Add logger utility with configurable log levels

Implement a logger utility with various log levels.

Author: Kamalesh-Seervi

pkg/utils/logger.go

@@ -0,0 +1,94 @@
+/*
+Copyright © 2021 The LitmusChaos Authors
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+package utils
+
+import (
+	"os"
+
+	"github.com/litmuschaos/litmusctl/pkg/config"
+	"github.com/sirupsen/logrus"
+)
+
+var Log *logrus.Logger
+
+func init() {
+	Log = logrus.New()
+	Log.SetOutput(os.Stdout)
+	Log.SetFormatter(&logrus.TextFormatter{
+		DisableColors: false,
+		FullTimestamp: false,
+	})
+	// Default to Error level; will be set to Debug when verbose mode is enabled
+	Log.SetLevel(logrus.ErrorLevel)
+}
+
+// ConfigureVerboseLogging configures the logger based on verbose mode
+func ConfigureVerboseLogging() {
+	if config.VerboseMode {
+		Log.SetLevel(logrus.DebugLevel)
+		Log.Debug("Verbose mode enabled")
+	} else {
+		Log.SetLevel(logrus.ErrorLevel)
+	}
+}
+
+// Debug logs a message at debug level (only shown in verbose mode)
+func Debug(args ...interface{}) {
+	if config.VerboseMode {
+		Log.Debug(args...)
+	}
+}
+
+// Debugf logs a formatted message at debug level (only shown in verbose mode)
+func Debugf(format string, args ...interface{}) {
+	if config.VerboseMode {
+		Log.Debugf(format, args...)
+	}
+}
+
+// Info logs a message at info level (only shown in verbose mode)
+func Info(args ...interface{}) {
+	if config.VerboseMode {
+		Log.Info(args...)
+	}
+}
+
+// Infof logs a formatted message at info level (only shown in verbose mode)
+func Infof(format string, args ...interface{}) {
+	if config.VerboseMode {
+		Log.Infof(format, args...)
+	}
+}
+
+// Warn logs a warning message (shown regardless of verbose mode)
+func Warn(args ...interface{}) {
+	Log.Warn(args...)
+}
+
+// Warnf logs a formatted warning message (shown regardless of verbose mode)
+func Warnf(format string, args ...interface{}) {
+	Log.Warnf(format, args...)
+}
+
+// Error logs an error message (shown regardless of verbose mode)
+func Error(args ...interface{}) {
+	Log.Error(args...)
+}
+
+// Errorf logs a formatted error message (shown regardless of verbose mode)
+func Errorf(format string, args ...interface{}) {
+	Log.Errorf(format, args...)
+}