/// <summary>
/// <see cref="IHandler{T,K}.FetchContent(x,string,x,ICollection{string})"/>
/// </summary>
public override async Task FetchContent(RedditListing parsedSource, string targetFolder, RedditFilter filter, ICollection <string> outputLog)
{
await Task.Run(async() =>
{
if (parsedSource.GetCollections() != null)
{
outputLog.Add($"Starting download of {parsedSource.GetImages().Count()} images.");
foreach (var redditPost in parsedSource.GetCollections().Where(image => image != null).AsParallel())
{
if (redditPost.GetImages() == null)
{
continue;
}
var sync = new object();
foreach (var image in redditPost.GetImages().Where(image => image != null).AsParallel())
{
var imageName = Filenamer.Clean($"{redditPost.ShortTitle} - {await image.GetImageName()}");
try
{
if (filter(await image.GetHeight(), await image.GetWidth(), redditPost.Over_18, redditPost.Album != null, 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>
public override async Task FetchContent(RedditListing parsedSource, string targetFolder, RedditFilter filter, ICollection <string> outputLog, bool saveNestedCollectionsInNestedFolders = false)
{
await Task.Run(() =>
{
if (parsedSource.GetCollections() != null)
{
outputLog.Add($"Starting download of {parsedSource.GetImages().Count()} images.");
foreach (var redditPost in parsedSource.GetCollections().Where(image => image != null))
{
if (redditPost.GetImages() == null)
{
continue;
}
var sync = new object();
var localTargetFolder = targetFolder;
//If the images will be saved in their own album, then there is no reason to prefix them with the reddit-title, since the folder has that info already.
string imageNamePrefix;
if (redditPost.IsAlbum && saveNestedCollectionsInNestedFolders)
{
localTargetFolder = Path.Combine(localTargetFolder, Filenamer.Clean(redditPost.ShortTitle));
imageNamePrefix = string.Empty;
}
else
{
imageNamePrefix = Filenamer.Clean(redditPost.ShortTitle) + " - ";
}
//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(redditPost.GetImages().Where(image => image != null), parallelOptions, image =>
{
using (image)
{
var imageName = imageNamePrefix + Filenamer.Clean(image.GetImageName().Result);
try
{
if (filter(image.GetHeight().Result, image.GetWidth().Result, redditPost.Over_18,
redditPost.Album != null, image.GetAspectRatio().Result))
{
//Dont create the folder unless we actually have something to save in it.
if (!Directory.Exists(localTargetFolder))
{
Directory.CreateDirectory(localTargetFolder);
}
var path = Filenamer.DetermineUniqueFilename(Path.Combine(localTargetFolder, 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.");
});
}