455 lines
13 KiB
Go
455 lines
13 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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"math"
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"net"
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"net/http"
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"time"
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"golang.org/x/time/rate"
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"d7y.io/dragonfly/v2/client/clientutil"
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"d7y.io/dragonfly/v2/client/config"
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"d7y.io/dragonfly/v2/client/daemon/storage"
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logger "d7y.io/dragonfly/v2/internal/dflog"
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"d7y.io/dragonfly/v2/internal/util"
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"d7y.io/dragonfly/v2/pkg/rpc/base"
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"d7y.io/dragonfly/v2/pkg/rpc/scheduler"
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"d7y.io/dragonfly/v2/pkg/source"
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"d7y.io/dragonfly/v2/pkg/util/digestutils"
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)
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type PieceManager interface {
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DownloadSource(ctx context.Context, pt Task, request *scheduler.PeerTaskRequest) error
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DownloadPiece(ctx context.Context, request *DownloadPieceRequest) (*DownloadPieceResult, error)
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}
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type pieceManager struct {
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*rate.Limiter
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pieceDownloader PieceDownloader
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computePieceSize func(contentLength int64) uint32
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calculateDigest bool
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}
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var _ PieceManager = (*pieceManager)(nil)
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func NewPieceManager(s storage.TaskStorageDriver, pieceDownloadTimeout time.Duration, opts ...func(*pieceManager)) (PieceManager, error) {
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pm := &pieceManager{
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computePieceSize: util.ComputePieceSize,
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calculateDigest: true,
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}
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for _, opt := range opts {
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opt(pm)
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}
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// set default value
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if pm.pieceDownloader == nil {
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pm.pieceDownloader, _ = NewPieceDownloader(pieceDownloadTimeout)
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}
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return pm, nil
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}
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func WithCalculateDigest(enable bool) func(*pieceManager) {
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return func(pm *pieceManager) {
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logger.Infof("set calculateDigest to %t for piece manager", enable)
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pm.calculateDigest = enable
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}
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}
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// WithLimiter sets upload rate limiter, the burst size must be bigger than piece size
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func WithLimiter(limiter *rate.Limiter) func(*pieceManager) {
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return func(manager *pieceManager) {
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manager.Limiter = limiter
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}
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}
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func WithTransportOption(opt *config.TransportOption) func(*pieceManager) {
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return func(manager *pieceManager) {
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if opt == nil {
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return
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}
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if opt.IdleConnTimeout > 0 {
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defaultTransport.(*http.Transport).IdleConnTimeout = opt.IdleConnTimeout
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}
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if opt.DialTimeout > 0 && opt.KeepAlive > 0 {
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defaultTransport.(*http.Transport).DialContext = (&net.Dialer{
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Timeout: opt.DialTimeout,
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KeepAlive: opt.KeepAlive,
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DualStack: true,
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}).DialContext
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}
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if opt.MaxIdleConns > 0 {
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defaultTransport.(*http.Transport).MaxIdleConns = opt.MaxIdleConns
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}
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if opt.ExpectContinueTimeout > 0 {
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defaultTransport.(*http.Transport).ExpectContinueTimeout = opt.ExpectContinueTimeout
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}
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if opt.ResponseHeaderTimeout > 0 {
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defaultTransport.(*http.Transport).ResponseHeaderTimeout = opt.ResponseHeaderTimeout
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}
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if opt.TLSHandshakeTimeout > 0 {
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defaultTransport.(*http.Transport).TLSHandshakeTimeout = opt.TLSHandshakeTimeout
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}
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logger.Infof("default transport: %#v", defaultTransport)
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}
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}
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func (pm *pieceManager) DownloadPiece(ctx context.Context, request *DownloadPieceRequest) (*DownloadPieceResult, error) {
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var result = &DownloadPieceResult{
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Size: -1,
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BeginTime: time.Now().UnixNano(),
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FinishTime: 0,
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}
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// prepare trace and limit
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ctx, span := tracer.Start(ctx, config.SpanWritePiece)
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defer span.End()
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if pm.Limiter != nil {
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if err := pm.Limiter.WaitN(ctx, int(request.piece.RangeSize)); err != nil {
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result.FinishTime = time.Now().UnixNano()
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request.log.Errorf("require rate limit access error: %s", err)
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return result, err
