@@ -13,8 +13,8 @@ cryptoUtils "github.com/iden3/go-iden3-crypto/utils"
 )
 
 const (
-	// NLEAFELEMS is the number of elements for a leaf
-	NLEAFELEMS = 4
+	// NLeafElems is the number of elements for a leaf
+	NLeafElems = 4
 	// maxNonceValue is the maximum value that the Account.Nonce can have (40 bits: maxNonceValue=2**40-1)
 	maxNonceValue = 0xffffffffff
 	// maxBalanceBytes is the maximum bytes that can use the Account.Balance *big.Int
@@ -41,8 +41,8 @@ return buf.String()
 }
 
 // Bytes returns the bytes representing the Account, in a way that each BigInt is represented by 32 bytes, in spite of the BigInt could be represented in less bytes (due a small big.Int), so in this way each BigInt is always 32 bytes and can be automatically parsed from a byte array.
-func (a *Account) Bytes() ([32 * NLEAFELEMS]byte, error) {
-	var b [32 * NLEAFELEMS]byte
+func (a *Account) Bytes() ([32 * NLeafElems]byte, error) {
+	var b [32 * NLeafElems]byte
 
 	if a.Nonce > maxNonceValue {
 		return b, fmt.Errorf("%s Nonce", ErrNumOverflow)
@@ -69,8 +69,8 @@ return b, nil
 }
 
 // BigInts returns the [5]*big.Int, where each *big.Int is inside the Finite Field
-func (a *Account) BigInts() ([NLEAFELEMS]*big.Int, error) {
-	e := [NLEAFELEMS]*big.Int{}
+func (a *Account) BigInts() ([NLeafElems]*big.Int, error) {
+	e := [NLeafElems]*big.Int{}
 
 	b, err := a.Bytes()
 	if err != nil {
@@ -100,11 +100,11 @@ return v, err
 }
 
 // AccountFromBigInts returns a Account from a [5]*big.Int
-func AccountFromBigInts(e [NLEAFELEMS]*big.Int) (*Account, error) {
+func AccountFromBigInts(e [NLeafElems]*big.Int) (*Account, error) {
 	if !cryptoUtils.CheckBigIntArrayInField(e[:]) {
 		return nil, ErrNotInFF
 	}
-	var b [32 * NLEAFELEMS]byte
+	var b [32 * NLeafElems]byte
 	copy(b[0:32], SwapEndianness(e[0].Bytes())) // SwapEndianness, as big.Int uses BigEndian
 	copy(b[32:64], SwapEndianness(e[1].Bytes()))
 	copy(b[64:96], SwapEndianness(e[2].Bytes()))
@@ -114,7 +114,7 @@ return AccountFromBytes(b)
 }
 
 // AccountFromBytes returns a Account from a byte array
-func AccountFromBytes(b [32 * NLEAFELEMS]byte) (*Account, error) {
+func AccountFromBytes(b [32 * NLeafElems]byte) (*Account, error) {
 	tokenID := binary.LittleEndian.Uint32(b[0:4])
 	var nonceBytes5 [5]byte
 	copy(nonceBytes5[:], b[4:9])

@@ -114,20 +114,20 @@ z := big.NewInt(0)
 
 	// Q-1 should not give error
 	r := new(big.Int).Sub(cryptoConstants.Q, big.NewInt(1))
-	e := [NLEAFELEMS]*big.Int{z, z, r, r}
+	e := [NLeafElems]*big.Int{z, z, r, r}
 	_, err := AccountFromBigInts(e)
 	assert.Nil(t, err)
 
 	// Q should give error
 	r = cryptoConstants.Q
-	e = [NLEAFELEMS]*big.Int{z, z, r, r}
+	e = [NLeafElems]*big.Int{z, z, r, r}
 	_, err = AccountFromBigInts(e)
 	assert.NotNil(t, err)
 	assert.Equal(t, ErrNotInFF, err)
 
 	// Q+1 should give error
 	r = new(big.Int).Add(cryptoConstants.Q, big.NewInt(1))
-	e = [NLEAFELEMS]*big.Int{z, z, r, r}
+	e = [NLeafElems]*big.Int{z, z, r, r}
 	_, err = AccountFromBigInts(e)
 	assert.NotNil(t, err)
 	assert.Equal(t, ErrNotInFF, err)

@@ -16,9 +16,9 @@
 // FeeSelector is used to select a percentage from the FeePlan.
 type FeeSelector uint8
 
-// MAXFEEPLAN is the maximum value of the FeePlan
-const MAXFEEPLAN = 256
+// MaxFeePlan is the maximum value of the FeePlan
+const MaxFeePlan = 256
 
 // FeePlan represents the fee model, a position in the array indicates the
 // percentage of tokens paid in concept of fee for a transaction
-var FeePlan = [MAXFEEPLAN]float64{}
+var FeePlan = [MaxFeePlan]float64{}

