package main

import (
	"fmt"
	"io/ioutil"
	"math/big"
	"math/rand"
	"net/http"
	_ "net/http/pprof"
	"os"
	"os/signal"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
	"syscall"
	"time"

	ethCommon "github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/log"
	"github.com/harmony-one/bls/ffi/go/bls"
	"github.com/harmony-one/harmony/api/service/syncing"
	"github.com/harmony-one/harmony/common/fdlimit"
	"github.com/harmony-one/harmony/common/ntp"
	"github.com/harmony-one/harmony/consensus"
	"github.com/harmony-one/harmony/consensus/quorum"
	"github.com/harmony-one/harmony/core"
	"github.com/harmony-one/harmony/internal/cli"
	"github.com/harmony-one/harmony/internal/common"
	nodeconfig "github.com/harmony-one/harmony/internal/configs/node"
	shardingconfig "github.com/harmony-one/harmony/internal/configs/sharding"
	"github.com/harmony-one/harmony/internal/genesis"
	"github.com/harmony-one/harmony/internal/shardchain"
	"github.com/harmony-one/harmony/internal/utils"
	"github.com/harmony-one/harmony/multibls"
	"github.com/harmony-one/harmony/node"
	"github.com/harmony-one/harmony/numeric"
	"github.com/harmony-one/harmony/p2p"
	"github.com/harmony-one/harmony/shard"
	"github.com/harmony-one/harmony/webhooks"
	"github.com/pkg/errors"
	"github.com/spf13/cobra"
)

// Host
var (
	myHost          p2p.Host
	initialAccounts = []*genesis.DeployAccount{}
)

var rootCmd = &cobra.Command{
	Use:   "harmony",
	Short: "harmony is the Harmony node binary file",
	Long: `harmony is the Harmony node binary file

Examples usage:

# start a validator node with default bls folder (default bls key files in ./.hmy/blskeys)
    ./harmony

# start a validator node with customized bls key folder
    ./harmony --bls.dir [bls_folder]

# start a validator node with open RPC endpoints and customized ports
    ./harmony --http.ip=0.0.0.0 --http.port=[http_port] --ws.ip=0.0.0.0 --ws.port=[ws_port]

# start an explorer node
    ./harmony --run=explorer --run.shard=[shard_id]

# start a harmony internal node on testnet
    ./harmony --run.legacy --network testnet
`,
	Run: runHarmonyNode,
}

var configFlag = cli.StringFlag{
	Name:      "config",
	Usage:     "load node config from the config toml file.",
	Shorthand: "c",
	DefValue:  "",
}

func init() {
	cli.SetParseErrorHandle(func(err error) {
		os.Exit(128) // 128 - invalid command line arguments
	})
	rootCmd.AddCommand(dumpConfigCmd)
	rootCmd.AddCommand(versionCmd)

	if err := registerRootCmdFlags(); err != nil {
		os.Exit(2)
	}
	if err := registerDumpConfigFlags(); err != nil {
		os.Exit(2)
	}
}

func main() {
	rootCmd.Execute()
}

func registerRootCmdFlags() error {
	flags := getRootFlags()

	return cli.RegisterFlags(rootCmd, flags)
}

func runHarmonyNode(cmd *cobra.Command, args []string) {
	if cli.GetBoolFlagValue(cmd, versionFlag) {
		printVersion()
		os.Exit(0)
	}

	if err := prepareRootCmd(cmd); err != nil {
		fmt.Fprint(os.Stderr, err)
		os.Exit(128)
	}
	cfg, err := getHarmonyConfig(cmd)
	if err != nil {
		fmt.Fprint(os.Stderr, err)
		cmd.Help()
		os.Exit(128)
	}

	setupNodeLog(cfg)
	setupPprof(cfg)
	setupNodeAndRun(cfg)
}

func prepareRootCmd(cmd *cobra.Command) error {
	// HACK Force usage of go implementation rather than the C based one. Do the right way, see the
	// notes one line 66,67 of https://golang.org/src/net/net.go that say can make the decision at
	// build time.
	os.Setenv("GODEBUG", "netdns=go")
	// Don't set higher than num of CPU. It will make go scheduler slower.
	runtime.GOMAXPROCS(runtime.NumCPU())
	// Set up randomization seed.
	rand.Seed(int64(time.Now().Nanosecond()))
	// Raise fd limits
	return raiseFdLimits()
}