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}
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}
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request.CalcDigest = pm.calculateDigest && request.piece.PieceMd5 != ""
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span.SetAttributes(config.AttributeTargetPeerID.String(request.DstPid))
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span.SetAttributes(config.AttributeTargetPeerAddr.String(request.DstAddr))
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span.SetAttributes(config.AttributePiece.Int(int(request.piece.PieceNum)))
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// 1. download piece
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r, c, err := pm.pieceDownloader.DownloadPiece(ctx, request)
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if err != nil {
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result.FinishTime = time.Now().UnixNano()
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span.RecordError(err)
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request.log.Errorf("download piece failed, piece num: %d, error: %s, from peer: %s",
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request.piece.PieceNum, err, request.DstPid)
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return result, err
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}
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defer c.Close()
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// 2. save to storage
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writePieceRequest := &storage.WritePieceRequest{
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Reader: r,
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PeerTaskMetadata: storage.PeerTaskMetadata{
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PeerID: request.PeerID,
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TaskID: request.TaskID,
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},
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PieceMetadata: storage.PieceMetadata{
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Num: request.piece.PieceNum,
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Md5: request.piece.PieceMd5,
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Offset: request.piece.PieceOffset,
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Range: clientutil.Range{
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Start: int64(request.piece.RangeStart),
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Length: int64(request.piece.RangeSize),
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},
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},
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}
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result.Size, err = request.storage.WritePiece(ctx, writePieceRequest)
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result.FinishTime = time.Now().UnixNano()
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span.RecordError(err)
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if err != nil {
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request.log.Errorf("put piece to storage failed, piece num: %d, wrote: %d, error: %s",
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request.piece.PieceNum, result.Size, err)
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return result, err
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}
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return result, nil
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}
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func (pm *pieceManager) processPieceFromSource(pt Task,
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reader io.Reader, contentLength int64, pieceNum int32, pieceOffset uint64, pieceSize uint32, isLastPiece func(n int64) (int32, bool)) (
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result *DownloadPieceResult, md5 string, err error) {
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result = &DownloadPieceResult{
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Size: -1,
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BeginTime: time.Now().UnixNano(),
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FinishTime: 0,
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}
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var (
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unknownLength = contentLength == -1
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)
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if pm.Limiter != nil {
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if err = pm.Limiter.WaitN(pt.Context(), int(pieceSize)); err != nil {
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result.FinishTime = time.Now().UnixNano()
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pt.Log().Errorf("require rate limit access error: %s", err)
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return
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}
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}
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if pm.calculateDigest {
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pt.Log().Debugf("calculate digest")
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reader = digestutils.NewDigestReader(pt.Log(), reader)
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}
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var n int64
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result.Size, err = pt.GetStorage().WritePiece(
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pt.Context(),
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&storage.WritePieceRequest{
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UnknownLength: unknownLength,
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PeerTaskMetadata: storage.PeerTaskMetadata{
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PeerID: pt.GetPeerID(),
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TaskID: pt.GetTaskID(),
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},
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PieceMetadata: storage.PieceMetadata{
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Num: pieceNum,
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// storage manager will get digest from DigestReader, keep empty here is ok
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Md5: "",
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Offset: pieceOffset,
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Range: clientutil.Range{
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Start: int64(pieceOffset),
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Length: int64(pieceSize),
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},
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},
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Reader: reader,
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GenPieceDigest: isLastPiece,
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})
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result.FinishTime = time.Now().UnixNano()
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if n > 0 {
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pt.AddTraffic(uint64(n))
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}
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if err != nil {
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pt.Log().Errorf("put piece to storage failed, piece num: %d, wrote: %d, error: %s", pieceNum, n, err)
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return
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}
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if pm.calculateDigest {
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md5 = reader.(digestutils.DigestReader).Digest()
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}
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return
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}
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func (pm *pieceManager) DownloadSource(ctx context.Context, pt Task, request *scheduler.PeerTaskRequest) error {
