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github.go
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github.go
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// Package github implements github utilities.
package github
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"path/filepath"
"reflect"
"runtime"
"strings"
"time"
"github.com/aws/aws-k8s-tester/pkg/fileutil"
"github.com/dustin/go-humanize"
"go.uber.org/zap"
"k8s.io/utils/exec"
)
// Download downloads aws-k8s-tester binary from github release.
func Download(lg *zap.Logger, tag string, fpath string) (string, error) {
if lg == nil {
lg = zap.NewNop()
}
if tag == "" {
tag = "latest"
}
if fpath == "" {
f, err := ioutil.TempFile(os.TempDir(), "aws-k8s-tester")
if err != nil {
return "", err
}
fpath = f.Name()
f.Close()
os.RemoveAll(fpath)
}
fpath, _ = filepath.Abs(fpath)
now := time.Now()
r, err := Query(lg, tag)
if err != nil {
lg.Warn("failed to query release", zap.Error(err))
return fpath, err
}
downloadURL := ""
for _, asset := range r.Assets {
ext := filepath.Ext(asset.Name)
if ext == ".asc" {
continue
}
if asset.ContentType != "application/octet-stream" {
continue
}
if !strings.HasSuffix(asset.Name, runtime.GOOS+"-"+runtime.GOARCH) {
continue
}
downloadURL = asset.BrowserDownloadURL
lg.Info("downloading release", zap.String("name", asset.Name), zap.String("updated-ago", asset.UpdatedAgo))
break
}
if downloadURL == "" {
lg.Warn("failed to find release asset")
return fpath, errors.New("no release asset found")
}
lg.Info("mkdir", zap.String("dir", filepath.Dir(fpath)))
if err := os.MkdirAll(filepath.Dir(fpath), 0700); err != nil {
return fpath, fmt.Errorf("could not create %q (%v)", filepath.Dir(fpath), err)
}
if err := os.RemoveAll(fpath); err != nil {
return fpath, err
}
f, err := os.Create(fpath)
if err != nil {
return fpath, fmt.Errorf("failed to create %q (%v)", fpath, err)
}
if err := httpDownloadFile(lg, downloadURL, f); err != nil {
return fpath, err
}
if err := f.Close(); err != nil {
return fpath, fmt.Errorf("failed to close %v", err)
}
if err := fileutil.EnsureExecutable(fpath); err != nil {
// file may be already executable while the process does not own the file/directory
// ref. https://github.com/aws/aws-k8s-tester/issues/66
lg.Warn("failed to ensure executable", zap.Error(err))
err = nil
}
// aws-iam-authenticator version
ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
co, err := exec.New().CommandContext(
ctx,
fpath,
"version",
).CombinedOutput()
cancel()
if err != nil {
return fpath, fmt.Errorf("'aws-k8s-tester version' failed (output %q, error %v)", string(co), err)
}
st, err := os.Stat(fpath)
lg.Info(
"downloaded release",
zap.String("file-path", fpath),
zap.String("version", string(co)),
zap.String("size", humanize.Bytes(uint64(st.Size()))),
zap.String("took", humanize.Time(now)),
zap.Error(err),
)
return fpath, nil
}
// Query fetches github release information.
// ref. https://developer.github.com/v3/repos/releases
// e.g.
