epic/OpenRA
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Fix cancellation of downloads.

Browse Source 
The Download class cancels asynchronously, which means callers must handle cancellation inside the completion event, and not after requesting cancellation.
This commit is contained in:
RoosterDragon
2016-07-30 16:27:45 +01:00
parent 77d0a8c54e
commit 3b5798b5e8
6 changed files with 61 additions and 55 deletions
Download Patch File Download Diff File Expand all files Collapse all files

60
OpenRA.Game/Download.cs
View File

@@ -17,8 +17,8 @@ namespace OpenRA
{
public class Download
{
readonly object syncObject = new object();
WebClient wc;
bool cancelled;
public static string FormatErrorMessage(Exception e)
{
@@ -28,6 +28,8 @@ namespace OpenRA
switch (ex.Status)
{
case WebExceptionStatus.RequestCanceled:
return "Cancelled";
case WebExceptionStatus.NameResolutionFailure:
return "DNS lookup failed";
case WebExceptionStatus.Timeout:
@@ -41,40 +43,42 @@ namespace OpenRA
}
}
public Download(string url, string path, Action<DownloadProgressChangedEventArgs> onProgress, Action<AsyncCompletedEventArgs, bool> onComplete)
public Download(string url, string path, Action<DownloadProgressChangedEventArgs> onProgress, Action<AsyncCompletedEventArgs> onComplete)
{
wc = new WebClient();
wc.Proxy = null;
wc.DownloadProgressChanged += (_, a) => onProgress(a);
wc.DownloadFileCompleted += (_, a) => onComplete(a, cancelled);
Game.OnQuit += Cancel;
wc.DownloadFileCompleted += (_, a) => { Game.OnQuit -= Cancel; };
wc.DownloadFileAsync(new Uri(url), path);
lock (syncObject)
{
wc = new WebClient { Proxy = null };
wc.DownloadProgressChanged += (_, a) => onProgress(a);
wc.DownloadFileCompleted += (_, a) => { DisposeWebClient(); onComplete(a); };
wc.DownloadFileAsync(new Uri(url), path);
}
}
public Download(string url, Action<DownloadProgressChangedEventArgs> onProgress, Action<DownloadDataCompletedEventArgs, bool> onComplete)
public Download(string url, Action<DownloadProgressChangedEventArgs> onProgress, Action<DownloadDataCompletedEventArgs> onComplete)
{
wc = new WebClient();
wc.Proxy = null;
wc.DownloadProgressChanged += (_, a) => onProgress(a);
wc.DownloadDataCompleted += (_, a) => onComplete(a, cancelled);
Game.OnQuit += Cancel;
wc.DownloadDataCompleted += (_, a) => { Game.OnQuit -= Cancel; };
wc.DownloadDataAsync(new Uri(url));
lock (syncObject)
{
wc = new WebClient { Proxy = null };
wc.DownloadProgressChanged += (_, a) => onProgress(a);
wc.DownloadDataCompleted += (_, a) => { DisposeWebClient(); onComplete(a); };
wc.DownloadDataAsync(new Uri(url));
}
}
public void Cancel()
void DisposeWebClient()
{
Game.OnQuit -= Cancel;
wc.CancelAsync();
wc.Dispose();
cancelled = true;
lock (syncObject)
{
wc.Dispose();
wc = null;
}
}
public void CancelAsync()
{
lock (syncObject)
if (wc != null)
wc.CancelAsync();
}
}
}