From 957ebaa960bef4d92db1ac77c47299f07e8a2a6e Mon Sep 17 00:00:00 2001
From: devintegral2 <devintegral2@sfxdx.ru>
Date: Tue, 21 May 2019 15:38:45 +0700
Subject: [PATCH 1/5] Setup logger level. Replace panic -> log.Fatal

---
 cmd/dummy/commands/root.go         | 24 ++++--------------------
 cmd/dummy_client/main.go           | 26 ++++----------------------
 cmd/lachesis/commands/run.go       | 10 ++++++----
 cmd/network/commands/run.go        |  6 ++++--
 src/lachesis/lachesis_config.go    | 22 ++--------------------
 src/poslachesis/config.go          |  2 ++
 src/poslachesis/lachesis.go        |  4 ++--
 src/posnode/emitter.go             |  2 +-
 src/posnode/gossip.go              | 10 +++++-----
 src/posnode/gossip_test.go         |  2 +-
 src/posnode/log.go                 |  6 +++++-
 src/posnode/node.go                |  4 ++--
 src/posnode/node_test.go           |  2 +-
 src/posnode/store.go               | 24 ++++++++++++------------
 src/posposet/common_test.go        |  2 +-
 src/posposet/flag_table.go         |  3 +--
 src/posposet/frame.go              |  4 +---
 src/posposet/frames.go             |  2 +-
 src/posposet/input.go              |  2 +-
 src/posposet/poset.go              | 11 +++++++++--
 src/posposet/poset_atropos_test.go |  2 +-
 src/posposet/state.go              |  4 ++--
 src/posposet/store.go              | 18 +++++++++---------
 src/posposet/store_test.go         |  2 +-
 src/utils/util.go                  | 23 +++++++++++++++++++++++
 25 files changed, 101 insertions(+), 116 deletions(-)

diff --git a/cmd/dummy/commands/root.go b/cmd/dummy/commands/root.go
index 911400155..fec9b24dd 100644
--- a/cmd/dummy/commands/root.go
+++ b/cmd/dummy/commands/root.go
@@ -6,11 +6,13 @@ import (
 	"io/ioutil"
 	"os"
 
-	"github.com/Fantom-foundation/go-lachesis/src/dummy"
 	"github.com/rifflock/lfshook"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
+
+	"github.com/Fantom-foundation/go-lachesis/src/dummy"
+	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 var (
@@ -73,7 +75,7 @@ func loadConfig(cmd *cobra.Command, args []string) error {
 		return err
 	}
 	logger = newLogger()
-	logger.Level = logLevel(config.LogLevel)
+	logger.Level = utils.GetLogLevel(config.LogLevel)
 	logger.WithFields(logrus.Fields{
 		"name":          config.Name,
 		"client-listen": config.ClientAddr,
@@ -117,21 +119,3 @@ func newLogger() *logrus.Logger {
 	))
 	return logger
 }
-func logLevel(l string) logrus.Level {
-	switch l {
-	case "debug":
-		return logrus.DebugLevel
-	case "info":
-		return logrus.InfoLevel
-	case "warn":
-		return logrus.WarnLevel
-	case "error":
-		return logrus.ErrorLevel
-	case "fatal":
-		return logrus.FatalLevel
-	case "panic":
-		return logrus.PanicLevel
-	default:
-		return logrus.DebugLevel
-	}
-}
diff --git a/cmd/dummy_client/main.go b/cmd/dummy_client/main.go
index 32d86acba..5fc129f32 100644
--- a/cmd/dummy_client/main.go
+++ b/cmd/dummy_client/main.go
@@ -5,12 +5,13 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-
+	
 	"github.com/rifflock/lfshook"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
-
+	
 	"github.com/Fantom-foundation/go-lachesis/src/dummy"
+	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 var (
@@ -57,7 +58,7 @@ func main() {
 
 func run(c *cli.Context) error {
 	logger := newLogger()
-	logger.Level = logLevel(c.String(LogLevelFlag.Name))
+	logger.Level = utils.GetLogLevel(c.String(LogLevelFlag.Name))
 
 	name := c.String(NameFlag.Name)
 	address := c.String(ProxyAddressFlag.Name)
@@ -111,22 +112,3 @@ func newLogger() *logrus.Logger {
 	))
 	return logger
 }
-
-func logLevel(l string) logrus.Level {
-	switch l {
-	case "debug":
-		return logrus.DebugLevel
-	case "info":
-		return logrus.InfoLevel
-	case "warn":
-		return logrus.WarnLevel
-	case "error":
-		return logrus.ErrorLevel
-	case "fatal":
-		return logrus.FatalLevel
-	case "panic":
-		return logrus.PanicLevel
-	default:
-		return logrus.DebugLevel
-	}
-}
diff --git a/cmd/lachesis/commands/run.go b/cmd/lachesis/commands/run.go
index c88ca82cb..cbf19d4c9 100644
--- a/cmd/lachesis/commands/run.go
+++ b/cmd/lachesis/commands/run.go
@@ -7,14 +7,16 @@ import (
 	"runtime"
 	"time"
 
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+
 	"github.com/Fantom-foundation/go-lachesis/src/dummy"
 	"github.com/Fantom-foundation/go-lachesis/src/lachesis"
 	"github.com/Fantom-foundation/go-lachesis/src/log"
 	aproxy "github.com/Fantom-foundation/go-lachesis/src/proxy"
 	"github.com/Fantom-foundation/go-lachesis/tester"
-	"github.com/sirupsen/logrus"
-	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
+	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 //NewRunCmd returns the command that starts a Lachesis node
@@ -29,7 +31,7 @@ func NewRunCmd() *cobra.Command {
 }
 
 func runSingleLachesis(config *CLIConfig) error {
-	config.Lachesis.Logger.Level = lachesis.LogLevel(config.Lachesis.LogLevel)
+	config.Lachesis.Logger.Level = utils.GetLogLevel(config.Lachesis.LogLevel)
 	config.Lachesis.NodeConfig.Logger = config.Lachesis.Logger
 	if config.Log2file {
 		f, err := os.OpenFile(fmt.Sprintf("lachesis_%v.log", config.Lachesis.BindAddr),
diff --git a/cmd/network/commands/run.go b/cmd/network/commands/run.go
index 1ef8415ff..42b02790c 100644
--- a/cmd/network/commands/run.go
+++ b/cmd/network/commands/run.go
@@ -12,9 +12,11 @@ import (
 	"syscall"
 	"time"
 
-	"github.com/Fantom-foundation/go-lachesis/src/lachesis"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
+
+	"github.com/Fantom-foundation/go-lachesis/src/lachesis"
+	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 //NewRunCmd returns the command that starts a Lachesis node
@@ -204,7 +206,7 @@ func loadConfig(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	config.Lachesis.Logger.Level = lachesis.LogLevel(config.Lachesis.LogLevel)
+	config.Lachesis.Logger.Level = utils.GetLogLevel(config.Lachesis.LogLevel)
 	config.Lachesis.NodeConfig.Logger = config.Lachesis.Logger
 
 	return nil
diff --git a/src/lachesis/lachesis_config.go b/src/lachesis/lachesis_config.go
index 8533b2101..0ea0c4db0 100644
--- a/src/lachesis/lachesis_config.go
+++ b/src/lachesis/lachesis_config.go
@@ -15,6 +15,7 @@ import (
 	"github.com/Fantom-foundation/go-lachesis/src/peer"
 	"github.com/Fantom-foundation/go-lachesis/src/pos"
 	"github.com/Fantom-foundation/go-lachesis/src/proxy"
+	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 type LachesisConfig struct {
@@ -62,7 +63,7 @@ func NewDefaultConfig() *LachesisConfig {
 		TestDelay:   1,
 	}
 
-	config.Logger.Level = LogLevel(config.LogLevel)
+	config.Logger.Level = utils.GetLogLevel(config.LogLevel)
 	lachesis_log.NewLocal(config.Logger, config.LogLevel)
 	//config.Proxy = sproxy.NewInmemAppProxy(config.Logger)
 	//config.Proxy, _ = sproxy.NewSocketAppProxy("127.0.0.1:1338", "127.0.0.1:1339", 1*time.Second, config.Logger)
@@ -109,22 +110,3 @@ func HomeDir() string {
 	}
 	return ""
 }
-
-func LogLevel(l string) logrus.Level {
-	switch l {
-	case "debug":
-		return logrus.DebugLevel
-	case "info":
-		return logrus.InfoLevel
-	case "warn":
-		return logrus.WarnLevel
-	case "error":
-		return logrus.ErrorLevel
-	case "fatal":
-		return logrus.FatalLevel
-	case "panic":
-		return logrus.PanicLevel
-	default:
-		return logrus.DebugLevel
-	}
-}
diff --git a/src/poslachesis/config.go b/src/poslachesis/config.go
index 7f9b3b643..da0ee36a1 100644
--- a/src/poslachesis/config.go
+++ b/src/poslachesis/config.go
@@ -12,6 +12,7 @@ type Config struct {
 	AppPort  int
 	CtrlPort int
 	Node     posnode.Config
+	LogLevel string
 }
 
 // DefaultConfig returns lachesis default config.
@@ -20,6 +21,7 @@ func DefaultConfig() *Config {
 		AppPort:  55556,
 		CtrlPort: 55557,
 		Node:     *posnode.DefaultConfig(),
+		LogLevel: "debug",
 	}
 }
 
diff --git a/src/poslachesis/lachesis.go b/src/poslachesis/lachesis.go
index 2e78d66bb..381c530a8 100644
--- a/src/poslachesis/lachesis.go
+++ b/src/poslachesis/lachesis.go
@@ -37,8 +37,8 @@ func makeLachesis(db *badger.DB, host string, key *common.PrivateKey, conf *Conf
 		conf = DefaultConfig()
 	}
 
-	c := posposet.New(cdb, ndb)
-	n := posnode.New(host, key, ndb, c, &conf.Node, listen, opts...)
+	c := posposet.New(cdb, ndb, conf.LogLevel)
+	n := posnode.New(host, key, ndb, c, &conf.Node, conf.LogLevel, listen, opts...)
 
