/
file.go
279 lines (243 loc) · 6.59 KB
/
file.go
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package build
import (
"archive/tar"
"archive/zip"
"bufio"
"bytes"
"compress/gzip"
"encoding/hex"
"encoding/json"
"fmt"
"gopkg.in/cheggaaa/pb.v1"
"io"
"log"
"net/http"
"os"
"path/filepath"
"strings"
)
const (
zipMagicHeader = "504b"
gzipMagicHeader = "1f8b"
)
func downloadFile(url string) ([]byte, error) {
var b bytes.Buffer
w := bufio.NewWriter(&b)
err := downloadFileWithProgressBar(url, w)
if err != nil {
return nil, err
}
w.Flush()
return b.Bytes(), nil
}
func downloadFileWithProgressBar(url string, w io.Writer) error {
resp, err := http.Get(url)
if err != nil {
return fmt.Errorf("file download error: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return fmt.Errorf("unexpected response code: %d", resp.StatusCode)
}
contentLength := int(resp.ContentLength)
writer := w
if contentLength > 0 {
bar := pb.New(contentLength).SetUnits(pb.U_BYTES)
bar.Output = os.Stderr
bar.Start()
defer bar.Finish()
writer = io.MultiWriter(w, bar)
}
_, err = io.Copy(writer, resp.Body)
if err != nil {
return fmt.Errorf("failed to save file: %v", err)
}
return nil
}
func downloadDriver(url string, filename string, outputDir string) (string, error) {
log.Printf("downloading driver from %s", url)
data, err := downloadFile(url)
if err != nil {
return "", fmt.Errorf("failed to download driver archive: %v", err)
}
return extractFile(data, filename, outputDir)
}
func getMagicHeader(data []byte) string {
if len(data) >= 2 {
return hex.EncodeToString(data[:2])
}
return ""
}
func isZipFile(data []byte) bool {
return getMagicHeader(data) == zipMagicHeader
}
func isTarGzFile(data []byte) bool {
return getMagicHeader(data) == gzipMagicHeader
}
func extractFile(data []byte, filename string, outputDir string) (string, error) {
if isZipFile(data) {
return unzip(data, filename, outputDir)
} else if isTarGzFile(data) {
return untar(data, filename, outputDir)
} else {
outputPath := filepath.Join(outputDir, filename)
err := os.WriteFile(outputPath, data, os.ModePerm)
if err != nil {
return "", fmt.Errorf("failed to save file %s: %v", outputPath, err)
}
return outputPath, nil
}
}
// Based on http://stackoverflow.com/questions/20357223/easy-way-to-unzip-file-with-golang
func unzip(data []byte, fileName string, outputDir string) (string, error) {
zr, err := zip.NewReader(bytes.NewReader(data), int64(len(data)))
// Closure to address file descriptors issue with all the deferred .Close() methods
extractAndWriteFile := func(f *zip.File) (string, error) {
rc, err := f.Open()
if err != nil {
return "", err
}
defer rc.Close()
outputPath := filepath.Join(outputDir, f.Name)
if f.FileInfo().IsDir() {
return "", fmt.Errorf("can only unzip files but %s is a directory", f.Name)
}
err = outputFile(outputPath, f.Mode(), rc)
if err != nil {
return "", err
}
return outputPath, nil
}
if err == nil {
for _, f := range zr.File {
if f.Name == fileName {
return extractAndWriteFile(f)
}
}
err = fmt.Errorf("file %s does not exist in archive", fileName)
}
return "", err
}
// Based on https://medium.com/@skdomino/taring-untaring-files-in-go-6b07cf56bc07
func untar(data []byte, fileName string, outputDir string) (string, error) {
gzr, err := gzip.NewReader(bytes.NewReader(data))
defer gzr.Close()
extractAndWriteFile := func(tr *tar.Reader, header *tar.Header) (string, error) {
outputPath := filepath.Join(outputDir, header.Name)
if header.Typeflag == tar.TypeDir {
return "", fmt.Errorf("can only untar files but %s is a directory", header.Name)
}
err = outputFile(outputPath, os.FileMode(header.Mode), tr)
if err != nil {
return "", err
}
return outputPath, nil
}
if err == nil {
tr := tar.NewReader(gzr)
loop:
for {
header, err := tr.Next()
switch {
case err == io.EOF:
break loop
case err != nil:
return "", err
case header == nil:
continue
}
return extractAndWriteFile(tr, header)
}
err = fmt.Errorf("file %s does not exist in archive", fileName)
}
return "", err
}
func outputFile(outputPath string, mode os.FileMode, r io.Reader) error {
os.MkdirAll(filepath.Dir(outputPath), 0755)
f, err := os.OpenFile(outputPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, mode)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(f, r)
if err != nil {
return err
}
return nil
}
func doSendGet(url string, token string) ([]byte, error) {
req, err := http.NewRequest(http.MethodGet, url, nil)
if err != nil {
return nil, fmt.Errorf("invalid request: %v", err)
}
if token != "" {
req.Header.Add("Authorization", fmt.Sprintf("token %s", token))
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return nil, fmt.Errorf("request error: %v", err)
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return nil, fmt.Errorf("unsuccessful response: %d %s", resp.StatusCode, resp.Status)
}
data, err := io.ReadAll(resp.Body)
if err != nil {
return nil, fmt.Errorf("read response body: %v", err)
}
return data, nil
}
func sendGet(url string) ([]byte, error) {
return doSendGet(url, "")
}
func sendGetWithAuth(url string, token string) ([]byte, error) {
return doSendGet(url, token)
}
func latestGithubRelease(repo string) (string, error) {
token := os.Getenv("GITHUB_TOKEN")
url := fmt.Sprintf("https://api.github.com/repos/%s/releases/latest", repo)
data, err := sendGetWithAuth(url, token)
if err != nil {
return "", fmt.Errorf("get latest github release data: %v", err)
}
type info struct {
TagName string `json:"tag_name"`
}
var i info
err = json.Unmarshal(data, &i)
if err != nil {
return "", fmt.Errorf("json unmarshal: %v", err)
}
return i.TagName, nil
}
func githubLinuxAssetURL(repo string, version string) (string, error) {
token := os.Getenv("GITHUB_TOKEN")
url := fmt.Sprintf("https://api.github.com/repos/%s/releases", repo)
data, err := sendGetWithAuth(url, token)
if err != nil {
return "", fmt.Errorf("get github releases data: %v", err)
}
type AssetInfo struct {
BrowserDownloadURL string `json:"browser_download_url"`
}
type Release struct {
Assets []AssetInfo `json:"assets"`
}
type Releases []Release
var releases Releases
err = json.Unmarshal(data, &releases)
if err != nil {
return "", fmt.Errorf("json unmarshal: %v", err)
}
for _, release := range releases {
for _, asset := range release.Assets {
if version != LatestVersion && !strings.Contains(asset.BrowserDownloadURL, version) {
continue
}
if strings.Contains(asset.BrowserDownloadURL, "linux") {
return asset.BrowserDownloadURL, nil
}
}
}
return "", fmt.Errorf("could not find github linux asset")
}