added Null Logger

pkg/plugins/logger/logrus.go

@@ -7,7 +7,7 @@ import (
 	log "github.com/sirupsen/logrus"
 )
 
-// Logrus uses github.com/sirupsen/logrus to log messages
+// Logrus uses github.com/sirupsen/logrus to log messages. Implements gornir.Logger Interface
 type Logrus struct {
 	logger *log.Entry
 }
@@ -24,26 +24,33 @@ func NewLogrus(debug bool) *Logrus {
 	logger.SetOutput(os.Stdout)
 	return &Logrus{logger: log.NewEntry(logger)}
 }
+
+// WithField implements gornir.Logger interface
 func (l *Logrus) WithField(field string, value interface{}) gornir.Logger {
 	return &Logrus{logger: l.logger.WithFields(log.Fields{field: value})}
 }
 
+// Info implements gornir.Logger interface
 func (l *Logrus) Info(args ...interface{}) {
 	l.logger.Info(args...)
 }
 
+// Debug implements gornir.Logger interface
 func (l *Logrus) Debug(args ...interface{}) {
 	l.logger.Debug(args...)
 }
 
+// Error implements gornir.Logger interface
 func (l *Logrus) Error(args ...interface{}) {
 	l.logger.Error(args...)
 }
 
+// Warn implements gornir.Logger interface
 func (l *Logrus) Warn(args ...interface{}) {
 	l.logger.Warn(args...)
 }
 
+// Fatal implements gornir.Logger interface
 func (l *Logrus) Fatal(args ...interface{}) {
 	l.logger.Fatal(args...)
 }

pkg/plugins/logger/null.go

@@ -0,0 +1,39 @@
+package logger
+
+import (
+	"github.com/nornir-automation/gornir/pkg/gornir"
+)
+
+// Null is a logger that doesn't do anything. Implements gornir.Logger interface
+type Null struct {
+}
+
+// NewNull instantiates a new Null logger
+func NewNull() *Null {
+	return &Null{}
+}
+
+// WithField implements gornir.Logger interface
+func (n *Null) WithField(field string, value interface{}) gornir.Logger {
+	return n
+}
+
+// Info implements gornir.Logger interface
+func (n *Null) Info(args ...interface{}) {
+}
+
+// Debug implements gornir.Logger interface
+func (n *Null) Debug(args ...interface{}) {
+}
+
+// Error implements gornir.Logger interface
+func (n *Null) Error(args ...interface{}) {
+}
+
+// Warn implements gornir.Logger interface
+func (n *Null) Warn(args ...interface{}) {
+}
+
+// Fatal implements gornir.Logger interface
+func (n *Null) Fatal(args ...interface{}) {
+}