func raiseFdLimits() error {
	limit, err := fdlimit.Maximum()
	if err != nil {
		return errors.Wrap(err, "Failed to retrieve file descriptor allowance")
	}
	_, err = fdlimit.Raise(uint64(limit))
	if err != nil {
		return errors.Wrap(err, "Failed to raise file descriptor allowance")
	}
	return nil
}

func getHarmonyConfig(cmd *cobra.Command) (harmonyConfig, error) {
	var (
		config harmonyConfig
		err    error
	)
	if cli.IsFlagChanged(cmd, configFlag) {
		configFile := cli.GetStringFlagValue(cmd, configFlag)
		config, err = loadHarmonyConfig(configFile)
	} else {
		nt := getNetworkType(cmd)
		config = getDefaultHmyConfigCopy(nt)
	}
	if err != nil {
		return harmonyConfig{}, err
	}
	if config.Version != defaultConfig.Version {
		fmt.Printf("Loaded config version %s which is not latest (%s).\n",
			config.Version, defaultConfig.Version)
		fmt.Println("Update saved config with `./harmony dumpconfig [config_file]`")
	}

	applyRootFlags(cmd, &config)

	if err := validateHarmonyConfig(config); err != nil {
		return harmonyConfig{}, err
	}

	return config, nil
}

func applyRootFlags(cmd *cobra.Command, config *harmonyConfig) {
	// Misc flags shall be applied first since legacy ip / port is overwritten
	// by new ip / port flags
	applyLegacyMiscFlags(cmd, config)
	applyGeneralFlags(cmd, config)
	applyNetworkFlags(cmd, config)
	applyP2PFlags(cmd, config)
	applyHTTPFlags(cmd, config)
	applyWSFlags(cmd, config)
	applyRPCOptFlags(cmd, config)
	applyBLSFlags(cmd, config)
	applyConsensusFlags(cmd, config)
	applyTxPoolFlags(cmd, config)
	applyPprofFlags(cmd, config)
	applyLogFlags(cmd, config)
	applySysFlags(cmd, config)
	applyDevnetFlags(cmd, config)
	applyRevertFlags(cmd, config)
}

func setupNodeLog(config harmonyConfig) {
	logPath := filepath.Join(config.Log.Folder, config.Log.FileName)
	rotateSize := config.Log.RotateSize
	verbosity := config.Log.Verbosity

	utils.AddLogFile(logPath, rotateSize)
	utils.SetLogVerbosity(log.Lvl(verbosity))
	if config.Log.Context != nil {
		ip := config.Log.Context.IP
		port := config.Log.Context.Port
		utils.SetLogContext(ip, strconv.Itoa(port))
	}
}

func setupPprof(config harmonyConfig) {
	enabled := config.Pprof.Enabled
	addr := config.Pprof.ListenAddr

	if enabled {
		go func() {
			http.ListenAndServe(addr, nil)
		}()
	}
}

func setupNodeAndRun(hc harmonyConfig) {
	var err error
	bootNodes := hc.Network.BootNodes
	p2p.BootNodes, err = p2p.StringsToAddrs(bootNodes)
	if err != nil {
		utils.FatalErrMsg(err, "cannot parse bootnode list %#v",
			bootNodes)
	}
	nodeconfigSetShardSchedule(hc)
	nodeconfig.SetShardingSchedule(shard.Schedule)
	nodeconfig.SetVersion(getHarmonyVersion())

	if hc.General.NodeType == "validator" {
		var err error
		if hc.General.NoStaking {
			err = setupLegacyNodeAccount(hc)
		} else {
			err = setupStakingNodeAccount(hc)
		}
		if err != nil {
			fmt.Fprintf(os.Stderr, "cannot set up node account: %s\n", err)
			os.Exit(1)
		}
	}
	if hc.General.NodeType == "validator" {
		fmt.Printf("%s mode; node key %s -> shard %d\n",
			map[bool]string{false: "Legacy", true: "Staking"}[!hc.General.NoStaking],
			nodeconfig.GetDefaultConfig().ConsensusPriKey.GetPublicKeys().SerializeToHexStr(),
			initialAccounts[0].ShardID)
	}
	if hc.General.NodeType != "validator" && hc.General.ShardID >= 0 {
		for _, initialAccount := range initialAccounts {
			utils.Logger().Info().
				Uint32("original", initialAccount.ShardID).
				Int("override", hc.General.ShardID).
				Msg("ShardID Override")
			initialAccount.ShardID = uint32(hc.General.ShardID)
		}
	}

	nodeConfig, err := createGlobalConfig(hc)
	if err != nil {
		fmt.Fprintf(os.Stderr, "ERROR cannot configure node: %s\n", err)
		os.Exit(1)
	}
	currentNode := setupConsensusAndNode(hc, nodeConfig)
	nodeconfig.GetDefaultConfig().ShardID = nodeConfig.ShardID
	nodeconfig.GetDefaultConfig().IsOffline = nodeConfig.IsOffline

