Module action 

Two-table cache model: action records + content-addressed blobs.

Following Bazel’s action-cache/CAS split and Nectar’s data-computation duality:

• An action record (ActionResult) is a small JSON document keyed by the computation’s provenance (crate::cache::CacheKey: config + state + input hashes). It names the output by content hash and carries the metadata GC needs (compute cost, size, provenance, timestamps).
• A blob is the output’s bytes, stored once under its ContentHash — identical outputs from different actions deduplicate automatically.

Because the record is tiny and the blob is regenerable (re-run the action), eviction can delete blobs while keeping records: a later run recomputes the value, re-fills the same content address, and every other record pointing at it becomes servable again. Eviction degrades performance, never correctness.

Structs

ActionResult

The record of one completed computation.

ContentHash

Address of a blob: the hash of its bytes.

Enums

HashAlgo

Hash algorithm of a ContentHash, self-describing (multihash lesson from IPFS: bake the algorithm into the address so a future migration needs no flag day).

Traits

ActionCache

Store of action records (the small table).

BlobStore

Store of content-addressed blobs (the big table).