add logging to the operator

add logging

cmd/logging.go

@@ -0,0 +1,43 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/go-logr/logr"
+	"github.com/go-logr/zapr"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+	"gopkg.in/natefinch/lumberjack.v2"
+)
+
+// CreateFileLogger Create a logger that will write to console, and file along with log rotation
+func CreateFileLogger(fileName string, logLevel zapcore.LevelEnabler) logr.Logger {
+
+	// Create file with desired permissions
+	file, err := os.OpenFile(fileName, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	config := zap.NewProductionEncoderConfig()
+	config.EncodeTime = zapcore.ISO8601TimeEncoder
+	fileEncoder := zapcore.NewJSONEncoder(config)
+	consoleEncoder := zapcore.NewConsoleEncoder(config)
+	writer := zapcore.AddSync(&lumberjack.Logger{
+		Filename:   fileName,
+		MaxSize:    1000, //MB
+		MaxBackups: 3,
+		MaxAge:     90, //days
+		Compress:   false,
+	})
+
+	core := zapcore.NewTee(
+		zapcore.NewCore(fileEncoder, writer, logLevel),
+		zapcore.NewCore(consoleEncoder, zapcore.AddSync(os.Stdout), logLevel),
+	)
+
+	logger := zap.New(core, zap.AddCaller(), zap.AddStacktrace(zapcore.ErrorLevel))
+	return zapr.NewLogger(logger)
+}