logging options added

options.go

@@ -1,6 +1,11 @@
 package rabbit
 
-import "time"
+import (
+	"io"
+	"log"
+	"os"
+	"time"
+)
 
 type Option func(*options)
 
@@ -39,3 +44,17 @@ func WithConsumerBurstSize(t int) Option {
 		op.consumerBurstSize = t
 	}
 }
+
+func WithLogger(l *log.Logger) Option {
+	return func(op *options) { op.logger = l }
+}
+
+func WithLogging(enabled bool) Option {
+	return func(op *options) {
+		if enabled {
+			op.logger = log.New(os.Stdout, "", log.LstdFlags)
+		} else {
+			op.logger = log.New(io.Discard, "", 0)
+		}
+	}
+}