github.com/leonlxy/hyperledger@v1.0.0-alpha.0.20170427033203-34922035d248/gossip/state/state_test.go

/*
Copyright IBM Corp. 2016 All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

                 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package state

import (
	"bytes"
	"errors"
	"fmt"
	"strconv"
	"sync"
	"testing"
	"time"

	pb "github.com/golang/protobuf/proto"
	"github.com/hyperledger/fabric/common/configtx/test"
	"github.com/hyperledger/fabric/common/util"
	"github.com/hyperledger/fabric/core/committer"
	"github.com/hyperledger/fabric/core/ledger/ledgermgmt"
	"github.com/hyperledger/fabric/core/mocks/validator"
	"github.com/hyperledger/fabric/gossip/api"
	"github.com/hyperledger/fabric/gossip/comm"
	"github.com/hyperledger/fabric/gossip/common"
	"github.com/hyperledger/fabric/gossip/gossip"
	"github.com/hyperledger/fabric/gossip/identity"
	"github.com/hyperledger/fabric/gossip/state/mocks"
	gutil "github.com/hyperledger/fabric/gossip/util"
	pcomm "github.com/hyperledger/fabric/protos/common"
	proto "github.com/hyperledger/fabric/protos/gossip"
	"github.com/spf13/viper"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/mock"
)

var (
	portPrefix = 5610
)

var orgID = []byte("ORG1")

type peerIdentityAcceptor func(identity api.PeerIdentityType) error

var noopPeerIdentityAcceptor = func(identity api.PeerIdentityType) error {
	return nil
}

type joinChanMsg struct {
}

func init() {
	gutil.SetupTestLogging()
}

// SequenceNumber returns the sequence number of the block that the message
// is derived from
func (*joinChanMsg) SequenceNumber() uint64 {
	return uint64(time.Now().UnixNano())
}

// Members returns the organizations of the channel
func (jcm *joinChanMsg) Members() []api.OrgIdentityType {
	return []api.OrgIdentityType{orgID}
}

// AnchorPeersOf returns the anchor peers of the given organization
func (jcm *joinChanMsg) AnchorPeersOf(org api.OrgIdentityType) []api.AnchorPeer {
	return []api.AnchorPeer{}
}

type orgCryptoService struct {
}

// OrgByPeerIdentity returns the OrgIdentityType
// of a given peer identity
func (*orgCryptoService) OrgByPeerIdentity(identity api.PeerIdentityType) api.OrgIdentityType {
	return orgID
}

// Verify verifies a JoinChannelMessage, returns nil on success,
// and an error on failure
func (*orgCryptoService) Verify(joinChanMsg api.JoinChannelMessage) error {
	return nil
}

type cryptoServiceMock struct {
	acceptor peerIdentityAcceptor
}

// GetPKIidOfCert returns the PKI-ID of a peer's identity
func (*cryptoServiceMock) GetPKIidOfCert(peerIdentity api.PeerIdentityType) common.PKIidType {
	return common.PKIidType(peerIdentity)
}

// VerifyBlock returns nil if the block is properly signed,
// else returns error
func (*cryptoServiceMock) VerifyBlock(chainID common.ChainID, signedBlock []byte) error {
	return nil
}

// Sign signs msg with this peer's signing key and outputs
// the signature if no error occurred.
func (*cryptoServiceMock) Sign(msg []byte) ([]byte, error) {
	clone := make([]byte, len(msg))
	copy(clone, msg)
	return clone, nil
}

// Verify checks that signature is a valid signature of message under a peer's verification key.
// If the verification succeeded, Verify returns nil meaning no error occurred.
// If peerCert is nil, then the signature is verified against this peer's verification key.
func (*cryptoServiceMock) Verify(peerIdentity api.PeerIdentityType, signature, message []byte) error {
	equal := bytes.Equal(signature, message)
	if !equal {
		return fmt.Errorf("Wrong signature:%v, %v", signature, message)
	}
	return nil
}