	// Check NTP configuration
	accurate, err := ntp.CheckLocalTimeAccurate(nodeConfig.NtpServer)
	if !accurate {
		if os.IsTimeout(err) {
			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
			fmt.Fprintf(os.Stderr, "NTP query timed out. Continuing.\n")
		} else {
			fmt.Fprintf(os.Stderr, "Error: %v\n", err)
			fmt.Fprintf(os.Stderr, "Error: local timeclock is not accurate. Please config NTP properly.\n")
		}
	}
	if err != nil {
		utils.Logger().Warn().Err(err).Msg("Check Local Time Accuracy Error")
	}

	// Prepare for graceful shutdown from os signals
	osSignal := make(chan os.Signal)
	signal.Notify(osSignal, os.Interrupt, syscall.SIGTERM)
	go func() {
		for sig := range osSignal {
			if sig == syscall.SIGTERM || sig == os.Interrupt {
				const msg = "Got %s signal. Gracefully shutting down...\n"
				utils.Logger().Printf(msg, sig)
				fmt.Printf(msg, sig)
				currentNode.ShutDown()
			}
		}
	}()

	// Parse RPC config
	nodeConfig.RPCServer = nodeconfig.RPCServerConfig{
		HTTPEnabled:  hc.HTTP.Enabled,
		HTTPIp:       hc.HTTP.IP,
		HTTPPort:     hc.HTTP.Port,
		WSEnabled:    hc.WS.Enabled,
		WSIp:         hc.WS.IP,
		WSPort:       hc.WS.Port,
		DebugEnabled: hc.RPCOpt.DebugEnabled,
	}
	if nodeConfig.ShardID != shard.BeaconChainShardID {
		utils.Logger().Info().
			Uint32("shardID", currentNode.Blockchain().ShardID()).
			Uint32("shardID", nodeConfig.ShardID).Msg("SupportBeaconSyncing")
		currentNode.SupportBeaconSyncing()
	}

	// Parse rosetta config
	nodeConfig.RosettaServer = nodeconfig.RosettaServerConfig{
		HTTPEnabled: hc.HTTP.RosettaEnabled,
		HTTPIp:      hc.HTTP.IP,
		HTTPPort:    hc.HTTP.RosettaPort,
	}

	if hc.Revert != nil && hc.Revert.RevertBefore != 0 && hc.Revert.RevertTo != 0 {
		chain := currentNode.Blockchain()
		if hc.Revert.RevertBeacon {
			chain = currentNode.Beaconchain()
		}
		curNum := chain.CurrentBlock().NumberU64()
		if curNum < uint64(hc.Revert.RevertBefore) && curNum >= uint64(hc.Revert.RevertTo) {
			// Remove invalid blocks
			for chain.CurrentBlock().NumberU64() >= uint64(hc.Revert.RevertTo) {
				curBlock := chain.CurrentBlock()
				rollbacks := []ethCommon.Hash{curBlock.Hash()}
				if err := chain.Rollback(rollbacks); err != nil {
					fmt.Printf("Revert failed: %v\n", err)
					os.Exit(1)
				}
				lastSig := curBlock.Header().LastCommitSignature()
				sigAndBitMap := append(lastSig[:], curBlock.Header().LastCommitBitmap()...)
				chain.WriteCommitSig(curBlock.NumberU64()-1, sigAndBitMap)
			}
		}
	}

	startMsg := "==== New Harmony Node ===="
	if hc.General.NodeType == nodeTypeExplorer {
		startMsg = "==== New Explorer Node ===="
	}

	utils.Logger().Info().
		Str("BLSPubKey", nodeConfig.ConsensusPriKey.GetPublicKeys().SerializeToHexStr()).
		Uint32("ShardID", nodeConfig.ShardID).
		Str("ShardGroupID", nodeConfig.GetShardGroupID().String()).
		Str("BeaconGroupID", nodeConfig.GetBeaconGroupID().String()).
		Str("ClientGroupID", nodeConfig.GetClientGroupID().String()).
		Str("Role", currentNode.NodeConfig.Role().String()).
		Str("Version", getHarmonyVersion()).
		Str("multiaddress",
			fmt.Sprintf("/ip4/%s/tcp/%d/p2p/%s", hc.P2P.IP, hc.P2P.Port, myHost.GetID().Pretty()),
		).
		Msg(startMsg)

