feat: integration torrent (#30)

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '^1.15.2'
+          go-version: '^1.18'
       - uses: actions/checkout@v2
       - name: Build Cli
         run: |

.github/workflows/test.yml

@@ -21,7 +21,7 @@ jobs:
 #    steps:
 #      - uses: actions/setup-go@v2
 #        with:
-#          go-version: '^1.15.2'
+#          go-version: '^1.18'
 #      - uses: actions/checkout@v2
 #      - name: Lint Go Code
 #        run: |
@@ -34,7 +34,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '^1.15.2'
+          go-version: '^1.18'
       - uses: actions/checkout@v2
       - name: Run Unit tests.
         run: go test ./... -v -covermode=count -coverprofile=coverage.txt
@@ -50,7 +50,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v2
         with:
-          go-version: '^1.15.2'
+          go-version: '^1.18'
       - uses: actions/checkout@v2
       - name: Build
         run: go build -ldflags="-s -w" -o gopeed cmd/gopeed/*

.gitignore

@@ -13,4 +13,6 @@
 
 debug
 
-.idea/
+.idea/
+
+bin/

README.md

@@ -29,13 +29,13 @@ go install github.com/monkeyWie/gopeed-core
 ## TODO
 
 - [x] HTTP 下载实现
-- [ ] BitTorrent 下载实现
+- [x] BitTorrent 下载实现
   - [x] .torrent 文件解析
   - [x] tracker 协议实现
   - [x] peer wire protocol 协议实现
-  - [ ] DHT 协议实现
-  - [ ] 磁力链接支持
-  - [ ] uTP 协议实现
+  - [x] DHT 协议实现
+  - [x] 磁力链接支持
+  - [x] uTP 协议实现
 - [x] 下载接口抽象(不关心具体协议)
 - [ ] 支持自定义配置
 - [ ] 限速功能实现

cmd/gopeed/flags.go

@@ -20,7 +20,7 @@ func parse() *args {
 	}
 	var args args
 	args.connections = flag.Int("C", 16, "Concurrent connections.")
-	args.dir = flag.String("D", dir, "Save directory.")
+	args.dir = flag.String("D", dir, "Store directory.")
 	flag.Parse()
 	t := flag.Args()
 	if len(t) > 0 {

cmd/gopeed/gopeed.go

@@ -5,7 +5,7 @@ import (
 	"github.com/monkeyWie/gopeed-core/pkg/base"
 	"github.com/monkeyWie/gopeed-core/pkg/download"
 	"github.com/monkeyWie/gopeed-core/pkg/util"
-	"path/filepath"
+	"strings"
 	"sync"
 )
 
@@ -31,9 +31,9 @@ func main() {
 				printProgress(event.Task, title)
 				fmt.Println()
 				if event.Err != nil {
-					gPrint("reason: " + event.Err.Error())
+					fmt.Printf("reason: %s", event.Err.Error())
 				} else {
-					gPrint("saving file " + filepath.Join(*args.dir, event.Task.Res.Files[0].Name))
+					fmt.Printf("saving path: %s", *args.dir)
 				}
 				wg.Done()
 			}
@@ -49,18 +49,32 @@ func main() {
 	wg.Wait()
 }
 
-func printProgress(task *download.TaskInfo, title string) {
-	rate := float64(task.Progress.Downloaded) / float64(task.Res.TotalSize)
+var (
+	lastLineLen = 0
+	sb          = new(strings.Builder)
+)
+
+func printProgress(task *download.Task, title string) {
+	rate := float64(task.Progress.Downloaded) / float64(task.Res.Length)
 	completeWidth := int(progressWidth * rate)
 	speed := util.ByteFmt(task.Progress.Speed)
-	totalSize := util.ByteFmt(task.Res.TotalSize)
-	fmt.Printf("\r%s [", title)
+	totalSize := util.ByteFmt(task.Res.Length)
+	sb.WriteString(fmt.Sprintf("\r%s [", title))
 	for i := 0; i < progressWidth; i++ {
 		if i < completeWidth {
-			fmt.Print("■")
+			sb.WriteString("■")
 		} else {
-			fmt.Print("□")
+			sb.WriteString("□")
 		}
 	}
-	fmt.Printf("] %.1f%%    %s/s    %s", rate*100, speed, totalSize)
+	sb.WriteString(fmt.Sprintf("] %.1f%%    %s/s    %s", rate*100, speed, totalSize))
+	if lastLineLen != 0 {
+		paddingLen := lastLineLen - sb.Len()
+		if paddingLen > 0 {
+			sb.WriteString(strings.Repeat(" ", paddingLen))
+		}
+	}
+	lastLineLen = sb.Len()
+	fmt.Print(sb.String())
+	sb.Reset()
 }