 	return &Lachesis{
 		host:           host,
diff --git a/src/posnode/emitter.go b/src/posnode/emitter.go
index 4fa523ed0..549e82fe7 100644
--- a/src/posnode/emitter.go
+++ b/src/posnode/emitter.go
@@ -128,7 +128,7 @@ func (n *Node) EmitEvent() *inter.Event {
 		ExternalTransactions: externalTxns,
 	}
 	if err := event.SignBy(n.key); err != nil {
-		panic(err)
+		n.log.Fatal(err)
 	}
 
 	n.saveNewEvent(event, false)
diff --git a/src/posnode/gossip.go b/src/posnode/gossip.go
index 47cfbcd8b..d856a2f0e 100644
--- a/src/posnode/gossip.go
+++ b/src/posnode/gossip.go
@@ -144,7 +144,7 @@ func (n *Node) checkParents(client api.NodeClient, peer *Peer, parents hash.Even
 	toDownload := n.lockNotDownloaded(parents)
 	defer n.unlockDownloaded(toDownload)
 
-	n.log.Debugf("check Parents")
+	n.log.Info("check Parents")
 
 	for e := range toDownload {
 		if e == hash.ZeroEvent {
@@ -156,11 +156,11 @@ func (n *Node) checkParents(client api.NodeClient, peer *Peer, parents hash.Even
 
 		event, err := n.downloadEvent(client, peer, &req)
 		if err != nil {
-			n.log.Debugf("download parent event error: %s", err.Error())
+			n.log.Warnf("download parent event error: %s", err.Error())
 		}
 
 		if event == nil {
-			n.log.Debugf("download parent event error: Event is nil")
+			n.log.Warn("download parent event error: Event is nil")
 		}
 	}
 }
@@ -206,7 +206,7 @@ func (n *Node) downloadEvent(client api.NodeClient, peer *Peer, req *api.EventRe
 
 	id, ctx := api.ServerPeerID(ctx)
 
-	n.log.Debugf("download event")
+	n.log.Info("download event")
 
 	w, err := client.GetEvent(ctx, req)
 	if err != nil {
@@ -252,7 +252,7 @@ func (n *Node) downloadEvent(client api.NodeClient, peer *Peer, req *api.EventRe
 // Note: event should be last from its creator.
 // Note: we should not update Peer Height during save parent event.
 func (n *Node) saveNewEvent(e *inter.Event, isParent bool) {
-	n.log.Debugf("save new event")
+	n.log.Info("save new event")
 
 	n.store.SetEvent(e)
 	n.store.SetEventHash(e.Creator, e.Index, e.Hash())
diff --git a/src/posnode/gossip_test.go b/src/posnode/gossip_test.go
index c0fa92da4..6f4db8d1b 100644
--- a/src/posnode/gossip_test.go
+++ b/src/posnode/gossip_test.go
@@ -155,7 +155,7 @@ func TestMissingParents(t *testing.T) {
 		if err != nil {
 			t.Fatal(err)
 		}
-		
+
 		unknowns, err := node2.compareKnownEvents(client, peer)
 		if err != nil {
 			t.Fatal(err)
diff --git a/src/posnode/log.go b/src/posnode/log.go
index fc0f7ae0f..78220c7a5 100644
--- a/src/posnode/log.go
+++ b/src/posnode/log.go
@@ -2,13 +2,17 @@ package posnode
 
 import (
 	"github.com/sirupsen/logrus"
+
+	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 type logger struct {
 	log *logrus.Entry
 }
 
-func newLogger(node string) (r logger) {
+func newLogger(node, logLevel string) (r logger) {
+	log.SetLevel(utils.GetLogLevel(logLevel))
+
 	if node != "" {
 		r.log = log.WithField("node", node)
 	} else {
diff --git a/src/posnode/node.go b/src/posnode/node.go
index 1ede50262..4616a0ebb 100644
--- a/src/posnode/node.go
+++ b/src/posnode/node.go
@@ -34,7 +34,7 @@ type Node struct {
 
 // New creates node.
 // It does not start any process.
-func New(host string, key *common.PrivateKey, s *Store, c Consensus, conf *Config, listen network.ListenFunc, opts ...grpc.DialOption) *Node {
+func New(host string, key *common.PrivateKey, s *Store, c Consensus, conf *Config, logLevel string, listen network.ListenFunc, opts ...grpc.DialOption) *Node {
 	if key == nil {
 		key = crypto.GenerateKey()
 	}
@@ -53,7 +53,7 @@ func New(host string, key *common.PrivateKey, s *Store, c Consensus, conf *Confi
 		conf:      *conf,
 		service:   service{listen, nil},
 		connPool:  connPool{opts: opts},
-		logger:    newLogger(host),
+		logger:    newLogger(host, logLevel),
 	}
 
 	return &n
diff --git a/src/posnode/node_test.go b/src/posnode/node_test.go
index 4e19652e4..3fd9a30f5 100644
--- a/src/posnode/node_test.go
+++ b/src/posnode/node_test.go
@@ -9,5 +9,5 @@ import (
 
 // NewForTests creates node with fake network client.
 func NewForTests(host string, s *Store, c Consensus) *Node {
-	return New(host, nil, s, c, nil, network.FakeListener, FakeClient(host))
+	return New(host, nil, s, c, nil, "debug", network.FakeListener, FakeClient(host))
 }
diff --git a/src/posnode/store.go b/src/posnode/store.go
index 3a5ec5030..89b08aff1 100644
--- a/src/posnode/store.go
+++ b/src/posnode/store.go
@@ -79,7 +79,7 @@ func (s *Store) SetEventHash(creator hash.Peer, index uint64, hash hash.Event) {
 	key := append(creator.Bytes(), intToBytes(index)...)
 
 	if err := s.hashes.Put(key, hash.Bytes()); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 }
 
@@ -89,7 +89,7 @@ func (s *Store) GetEventHash(creator hash.Peer, index uint64) *hash.Event {
 
 	buf, err := s.hashes.Get(key)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	if buf == nil {
 		return nil
@@ -148,16 +148,16 @@ func (s *Store) BootstrapPeers(peers ...*Peer) {
 		var pbf proto.Buffer
 		w := peer.ToWire()
 		if err := pbf.Marshal(w); err != nil {
-			panic(err)
+			log.Fatal(err)
 		}
 		if err := batch.Put(peer.ID.Bytes(), pbf.Bytes()); err != nil {
-			panic(err)
+			log.Fatal(err)
 		}
 		ids = append(ids, peer.ID)
 	}
 
 	if err := batch.Write(); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 
 	s.SetTopPeers(ids)
@@ -180,7 +180,7 @@ func (s *Store) GetTopPeers() []hash.Peer {
 // SetPeerHeight stores last event index of peer.
 func (s *Store) SetPeerHeight(id hash.Peer, height uint64) {
 	if err := s.peerHeights.Put(id.Bytes(), intToBytes(height)); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 }
 
@@ -188,7 +188,7 @@ func (s *Store) SetPeerHeight(id hash.Peer, height uint64) {
 func (s *Store) GetPeerHeight(id hash.Peer) uint64 {
 	buf, err := s.peerHeights.Get(id.Bytes())
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	if buf == nil {
 		return 0
@@ -205,18 +205,18 @@ func (s *Store) set(table kvdb.Database, key []byte, val proto.Message) {
 	var pbf proto.Buffer
 
 	if err := pbf.Marshal(val); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 
 	if err := table.Put(key, pbf.Bytes()); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 }
 
 func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Message {
 	buf, err := table.Get(key)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	if buf == nil {
 		return nil
@@ -224,7 +224,7 @@ func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Mes
 
 	err = proto.Unmarshal(buf, to)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	return to
 }
@@ -232,7 +232,7 @@ func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Mes
 func (s *Store) has(table kvdb.Database, key []byte) bool {
 	res, err := table.Has(key)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	return res
 }
diff --git a/src/posposet/common_test.go b/src/posposet/common_test.go
index e5f751898..0704332fc 100644
--- a/src/posposet/common_test.go
+++ b/src/posposet/common_test.go
@@ -20,7 +20,7 @@ func FakePoset(nodes []hash.Peer) (*Poset, *Store, *EventStore) {
 
 	input := NewEventStore(nil, false)
 
-	poset := New(store, input)
+	poset := New(store, input, "debug")
 	poset.Bootstrap()
 
 	return poset, store, input
diff --git a/src/posposet/flag_table.go b/src/posposet/flag_table.go
index bd4363b62..c4bbe4257 100644
--- a/src/posposet/flag_table.go
+++ b/src/posposet/flag_table.go
@@ -1,7 +1,6 @@
 package posposet
 
 import (
-	"fmt"
 	"strings"
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
@@ -160,7 +159,7 @@ func WireToEventsByPeer(arr []*wire.EventDescr) EventsByPeer {
 			res[creator] = hash.Events{}
 		}
 		if !res[creator].Add(h) {
-			panic(fmt.Errorf("double value is detected"))
+			log.Fatal("double value is detected")
 		}
 	}
 
diff --git a/src/posposet/frame.go b/src/posposet/frame.go
index b5ecb26b3..99811279f 100644
--- a/src/posposet/frame.go
+++ b/src/posposet/frame.go
@@ -1,8 +1,6 @@
 package posposet
 
 import (
-	"fmt"
-
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
 	"github.com/Fantom-foundation/go-lachesis/src/posposet/wire"
@@ -103,7 +101,7 @@ func (p *Poset) setFrameSaving(f *Frame) {
 		if f.Index > p.state.LastFinishedFrameN {
 			p.store.SetFrame(f)
 		} else {
-			panic(fmt.Errorf("frame %d is finished and should not be changed", f.Index))
+			log.Fatalf("frame %d is finished and should not be changed", f.Index)
 		}
 	}
 }
diff --git a/src/posposet/frames.go b/src/posposet/frames.go
index e2fa9686f..8c3064786 100644
--- a/src/posposet/frames.go
+++ b/src/posposet/frames.go
@@ -66,7 +66,7 @@ func (p *Poset) FrameOfEvent(event hash.Event) (frame *Frame, isRoot bool) {
 // frame finds or creates frame.
 func (p *Poset) frame(n uint64, orCreate bool) *Frame {
 	if n < p.state.LastFinishedFrameN && orCreate {
-		panic(fmt.Errorf("too old frame%d is requested", n))
+		log.Fatalf("too old frame %d is requested", n)
 	}
 	// return ephemeral
 	if n == 0 {
diff --git a/src/posposet/input.go b/src/posposet/input.go
index 4d20da745..941f2193d 100644
--- a/src/posposet/input.go
+++ b/src/posposet/input.go
@@ -23,7 +23,7 @@ func (p *Poset) HasEvent(h hash.Event) bool {
 func (p *Poset) GetEvent(h hash.Event) *Event {
 	e := p.input.GetEvent(h)
 	if e == nil {
-		panic("got unsaved event")
+		log.Fatal("got unsaved event")
 	}
 	return &Event{
 		Event: *e,
diff --git a/src/posposet/poset.go b/src/posposet/poset.go
index 5d3bbd0fc..dbd443658 100644
--- a/src/posposet/poset.go
+++ b/src/posposet/poset.go
@@ -4,8 +4,11 @@ import (
 	"sort"
 	"sync"
 