// VerifyByChannel checks that signature is a valid signature of message
// under a peer's verification key, but also in the context of a specific channel.
// If the verification succeeded, Verify returns nil meaning no error occurred.
// If peerIdentity is nil, then the signature is verified against this peer's verification key.
func (cs *cryptoServiceMock) VerifyByChannel(chainID common.ChainID, peerIdentity api.PeerIdentityType, signature, message []byte) error {
	return cs.acceptor(peerIdentity)
}

func (*cryptoServiceMock) ValidateIdentity(peerIdentity api.PeerIdentityType) error {
	return nil
}

func bootPeers(ids ...int) []string {
	peers := []string{}
	for _, id := range ids {
		peers = append(peers, fmt.Sprintf("localhost:%d", id+portPrefix))
	}
	return peers
}

// Simple presentation of peer which includes only
// communication module, gossip and state transfer
type peerNode struct {
	port   int
	g      gossip.Gossip
	s      GossipStateProvider
	cs     *cryptoServiceMock
	commit committer.Committer
}

// Shutting down all modules used
func (node *peerNode) shutdown() {
	node.s.Stop()
	node.g.Stop()
}

type mockCommitter struct {
	mock.Mock
}

func (mc *mockCommitter) Commit(block *pcomm.Block) error {
	mc.Called(block)
	return nil
}

func (mc *mockCommitter) LedgerHeight() (uint64, error) {
	if mc.Called().Get(1) == nil {
		return mc.Called().Get(0).(uint64), nil
	}
	return mc.Called().Get(0).(uint64), mc.Called().Get(1).(error)
}

func (mc *mockCommitter) GetBlocks(blockSeqs []uint64) []*pcomm.Block {
	if mc.Called(blockSeqs).Get(0) == nil {
		return nil
	}
	return mc.Called(blockSeqs).Get(0).([]*pcomm.Block)
}

func (*mockCommitter) Close() {
}

// Default configuration to be used for gossip and communication modules
func newGossipConfig(id int, boot ...int) *gossip.Config {
	port := id + portPrefix
	return &gossip.Config{
		BindPort:                   port,
		BootstrapPeers:             bootPeers(boot...),
		ID:                         fmt.Sprintf("p%d", id),
		MaxBlockCountToStore:       0,
		MaxPropagationBurstLatency: time.Duration(10) * time.Millisecond,
		MaxPropagationBurstSize:    10,
		PropagateIterations:        1,
		PropagatePeerNum:           3,
		PullInterval:               time.Duration(4) * time.Second,
		PullPeerNum:                5,
		InternalEndpoint:           fmt.Sprintf("localhost:%d", port),
		PublishCertPeriod:          10 * time.Second,
		RequestStateInfoInterval:   4 * time.Second,
		PublishStateInfoInterval:   4 * time.Second,
	}
}

// Create gossip instance
func newGossipInstance(config *gossip.Config, mcs api.MessageCryptoService) gossip.Gossip {
	idMapper := identity.NewIdentityMapper(mcs)

	return gossip.NewGossipServiceWithServer(config, &orgCryptoService{}, mcs, idMapper, []byte(config.InternalEndpoint))
}

// Create new instance of KVLedger to be used for testing
func newCommitter(id int) committer.Committer {
	cb, _ := test.MakeGenesisBlock(strconv.Itoa(id))
	ledger, _ := ledgermgmt.CreateLedger(cb)
	return committer.NewLedgerCommitter(ledger, &validator.MockValidator{})
}

// Constructing pseudo peer node, simulating only gossip and state transfer part
func newPeerNodeWithGossip(config *gossip.Config, committer committer.Committer, acceptor peerIdentityAcceptor, g gossip.Gossip) *peerNode {
	cs := &cryptoServiceMock{acceptor: acceptor}
	// Gossip component based on configuration provided and communication module
	if g == nil {
		g = newGossipInstance(config, &cryptoServiceMock{acceptor: noopPeerIdentityAcceptor})
	}

	logger.Debug("Joinning channel", util.GetTestChainID())
	g.JoinChan(&joinChanMsg{}, common.ChainID(util.GetTestChainID()))

