private string SerializeContinuationQuery(LeaderboardContinuationQuery query)
{
var json = Newtonsoft.Json.JsonConvert.SerializeObject(query);
return(System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(json)));
}
public async Task <LeaderboardResult <ScoreRecord> > Query(LeaderboardQuery rq)
{
var isContinuation = rq is LeaderboardContinuationQuery;
var client = await CreateClient(rq);
ScoreRecord start = null;
if (!string.IsNullOrEmpty(rq.StartId))
{
start = await GetScore(rq.StartId, rq.Name);
if (start == null)
{
throw new ClientException("Admiral not found in leadeboard.");
}
}
var result = await client.SearchAsync <ScoreRecord>(s =>
{
s = s.AllowNoIndices();
s = s.Query(query => CreateQuery(query, rq, q =>
{
if (start != null)//If we have a pivot we must add constraint to start the result around it.
{
//Create next/previous additional constraints
if ((rq as LeaderboardContinuationQuery)?.IsPrevious == true)
{
return(CreatePreviousPaginationFilter(q, start));
}
else
{
return(CreateNextPaginationFilter(q, start));
}
}
else
{
return(q);
}
})).AllowNoIndices();
if ((rq as LeaderboardContinuationQuery)?.IsPrevious == true)
{
s = s.Sort(sort => sort.Ascending(record => record.Score).Descending(record => record.CreatedOn));
}
else
{
s = s.Sort(sort => sort.Descending(record => record.Score).Ascending(record => record.CreatedOn));
}
if ((isContinuation && (rq as LeaderboardContinuationQuery)?.IsPrevious == false) || start == null)
{
s = s.Size(rq.Count + 1).From(rq.Skip);// We get one more document than necessary to be able to determine if we can build a "next" continuation
}
else// The pivot is not included in the result set, if we are not running a continuation query, we must prefix the results with the pivot.
{
s = s.Size(rq.Count).From(rq.Skip);
}
return(s);
});
if (!result.IsValid)
{
if (result.ServerError.Status == 404)
{
return(new LeaderboardResult <ScoreRecord> {
Results = new List <LeaderboardRanking <ScoreRecord> >()
});
}
_logger.Log(LogLevel.Error, "leaderboard", "failed to process query request.", result.ServerError);
throw new InvalidOperationException($"Failed to query leaderboard : {result.ServerError.Error.Reason}");
}
var documents = result.Documents.ToList();
if (!isContinuation && start != null)
{
documents.Insert(0, start);
}
else if ((rq as LeaderboardContinuationQuery)?.IsPrevious == true)
{
documents.Reverse();
}
//Compute rankings
if (documents.Any())
{
int firstRank = 0;
try
{
firstRank = (int) await GetRanking(documents.First(), rq, rq.Name);
}
catch (InvalidOperationException ex)
{
_logger.Log(LogLevel.Error, "leaderboard", ex.Message, ex);
throw new InvalidOperationException($"Failed to query leaderboard : {ex.Message}");
}
var rank = firstRank;
var lastScore = int.MaxValue;
var lastRank = firstRank;
var results = new List <LeaderboardRanking <ScoreRecord> >();
foreach (var doc in documents.Take(rq.Count))
{
if (EnableExequo)
{
int currentRank;
if (doc.Score == lastScore)
{
currentRank = lastRank;
}
else
{
currentRank = rank;
}
results.Add(new LeaderboardRanking <ScoreRecord> {
Document = doc, Ranking = currentRank
});
lastRank = currentRank;
}
else
{
results.Add(new LeaderboardRanking <ScoreRecord> {
Document = doc, Ranking = rank
});
}
rank++;
}
var leaderboardResult = new LeaderboardResult <ScoreRecord> {
Results = results
};
if (firstRank > 1)//There are scores before the first in the list
{
var previousQuery = new LeaderboardContinuationQuery(rq);
previousQuery.Skip = 0;
previousQuery.Count = rq.Count;
previousQuery.IsPrevious = true;
previousQuery.StartId = results.First().Document.Id;
leaderboardResult.Previous = SerializeContinuationQuery(previousQuery);
}
if (documents.Count > rq.Count || (rq as LeaderboardContinuationQuery)?.IsPrevious == true)//there are scores after the last in the list.
{
var nextQuery = new LeaderboardContinuationQuery(rq);
nextQuery.Skip = 0;
nextQuery.Count = rq.Count;
nextQuery.IsPrevious = false;
nextQuery.StartId = results.Last().Document.Id;
leaderboardResult.Next = SerializeContinuationQuery(nextQuery);
}
return(leaderboardResult);
}
else
{
return(new LeaderboardResult <ScoreRecord>());
}
}
