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testConsensusNode.go
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testConsensusNode.go
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package integrationTests
import (
"fmt"
"math/big"
"time"
"github.com/multiversx/mx-chain-core-go/core"
"github.com/multiversx/mx-chain-core-go/core/check"
"github.com/multiversx/mx-chain-core-go/core/pubkeyConverter"
"github.com/multiversx/mx-chain-core-go/data"
dataBlock "github.com/multiversx/mx-chain-core-go/data/block"
"github.com/multiversx/mx-chain-core-go/data/endProcess"
"github.com/multiversx/mx-chain-core-go/hashing"
"github.com/multiversx/mx-chain-core-go/hashing/blake2b"
crypto "github.com/multiversx/mx-chain-crypto-go"
mclMultiSig "github.com/multiversx/mx-chain-crypto-go/signing/mcl/multisig"
"github.com/multiversx/mx-chain-crypto-go/signing/multisig"
"github.com/multiversx/mx-chain-go/config"
"github.com/multiversx/mx-chain-go/consensus/round"
"github.com/multiversx/mx-chain-go/dataRetriever"
"github.com/multiversx/mx-chain-go/epochStart/metachain"
"github.com/multiversx/mx-chain-go/epochStart/notifier"
cryptoFactory "github.com/multiversx/mx-chain-go/factory/crypto"
"github.com/multiversx/mx-chain-go/factory/peerSignatureHandler"
"github.com/multiversx/mx-chain-go/integrationTests/mock"
"github.com/multiversx/mx-chain-go/keysManagement"
"github.com/multiversx/mx-chain-go/node"
"github.com/multiversx/mx-chain-go/ntp"
"github.com/multiversx/mx-chain-go/p2p"
p2pFactory "github.com/multiversx/mx-chain-go/p2p/factory"
"github.com/multiversx/mx-chain-go/process/factory"
syncFork "github.com/multiversx/mx-chain-go/process/sync"
"github.com/multiversx/mx-chain-go/sharding"
chainShardingMocks "github.com/multiversx/mx-chain-go/sharding/mock"
"github.com/multiversx/mx-chain-go/sharding/nodesCoordinator"
"github.com/multiversx/mx-chain-go/state"
"github.com/multiversx/mx-chain-go/storage"
"github.com/multiversx/mx-chain-go/storage/cache"
"github.com/multiversx/mx-chain-go/storage/storageunit"
"github.com/multiversx/mx-chain-go/testscommon"
"github.com/multiversx/mx-chain-go/testscommon/cryptoMocks"
dataRetrieverMock "github.com/multiversx/mx-chain-go/testscommon/dataRetriever"
"github.com/multiversx/mx-chain-go/testscommon/enableEpochsHandlerMock"
testFactory "github.com/multiversx/mx-chain-go/testscommon/factory"
"github.com/multiversx/mx-chain-go/testscommon/genesisMocks"
"github.com/multiversx/mx-chain-go/testscommon/nodeTypeProviderMock"
"github.com/multiversx/mx-chain-go/testscommon/p2pmocks"
"github.com/multiversx/mx-chain-go/testscommon/shardingMocks"
stateMock "github.com/multiversx/mx-chain-go/testscommon/state"
statusHandlerMock "github.com/multiversx/mx-chain-go/testscommon/statusHandler"
vic "github.com/multiversx/mx-chain-go/testscommon/validatorInfoCacher"
)
const (
blsConsensusType = "bls"
signatureSize = 48
publicKeySize = 96
maxShards = 1
)
var testPubkeyConverter, _ = pubkeyConverter.NewHexPubkeyConverter(32)
// ArgsTestConsensusNode represents the arguments for the test consensus node constructor(s)
type ArgsTestConsensusNode struct {
ShardID uint32
ConsensusSize int
RoundTime uint64
ConsensusType string
NodeKeys *TestNodeKeys
EligibleMap map[uint32][]nodesCoordinator.Validator
WaitingMap map[uint32][]nodesCoordinator.Validator
KeyGen crypto.KeyGenerator
P2PKeyGen crypto.KeyGenerator
MultiSigner *cryptoMocks.MultisignerMock
