public static bool DownloadLanguage(string language, ProgressDelegate progress, CompletionDelegate completion)
{
var localLanguages = LocalLanguages.Where(l => l.Language.Equals(language));
if (localLanguages.Count() > 0)
{
return(false);
}
var downloadableLanguages = DownloadableLanguages.Where(l => l.Language.Equals(language));
if (downloadableLanguages.Count() == 0)
{
return(false);
}
Task.Run(() =>
{
DownloadLanguageFiles(downloadableLanguages.ElementAt(0).RemotePaths, language, progress, completion);
});
return(true);
}
private static void DownloadLanguageFiles(Dictionary <string, string> urls, string language, ProgressDelegate progress, CompletionDelegate completion)
{
OcrLanguage currentlyDownloadingLanguage = null;
List <Exception> downloadErrors = new List <Exception>();
bool cancelled = false;
try
{
if (urls.Count == 0)
{
var downloadableLanguages = DownloadableLanguages.Where(l => l.Language.Equals(language));
if (downloadableLanguages.Count() > 0)
{
currentlyDownloadingLanguage = downloadableLanguages.ElementAt(0);
}
completion?.Invoke(currentlyDownloadingLanguage, null);
return;
}
currentlyDownloadingLanguage = GetCurrentlyDownloadingLanguage(urls.Values.ElementAt(0));
if (currentlyDownloadingLanguage != null)
{
if (currentlyDownloadingLanguage.CancellationTokenSource != null)
{
currentlyDownloadingLanguage.CancellationTokenSource.Dispose();
currentlyDownloadingLanguage.CancellationTokenSource = null;
}
currentlyDownloadingLanguage.CancellationTokenSource = new CancellationTokenSource();
currentlyDownloadingLanguage.IsDownloading = true;
}
long totalSizeToDownload = 0;
Task task = null;
Dictionary <string, long> totalBytesReceivedForAllDownloads = new Dictionary <string, long>();
List <Task> downloadTasks = new List <Task>();
HttpClientDownloader httpClientDownloader = new HttpClientDownloader();
httpClientDownloader.DownloadCompleted += (object sender, DownloadCompletedEventArgs e) =>
{
if (!e.Cancelled && e.Error == null)
{
string finalPath = Path.Combine(LanguagesDirectory, Path.GetFileName(e.TargetFilePath));
MoveFile(e.TargetFilePath, finalPath);
}
else if (e.Cancelled)
{
cancelled = true;
}
else if (e.Error != null)
{
downloadErrors.Add(e.Error);
}
if (cancelled || e.Error != null)
{
// Delete temporary file in case or cancellation or error.
DeleteFile(e.TargetFilePath);
}
};
httpClientDownloader.DownloadProgressChanged += (object sender, DownloadProgressChangedEventArgs e) =>
{
// if error occurred while downloading any of this language files, then abort the rest.
if (downloadErrors.Count > 0)
{
CancelDownloadForLanguage(currentlyDownloadingLanguage.Language);
return;
}
if (currentlyDownloadingLanguage != null)
{
if (!currentlyDownloadingLanguage.IsDownloading)
{
// User cancelled the download of this language
return;
}
long totalBytesReceived = 0;
lock (totalBytesReceivedForAllDownloads)
{
totalBytesReceivedForAllDownloads[e.SourceFileUrl] = e.BytesReceived;
foreach (KeyValuePair <string, long> entry in totalBytesReceivedForAllDownloads)
{
totalBytesReceived += entry.Value;
}
}
currentlyDownloadingLanguage.DownloadPercentage = Math.Round((double)totalBytesReceived / totalSizeToDownload * 100, 2);
progress?.Invoke(currentlyDownloadingLanguage, currentlyDownloadingLanguage.DownloadPercentage);
}
};
void StartDownloadTask(string url)
{
try
{
if (downloadErrors.Count > 0)
{
return;
}
string targetFilePath = Path.Combine(_downloadLanguagesDirectory, Path.GetFileName(url));
task = httpClientDownloader.DownloadFileAsync(url, targetFilePath, currentlyDownloadingLanguage.CancellationTokenSource?.Token);
downloadTasks.Add(task);
}
catch (Exception ex2)
{
Console.WriteLine(ex2.Message);
}
}
foreach (KeyValuePair <string, string> entry in urls)
{
string url = entry.Value;
string languageFile = Path.GetFileName(url);
string identifier = languageFile.Split('.')[1];
object sizeValue = Manifest[identifier][languageFile][FileSizeKeyString];
if (sizeValue.GetType() == typeof(long))
{
totalSizeToDownload += (long)sizeValue;
}
StartDownloadTask(url);
}
Task.WaitAll(downloadTasks.ToArray(), -1, (currentlyDownloadingLanguage.CancellationTokenSource != null) ? currentlyDownloadingLanguage.CancellationTokenSource.Token : CancellationToken.None);
downloadTasks.Clear();
if (!cancelled)
{
DownloadableLanguages.Remove(currentlyDownloadingLanguage);
LocalLanguages.Add(currentlyDownloadingLanguage);
//UpdateLanguagesWithCurrentManifest();
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
if (ex.GetType() != typeof(TaskCanceledException) && ex.GetType() != typeof(OperationCanceledException) && currentlyDownloadingLanguage != null)
{
downloadErrors.Add(ex);
}
}
finally
{
Exception error = null;
currentlyDownloadingLanguage.IsDownloading = false;
var errors = downloadErrors.Where(e => e != null);
if (errors != null && errors.Count() > 0)
{
error = errors.ElementAt(0);
}
if (error != null)
{
DownloadableLanguagesError = error;
currentlyDownloadingLanguage.DownloadPercentage = 0;
}
else
{
currentlyDownloadingLanguage.DownloadPercentage = 100;
}
if (!cancelled)
{
completion?.Invoke(currentlyDownloadingLanguage, error);
}
}
}