	nodeconfig.SetPeerID(myHost.GetID())

	currentNode.SupportSyncing()
	currentNode.ServiceManagerSetup()
	currentNode.RunServices()

	if err := currentNode.StartRPC(); err != nil {
		utils.Logger().Warn().
			Err(err).
			Msg("StartRPC failed")
	}

	if err := currentNode.StartRosetta(); err != nil {
		utils.Logger().Warn().
			Err(err).
			Msg("Start Rosetta failed")
	}

	if err := currentNode.BootstrapConsensus(); err != nil {
		fmt.Println("could not bootstrap consensus", err.Error())
		if !currentNode.NodeConfig.IsOffline {
			os.Exit(-1)
		}
	}

	if err := currentNode.Start(); err != nil {
		fmt.Println("could not begin network message handling for node", err.Error())
		os.Exit(-1)
	}
}

func nodeconfigSetShardSchedule(config harmonyConfig) {
	switch config.Network.NetworkType {
	case nodeconfig.Mainnet:
		shard.Schedule = shardingconfig.MainnetSchedule
	case nodeconfig.Testnet:
		shard.Schedule = shardingconfig.TestnetSchedule
	case nodeconfig.Pangaea:
		shard.Schedule = shardingconfig.PangaeaSchedule
	case nodeconfig.Localnet:
		shard.Schedule = shardingconfig.LocalnetSchedule
	case nodeconfig.Partner:
		shard.Schedule = shardingconfig.PartnerSchedule
	case nodeconfig.Stressnet:
		shard.Schedule = shardingconfig.StressNetSchedule
	case nodeconfig.Devnet:
		var dnConfig devnetConfig
		if config.Devnet != nil {
			dnConfig = *config.Devnet
		} else {
			dnConfig = getDefaultDevnetConfigCopy()
		}

		devnetConfig, err := shardingconfig.NewInstance(
			uint32(dnConfig.NumShards), dnConfig.ShardSize, dnConfig.HmyNodeSize, numeric.OneDec(), genesis.HarmonyAccounts, genesis.FoundationalNodeAccounts, nil, shardingconfig.VLBPE)
		if err != nil {
			_, _ = fmt.Fprintf(os.Stderr, "ERROR invalid devnet sharding config: %s",
				err)
			os.Exit(1)
		}
		shard.Schedule = shardingconfig.NewFixedSchedule(devnetConfig)
	}
}

func findAccountsByPubKeys(config shardingconfig.Instance, pubKeys multibls.PublicKeys) {
	for _, key := range pubKeys {
		keyStr := key.Bytes.Hex()
		_, account := config.FindAccount(keyStr)
		if account != nil {
			initialAccounts = append(initialAccounts, account)
		}
	}
}

func setupLegacyNodeAccount(hc harmonyConfig) error {
	genesisShardingConfig := shard.Schedule.InstanceForEpoch(big.NewInt(core.GenesisEpoch))
	multiBLSPubKey := setupConsensusKeys(hc, nodeconfig.GetDefaultConfig())

	reshardingEpoch := genesisShardingConfig.ReshardingEpoch()
	if len(reshardingEpoch) > 0 {
		for _, epoch := range reshardingEpoch {
			config := shard.Schedule.InstanceForEpoch(epoch)
			findAccountsByPubKeys(config, multiBLSPubKey)
			if len(initialAccounts) != 0 {
				break
			}
		}
	} else {
		findAccountsByPubKeys(genesisShardingConfig, multiBLSPubKey)
	}

	if len(initialAccounts) == 0 {
		fmt.Fprintf(
			os.Stderr,
			"ERROR cannot find your BLS key in the genesis/FN tables: %s\n",
			multiBLSPubKey.SerializeToHexStr(),
		)
		os.Exit(100)
	}

	for _, account := range initialAccounts {
		fmt.Printf("My Genesis Account: %v\n", *account)
	}
	return nil
}

