This repository has been archived by the owner on Jun 3, 2022. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 1
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
fix: use custom simple downloader, fixes various quirks
Allows the remote file Content-Length to mismatch the local file's size, which will trigger a re-download. Displays progress in real-time.
- Loading branch information
Showing
9 changed files
with
141 additions
and
135 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| package downloader | ||
|
|
||
| import ( | ||
| "context" | ||
| "cornstone/throttler" | ||
| "cornstone/util" | ||
| "github.com/ViRb3/sling/v2" | ||
| "io" | ||
| "net/http" | ||
| "os" | ||
| "strconv" | ||
| ) | ||
|
|
||
| type Request struct { | ||
| DownloadPath string | ||
| DownloadUrl string | ||
| Tag interface{} | ||
| } | ||
|
|
||
| type Result struct { | ||
| Response *http.Response | ||
| Request Request | ||
| Err error | ||
| } | ||
|
|
||
| type MultiDownloader struct { | ||
| requests []Request | ||
| workers int | ||
| client *sling.Sling | ||
| skipExisting bool | ||
| } | ||
|
|
||
| func NewMultiDownloader(workers int, requests ...Request) *MultiDownloader { | ||
| downloader := MultiDownloader{ | ||
| requests: requests, | ||
| workers: workers, | ||
| client: util.DefaultClient.New(), | ||
| } | ||
| return &downloader | ||
| } | ||
|
|
||
| func (s *MultiDownloader) Do() (<-chan Result, context.CancelFunc) { | ||
| ctx, cancelFunc := context.WithCancel(context.Background()) | ||
| var source []interface{} | ||
| for i := range s.requests { | ||
| source = append(source, s.requests[i]) | ||
| } | ||
|
|
||
| downloadThrottler := throttler.NewThrottler(throttler.Config{ | ||
| Ctx: ctx, | ||
| ResultBuffer: 0, | ||
| Workers: s.workers, | ||
| Source: source, | ||
| Operation: func(sourceItem interface{}) (interface{}, error) { | ||
| request := sourceItem.(Request) | ||
|
|
||
| resp, err := s.client.New().Head(request.DownloadUrl).Receive(nil, nil) | ||
| if err != nil { | ||
| return Result{Err: err}, nil | ||
| } | ||
| if contentLen := resp.Header.Get("Content-Length"); contentLen != "" { | ||
| contentLenInt, err := strconv.ParseInt(contentLen, 10, 64) | ||
| if err == nil { | ||
| if stat, err := os.Stat(request.DownloadPath); err == nil && stat.Size() == contentLenInt { | ||
| return Result{nil, request, nil}, nil | ||
| } | ||
| } | ||
| } | ||
| resp, err = s.client.New().Get(request.DownloadUrl).ReceiveBody() | ||
| if err != nil { | ||
| return Result{Err: err}, nil | ||
| } | ||
| defer resp.Body.Close() | ||
| file, err := os.Create(request.DownloadPath) | ||
| if err != nil { | ||
| return Result{Err: err}, nil | ||
| } | ||
| defer file.Close() | ||
| if _, err := io.Copy(file, resp.Body); err != nil { | ||
| os.Remove(file.Name()) | ||
| return Result{Err: err}, nil | ||
| } | ||
| return Result{resp, request, nil}, nil | ||
| }, | ||
| }) | ||
|
|
||
| returnResult := make(chan Result, 10) | ||
| go s.handleMultiFile(returnResult, downloadThrottler) | ||
| return returnResult, cancelFunc | ||
| } | ||
|
|
||
| func (s *MultiDownloader) handleMultiFile(returnResult chan Result, downloadThrottler *throttler.Throttler) { | ||
| defer close(returnResult) | ||
| bar := util.NewBar(len(s.requests)) | ||
| defer bar.Finish() | ||
| for response := range downloadThrottler.Run() { | ||
| returnResult <- response.Data.(Result) | ||
| bar.Add(1) | ||
| } | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.