go.mod

@@ -1,9 +1,69 @@
 module github.com/monkeyWie/gopeed-core
 
-go 1.15
+go 1.18
 
 require (
-	github.com/google/uuid v1.1.1
-	golang.org/x/net v0.0.0-20200707034311-ab3426394381
+	github.com/anacrolix/torrent v1.46.0
+	github.com/google/uuid v1.3.0
+	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
 )
+
+require (
+	crawshaw.io/sqlite v0.3.3-0.20210127221821-98b1f83c5508 // indirect
+	github.com/RoaringBitmap/roaring v1.0.1-0.20220510143707-3f418c4f42a4 // indirect
+	github.com/ajwerner/btree v0.0.0-20211221152037-f427b3e689c0 // indirect
+	github.com/anacrolix/chansync v0.3.0 // indirect
+	github.com/anacrolix/dht/v2 v2.16.2-0.20220311024416-dd658f18fd51 // indirect
+	github.com/anacrolix/envpprof v1.2.1 // indirect
+	github.com/anacrolix/generics v0.0.0-20220618083756-f99e35403a60 // indirect
+	github.com/anacrolix/go-libutp v1.2.0 // indirect
+	github.com/anacrolix/log v0.13.1 // indirect
+	github.com/anacrolix/missinggo v1.3.0 // indirect
+	github.com/anacrolix/missinggo/perf v1.0.0 // indirect
+	github.com/anacrolix/missinggo/v2 v2.7.0 // indirect
+	github.com/anacrolix/mmsg v1.0.0 // indirect
+	github.com/anacrolix/multiless v0.2.1-0.20211218050420-533661eef5dc // indirect
+	github.com/anacrolix/stm v0.3.0 // indirect
+	github.com/anacrolix/sync v0.4.0 // indirect
+	github.com/anacrolix/upnp v0.1.3-0.20220123035249-922794e51c96 // indirect
+	github.com/anacrolix/utp v0.1.0 // indirect
+	github.com/bahlo/generic-list-go v0.2.0 // indirect
+	github.com/benbjohnson/immutable v0.3.0 // indirect
+	github.com/bits-and-blooms/bitset v1.2.0 // indirect
+	github.com/bradfitz/iter v0.0.0-20191230175014-e8f45d346db8 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/dustin/go-humanize v1.0.0 // indirect
+	github.com/edsrzf/mmap-go v1.1.0 // indirect
+	github.com/google/btree v1.0.1 // indirect
+	github.com/gorilla/websocket v1.4.2 // indirect
+	github.com/huandu/xstrings v1.3.2 // indirect
+	github.com/lispad/go-generics-tools v1.0.0 // indirect
+	github.com/mschoch/smat v0.2.0 // indirect
+	github.com/pion/datachannel v1.5.2 // indirect
+	github.com/pion/dtls/v2 v2.1.2 // indirect
+	github.com/pion/ice/v2 v2.1.20 // indirect
+	github.com/pion/interceptor v0.1.7 // indirect
+	github.com/pion/logging v0.2.2 // indirect
+	github.com/pion/mdns v0.0.5 // indirect
+	github.com/pion/randutil v0.1.0 // indirect
+	github.com/pion/rtcp v1.2.9 // indirect
+	github.com/pion/rtp v1.7.4 // indirect
+	github.com/pion/sctp v1.8.2 // indirect
+	github.com/pion/sdp/v3 v3.0.4 // indirect
+	github.com/pion/srtp/v2 v2.0.5 // indirect
+	github.com/pion/stun v0.3.5 // indirect
+	github.com/pion/transport v0.13.0 // indirect
+	github.com/pion/turn/v2 v2.0.6 // indirect
+	github.com/pion/udp v0.1.1 // indirect
+	github.com/pion/webrtc/v3 v3.1.24-0.20220208053747-94262c1b2b38 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/rs/dnscache v0.0.0-20210201191234-295bba877686 // indirect
+	github.com/tidwall/btree v1.3.1 // indirect
+	go.etcd.io/bbolt v1.3.6 // indirect
+	golang.org/x/crypto v0.0.0-20220131195533-30dcbda58838 // indirect
+	golang.org/x/exp v0.0.0-20220428152302-39d4317da171 // indirect
+	golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e // indirect
+	golang.org/x/time v0.0.0-20210723032227-1f47c861a9ac // indirect
+	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
+)

go.sum

@@ -1,15 +1,441 @@
-github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
-github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+crawshaw.io/iox v0.0.0-20181124134642-c51c3df30797 h1:yDf7ARQc637HoxDho7xjqdvO5ZA2Yb+xzv/fOnnvZzw=
+crawshaw.io/iox v0.0.0-20181124134642-c51c3df30797/go.mod h1:sXBiorCo8c46JlQV3oXPKINnZ8mcqnye1EkVkqsectk=
+crawshaw.io/sqlite v0.3.2/go.mod h1:igAO5JulrQ1DbdZdtVq48mnZUBAPOeFzer7VhDWNtW4=
+crawshaw.io/sqlite v0.3.3-0.20210127221821-98b1f83c5508 h1:fILCBBFnjnrQ0whVJlGhfv1E/QiaFDNtGFBObEVRnYg=
+crawshaw.io/sqlite v0.3.3-0.20210127221821-98b1f83c5508/go.mod h1:igAO5JulrQ1DbdZdtVq48mnZUBAPOeFzer7VhDWNtW4=
+filippo.io/edwards25519 v1.0.0-rc.1 h1:m0VOOB23frXZvAOK44usCgLWvtsxIoMCTBGJZlpmGfU=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/RoaringBitmap/roaring v0.4.7/go.mod h1:8khRDP4HmeXns4xIj9oGrKSz7XTQiJx2zgh7AcNke4w=
+github.com/RoaringBitmap/roaring v0.4.17/go.mod h1:D3qVegWTmfCaX4Bl5CrBE9hfrSrrXIr8KVNvRsDi1NI=
+github.com/RoaringBitmap/roaring v0.4.23/go.mod h1:D0gp8kJQgE1A4LQ5wFLggQEyvDi06Mq5mKs52e1TwOo=
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+github.com/RoaringBitmap/roaring v1.0.1-0.20220510143707-3f418c4f42a4/go.mod h1:icnadbWcNyfEHlYdr+tDlOTih1Bf/h+rzPpv4sbomAA=
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+github.com/ajwerner/btree v0.0.0-20211221152037-f427b3e689c0/go.mod h1:q37NoqncT41qKc048STsifIt69LfUJ8SrWWcz/yam5k=
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internal/fetcher/fetcher.go

