26 lines
1.3 KiB
C#
26 lines
1.3 KiB
C#
using Kbx.Shared.ExternalData.Generated;
|
|
|
|
namespace Kbx.Shared.ExternalData;
|
|
|
|
public static class KbxExternalDataFreshnessPolicy
|
|
{
|
|
public static KbxExternalDataState Evaluate(KbxExternalDataDatasetDefinition dataset, DateTimeOffset now, DateTimeOffset? freshUntil, DateTimeOffset? usableUntil)
|
|
{
|
|
if (freshUntil is null && dataset.FreshnessMode == "provider-defined") return KbxExternalDataState.Unavailable;
|
|
if (freshUntil is not null && now <= freshUntil.Value) return KbxExternalDataState.Fresh;
|
|
if (dataset.FreshnessMode == "strict") return KbxExternalDataState.Expired;
|
|
if (usableUntil is not null && now <= usableUntil.Value) return KbxExternalDataState.Stale;
|
|
return KbxExternalDataState.Expired;
|
|
}
|
|
|
|
public static (DateTimeOffset? FreshUntil, DateTimeOffset? UsableUntil) Window(KbxExternalDataDatasetDefinition dataset, DateTimeOffset receivedAt)
|
|
{
|
|
if (dataset.FreshForSeconds is null) return (null, null);
|
|
var fresh = receivedAt.AddSeconds(dataset.FreshForSeconds.Value);
|
|
var usable = dataset.FreshnessMode == "stale-while-revalidate" && dataset.MaxStaleSeconds is > 0
|
|
? fresh.AddSeconds(dataset.MaxStaleSeconds.Value)
|
|
: fresh;
|
|
return (fresh, usable);
|
|
}
|
|
}
|