protected static MultiMirrorFileDownloadSpec GetDlSpec(FileQueueSpec spec,
KeyValuePair<FileFetchInfo, ITransferStatus> file) {
var dlSpec = new MultiMirrorFileDownloadSpec(file.Key.FilePath,
spec.Location.GetChildFileWithName(file.Key.FilePath)) {
Progress = file.Value,
Verification = file.Key.OnVerify,
ExistingFile =
file.Key.ExistingPath != null ? spec.Location.GetChildFileWithName(file.Key.ExistingPath) : null
};
dlSpec.LocalFile.MakeSureParentPathExists();
return dlSpec;
}
public void Download(MultiMirrorFileDownloadSpec spec) {
spec.Start();
try {
while (true) {
var host = _mirrorStrategy.GetHost();
if (TryDownload(spec, host))
break;
ResetSpec(spec);
Thread.Sleep(MillisecondsTimeout);
}
} catch (Exception) {
spec.Fail();
throw;
}
}
public void Download(MultiMirrorFileDownloadSpec spec, CancellationToken token) {
spec.Start();
try {
while (true) {
token.ThrowIfCancellationRequested();
var host = _mirrorStrategy.GetHost();
if (TryDownload(spec, host))
break;
spec.Progress?.Reset();
Thread.Sleep(MillisecondsTimeout);
}
} catch (Exception) {
spec.Fail();
throw;
}
}
public async Task DownloadAsync(MultiMirrorFileDownloadSpec spec) {
spec.Start();
try {
while (true) {
var host = _mirrorStrategy.GetHost();
spec.UpdateHost(host);
if (await TryDownloadAsync(spec, host).ConfigureAwait(false))
break;
ResetSpec(spec);
await Task.Delay(MillisecondsTimeout).ConfigureAwait(false);
}
} catch (Exception) {
spec.Fail();
throw;
}
}
bool TryDownload(MultiMirrorFileDownloadSpec spec, Uri host) {
try {
TryDownloadFile(spec, host);
spec.End();
return true;
} catch (TransferException) {} catch (VerificationError) {}
return false;
}
private static void ResetSpec(MultiMirrorFileDownloadSpec spec)
=> spec.Progress?.Update(null, spec.Progress.Progress);
static FileDownloadSpec BuildSpec(MultiMirrorFileDownloadSpec spec, Uri host) => spec.Progress == null
? new FileDownloadSpec(spec.GetUri(host), spec.LocalFile) {
Verification = spec.Verification,
CancellationToken = spec.CancellationToken,
ExistingFile = spec.ExistingFile
}
: new FileDownloadSpec(spec.GetUri(host), spec.LocalFile, spec.Progress) {
Verification = spec.Verification,
CancellationToken = spec.CancellationToken,
ExistingFile = spec.ExistingFile
};
protected async Task TryDownloadFileAsync(MultiMirrorFileDownloadSpec spec, Uri host) {
try {
await _downloader.DownloadAsync(BuildSpec(spec, host))
.ConfigureAwait(false);
} catch (Exception ex) {
if (!(ex is IProgramError))
_mirrorStrategy.Failure(host);
else
_mirrorStrategy.ProgramFailure();
throw;
}
_mirrorStrategy.Success(host);
}
protected void TryDownloadFile(MultiMirrorFileDownloadSpec spec, Uri host) {
try {
_downloader.Download(BuildSpec(spec, host));
} catch (Exception ex) {
if (!(ex is IProgramError))
_mirrorStrategy.Failure(host);
else
_mirrorStrategy.ProgramFailure();
throw;
}
_mirrorStrategy.Success(host);
}
async Task<bool> TryDownloadAsync(MultiMirrorFileDownloadSpec spec, Uri host) {
try {
await TryDownloadFileAsync(spec, host).ConfigureAwait(false);
spec.End();
return true;
} catch (TransferException) {} catch (VerificationError) {}
return false;
}