func setupStakingNodeAccount(hc harmonyConfig) error {
	pubKeys := setupConsensusKeys(hc, nodeconfig.GetDefaultConfig())
	shardID, err := nodeconfig.GetDefaultConfig().ShardIDFromConsensusKey()
	if err != nil {
		return errors.Wrap(err, "cannot determine shard to join")
	}
	if err := nodeconfig.GetDefaultConfig().ValidateConsensusKeysForSameShard(
		pubKeys, shardID,
	); err != nil {
		return err
	}
	for _, blsKey := range pubKeys {
		initialAccount := &genesis.DeployAccount{}
		initialAccount.ShardID = shardID
		initialAccount.BLSPublicKey = blsKey.Bytes.Hex()
		initialAccount.Address = ""
		initialAccounts = append(initialAccounts, initialAccount)
	}
	return nil
}

func createGlobalConfig(hc harmonyConfig) (*nodeconfig.ConfigType, error) {
	var err error

	if len(initialAccounts) == 0 {
		initialAccounts = append(initialAccounts, &genesis.DeployAccount{ShardID: uint32(hc.General.ShardID)})
	}
	nodeConfig := nodeconfig.GetShardConfig(initialAccounts[0].ShardID)
	if hc.General.NodeType == nodeTypeValidator {
		// Set up consensus keys.
		setupConsensusKeys(hc, nodeConfig)
	} else {
		// set dummy bls key for consensus object
		nodeConfig.ConsensusPriKey = multibls.GetPrivateKeys(&bls.SecretKey{})
	}

	// Set network type
	netType := nodeconfig.NetworkType(hc.Network.NetworkType)
	nodeconfig.SetNetworkType(netType) // sets for both global and shard configs
	nodeConfig.SetArchival(hc.General.IsArchival)
	nodeConfig.IsOffline = hc.General.IsOffline

	// P2P private key is used for secure message transfer between p2p nodes.
	nodeConfig.P2PPriKey, _, err = utils.LoadKeyFromFile(hc.P2P.KeyFile)
	if err != nil {
		return nil, errors.Wrapf(err, "cannot load or create P2P key at %#v",
			hc.P2P.KeyFile)
	}

	selfPeer := p2p.Peer{
		IP:              hc.P2P.IP,
		Port:            strconv.Itoa(hc.P2P.Port),
		ConsensusPubKey: nodeConfig.ConsensusPriKey[0].Pub.Object,
	}

	myHost, err = p2p.NewHost(&selfPeer, nodeConfig.P2PPriKey)
	if err != nil {
		return nil, errors.Wrap(err, "cannot create P2P network host")
	}

	nodeConfig.DBDir = hc.General.DataDir

	if hc.Legacy != nil && hc.Legacy.WebHookConfig != nil && len(*hc.Legacy.WebHookConfig) != 0 {
		p := *hc.Legacy.WebHookConfig
		config, err := webhooks.NewWebHooksFromPath(p)
		if err != nil {
			fmt.Fprintf(
				os.Stderr, "yaml path is bad: %s", p,
			)
			os.Exit(1)
		}
		nodeConfig.WebHooks.Hooks = config
	}

	nodeConfig.NtpServer = hc.Sys.NtpServer

	return nodeConfig, nil
}

func setupConsensusAndNode(hc harmonyConfig, nodeConfig *nodeconfig.ConfigType) *node.Node {
	// Consensus object.
	// TODO: consensus object shouldn't start here
	decider := quorum.NewDecider(quorum.SuperMajorityVote, uint32(hc.General.ShardID))

	currentConsensus, err := consensus.New(
		myHost, nodeConfig.ShardID, p2p.Peer{}, nodeConfig.ConsensusPriKey, decider,
	)
	currentConsensus.Decider.SetMyPublicKeyProvider(func() (multibls.PublicKeys, error) {
		return currentConsensus.GetPublicKeys(), nil
	})

	if err != nil {
		_, _ = fmt.Fprintf(os.Stderr, "Error :%v \n", err)
		os.Exit(1)
	}

	currentConsensus.SetCommitDelay(time.Duration(0))

	// Parse minPeers from harmonyConfig
	var minPeers int
	if hc.Consensus != nil {
		minPeers = hc.Consensus.MinPeers
	} else {
		minPeers = defaultConsensusConfig.MinPeers
	}
	currentConsensus.MinPeers = minPeers

	blacklist, err := setupBlacklist(hc)
	if err != nil {
		utils.Logger().Warn().Msgf("Blacklist setup error: %s", err.Error())
	}

