From df82184cee45c0dbbf859f74c78fd7aba0ba350e Mon Sep 17 00:00:00 2001
From: wbflooksky <wbflooksky@163.com>
Date: Mon, 20 Feb 2023 22:37:09 +0800
Subject: [PATCH] feat: The abstract log interface facilitates external access
 to logs.

---
 config.go        | 3 +--
 logging.go       | 4 ++++
 memberlist.go    | 2 +-
 net_transport.go | 5 ++---
 4 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/config.go b/config.go
index 3d9100153..93fa25fef 100644
--- a/config.go
+++ b/config.go
@@ -6,7 +6,6 @@ package memberlist
 import (
 	"fmt"
 	"io"
-	"log"
 	"net"
 	"os"
 	"strings"
@@ -224,7 +223,7 @@ type Config struct {
 	// this for the internal logger. If Logger is not set, it will fall back to the
 	// behavior for using LogOutput. You cannot specify both LogOutput and Logger
 	// at the same time.
-	Logger *log.Logger
+	Logger Logger
 
 	// Size of Memberlist's internal channel which handles UDP messages. The
 	// size of this determines the size of the queue which Memberlist will keep
diff --git a/logging.go b/logging.go
index f9d5f0fb2..c5b7937cf 100644
--- a/logging.go
+++ b/logging.go
@@ -8,6 +8,10 @@ import (
 	"net"
 )
 
+type Logger interface {
+	Printf(format string, v ...interface{})
+}
+
 func LogAddress(addr net.Addr) string {
 	if addr == nil {
 		return "from=<unknown address>"
diff --git a/memberlist.go b/memberlist.go
index 6d5f4a703..ad706c22e 100644
--- a/memberlist.go
+++ b/memberlist.go
@@ -80,7 +80,7 @@ type Memberlist struct {
 
 	broadcasts *TransmitLimitedQueue
 
-	logger *log.Logger
+	logger Logger
 
 	// metricLabels is the slice of labels to put on all emitted metrics
 	metricLabels []metrics.Label
diff --git a/net_transport.go b/net_transport.go
index 5d3a8f4c5..17ae6c8f2 100644
--- a/net_transport.go
+++ b/net_transport.go
@@ -7,7 +7,6 @@ import (
 	"bytes"
 	"fmt"
 	"io"
-	"log"
 	"net"
 	"sync"
 	"sync/atomic"
@@ -37,7 +36,7 @@ type NetTransportConfig struct {
 	BindPort int
 
 	// Logger is a logger for operator messages.
-	Logger *log.Logger
+	Logger Logger
 
 	// MetricLabels is a map of optional labels to apply to all metrics
 	// emitted by this transport.
@@ -50,7 +49,7 @@ type NetTransport struct {
 	config       *NetTransportConfig
 	packetCh     chan *Packet
 	streamCh     chan net.Conn
-	logger       *log.Logger
+	logger       Logger
 	wg           sync.WaitGroup
 	tcpListeners []*net.TCPListener
 	udpListeners []*net.UDPConn