Refactoring

1. Move all pre-defined messages to constants in a separate file
2. Remove pkg/errors dependency

pkg/infrastructure/jsonlog/level.go

@@ -1,13 +0,0 @@
-package jsonlog
-
-import "github.com/sirupsen/logrus"
-
-type Level logrus.Level
-
-const (
-	FatalLevel = Level(logrus.FatalLevel)
-	ErrorLevel = Level(logrus.ErrorLevel)
-	WarnLevel  = Level(logrus.WarnLevel)
-	InfoLevel  = Level(logrus.InfoLevel)
-	DebugLevel = Level(logrus.DebugLevel)
-)

pkg/infrastructure/jsonlog/logger.go

@@ -1,55 +0,0 @@
-package jsonlog
-
-import (
-	"time"
-
-	"github.com/sirupsen/logrus"
-)
-
-const appNameKey = "app_name"
-
-var fieldMap = logrus.FieldMap{
-	logrus.FieldKeyTime: "@timestamp",
-	logrus.FieldKeyMsg:  "message",
-}
-
-type Logger interface {
-	WithField(key string, value interface{}) Logger
-
-	Info(...interface{})
-	Error(error, ...interface{})
-	FatalError(error, ...interface{})
-}
-
-type Config struct {
-	AppName string
-	Level   Level
-}
-
-func NewLogger(config *Config) Logger {
-	impl := logrus.New()
-	impl.SetFormatter(&logrus.JSONFormatter{
-		TimestampFormat: time.RFC3339Nano,
-		FieldMap:        fieldMap,
-	})
-	impl.SetLevel(logrus.Level(config.Level))
-	return &logger{
-		FieldLogger: impl.WithField(appNameKey, config.AppName),
-	}
-}
-
-type logger struct {
-	logrus.FieldLogger
-}
-
-func (l *logger) WithField(key string, value interface{}) Logger {
-	return &logger{l.FieldLogger.WithField(key, value)}
-}
-
-func (l *logger) Error(err error, args ...interface{}) {
-	l.FieldLogger.WithError(err).Error(args)
-}
-
-func (l *logger) FatalError(err error, args ...interface{}) {
-	l.FieldLogger.WithError(err).Fatal(args...)
-}