public async Task <IActionResult> GetRelatedArticleAsync([FromQuery] string address)
{
Logger.Info("Incoming GET request for related article method with address '{0}'", address ?? "");
// validate the address retrieved from URL query string
if (string.IsNullOrWhiteSpace(address))
{
Logger.Info("Address retrieved from URL query string is null or empty, so 400 Bad Request will be returned.");
return(BadRequest("Article address must not be empty."));
}
try
{
// check whether article already exists in Elasticsearch
var articleAlreadyExistsData = await articleClient.TryGetArticleId(address);
if (!articleAlreadyExistsData.ArticleExists)
{
// article doesn't exist in Elasticsearch yet, so return 404 Not Found
Logger.Info("Article doesn't exist in Elasticsearch yet, so 404 Not Found will be returned.");
return(NotFound("Article doesn't exist in Elasticsearch yet."));
}
// article already exists, get its ID from client response
string articleId = articleAlreadyExistsData.ArticleId;
// get related article from Elasticsearch based on article ID
var relatedArticleData = await articleClient.TryGetRelatedArticleAddress(articleId);
if (!relatedArticleData.RelatedArticleExists)
{
// there is no related article found, so return 404 Not Found
Logger.Info("There is no related article found in Elasticsearch, so 404 Not Found will be returned.");
return(NotFound("There is no related article in Elasticsearch."));
}
// related article successfully found, return its address in the 200 OK response
Logger.Info("Related article successfully found, so 200 OK will be returned with related article's address.");
return(Ok(relatedArticleData.RelatedArticleAddress));
}
catch (Exception ex)
{
Logger.Error(ex, "Error happened while processing incoming request:");
// return 500 Internal Server Error without exposing details of the error
return(StatusCode(StatusCodes.Status500InternalServerError, "Internal server error happened while processing the request."));
}
}