+	"github.com/sirupsen/logrus"
+
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
+	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 // Poset processes events to get consensus.
@@ -26,7 +29,7 @@ type Poset struct {
 
 // New creates Poset instance.
 // It does not start any process.
-func New(store *Store, input EventSource) *Poset {
+func New(store *Store, input EventSource, logLevel string) *Poset {
 	const buffSize = 10
 
 	p := &Poset{
@@ -38,6 +41,10 @@ func New(store *Store, input EventSource) *Poset {
 		incompleteEvents: make(map[hash.Event]*Event),
 	}
 
+	log = logrus.StandardLogger()
+	log.SetLevel(utils.GetLogLevel(logLevel))
+	SetLogger(log)
+
 	return p
 }
 
@@ -188,7 +195,7 @@ func (p *Poset) consensus(e *Event) {
 	applyRewards(state, ordered)
 	balances, err := state.Commit(true)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	if applyAt.SetBalances(balances) {
 		p.reconsensusFromFrame(applyAt.Index)
diff --git a/src/posposet/poset_atropos_test.go b/src/posposet/poset_atropos_test.go
index 73a7a2afb..87c991cad 100644
--- a/src/posposet/poset_atropos_test.go
+++ b/src/posposet/poset_atropos_test.go
@@ -104,7 +104,7 @@ func testSpecialNamedAtropos(t *testing.T, tryRestoring bool, asciiScheme string
 		n++
 		if tryRestoring && n == len(names)*2/3 {
 			ee := p.incompleteEvents
-			p = New(store, input)
+			p = New(store, input, "debug")
 			p.Bootstrap()
 			for _, e := range ee {
 				input.SetEvent(&e.Event)
diff --git a/src/posposet/state.go b/src/posposet/state.go
index 511e301f8..f2a7498e2 100644
--- a/src/posposet/state.go
+++ b/src/posposet/state.go
@@ -55,7 +55,7 @@ func (p *Poset) Bootstrap() {
 	// restore state
 	p.state = p.store.GetState()
 	if p.state == nil {
-		panic("Apply genesis for store first")
+		log.Fatal("Apply genesis for store first")
 	}
 	// restore frames
 	for n := p.state.LastFinishedFrameN; true; n++ {
@@ -75,7 +75,7 @@ func GenesisHash(balances map[hash.Peer]uint64) hash.Hash {
 	defer s.Close()
 
 	if err := s.ApplyGenesis(balances); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 
 	return s.GetState().Genesis
diff --git a/src/posposet/store.go b/src/posposet/store.go
index 2878ca1ba..8c3a04968 100644
--- a/src/posposet/store.go
+++ b/src/posposet/store.go
@@ -64,7 +64,7 @@ func (s *Store) initCache() {
 	cache := func() *lru.Cache {
 		c, err := lru.New(cacheSize)
 		if err != nil {
-			panic(err)
+			log.Fatal(err)
 		}
 		return c
 	}
@@ -129,7 +129,7 @@ func (s *Store) SetEventFrame(e hash.Event, frame uint64) {
 	key := e.Bytes()
 	val := intToBytes(frame)
 	if err := s.event2frame.Put(key, val); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 
 	if s.event2frameCache != nil {
@@ -149,7 +149,7 @@ func (s *Store) GetEventFrame(e hash.Event) *uint64 {
 	key := e.Bytes()
 	buf, err := s.event2frame.Get(key)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	if buf == nil {
 		return nil
@@ -215,7 +215,7 @@ func (s *Store) GetBlock(n uint64) *Block {
 func (s *Store) StateDB(from hash.Hash) *state.DB {
 	db, err := state.New(from, s.balances)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	return db
 }
@@ -228,18 +228,18 @@ func (s *Store) set(table kvdb.Database, key []byte, val proto.Message) {
 	var pbf proto.Buffer
 
 	if err := pbf.Marshal(val); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 
 	if err := table.Put(key, pbf.Bytes()); err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 }
 
 func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Message {
 	buf, err := table.Get(key)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	if buf == nil {
 		return nil
@@ -247,7 +247,7 @@ func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Mes
 
 	err = proto.Unmarshal(buf, to)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	return to
 }
@@ -255,7 +255,7 @@ func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Mes
 func (s *Store) has(table kvdb.Database, key []byte) bool {
 	res, err := table.Has(key)
 	if err != nil {
-		panic(err)
+		log.Fatal(err)
 	}
 	return res
 }
diff --git a/src/posposet/store_test.go b/src/posposet/store_test.go
index 514e22ce6..b45eb3eb5 100644
--- a/src/posposet/store_test.go
+++ b/src/posposet/store_test.go
@@ -84,7 +84,7 @@ func benchPoset(nodes []hash.Peer, input EventSource, store *Store, cached bool)
 		panic(err)
 	}
 
-	poset := New(store, input)
+	poset := New(store, input, "debug")
 	poset.Bootstrap()
 
 	return poset
diff --git a/src/utils/util.go b/src/utils/util.go
index c318fbbbe..78d580c95 100644
--- a/src/utils/util.go
+++ b/src/utils/util.go
@@ -6,6 +6,8 @@ import (
 	"strconv"
 	"sync/atomic"
 	"testing"
+
+	"github.com/sirupsen/logrus"
 )
 
 var startBase uint32 = 12000
@@ -75,3 +77,24 @@ func FreePort(network string) (port uint16) {
 	}()
 	return uint16(l.Addr().(*net.TCPAddr).Port)
 }
+
+// GetLogLevel return logrus.Level by string.
+// Example: "debug" -> logrus.DebugLevel and etc.
+func GetLogLevel(l string) logrus.Level {
+	switch l {
+	case "debug":
+		return logrus.DebugLevel
+	case "info":
+		return logrus.InfoLevel
+	case "warn":
+		return logrus.WarnLevel
+	case "error":
+		return logrus.ErrorLevel
+	case "fatal":
+		return logrus.FatalLevel
+	case "panic":
+		return logrus.PanicLevel
+	default:
+		return logrus.DebugLevel
+	}
+}
\ No newline at end of file

From 047883d7042439d4cdbf451eefc9ac04f35600b6 Mon Sep 17 00:00:00 2001
From: devintegral2 <devintegral2@sfxdx.ru>
Date: Tue, 21 May 2019 15:41:54 +0700
Subject: [PATCH 2/5] Fix fmt.

---
 cmd/dummy_client/main.go     | 4 ++--
 cmd/lachesis/commands/run.go | 2 +-
 src/utils/util.go            | 2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/cmd/dummy_client/main.go b/cmd/dummy_client/main.go
index 5fc129f32..5fa59420a 100644
--- a/cmd/dummy_client/main.go
+++ b/cmd/dummy_client/main.go
@@ -5,11 +5,11 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-	
+
 	"github.com/rifflock/lfshook"
 	"github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
-	
+
 	"github.com/Fantom-foundation/go-lachesis/src/dummy"
 	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
diff --git a/cmd/lachesis/commands/run.go b/cmd/lachesis/commands/run.go
index cbf19d4c9..f8f057c1d 100644
--- a/cmd/lachesis/commands/run.go
+++ b/cmd/lachesis/commands/run.go
@@ -15,8 +15,8 @@ import (
 	"github.com/Fantom-foundation/go-lachesis/src/lachesis"
 	"github.com/Fantom-foundation/go-lachesis/src/log"
 	aproxy "github.com/Fantom-foundation/go-lachesis/src/proxy"
-	"github.com/Fantom-foundation/go-lachesis/tester"
 	"github.com/Fantom-foundation/go-lachesis/src/utils"
+	"github.com/Fantom-foundation/go-lachesis/tester"
 )
 
 //NewRunCmd returns the command that starts a Lachesis node
diff --git a/src/utils/util.go b/src/utils/util.go
index 78d580c95..7ad216fcb 100644
--- a/src/utils/util.go
+++ b/src/utils/util.go
@@ -97,4 +97,4 @@ func GetLogLevel(l string) logrus.Level {
 	default:
 		return logrus.DebugLevel
 	}
-}
\ No newline at end of file
+}

From f8e6a1f5aee06f3ab3ae5d55f0640881e7960d49 Mon Sep 17 00:00:00 2001
From: devintegral2 <devintegral2@sfxdx.ru>
Date: Tue, 21 May 2019 17:02:13 +0700
Subject: [PATCH 3/5] Create logger package. Revert prev changes.

---
 cmd/dummy/commands/root.go              | 24 ++++++++++---
 cmd/dummy_client/main.go                | 22 ++++++++++--
 cmd/lachesis/commands/run.go            | 10 +++---
 cmd/network/commands/run.go             |  6 ++--
 src/inter/common.go                     |  3 +-
 src/inter/event.go                      |  7 ++--
 src/lachesis/lachesis_config.go         | 22 ++++++++++--
 src/logger/logger.go                    | 48 +++++++++++++++++++++++++
 src/network/network.go                  |  6 ++--
 src/poslachesis/cli/command/transfer.go |  5 +--
 src/poslachesis/lachesis.go             | 12 +++++--
 src/poslachesis/service.go              |  5 +--
 src/posnode/api/security.go             |  7 ++--
 src/posnode/api/wire.go                 |  7 ++--
 src/posnode/builtin.go                  |  4 ++-
 src/posnode/client.go                   |  5 +--
 src/posnode/discovery.go                | 13 +++----
 src/posnode/emitter.go                  |  7 ++--
 src/posnode/gossip.go                   | 17 ++++-----
 src/posnode/log.go                      | 44 -----------------------
 src/posnode/main_test.go                |  4 ++-
 src/posnode/node.go                     |  9 +++--
 src/posnode/node_test.go                |  2 +-
 src/posnode/peers.go                    |  3 +-
 src/posnode/service.go                  |  7 ++--
 src/posnode/store.go                    | 25 ++++++-------
 src/posposet/common_test.go             |  2 +-
 src/posposet/creators.go                |  5 +--
 src/posposet/flag_table.go              |  3 +-
 src/posposet/frame.go                   |  3 +-
 src/posposet/frames.go                  |  3 +-
 src/posposet/input.go                   |  3 +-
 src/posposet/log.go                     | 22 ------------
 src/posposet/poset.go                   | 16 +++------
 src/posposet/poset_atropos_test.go      |  2 +-
 src/posposet/state.go                   |  5 +--
 src/posposet/store.go                   | 19 +++++-----
 src/posposet/store_test.go              |  2 +-
 src/posposet/time.go                    |  5 +--
 src/posposet/transaction.go             |  3 +-
 src/utils/util.go                       | 23 ------------
 41 files changed, 237 insertions(+), 203 deletions(-)
 create mode 100644 src/logger/logger.go
 delete mode 100644 src/posnode/log.go
 delete mode 100644 src/posposet/log.go

diff --git a/cmd/dummy/commands/root.go b/cmd/dummy/commands/root.go
index fec9b24dd..3db62160f 100644
--- a/cmd/dummy/commands/root.go
+++ b/cmd/dummy/commands/root.go
@@ -6,13 +6,11 @@ import (
 	"io/ioutil"
 	"os"
 