@@ -7,7 +7,7 @@ import (
 
 // 对应协议的下载支持
 type Fetcher interface {
-	Setup(ctl controller.Controller)
+	Setup(ctl controller.Controller) error
 	// 解析请求
 	Resolve(req *base.Request) (res *base.Resource, err error)
 	// 创建任务
@@ -22,14 +22,27 @@ type Fetcher interface {
 	Wait() (err error)
 }
 
+type FetcherBuilder interface {
+	Schemes() []string
+	Build() Fetcher
+}
+
+type FetcherSaver interface {
+	// Store 存储任务
+	Store(fetcher Fetcher) interface{}
+	// Resume 恢复任务
+	Resume(res *base.Resource, opts *base.Options, data interface{}) Fetcher
+}
+
 type DefaultFetcher struct {
 	Ctl    controller.Controller
 	DoneCh chan error
 }
 
-func (f *DefaultFetcher) Setup(ctl controller.Controller) {
+func (f *DefaultFetcher) Setup(ctl controller.Controller) (err error) {
 	f.Ctl = ctl
 	f.DoneCh = make(chan error, 1)
+	return
 }
 
 func (f *DefaultFetcher) Wait() (err error) {

internal/protocol/bt/fetcher.go

@@ -0,0 +1,115 @@
+package bt
+
+import (
+	"github.com/anacrolix/torrent"
+	"github.com/monkeyWie/gopeed-core/internal/controller"
+	"github.com/monkeyWie/gopeed-core/internal/fetcher"
+	"github.com/monkeyWie/gopeed-core/pkg/base"
+	"github.com/monkeyWie/gopeed-core/pkg/util"
+	"path/filepath"
+	"sync"
+)
+
+var client *torrent.Client
+
+type Fetcher struct {
+	Ctl controller.Controller
+
+	torrent *torrent.Torrent
+	opts    *base.Options
+}
+
+func (f *Fetcher) Setup(ctl controller.Controller) (err error) {
+	f.Ctl = ctl
+	var once sync.Once
+	once.Do(func() {
+		client, err = torrent.NewClient(nil)
+	})
+	return
+}
+
+func (f *Fetcher) Wait() (err error) {
+	client.WaitAll()
+	return nil
+}
+
+func (f *Fetcher) Resolve(req *base.Request) (res *base.Resource, err error) {
+	schema := util.ParseSchema(req.URL)
+	if schema == "MAGNET" {
+		f.torrent, err = client.AddMagnet(req.URL)
+	} else {
+		f.torrent, err = client.AddTorrentFromFile(req.URL)
+	}
+	if err != nil {
+		return
+	}
+	<-f.torrent.GotInfo()
+	res = &base.Resource{
+		Req:    req,
+		Length: f.torrent.Length(),
+		Range:  true,
+		Files:  make([]*base.FileInfo, len(f.torrent.Files())),
+	}
+	for i, file := range f.torrent.Files() {
+		res.Files[i] = &base.FileInfo{
+			Name: filepath.Base(file.DisplayPath()),
+			Path: filepath.Dir(file.Path()),
+			Size: file.Length(),
+		}
+	}
+	return
+}
+
+func (f *Fetcher) Create(res *base.Resource, opts *base.Options) (err error) {
+	f.opts = opts
+	if len(f.opts.SelectFiles) == 0 {
+		f.opts.SelectFiles = make([]int, len(res.Files))
+		for i := range f.opts.SelectFiles {
+			f.opts.SelectFiles[i] = i
+		}
+	}
+	return nil
+}
+
+func (f *Fetcher) Start() (err error) {
+	if len(f.opts.SelectFiles) == 0 {
+		f.torrent.DownloadAll()
+	} else {
+		for _, index := range f.opts.SelectFiles {
+			f.torrent.Files()[index].Download()
+		}
+	}
+	return
+}
+
+func (f *Fetcher) Pause() (err error) {
+	f.torrent.DisallowDataDownload()
+	return
+}
+
+func (f *Fetcher) Continue() (err error) {
+	f.torrent.AllowDataDownload()
+	return
+}
+
+func (f *Fetcher) Progress() fetcher.Progress {
+	p := make(fetcher.Progress, len(f.opts.SelectFiles))
+	for i := range p {
+		file := f.torrent.Files()[i]
+		p[i] = file.BytesCompleted()
+	}
+	return p
+}
+
+type FetcherBuilder struct {
+}
+
+var schemes = []string{"FILE", "MAGNET"}
+
+func (fb *FetcherBuilder) Schemes() []string {
+	return schemes
+}
+
+func (fb *FetcherBuilder) Build() fetcher.Fetcher {
+	return &Fetcher{}
+}