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if request.UrlMeta == nil {
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request.UrlMeta = &base.UrlMeta{
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Header: map[string]string{},
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}
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} else if request.UrlMeta.Header == nil {
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request.UrlMeta.Header = map[string]string{}
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}
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if request.UrlMeta.Range != "" {
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// in http source package, adapter will update the real range, we inject "X-Dragonfly-Range" here
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request.UrlMeta.Header[source.Range] = request.UrlMeta.Range
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}
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log := pt.Log()
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log.Infof("start to download from source")
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contentLengthRequest, err := source.NewRequestWithContext(ctx, request.Url, request.UrlMeta.Header)
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if err != nil {
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return err
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}
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contentLength, err := source.GetContentLength(contentLengthRequest)
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if err != nil {
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log.Warnf("get content length error: %s for %s", err, request.Url)
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}
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if contentLength < 0 {
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log.Warnf("can not get content length for %s", request.Url)
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} else {
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err = pt.GetStorage().UpdateTask(ctx,
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&storage.UpdateTaskRequest{
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PeerTaskMetadata: storage.PeerTaskMetadata{
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PeerID: pt.GetPeerID(),
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TaskID: pt.GetTaskID(),
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},
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ContentLength: contentLength,
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})
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if err != nil {
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return err
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}
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}
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log.Debugf("get content length: %d", contentLength)
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// 1. download piece from source
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downloadRequest, err := source.NewRequestWithContext(ctx, request.Url, request.UrlMeta.Header)
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if err != nil {
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return err
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}
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response, err := source.Download(downloadRequest)
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// TODO update expire info
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if err != nil {
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return err
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}
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defer response.Body.Close()
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reader := response.Body.(io.Reader)
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// calc total
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if pm.calculateDigest {
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reader = digestutils.NewDigestReader(pt.Log(), response.Body, request.UrlMeta.Digest)
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}
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// we must calculate piece size
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pieceSize := pm.computePieceSize(contentLength)
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// 2. save to storage
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// handle resource which content length is unknown
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if contentLength < 0 {
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return pm.downloadUnknownLengthSource(ctx, pt, pieceSize, reader)
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}
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return pm.downloadKnownLengthSource(ctx, pt, contentLength, pieceSize, reader)
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}
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func (pm *pieceManager) downloadKnownLengthSource(ctx context.Context, pt Task, contentLength int64, pieceSize uint32, reader io.Reader) error {
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log := pt.Log()
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pt.SetContentLength(contentLength)
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maxPieceNum := int32(math.Ceil(float64(contentLength) / float64(pieceSize)))
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for pieceNum := int32(0); pieceNum < maxPieceNum; pieceNum++ {
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size := pieceSize
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offset := uint64(pieceNum) * uint64(pieceSize)
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// calculate piece size for last piece
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if contentLength > 0 && int64(offset)+int64(size) > contentLength {
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size = uint32(contentLength - int64(offset))
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}
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log.Debugf("download piece %d", pieceNum)
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result, md5, err := pm.processPieceFromSource(
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pt, reader, contentLength, pieceNum, offset, size,
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func(int64) (int32, bool) {
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return maxPieceNum, pieceNum == maxPieceNum-1
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})
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request := &DownloadPieceRequest{
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TaskID: pt.GetTaskID(),
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PeerID: pt.GetPeerID(),
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piece: &base.PieceInfo{
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PieceNum: pieceNum,
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RangeStart: offset,
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RangeSize: uint32(result.Size),
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PieceMd5: md5,
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PieceOffset: offset,
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PieceStyle: 0,
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},
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}
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if err != nil {
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log.Errorf("download piece %d error: %s", pieceNum, err)
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pt.ReportPieceResult(request, result, err)
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return err
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}
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if result.Size != int64(size) {
