.Logger, numReactors)
+
+	for i := 0; i < numReactors; i++ {
+		logger[i] = log.TestingLogger()
+		height := int64(0)
+		if i == 0 {
+			height = maxBlockHeight
+		}
+		reactorPairs[i] = newBlockchainReactor(logger[i], genDoc, privVals, height)
+	}
+
+	switches := p2p.MakeConnectedSwitches(config.P2P, numReactors, func(i int, s *p2p.Switch) *p2p.Switch {
+		s.AddReactor("BLOCKCHAIN", reactorPairs[i].reactor)
+		return s
+
+	}, p2p.Connect2Switches)
+
+	for i := 0; i < numReactors; i++ {
+		addr := reactorPairs[i].reactor.Switch.NodeInfo().ID()
+		moduleName := fmt.Sprintf("blockchain-%v", addr)
+		reactorPairs[i].reactor.SetLogger(logger[i].With("module", moduleName[:19]))
+	}
+
+	return reactorPairs, switches
+}
+
+func TestFastSyncMultiNode(t *testing.T) {
+
+	numNodes := 8
+	maxHeight := int64(1000)
+	peerTimeout = 15 * time.Second
+	maxRequestBatchSize = 40
+
+	config = cfg.ResetTestRoot("blockchain_reactor_test")
+	genDoc, privVals := randGenesisDoc(1, false, 30)
+
+	reactorPairs, switches := setupReactors(numNodes, maxHeight, genDoc, privVals)
+
+	defer func() {
+		for _, r := range reactorPairs {
+			_ = r.reactor.Stop()
+			_ = r.app.Stop()
+		}
+	}()
+
+	for {
+		if reactorPairs[numNodes-1].reactor.fsm.IsFinished() || reactorPairs[3].reactor.Switch.Peers().Size() == 0 {
+			break
+		}
+
+		time.Sleep(1 * time.Second)
+	}
+
+	//at this time, reactors[0-3] are the newest
+	assert.Equal(t, numNodes-1, reactorPairs[1].reactor.Switch.Peers().Size())
+
+	lastLogger := log.TestingLogger()
+	lastReactorPair := newBlockchainReactor(lastLogger, genDoc, privVals, 0)
+	reactorPairs = append(reactorPairs, lastReactorPair)
+
+	switches = append(switches, p2p.MakeConnectedSwitches(config.P2P, 1, func(i int, s *p2p.Switch) *p2p.Switch {
+		s.AddReactor("BLOCKCHAIN", reactorPairs[len(reactorPairs)-1].reactor)
+		return s
+
+	}, p2p.Connect2Switches)...)
+
+	addr := lastReactorPair.reactor.Switch.NodeInfo().ID()
+	moduleName := fmt.Sprintf("blockchain-%v", addr)
+	lastReactorPair.reactor.SetLogger(lastLogger.With("module", moduleName[:19]))
+
+	for i := 0; i < len(reactorPairs)-1; i++ {
+		p2p.Connect2Switches(switches, i, len(reactorPairs)-1)
+	}
+
+	for {
+		if lastReactorPair.reactor.fsm.IsFinished() || lastReactorPair.reactor.Switch.Peers().Size() == 0 {
+			break
+		}
+
+		time.Sleep(1 * time.Second)
+	}
+
+	assert.True(t, lastReactorPair.reactor.Switch.Peers().Size() < len(reactorPairs))
+	assert.Equal(t, lastReactorPair.reactor.fsm.maxPeerHeight, lastReactorPair.reactor.fsm.height)
+}
+
 //----------------------------------------------
 // utility funcs
 

libs/log/testing_logger.go

@@ -30,10 +30,6 @@ func TestingLogger() Logger {
 // inside a test (not in the init func) because
 // verbose flag only set at the time of testing.
 func TestingLoggerWithOutput(w io.Writer) Logger {
-	if _testingLogger != nil {
-		return _testingLogger
-	}
-
 	if testing.Verbose() {
 		_testingLogger = NewTMLogger(NewSyncWriter(w))
 	} else {