	// Initialize pseudo peer simulator, which has only three
	// basic parts

	sp := NewGossipStateProvider(util.GetTestChainID(), g, committer, cs)
	if sp == nil {
		return nil
	}

	return &peerNode{
		port:   config.BindPort,
		g:      g,
		s:      sp,
		commit: committer,
		cs:     cs,
	}
}

// Constructing pseudo peer node, simulating only gossip and state transfer part
func newPeerNode(config *gossip.Config, committer committer.Committer, acceptor peerIdentityAcceptor) *peerNode {
	return newPeerNodeWithGossip(config, committer, acceptor, nil)
}

func TestNilDirectMsg(t *testing.T) {
	mc := &mockCommitter{}
	mc.On("LedgerHeight", mock.Anything).Return(uint64(1), nil)
	g := &mocks.GossipMock{}
	g.On("Accept", mock.Anything, false).Return(make(<-chan *proto.GossipMessage), nil)
	g.On("Accept", mock.Anything, true).Return(nil, make(<-chan proto.ReceivedMessage))
	p := newPeerNodeWithGossip(newGossipConfig(0), mc, noopPeerIdentityAcceptor, g)
	defer p.shutdown()
	p.s.(*GossipStateProviderImpl).handleStateRequest(nil)
	p.s.(*GossipStateProviderImpl).directMessage(nil)
	req := &comm.ReceivedMessageImpl{
		SignedGossipMessage: p.s.(*GossipStateProviderImpl).stateRequestMessage(uint64(10), uint64(8)).NoopSign(),
	}
	p.s.(*GossipStateProviderImpl).directMessage(req)
}

func TestFailures(t *testing.T) {
	mc := &mockCommitter{}
	mc.On("LedgerHeight", mock.Anything).Return(uint64(0), nil)
	g := &mocks.GossipMock{}
	g.On("Accept", mock.Anything, false).Return(make(<-chan *proto.GossipMessage), nil)
	g.On("Accept", mock.Anything, true).Return(nil, make(<-chan proto.ReceivedMessage))
	assert.Panics(t, func() {
		newPeerNodeWithGossip(newGossipConfig(0), mc, noopPeerIdentityAcceptor, g)
	})
	// Reprogram mock
	mc.Mock = mock.Mock{}
	mc.On("LedgerHeight", mock.Anything).Return(uint64(1), errors.New("Failed accessing ledger"))
	assert.Nil(t, newPeerNodeWithGossip(newGossipConfig(0), mc, noopPeerIdentityAcceptor, g))
	// Reprogram mock
	mc.Mock = mock.Mock{}
	mc.On("LedgerHeight", mock.Anything).Return(uint64(1), nil)
	mc.On("GetBlocks", mock.Anything).Return(nil)
	p := newPeerNodeWithGossip(newGossipConfig(0), mc, noopPeerIdentityAcceptor, g)
	assert.Nil(t, p.s.GetBlock(uint64(1)))
}

func TestGossipReception(t *testing.T) {
	signalChan := make(chan struct{})
	rawblock := &pcomm.Block{
		Header: &pcomm.BlockHeader{
			Number: uint64(1),
		},
		Data: &pcomm.BlockData{
			Data: [][]byte{},
		},
	}
	b, _ := pb.Marshal(rawblock)

	createChan := func(signalChan chan struct{}) <-chan *proto.GossipMessage {
		c := make(chan *proto.GossipMessage)
		gMsg := &proto.GossipMessage{
			Channel: []byte("AAA"),
			Content: &proto.GossipMessage_DataMsg{
				DataMsg: &proto.DataMessage{
					Payload: &proto.Payload{
						SeqNum: 1,
						Data:   b,
					},
				},
			},
		}
		go func(c chan *proto.GossipMessage) {
			// Wait for Accept() to be called
			<-signalChan
			// Simulate a message reception from the gossip component with an invalid channel
			c <- gMsg
			gMsg.Channel = []byte(util.GetTestChainID())
			// Simulate a message reception from the gossip component
			c <- gMsg
		}(c)
		return c
	}

