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7 changed files with 0 additions and 742 deletions

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@ -1,23 +0,0 @@
package base
type Status int
const (
DownloadStatusReady Status = iota
DownloadStatusStart
DownloadStatusPause
DownloadStatusError
DownloadStatusDone
)
const (
HttpCodeOK = 200
HttpCodePartialContent = 206
HttpHeaderRange = "Range"
HttpHeaderContentLength = "Content-Length"
HttpHeaderContentRange = "Content-Range"
HttpHeaderContentDisposition = "Content-Disposition"
HttpHeaderRangeFormat = "bytes=%d-%d"
)

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@ -1,37 +0,0 @@
package base
// Request 下载请求
type Request struct {
// 下载链接
URL string
// 附加信息
Extra any
}
// Resource 资源信息
type Resource struct {
Req *Request
// 资源总大小
TotalSize int64
// 是否支持断点下载
Range bool
// 资源所包含的文件列表
Files []*FileInfo
}
// FileInfo 文件信息
type FileInfo struct {
Name string
Path string
Size int64
}
// Options 下载选项
type Options struct {
// 保存文件名
Name string
// 保存目录
Path string
// 并发连接数
Connections int
}

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@ -1,172 +0,0 @@
package controller
import (
"golang.org/x/net/proxy"
"net"
"net/http"
"net/url"
"os"
"time"
)
type Controller interface {
Touch(name string, size int64) (file *os.File, err error)
Open(name string) (file *os.File, err error)
Write(name string, offset int64, buf []byte) (int, error)
Close(name string) error
ContextDialer() (proxy.Dialer, error)
ContextCookie() http.CookieJar
ContextTimeout() time.Duration
ContextProxy() func(*http.Request) (*url.URL, error)
}
type Option func(*option)
type option struct {
CookieJar http.CookieJar
Timeout time.Duration
Dialer proxy.Dialer
Proxy func(*http.Request) (*url.URL, error)
}
func WithCookie(cookieJar http.CookieJar) Option {
return func(opt *option) {
opt.CookieJar = cookieJar
}
}
func WithTimeout(timeout time.Duration) Option {
return func(opt *option) {
opt.Timeout = timeout
}
}
func WithDialer(dialer proxy.Dialer) Option {
return func(opt *option) {
opt.Dialer = dialer
}
}
func WithProxy(fn func(*http.Request) (*url.URL, error)) Option {
return func(opt *option) {
opt.Proxy = fn
}
}
type DefaultController struct {
*option
Files map[string]*os.File
}
func NewController(options ...Option) *DefaultController {
opt := new(option)
for _, f := range options {
f(opt)
}
if opt.Timeout == 0 {
opt.Timeout = time.Second * 30
}
if opt.Dialer == nil {
opt.Dialer = proxy.FromEnvironment()
}
return &DefaultController{
Files: make(map[string]*os.File),
option: opt,
}
}
func (c *DefaultController) Touch(name string, size int64) (file *os.File, err error) {
file, err = os.Create(name)
if size > 0 {
err = os.Truncate(name, size)
if err != nil {
return nil, err
}
}
if err == nil {
c.Files[name] = file
}
return
}
func (c *DefaultController) Open(name string) (file *os.File, err error) {
file, err = os.OpenFile(name, os.O_RDWR, os.ModePerm)
if err == nil {
c.Files[name] = file
}
return
}
func (c *DefaultController) Write(name string, offset int64, buf []byte) (int, error) {
return c.Files[name].WriteAt(buf, offset)
}
func (c *DefaultController) Close(name string) error {
err := c.Files[name].Close()
delete(c.Files, name)
return err
}
func (c *DefaultController) ContextDialer() (proxy.Dialer, error) {
return &DialerWarp{dialer: c.Dialer}, nil
}
func (c *DefaultController) ContextCookie() http.CookieJar {
return c.CookieJar
}
func (c *DefaultController) ContextTimeout() time.Duration {
return c.Timeout
}
func (c *DefaultController) ContextProxy() func(*http.Request) (*url.URL, error) {
return c.Proxy
}
type DialerWarp struct {
dialer proxy.Dialer
}
type ConnWarp struct {
conn net.Conn
}
func (c *ConnWarp) Read(b []byte) (n int, err error) {
return c.conn.Read(b)
}
func (c *ConnWarp) Write(b []byte) (n int, err error) {
return c.conn.Write(b)
}
func (c *ConnWarp) Close() error {
return c.conn.Close()
}
func (c *ConnWarp) LocalAddr() net.Addr {
return c.conn.LocalAddr()
}
func (c *ConnWarp) RemoteAddr() net.Addr {
return c.conn.RemoteAddr()
}
func (c *ConnWarp) SetDeadline(t time.Time) error {
return c.conn.SetDeadline(t)
}
func (c *ConnWarp) SetReadDeadline(t time.Time) error {
return c.conn.SetReadDeadline(t)
}
func (c *ConnWarp) SetWriteDeadline(t time.Time) error {
return c.conn.SetWriteDeadline(t)
}
func (d *DialerWarp) Dial(network, addr string) (c net.Conn, err error) {
conn, err := d.dialer.Dial(network, addr)
if err != nil {
return nil, err
}
return &ConnWarp{conn: conn}, nil
}