StartTime int64
}
// TestConsensusNode represents a structure used in integration tests used for consensus tests
type TestConsensusNode struct {
Node *node.Node
MainMessenger p2p.Messenger
FullArchiveMessenger p2p.Messenger
NodesCoordinator nodesCoordinator.NodesCoordinator
ShardCoordinator sharding.Coordinator
ChainHandler data.ChainHandler
BlockProcessor *mock.BlockProcessorMock
RequestersFinder dataRetriever.RequestersFinder
AccountsDB *state.AccountsDB
NodeKeys *TestKeyPair
MultiSigner *cryptoMocks.MultisignerMock
}
// NewTestConsensusNode returns a new TestConsensusNode
func NewTestConsensusNode(args ArgsTestConsensusNode) *TestConsensusNode {
shardCoordinator, _ := sharding.NewMultiShardCoordinator(maxShards, args.ShardID)
tcn := &TestConsensusNode{
NodeKeys: args.NodeKeys.MainKey,
ShardCoordinator: shardCoordinator,
MultiSigner: args.MultiSigner,
}
tcn.initNode(args)
return tcn
}
// CreateNodesWithTestConsensusNode returns a map with nodes per shard each using TestConsensusNode
func CreateNodesWithTestConsensusNode(
numMetaNodes int,
nodesPerShard int,
consensusSize int,
roundTime uint64,
consensusType string,
numKeysOnEachNode int,
) map[uint32][]*TestConsensusNode {
nodes := make(map[uint32][]*TestConsensusNode, nodesPerShard)
cp := CreateCryptoParams(nodesPerShard, numMetaNodes, maxShards, numKeysOnEachNode)
keysMap := PubKeysMapFromNodesKeysMap(cp.NodesKeys)
validatorsMap := GenValidatorsFromPubKeys(keysMap, maxShards)
eligibleMap, _ := nodesCoordinator.NodesInfoToValidators(validatorsMap)
waitingMap := make(map[uint32][]nodesCoordinator.Validator)
connectableNodes := make(map[uint32][]Connectable, 0)
startTime := time.Now().Unix()
testHasher := createHasher(consensusType)
for shardID := range cp.NodesKeys {
for _, keysPair := range cp.NodesKeys[shardID] {
multiSigner, _ := multisig.NewBLSMultisig(&mclMultiSig.BlsMultiSigner{Hasher: testHasher}, cp.KeyGen)
multiSignerMock := createCustomMultiSignerMock(multiSigner)
args := ArgsTestConsensusNode{
ShardID: shardID,
ConsensusSize: consensusSize,
RoundTime: roundTime,
ConsensusType: consensusType,
NodeKeys: keysPair,
EligibleMap: eligibleMap,
WaitingMap: waitingMap,
KeyGen: cp.KeyGen,
P2PKeyGen: cp.P2PKeyGen,
MultiSigner: multiSignerMock,
StartTime: startTime,
}
tcn := NewTestConsensusNode(args)
nodes[shardID] = append(nodes[shardID], tcn)
connectableNodes[shardID] = append(connectableNodes[shardID], tcn)
}
}
for shardID := range nodes {
ConnectNodes(connectableNodes[shardID])
}
return nodes
}
func createCustomMultiSignerMock(multiSigner crypto.MultiSigner) *cryptoMocks.MultisignerMock {
multiSignerMock := &cryptoMocks.MultisignerMock{}
multiSignerMock.CreateSignatureShareCalled = func(privateKeyBytes, message []byte) ([]byte, error) {
return multiSigner.CreateSignatureShare(privateKeyBytes, message)
}
multiSignerMock.VerifySignatureShareCalled = func(publicKey, message, sig []byte) error {
return multiSigner.VerifySignatureShare(publicKey, message, sig)
}
multiSignerMock.AggregateSigsCalled = func(pubKeysSigners, signatures [][]byte) ([]byte, error) {
return multiSigner.AggregateSigs(pubKeysSigners, signatures)
}
multiSignerMock.VerifyAggregatedSigCalled = func(pubKeysSigners [][]byte, message, aggSig []byte) error {
return multiSigner.VerifyAggregatedSig(pubKeysSigners, message, aggSig)
}
return multiSignerMock
}
func (tcn *TestConsensusNode) initNode(args ArgsTestConsensusNode) {
