golang 框架中文件上传的速度优化技巧

package main

import (
    "fmt"
    "io"
    "net/http"
    "os"

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

func main() {
    r := gin.Default()
    r.POST("/upload", func(c *gin.Context) {
        // 限制文件大小为 10MB
        c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, 10<<20)

        // 获取文件头
        file, header, err := c.Request.FormFile("file")
        if err != nil {
            c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
            return
        }

        // 打开文件并在内存中映射
        f, err := os.OpenFile(header.Filename, os.O_RDWR, 0666)
        if err != nil {
            c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
            return
        }
        defer f.Close()

        mm, err := mmap.Map(f, mmap.RDWR, 0)
        if err != nil {
            c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
            return
        }

        // 保存文件到存储系统
        // .....

        // 解除内存映射
        mmap.Unmap(mm)

        c.JSON(http.StatusOK, gin.H{"status": "ok"})
    })

    r.Run()
}