/// <summary>
/// <see cref="IHandler{T,K}.FetchContent(x,string,x,ICollection{string})"/>
/// </summary>
public override async Task FetchContent(IApiCollection <IApiImage> parsedSource, string targetFolder, ImgurFilter filter, ICollection <string> outputLog)
{
await Task.Run(async() =>
{
if (parsedSource.GetImages() != null)
{
outputLog.Add($"Starting download of {parsedSource.GetImages().Count()} images.");
var sync = new object();
foreach (var image in parsedSource.GetImages().Where(image => image != null).AsParallel())
{
var imageName = Filenamer.Clean(await image.GetImageName());
try
{
if (filter(await image.GetHeight(), await image.GetWidth(), await image.GetAspectRatio()))
{
var path = Filenamer.DetermineUniqueFilename(Path.Combine(targetFolder, imageName));
var fileContents = await image.GetImage();
File.WriteAllBytes(path, fileContents);
lock (sync)
{
outputLog.Add($"Image saved: {imageName}");
image.Dispose();
}
}
else
{
lock (sync)
{
outputLog.Add($"Image skipped: {imageName}");
image.Dispose();
}
}
}
catch (WebException)
{
lock (sync)
{
outputLog.Add($"Unable to download image: {imageName}");
image.Dispose();
}
}
catch (IOException)
{
lock (sync)
{
outputLog.Add($"IO Failure - Error occured while saving image: {imageName}");
image.Dispose();
}
}
}
}
outputLog.Add("Download finished.");
});
}
/// <summary>
/// <see cref="IHandler{T,K}.FetchContent(x,string,x,ICollection{string})"/>
/// </summary>
/// <param name="saveNestedCollectionsInNestedFolders">Imgur collections
/// cannot contain nested albums, so the parameter has no effect.</param>
public override async Task FetchContent(IApiCollection <IApiImage> parsedSource, string targetFolder, ImgurFilter filter, ICollection <string> outputLog, bool saveNestedCollectionsInNestedFolders = false)
{
await Task.Run(() =>
{
if (parsedSource.GetImages() != null)
{
outputLog.Add($"Starting download of {parsedSource.GetImages().Count()} images.");
var sync = new object();
//Limit degree of parallelism to avoid sending too many http-requests at the same time.
// 8 seems like a reasonable amount of requests to have in-flight at a time.
var parallelOptions = new ParallelOptions {
MaxDegreeOfParallelism = 8
};
Parallel.ForEach(parsedSource.GetImages().Where(image => image != null), parallelOptions, image =>
{
using (image)
{
var imageName = Filenamer.Clean(image.GetImageName().Result);
try
{
if (filter(image.GetHeight().Result, image.GetWidth().Result, image.GetAspectRatio().Result))
{
var path = Filenamer.DetermineUniqueFilename(Path.Combine(targetFolder, imageName));
var fileContents = image.GetImage().Result;
File.WriteAllBytes(path, fileContents);
WriteToLog(sync, outputLog, $"Image saved: {imageName}");
}
else
{
WriteToLog(sync, outputLog, $"Image skipped: {imageName}");
}
}
catch (WebException)
{
WriteToLog(sync, outputLog, $"Unable to download image: {imageName}");
}
catch (IOException)
{
WriteToLog(sync, outputLog, $"IO Failure - Error occured while saving image: {imageName}");
}
catch (AggregateException ex)
{
if (ex.InnerException is WebException)
{
WriteToLog(sync, outputLog, $"Unable to download image: {imageName}");
}
else
{
WriteToLog(sync, outputLog, $"Unknown error occured for {imageName}. Error message is: " + ex.InnerException.Message);
}
}
}
});
}
outputLog.Add("Download finished.");
});
}