testHasher := createHasher(args.ConsensusType)
epochStartRegistrationHandler := notifier.NewEpochStartSubscriptionHandler()
consensusCache, _ := cache.NewLRUCache(10000)
pkBytes, _ := tcn.NodeKeys.Pk.ToByteArray()
tcn.initNodesCoordinator(args.ConsensusSize, testHasher, epochStartRegistrationHandler, args.EligibleMap, args.WaitingMap, pkBytes, consensusCache)
tcn.MainMessenger = CreateMessengerWithNoDiscovery()
tcn.FullArchiveMessenger = &p2pmocks.MessengerStub{}
tcn.initBlockChain(testHasher)
tcn.initBlockProcessor()
syncer := ntp.NewSyncTime(ntp.NewNTPGoogleConfig(), nil)
syncer.StartSyncingTime()
roundHandler, _ := round.NewRound(
time.Unix(args.StartTime, 0),
syncer.CurrentTime(),
time.Millisecond*time.Duration(args.RoundTime),
syncer,
0)
dataPool := dataRetrieverMock.CreatePoolsHolder(1, 0)
argsNewMetaEpochStart := &metachain.ArgsNewMetaEpochStartTrigger{
GenesisTime: time.Unix(args.StartTime, 0),
EpochStartNotifier: notifier.NewEpochStartSubscriptionHandler(),
Settings: &config.EpochStartConfig{
MinRoundsBetweenEpochs: 1,
RoundsPerEpoch: 1000,
},
Epoch: 0,
Storage: createTestStore(),
Marshalizer: TestMarshalizer,
Hasher: testHasher,
AppStatusHandler: &statusHandlerMock.AppStatusHandlerStub{},
DataPool: dataPool,
}
epochStartTrigger, _ := metachain.NewEpochStartTrigger(argsNewMetaEpochStart)
forkDetector, _ := syncFork.NewShardForkDetector(
roundHandler,
cache.NewTimeCache(time.Second),
&mock.BlockTrackerStub{},
args.StartTime,
)
tcn.initRequestersFinder()
peerSigCache, _ := storageunit.NewCache(storageunit.CacheConfig{Type: storageunit.LRUCache, Capacity: 1000})
peerSigHandler, _ := peerSignatureHandler.NewPeerSignatureHandler(peerSigCache, TestSingleBlsSigner, args.KeyGen)
multiSigContainer := cryptoMocks.NewMultiSignerContainerMock(tcn.MultiSigner)
privKey := tcn.NodeKeys.Sk
pubKey := tcn.NodeKeys.Sk.GeneratePublic()
tcn.initAccountsDB()
coreComponents := GetDefaultCoreComponents(CreateEnableEpochsConfig())
coreComponents.SyncTimerField = syncer
coreComponents.RoundHandlerField = roundHandler
coreComponents.InternalMarshalizerField = TestMarshalizer
coreComponents.HasherField = testHasher
coreComponents.AddressPubKeyConverterField = testPubkeyConverter
coreComponents.ChainIdCalled = func() string {
return string(ChainID)
}
coreComponents.GenesisTimeField = time.Unix(args.StartTime, 0)
coreComponents.GenesisNodesSetupField = &genesisMocks.NodesSetupStub{
GetShardConsensusGroupSizeCalled: func() uint32 {
return uint32(args.ConsensusSize)
},
GetMetaConsensusGroupSizeCalled: func() uint32 {
return uint32(args.ConsensusSize)
},
}
argsKeysHolder := keysManagement.ArgsManagedPeersHolder{
KeyGenerator: args.KeyGen,
P2PKeyGenerator: args.P2PKeyGen,
MaxRoundsOfInactivity: 0,
PrefsConfig: config.Preferences{},
P2PKeyConverter: p2pFactory.NewP2PKeyConverter(),
}
keysHolder, _ := keysManagement.NewManagedPeersHolder(argsKeysHolder)
// adding provided handled keys
for _, key := range args.NodeKeys.HandledKeys {
skBytes, _ := key.Sk.ToByteArray()
_ = keysHolder.AddManagedPeer(skBytes)
}
pubKeyBytes, _ := pubKey.ToByteArray()
pubKeyString := coreComponents.ValidatorPubKeyConverterField.SilentEncode(pubKeyBytes, log)
argsKeysHandler := keysManagement.ArgsKeysHandler{
ManagedPeersHolder: keysHolder,
PrivateKey: tcn.NodeKeys.Sk,
Pid: tcn.MainMessenger.ID(),
}
keysHandler, _ := keysManagement.NewKeysHandler(argsKeysHandler)