+	"github.com/Fantom-foundation/go-lachesis/src/dummy"
 	"github.com/rifflock/lfshook"
 	"github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
-
-	"github.com/Fantom-foundation/go-lachesis/src/dummy"
-	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 var (
@@ -75,7 +73,7 @@ func loadConfig(cmd *cobra.Command, args []string) error {
 		return err
 	}
 	logger = newLogger()
-	logger.Level = utils.GetLogLevel(config.LogLevel)
+	logger.Level = logLevel(config.LogLevel)
 	logger.WithFields(logrus.Fields{
 		"name":          config.Name,
 		"client-listen": config.ClientAddr,
@@ -119,3 +117,21 @@ func newLogger() *logrus.Logger {
 	))
 	return logger
 }
+func logLevel(l string) logrus.Level {
+	switch l {
+	case "debug":
+		return logrus.DebugLevel
+	case "info":
+		return logrus.InfoLevel
+	case "warn":
+		return logrus.WarnLevel
+	case "error":
+		return logrus.ErrorLevel
+	case "fatal":
+		return logrus.FatalLevel
+	case "panic":
+		return logrus.PanicLevel
+	default:
+		return logrus.DebugLevel
+	}
+}
\ No newline at end of file
diff --git a/cmd/dummy_client/main.go b/cmd/dummy_client/main.go
index 5fa59420a..618dce3a2 100644
--- a/cmd/dummy_client/main.go
+++ b/cmd/dummy_client/main.go
@@ -11,7 +11,6 @@ import (
 	"github.com/urfave/cli"
 
 	"github.com/Fantom-foundation/go-lachesis/src/dummy"
-	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 var (
@@ -58,7 +57,7 @@ func main() {
 
 func run(c *cli.Context) error {
 	logger := newLogger()
-	logger.Level = utils.GetLogLevel(c.String(LogLevelFlag.Name))
+	logger.Level = logLevel(c.String(LogLevelFlag.Name))
 
 	name := c.String(NameFlag.Name)
 	address := c.String(ProxyAddressFlag.Name)
@@ -112,3 +111,22 @@ func newLogger() *logrus.Logger {
 	))
 	return logger
 }
+
+func logLevel(l string) logrus.Level {
+	switch l {
+	case "debug":
+		return logrus.DebugLevel
+	case "info":
+		return logrus.InfoLevel
+	case "warn":
+		return logrus.WarnLevel
+	case "error":
+		return logrus.ErrorLevel
+	case "fatal":
+		return logrus.FatalLevel
+	case "panic":
+		return logrus.PanicLevel
+	default:
+		return logrus.DebugLevel
+	}
+}
\ No newline at end of file
diff --git a/cmd/lachesis/commands/run.go b/cmd/lachesis/commands/run.go
index f8f057c1d..c88ca82cb 100644
--- a/cmd/lachesis/commands/run.go
+++ b/cmd/lachesis/commands/run.go
@@ -7,16 +7,14 @@ import (
 	"runtime"
 	"time"
 
-	"github.com/sirupsen/logrus"
-	"github.com/spf13/cobra"
-	"github.com/spf13/viper"
-
 	"github.com/Fantom-foundation/go-lachesis/src/dummy"
 	"github.com/Fantom-foundation/go-lachesis/src/lachesis"
 	"github.com/Fantom-foundation/go-lachesis/src/log"
 	aproxy "github.com/Fantom-foundation/go-lachesis/src/proxy"
-	"github.com/Fantom-foundation/go-lachesis/src/utils"
 	"github.com/Fantom-foundation/go-lachesis/tester"
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )
 
 //NewRunCmd returns the command that starts a Lachesis node
@@ -31,7 +29,7 @@ func NewRunCmd() *cobra.Command {
 }
 
 func runSingleLachesis(config *CLIConfig) error {
-	config.Lachesis.Logger.Level = utils.GetLogLevel(config.Lachesis.LogLevel)
+	config.Lachesis.Logger.Level = lachesis.LogLevel(config.Lachesis.LogLevel)
 	config.Lachesis.NodeConfig.Logger = config.Lachesis.Logger
 	if config.Log2file {
 		f, err := os.OpenFile(fmt.Sprintf("lachesis_%v.log", config.Lachesis.BindAddr),
diff --git a/cmd/network/commands/run.go b/cmd/network/commands/run.go
index 42b02790c..1ef8415ff 100644
--- a/cmd/network/commands/run.go
+++ b/cmd/network/commands/run.go
@@ -12,11 +12,9 @@ import (
 	"syscall"
 	"time"
 
+	"github.com/Fantom-foundation/go-lachesis/src/lachesis"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
-
-	"github.com/Fantom-foundation/go-lachesis/src/lachesis"
-	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 //NewRunCmd returns the command that starts a Lachesis node
@@ -206,7 +204,7 @@ func loadConfig(cmd *cobra.Command, args []string) error {
 		return err
 	}
 
-	config.Lachesis.Logger.Level = utils.GetLogLevel(config.Lachesis.LogLevel)
+	config.Lachesis.Logger.Level = lachesis.LogLevel(config.Lachesis.LogLevel)
 	config.Lachesis.NodeConfig.Logger = config.Lachesis.Logger
 
 	return nil
diff --git a/src/inter/common.go b/src/inter/common.go
index 43e3e74b4..0e8519704 100644
--- a/src/inter/common.go
+++ b/src/inter/common.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // ParseEvents parses events from ASCII-scheme for test purpose.
@@ -47,7 +48,7 @@ func ParseEvents(asciiScheme string) (
 				break
 			default: // it is a event name
 				if _, ok := names[symbol]; ok {
-					panic(fmt.Errorf("event '%s' already exists", symbol))
+					logger.Log.Fatalf("event '%s' already exists", symbol)
 				}
 				nCreators = append(nCreators, current-1)
 				nNames = append(nNames, symbol)
diff --git a/src/inter/event.go b/src/inter/event.go
index 1b4635187..5eb2af638 100644
--- a/src/inter/event.go
+++ b/src/inter/event.go
@@ -9,6 +9,7 @@ import (
 	"github.com/Fantom-foundation/go-lachesis/src/crypto"
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter/wire"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 /*
@@ -44,7 +45,7 @@ func (e *Event) SignBy(priv *common.PrivateKey) error {
 // Verify sign event by public key.
 func (e *Event) Verify(pubKey *common.PublicKey) bool {
 	if pubKey == nil {
-		panic("can't verify")
+		logger.Log.Fatal("can't verify")
 	}
 
 	if e.Sign == "" {
@@ -54,7 +55,7 @@ func (e *Event) Verify(pubKey *common.PublicKey) bool {
 	hash := e.Hash()
 	r, s, err := crypto.DecodeSignature(string(e.Sign))
 	if err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 
 	return pubKey.Verify(hash.Bytes(), r, s)
@@ -112,7 +113,7 @@ func EventHashOf(e *Event) hash.Event {
 	w.Sign = ""
 	buf, err := proto.Marshal(w)
 	if err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 	return hash.Event(hash.Of(buf))
 }
diff --git a/src/lachesis/lachesis_config.go b/src/lachesis/lachesis_config.go
index 0ea0c4db0..5d3aa987f 100644
--- a/src/lachesis/lachesis_config.go
+++ b/src/lachesis/lachesis_config.go
@@ -15,7 +15,6 @@ import (
 	"github.com/Fantom-foundation/go-lachesis/src/peer"
 	"github.com/Fantom-foundation/go-lachesis/src/pos"
 	"github.com/Fantom-foundation/go-lachesis/src/proxy"
-	"github.com/Fantom-foundation/go-lachesis/src/utils"
 )
 
 type LachesisConfig struct {
@@ -63,7 +62,7 @@ func NewDefaultConfig() *LachesisConfig {
 		TestDelay:   1,
 	}
 
-	config.Logger.Level = utils.GetLogLevel(config.LogLevel)
+	config.Logger.Level = LogLevel(config.LogLevel)
 	lachesis_log.NewLocal(config.Logger, config.LogLevel)
 	//config.Proxy = sproxy.NewInmemAppProxy(config.Logger)
 	//config.Proxy, _ = sproxy.NewSocketAppProxy("127.0.0.1:1338", "127.0.0.1:1339", 1*time.Second, config.Logger)
@@ -110,3 +109,22 @@ func HomeDir() string {
 	}
 	return ""
 }
+
+func LogLevel(l string) logrus.Level {
+	switch l {
+	case "debug":
+		return logrus.DebugLevel
+	case "info":
+		return logrus.InfoLevel
+	case "warn":
+		return logrus.WarnLevel
+	case "error":
+		return logrus.ErrorLevel
+	case "fatal":
+		return logrus.FatalLevel
+	case "panic":
+		return logrus.PanicLevel
+	default:
+		return logrus.DebugLevel
+	}
+}
\ No newline at end of file
diff --git a/src/logger/logger.go b/src/logger/logger.go
new file mode 100644
index 000000000..72e8af502
--- /dev/null
+++ b/src/logger/logger.go
@@ -0,0 +1,48 @@
+package logger
+
+import (
+	"github.com/sirupsen/logrus"
+)
+
+/*
+ * global vars:
+ */
+
+var (
+	Log *logrus.Logger
+)
+
+func init() {
+	defaults := logrus.StandardLogger()
+	defaults.SetLevel(logrus.DebugLevel)
+	SetLogger(defaults)
+}
+
+// SetLogger sets logger for whole package.
+func SetLogger(custom *logrus.Logger) {
+	if custom == nil {
+		panic("Nil-logger set")
+	}
+	Log = custom
+}
+
+// GetLevel return logrus.Level by string.
+// Example: "debug" -> logrus.DebugLevel and etc.
+func GetLevel(l string) logrus.Level {
+	switch l {
+	case "debug":
+		return logrus.DebugLevel
+	case "info":
+		return logrus.InfoLevel
+	case "warn":
+		return logrus.WarnLevel
+	case "error":
+		return logrus.ErrorLevel
+	case "fatal":
+		return logrus.FatalLevel
+	case "panic":
+		return logrus.PanicLevel
+	default:
+		return logrus.DebugLevel
+	}
+}
\ No newline at end of file
diff --git a/src/network/network.go b/src/network/network.go
index 094592c0e..ec0ca65e3 100644
--- a/src/network/network.go
+++ b/src/network/network.go
@@ -3,6 +3,8 @@ package network
 import (
 	"context"
 	"net"
+
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // ListenFunc returns addr listener.
@@ -13,7 +15,7 @@ type ListenFunc func(addr string) net.Listener
 func TCPListener(addr string) net.Listener {
 	res, err := net.Listen("tcp", addr)
 	if err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 	return res
 }
@@ -23,7 +25,7 @@ func TCPListener(addr string) net.Listener {
 func FakeListener(addr string) net.Listener {
 	res, err := listenFreeAddr(Addr(addr))
 	if err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 
 	return res
diff --git a/src/poslachesis/cli/command/transfer.go b/src/poslachesis/cli/command/transfer.go
index a7925f913..eba5c0ea5 100644
--- a/src/poslachesis/cli/command/transfer.go
+++ b/src/poslachesis/cli/command/transfer.go
@@ -4,6 +4,7 @@ import (
 	"github.com/spf13/cobra"
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // Transfer makes a transaction for stake transfer.
@@ -44,9 +45,9 @@ func init() {
 	Transfer.Flags().Uint64("amount", 0, "transaction amount (required)")
 
