get.go

package api

import (

    "net/http"

    "fmt"

    "io/ioutil"

)

const bufferSize = 512 * 1024

//获取空间文件

func Get(host string, port int, vid uint64, fid uint64, filename string) ([]byte, error) {

    url := fmt.Sprintf("http://%s:%d/%d/%d/%s", host, port, vid, fid, filename)

    resp, err := http.Get(url)

    if err != nil {

        return nil, err

    }

    defer resp.Body.Close()

    if resp.StatusCode == http.StatusOK {

        return ioutil.ReadAll(resp.Body)

    }else {

        return nil, fmt.Errorf("%d != 200", resp.StatusCode)

    }

}

//获取空间文件   指定字节区间

func GetRange(host string, port int, vid uint64, fid uint64, filename string, start int, length int) ([]byte, error) {

    url := fmt.Sprintf("http://%s:%d/%d/%d/%s", host, port, vid, fid, filename)

    req, _ := http.NewRequest(http.MethodGet, url, nil)

    req.Header.Set("Range", fmt.Sprintf("bytes=%d-%d", start, start + length - 1))

    resp, err := http.DefaultClient.Do(req)

    if err != nil {

        return nil, err

    }

    defer resp.Body.Close()

    if resp.StatusCode == http.StatusPartialContent {

        return ioutil.ReadAll(resp.Body)

    }else {

        return nil, fmt.Errorf("%d != 200", resp.StatusCode)

    }

}