signingHandlerArgs := cryptoFactory.ArgsSigningHandler{
PubKeys: []string{pubKeyString},
MultiSignerContainer: multiSigContainer,
KeyGenerator: args.KeyGen,
KeysHandler: keysHandler,
SingleSigner: TestSingleBlsSigner,
}
sigHandler, _ := cryptoFactory.NewSigningHandler(signingHandlerArgs)
networkComponents := GetDefaultNetworkComponents()
networkComponents.Messenger = tcn.MainMessenger
networkComponents.InputAntiFlood = &mock.NilAntifloodHandler{}
networkComponents.PeerHonesty = &mock.PeerHonestyHandlerStub{}
cryptoComponents := GetDefaultCryptoComponents()
cryptoComponents.PrivKey = privKey
cryptoComponents.PubKey = pubKey
cryptoComponents.BlockSig = TestSingleBlsSigner
cryptoComponents.TxSig = TestSingleSigner
cryptoComponents.MultiSigContainer = multiSigContainer
cryptoComponents.BlKeyGen = args.KeyGen
cryptoComponents.PeerSignHandler = peerSigHandler
cryptoComponents.SigHandler = sigHandler
cryptoComponents.KeysHandlerField = keysHandler
processComponents := GetDefaultProcessComponents()
processComponents.ForkDetect = forkDetector
processComponents.ShardCoord = tcn.ShardCoordinator
processComponents.NodesCoord = tcn.NodesCoordinator
processComponents.BlockProcess = tcn.BlockProcessor
processComponents.ReqFinder = tcn.RequestersFinder
processComponents.EpochTrigger = epochStartTrigger
processComponents.EpochNotifier = epochStartRegistrationHandler
processComponents.BlackListHdl = &testscommon.TimeCacheStub{}
processComponents.BootSore = &mock.BoostrapStorerMock{}
processComponents.HeaderSigVerif = &mock.HeaderSigVerifierStub{}
processComponents.HeaderIntegrVerif = &mock.HeaderIntegrityVerifierStub{}
processComponents.ReqHandler = &testscommon.RequestHandlerStub{}
processComponents.MainPeerMapper = mock.NewNetworkShardingCollectorMock()
processComponents.FullArchivePeerMapper = mock.NewNetworkShardingCollectorMock()
processComponents.RoundHandlerField = roundHandler
processComponents.ScheduledTxsExecutionHandlerInternal = &testscommon.ScheduledTxsExecutionStub{}
processComponents.ProcessedMiniBlocksTrackerInternal = &testscommon.ProcessedMiniBlocksTrackerStub{}
processComponents.SentSignaturesTrackerInternal = &testscommon.SentSignatureTrackerStub{}
dataComponents := GetDefaultDataComponents()
dataComponents.BlockChain = tcn.ChainHandler
dataComponents.DataPool = dataPool
dataComponents.Store = createTestStore()
stateComponents := GetDefaultStateComponents()
stateComponents.Accounts = tcn.AccountsDB
stateComponents.AccountsAPI = tcn.AccountsDB
statusCoreComponents := &testFactory.StatusCoreComponentsStub{
AppStatusHandlerField: &statusHandlerMock.AppStatusHandlerStub{},
}
var err error
tcn.Node, err = node.NewNode(
node.WithCoreComponents(coreComponents),
node.WithStatusCoreComponents(statusCoreComponents),
node.WithCryptoComponents(cryptoComponents),
node.WithProcessComponents(processComponents),
node.WithDataComponents(dataComponents),
node.WithStateComponents(stateComponents),
node.WithNetworkComponents(networkComponents),
node.WithRoundDuration(args.RoundTime),
node.WithConsensusGroupSize(args.ConsensusSize),
node.WithConsensusType(args.ConsensusType),
node.WithGenesisTime(time.Unix(args.StartTime, 0)),
node.WithValidatorSignatureSize(signatureSize),
node.WithPublicKeySize(publicKeySize),
)
if err != nil {
fmt.Println(err.Error())
}
}
func (tcn *TestConsensusNode) initNodesCoordinator(
consensusSize int,
hasher hashing.Hasher,