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@ -1,52 +0,0 @@
package fetcher
import (
"gitea.bvbej.com/bvbej/base-golang/pkg/downloader/base"
"gitea.bvbej.com/bvbej/base-golang/pkg/downloader/controller"
)
// Fetcher 对应协议的下载支持
type Fetcher interface {
// Setup 设置文件相关信息
Setup(ctl controller.Controller)
// Resolve 解析请求
Resolve(req *base.Request) (res *base.Resource, err error)
// Create 创建任务
Create(res *base.Resource, opts *base.Options) (err error)
// Start 开始
Start() (err error)
// Pause 暂停
Pause() (err error)
// Continue 继续
Continue() (err error)
// Progress 获取任务各个文件下载进度
Progress() Progress
// Wait 该方法会一直阻塞,直到任务下载结束
Wait() (err error)
}
type DefaultFetcher struct {
Ctl controller.Controller
DoneCh chan error
}
func (f *DefaultFetcher) Setup(ctl controller.Controller) {
f.Ctl = ctl
f.DoneCh = make(chan error, 1)
}
func (f *DefaultFetcher) Wait() (err error) {
return <-f.DoneCh
}
// Progress 获取任务中各个文件的已下载字节数
type Progress []int64
// TotalDownloaded 获取任务总下载字节数
func (p Progress) TotalDownloaded() int64 {
total := int64(0)
for _, d := range p {
total += d
}
return total
}