internal/protocol/bt/fetcher_test.go

@@ -0,0 +1,56 @@
+package bt
+
+import (
+	"fmt"
+	"github.com/monkeyWie/gopeed-core/internal/controller"
+	"github.com/monkeyWie/gopeed-core/internal/fetcher"
+	"github.com/monkeyWie/gopeed-core/pkg/base"
+	"testing"
+)
+
+func TestFetcher_Resolve_Magnet(t *testing.T) {
+	fetcher := buildFetcher()
+	res, err := fetcher.Resolve(&base.Request{
+		URL: "magnet:?xt=urn:btih:A213E40628B27B58E70F0DADAC5350CA05403AC4&dn=Microsoft%20Office%20PRO%20Plus%202021%20Retail%20Version%202108%20Build%2014326.2&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A6969%2Fannounce&tr=udp%3A%2F%2F9.rarbg.to%3A2710%2Fannounce&tr=udp%3A%2F%2F9.rarbg.me%3A2780%2Fannounce&tr=udp%3A%2F%2F9.rarbg.to%3A2730%2Fannounce&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337&tr=http%3A%2F%2Fp4p.arenabg.com%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Ftracker.tiny-vps.com%3A6969%2Fannounce&tr=udp%3A%2F%2Fopen.stealth.si%3A80%2Fannounce",
+	})
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(res)
+}
+
+func TestFetcher_Resolve_Torrent(t *testing.T) {
+	fetcher := buildFetcher()
+	res, err := fetcher.Resolve(&base.Request{
+		URL: "d:/test/test.torrent",
+	})
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println(res)
+}
+
+func TestFetcher_Create(t *testing.T) {
+	fetcher := buildFetcher()
+	res, err := fetcher.Resolve(&base.Request{
+		URL: "magnet:?xt=urn:btih:A213E40628B27B58E70F0DADAC5350CA05403AC4&dn=Microsoft%20Office%20PRO%20Plus%202021%20Retail%20Version%202108%20Build%2014326.2&tr=udp%3A%2F%2Ftracker.coppersurfer.tk%3A6969%2Fannounce&tr=udp%3A%2F%2Ftracker.openbittorrent.com%3A6969%2Fannounce&tr=udp%3A%2F%2F9.rarbg.to%3A2710%2Fannounce&tr=udp%3A%2F%2F9.rarbg.me%3A2780%2Fannounce&tr=udp%3A%2F%2F9.rarbg.to%3A2730%2Fannounce&tr=udp%3A%2F%2Ftracker.opentrackr.org%3A1337&tr=http%3A%2F%2Fp4p.arenabg.com%3A1337%2Fannounce&tr=udp%3A%2F%2Ftracker.torrent.eu.org%3A451%2Fannounce&tr=udp%3A%2F%2Ftracker.tiny-vps.com%3A6969%2Fannounce&tr=udp%3A%2F%2Fopen.stealth.si%3A80%2Fannounce",
+	})
+	if err != nil {
+		panic(err)
+	}
+	if err := fetcher.Create(res, &base.Options{}); err != nil {
+		panic(err)
+	}
+	if err := fetcher.Start(); err != nil {
+		panic(err)
+	}
+	if err := fetcher.Wait(); err != nil {
+		panic(err)
+	}
+}
+
+func buildFetcher() fetcher.Fetcher {
+	fetcher := new(FetcherBuilder).Build()
+	fetcher.Setup(controller.NewController())
+	return fetcher
+}

internal/protocol/http/fetcher.go

@@ -39,29 +39,14 @@ type Fetcher struct {
 	res     *base.Resource
 	opts    *base.Options
 	status  base.Status
-	clients []*http.Response
 	chunks  []*Chunk
+	clients []*http.Response
 
 	ctx     context.Context
 	cancel  context.CancelFunc
 	pauseCh chan interface{}
 }
 