epochStartRegistrationHandler notifier.EpochStartNotifier,
eligibleMap map[uint32][]nodesCoordinator.Validator,
waitingMap map[uint32][]nodesCoordinator.Validator,
pkBytes []byte,
cache storage.Cacher,
) {
argumentsNodesCoordinator := nodesCoordinator.ArgNodesCoordinator{
ShardConsensusGroupSize: consensusSize,
MetaConsensusGroupSize: consensusSize,
Marshalizer: TestMarshalizer,
Hasher: hasher,
Shuffler: &shardingMocks.NodeShufflerMock{},
EpochStartNotifier: epochStartRegistrationHandler,
BootStorer: CreateMemUnit(),
NbShards: maxShards,
EligibleNodes: eligibleMap,
WaitingNodes: waitingMap,
SelfPublicKey: pkBytes,
ConsensusGroupCache: cache,
ShuffledOutHandler: &chainShardingMocks.ShuffledOutHandlerStub{},
ChanStopNode: endProcess.GetDummyEndProcessChannel(),
NodeTypeProvider: &nodeTypeProviderMock.NodeTypeProviderStub{},
IsFullArchive: false,
EnableEpochsHandler: &enableEpochsHandlerMock.EnableEpochsHandlerStub{},
ValidatorInfoCacher: &vic.ValidatorInfoCacherStub{},
ShardIDAsObserver: tcn.ShardCoordinator.SelfId(),
GenesisNodesSetupHandler: &genesisMocks.NodesSetupStub{},
NodesCoordinatorRegistryFactory: &shardingMocks.NodesCoordinatorRegistryFactoryMock{},
}
tcn.NodesCoordinator, _ = nodesCoordinator.NewIndexHashedNodesCoordinator(argumentsNodesCoordinator)
}
func (tcn *TestConsensusNode) initBlockChain(hasher hashing.Hasher) {
if tcn.ShardCoordinator.SelfId() == core.MetachainShardId {
tcn.ChainHandler = CreateMetaChain()
} else {
tcn.ChainHandler = CreateShardChain()
}
rootHash := []byte("roothash")
header := &dataBlock.Header{
Nonce: 0,
ShardID: tcn.ShardCoordinator.SelfId(),
BlockBodyType: dataBlock.StateBlock,
Signature: rootHash,
RootHash: rootHash,
PrevRandSeed: rootHash,
RandSeed: rootHash,
}
metaHeader := &dataBlock.MetaBlock{
Nonce: 0,
Signature: rootHash,
RootHash: rootHash,
PrevRandSeed: rootHash,
RandSeed: rootHash,
}
if tcn.ShardCoordinator.SelfId() == core.MetachainShardId {
_ = tcn.ChainHandler.SetGenesisHeader(metaHeader)
} else {
_ = tcn.ChainHandler.SetGenesisHeader(header)
}
hdrMarshalized, _ := TestMarshalizer.Marshal(header)
tcn.ChainHandler.SetGenesisHeaderHash(hasher.Compute(string(hdrMarshalized)))
}
func (tcn *TestConsensusNode) initBlockProcessor() {
tcn.BlockProcessor = &mock.BlockProcessorMock{
Marshalizer: TestMarshalizer,
CommitBlockCalled: func(header data.HeaderHandler, body data.BodyHandler) error {
tcn.BlockProcessor.NumCommitBlockCalled++
headerHash, _ := core.CalculateHash(TestMarshalizer, TestHasher, header)
tcn.ChainHandler.SetCurrentBlockHeaderHash(headerHash)
_ = tcn.ChainHandler.SetCurrentBlockHeaderAndRootHash(header, header.GetRootHash())
return nil
},
CreateBlockCalled: func(header data.HeaderHandler, haveTime func() bool) (data.HeaderHandler, data.BodyHandler, error) {
_ = header.SetAccumulatedFees(big.NewInt(0))
_ = header.SetDeveloperFees(big.NewInt(0))
_ = header.SetRootHash([]byte("roothash"))
return header, &dataBlock.Body{}, nil
},
MarshalizedDataToBroadcastCalled: func(header data.HeaderHandler, body data.BodyHandler) (map[uint32][]byte, map[string][][]byte, error) {
mrsData := make(map[uint32][]byte)
mrsTxs := make(map[string][][]byte)
return mrsData, mrsTxs, nil
},
CreateNewHeaderCalled: func(round uint64, nonce uint64) (data.HeaderHandler, error) {
return &dataBlock.Header{
Round: round,
Nonce: nonce,
SoftwareVersion: []byte("version"),
}, nil
},
}
}
func (tcn *TestConsensusNode) initRequestersFinder() {
