private ClientMessage.FilteredReadAllEventsForwardCompleted FilteredReadAllEventsForward(
ClientMessage.FilteredReadAllEventsForward msg)
{
using (HistogramService.Measure(_readerAllRangeHistogram)) {
var pos = new TFPos(msg.CommitPosition, msg.PreparePosition);
var lastCommitPosition = _readIndex.LastReplicatedPosition;
try {
if (msg.MaxCount > MaxPageSize)
{
throw new ArgumentException(string.Format("Read size too big, should be less than {0} items",
MaxPageSize));
}
if (pos == TFPos.HeadOfTf)
{
var checkpoint = _writerCheckpoint.Read();
pos = new TFPos(checkpoint, checkpoint);
}
if (pos.CommitPosition < 0 || pos.PreparePosition < 0)
{
return(NoDataForFilteredCommand(msg, FilteredReadAllResult.Error, pos, lastCommitPosition,
"Invalid position."));
}
if (msg.ValidationTfLastCommitPosition == lastCommitPosition)
{
return(NoDataForFilteredCommand(msg, FilteredReadAllResult.NotModified, pos,
lastCommitPosition));
}
var access = _readIndex.CheckStreamAccess(SystemStreams.AllStream, StreamAccessType.Read, msg.User);
if (!access.Granted)
{
return(NoDataForFilteredCommand(msg, FilteredReadAllResult.AccessDenied, pos,
lastCommitPosition));
}
var res = _readIndex.ReadAllEventsForwardFiltered(pos, msg.MaxCount, msg.MaxSearchWindow,
msg.EventFilter);
var resolved = ResolveReadAllResult(res.Records, msg.ResolveLinkTos, msg.User);
if (resolved == null)
{
return(NoDataForFilteredCommand(msg, FilteredReadAllResult.AccessDenied, pos,
lastCommitPosition));
}
var metadata = _readIndex.GetStreamMetadata(SystemStreams.AllStream);
return(new ClientMessage.FilteredReadAllEventsForwardCompleted(
msg.CorrelationId, FilteredReadAllResult.Success, null, resolved, metadata, access.Public,
msg.MaxCount,
res.CurrentPos, res.NextPos, res.PrevPos, lastCommitPosition, res.IsEndOfStream));
} catch (Exception exc) {
Log.ErrorException(exc, "Error during processing ReadAllEventsForwardFiltered request.");
return(NoDataForFilteredCommand(msg, FilteredReadAllResult.Error, pos, lastCommitPosition,
exc.Message));
}
}
}
public IndexReadAllResult ReadAllEventsForwardFiltered(TFPos pos, int maxCount, int maxSearchWindow, IEventFilter eventFilter) => _readIndex.ReadAllEventsForwardFiltered(pos, maxCount, maxSearchWindow, eventFilter);