@@ -21,19 +21,19 @@ // ErrAccountAlreadyExists is used when CreateAccount is called and the Account
 // already exists
 var ErrAccountAlreadyExists = errors.New("Can not CreateAccount because Account already exists")
 
-// KEYCURRENTBATCH is used as key in the db to store the current BatchNum
-var KEYCURRENTBATCH = []byte("currentbatch")
+// KeyCurrentBatch is used as key in the db to store the current BatchNum
+var KeyCurrentBatch = []byte("currentbatch")
 
-// PATHSTATEDB defines the subpath of the StateDB
-const PATHSTATEDB = "/statedb"
+// PathStateDB defines the subpath of the StateDB
+const PathStateDB = "/statedb"
 
-// PATHBATCHNUM defines the subpath of the Batch Checkpoint in the subpath of
+// PathBatchNum defines the subpath of the Batch Checkpoint in the subpath of
 // the StateDB
-const PATHBATCHNUM = "/BatchNum"
+const PathBatchNum = "/BatchNum"
 
-// PATHCURRENT defines the subpath of the current Batch in the subpath of the
+// PathCurrent defines the subpath of the current Batch in the subpath of the
 // StateDB
-const PATHCURRENT = "/current"
+const PathCurrent = "/current"
 
 // StateDB represents the StateDB object
 type StateDB struct {
@@ -50,7 +50,7 @@ // storage
 func NewStateDB(path string, withMT bool, nLevels int) (*StateDB, error) {
 	var sto *pebble.PebbleStorage
 	var err error
-	sto, err = pebble.NewPebbleStorage(path+PATHSTATEDB+PATHCURRENT, false)
+	sto, err = pebble.NewPebbleStorage(path+PathStateDB+PathCurrent, false)
 	if err != nil {
 		return nil, err
 	}
@@ -64,7 +64,7 @@ }
 	}
 
 	sdb := &StateDB{
-		path: path + PATHSTATEDB,
+		path: path + PathStateDB,
 		db:   sto,
 		mt:   mt,
 	}
@@ -85,7 +85,7 @@ }
 
 // GetCurrentBatch returns the current BatchNum stored in the StateDB
 func (s *StateDB) GetCurrentBatch() (common.BatchNum, error) {
-	cbBytes, err := s.db.Get(KEYCURRENTBATCH)
+	cbBytes, err := s.db.Get(KeyCurrentBatch)
 	if err == db.ErrNotFound {
 		return 0, nil
 	}
@@ -101,7 +101,7 @@ tx, err := s.db.NewTx()
 	if err != nil {
 		return err
 	}
-	tx.Put(KEYCURRENTBATCH, s.currentBatch.Bytes())
+	tx.Put(KeyCurrentBatch, s.currentBatch.Bytes())
 	if err := tx.Commit(); err != nil {
 		return err
 	}
@@ -113,7 +113,7 @@ func (s *StateDB) MakeCheckpoint() error {
 	// advance currentBatch
 	s.currentBatch++
 
-	checkpointPath := s.path + PATHBATCHNUM + strconv.Itoa(int(s.currentBatch))
+	checkpointPath := s.path + PathBatchNum + strconv.Itoa(int(s.currentBatch))
 
 	err := s.setCurrentBatch()
 	if err != nil {
@@ -139,7 +139,7 @@ }
 
 // DeleteCheckpoint removes if exist the checkpoint of the given batchNum
 func (s *StateDB) DeleteCheckpoint(batchNum common.BatchNum) error {
-	checkpointPath := s.path + PATHBATCHNUM + strconv.Itoa(int(batchNum))
+	checkpointPath := s.path + PathBatchNum + strconv.Itoa(int(batchNum))
 
 	if _, err := os.Stat(checkpointPath); os.IsNotExist(err) {
 		return fmt.Errorf("Checkpoint with batchNum %d does not exist in DB", batchNum)
@@ -158,8 +158,8 @@ s.idx = 0
 		return nil
 	}
 
-	checkpointPath := s.path + PATHBATCHNUM + strconv.Itoa(int(batchNum))
-	currentPath := s.path + PATHCURRENT
+	checkpointPath := s.path + PathBatchNum + strconv.Itoa(int(batchNum))
+	currentPath := s.path + PathCurrent
 
 	// remove 'current'
 	err := os.RemoveAll(currentPath)
@@ -217,7 +217,7 @@ accBytes, err := sto.Get(vBytes)
 	if err != nil {
 		return nil, err
 	}
-	var b [32 * common.NLEAFELEMS]byte
+	var b [32 * common.NLeafElems]byte
 	copy(b[:], accBytes)
 	return common.AccountFromBytes(b)
 }
@@ -345,9 +345,9 @@ l.idx = 0
 		return nil
 	}
 
