/// <summary>
/// Hub method. Called when client wants to fetch the content of an image message.
/// </summary>
/// <param name="username"></param>
/// <param name="messageId"></param>
/// <returns></returns>
public async Task OnPullImageContentReceived(string username, string messageId)
{
_logger.LogInformation(string.Format("OnPullImageContentReceived username: {0}; messageId: {1}", username, messageId));
string imagePayload = await _messageStorage.TryFetchImageContentAsync(messageId);
await Clients.Client(_userHandler.GetUserSession(username).ConnectionId).SendAsync("receiveImageContent", messageId, imagePayload);
}
