Rename logging package

pkg/logger/logger.go

@@ -0,0 +1,63 @@
+package logger
+
+import (
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+// NewLogger returns a zap sugared logger configured with json format and caller id
+func NewLogger(logLevel string) (*zap.SugaredLogger, error) {
+	return NewLoggerWithEncoding(logLevel, "json")
+}
+
+// NewLoggerWithEncoding returns a zap sugared logger configured with provided format, e.g. console or json, and caller id
+func NewLoggerWithEncoding(logLevel, zapEncoding string) (*zap.SugaredLogger, error) {
+	level := zap.NewAtomicLevelAt(zapcore.InfoLevel)
+	switch logLevel {
+	case "debug":
+		level = zap.NewAtomicLevelAt(zapcore.DebugLevel)
+	case "info":
+		level = zap.NewAtomicLevelAt(zapcore.InfoLevel)
+	case "warn":
+		level = zap.NewAtomicLevelAt(zapcore.WarnLevel)
+	case "error":
+		level = zap.NewAtomicLevelAt(zapcore.ErrorLevel)
+	case "fatal":
+		level = zap.NewAtomicLevelAt(zapcore.FatalLevel)
+	case "panic":
+		level = zap.NewAtomicLevelAt(zapcore.PanicLevel)
+	}
+
+	zapEncoderConfig := zapcore.EncoderConfig{
+		TimeKey:        "ts",
+		LevelKey:       "level",
+		NameKey:        "logger",
+		CallerKey:      "caller",
+		MessageKey:     "msg",
+		StacktraceKey:  "stacktrace",
+		LineEnding:     zapcore.DefaultLineEnding,
+		EncodeLevel:    zapcore.LowercaseLevelEncoder,
+		EncodeTime:     zapcore.ISO8601TimeEncoder,
+		EncodeDuration: zapcore.SecondsDurationEncoder,
+		EncodeCaller:   zapcore.ShortCallerEncoder,
+	}
+
+	zapConfig := zap.Config{
+		Level:       level,
+		Development: false,
+		Sampling: &zap.SamplingConfig{
+			Initial:    100,
+			Thereafter: 100,
+		},
+		Encoding:         zapEncoding,
+		EncoderConfig:    zapEncoderConfig,
+		OutputPaths:      []string{"stderr"},
+		ErrorOutputPaths: []string{"stderr"},
+	}
+
+	logger, err := zapConfig.Build()
+	if err != nil {
+		return nil, err
+	}
+	return logger.Sugar(), nil
+}