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package main
import (
"bufio"
"fmt"
"io"
"net/http"
"net/url"
"os"
"os/exec"
"strconv"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func DownloadDownloadArtifact(downloadPath, surl string) (err error) {
dfn := downloadPath
var (
file *os.File
size int64
headerMd5sum,
downloadMd5sum string
)
file, err = os.OpenFile(dfn, os.O_RDWR|os.O_CREATE, 0644)
defer file.Close()
if err != nil {
err = errors.Wrapf(err, "download openfile err")
return err
}
stat, _ := file.Stat()
size = stat.Size()
sk, err := file.Seek(size, 0)
if err != nil {
err = errors.Wrapf(err, "seek err")
return err
}
if sk != size {
err = fmt.Errorf("seek length not equal file size,seek=%d,size=%d", sk, size)
logrus.Error(err.Error())
return err
}
request := http.Request{}
request.Method = http.MethodGet
if size != 0 {
header := http.Header{}
header.Set("Range", "bytes="+strconv.FormatInt(size, 10)+"-")
request.Header = header
}
parse, _ := url.Parse(surl)
request.URL = parse
resp, err := http.DefaultClient.Do(&request)
//resp, err := http.DefaultClient.Do(&request)
defer resp.Body.Close()
if err != nil {
err = errors.Wrapf(err, "client do err")
logrus.Error(err.Error())
return err
}
headerMd5sum = resp.Header.Get("Content-Md5")
if headerMd5sum == "" {
return fmt.Errorf("resp header md5sum empty")
}
body := resp.Body
writer := bufio.NewWriter(file)
bs := make([]byte, 1024*1024)
for {
var read int
read, err = body.Read(bs)
if err != nil {
if err != io.EOF {
err = errors.Wrapf(err, "body read not io eof")
logrus.Error(err.Error())
return err
}
if err == io.EOF && resp.StatusCode != http.StatusOK {
err = nil
return
}
if read != 0 {
_, err = writer.Write(bs[:read])
if err != nil {
err = errors.Wrapf(err, "writer write err")
return err
}
}
err = nil
break
}
_, err = writer.Write(bs[:read])
if err != nil {
err = errors.Wrapf(err, "writer write err")
return err
}
}
if err != nil {
return err
}
err = writer.Flush()
if err != nil {
err = errors.Wrapf(err, "writer.Flush err")
return err
}
// 比对 md5 是否一致
downloadMd5sum, err = md5sum(downloadPath)
if err != nil {
err = errors.Wrapf(err, "get download md5dum err")
logrus.Error(err.Error())
// md5 不一致直接删除
os.Remove(downloadPath)
return err
}
logrus.Debugf("downloadMd5sum: %s,headerMd5sum:%s ", downloadMd5sum, headerMd5sum)
if downloadMd5sum == headerMd5sum {
return nil
}
// 错误了删除 tar 包
os.Remove(downloadPath)
return fmt.Errorf("download md5sum not equal header md5dum")
}
func md5sum(downloadPath string) (string, error) {
cmdStr := fmt.Sprintf("printf $(md5sum %s)", downloadPath)
cmdOutput, err := exec.Command("/bin/sh", "-c", cmdStr).CombinedOutput()
logrus.Debugf("md5sum: %s ", cmdStr)
if err != nil {
err = errors.Wrapf(err, "md5sum [%s] exec.Command err", cmdStr)
logrus.Error(err.Error())
return "", err
}
return string(cmdOutput), nil
}
func main() {
err := DownloadDownloadArtifact("/mnt/d/tmp/xxx.111.test", "http://127.0.0.1:8080/download")
if err != nil {
fmt.Println("download err", err.Error())
return
}
fmt.Println("success..........")
}
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