127 lines
3.0 KiB
Go
127 lines
3.0 KiB
Go
package backend_golang
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import (
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"context"
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"path/filepath"
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"time"
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"github.com/cavaliergopher/grab/v3"
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"github.com/wailsapp/wails/v2/pkg/runtime"
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)
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func (a *App) DownloadFile(path string, url string) error {
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_, err := grab.Get(a.exDir+path, url)
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if err != nil {
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return err
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}
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return nil
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}
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type DownloadStatus struct {
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resp *grab.Response
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cancel context.CancelFunc
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Name string `json:"name"`
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Path string `json:"path"`
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Url string `json:"url"`
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Transferred int64 `json:"transferred"`
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Size int64 `json:"size"`
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Speed float64 `json:"speed"`
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Progress float64 `json:"progress"`
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Downloading bool `json:"downloading"`
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Done bool `json:"done"`
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}
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var downloadList []*DownloadStatus
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func existsInDownloadList(path string, url string) bool {
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for _, ds := range downloadList {
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if ds.Path == path || ds.Url == url {
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return true
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}
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}
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return false
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}
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func (a *App) PauseDownload(url string) {
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for _, ds := range downloadList {
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if ds.Url == url {
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if ds.cancel != nil {
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ds.cancel()
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}
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ds.resp = nil
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ds.Downloading = false
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ds.Speed = 0
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break
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}
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}
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}
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func (a *App) ContinueDownload(url string) {
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for _, ds := range downloadList {
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if ds.Url == url {
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if !ds.Downloading && ds.resp == nil && !ds.Done {
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ds.Downloading = true
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req, err := grab.NewRequest(ds.Path, ds.Url)
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if err != nil {
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ds.Downloading = false
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break
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}
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// if PauseDownload() is called before the request finished, ds.Downloading will be false
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// if the user keeps clicking pause and resume, it may result in multiple requests being successfully downloaded at the same time
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// so we have to create a context and cancel it when PauseDownload() is called
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ctx, cancel := context.WithCancel(context.Background())
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ds.cancel = cancel
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req = req.WithContext(ctx)
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resp := grab.DefaultClient.Do(req)
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if resp != nil && resp.HTTPResponse != nil &&
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resp.HTTPResponse.StatusCode >= 200 && resp.HTTPResponse.StatusCode < 300 {
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ds.resp = resp
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} else {
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ds.Downloading = false
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}
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}
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break
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}
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}
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}
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func (a *App) AddToDownloadList(path string, url string) {
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if !existsInDownloadList(a.exDir+path, url) {
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downloadList = append(downloadList, &DownloadStatus{
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resp: nil,
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Name: filepath.Base(path),
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Path: a.exDir + path,
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Url: url,
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Downloading: false,
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})
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a.ContinueDownload(url)
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} else {
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a.ContinueDownload(url)
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}
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}
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func (a *App) downloadLoop() {
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ticker := time.NewTicker(500 * time.Millisecond)
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go func() {
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for {
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<-ticker.C
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for _, ds := range downloadList {
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if ds.resp != nil {
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ds.Transferred = ds.resp.BytesComplete()
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ds.Size = ds.resp.Size()
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ds.Speed = ds.resp.BytesPerSecond()
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ds.Progress = 100 * ds.resp.Progress()
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ds.Downloading = !ds.resp.IsComplete()
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ds.Done = ds.resp.Progress() == 1
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if !ds.Downloading {
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ds.resp = nil
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}
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}
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}
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runtime.EventsEmit(a.ctx, "downloadList", downloadList)
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}
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}()
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}
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