// https://api.github.com/repos/aws/aws-k8s-tester/releases/latest
// https://api.github.com/repos/aws/aws-k8s-tester/releases/tags/v0.8.5
func Query(lg *zap.Logger, tag string) (*Release, error) {
if lg == nil {
lg = zap.NewNop()
}
if tag == "" {
tag = "latest"
}
url := fmt.Sprintf("https://api.github.com/repos/aws/aws-k8s-tester/releases/tags/%s", tag)
if tag == "latest" {
url = "https://api.github.com/repos/aws/aws-k8s-tester/releases/latest"
}
lg.Info("querying release", zap.String("url", url))
buf := bytes.NewBuffer(nil)
if err := httpReadInsecure(lg, url, buf); err != nil {
return nil, err
}
r := &Release{}
if err := json.NewDecoder(buf).Decode(r); err != nil {
return nil, err
}
now := time.Now().UTC()
now = time.Date(now.Year(), now.Month(), now.Day(), now.Hour(), now.Minute(), 0, 0, now.Location())
r.PublishedAgo = humanize.RelTime(r.PublishedAt, now, "ago", "from now")
for i := range r.Assets {
r.Assets[i].CreatedAgo = humanize.RelTime(r.Assets[i].CreatedAt, now, "ago", "from now")
r.Assets[i].UpdatedAgo = humanize.RelTime(r.Assets[i].UpdatedAt, now, "ago", "from now")
r.Assets[i].SizeString = humanize.Bytes(r.Assets[i].Size)
r.TotalAssetsSize += r.Assets[i].Size
}
r.TotalAssetsSizeString = humanize.Bytes(r.TotalAssetsSize)
lg.Info("queried release",
zap.String("release-name", r.Name),
zap.String("tag-name", r.TagName),
zap.String("published", r.PublishedAgo),
zap.Int("assets", len(r.Assets)),
zap.String("total-assets-size", r.TotalAssetsSizeString),
)
return r, nil
}
// Release represents github release.
type Release struct {
HTMLURL string `json:"html_url"`
Name string `json:"name"`
TagName string `json:"tag_name"`
Assets []Asset `json:"assets"`
PublishedAt time.Time `json:"published_at"`
PublishedAgo string
TotalAssetsSize uint64
TotalAssetsSizeString string
}
// Asset represents github release assets.
type Asset struct {
Name string `json:"name"`
BrowserDownloadURL string `json:"browser_download_url"`
ContentType string `json:"content_type"`
Size uint64 `json:"size"`
SizeString string
DownloadCount int `json:"download_count"`
State string `json:"state"`
CreatedAt time.Time `json:"created_at"`
CreatedAgo string
UpdatedAt time.Time `json:"updated_at"`
UpdatedAgo string
}
// curl -k [URL]
func httpReadInsecure(lg *zap.Logger, u string, wr io.Writer) error {
lg.Info("reading", zap.String("url", u))
cli := &http.Client{
Timeout: 5 * time.Second,
Transport: &http.Transport{
TLSClientConfig: &tls.Config{
InsecureSkipVerify: true,
},
}}
r, err := cli.Get(u)
if err != nil {
return err
}
defer r.Body.Close()
if r.StatusCode >= 400 {
return fmt.Errorf("%q returned %d", u, r.StatusCode)
}
_, err = io.Copy(wr, r.Body)
if err != nil {
lg.Warn("failed to read", zap.String("url", u), zap.Error(err))
} else {
lg.Info("read",
zap.String("url", u),
)
}
return err
}
var httpFileTransport *http.Transport
func init() {
httpFileTransport = new(http.Transport)
httpFileTransport.RegisterProtocol("file", http.NewFileTransport(http.Dir("/")))
}
// curl -L [URL] | writer
func httpDownloadFile(lg *zap.Logger, u string, wr io.Writer) error {
lg.Info("downloading", zap.String("url", u))
cli := &http.Client{Transport: httpFileTransport}
r, err := cli.Get(u)
if err != nil {
return err
}
defer r.Body.Close()
if r.StatusCode >= 400 {
return fmt.Errorf("%q returned %d", u, r.StatusCode)
}
_, err = io.Copy(wr, r.Body)
if err != nil {
lg.Warn("failed to download", zap.String("url", u), zap.Error(err))
} else {
if f, ok := wr.(*os.File); ok {
lg.Info("downloaded",
zap.String("url", u),
zap.String("file-path", f.Name()),
)
} else {
lg.Info("downloaded",
zap.String("url", u),
zap.String("value-of", reflect.ValueOf(wr).String()),
)
}
}
return err
}