internal override async Task <FileStorageCacheRecord> GetEntryAsync(StorageItemDownloadInfo item,
Stream stream, CancellationToken?cancellationToken = null)
{
var tempFileName = CreateMD5(Guid.NewGuid().ToString());
var split = tempFileName.Select((c, index) => new { c, index })
.GroupBy(x => x.index / 2)
.Select(group => group.Select(elem => elem.c))
.Select(chars => new string(chars.ToArray())).ToArray();
var dirPath = Path.Combine(split);
var directoryPath = Path.Combine(Options.CacheDirectoryPath, dirPath);
if (!Directory.Exists(directoryPath))
{
Directory.CreateDirectory(directoryPath);
}
var filePath = Path.Combine(directoryPath, Guid.NewGuid().ToString());
var fileStream = File.OpenWrite(filePath);
if (!fileStream.CanWrite)
{
throw new Exception($"Can't write to file {filePath}");
}
await stream.CopyToAsync(fileStream, cancellationToken ?? CancellationToken.None);
fileStream.Close();
return(new FileStorageCacheRecord(item.Metadata, item.FileSize, item.Date, filePath));
}
internal override async Task <InMemoryStorageCacheRecord> GetEntryAsync(StorageItemDownloadInfo item, Stream stream,
CancellationToken?cancellationToken = null)
{
using var memoryStream = new MemoryStream();
await stream.CopyToAsync(memoryStream, cancellationToken ?? CancellationToken.None);
return
(new InMemoryStorageCacheRecord(item.Metadata, item.FileSize, item.Date, memoryStream.ToArray()));
}
internal override Task <StorageItemDownloadInfo?> DoGetFileAsync(string path,
CancellationToken?cancellationToken = null)
{
StorageItemDownloadInfo?result = null;
var fullPath = Path.Combine(Options.StoragePath, path);
var fileInfo = new FileInfo(fullPath);
if (fileInfo.Exists)
{
result = new StorageItemDownloadInfo(fileInfo.Length, fileInfo.LastWriteTimeUtc,
() => new FileStream(fullPath, FileMode.Open));
}
return(Task.FromResult(result));
}
internal abstract Task <TRecord> GetEntryAsync(StorageItemDownloadInfo item, Stream stream,
CancellationToken?cancellationToken = null);