 	if err := Transfer.MarkFlagRequired("receiver"); err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 	if err := Transfer.MarkFlagRequired("amount"); err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 }
diff --git a/src/poslachesis/lachesis.go b/src/poslachesis/lachesis.go
index 381c530a8..78574d07d 100644
--- a/src/poslachesis/lachesis.go
+++ b/src/poslachesis/lachesis.go
@@ -2,11 +2,13 @@ package lachesis
 
 import (
 	"github.com/dgraph-io/badger"
+	"github.com/sirupsen/logrus"
 	"google.golang.org/grpc"
 
 	"github.com/Fantom-foundation/go-lachesis/src/common"
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/kvdb"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/network"
 	"github.com/Fantom-foundation/go-lachesis/src/posnode"
 	"github.com/Fantom-foundation/go-lachesis/src/posposet"
@@ -37,8 +39,12 @@ func makeLachesis(db *badger.DB, host string, key *common.PrivateKey, conf *Conf
 		conf = DefaultConfig()
 	}
 
-	c := posposet.New(cdb, ndb, conf.LogLevel)
-	n := posnode.New(host, key, ndb, c, &conf.Node, conf.LogLevel, listen, opts...)
+	l := logrus.StandardLogger()
+	l.SetLevel(logger.GetLevel(conf.LogLevel))
+	logger.SetLogger(l)
+
+	c := posposet.New(cdb, ndb)
+	n := posnode.New(host, key, ndb, c, &conf.Node, listen, opts...)
 
 	return &Lachesis{
 		host:           host,
@@ -75,7 +81,7 @@ func (l *Lachesis) AddPeers(hosts ...string) {
 
 func (l *Lachesis) init(genesis map[hash.Peer]uint64) {
 	if err := l.consensusStore.ApplyGenesis(genesis); err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 }
 
diff --git a/src/poslachesis/service.go b/src/poslachesis/service.go
index 94b5f883f..f811d03e9 100644
--- a/src/poslachesis/service.go
+++ b/src/poslachesis/service.go
@@ -1,6 +1,7 @@
 package lachesis
 
 import (
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/network"
 	"github.com/Fantom-foundation/go-lachesis/src/poset"
 	"github.com/Fantom-foundation/go-lachesis/src/posposet"
@@ -27,7 +28,7 @@ func (l *Lachesis) serviceStart() {
 			l.service.listen,
 		)
 		if err != nil {
-			panic(err)
+			logger.Log.Fatal(err)
 		}
 		defer ctrl.Close()
 
@@ -42,7 +43,7 @@ func (l *Lachesis) serviceStart() {
 			l.service.listen,
 		)
 		if err != nil {
-			panic(err)
+			logger.Log.Fatal(err)
 		}
 		defer app.Close()
 
diff --git a/src/posnode/api/security.go b/src/posnode/api/security.go
index 146347179..4eefdee4d 100644
--- a/src/posnode/api/security.go
+++ b/src/posnode/api/security.go
@@ -15,6 +15,7 @@ import (
 	"github.com/Fantom-foundation/go-lachesis/src/common"
 	"github.com/Fantom-foundation/go-lachesis/src/crypto"
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // peerID is a internal key for context.Value().
@@ -86,7 +87,7 @@ func ServerAuth(key *common.PrivateKey) grpc.UnaryServerInterceptor {
 		sign := signData(resp, key)
 		md := metadata.Pairs("sign", sign, "pub", pub)
 		if e := grpc.SetTrailer(ctx, md); e != nil {
-			panic(err)
+			logger.Log.Fatal(err)
 		}
 
 		return resp, err
@@ -154,7 +155,7 @@ func verifyData(data interface{}, sign string, pub *common.PublicKey) error {
 func hashOfData(data interface{}) hash.Hash {
 	d, ok := data.(proto.Message)
 	if !ok {
-		panic("data is not proto.Message")
+		logger.Log.Fatal("data is not proto.Message")
 	}
 
 	if IsProtoEmpty(&d) {
@@ -164,7 +165,7 @@ func hashOfData(data interface{}) hash.Hash {
 	var pbf proto.Buffer
 	pbf.SetDeterministic(true)
 	if err := pbf.Marshal(d); err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 
 	return hash.Of(pbf.Bytes())
diff --git a/src/posnode/api/wire.go b/src/posnode/api/wire.go
index 66c9db14f..562540521 100644
--- a/src/posnode/api/wire.go
+++ b/src/posnode/api/wire.go
@@ -20,6 +20,7 @@ import (
 
 	"github.com/Fantom-foundation/go-lachesis/src/common"
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/network"
 )
 
@@ -48,13 +49,13 @@ func StartService(bind string, key *common.PrivateKey, svc NodeServer, log func(
 func GrpcPeerHost(ctx context.Context) string {
 	p, ok := peer.FromContext(ctx)
 	if !ok {
-		panic("GrpcPeerHost should be called from gRPC handler only")
+		logger.Log.Fatal("GrpcPeerHost should be called from gRPC handler only")
 	}
 
 	addr := p.Addr.String()
 	host, _, err := net.SplitHostPort(addr)
 	if err != nil {
-		panic(err)
+		logger.Log.Fatal(err)
 	}
 	return host
 }
@@ -63,7 +64,7 @@ func GrpcPeerHost(ctx context.Context) string {
 func GrpcPeerID(ctx context.Context) hash.Peer {
 	id, ok := ctx.Value(peerID{}).(hash.Peer)
 	if !ok {
-		panic("GrpcPeerID should be called from gRPC handler only")
+		logger.Log.Fatal("GrpcPeerID should be called from gRPC handler only")
 	}
 
 	return id
diff --git a/src/posnode/builtin.go b/src/posnode/builtin.go
index 6ce5ba8f6..df3237ec3 100644
--- a/src/posnode/builtin.go
+++ b/src/posnode/builtin.go
@@ -2,6 +2,8 @@ package posnode
 
 import (
 	"sync"
+
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // builtin is a set of some built in data.
@@ -19,7 +21,7 @@ func (n *Node) AddBuiltInPeers(hosts ...string) {
 
 	n.builtin.hosts = append(n.builtin.hosts, hosts...)
 
-	n.log.Debugf("built in peer hosts: %v", n.builtin.hosts)
+	logger.Log.Debugf("built in peer hosts: %v", n.builtin.hosts)
 }
 
 // NextBuiltInPeer returns next peer host or empty string.
diff --git a/src/posnode/client.go b/src/posnode/client.go
index b80b39934..f62a8b5c6 100644
--- a/src/posnode/client.go
+++ b/src/posnode/client.go
@@ -10,6 +10,7 @@ import (
 	"github.com/pkg/errors"
 	"google.golang.org/grpc"
 
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/posnode/api"
 )
 
@@ -50,12 +51,12 @@ func (n *Node) initClient() {
 // ConnectTo connects to other node service.
 func (n *Node) ConnectTo(peer *Peer) (client api.NodeClient, free func(), fail func(error), err error) {
 	addr := n.NetAddrOf(peer.Host)
-	n.log.Debugf("connect to %s", addr)
+	logger.Log.Debugf("connect to %s", addr)
 
 	c, err := n.connPool.Get(addr)
 	if err != nil {
 		err = errors.Wrapf(err, "connect to: %s", addr)
-		n.log.Warn(err)
+		logger.Log.Warn(err)
 		return
 	}
 
diff --git a/src/posnode/discovery.go b/src/posnode/discovery.go
index 440f538ec..e137bddcb 100644
--- a/src/posnode/discovery.go
+++ b/src/posnode/discovery.go
@@ -9,6 +9,7 @@ import (
 	"google.golang.org/grpc/status"
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/posnode/api"
 )
 
@@ -58,7 +59,7 @@ func (n *Node) StartDiscovery() {
 		}
 	}()
 
-	n.log.Info("discovery started")
+	logger.Log.Info("discovery started")
 }
 
 // StopDiscovery stops network discovery.
@@ -70,7 +71,7 @@ func (n *Node) StopDiscovery() {
 	close(n.discovery.done)
 	n.discovery.done = nil
 
-	n.log.Info("discovery stopped")
+	logger.Log.Info("discovery stopped")
 }
 
 // CheckPeerIsKnown queues peer checking for a late.
@@ -81,7 +82,7 @@ func (n *Node) CheckPeerIsKnown(host string, id *hash.Peer) {
 		unknown: id,
 	}:
 	default:
-		n.log.Warn("discovery.tasks queue is full, so skipped")
+		logger.Log.Warn("discovery.tasks queue is full, so skipped")
 	}
 }
 
@@ -94,7 +95,7 @@ func (n *Node) AskPeerInfo(host string, id *hash.Peer) {
 		return
 	}
 
