Logger interface with implementations (Zap and Logrus)

You can use logger as an interface (example below) and set actual implementation to ReplaceGlobals, this allows you to change log library without changing your application code.

Also, when we create go libraries in general we shouldn't be logging but at times we do have to log, debug what the library is doing or trace the log.

We cannot implement a library with one log library and expect applications to use the same log library. We use two of the popular log libraries logrus and zap and this go-logger library allows you to use either one by using an interface.

You can add your implementation if you want to add more log libraries (e.g. zerolog).

Installation

go get -u github.com/arun0009/go-logger

Quick Start

logrus example

package main

import (
	"os"

	"github.com/arun0009/go-logger/pkg/logger"
	"github.com/sirupsen/logrus"
)

func main() {
	logrusLog := logrus.New()
	logrusLog.SetFormatter(&logrus.JSONFormatter{})
	logrusLog.SetOutput(os.Stdout)
	logrusLog.SetLevel(logrus.DebugLevel)
	log, _ := logger.NewLogrusLogger(logrusLog)
	logger.ReplaceGlobals(log)
        //anywhere in your code you can now use logger.L() as its globally set
	logger.L().WithFields(logger.Fields{
		"foo": "bar",
	}).Info("direct")
}

zap example

package main

import (
	"os"

	"github.com/arun0009/go-logger/pkg/logger"
	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

func main() {
	consoleEncoder := zapcore.NewJSONEncoder(zap.NewDevelopmentEncoderConfig())
	core := zapcore.NewCore(consoleEncoder,
		zapcore.Lock(zapcore.AddSync(os.Stderr)),
		zapcore.DebugLevel)
	zapLogger := zap.New(core)
	log, _ := logger.NewZapLogger(zapLogger)
 	logger.ReplaceGlobals(log)
        //anywhere in your code you can now use logger.L() as its globally set
	logger.L().WithFields(logger.Fields{
		"foo": "bar",
	}).Info("direct")
}