private async Task GetPendingCounterData(Counter counter)
{
this.UpdateCounterWithLatestTimestamps(counter);
DateTimeOffset lastPending = DateTimeOffset.MinValue;
PendingData pendingData = counter.DataSet.GetNextPendingData(lastPending);
if (pendingData == null)
{
return;
}
do
{
if (this.disposed)
{
return;
}
lastPending = pendingData.StartTime;
// TODO: Move below method to DateTimeOffset too.
using (var aggregator =
PersistedDataProtocol.CreateAggregatorForSampleType((MetricSystem.PersistedDataType)counter.DataSet.PersistedDataType,
counter.Name,
counter.DataSet.DimensionSet,
pendingData.Sources,
new DateTime(
pendingData.StartTime.DateTime.Ticks,
DateTimeKind.Utc),
new DateTime(pendingData.EndTime.DateTime.Ticks,
DateTimeKind.Utc),
this.dataManager.MemoryStreamManager))
{
var timeout = TimeoutTiers[ServerCountTiers.Length - 1];
for (var i = 0; i < ServerCountTiers.Length; ++i)
{
if (pendingData.Sources.Count <= ServerCountTiers[i])
{
timeout = TimeoutTiers[i];
break;
}
}
aggregator.MaxFanout = MaxFanout;
aggregator.Timeout = timeout;
Events.Write.BeginRetrieveCounterData(counter.Name, pendingData.StartTime, pendingData.EndTime,
timeout, pendingData.Sources);
var success = await aggregator.Run();
if (success)
{
counter.DataSet.UpdateFromAggregator(aggregator, pendingData.StartTime, pendingData.EndTime);
}
Events.Write.EndRetrieveCounterData(counter.Name, success);
}
this.UpdateCounterWithLatestTimestamps(counter);
} while ((pendingData = counter.DataSet.GetNextPendingData(lastPending)) != null);
lock (this.activeWorkers)
{
this.activeWorkers.Remove(counter.Name);
}
}
public override async Task <Response> ProcessRequest(Request request)
{
var counterName = request.Path;
if (string.IsNullOrEmpty(counterName))
{
return(request.CreateErrorResponse(HttpStatusCode.BadRequest, "Path or command is invalid."));
}
if (request.QueryParameters.Count != 2 ||
!request.QueryParameters.ContainsKey(ReservedDimensions.StartTimeDimension) ||
!request.QueryParameters.ContainsKey(ReservedDimensions.EndTimeDimension))
{
return(request.CreateErrorResponse(HttpStatusCode.BadRequest,
"Invalid query parameters. Must specify only start and end time."));
}
DateTime start, end;
if (!DateTime.TryParse(request.QueryParameters[ReservedDimensions.StartTimeDimension], out start))
{
return(request.CreateErrorResponse(HttpStatusCode.BadRequest, "Invalid start time."));
}
if (!DateTime.TryParse(request.QueryParameters[ReservedDimensions.EndTimeDimension], out end))
{
return(request.CreateErrorResponse(HttpStatusCode.BadRequest, "Invalid end time."));
}
var message = new TransferRequest();
if (request.HasInputBody)
{
message = await request.ReadInputBody <TransferRequest>();
}
var ms = request.GetStream();
// This is a tiered aggregation request, handle it separately.
if (message.Sources != null && message.Sources.Count > 1)
{
try
{
using (var aggregator =
PersistedDataProtocol.CreateAggregatorForSampleType(message.DataType, counterName,
message.Sources, start, end,
dataManager.MemoryStreamManager))
{
if (message.Timeout > 0)
{
aggregator.Timeout = TimeSpan.FromSeconds(message.Timeout);
}
if (message.MaxFanout > 0)
{
aggregator.MaxFanout = (int)message.MaxFanout;
}
// This shouldn't happen, given that one of the servers we want to talk to is.. us.
if (!await aggregator.Run())
{
ms.Dispose();
return(request.CreateErrorResponse(HttpStatusCode.InternalServerError,
"All child requests failed."));
}
if (!aggregator.WriteToStream(ms))
{
// TODO: If we have no results but none of our queries failed we can definitively 404,
// for now lazy.
ms.Dispose();
return(request.CreateErrorResponse(HttpStatusCode.InternalServerError,
"No cntent matched."));
}
}
}
catch (ArgumentException)
{
ms.Dispose();
return(request.CreateErrorResponse(HttpStatusCode.BadRequest, "Request parameters are invalid."));
}
}
else
{
var counter = this.dataManager.GetCounter <Counter>(counterName);
if (counter == null || !counter.SerializeData(start, end, ms))
{
ms.Dispose();
return(request.CreateErrorResponse(HttpStatusCode.NotFound, "The requested data is not available."));
}
}
// after writing the response the server will handle disposing the stream for us.
return(new Response(request, HttpStatusCode.OK, ms)
{
ContentType = ResponseType
});
}
