lotus/storage/paths/fetch.go

106 lines
2.8 KiB
Go
Raw Normal View History

2022-08-31 17:34:08 +00:00
package paths
import (
"context"
"io"
"mime"
"net/http"
"os"
"time"
"github.com/hashicorp/go-multierror"
"golang.org/x/xerrors"
"github.com/filecoin-project/lotus/storage/sealer/tarutil"
)
func fetch(ctx context.Context, url, outname string, header http.Header) (rerr error) {
log.Infof("Fetch %s -> %s", url, outname)
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return xerrors.Errorf("request: %w", err)
}
req.Header = header
req = req.WithContext(ctx)
resp, err := http.DefaultClient.Do(req)
if err != nil {
return xerrors.Errorf("do request: %w", err)
}
defer resp.Body.Close() // nolint
if resp.StatusCode != 200 {
return xerrors.Errorf("non-200 code: %d", resp.StatusCode)
}
start := time.Now()
var bytes int64
defer func() {
took := time.Now().Sub(start)
mibps := float64(bytes) / 1024 / 1024 * float64(time.Second) / float64(took)
log.Infow("Fetch done", "url", url, "out", outname, "took", took.Round(time.Millisecond), "bytes", bytes, "MiB/s", mibps, "err", rerr)
}()
mediatype, _, err := mime.ParseMediaType(resp.Header.Get("Content-Type"))
if err != nil {
return xerrors.Errorf("parse media type: %w", err)
}
if err := os.RemoveAll(outname); err != nil {
return xerrors.Errorf("removing dest: %w", err)
}
switch mediatype {
case "application/x-tar":
bytes, err = tarutil.ExtractTar(resp.Body, outname, make([]byte, CopyBuf))
return err
case "application/octet-stream":
f, err := os.Create(outname)
if err != nil {
return err
}
bytes, err = io.CopyBuffer(f, resp.Body, make([]byte, CopyBuf))
if err != nil {
f.Close() // nolint
return err
}
return f.Close()
default:
return xerrors.Errorf("unknown content type: '%s'", mediatype)
}
}
// FetchWithTemp fetches data into a temp 'fetching' directory, then moves the file to destination
2022-09-16 21:45:23 +00:00
// The set of URLs must refer to the same object, if one fails, another one will be tried.
2022-08-31 17:34:08 +00:00
func FetchWithTemp(ctx context.Context, urls []string, dest string, header http.Header) (string, error) {
var merr error
for _, url := range urls {
tempDest, err := tempFetchDest(dest, true)
if err != nil {
return "", err
}
if err := os.RemoveAll(dest); err != nil {
return "", xerrors.Errorf("removing dest: %w", err)
}
err = fetch(ctx, url, tempDest, header)
if err != nil {
merr = multierror.Append(merr, xerrors.Errorf("fetch error %s -> %s: %w", url, tempDest, err))
continue
}
if err := move(tempDest, dest); err != nil {
return "", xerrors.Errorf("fetch move error %s -> %s: %w", tempDest, dest, err)
}
if merr != nil {
log.Warnw("acquireFromRemote encountered errors when fetching sector from remote", "errors", merr)
}
return url, nil
}
return "", xerrors.Errorf("failed to fetch sector file (tried %v): %w", urls, merr)
}