LogFormatterParams.Body reading failed

[fengshunli]

Using LogFormatterParams.Request.Body to read c fails, using ctx.Request.Body in *gin.Context works fine

[JimChenWYU]

// LoggerWithConfig instance a Logger middleware with config.
func LoggerWithConfig(conf LoggerConfig) HandlerFunc {
	formatter := conf.Formatter
	if formatter == nil {
		formatter = defaultLogFormatter
	}
       
        ...

	return func(c *Context) {
		// Start timer
		start := time.Now()
		path := c.Request.URL.Path
		raw := c.Request.URL.RawQuery

		// Process request
		c.Next()
                
                 ...

		fmt.Fprint(out, formatter(param))
	}
}

If you has been read request.Body in your handler, after in logformat middleware will be none.

---

like this

package main

import (
	"fmt"
	"io"

	"github.com/gin-gonic/gin"
)

func main() {
	g := gin.Default()
	g.Use(gin.LoggerWithFormatter(func(params gin.LogFormatterParams) string {
		rc := io.NopCloser(params.Request.Body)
		b, err := io.ReadAll(rc)
		fmt.Println(string(b), err)   // none, because `/test` has been read `Body`.
		return ""
	}))
	g.POST("test", func(c *gin.Context) {
		b, _ := io.ReadAll(c.Request.Body)
		c.String(200, "body: %s", string(b))
	})
	g.Run(":8080")
}