/// <summary>
/// Request for drive usage info.
/// </summary>
/// <returns></returns>
public async Task<Usage> GetUsage()
{
if (_usage == null || DateTime.UtcNow - _usage.lastCalculated > generalExpiration)
{
var metadataUrl = await amazon.GetMetadataUrl().ConfigureAwait(false);
_usage = await http.GetJsonAsync<Usage>(string.Format("{0}account/usage", metadataUrl)).ConfigureAwait(false);
}
return _usage;
}
