public async Task <IEnumerable <Category> > GetAllCategoriesAsync(string[] roles)
{
var categories = await GetCachedValueAsync(
() => _cache.GetCategoriesAsync(roles),
() => _repo.GetAllCategoriesAsync(roles)
);
return(categories ?? new List <Category>());
}
// TODO: support removing categories and permissions from cache
async Task UpdateCategoryCache(CancellationToken stoppingToken)
{
if (stoppingToken.IsCancellationRequested)
{
return;
}
if (await _cache.GetStatusAsync() != CacheStatus.InitializationSucceeded)
{
await _cache.SetStatusAsync(CacheStatus.Initializing);
}
var dbCategoriesAndRoles = await _repo.GetCategoriesAndRolesAsync();
var allRoles = dbCategoriesAndRoles.SelectMany(x => x.Roles).Distinct().ToArray();
var dbCategories = await _repo.GetAllCategoriesAsync(allRoles);
var cacheCategories = await _cache.GetCategoriesAsync(allRoles);
var updatedCategories = dbCategories.Except(cacheCategories.Item ?? new List <Category>());
if (updatedCategories.Count() > 0)
{
var securedCategories = updatedCategories
.Select(category => new SecuredResource <Category>(
category,
dbCategoriesAndRoles
.First(x => x.Id == category.Id)
.Roles
));
await _cache.AddCategoriesAsync(securedCategories);
_logger.LogInformation("{service} updated {count} video categories", nameof(VideoCacheProcessingService), updatedCategories.Count());
}
await UpdateVideoCache(dbCategories, dbCategoriesAndRoles, stoppingToken);
if (stoppingToken.IsCancellationRequested)
{
return;
}
await _cache.SetStatusAsync(CacheStatus.InitializationSucceeded);
}