public async Task <string> ShortenAndStoreUrl(string url)
{
ShortenedUrl shortenedUrl;
do
{
shortenedUrl = new ShortenedUrl(url);
} while (!await _shortenedUrlStorage.TrySave(shortenedUrl));
return(shortenedUrl.ShortUrl);
}
public async Task <bool> TrySave(ShortenedUrl shortenedUrl)
{
try
{
await _collection.InsertOneAsync(shortenedUrl);
return(true);
}
catch (MongoWriteException e) when(e.WriteError?.Category == ServerErrorCategory.DuplicateKey)
{
return(false);
}
}
