(8) ACLs#1565
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Introduces two new crates, scoped narrowly to "1Hz ACL updates" so we can develop and experiment with the cascade and update logic without the 6-10k-line LSM avalanche described in the rfc-lsm branch. `dataplane-cascade`: head + frozen[] + tail with multi-writer head absorption via the `Upsert` trait (commutative+associative folding). Slot-published `Cascade` with `rotate` (freeze head, install new) and `compact` (fuse frozen into tail via `MergeInto`). `Snapshot` walks head -> frozen[] -> tail and stops at the first definitive answer. `Generation` newtype is in place; `lookup_at` / `compact_through` exist but aren't load-bearing yet at 1Hz update rate. `DrainEvent` / `subscribe` are behind a feature flag, off by default. `dataplane-acl`: software ACL classifier wrapping the cascade. `AclHead` is a `Mutex<BTreeMap<Priority, AclRule>>`; `AclFrozen` is a priority-sorted Vec; `AclTail` is structurally identical (room to swap a richer representation later). Compaction merges sealed layers into the tail with priority dedup. Deferred for follow-up PRs (already worked out on rfc-lsm but not shipping yet): mat facade crate, mat-runtime (PolicyGenAllocator, ManagedCascade), mat-state-sync (PeerDedup), pressure regimes / try_reset, FlowOrigin / HasOrigin, conntrack-shape cascade. See `.scratch/lsm.md` and `.scratch/mat-pipeline-rfc/0001-mat-pipeline.md` for the broader design this is a thin slice of. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Introduces two new crates, scoped narrowly to "1Hz ACL updates" so we can develop and experiment with the cascade and update logic without the 6-10k-line LSM avalanche described in the rfc-lsm branch.
dataplane-cascade: head + frozen[] + tail with multi-writer head absorption via theUpserttrait (commutative+associative folding). Slot-publishedCascadewithrotate(freeze head, install new) andcompact(fuse frozen into tail viaMergeInto).Snapshotwalks head -> frozen[] -> tail and stops at the first definitive answer.Generationnewtype is in place;lookup_at/compact_throughexist but aren't load-bearing yet at 1Hz update rate.DrainEvent/subscribeare behind a feature flag, off by default.dataplane-acl: software ACL classifier wrapping the cascade.AclHeadis aMutex<BTreeMap<Priority, AclRule>>;AclFrozenis a priority-sorted Vec;AclTailis structurally identical (room to swap a richer representation later). Compaction merges sealed layers into the tail with priority dedup.Deferred for follow-up PRs (already worked out on rfc-lsm but not shipping yet): mat facade crate, mat-runtime (PolicyGenAllocator, ManagedCascade), mat-state-sync (PeerDedup), pressure regimes / try_reset, FlowOrigin / HasOrigin, conntrack-shape cascade.
See
.scratch/lsm.mdand.scratch/mat-pipeline-rfc/0001-mat-pipeline.mdfor the broader design this is a thin slice of.