Redis distributed cache: add HybridCache usage signal by mgravell · Pull Request #59543 · dotnet/aspnetcore (original) (raw)

We already use "DC" and "OC" markers on RESP connections to provide a non-intrusive signal that Distributed Cache and Output Cache are being used; since HybridCache is a feature on top of IDistributedCache, here we add an additional "HC" token to indicate that a RESP connection is being used for HybridCache.

We do this by using IServiceProvider (changing the internal RedisCacheImpl(...) constructors) to detect HybridCache as a service. We don't need it to be the official HybridCache specifically (as in .AddHybridCache()) - just that a HybridCache exists. There are no public API or dependency changes required.

Note: we will also want to backport this