private Task <string> GetChecksumAsync(AdapterHolder adapterHolder, string key, CancellationToken cancellationToken)
{
if (key == null)
{
throw new ArgumentNullException(nameof(key));
}
return(GetChecksumAsyncImpl());
async Task <string> GetChecksumAsyncImpl()
{
var adapter = await adapterHolder.GetAdapterAsync();
await ThrowIfNotExistsAsync(adapter, key, cancellationToken);
if (adapter is IChecksumCalculator checksumCalculator)
{
return(await checksumCalculator.GetChecksumAsync(key, cancellationToken));
}
var bytes = await ReadAllBytesAsync(adapter, key, cancellationToken);
return(ChecksumHelper.FromContent(bytes));
}
}