private async Task CheckAndInit()
{
var path = _avatarPath;
if (_cacheData == null || File.GetLastWriteTime(path) > _cacheDigest !.LastModified)
{
var data = await File.ReadAllBytesAsync(path);
_cacheDigest = new CacheableDataDigest(await _eTagGenerator.GenerateETagAsync(data), File.GetLastWriteTime(path));
Image.Identify(data, out var format);
_cacheData = new ByteData(data, format.DefaultMimeType);
}
}
public async Task <string> RetainEntryAsync(byte[] data, CancellationToken cancellationToken = default)
{
if (data == null)
{
throw new ArgumentNullException(nameof(data));
}
var tag = await _eTagGenerator.GenerateETagAsync(data, cancellationToken);
var entity = await _database.Data.Where(d => d.Tag == tag).SingleOrDefaultAsync(cancellationToken);
bool create;
if (entity == null)
{
create = true;
entity = new DataEntity
{
Tag = tag,
Data = data,
Ref = 1
};
_database.Data.Add(entity);
}
else
{
create = false;
entity.Ref += 1;
}
await _database.SaveChangesAsync(cancellationToken);
_logger.LogInformation(create ? Resource.LogDataManagerRetainEntryCreate : Resource.LogDataManagerRetainEntryAddRefCount, tag);
return(tag);
}