136 lines
3.7 KiB
Go
136 lines
3.7 KiB
Go
/*
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* Copyright 2020 The Dragonfly Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package peer
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import (
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"context"
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"fmt"
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"io"
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"net"
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"net/http"
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"strings"
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"time"
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"d7y.io/dragonfly/v2/client/daemon/upload"
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logger "d7y.io/dragonfly/v2/internal/dflog"
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"d7y.io/dragonfly/v2/pkg/rpc/base"
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"d7y.io/dragonfly/v2/pkg/util/digestutils"
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)
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type DownloadPieceRequest struct {
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TaskID string
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DstPid string
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DstAddr string
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CalcDigest bool
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piece *base.PieceInfo
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log *logger.SugaredLoggerOnWith
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}
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type PieceDownloader interface {
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DownloadPiece(context.Context, *DownloadPieceRequest) (io.Reader, io.Closer, error)
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}
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type pieceDownloader struct {
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transport http.RoundTripper
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httpClient *http.Client
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}
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var _ PieceDownloader = (*pieceDownloader)(nil)
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var defaultTransport http.RoundTripper = &http.Transport{
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Proxy: http.ProxyFromEnvironment,
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DialContext: (&net.Dialer{
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Timeout: 2 * time.Second,
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KeepAlive: 30 * time.Second,
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DualStack: true,
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}).DialContext,
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MaxIdleConns: 100,
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IdleConnTimeout: 90 * time.Second,
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ResponseHeaderTimeout: 2 * time.Second,
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TLSHandshakeTimeout: 10 * time.Second,
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ExpectContinueTimeout: 2 * time.Second,
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}
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func NewPieceDownloader(timeout time.Duration, opts ...func(*pieceDownloader) error) (PieceDownloader, error) {
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pd := &pieceDownloader{}
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for _, opt := range opts {
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if err := opt(pd); err != nil {
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return nil, err
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}
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}
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if pd.transport == nil {
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pd.transport = defaultTransport
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}
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pd.httpClient = &http.Client{
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Transport: pd.transport,
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Timeout: timeout,
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}
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return pd, nil
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}
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func WithTransport(rt http.RoundTripper) func(*pieceDownloader) error {
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return func(d *pieceDownloader) error {
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d.transport = rt
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return nil
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}
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}
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func (p *pieceDownloader) DownloadPiece(ctx context.Context, d *DownloadPieceRequest) (io.Reader, io.Closer, error) {
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resp, err := p.httpClient.Do(buildDownloadPieceHTTPRequest(ctx, d))
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if err != nil {
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logger.Errorf("task id: %s, piece num: %d, dst: %s, download piece failed: %s",
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d.TaskID, d.piece.PieceNum, d.DstAddr, err)
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return nil, nil, err
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}
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if resp.StatusCode > 299 {
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_, _ = io.Copy(io.Discard, resp.Body)
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_ = resp.Body.Close()
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return nil, nil, fmt.Errorf("download piece failed with http code: %s", resp.Status)
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}
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r := resp.Body.(io.Reader)
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c := resp.Body.(io.Closer)
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if d.CalcDigest {
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d.log.Debugf("calculate digest for piece %d, md5: %s", d.piece.PieceNum, d.piece.PieceMd5)
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r = digestutils.NewDigestReader(d.log, io.LimitReader(resp.Body, int64(d.piece.RangeSize)), d.piece.PieceMd5)
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}
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return r, c, nil
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}
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func buildDownloadPieceHTTPRequest(ctx context.Context, d *DownloadPieceRequest) *http.Request {
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b := strings.Builder{}
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b.WriteString("http://")
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b.WriteString(d.DstAddr)
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b.WriteString(upload.PeerDownloadHTTPPathPrefix)
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b.Write([]byte(d.TaskID)[:3])
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b.Write([]byte("/"))
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b.WriteString(d.TaskID)
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b.Write([]byte("?peerId="))
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b.WriteString(d.DstPid)
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u := b.String()
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logger.Debugf("built request url: %s", u)
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req, _ := http.NewRequestWithContext(ctx, http.MethodGet, u, nil)
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// TODO use string.Builder
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req.Header.Add("Range", fmt.Sprintf("bytes=%d-%d",
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d.piece.RangeStart, d.piece.RangeStart+uint64(d.piece.RangeSize)-1))
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return req
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}
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