-func NewFetcher() *Fetcher {
-	return &Fetcher{
-		DefaultFetcher: new(fetcher.DefaultFetcher),
-		pauseCh:        make(chan interface{}),
-	}
-}
-
-var protocols = []string{"HTTP", "HTTPS"}
-
-func FetcherBuilder() ([]string, func() fetcher.Fetcher) {
-	return protocols, func() fetcher.Fetcher {
-		return NewFetcher()
-	}
-}
-
 func (f *Fetcher) Resolve(req *base.Request) (*base.Resource, error) {
 	httpReq, err := buildRequest(nil, req)
 	if err != nil {
@@ -91,7 +76,7 @@ func (f *Fetcher) Resolve(req *base.Request) (*base.Resource, error) {
 			if err != nil {
 				return nil, err
 			}
-			res.TotalSize = parse
+			res.Length = parse
 		}
 	} else if base.HttpCodeOK == httpResp.StatusCode {
 		// 返回200响应码，不支持断点下载，通过Content-Length头获取文件大小，获取不到的话可能是chunked编码
@@ -101,13 +86,13 @@ func (f *Fetcher) Resolve(req *base.Request) (*base.Resource, error) {
 			if err != nil {
 				return nil, err
 			}
-			res.TotalSize = parse
+			res.Length = parse
 		}
 	} else {
 		return nil, NewRequestError(httpResp.StatusCode, httpResp.Status)
 	}
 	file := &base.FileInfo{
-		Size: res.TotalSize,
+		Size: res.Length,
 	}
 	contentDisposition := httpResp.Header.Get(base.HttpHeaderContentDisposition)
 	if contentDisposition != "" {
@@ -139,14 +124,14 @@ func (f *Fetcher) Create(res *base.Resource, opts *base.Options) error {
 func (f *Fetcher) Start() (err error) {
 	// 创建文件
 	name := f.filename()
-	_, err = f.Ctl.Touch(name, f.res.TotalSize)
+	_, err = f.Ctl.Touch(name, f.res.Length)
 	if err != nil {
 		return err
 	}
 	f.status = base.DownloadStatusStart
 	if f.res.Range {
 		// 每个连接平均需要下载的分块大小
-		chunkSize := f.res.TotalSize / int64(f.opts.Connections)
+		chunkSize := f.res.Length / int64(f.opts.Connections)
 		f.chunks = make([]*Chunk, f.opts.Connections)
 		f.clients = make([]*http.Response, f.opts.Connections)
 		for i := 0; i < f.opts.Connections; i++ {
@@ -156,7 +141,7 @@ func (f *Fetcher) Start() (err error) {
 			)
 			if i == f.opts.Connections-1 {
 				// 最后一个分块需要保证把文件下载完
-				end = f.res.TotalSize - 1
+				end = f.res.Length - 1
 			} else {
 				end = begin + chunkSize - 1
 			}
@@ -340,7 +325,7 @@ func buildClient() *http.Client {
 	jar, _ := cookiejar.New(nil)
 	return &http.Client{
 		Jar:     jar,
-		Timeout: time.Second * 10,
+		Timeout: time.Second * 60,
 	}
 }
 
@@ -385,3 +370,40 @@ func buildRequest(ctx context.Context, req *base.Request) (httpReq *http.Request
 	httpReq.Header = headers
 	return httpReq, nil
 }
+
+type FetcherData struct {
+	Chunks []*Chunk
+}
+
+type FetcherBuilder struct {
+}
+
+var schemes = []string{"HTTP", "HTTPS"}
+
+func (fb *FetcherBuilder) Schemes() []string {
+	return schemes
+}
+
+func (fb *FetcherBuilder) Build() fetcher.Fetcher {
+	return &Fetcher{
+		DefaultFetcher: new(fetcher.DefaultFetcher),
+		pauseCh:        make(chan interface{}),
+	}
+}
+
+func (fb *FetcherBuilder) Store(f fetcher.Fetcher) interface{} {
+	_f := f.(*Fetcher)
+	return &FetcherData{
+		Chunks: _f.chunks,
+	}
+}
+
+func (fb *FetcherBuilder) Resume(res *base.Resource, opts *base.Options, data interface{}) fetcher.Fetcher {
+	fetcher := new(FetcherBuilder).Build().(*Fetcher)
+	fs := data.(*FetcherData)
+	fetcher.res = res
+	fetcher.opts = opts
+	fetcher.chunks = fs.Chunks
+	fetcher.status = base.DownloadStatusPause
+	return fetcher
+}

internal/protocol/http/fetcher_test.go

@@ -13,8 +13,8 @@ import (
 
 func TestFetcher_Resolve(t *testing.T) {
 	testResolve(test.StartTestFileServer, &base.Resource{
-		TotalSize: test.BuildSize,
-		Range:     true,
+		Length: test.BuildSize,
+		Range:  true,
 		Files: []*base.FileInfo{
 			{
 				Name: test.BuildName,
@@ -23,8 +23,8 @@ func TestFetcher_Resolve(t *testing.T) {
 		},
 	}, t)
 	testResolve(test.StartTestChunkedServer, &base.Resource{
-		TotalSize: 0,
-		Range:     false,
+		Length: 0,
+		Range:  false,
 		Files: []*base.FileInfo{
 			{
 				Name: test.BuildName,
@@ -37,7 +37,7 @@ func TestFetcher_Resolve(t *testing.T) {
 func testResolve(startTestServer func() net.Listener, want *base.Resource, t *testing.T) {
 	listener := startTestServer()
 	defer listener.Close()
-	fetcher := NewFetcher()
+	fetcher := buildFetcher()
 	res, err := fetcher.Resolve(&base.Request{
 		URL: "http://" + listener.Addr().String() + "/" + test.BuildName,
 	})
@@ -92,29 +92,38 @@ func TestFetcher_DownloadError(t *testing.T) {
 	downloadError(listener, 1, t)
 }
 
