gin入门教程（7）：使用 Logrus + Lumberjack 创建日志中间件

结合 Logrus 和 Lumberjack，可以创建一个高效的日志中间件，用于记录请求和响应。以下是实现步骤：

1. 安装依赖

首先，确保安装了 Logrus 和 Lumberjack：

go get github.com/sirupsen/logrus
go get gopkg.in/natefinch/lumberjack.v2

2. 创建日志中间件

创建一个日志中间件，使用 Logrus 记录请求信息，并使用 Lumberjack 实现日志轮转：

package mainimport ("github.com/gin-gonic/gin""github.com/sirupsen/logrus""gopkg.in/natefinch/lumberjack.v2""net/http"
)func SetupLogger() *logrus.Logger {logger := logrus.New()logger.SetOutput(&lumberjack.Logger{Filename:   "log/gin.log",MaxSize:    10, // MBMaxBackups: 3,MaxAge:     28, // daysCompress:   true,})logger.SetFormatter(&logrus.TextFormatter{FullTimestamp: true,})return logger
}func LoggerMiddleware(logger *logrus.Logger) gin.HandlerFunc {return func(c *gin.Context) {logger.WithFields(logrus.Fields{"method": c.Request.Method,"path":   c.Request.URL.Path,}).Info("Request received")c.Next() // 继续处理请求logger.WithFields(logrus.Fields{"status": c.Writer.Status(),"method": c.Request.Method,"path":   c.Request.URL.Path,}).Info("Response sent")}
}

3. 使用中间件

在主函数中注册日志中间件：

func main() {r := gin.Default()logger := SetupLogger()r.Use(LoggerMiddleware(logger))r.GET("/ping", func(c *gin.Context) {c.JSON(http.StatusOK, gin.H{"message": "pong"})})r.Run(":8080")
}

以下是汇总后的完整代码，包括使用 Logrus 和 Lumberjack 创建日志中间件的实现：

package mainimport ("github.com/gin-gonic/gin""github.com/sirupsen/logrus""gopkg.in/natefinch/lumberjack.v2""net/http"
)// 设置 Logger
func SetupLogger() *logrus.Logger {logger := logrus.New()logger.SetOutput(&lumberjack.Logger{Filename:   "log/gin.log",MaxSize:    10, // MBMaxBackups: 3,MaxAge:     28, // daysCompress:   true,})logger.SetFormatter(&logrus.TextFormatter{FullTimestamp: true,})return logger
}// 日志中间件
func LoggerMiddleware(logger *logrus.Logger) gin.HandlerFunc {return func(c *gin.Context) {logger.WithFields(logrus.Fields{"method": c.Request.Method,"path":   c.Request.URL.Path,}).Info("Request received")c.Next() // 继续处理请求logger.WithFields(logrus.Fields{"status": c.Writer.Status(),"method": c.Request.Method,"path":   c.Request.URL.Path,}).Info("Response sent")}
}func main() {r := gin.Default()logger := SetupLogger()r.Use(LoggerMiddleware(logger))r.GET("/ping", func(c *gin.Context) {c.JSON(http.StatusOK, gin.H{"message": "pong"})})r.Run(":8080")
}