	g := &mocks.GossipMock{}
	rmc := createChan(signalChan)
	g.On("Accept", mock.Anything, false).Return(rmc, nil).Run(func(_ mock.Arguments) {
		signalChan <- struct{}{}
	})
	g.On("Accept", mock.Anything, true).Return(nil, make(<-chan proto.ReceivedMessage))
	mc := &mockCommitter{}
	receivedChan := make(chan struct{})
	mc.On("Commit", mock.Anything).Run(func(arguments mock.Arguments) {
		block := arguments.Get(0).(*pcomm.Block)
		assert.Equal(t, uint64(1), block.Header.Number)
		receivedChan <- struct{}{}
	})
	mc.On("LedgerHeight", mock.Anything).Return(uint64(1), nil)
	p := newPeerNodeWithGossip(newGossipConfig(0), mc, noopPeerIdentityAcceptor, g)
	defer p.shutdown()
	select {
	case <-receivedChan:
	case <-time.After(time.Second * 15):
		assert.Fail(t, "Didn't commit a block within a timely manner")
	}
}

func TestAccessControl(t *testing.T) {
	viper.Set("peer.fileSystemPath", "/tmp/tests/ledger/node")
	ledgermgmt.InitializeTestEnv()
	defer ledgermgmt.CleanupTestEnv()

	bootstrapSetSize := 5
	bootstrapSet := make([]*peerNode, 0)

	authorizedPeers := map[string]struct{}{
		"localhost:5610": {},
		"localhost:5615": {},
		"localhost:5618": {},
		"localhost:5621": {},
	}

	blockPullPolicy := func(identity api.PeerIdentityType) error {
		if _, isAuthorized := authorizedPeers[string(identity)]; isAuthorized {
			return nil
		}
		return errors.New("Not authorized")
	}

	for i := 0; i < bootstrapSetSize; i++ {
		commit := newCommitter(i)
		bootstrapSet = append(bootstrapSet, newPeerNode(newGossipConfig(i), commit, blockPullPolicy))
	}

	defer func() {
		for _, p := range bootstrapSet {
			p.shutdown()
		}
	}()

	msgCount := 5

	for i := 1; i <= msgCount; i++ {
		rawblock := pcomm.NewBlock(uint64(i), []byte{})
		if b, err := pb.Marshal(rawblock); err == nil {
			payload := &proto.Payload{uint64(i), "", b}
			bootstrapSet[0].s.AddPayload(payload)
		} else {
			t.Fail()
		}
	}

	standardPeerSetSize := 10
	peersSet := make([]*peerNode, 0)

	for i := 0; i < standardPeerSetSize; i++ {
		commit := newCommitter(bootstrapSetSize + i)
		peersSet = append(peersSet, newPeerNode(newGossipConfig(bootstrapSetSize+i, 0, 1, 2, 3, 4), commit, blockPullPolicy))
	}

	defer func() {
		for _, p := range peersSet {
			p.shutdown()
		}
	}()

	waitUntilTrueOrTimeout(t, func() bool {
		for _, p := range peersSet {
			if len(p.g.PeersOfChannel(common.ChainID(util.GetTestChainID()))) != bootstrapSetSize+standardPeerSetSize-1 {
				logger.Debug("Peer discovery has not finished yet")
				return false
			}
		}
		logger.Debug("All peer discovered each other!!!")
		return true
	}, 30*time.Second)