-func downloadReady(listener net.Listener, connections int, t *testing.T) fetcher.Fetcher {
-	fetcher := NewFetcher()
-	fetcher.Setup(controller.NewController())
+func TestFetcher_DownloadResume(t *testing.T) {
+	listener := test.StartTestFileServer()
+	defer listener.Close()
+
+	downloadResume(listener, 1, t)
+	downloadResume(listener, 5, t)
+	downloadResume(listener, 8, t)
+	downloadResume(listener, 16, t)
+}
+
+func downloadReady(listener net.Listener, connections int, t *testing.T) (fetcher fetcher.Fetcher, res *base.Resource, opts *base.Options) {
+	fetcher = buildFetcher()
 	res, err := fetcher.Resolve(&base.Request{
 		URL: "http://" + listener.Addr().String() + "/" + test.BuildName,
 	})
 	if err != nil {
 		t.Fatal(err)
 	}
-	err = fetcher.Create(res, &base.Options{
+	opts = &base.Options{
 		Name:        test.DownloadName,
 		Path:        test.Dir,
 		Connections: connections,
-	})
+	}
+	err = fetcher.Create(res, opts)
 	if err != nil {
 		t.Fatal(err)
 	}
-	return fetcher
-
+	return
 }
 
 func downloadNormal(listener net.Listener, connections int, t *testing.T) {
-	fetcher := downloadReady(listener, connections, t)
+	fetcher, _, _ := downloadReady(listener, connections, t)
 	err := fetcher.Start()
 	if err != nil {
 		t.Fatal(err)
@@ -131,7 +140,7 @@ func downloadNormal(listener net.Listener, connections int, t *testing.T) {
 }
 
 func downloadContinue(listener net.Listener, connections int, t *testing.T) {
-	fetcher := downloadReady(listener, connections, t)
+	fetcher, _, _ := downloadReady(listener, connections, t)
 	err := fetcher.Start()
 	if err != nil {
 		t.Fatal(err)
@@ -156,7 +165,7 @@ func downloadContinue(listener net.Listener, connections int, t *testing.T) {
 }
 
 func downloadError(listener net.Listener, connections int, t *testing.T) {
-	fetcher := downloadReady(listener, connections, t)
+	fetcher, _, _ := downloadReady(listener, connections, t)
 	err := fetcher.Start()
 	if err != nil {
 		t.Fatal(err)
@@ -166,3 +175,37 @@ func downloadError(listener net.Listener, connections int, t *testing.T) {
 		t.Errorf("Download error = %v, want %v", err, nil)
 	}
 }
+
+func downloadResume(listener net.Listener, connections int, t *testing.T) {
+	fetcher, res, opts := downloadReady(listener, connections, t)
+	err := fetcher.Start()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	fb := new(FetcherBuilder)
+	time.Sleep(time.Second * 2)
+	data := fb.Store(fetcher)
+	time.Sleep(time.Second * 1)
+	fetcher.Pause()
+
+	fetcher = fb.Resume(res, opts, data)
+	fetcher.Setup(controller.NewController())
+	fetcher.Continue()
+
+	err = fetcher.Wait()
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := test.FileMd5(test.BuildFile)
+	got := test.FileMd5(test.DownloadFile)
+	if want != got {
+		t.Errorf("Download error = %v, want %v", got, want)
+	}
+}
+
+func buildFetcher() *Fetcher {
+	fetcher := new(FetcherBuilder).Build()
+	fetcher.Setup(controller.NewController())
+	return fetcher.(*Fetcher)
+}

pkg/base/constants.go

@@ -5,7 +5,8 @@ import "errors"
 type Status int
 
 const (
-	DownloadStatusReady Status = iota
+	DownloadStatusPrepare Status = iota
+	DownloadStatusReady
 	DownloadStatusStart
 	DownloadStatusPause
 	DownloadStatusError

pkg/base/model.go

@@ -2,6 +2,8 @@ package base
 
 // 下载请求
 type Request struct {
+	// 下载链接
+	Schema string
 	// 下载链接
 	URL string
 	// 附加信息
@@ -12,7 +14,7 @@ type Request struct {
 type Resource struct {
 	Req *Request
 	// 资源总大小
-	TotalSize int64
+	Length int64
 	// 是否支持断点下载
 	Range bool
 	// 资源所包含的文件列表
@@ -33,4 +35,6 @@ type Options struct {
 	Path string
 	// 并发连接数
 	Connections int
+	// 下载的文件下标列表
+	SelectFiles []int
 }

pkg/download/downloader.go

@@ -2,34 +2,19 @@ package download
 
 import (
 	"errors"
-	"github.com/google/uuid"
 	"github.com/monkeyWie/gopeed-core/internal/controller"
 	"github.com/monkeyWie/gopeed-core/internal/fetcher"
+	"github.com/monkeyWie/gopeed-core/internal/protocol/bt"
 	"github.com/monkeyWie/gopeed-core/internal/protocol/http"
 	"github.com/monkeyWie/gopeed-core/pkg/base"
 	"github.com/monkeyWie/gopeed-core/pkg/util"
-	"net/url"
 	"strings"
 	"sync"
 	"time"
 )
 
-type FetcherBuilder func() (protocols []string, builder func() fetcher.Fetcher)
 type Listener func(event *Event)
 