-	n.log.Debugf("ask %s about peer %s", host, id)
+	logger.Log.Debugf("ask %s about peer %s", host, id)
 
 	peer := &Peer{Host: host}
 
@@ -116,7 +117,7 @@ func (n *Node) AskPeerInfo(host string, id *hash.Peer) {
 		if id == nil {
 			n.ConnectFail(peer, fmt.Errorf("host %s knows nothing about self", host))
 		} else {
-			n.log.Warnf("peer %s (%s) knows nothing about %s", source.String(), host, id.String())
+			logger.Log.Warnf("peer %s (%s) knows nothing about %s", source.String(), host, id.String())
 			n.ConnectOK(peer)
 		}
 		return
@@ -136,7 +137,7 @@ func (n *Node) AskPeerInfo(host string, id *hash.Peer) {
 	info.Host = host
 	peer = WireToPeer(info)
 	n.store.SetWirePeer(peer.ID, info)
-	n.log.Debugf("discovered new peer %s with host %s", info.ID, info.Host)
+	logger.Log.Debugf("discovered new peer %s with host %s", info.ID, info.Host)
 	n.ConnectOK(peer)
 }
 
diff --git a/src/posnode/emitter.go b/src/posnode/emitter.go
index 549e82fe7..67358d67c 100644
--- a/src/posnode/emitter.go
+++ b/src/posnode/emitter.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // emitter creates events from external transactions.
@@ -80,7 +81,7 @@ func (n *Node) EmitEvent() *inter.Event {
 	n.emitter.Lock()
 	defer n.emitter.Unlock()
 
-	n.log.Debugf("emiting event")
+	logger.Log.Debugf("emiting event")
 
 	var (
 		index          uint64
@@ -128,11 +129,11 @@ func (n *Node) EmitEvent() *inter.Event {
 		ExternalTransactions: externalTxns,
 	}
 	if err := event.SignBy(n.key); err != nil {
-		n.log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 
 	n.saveNewEvent(event, false)
-	n.log.Debugf("new event emited %s", event)
+	logger.Log.Debugf("new event emited %s", event)
 
 	return event
 }
diff --git a/src/posnode/gossip.go b/src/posnode/gossip.go
index d856a2f0e..2062bbe11 100644
--- a/src/posnode/gossip.go
+++ b/src/posnode/gossip.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/posnode/api"
 )
 
@@ -49,7 +50,7 @@ func (n *Node) StartGossip(threads int) {
 
 	go n.gossiping(n.gossip.tickets)
 
-	n.log.Info("gossip started")
+	logger.Log.Info("gossip started")
 }
 
 // StopGossip stops gossiping.
@@ -64,7 +65,7 @@ func (n *Node) StopGossip() {
 	close(n.gossip.tickets)
 	n.gossip.tickets = nil
 
-	n.log.Info("gossip stopped")
+	logger.Log.Info("gossip stopped")
 }
 
 // gossiping is a infinity gossip process.
@@ -77,7 +78,7 @@ func (n *Node) gossiping(tickets chan struct{}) {
 				defer n.FreePeer(peer)
 				n.syncWithPeer(peer)
 			} else {
-				n.log.Warn("no candidate for gossip")
+				logger.Log.Warn("no candidate for gossip")
 			}
 			time.Sleep(gossipIdle)
 		}()
@@ -144,7 +145,7 @@ func (n *Node) checkParents(client api.NodeClient, peer *Peer, parents hash.Even
 	toDownload := n.lockNotDownloaded(parents)
 	defer n.unlockDownloaded(toDownload)
 
-	n.log.Info("check Parents")
+	logger.Log.Info("check Parents")
 
 	for e := range toDownload {
 		if e == hash.ZeroEvent {
@@ -156,11 +157,11 @@ func (n *Node) checkParents(client api.NodeClient, peer *Peer, parents hash.Even
 
 		event, err := n.downloadEvent(client, peer, &req)
 		if err != nil {
-			n.log.Warnf("download parent event error: %s", err.Error())
+			logger.Log.Warnf("download parent event error: %s", err.Error())
 		}
 
 		if event == nil {
-			n.log.Warn("download parent event error: Event is nil")
+			logger.Log.Warn("download parent event error: Event is nil")
 		}
 	}
 }
@@ -206,7 +207,7 @@ func (n *Node) downloadEvent(client api.NodeClient, peer *Peer, req *api.EventRe
 
 	id, ctx := api.ServerPeerID(ctx)
 
-	n.log.Info("download event")
+	logger.Log.Info("download event")
 
 	w, err := client.GetEvent(ctx, req)
 	if err != nil {
@@ -252,7 +253,7 @@ func (n *Node) downloadEvent(client api.NodeClient, peer *Peer, req *api.EventRe
 // Note: event should be last from its creator.
 // Note: we should not update Peer Height during save parent event.
 func (n *Node) saveNewEvent(e *inter.Event, isParent bool) {
-	n.log.Info("save new event")
+	logger.Log.Info("save new event")
 
 	n.store.SetEvent(e)
 	n.store.SetEventHash(e.Creator, e.Index, e.Hash())
diff --git a/src/posnode/log.go b/src/posnode/log.go
deleted file mode 100644
index 78220c7a5..000000000
--- a/src/posnode/log.go
+++ /dev/null
@@ -1,44 +0,0 @@
-package posnode
-
-import (
-	"github.com/sirupsen/logrus"
-
-	"github.com/Fantom-foundation/go-lachesis/src/utils"
-)
-
-type logger struct {
-	log *logrus.Entry
-}
-
-func newLogger(node, logLevel string) (r logger) {
-	log.SetLevel(utils.GetLogLevel(logLevel))
-
-	if node != "" {
-		r.log = log.WithField("node", node)
-	} else {
-		r.log = logrus.NewEntry(log)
-	}
-	return
-}
-
-/*
- * global vars:
- */
-
-var (
-	log *logrus.Logger
-)
-
-func init() {
-	defaults := logrus.StandardLogger()
-	defaults.SetLevel(logrus.DebugLevel)
-	SetLogger(defaults)
-}
-
-// SetLogger sets logger for whole package.
-func SetLogger(custom *logrus.Logger) {
-	if custom == nil {
-		panic("Nil-logger set")
-	}
-	log = custom
-}
diff --git a/src/posnode/main_test.go b/src/posnode/main_test.go
index d5f0997e2..bd5244020 100644
--- a/src/posnode/main_test.go
+++ b/src/posnode/main_test.go
@@ -4,6 +4,8 @@ import (
 	"io/ioutil"
 	"os"
 	"testing"
+
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 const (
@@ -14,7 +16,7 @@ const (
 // TestMain is for test mode settings
 func TestMain(m *testing.M) {
 	if noLogOutput {
-		log.Out = ioutil.Discard
+		logger.Log.Out = ioutil.Discard
 	}
 
 	os.Exit(m.Run())
diff --git a/src/posnode/node.go b/src/posnode/node.go
index 4616a0ebb..7a37db5d9 100644
--- a/src/posnode/node.go
+++ b/src/posnode/node.go
@@ -7,6 +7,7 @@ import (
 	"github.com/Fantom-foundation/go-lachesis/src/crypto"
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/network"
 )
 
@@ -29,12 +30,11 @@ type Node struct {
 	downloads
 	discovery
 	builtin
-	logger
 }
 
 // New creates node.
 // It does not start any process.
-func New(host string, key *common.PrivateKey, s *Store, c Consensus, conf *Config, logLevel string, listen network.ListenFunc, opts ...grpc.DialOption) *Node {
+func New(host string, key *common.PrivateKey, s *Store, c Consensus, conf *Config, listen network.ListenFunc, opts ...grpc.DialOption) *Node {
 	if key == nil {
 		key = crypto.GenerateKey()
 	}
@@ -53,7 +53,6 @@ func New(host string, key *common.PrivateKey, s *Store, c Consensus, conf *Confi
 		conf:      *conf,
 		service:   service{listen, nil},
 		connPool:  connPool{opts: opts},
-		logger:    newLogger(host, logLevel),
 	}
 
 	return &n
@@ -109,13 +108,13 @@ func (n *Node) LastEventOf(peer hash.Peer) *inter.Event {
 func (n *Node) EventOf(peer hash.Peer, i uint64) *inter.Event {
 	h := n.store.GetEventHash(peer, i)
 	if h == nil {
-		n.log.Errorf("no event hash for (%s,%d) in store", peer.String(), i)
+		logger.Log.Errorf("no event hash for (%s,%d) in store", peer.String(), i)
 		return nil
 	}
 
 	e := n.store.GetEvent(*h)
 	if e == nil {
-		n.log.Errorf("no event in store of %d", i)
+		logger.Log.Errorf("no event in store of %d", i)
 	}
 
 	return e
diff --git a/src/posnode/node_test.go b/src/posnode/node_test.go
index 3fd9a30f5..4e19652e4 100644
--- a/src/posnode/node_test.go
+++ b/src/posnode/node_test.go
@@ -9,5 +9,5 @@ import (
 
 // NewForTests creates node with fake network client.
 func NewForTests(host string, s *Store, c Consensus) *Node {
-	return New(host, nil, s, c, nil, "debug", network.FakeListener, FakeClient(host))
+	return New(host, nil, s, c, nil, network.FakeListener, FakeClient(host))
 }
diff --git a/src/posnode/peers.go b/src/posnode/peers.go
index c60b70199..c20831cac 100644
--- a/src/posnode/peers.go
+++ b/src/posnode/peers.go
@@ -6,6 +6,7 @@ import (
 	"time"
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // peers manages node peer list.
@@ -128,7 +129,7 @@ func (n *Node) ConnectOK(p *Peer) {
 
 // ConnectFail counts unsuccessful connections to peer.
 func (n *Node) ConnectFail(p *Peer, err error) {
-	n.log.Warn(err)
+	logger.Log.Warn(err)
 
 	n.peers.Lock()
 	defer n.peers.Unlock()
diff --git a/src/posnode/service.go b/src/posnode/service.go
index e1a386feb..1a1a65d84 100644
--- a/src/posnode/service.go
+++ b/src/posnode/service.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter/wire"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/network"
 	"github.com/Fantom-foundation/go-lachesis/src/posnode/api"
 )
@@ -30,9 +31,9 @@ func (n *Node) StartService() {
 	}
 
 	bind := n.NetAddrOf(n.host)
-	n.server, _ = api.StartService(bind, n.key, n, n.log.Infof, n.service.listen)
+	n.server, _ = api.StartService(bind, n.key, n, logger.Log.Infof, n.service.listen)
 