	logger.Debug("Waiting for all blocks to arrive.")
	waitUntilTrueOrTimeout(t, func() bool {
		logger.Debug("Trying to see all authorized peers get all blocks, and all non-authorized didn't")
		for _, p := range peersSet {
			height, err := p.commit.LedgerHeight()
			id := fmt.Sprintf("localhost:%d", p.port)
			if _, isAuthorized := authorizedPeers[id]; isAuthorized {
				if height != uint64(msgCount+1) || err != nil {
					return false
				}
			} else {
				if err == nil && height > 1 {
					assert.Fail(t, "Peer", id, "got message but isn't authorized! Height:", height)
				}
			}
		}
		logger.Debug("All peers have same ledger height!!!")
		return true
	}, 60*time.Second)
}

/*// Simple scenario to start first booting node, gossip a message
// then start second node and verify second node also receives it
func TestNewGossipStateProvider_GossipingOneMessage(t *testing.T) {
	bootId := 0
	ledgerPath := "/tmp/tests/ledger/"
	defer os.RemoveAll(ledgerPath)

	bootNodeCommitter := newCommitter(bootId, ledgerPath + "node/")
	defer bootNodeCommitter.Close()

	bootNode := newPeerNode(newGossipConfig(bootId, 100), bootNodeCommitter)
	defer bootNode.shutdown()

	rawblock := &peer.Block2{}
	if err := pb.Unmarshal([]byte{}, rawblock); err != nil {
		t.Fail()
	}

	if bytes, err := pb.Marshal(rawblock); err == nil {
		payload := &proto.Payload{1, "", bytes}
		bootNode.s.AddPayload(payload)
	} else {
		t.Fail()
	}

	waitUntilTrueOrTimeout(t, func() bool {
		if block := bootNode.s.GetBlock(uint64(1)); block != nil {
			return true
		}
		return false
	}, 5 * time.Second)

	bootNode.g.Gossip(createDataMsg(uint64(1), []byte{}, ""))

	peerCommitter := newCommitter(1, ledgerPath + "node/")
	defer peerCommitter.Close()

	peer := newPeerNode(newGossipConfig(1, 100, bootId), peerCommitter)
	defer peer.shutdown()

	ready := make(chan interface{})

	go func(p *peerNode) {
		for len(p.g.GetPeers()) != 1 {
			time.Sleep(100 * time.Millisecond)
		}
		ready <- struct{}{}
	}(peer)

	select {
	case <-ready:
		{
			break
		}
	case <-time.After(1 * time.Second):
		{
			t.Fail()
		}
	}

	// Let sure anti-entropy will have a chance to bring missing block
	waitUntilTrueOrTimeout(t, func() bool {
		if block := peer.s.GetBlock(uint64(1)); block != nil {
			return true
		}
		return false
	}, 2 * defAntiEntropyInterval + 1 * time.Second)

	block := peer.s.GetBlock(uint64(1))

	assert.NotNil(t, block)
}

func TestNewGossipStateProvider_RepeatGossipingOneMessage(t *testing.T) {
	for i := 0; i < 10; i++ {
		TestNewGossipStateProvider_GossipingOneMessage(t)
	}
}*/

func TestNewGossipStateProvider_SendingManyMessages(t *testing.T) {
	viper.Set("peer.fileSystemPath", "/tmp/tests/ledger/node")
	ledgermgmt.InitializeTestEnv()
	defer ledgermgmt.CleanupTestEnv()

	bootstrapSetSize := 5
	bootstrapSet := make([]*peerNode, 0)

	for i := 0; i < bootstrapSetSize; i++ {
		commit := newCommitter(i)
		bootstrapSet = append(bootstrapSet, newPeerNode(newGossipConfig(i), commit, noopPeerIdentityAcceptor))
	}

	defer func() {
		for _, p := range bootstrapSet {
			p.shutdown()
		}
	}()

	msgCount := 10

	for i := 1; i <= msgCount; i++ {
		rawblock := pcomm.NewBlock(uint64(i), []byte{})
		if b, err := pb.Marshal(rawblock); err == nil {
			payload := &proto.Payload{uint64(i), "", b}
			bootstrapSet[0].s.AddPayload(payload)
		} else {
			t.Fail()
		}
	}

