mirror of
https://github.com/rustfs/rustfs.git
synced 2026-07-26 16:28:15 +00:00
houseme
e742a540a4
`full_object_plaintext_len` decides whether a body-cache hook hit may serve bytes in place of the erasure read. It is a fail-closed allow-list: it excludes every read whose `ReadPlan::build` applies some other transform (ranged/part, raw/data-movement, restore, encrypted, remote) with an early `return None`, then returns a `Some(..)` length only for the whole-plaintext cases. A newly added `ReadPlan` branch that nobody teaches this gate about falls through to `None` and safely bypasses the cache. Flip it to a deny-list and the same new branch silently serves bytes in the wrong representation — the backlog#1108 / #1109 / #1146 class of bug. The existing unit and e2e tests only cover the branches that exist today. This adds `scripts/check_body_cache_whitelist.sh`, a structural guard wired into pre-commit / pre-pr / dev-check and CI, that asserts every exclusion predicate and a `return None` still precede the first `Some(..)`. Reordering a predicate, dropping one, moving the positive return ahead of the gate, or renaming/removing the function all fail; wording, formatting, and adding a new exclusion in the same gate do not. Mutation-tested against all four regression shapes. This machine-enforces the structural invariant that backlog#1146 was kept open to guard by hand. Co-authored-by: heihutu <heihutu@gmail.com>