日志中request body 为空

logger 中间件中，打印出来的Request Body 一直是为空，其实是因为因为在控制器中对request body已经读取了一次，在中间件中再读取，就读取不到了。现在网上比较主流一点的解决方式是将request body处理一下，代码如下：

package middlewares

import (
    "bytes"
    "io/ioutil"
    "time"

    "github.com/gin-gonic/gin"
    "github.com/spf13/cast"
    "go.uber.org/zap"
    "gohub/passport/pkg/helpers"
    "gohub/passport/pkg/logger"
)

type responseBodyWriter struct {
    gin.ResponseWriter
    body *bytes.Buffer
}

// Write 重写gin.ResponseWriter Write方法
func (r responseBodyWriter) Write(b []byte) (int, error) {
    r.body.Write(b)
    return r.ResponseWriter.Write(b)
}

func Logger() gin.HandlerFunc {
    return func(c *gin.Context) {

        // 获取response 内容
        w := &responseBodyWriter{body: &bytes.Buffer{}, ResponseWriter: c.Writer}
        c.Writer = w

        // 获取request body
        reqeustBody, _ := c.GetRawData()
        // 解决不可重复读body的问题
        c.Request.Body = ioutil.NopCloser(bytes.NewBuffer(reqeustBody))

        // 设置开始时间
        start := time.Now()
        c.Next()

        // 开始记录日志逻辑
        cost := time.Since(start)
        responseStatus := c.Writer.Status()

        logFields := []zap.Field{
            zap.Int("status", c.Writer.Status()),
            zap.String("request", c.Request.Method+" "+c.Request.URL.String()),
            zap.String("query", c.Request.URL.RawQuery),
            zap.String("ip", c.ClientIP()),
            zap.String("user-agent", c.Request.UserAgent()),
            zap.String("errors", c.Errors.ByType(gin.ErrorTypePrivate).String()),
            zap.String("time", helpers.MicrosecondsStr(cost)),
        }

        if c.Request.Method == "POST" || c.Request.Method == "PUT" || c.Request.Method == "DELETE" {
            // 请求的内容
            logFields = append(logFields, zap.String("Request Body", string(reqeustBody)))

            // 响应的内容
            logFields = append(logFields, zap.String("Response Body", w.body.String()))
        }

        if responseStatus > 400 && responseStatus <= 499 {
            // 除了 StatusBadRequest 以外，warning 提示一下，常见的有 403 404，开发时都要注意
            logger.Warn("HTTP Warning "+cast.ToString(responseStatus), logFields...)
        } else if responseStatus >= 500 && responseStatus <= 599 {
            // 除了内部错误，记录 error
            logger.Error("HTTP Error "+cast.ToString(responseStatus), logFields...)
        } else {
            logger.Debug("HTTP Access Log", logFields...)
        }
    }
}

欢迎其他大佬有更优雅的处理方式