-	n.log.Info("service started")
+	logger.Log.Info("service started")
 }
 
 // StopService stops node service.
@@ -43,7 +44,7 @@ func (n *Node) StopService() {
 	n.server.GracefulStop()
 	n.server = nil
 
-	n.log.Info("service stopped")
+	logger.Log.Info("service stopped")
 }
 
 /*
diff --git a/src/posnode/store.go b/src/posnode/store.go
index 89b08aff1..4f2a1c478 100644
--- a/src/posnode/store.go
+++ b/src/posnode/store.go
@@ -7,6 +7,7 @@ import (
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
 	"github.com/Fantom-foundation/go-lachesis/src/inter/wire"
 	"github.com/Fantom-foundation/go-lachesis/src/kvdb"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/posnode/api"
 )
 
@@ -79,7 +80,7 @@ func (s *Store) SetEventHash(creator hash.Peer, index uint64, hash hash.Event) {
 	key := append(creator.Bytes(), intToBytes(index)...)
 
 	if err := s.hashes.Put(key, hash.Bytes()); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 }
 
@@ -89,7 +90,7 @@ func (s *Store) GetEventHash(creator hash.Peer, index uint64) *hash.Event {
 
 	buf, err := s.hashes.Get(key)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	if buf == nil {
 		return nil
@@ -148,16 +149,16 @@ func (s *Store) BootstrapPeers(peers ...*Peer) {
 		var pbf proto.Buffer
 		w := peer.ToWire()
 		if err := pbf.Marshal(w); err != nil {
-			log.Fatal(err)
+			logger.Log.Fatal(err)
 		}
 		if err := batch.Put(peer.ID.Bytes(), pbf.Bytes()); err != nil {
-			log.Fatal(err)
+			logger.Log.Fatal(err)
 		}
 		ids = append(ids, peer.ID)
 	}
 
 	if err := batch.Write(); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 
 	s.SetTopPeers(ids)
@@ -180,7 +181,7 @@ func (s *Store) GetTopPeers() []hash.Peer {
 // SetPeerHeight stores last event index of peer.
 func (s *Store) SetPeerHeight(id hash.Peer, height uint64) {
 	if err := s.peerHeights.Put(id.Bytes(), intToBytes(height)); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 }
 
@@ -188,7 +189,7 @@ func (s *Store) SetPeerHeight(id hash.Peer, height uint64) {
 func (s *Store) GetPeerHeight(id hash.Peer) uint64 {
 	buf, err := s.peerHeights.Get(id.Bytes())
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	if buf == nil {
 		return 0
@@ -205,18 +206,18 @@ func (s *Store) set(table kvdb.Database, key []byte, val proto.Message) {
 	var pbf proto.Buffer
 
 	if err := pbf.Marshal(val); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 
 	if err := table.Put(key, pbf.Bytes()); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 }
 
 func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Message {
 	buf, err := table.Get(key)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	if buf == nil {
 		return nil
@@ -224,7 +225,7 @@ func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Mes
 
 	err = proto.Unmarshal(buf, to)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	return to
 }
@@ -232,7 +233,7 @@ func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Mes
 func (s *Store) has(table kvdb.Database, key []byte) bool {
 	res, err := table.Has(key)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	return res
 }
diff --git a/src/posposet/common_test.go b/src/posposet/common_test.go
index 0704332fc..e5f751898 100644
--- a/src/posposet/common_test.go
+++ b/src/posposet/common_test.go
@@ -20,7 +20,7 @@ func FakePoset(nodes []hash.Peer) (*Poset, *Store, *EventStore) {
 
 	input := NewEventStore(nil, false)
 
-	poset := New(store, input, "debug")
+	poset := New(store, input)
 	poset.Bootstrap()
 
 	return poset, store, input
diff --git a/src/posposet/creators.go b/src/posposet/creators.go
index 19f17929b..1bc3baf75 100644
--- a/src/posposet/creators.go
+++ b/src/posposet/creators.go
@@ -2,6 +2,7 @@ package posposet
 
 import (
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 /*
@@ -23,7 +24,7 @@ func newParentsValidator(e *Event) *parentsValidator {
 
 func (v *parentsValidator) IsParentUnique(node hash.Peer) bool {
 	if _, ok := v.nodes[node]; ok {
-		log.Warnf("Event %s has double refer to node %s, so rejected",
+		logger.Log.Warnf("Event %s has double refer to node %s, so rejected",
 			v.event.Hash().String(),
 			node.String())
 		return false
@@ -35,7 +36,7 @@ func (v *parentsValidator) IsParentUnique(node hash.Peer) bool {
 
 func (v *parentsValidator) HasSelfParent() bool {
 	if _, ok := v.nodes[v.event.Creator]; !ok {
-		log.Warnf("Event %s has no refer to self-node %s, so rejected",
+		logger.Log.Warnf("Event %s has no refer to self-node %s, so rejected",
 			v.event.Hash().String(),
 			v.event.Creator.String())
 		return false
diff --git a/src/posposet/flag_table.go b/src/posposet/flag_table.go
index c4bbe4257..ec1359bb9 100644
--- a/src/posposet/flag_table.go
+++ b/src/posposet/flag_table.go
@@ -4,6 +4,7 @@ import (
 	"strings"
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/posposet/wire"
 )
 
@@ -159,7 +160,7 @@ func WireToEventsByPeer(arr []*wire.EventDescr) EventsByPeer {
 			res[creator] = hash.Events{}
 		}
 		if !res[creator].Add(h) {
-			log.Fatal("double value is detected")
+			logger.Log.Fatal("double value is detected")
 		}
 	}
 
diff --git a/src/posposet/frame.go b/src/posposet/frame.go
index 99811279f..7d24bb20b 100644
--- a/src/posposet/frame.go
+++ b/src/posposet/frame.go
@@ -3,6 +3,7 @@ package posposet
 import (
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/posposet/wire"
 )
 
@@ -101,7 +102,7 @@ func (p *Poset) setFrameSaving(f *Frame) {
 		if f.Index > p.state.LastFinishedFrameN {
 			p.store.SetFrame(f)
 		} else {
-			log.Fatalf("frame %d is finished and should not be changed", f.Index)
+			logger.Log.Fatalf("frame %d is finished and should not be changed", f.Index)
 		}
 	}
 }
diff --git a/src/posposet/frames.go b/src/posposet/frames.go
index 8c3064786..d35c16ad4 100644
--- a/src/posposet/frames.go
+++ b/src/posposet/frames.go
@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // eventsByFrame maps frame num --> roots.
@@ -66,7 +67,7 @@ func (p *Poset) FrameOfEvent(event hash.Event) (frame *Frame, isRoot bool) {
 // frame finds or creates frame.
 func (p *Poset) frame(n uint64, orCreate bool) *Frame {
 	if n < p.state.LastFinishedFrameN && orCreate {
-		log.Fatalf("too old frame %d is requested", n)
+		logger.Log.Fatalf("too old frame %d is requested", n)
 	}
 	// return ephemeral
 	if n == 0 {
diff --git a/src/posposet/input.go b/src/posposet/input.go
index 941f2193d..f618e39f6 100644
--- a/src/posposet/input.go
+++ b/src/posposet/input.go
@@ -3,6 +3,7 @@ package posposet
 import (
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 type EventSource interface {
@@ -23,7 +24,7 @@ func (p *Poset) HasEvent(h hash.Event) bool {
 func (p *Poset) GetEvent(h hash.Event) *Event {
 	e := p.input.GetEvent(h)
 	if e == nil {
-		log.Fatal("got unsaved event")
+		logger.Log.Fatal("got unsaved event")
 	}
 	return &Event{
 		Event: *e,
diff --git a/src/posposet/log.go b/src/posposet/log.go
deleted file mode 100644
index 085a1041c..000000000
--- a/src/posposet/log.go
+++ /dev/null
@@ -1,22 +0,0 @@
-package posposet
-
-import (
-	"github.com/sirupsen/logrus"
-)
-
-var (
-	log *logrus.Logger
-)
-
-func init() {
-	log = logrus.StandardLogger()
-	log.SetLevel(logrus.DebugLevel)
-}
-
-// SetLogger sets logger for whole package.
-func SetLogger(custom *logrus.Logger) {
-	if custom == nil {
-		panic("Nil-logger set")
-	}
-	log = custom
-}
diff --git a/src/posposet/poset.go b/src/posposet/poset.go
index dbd443658..0d6e412ce 100644
--- a/src/posposet/poset.go
+++ b/src/posposet/poset.go
@@ -4,11 +4,9 @@ import (
 	"sort"
 	"sync"
 
-	"github.com/sirupsen/logrus"
-
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
-	"github.com/Fantom-foundation/go-lachesis/src/utils"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 // Poset processes events to get consensus.
@@ -29,7 +27,7 @@ type Poset struct {
 
 // New creates Poset instance.
 // It does not start any process.
-func New(store *Store, input EventSource, logLevel string) *Poset {
+func New(store *Store, input EventSource) *Poset {
 	const buffSize = 10
 
 	p := &Poset{
@@ -41,10 +39,6 @@ func New(store *Store, input EventSource, logLevel string) *Poset {
 		incompleteEvents: make(map[hash.Event]*Event),
 	}
 
-	log = logrus.StandardLogger()
-	log.SetLevel(utils.GetLogLevel(logLevel))
-	SetLogger(log)
-
 	return p
 }
 
@@ -92,7 +86,7 @@ func (p *Poset) PushEvent(e hash.Event) {
 // onNewEvent runs consensus calc from new event. It is not safe for concurrent use.
 func (p *Poset) onNewEvent(e *Event) {
 	if p.store.GetEventFrame(e.Hash()) != nil {
-		log.WithField("event", e).Warnf("Event had received already")
+		logger.Log.WithField("event", e).Warnf("Event had received already")
 		return
 	}
 