-type TaskInfo struct {
-	ID       string
-	Res      *base.Resource
-	Opts     *base.Options
-	Status   base.Status
-	Files    map[string]*base.FileInfo
-	Progress *Progress
-
-	fetcher fetcher.Fetcher
-	timer   *util.Timer
-	locker  *sync.Mutex
-}
-
 type Progress struct {
 	// 下载耗时(纳秒)
 	Used int64
@@ -41,28 +26,28 @@ type Progress struct {
 
 type Downloader struct {
 	*controller.DefaultController
-	fetchBuilders map[string]func() fetcher.Fetcher
-	tasks         map[string]*TaskInfo
+	fetchBuilders map[string]fetcher.FetcherBuilder
+	tasks         map[string]*Task
 	listener      Listener
 }
 
-func NewDownloader(fbs ...FetcherBuilder) *Downloader {
+func NewDownloader(fbs ...fetcher.FetcherBuilder) *Downloader {
 	d := &Downloader{DefaultController: controller.NewController()}
-	d.fetchBuilders = make(map[string]func() fetcher.Fetcher)
+	d.fetchBuilders = make(map[string]fetcher.FetcherBuilder)
 	for _, f := range fbs {
-		protocols, builder := f()
-		for _, p := range protocols {
-			d.fetchBuilders[strings.ToUpper(p)] = builder
+		for _, p := range f.Schemes() {
+			d.fetchBuilders[strings.ToUpper(p)] = f
 		}
 	}
-	d.tasks = make(map[string]*TaskInfo)
+	d.tasks = make(map[string]*Task)
 
 	// 每秒统计一次下载速度
 	go func() {
 		for {
 			if len(d.tasks) > 0 {
 				for _, task := range d.tasks {
-					if task.Status == base.DownloadStatusDone ||
+					if task.Status == base.DownloadStatusPrepare ||
+						task.Status == base.DownloadStatusDone ||
 						task.Status == base.DownloadStatusError ||
 						task.Status == base.DownloadStatusPause {
 						continue
@@ -80,31 +65,41 @@ func NewDownloader(fbs ...FetcherBuilder) *Downloader {
 	return d
 }
 
-func (d *Downloader) buildFetcher(URL string) (fetcher.Fetcher, error) {
-	url, err := url.Parse(URL)
-	if err != nil {
-		return nil, err
+func (d *Downloader) buildFetcher(url string) (fetcher.Fetcher, error) {
+	schema := util.ParseSchema(url)
+	fetchBuilder, ok := d.fetchBuilders[schema]
+	if !ok {
+		fetchBuilder, ok = d.fetchBuilders[util.FileSchema]
 	}
-	if fetchBuilder, ok := d.fetchBuilders[strings.ToUpper(url.Scheme)]; ok {
-		fetcher := fetchBuilder()
+	if ok {
+		fetcher := fetchBuilder.Build()
 		fetcher.Setup(d.DefaultController)
 		return fetcher, nil
 	}
 	return nil, errors.New("unsupported protocol")
 }
 
-func (d *Downloader) Resolve(req *base.Request) (*base.Resource, error) {
+func (d *Downloader) Resolve(req *base.Request) (string, *base.Resource, error) {
 	fetcher, err := d.buildFetcher(req.URL)
 	if err != nil {
-		return nil, err
+		return "", nil, err
 	}
-	return fetcher.Resolve(req)
+	res, err := fetcher.Resolve(req)
+	if err != nil {
+		return "", nil, err
+	}
+	task := NewTask()
+	task.fetcher = fetcher
+	task.Res = res
+	d.tasks[task.ID] = task
+	return task.ID, res, nil
 }
 
-func (d *Downloader) Create(res *base.Resource, opts *base.Options) (err error) {
-	fetcher, err := d.buildFetcher(res.Req.URL)
-	if err != nil {
-		return
+func (d *Downloader) Create(taskID string, res *base.Resource, opts *base.Options) (err error) {
+	task := d.tasks[taskID]
+	fetcher := d.tasks[taskID].fetcher
+	if opts == nil {
+		opts = &base.Options{}
 	}
 	if !res.Range || opts.Connections < 1 {
 		opts.Connections = 1
@@ -113,18 +108,11 @@ func (d *Downloader) Create(res *base.Resource, opts *base.Options) (err error)
 	if err != nil {
 		return
 	}
-	id := uuid.New().String()
-	task := &TaskInfo{
-		ID:       id,
-		Res:      res,
-		Opts:     opts,
-		Status:   base.DownloadStatusReady,
-		Progress: &Progress{},
-		fetcher:  fetcher,
-		timer:    &util.Timer{},
-		locker:   new(sync.Mutex),
-	}
-	d.tasks[id] = task
+	task.Opts = opts
+	task.Status = base.DownloadStatusReady
+	task.Progress = &Progress{}
+	task.timer = &util.Timer{}
+	task.locker = new(sync.Mutex)
 	task.timer.Start()
 	d.emit(EventKeyStart, task)
 	err = fetcher.Start()
@@ -137,15 +125,15 @@ func (d *Downloader) Create(res *base.Resource, opts *base.Options) (err error)
 			d.emit(EventKeyError, task, err)
 		} else {
 			task.Progress.Used = task.timer.Used()
-			if task.Res.TotalSize == 0 {
-				task.Res.TotalSize = task.fetcher.Progress().TotalDownloaded()
+			if task.Res.Length == 0 {
+				task.Res.Length = task.fetcher.Progress().TotalDownloaded()
 			}
 			used := task.Progress.Used / int64(time.Second)
 			if used == 0 {
 				used = 1
 			}
-			task.Progress.Speed = task.Res.TotalSize / used
-			task.Progress.Downloaded = task.Res.TotalSize
+			task.Progress.Speed = task.Res.Length / used
+			task.Progress.Downloaded = task.Res.Length
 			d.emit(EventKeyDone, task)
 		}
 		d.emit(EventKeyFinally, task, err)
@@ -175,7 +163,7 @@ func (d *Downloader) Listener(fn Listener) {
 	d.listener = fn
 }
 