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log.Errorf("download piece %d size not match, desired: %d, actual: %d", pieceNum, size, result.Size)
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pt.ReportPieceResult(request, result, err)
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return storage.ErrShortRead
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}
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if pieceNum == maxPieceNum-1 {
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// last piece
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err = pt.GetStorage().UpdateTask(ctx,
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&storage.UpdateTaskRequest{
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PeerTaskMetadata: storage.PeerTaskMetadata{
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PeerID: pt.GetPeerID(),
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TaskID: pt.GetTaskID(),
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},
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ContentLength: contentLength,
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TotalPieces: maxPieceNum,
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})
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if err != nil {
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log.Errorf("update task failed %s", err)
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pt.ReportPieceResult(request, result, err)
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return err
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}
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}
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pt.ReportPieceResult(request, result, nil)
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pt.PublishPieceInfo(pieceNum, uint32(result.Size))
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}
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log.Infof("download from source ok")
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return nil
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}
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func (pm *pieceManager) downloadUnknownLengthSource(ctx context.Context, pt Task, pieceSize uint32, reader io.Reader) error {
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var contentLength int64 = -1
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log := pt.Log()
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for pieceNum := int32(0); ; pieceNum++ {
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size := pieceSize
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offset := uint64(pieceNum) * uint64(pieceSize)
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log.Debugf("download piece %d", pieceNum)
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result, md5, err := pm.processPieceFromSource(
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pt, reader, contentLength, pieceNum, offset, size,
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func(n int64) (int32, bool) {
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if n >= int64(pieceSize) {
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return -1, false
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}
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// content length is aligned at pieceSize
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// when n == 0, need ignore current piece
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if n == 0 {
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return pieceNum, true
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}
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return pieceNum + 1, true
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})
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request := &DownloadPieceRequest{
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TaskID: pt.GetTaskID(),
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PeerID: pt.GetPeerID(),
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piece: &base.PieceInfo{
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PieceNum: pieceNum,
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RangeStart: offset,
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RangeSize: uint32(result.Size),
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PieceMd5: md5,
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PieceOffset: offset,
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PieceStyle: 0,
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},
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}
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if err != nil {
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pt.ReportPieceResult(request, result, err)
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log.Errorf("download piece %d error: %s", pieceNum, err)
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return err
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}
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if result.Size == int64(size) {
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pt.ReportPieceResult(request, result, nil)
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pt.PublishPieceInfo(pieceNum, uint32(result.Size))
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continue
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} else if result.Size > int64(size) {
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err = fmt.Errorf("piece %d size %d should not great than %d", pieceNum, result.Size, size)
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log.Errorf(err.Error())
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pt.ReportPieceResult(request, result, err)
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return err
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}
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// last piece, piece size maybe 0
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contentLength = int64(pieceSize)*int64(pieceNum) + result.Size
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pt.SetTotalPieces(int32(math.Ceil(float64(contentLength) / float64(pieceSize))))
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err = pt.GetStorage().UpdateTask(ctx,
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&storage.UpdateTaskRequest{
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PeerTaskMetadata: storage.PeerTaskMetadata{
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PeerID: pt.GetPeerID(),
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TaskID: pt.GetTaskID(),
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},
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ContentLength: contentLength,
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TotalPieces: pt.GetTotalPieces(),
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})
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if err != nil {
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log.Errorf("update task failed %s", err)
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pt.ReportPieceResult(request, result, err)
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return err
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}
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// content length is aligning at piece size
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if result.Size == 0 {
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break
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}
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pt.ReportPieceResult(request, result, nil)
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pt.PublishPieceInfo(pieceNum, uint32(result.Size))
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break
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}
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pt.SetContentLength(contentLength)
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log.Infof("download from source ok")
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return nil
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}
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