	// Current node.
	chainDBFactory := &shardchain.LDBFactory{RootDir: nodeConfig.DBDir}

	currentNode := node.New(myHost, currentConsensus, chainDBFactory, blacklist, hc.General.IsArchival)

	if hc.Legacy != nil && hc.Legacy.TPBroadcastInvalidTxn != nil {
		currentNode.BroadcastInvalidTx = *hc.Legacy.TPBroadcastInvalidTxn
	} else {
		currentNode.BroadcastInvalidTx = defaultBroadcastInvalidTx
	}

	// Syncing provider is provided by following rules:
	//   1. If starting with a localnet or offline, use local sync peers.
	//   2. If specified with --dns=false, use legacy syncing which is syncing through self-
	//      discover peers.
	//   3. Else, use the dns for syncing.
	if hc.Network.NetworkType == nodeconfig.Localnet || hc.General.IsOffline {
		epochConfig := shard.Schedule.InstanceForEpoch(ethCommon.Big0)
		selfPort := hc.P2P.Port
		currentNode.SyncingPeerProvider = node.NewLocalSyncingPeerProvider(
			6000, uint16(selfPort), epochConfig.NumShards(), uint32(epochConfig.NumNodesPerShard()))
	} else if hc.Network.LegacySyncing {
		currentNode.SyncingPeerProvider = node.NewLegacySyncingPeerProvider(currentNode)
	} else {
		currentNode.SyncingPeerProvider = node.NewDNSSyncingPeerProvider(hc.Network.DNSZone, syncing.GetSyncingPort(strconv.Itoa(hc.Network.DNSPort)))
	}

	// TODO: refactor the creation of blockchain out of node.New()
	currentConsensus.Blockchain = currentNode.Blockchain()
	currentNode.NodeConfig.DNSZone = hc.Network.DNSZone

	currentNode.NodeConfig.SetBeaconGroupID(
		nodeconfig.NewGroupIDByShardID(shard.BeaconChainShardID),
	)

	nodeconfig.GetDefaultConfig().DBDir = nodeConfig.DBDir
	switch hc.General.NodeType {
	case nodeTypeExplorer:
		nodeconfig.SetDefaultRole(nodeconfig.ExplorerNode)
		currentNode.NodeConfig.SetRole(nodeconfig.ExplorerNode)

	case nodeTypeValidator:
		nodeconfig.SetDefaultRole(nodeconfig.Validator)
		currentNode.NodeConfig.SetRole(nodeconfig.Validator)
	}
	currentNode.NodeConfig.SetShardGroupID(nodeconfig.NewGroupIDByShardID(nodeconfig.ShardID(nodeConfig.ShardID)))
	currentNode.NodeConfig.SetClientGroupID(nodeconfig.NewClientGroupIDByShardID(shard.BeaconChainShardID))
	currentNode.NodeConfig.ConsensusPriKey = nodeConfig.ConsensusPriKey

	// This needs to be executed after consensus setup
	if err := currentNode.InitConsensusWithValidators(); err != nil {
		utils.Logger().Warn().
			Int("shardID", hc.General.ShardID).
			Err(err).
			Msg("InitConsensusWithMembers failed")
	}

	// Set the consensus ID to be the current block number
	viewID := currentNode.Blockchain().CurrentBlock().Header().ViewID().Uint64()
	currentConsensus.SetViewIDs(viewID + 1)
	utils.Logger().Info().
		Uint64("viewID", viewID).
		Msg("Init Blockchain")

	// Assign closure functions to the consensus object
	currentConsensus.SetBlockVerifier(currentNode.VerifyNewBlock)
	currentConsensus.OnConsensusDone = currentNode.PostConsensusProcessing
	// update consensus information based on the blockchain
	currentConsensus.SetMode(currentConsensus.UpdateConsensusInformation())
	currentConsensus.NextBlockDue = time.Now()
	return currentNode
}

func setupBlacklist(hc harmonyConfig) (map[ethCommon.Address]struct{}, error) {
	utils.Logger().Debug().Msgf("Using blacklist file at `%s`", hc.TxPool.BlacklistFile)
	dat, err := ioutil.ReadFile(hc.TxPool.BlacklistFile)
	if err != nil {
		return nil, err
	}
	addrMap := make(map[ethCommon.Address]struct{})
	for _, line := range strings.Split(string(dat), "\n") {
		if len(line) != 0 { // blacklist file may have trailing empty string line
			b32 := strings.TrimSpace(strings.Split(string(line), "#")[0])
			addr, err := common.Bech32ToAddress(b32)
			if err != nil {
				return nil, err
			}
			addrMap[addr] = struct{}{}
		}
	}
	return addrMap, nil
}