public ValueTask <bool> Filter(BaseOriginalEvent originalEvent)
{
var propValue = _getProp(originalEvent);
var pass = _include.IsNullOrMatch(propValue) && _exclude.IsNullOrDoesntMatch(propValue);
return(new ValueTask <bool>(pass));
}
public PrepareContext(
BaseOriginalEvent originalEvent, CancellationToken cancellationToken
)
: base(cancellationToken)
{
OriginalEvent = originalEvent;
}
public void IgnoreEvent()
{
OriginalEvent = new IgnoredOriginalEvent(
OriginalEvent.Created,
OriginalEvent.EventDetails,
OriginalEvent.Position,
OriginalEvent.SequenceNumber,
OriginalEvent.TracingMetadata
);
}
public static async ValueTask <bool> CombinedFilter(
BaseOriginalEvent originalEvent, params FilterEvent[] filters
)
{
foreach (var filter in filters)
{
if (!await filter(originalEvent))
{
return(false);
}
}
return(true);
}
public async ValueTask <bool> Filter(
BaseOriginalEvent originalEvent
)
{
if (originalEvent is not OriginalEvent)
{
return(true);
}
var meta = await _cache.GetOrAddStreamMeta(
originalEvent.EventDetails.Stream,
_connection.GetStreamMeta
).ConfigureAwait(false);
var isDeleted = meta.IsDeleted && meta.DeletedAt > originalEvent.Created;
return(!isDeleted && !Truncated() && !TtlExpired() && !await OverMaxCount().ConfigureAwait(false));
bool TtlExpired()
=> meta.MaxAge.HasValue && originalEvent.Created < DateTime.Now - meta.MaxAge;
bool Truncated()
=> meta.TruncateBefore.HasValue && originalEvent.Position.EventNumber < meta.TruncateBefore;
// add the check timestamp, so we can check again if we get newer events (edge case)
async Task <bool> OverMaxCount()
{
if (!meta.MaxCount.HasValue)
{
return(false);
}
var streamSize = await _cache.GetOrAddStreamSize(
originalEvent.EventDetails.Stream,
_connection.GetStreamSize
).ConfigureAwait(false);
return(originalEvent.Position.EventNumber < streamSize.LastEventNumber - meta.MaxCount);
}
}
public ValueTask <bool> Filter(BaseOriginalEvent originalEvent) => _filter.Filter(originalEvent);
public static ValueTask <bool> EmptyFilter(BaseOriginalEvent originalEvent) => new(true);