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piece_downloader.go
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piece_downloader.go
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/*
* Copyright 2020 The Dragonfly Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//go:generate mockgen -destination piece_downloader_mock.go -source piece_downloader.go -package peer
package peer
import (
"context"
"crypto/tls"
"crypto/x509"
"fmt"
"io"
"net"
"net/http"
"net/url"
"time"
"go.opentelemetry.io/otel"
"go.opentelemetry.io/otel/propagation"
"google.golang.org/grpc/status"
commonv1 "d7y.io/api/v2/pkg/apis/common/v1"
"d7y.io/dragonfly/v2/client/daemon/storage"
logger "d7y.io/dragonfly/v2/internal/dflog"
"d7y.io/dragonfly/v2/pkg/digest"
"d7y.io/dragonfly/v2/pkg/source"
)
type DownloadPieceRequest struct {
piece *commonv1.PieceInfo
log *logger.SugaredLoggerOnWith
storage storage.TaskStorageDriver
TaskID string
PeerID string
DstPid string
DstAddr string
CalcDigest bool
}
type DownloadPieceResult struct {
// Size of piece
Size int64
// BeginTime nanosecond
BeginTime int64
// FinishTime nanosecond
FinishTime int64
DstPeerID string
Fail bool
pieceInfo *commonv1.PieceInfo
}
type PieceDownloader interface {
DownloadPiece(context.Context, *DownloadPieceRequest) (io.Reader, io.Closer, error)
}
type PieceDownloaderOption func(*pieceDownloader) error
type pieceDownloader struct {
scheme string
httpClient *http.Client
}
type pieceDownloadError struct {
connectionError bool
status string
statusCode int
target string
err error
}
type backSourceError struct {
err error
st *status.Status
}
func isConnectionError(err error) bool {
if e, ok := err.(*pieceDownloadError); ok {
return e.connectionError
}
return false
}
func isPieceNotFound(err error) bool {
if e, ok := err.(*pieceDownloadError); ok {
return e.statusCode == http.StatusNotFound
}
return false
}
func isBackSourceError(err error) bool {
if _, ok := err.(*backSourceError); ok {
return true
}
if _, ok := err.(*source.UnexpectedStatusCodeError); ok {
return true
}
return false
}
func (e *pieceDownloadError) Error() string {
if e.connectionError {
return fmt.Sprintf("connect with %s with error: %s", e.target, e.err)
}
return fmt.Sprintf("download %s with error status: %s", e.target, e.status)
}
func (e *backSourceError) Error() string {
if e.st != nil {
return e.st.Err().Error()
}
return e.err.Error()
}
var _ PieceDownloader = (*pieceDownloader)(nil)
var defaultTransport http.RoundTripper = &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 2 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
ResponseHeaderTimeout: 2 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 2 * time.Second,
}
func NewPieceDownloader(timeout time.Duration, caCertPool *x509.CertPool) PieceDownloader {
pd := &pieceDownloader{
scheme: "http",
httpClient: &http.Client{
Transport: defaultTransport,
Timeout: timeout,
},
}
if caCertPool != nil {
pd.scheme = "https"
defaultTransport.(*http.Transport).TLSClientConfig = &tls.Config{
ClientCAs: caCertPool,
RootCAs: caCertPool,
}
}
return pd
}
func (p *pieceDownloader) DownloadPiece(ctx context.Context, req *DownloadPieceRequest) (io.Reader, io.Closer, error) {
httpRequest, err := p.buildDownloadPieceHTTPRequest(ctx, req)
if err != nil {
return nil, nil, err
}
resp, err := p.httpClient.Do(httpRequest)
if err != nil {
logger.Errorf("task id: %s, piece num: %d, dst: %s, download piece failed: %s",
req.TaskID, req.piece.PieceNum, req.DstAddr, err)
return nil, nil, &pieceDownloadError{
target: httpRequest.URL.String(),
err: err,
connectionError: true,
}
}
if resp.StatusCode > 299 {
_, _ = io.Copy(io.Discard, resp.Body)
_ = resp.Body.Close()
return nil, nil, &pieceDownloadError{
target: httpRequest.URL.String(),
err: err,
connectionError: false,
status: resp.Status,
statusCode: resp.StatusCode,
}
}
reader, closer := resp.Body.(io.Reader), resp.Body.(io.Closer)
if req.CalcDigest {
req.log.Debugf("calculate digest for piece %d, digest: %s", req.piece.PieceNum, req.piece.PieceMd5)
reader, err = digest.NewReader(digest.AlgorithmMD5, io.LimitReader(resp.Body, int64(req.piece.RangeSize)), digest.WithEncoded(req.piece.PieceMd5), digest.WithLogger(req.log))
if err != nil {
_ = closer.Close()
req.log.Errorf("init digest reader error: %s", err.Error())
return nil, nil, err
}
}
return reader, closer, nil
}
func (p *pieceDownloader) buildDownloadPieceHTTPRequest(ctx context.Context, d *DownloadPieceRequest) (*http.Request, error) {
if len(d.TaskID) <= 3 {
return nil, fmt.Errorf("invalid task id")
}
// FIXME switch to https when tls enabled
targetURL := url.URL{
Scheme: p.scheme,
Host: d.DstAddr,
Path: fmt.Sprintf("download/%s/%s", d.TaskID[:3], d.TaskID),
RawQuery: fmt.Sprintf("peerId=%s", d.DstPid),
}
logger.Debugf("built request url: %s", targetURL.String())
req, _ := http.NewRequestWithContext(ctx, http.MethodGet, targetURL.String(), nil)
// TODO use string.Builder
req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d",
d.piece.RangeStart, d.piece.RangeStart+uint64(d.piece.RangeSize)-1))
// inject trace id into request header
otel.GetTextMapPropagator().Inject(ctx, propagation.HeaderCarrier(req.Header))
return req, nil
}