-func (d *Downloader) emit(eventKey EventKey, task *TaskInfo, errs ...error) {
+func (d *Downloader) emit(eventKey EventKey, task *Task, errs ...error) {
 	if d.listener != nil {
 		var err error
 		if len(errs) > 0 {
@@ -189,7 +177,7 @@ func (d *Downloader) emit(eventKey EventKey, task *TaskInfo, errs ...error) {
 	}
 }
 
-var defaultDownloader = NewDownloader(http.FetcherBuilder)
+var defaultDownloader = NewDownloader(new(http.FetcherBuilder), new(bt.FetcherBuilder))
 
 type boot struct {
 	url      string
@@ -207,7 +195,7 @@ func (b *boot) Extra(extra interface{}) *boot {
 	return b
 }
 
-func (b *boot) Resolve() (*base.Resource, error) {
+func (b *boot) Resolve() (string, *base.Resource, error) {
 	return defaultDownloader.Resolve(&base.Request{
 		URL:   b.url,
 		Extra: b.extra,
@@ -220,12 +208,12 @@ func (b *boot) Listener(listener Listener) *boot {
 }
 
 func (b *boot) Create(opts *base.Options) error {
-	res, err := b.Resolve()
+	taskID, res, err := b.Resolve()
 	if err != nil {
 		return err
 	}
 	defaultDownloader.Listener(b.listener)
-	return defaultDownloader.Create(res, opts)
+	return defaultDownloader.Create(taskID, res, opts)
 }
 
 func Boot() *boot {

pkg/download/downloader_test.go

@@ -13,18 +13,18 @@ func TestDownloader_Resolve(t *testing.T) {
 	listener := test.StartTestFileServer()
 	defer listener.Close()
 
-	downloader := NewDownloader(http.FetcherBuilder)
+	downloader := NewDownloader(new(http.FetcherBuilder))
 	req := &base.Request{
 		URL: "http://" + listener.Addr().String() + "/" + test.BuildName,
 	}
-	res, err := downloader.Resolve(req)
+	_, res, err := downloader.Resolve(req)
 	if err != nil {
 		t.Fatal(err)
 	}
 	want := &base.Resource{
-		Req:       req,
-		TotalSize: test.BuildSize,
-		Range:     true,
+		Req:    req,
+		Length: test.BuildSize,
+		Range:  true,
 		Files: []*base.FileInfo{
 			{
 				Name: test.BuildName,
@@ -42,11 +42,11 @@ func TestDownloader_Create(t *testing.T) {
 	listener := test.StartTestFileServer()
 	defer listener.Close()
 
-	downloader := NewDownloader(http.FetcherBuilder)
+	downloader := NewDownloader(new(http.FetcherBuilder))
 	req := &base.Request{
 		URL: "http://" + listener.Addr().String() + "/" + test.BuildName,
 	}
-	res, err := downloader.Resolve(req)
+	taskID, res, err := downloader.Resolve(req)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -58,7 +58,7 @@ func TestDownloader_Create(t *testing.T) {
 			wg.Done()
 		}
 	})
-	err = downloader.Create(res, &base.Options{
+	err = downloader.Create(taskID, res, &base.Options{
 		Path:        test.Dir,
 		Name:        test.DownloadName,
 		Connections: 4,

pkg/download/event.go

@@ -14,6 +14,6 @@ const (
 
 type Event struct {
 	Key  EventKey
-	Task *TaskInfo
+	Task *Task
 	Err  error
 }

pkg/download/task.go

@@ -0,0 +1,29 @@
+package download
+
+import (
+	"github.com/google/uuid"
+	"github.com/monkeyWie/gopeed-core/internal/fetcher"
+	"github.com/monkeyWie/gopeed-core/pkg/base"
+	"github.com/monkeyWie/gopeed-core/pkg/util"
+	"sync"
+)
+
+type Task struct {
+	ID       string
+	Res      *base.Resource
+	Opts     *base.Options
+	Status   base.Status
+	Files    map[string]*base.FileInfo
+	Progress *Progress
+
+	fetcher fetcher.Fetcher
+	timer   *util.Timer
+	locker  *sync.Mutex
+}
+
+func NewTask() *Task {
+	return &Task{
+		ID:     uuid.New().String(),
+		Status: base.DownloadStatusPrepare,
+	}
+}

pkg/util/url.go

@@ -0,0 +1,13 @@
+package util
+
+import "strings"
+
+const FileSchema = "FILE"
+
+func ParseSchema(url string) string {
+	index := strings.Index(url, ":")
+	if index == -1 {
+		return FileSchema
+	}
+	return strings.ToUpper(url[:index])
+}