hdrRequester := &dataRetrieverMock.HeaderRequesterStub{}
mbRequester := &dataRetrieverMock.HashSliceRequesterStub{}
tcn.RequestersFinder = &dataRetrieverMock.RequestersFinderStub{
IntraShardRequesterCalled: func(baseTopic string) (resolver dataRetriever.Requester, e error) {
if baseTopic == factory.MiniBlocksTopic {
return mbRequester, nil
}
return nil, nil
},
CrossShardRequesterCalled: func(baseTopic string, crossShard uint32) (resolver dataRetriever.Requester, err error) {
if baseTopic == factory.ShardBlocksTopic {
return hdrRequester, nil
}
return nil, nil
},
}
}
func (tcn *TestConsensusNode) initAccountsDB() {
storer, _, err := stateMock.CreateTestingTriePruningStorer(tcn.ShardCoordinator, notifier.NewEpochStartSubscriptionHandler())
if err != nil {
log.Error("initAccountsDB", "error", err.Error())
}
trieStorage, _ := CreateTrieStorageManager(storer)
tcn.AccountsDB, _ = CreateAccountsDB(UserAccount, trieStorage)
}
func createHasher(consensusType string) hashing.Hasher {
if consensusType == blsConsensusType {
hasher, _ := blake2b.NewBlake2bWithSize(mclMultiSig.HasherOutputSize)
return hasher
}
return blake2b.NewBlake2b()
}
func createTestStore() dataRetriever.StorageService {
store := dataRetriever.NewChainStorer()
store.AddStorer(dataRetriever.TransactionUnit, CreateMemUnit())
store.AddStorer(dataRetriever.MiniBlockUnit, CreateMemUnit())
store.AddStorer(dataRetriever.RewardTransactionUnit, CreateMemUnit())
store.AddStorer(dataRetriever.MetaBlockUnit, CreateMemUnit())
store.AddStorer(dataRetriever.PeerChangesUnit, CreateMemUnit())
store.AddStorer(dataRetriever.BlockHeaderUnit, CreateMemUnit())
store.AddStorer(dataRetriever.BootstrapUnit, CreateMemUnit())
store.AddStorer(dataRetriever.ReceiptsUnit, CreateMemUnit())
store.AddStorer(dataRetriever.ScheduledSCRsUnit, CreateMemUnit())
store.AddStorer(dataRetriever.ShardHdrNonceHashDataUnit, CreateMemUnit())
store.AddStorer(dataRetriever.MetaHdrNonceHashDataUnit, CreateMemUnit())
return store
}
// ConnectOnMain will try to initiate a connection to the provided parameter on the main messenger
func (tcn *TestConsensusNode) ConnectOnMain(connectable Connectable) error {
if check.IfNil(connectable) {
return fmt.Errorf("trying to connect to a nil Connectable parameter")
}
return tcn.MainMessenger.ConnectToPeer(connectable.GetMainConnectableAddress())
}
// ConnectOnFullArchive will try to initiate a connection to the provided parameter on the full archive messenger
func (tcn *TestConsensusNode) ConnectOnFullArchive(connectable Connectable) error {
if check.IfNil(connectable) {
return fmt.Errorf("trying to connect to a nil Connectable parameter")
}
return tcn.FullArchiveMessenger.ConnectToPeer(connectable.GetMainConnectableAddress())
}
// GetMainConnectableAddress returns a non circuit, non windows default connectable p2p address
func (tcn *TestConsensusNode) GetMainConnectableAddress() string {
if tcn == nil {
return "nil"
}
return GetConnectableAddress(tcn.MainMessenger)
}
// GetFullArchiveConnectableAddress returns a non circuit, non windows default connectable p2p address of the full archive network
func (tcn *TestConsensusNode) GetFullArchiveConnectableAddress() string {
if tcn == nil {
return "nil"
}
return GetConnectableAddress(tcn.FullArchiveMessenger)
}
// IsInterfaceNil returns true if there is no value under the interface
func (tcn *TestConsensusNode) IsInterfaceNil() bool {
return tcn == nil
}