public async Task <IEnumerable <IHackerNewsArticle> > SearchTopStoriesAsync(string searchTerm)
{
// TODO: This could be more elegant (rather than returning nothing return something meaningful)
if (searchTerm.Length > 50)
{
return(null);
}
// Sanitize input
searchTerm = HttpUtility.HtmlEncode(searchTerm);
var cacheKey = "HackerNewsServiceCaching.SearchTopStoriesAsync." + searchTerm.ToLower();
if (_memoryCache.TryGetValue <IEnumerable <IHackerNewsArticle> >(cacheKey, out var storyTask))
{
return(storyTask);
}
else
{
var response = await this.GetAllTopStoriesAsync();
if (response.Count() > 0)
{
var topStories = response.ToList();
var searchResult = topStories.Where(s => s.Title.Contains(searchTerm, StringComparison.OrdinalIgnoreCase));
return(searchResult);
}
else
{
var topSearched = await _innerHackerNewsService.SearchTopStoriesAsync(searchTerm);
_memoryCache.Set(cacheKey, topSearched, TimeSpan.FromMinutes(10));
return(topSearched);
}
}
}