-	synchronizerCheckpointPath := l.synchronizerStateDB.path + PATHBATCHNUM + strconv.Itoa(int(batchNum))
-	checkpointPath := l.path + PATHBATCHNUM + strconv.Itoa(int(batchNum))
-	currentPath := l.path + PATHCURRENT
+	synchronizerCheckpointPath := l.synchronizerStateDB.path + PathBatchNum + strconv.Itoa(int(batchNum))
+	checkpointPath := l.path + PathBatchNum + strconv.Itoa(int(batchNum))
+	currentPath := l.path + PathCurrent
 
 	if fromSynchronizer {
 		// use checkpoint from SynchronizerStateDB

@@ -2,7 +2,6 @@ package log
 
 import (
 	"fmt"
-	"os"
 	"time"
 
 	"go.uber.org/zap"
@@ -10,9 +9,6 @@ "go.uber.org/zap/zapcore"
 )
 
 var log *zap.SugaredLogger
-
-// errorsFile is the file where the errors are being written
-var errorsFile *os.File
 
 func init() {
 	// default level: debug
@@ -20,16 +16,22 @@ Init("debug", "")
 }
 
 // Init the logger with defined level. errorsPath defines the file where to store the errors, if set to "" will not store errors.
-func Init(levelStr, errorsPath string) {
+func Init(levelStr, logPath string) {
 	var level zap.AtomicLevel
 	err := level.UnmarshalText([]byte(levelStr))
 	if err != nil {
 		panic(fmt.Errorf("Error on setting log level: %s", err))
 	}
+	outputPaths := []string{"stdout"}
+	if logPath != "" {
+		log.Infof("log file: %s", logPath)
+		outputPaths = append(outputPaths, logPath)
+	}
+
 	cfg := zap.Config{
 		Level:            level,
 		Encoding:         "console",
-		OutputPaths:      []string{"stdout"},
+		OutputPaths:      outputPaths,
 		ErrorOutputPaths: []string{"stderr"},
 		EncoderConfig: zapcore.EncoderConfig{
 			MessageKey: "message",
@@ -60,25 +62,9 @@ defer logger.Sync()
 	withOptions := logger.WithOptions(zap.AddCallerSkip(1))
 	log = withOptions.Sugar()
 
-	if errorsPath != "" {
-		log.Infof("file where errors will be written: %s", errorsPath)
-		errorsFile, err = os.OpenFile(errorsPath, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0644) //nolint:gosec
-		if err != nil {
-			panic(err)
-		}
-	}
-
 	log.Infof("log level: %s", level)
 }
 
-func writeToErrorsFile(msg string) {
-	if errorsFile == nil {
-		return
-	}
-	//nolint:errcheck
-	errorsFile.WriteString(fmt.Sprintf("%s %s\n", time.Now().Format(time.RFC3339), msg)) //nolint:gosec
-}
-
 // Debug calls log.Debug
 func Debug(args ...interface{}) {
 	log.Debug(args...)
@@ -97,7 +83,6 @@
 // Error calls log.Error and stores the error message into the ErrorFile
 func Error(args ...interface{}) {
 	log.Error(args...)
-	go writeToErrorsFile(fmt.Sprint(args...))
 }
 
 // Debugf calls log.Debugf
@@ -118,5 +103,24 @@
 // Errorf calls log.Errorf and stores the error message into the ErrorFile
 func Errorf(template string, args ...interface{}) {
 	log.Errorf(template, args...)
-	go writeToErrorsFile(fmt.Sprintf(template, args...))
+}
+
+// Debugw calls log.Debugw
+func Debugw(template string, kv ...interface{}) {
+	log.Debugw(template, kv...)
+}
+
+// Infow calls log.Infow
+func Infow(template string, kv ...interface{}) {
+	log.Infow(template, kv...)
+}
+
+// Warnw calls log.Warnw
+func Warnw(template string, kv ...interface{}) {
+	log.Warnw(template, kv...)
+}
+
+// Errorw calls log.Errorw and stores the error message into the ErrorFile
+func Errorw(template string, kv ...interface{}) {
+	log.Errorw(template, kv...)
 }

@@ -5,10 +5,15 @@ "testing"
 )
 
 func TestLog(t *testing.T) {
-	Info("Test log.Infow", "value", 10)
+	// Init("debug", "test.log")
+
+	Info("Test log.Info", " value is ", 10)
 	Infof("Test log.Infof %d", 10)
+	Infow("Test log.Infow", "value", 10)
 	Debugf("Test log.Debugf %d", 10)
-	Error("Test log.Error", "value", 10)
+	Error("Test log.Error", " value is ", 10)
 	Errorf("Test log.Errorf %d", 10)
+	Errorw("Test log.Errorw", "value", 10)
 	Warnf("Test log.Warnf %d", 10)
+	Warnw("Test log.Warnw", "value", 10)
 }

@@ -320,7 +320,7 @@ line, _ := p.s.r.ReadString('\n')
 			c.Literal += line
 			return c, err
 		}
-		if fee > common.MAXFEEPLAN-1 {
+		if fee > common.MaxFeePlan-1 {
 			line, _ := p.s.r.ReadString('\n')
 			c.Literal += line
 			return c, fmt.Errorf("Fee %d can not be bigger than 255", fee)