	standartPeersSize := 10
	peersSet := make([]*peerNode, 0)

	for i := 0; i < standartPeersSize; i++ {
		commit := newCommitter(bootstrapSetSize + i)
		peersSet = append(peersSet, newPeerNode(newGossipConfig(bootstrapSetSize+i, 0, 1, 2, 3, 4), commit, noopPeerIdentityAcceptor))
	}

	defer func() {
		for _, p := range peersSet {
			p.shutdown()
		}
	}()

	waitUntilTrueOrTimeout(t, func() bool {
		for _, p := range peersSet {
			if len(p.g.PeersOfChannel(common.ChainID(util.GetTestChainID()))) != bootstrapSetSize+standartPeersSize-1 {
				logger.Debug("Peer discovery has not finished yet")
				return false
			}
		}
		logger.Debug("All peer discovered each other!!!")
		return true
	}, 30*time.Second)

	logger.Debug("Waiting for all blocks to arrive.")
	waitUntilTrueOrTimeout(t, func() bool {
		logger.Debug("Trying to see all peers get all blocks")
		for _, p := range peersSet {
			height, err := p.commit.LedgerHeight()
			if height != uint64(msgCount+1) || err != nil {
				return false
			}
		}
		logger.Debug("All peers have same ledger height!!!")
		return true
	}, 60*time.Second)
}

func TestGossipStateProvider_TestStateMessages(t *testing.T) {
	viper.Set("peer.fileSystemPath", "/tmp/tests/ledger/node")
	ledgermgmt.InitializeTestEnv()
	defer ledgermgmt.CleanupTestEnv()

	bootPeer := newPeerNode(newGossipConfig(0), newCommitter(0), noopPeerIdentityAcceptor)
	defer bootPeer.shutdown()

	peer := newPeerNode(newGossipConfig(1, 0), newCommitter(1), noopPeerIdentityAcceptor)
	defer peer.shutdown()

	naiveStateMsgPredicate := func(message interface{}) bool {
		return message.(proto.ReceivedMessage).GetGossipMessage().IsRemoteStateMessage()
	}

	_, bootCh := bootPeer.g.Accept(naiveStateMsgPredicate, true)
	_, peerCh := peer.g.Accept(naiveStateMsgPredicate, true)

	wg := sync.WaitGroup{}
	wg.Add(2)

	go func() {
		msg := <-bootCh
		logger.Info("Bootstrap node got message, ", msg)
		assert.True(t, msg.GetGossipMessage().GetStateRequest() != nil)
		msg.Respond(&proto.GossipMessage{
			Content: &proto.GossipMessage_StateResponse{&proto.RemoteStateResponse{nil}},
		})
		wg.Done()
	}()

	go func() {
		msg := <-peerCh
		logger.Info("Peer node got an answer, ", msg)
		assert.True(t, msg.GetGossipMessage().GetStateResponse() != nil)
		wg.Done()

	}()

	readyCh := make(chan struct{})
	go func() {
		wg.Wait()
		readyCh <- struct{}{}
	}()

	time.Sleep(time.Duration(5) * time.Second)
	logger.Info("Sending gossip message with remote state request")

	chainID := common.ChainID(util.GetTestChainID())

	peer.g.Send(&proto.GossipMessage{
		Content: &proto.GossipMessage_StateRequest{&proto.RemoteStateRequest{0, 1}},
	}, &comm.RemotePeer{peer.g.PeersOfChannel(chainID)[0].Endpoint, peer.g.PeersOfChannel(chainID)[0].PKIid})
	logger.Info("Waiting until peers exchange messages")

	select {
	case <-readyCh:
		{
			logger.Info("Done!!!")

