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|
package http
import (
"context"
"crypto/md5"
"crypto/sha1"
"crypto/sha256"
"crypto/sha512"
"encoding/hex"
"fmt"
"net/http"
"time"
"golang.org/x/time/rate"
"github.com/aptly-dev/aptly/utils"
grab "github.com/cavaliergopher/grab/v3"
"github.com/pkg/errors"
"github.com/aptly-dev/aptly/aptly"
)
type GrabDownloader struct {
client *grab.Client
progress aptly.Progress
maxTries int
downLimit int64
}
// Check interface
var (
_ aptly.Downloader = (*GrabDownloader)(nil)
)
// NewGrabDownloader creates new expected downloader
func NewGrabDownloader(downLimit int64, maxTries int, progress aptly.Progress) *GrabDownloader {
client := grab.NewClient()
return &GrabDownloader{
client: client,
progress: progress,
maxTries: maxTries,
downLimit: downLimit,
}
}
func (d *GrabDownloader) Download(ctx context.Context, url string, destination string) error {
return d.DownloadWithChecksum(ctx, url, destination, nil, false)
}
func (d *GrabDownloader) DownloadWithChecksum(ctx context.Context, url string, destination string, expected *utils.ChecksumInfo, ignoreMismatch bool) error {
maxTries := d.maxTries
// FIXME: const delayMax = time.Duration(5 * time.Minute)
delay := time.Duration(1 * time.Second)
// FIXME: const delayMultiplier = 2
err := fmt.Errorf("no tries available")
for maxTries > 0 {
err = d.download(ctx, url, destination, expected, ignoreMismatch)
if err == nil {
// Success
break
}
if retryableError(err) {
maxTries--
d.log("Retrying %d %s\n", maxTries, url)
time.Sleep(delay)
} else {
// Can't retry
d.log("Error (retrying): HTTP code %s while fetching %s\n", err, url)
break
}
}
return err
}
func (d *GrabDownloader) log(msg string, a ...interface{}) {
fmt.Printf(msg, a...)
if d.progress != nil {
d.progress.Printf(msg, a...)
}
}
func (d *GrabDownloader) maybeSetupChecksum(req *grab.Request, expected *utils.ChecksumInfo) error {
if expected == nil {
// Nothing to setup
return nil
}
if expected.MD5 != "" {
expectedHash, err := hex.DecodeString(expected.MD5)
if err != nil {
return err
}
req.SetChecksum(md5.New(), expectedHash, true)
} else if expected.SHA1 != "" {
expectedHash, err := hex.DecodeString(expected.SHA1)
if err != nil {
return err
}
req.SetChecksum(sha1.New(), expectedHash, true)
} else if expected.SHA256 != "" {
expectedHash, err := hex.DecodeString(expected.SHA256)
if err != nil {
return err
}
req.SetChecksum(sha256.New(), expectedHash, true)
} else if expected.SHA512 != "" {
expectedHash, err := hex.DecodeString(expected.SHA512)
if err != nil {
return err
}
req.SetChecksum(sha512.New(), expectedHash, true)
}
req.Size = expected.Size
return nil
}
func (d *GrabDownloader) download(_ context.Context, url string, destination string, expected *utils.ChecksumInfo, ignoreMismatch bool) error {
d.log("Downloading: %s\n", url)
req, err := grab.NewRequest(destination, url)
if err != nil {
d.log("Error creating new request: %v\n", err)
return errors.Wrap(err, url)
}
if d.downLimit > 0 {
req.RateLimiter = rate.NewLimiter(rate.Limit(d.downLimit), int(d.downLimit))
}
err = d.maybeSetupChecksum(req, expected)
if err != nil {
d.log("Error setting up checksum: %v\n", err)
return errors.Wrap(err, url)
}
resp := d.client.Do(req)
<-resp.Done
// download is complete
// Loop:
// for {
// select {
// case <-resp.Done:
// // download is complete
// break Loop
// }
// }
err = resp.Err()
if err != nil && err == grab.ErrBadChecksum && ignoreMismatch {
fmt.Printf("Ignoring checksum mismatch for %s\n", url)
return nil
}
return err
}
func (d *GrabDownloader) GetProgress() aptly.Progress {
return d.progress
}
func (d *GrabDownloader) GetLength(_ context.Context, url string) (int64, error) {
resp, err := http.Head(url)
if err != nil {
return -1, err
}
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return -1, &Error{Code: resp.StatusCode, URL: url}
}
if resp.ContentLength < 0 {
return -1, fmt.Errorf("could not determine length of %s", url)
}
return resp.ContentLength, nil
}
|
