public ActionResult Counter([FromQuery] string[] name, DateTimeOffset from, DateTimeOffset to, int groupBySeconds)
{
var groupBy = TimeSpan.FromSeconds(groupBySeconds);
// must be a whole number of groupBySeconds per day.
if (!groupBy.IsDivisorOf(TimeSpan.FromDays(1)))
{
return(new JsonResult("Invalid groupBySeconds"));
}
DateTime fromUtc = from.UtcDateTime.RoundDown(groupBy);
DateTime toUtc = to.UtcDateTime.RoundUp(groupBy);
// Database must order by Name, From.
var aggregatedCounters = _database.GetAggregatedCounters(name, fromUtc, toUtc, groupBy);
var counterResponses = new List <CounterResponseModel>();
// partition by counter name
foreach (var partition in aggregatedCounters.Partition((a, b) => a.name != b.name))
{
counterResponses.Add(new CounterResponseModel {
Name = partition.First().name, From = from, GroupBySeconds = groupBySeconds, Values = new List <object>()
});
foreach (var c in partition)
{
for (var expected = fromUtc; expected < toUtc; expected = expected + groupBy)
{
counterResponses.Last().Values.Add(expected == c.from ? c.count : 0);
}
}
}
return(new JsonResult(counterResponses));
}