@@ -195,7 +189,7 @@ func (p *Poset) consensus(e *Event) {
 	applyRewards(state, ordered)
 	balances, err := state.Commit(true)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	if applyAt.SetBalances(balances) {
 		p.reconsensusFromFrame(applyAt.Index)
@@ -226,7 +220,7 @@ func (p *Poset) checkIfRoot(e *Event) *Frame {
 		if !parent.IsZero() {
 			frame, isRoot := p.FrameOfEvent(parent)
 			if frame == nil || frame.Index <= p.state.LastFinishedFrameN {
-				log.Warnf("Parent %s of %s is too old. Skipped", parent.String(), e.String())
+				logger.Log.Warnf("Parent %s of %s is too old. Skipped", parent.String(), e.String())
 				// NOTE: is it possible some participants got this event before parent outdated?
 				continue
 			}
diff --git a/src/posposet/poset_atropos_test.go b/src/posposet/poset_atropos_test.go
index 87c991cad..73a7a2afb 100644
--- a/src/posposet/poset_atropos_test.go
+++ b/src/posposet/poset_atropos_test.go
@@ -104,7 +104,7 @@ func testSpecialNamedAtropos(t *testing.T, tryRestoring bool, asciiScheme string
 		n++
 		if tryRestoring && n == len(names)*2/3 {
 			ee := p.incompleteEvents
-			p = New(store, input, "debug")
+			p = New(store, input)
 			p.Bootstrap()
 			for _, e := range ee {
 				input.SetEvent(&e.Event)
diff --git a/src/posposet/state.go b/src/posposet/state.go
index f2a7498e2..b58ec8c17 100644
--- a/src/posposet/state.go
+++ b/src/posposet/state.go
@@ -2,6 +2,7 @@ package posposet
 
 import (
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/posposet/wire"
 )
 
@@ -55,7 +56,7 @@ func (p *Poset) Bootstrap() {
 	// restore state
 	p.state = p.store.GetState()
 	if p.state == nil {
-		log.Fatal("Apply genesis for store first")
+		logger.Log.Fatal("Apply genesis for store first")
 	}
 	// restore frames
 	for n := p.state.LastFinishedFrameN; true; n++ {
@@ -75,7 +76,7 @@ func GenesisHash(balances map[hash.Peer]uint64) hash.Hash {
 	defer s.Close()
 
 	if err := s.ApplyGenesis(balances); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 
 	return s.GetState().Genesis
diff --git a/src/posposet/store.go b/src/posposet/store.go
index 8c3a04968..29a7a906c 100644
--- a/src/posposet/store.go
+++ b/src/posposet/store.go
@@ -8,6 +8,7 @@ import (
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/kvdb"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/posposet/wire"
 	"github.com/Fantom-foundation/go-lachesis/src/state"
 )
@@ -64,7 +65,7 @@ func (s *Store) initCache() {
 	cache := func() *lru.Cache {
 		c, err := lru.New(cacheSize)
 		if err != nil {
-			log.Fatal(err)
+			logger.Log.Fatal(err)
 		}
 		return c
 	}
@@ -129,7 +130,7 @@ func (s *Store) SetEventFrame(e hash.Event, frame uint64) {
 	key := e.Bytes()
 	val := intToBytes(frame)
 	if err := s.event2frame.Put(key, val); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 
 	if s.event2frameCache != nil {
@@ -149,7 +150,7 @@ func (s *Store) GetEventFrame(e hash.Event) *uint64 {
 	key := e.Bytes()
 	buf, err := s.event2frame.Get(key)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	if buf == nil {
 		return nil
@@ -215,7 +216,7 @@ func (s *Store) GetBlock(n uint64) *Block {
 func (s *Store) StateDB(from hash.Hash) *state.DB {
 	db, err := state.New(from, s.balances)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	return db
 }
@@ -228,18 +229,18 @@ func (s *Store) set(table kvdb.Database, key []byte, val proto.Message) {
 	var pbf proto.Buffer
 
 	if err := pbf.Marshal(val); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 
 	if err := table.Put(key, pbf.Bytes()); err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 }
 
 func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Message {
 	buf, err := table.Get(key)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	if buf == nil {
 		return nil
@@ -247,7 +248,7 @@ func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Mes
 
 	err = proto.Unmarshal(buf, to)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	return to
 }
@@ -255,7 +256,7 @@ func (s *Store) get(table kvdb.Database, key []byte, to proto.Message) proto.Mes
 func (s *Store) has(table kvdb.Database, key []byte) bool {
 	res, err := table.Has(key)
 	if err != nil {
-		log.Fatal(err)
+		logger.Log.Fatal(err)
 	}
 	return res
 }
diff --git a/src/posposet/store_test.go b/src/posposet/store_test.go
index b45eb3eb5..514e22ce6 100644
--- a/src/posposet/store_test.go
+++ b/src/posposet/store_test.go
@@ -84,7 +84,7 @@ func benchPoset(nodes []hash.Peer, input EventSource, store *Store, cached bool)
 		panic(err)
 	}
 
-	poset := New(store, input, "debug")
+	poset := New(store, input)
 	poset.Bootstrap()
 
 	return poset
diff --git a/src/posposet/time.go b/src/posposet/time.go
index 6e82d93cc..05d8fdef0 100644
--- a/src/posposet/time.go
+++ b/src/posposet/time.go
@@ -5,6 +5,7 @@ import (
 
 	"github.com/Fantom-foundation/go-lachesis/src/hash"
 	"github.com/Fantom-foundation/go-lachesis/src/inter"
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 )
 
 type (
@@ -85,7 +86,7 @@ func newLamportTimeValidator(e *Event) *lamportTimeValidator {
 
 func (v *lamportTimeValidator) IsGreaterThan(time inter.Timestamp) bool {
 	if v.event.LamportTime <= time {
-		log.Warnf("Event %s has lamport time %d. It isn't next of parents, so rejected",
+		logger.Log.Warnf("Event %s has lamport time %d. It isn't next of parents, so rejected",
 			v.event.Hash().String(),
 			v.event.LamportTime)
 		return false
@@ -98,7 +99,7 @@ func (v *lamportTimeValidator) IsGreaterThan(time inter.Timestamp) bool {
 
 func (v *lamportTimeValidator) IsSequential() bool {
 	if v.event.LamportTime != v.maxTime+1 {
-		log.Warnf("Event %s has lamport time %d. It is too far from parents, so rejected",
+		logger.Log.Warnf("Event %s has lamport time %d. It is too far from parents, so rejected",
 			v.event.Hash().String(),
 			v.event.LamportTime)
 		return false
diff --git a/src/posposet/transaction.go b/src/posposet/transaction.go
index bf7382a2b..3b87aa82f 100644
--- a/src/posposet/transaction.go
+++ b/src/posposet/transaction.go
@@ -9,6 +9,7 @@ and the payment of all rewards.
 */
 
 import (
+	"github.com/Fantom-foundation/go-lachesis/src/logger"
 	"github.com/Fantom-foundation/go-lachesis/src/state"
 )
 
@@ -32,7 +33,7 @@ func applyTransactions(db *state.DB, ordered Events) {
 			receiver := tx.Receiver
 
 			if db.FreeBalance(sender) < tx.Amount {
-				log.Warnf("Cannot send %d from %s to %s: balance is insufficient, skipped", tx.Amount, sender.String(), receiver.String())
+				logger.Log.Warnf("Cannot send %d from %s to %s: balance is insufficient, skipped", tx.Amount, sender.String(), receiver.String())
 				continue
 			}
 
diff --git a/src/utils/util.go b/src/utils/util.go
index 7ad216fcb..c318fbbbe 100644
--- a/src/utils/util.go
+++ b/src/utils/util.go
@@ -6,8 +6,6 @@ import (
 	"strconv"
 	"sync/atomic"
 	"testing"
-
-	"github.com/sirupsen/logrus"
 )
 
 var startBase uint32 = 12000
@@ -77,24 +75,3 @@ func FreePort(network string) (port uint16) {
 	}()
 	return uint16(l.Addr().(*net.TCPAddr).Port)
 }
-
-// GetLogLevel return logrus.Level by string.
-// Example: "debug" -> logrus.DebugLevel and etc.
-func GetLogLevel(l string) logrus.Level {
-	switch l {
-	case "debug":
-		return logrus.DebugLevel
-	case "info":
-		return logrus.InfoLevel
-	case "warn":
-		return logrus.WarnLevel
-	case "error":
-		return logrus.ErrorLevel
-	case "fatal":
-		return logrus.FatalLevel
-	case "panic":
-		return logrus.PanicLevel
-	default:
-		return logrus.DebugLevel
-	}
-}

From e00476da9168aee2129fd7a068b0c770b155b43f Mon Sep 17 00:00:00 2001
From: devintegral2 <devintegral2@sfxdx.ru>
Date: Tue, 21 May 2019 17:08:35 +0700
Subject: [PATCH 4/5] Fix fmt.

---
 cmd/dummy/commands/root.go      | 2 +-
 cmd/dummy_client/main.go        | 2 +-
 src/lachesis/lachesis_config.go | 2 +-
 src/logger/logger.go            | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/cmd/dummy/commands/root.go b/cmd/dummy/commands/root.go
index 3db62160f..911400155 100644
--- a/cmd/dummy/commands/root.go
+++ b/cmd/dummy/commands/root.go
@@ -134,4 +134,4 @@ func logLevel(l string) logrus.Level {
 	default:
 		return logrus.DebugLevel
 	}
-}
\ No newline at end of file
+}
diff --git a/cmd/dummy_client/main.go b/cmd/dummy_client/main.go
index 618dce3a2..32d86acba 100644
--- a/cmd/dummy_client/main.go
+++ b/cmd/dummy_client/main.go
@@ -129,4 +129,4 @@ func logLevel(l string) logrus.Level {
 	default:
 		return logrus.DebugLevel
 	}
-}
\ No newline at end of file
+}
diff --git a/src/lachesis/lachesis_config.go b/src/lachesis/lachesis_config.go
index 5d3aa987f..8533b2101 100644
--- a/src/lachesis/lachesis_config.go
+++ b/src/lachesis/lachesis_config.go
@@ -127,4 +127,4 @@ func LogLevel(l string) logrus.Level {
 	default:
 		return logrus.DebugLevel
 	}
-}
\ No newline at end of file
+}
diff --git a/src/logger/logger.go b/src/logger/logger.go
index 72e8af502..a680bbb71 100644
--- a/src/logger/logger.go
+++ b/src/logger/logger.go
@@ -45,4 +45,4 @@ func GetLevel(l string) logrus.Level {
 	default:
 		return logrus.DebugLevel
 	}
-}
\ No newline at end of file
+}

From 50af942f198189cb789fb1d12061e17036a89856 Mon Sep 17 00:00:00 2001
From: devintegral2 <devintegral2@sfxdx.ru>
Date: Thu, 23 May 2019 09:55:28 +0700
Subject: [PATCH 5/5] Add desc.

---
 src/logger/logger.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/logger/logger.go b/src/logger/logger.go
index a680bbb71..200018282 100644
--- a/src/logger/logger.go
+++ b/src/logger/logger.go
@@ -9,6 +9,7 @@ import (
  */
 
 var (
+	// Log - global logger
 	Log *logrus.Logger
 )