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@ -1,409 +0,0 @@
package http
import (
"bytes"
"context"
"fmt"
"gitea.bvbej.com/bvbej/base-golang/pkg/downloader/base"
"gitea.bvbej.com/bvbej/base-golang/pkg/downloader/fetcher"
"golang.org/x/sync/errgroup"
"io"
"mime"
"net"
"net/http"
"net/url"
"path"
"path/filepath"
"strconv"
"strings"
"time"
)
type RequestError struct {
Code int
Msg string
}
func NewRequestError(code int, msg string) *RequestError {
return &RequestError{Code: code, Msg: msg}
}
func (re *RequestError) Error() string {
return fmt.Sprintf("http request fail,code:%d", re.Code)
}
type Fetcher struct {
*fetcher.DefaultFetcher
res *base.Resource
opts *base.Options
status base.Status
clients []*http.Response
chunks []*Chunk
ctx context.Context
cancel context.CancelFunc
pauseCh chan any
}
func NewFetcher() *Fetcher {
return &Fetcher{
DefaultFetcher: new(fetcher.DefaultFetcher),
pauseCh: make(chan any),
}
}
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 := f.buildRequest(nil, req)
if err != nil {
return nil, err
}
client, err := f.buildClient()
if err != nil {
return nil, err
}
// 只访问一个字节测试资源是否支持Range请求
httpReq.Header.Set(base.HttpHeaderRange, fmt.Sprintf(base.HttpHeaderRangeFormat, 0, 0))
httpResp, err := client.Do(httpReq)
if err != nil {
return nil, err
}
// 拿到响应头就关闭不用加defer
_ = httpResp.Body.Close()
res := &base.Resource{
Req: req,
Range: false,
Files: []*base.FileInfo{},
}
if base.HttpCodePartialContent == httpResp.StatusCode {
// 返回206响应码表示支持断点下载
res.Range = true
// 解析资源大小: bytes 0-1000/1001 => 1001
contentTotal := path.Base(httpResp.Header.Get(base.HttpHeaderContentRange))
if contentTotal != "" {
parse, err := strconv.ParseInt(contentTotal, 10, 64)
if err != nil {
return nil, err
}
res.TotalSize = 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
contentLength := httpResp.Header.Get(base.HttpHeaderContentLength)
if contentLength != "" {
parse, err := strconv.ParseInt(contentLength, 10, 64)
if err != nil {
return nil, err
}
res.TotalSize = parse
}
} else {
return nil, NewRequestError(httpResp.StatusCode, httpResp.Status)
}
file := &base.FileInfo{
Size: res.TotalSize,
}
contentDisposition := httpResp.Header.Get(base.HttpHeaderContentDisposition)
if contentDisposition != "" {
_, params, _ := mime.ParseMediaType(contentDisposition)
filename := params["filename"]
if filename != "" {
file.Name = filename
}
}
// Get file filename by URL
if file.Name == "" && strings.Count(req.URL, "/") > 2 {
file.Name = filepath.Base(req.URL)
}
// unknown file filename
if file.Name == "" {
file.Name = "unknown"
}
res.Files = append(res.Files, file)
return res, nil
}
func (f *Fetcher) Create(res *base.Resource, opts *base.Options) error {
f.res = res
f.opts = opts
f.status = base.DownloadStatusReady
return nil
}
func (f *Fetcher) Start() (err error) {
// 创建文件
name := f.filename()
_, err = f.Ctl.Touch(name, f.res.TotalSize)
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)
f.chunks = make([]*Chunk, f.opts.Connections)
f.clients = make([]*http.Response, f.opts.Connections)
for i := 0; i < f.opts.Connections; i++ {
var (
begin = chunkSize * int64(i)
end int64
)
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
} else {
end = begin + chunkSize - 1
}
chunk := NewChunk(begin, end)
f.chunks[i] = chunk
}
} else {
// 只支持单连接下载
f.chunks = make([]*Chunk, 1)
f.clients = make([]*http.Response, 1)
f.chunks[0] = NewChunk(0, 0)
}
f.fetch()
return
}
func (f *Fetcher) Pause() (err error) {
if base.DownloadStatusStart != f.status {
return
}
f.status = base.DownloadStatusPause
f.cancel()
<-f.pauseCh
return
}
func (f *Fetcher) Continue() (err error) {
if base.DownloadStatusStart == f.status || base.DownloadStatusDone == f.status {
return
}
f.status = base.DownloadStatusStart
var name = f.filename()
_, err = f.Ctl.Open(name)
if err != nil {
return err
}
f.fetch()
return
}
func (f *Fetcher) Progress() fetcher.Progress {
p := make(fetcher.Progress, 0)
if len(f.chunks) > 0 {
total := int64(0)
for _, chunk := range f.chunks {
total += chunk.Downloaded
}
p = append(p, total)
}
return p
}
func (f *Fetcher) filename() string {
// 创建文件
var filename = f.opts.Name
if filename == "" {
filename = f.res.Files[0].Name
}
return filepath.Join(f.opts.Path, filename)
}
func (f *Fetcher) fetch() {
