logging level in go at runtime

logging_level.go

// Change the logging level curl -X PUT -d '{"level":"debug"}' localhost:8080/logger

package main

import (
	"log"
	"net/http"
	"os"
	"time"

	"go.uber.org/zap"
	"go.uber.org/zap/zapcore"
)

func main() {
	atom := zap.NewAtomicLevel()

	// To keep the example deterministic, disable timestamps in the output.
	encoderCfg := zap.NewProductionEncoderConfig()
	encoderCfg.TimeKey = ""

	logger := zap.New(zapcore.NewCore(
		zapcore.NewJSONEncoder(encoderCfg),
		zapcore.Lock(os.Stdout),
		atom,
	))
	defer logger.Sync()

	go func() {
		for {

			logger.Info("Testing Info")
			logger.Debug("Testing Debug")
			logger.Warn("Testing Warn")
			time.Sleep(5 * time.Second)
		}
	}()
	http.Handle("/logger", atom)
	log.Fatal(http.ListenAndServe(":8080", nil))
}