		}
	case <-time.After(time.Duration(10) * time.Second):
		{
			t.Fail()
		}
	}
}

// Start one bootstrap peer and submit defAntiEntropyBatchSize + 5 messages into
// local ledger, next spawning a new peer waiting for anti-entropy procedure to
// complete missing blocks. Since state transfer messages now batched, it is expected
// to see _exactly_ two messages with state transfer response.
func TestNewGossipStateProvider_BatchingOfStateRequest(t *testing.T) {
	viper.Set("peer.fileSystemPath", "/tmp/tests/ledger/node")
	ledgermgmt.InitializeTestEnv()
	defer ledgermgmt.CleanupTestEnv()

	bootPeer := newPeerNode(newGossipConfig(0), newCommitter(0), noopPeerIdentityAcceptor)
	defer bootPeer.shutdown()

	msgCount := defAntiEntropyBatchSize + 5
	expectedMessagesCnt := 2

	for i := 1; i <= msgCount; i++ {
		rawblock := pcomm.NewBlock(uint64(i), []byte{})
		if b, err := pb.Marshal(rawblock); err == nil {
			payload := &proto.Payload{uint64(i), "", b}
			bootPeer.s.AddPayload(payload)
		} else {
			t.Fail()
		}
	}

	peer := newPeerNode(newGossipConfig(1, 0), newCommitter(1), noopPeerIdentityAcceptor)
	defer peer.shutdown()

	naiveStateMsgPredicate := func(message interface{}) bool {
		return message.(proto.ReceivedMessage).GetGossipMessage().IsRemoteStateMessage()
	}
	_, peerCh := peer.g.Accept(naiveStateMsgPredicate, true)

	messageCh := make(chan struct{})
	stopWaiting := make(chan struct{})

	// Number of submitted messages is defAntiEntropyBatchSize + 5, therefore
	// expected number of batches is expectedMessagesCnt = 2. Following go routine
	// makes sure it receives expected amount of messages and sends signal of success
	// to continue the test
	go func(expected int) {
		cnt := 0
		for cnt < expected {
			select {
			case <-peerCh:
				{
					cnt++
				}

			case <-stopWaiting:
				{
					return
				}
			}
		}

		messageCh <- struct{}{}
	}(expectedMessagesCnt)

	// Waits for message which indicates that expected number of message batches received
	// otherwise timeouts after 2 * defAntiEntropyInterval + 1 seconds
	select {
	case <-messageCh:
		{
			// Once we got message which indicate of two batches being received,
			// making sure messages indeed committed.
			waitUntilTrueOrTimeout(t, func() bool {
				if len(peer.g.PeersOfChannel(common.ChainID(util.GetTestChainID()))) != 1 {
					logger.Debug("Peer discovery has not finished yet")
					return false
				}
				logger.Debug("All peer discovered each other!!!")
				return true
			}, 30*time.Second)

			logger.Debug("Waiting for all blocks to arrive.")
			waitUntilTrueOrTimeout(t, func() bool {
				logger.Debug("Trying to see all peers get all blocks")
				height, err := peer.commit.LedgerHeight()
				if height != uint64(msgCount+1) || err != nil {
					return false
				}
				logger.Debug("All peers have same ledger height!!!")
				return true
			}, 60*time.Second)
		}
	case <-time.After(defAntiEntropyInterval*2 + time.Second*1):
		{
			close(stopWaiting)
			t.Fatal("Expected to receive two batches with missing payloads")
		}
	}
}

func waitUntilTrueOrTimeout(t *testing.T, predicate func() bool, timeout time.Duration) {
	ch := make(chan struct{})
	go func() {
		logger.Debug("Started to spin off, until predicate will be satisfied.")
		for !predicate() {
			time.Sleep(1 * time.Second)
		}
		ch <- struct{}{}
		logger.Debug("Done.")
	}()

	select {
	case <-ch:
		break
	case <-time.After(timeout):
		t.Fatal("Timeout has expired")
		break
	}
	logger.Debug("Stop waiting until timeout or true")
}