f.ctx, f.cancel = context.WithCancel(context.Background())
eg, _ := errgroup.WithContext(f.ctx)
for i := 0; i < f.opts.Connections; i++ {
eg.Go(func() error {
return f.fetchChunk(i)
})
}
go func() {
err := eg.Wait()
// 下载停止,关闭文件句柄
_ = f.Ctl.Close(f.filename())
if f.status == base.DownloadStatusPause {
f.pauseCh <- nil
} else {
if err != nil {
f.status = base.DownloadStatusError
} else {
f.status = base.DownloadStatusDone
}
f.DoneCh <- err
}
}()
}
func (f *Fetcher) fetchChunk(index int) (err error) {
filename := f.filename()
chunk := f.chunks[index]
httpReq, err := f.buildRequest(f.ctx, f.res.Req)
if err != nil {
return err
}
client, err := f.buildClient()
if err != nil {
return err
}
var buf = make([]byte, 8192)
// 重试10次
for i := 0; i < 10; i++ {
// 如果下载完成直接返回
if chunk.Status == base.DownloadStatusDone {
return
}
// 如果已暂停直接跳出
if f.status == base.DownloadStatusPause {
break
}
var (
resp *http.Response
retry bool
)
if f.res.Range {
httpReq.Header.Set(base.HttpHeaderRange,
fmt.Sprintf(base.HttpHeaderRangeFormat, chunk.Begin+chunk.Downloaded, chunk.End))
} else {
chunk.Downloaded = 0
}
err = func() error {
resp, err = client.Do(httpReq)
if err != nil {
return err
}
f.clients[index] = resp
if resp.StatusCode != base.HttpCodeOK && resp.StatusCode != base.HttpCodePartialContent {
err = NewRequestError(resp.StatusCode, resp.Status)
return err
}
return nil
}()
if err != nil {
//请求失败3s后重试
time.Sleep(time.Second * 3)
continue
}
// 请求成功就重置错误次数连续失败10次才终止
i = 0
retry, err = func() (bool, error) {
defer func() {
_ = resp.Body.Close()
}()
var n int
for {
n, err = resp.Body.Read(buf)
if n > 0 {
_, err = f.Ctl.Write(filename, chunk.Begin+chunk.Downloaded, buf[:n])
if err != nil {
return false, err
}
chunk.Downloaded += int64(n)
}
if err != nil {
if err != io.EOF {
return true, err
}
break
}
}
return false, nil
}()
if !retry {
// 下载成功,跳出重试
break
}
}
if f.status == base.DownloadStatusPause {
chunk.Status = base.DownloadStatusPause
} else if chunk.Downloaded >= chunk.End-chunk.Begin+1 {
chunk.Status = base.DownloadStatusDone
} else {
if err != nil {
chunk.Status = base.DownloadStatusError
} else {
chunk.Status = base.DownloadStatusDone
}
}
return
}
func (f *Fetcher) buildClient() (*http.Client, error) {
dialer, err := f.Ctl.ContextDialer()
if err != nil {
return nil, err
}
transport := &http.Transport{
DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
return dialer.Dial(network, addr)
},
}
if f.Ctl.ContextProxy() != nil {
transport.Proxy = f.Ctl.ContextProxy()
}
return &http.Client{
Jar: f.Ctl.ContextCookie(),
Timeout: f.Ctl.ContextTimeout(),
Transport: transport,
}, nil
}
func (f *Fetcher) buildRequest(ctx context.Context, req *base.Request) (httpReq *http.Request, err error) {
reqUrl, err := url.Parse(req.URL)
if err != nil {
return
}
var (
method string
body io.Reader
)
headers := make(map[string][]string)
if req.Extra == nil {
method = http.MethodGet
} else {
extra := req.Extra.(Extra)
if extra.Method != "" {
method = extra.Method
} else {
method = http.MethodGet
}
if len(extra.Header) > 0 {
for k, v := range extra.Header {
headers[k] = []string{v}
}
}
if extra.Body != "" {
body = io.NopCloser(bytes.NewBufferString(extra.Body))
}
}
if ctx != nil {
httpReq, err = http.NewRequestWithContext(ctx, method, reqUrl.String(), body)
} else {
httpReq, err = http.NewRequest(method, reqUrl.String(), body)
}
if err != nil {
return
}
httpReq.Header = headers
return httpReq, nil
}

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@ -1,24 +0,0 @@
package http
import "gitea.bvbej.com/bvbej/base-golang/pkg/downloader/base"
type Chunk struct {
Status base.Status
Begin int64
End int64
Downloaded int64
}
func NewChunk(begin int64, end int64) *Chunk {
return &Chunk{
Status: base.DownloadStatusReady,
Begin: begin,
End: end,
}
}
type Extra struct {
Method string
Header map[string]string
Body string
}

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@ -1,25 +0,0 @@
package util
import "time"
// Timer 计时器
type Timer struct {
t int64
used int64
}
func (t *Timer) Start() {
t.t = time.Now().UnixNano()
}
func (t *Timer) Pause() {
t.used += time.Now().UnixNano() - t.t
}
func (t *Timer) Continue() {
t.t = time.Now().UnixNano()
}
func (t *Timer) Used() int64 {
return (time.Now().UnixNano() - t.t) + t.used
}