public async Task <SearchResultVM> Search(string query)
{
if (string.IsNullOrWhiteSpace(query))
{
throw new ArgumentNullException(nameof(query));
}
var model = new SearchResultVM {
Query = query
};
var tasks = searchEngines
.Select(se => se.SearchFirst10(query))
.ToList();
while (tasks.Count > 0)
{
var fastestTask = await Task.WhenAny(tasks);
var searchEngine = searchEngines[tasks.IndexOf(fastestTask)];
var engineName = searchEngine.Name;
if (fastestTask.IsCompletedSuccessfully)
{
var count = fastestTask.Result.Count();
if (count > 0 && count <= 10)
{
model.EngineName = engineName;
model.Items = fastestTask.Result;
model.TrademarkLink = searchEngine.TrademarkLink;
model.AddMessage(HasFoundMessage(engineName, count));
break;
}
else if (count > 10)
{
model.AddMessage(Over10EngineErrorMessage(engineName));
tasks.Remove(fastestTask);
}
else // 0
{
model.AddMessage(NotFoundMessage(engineName));
tasks.Remove(fastestTask);
}
}
else //only IsFault (cancel not implemented)
{
var message = IsFaultedMessage(engineName, fastestTask.Exception.InnerException.Message);
model.AddMessage(message);
tasks.Remove(fastestTask);
}
}
return(model);
}
public async Task <IActionResult> WebSearch(string query)
{
var model = new SearchResultVM {
Query = query
};
if (string.IsNullOrWhiteSpace(query))
{
model.Query = null;
model.AddMessage("Error: query is empty!");
}
else
{
model = await webSearchService.Search(query);
if (model.Items?.Any() == true)
{
await repository.Add(model);
}
}
return(View("Index", model));
}