feat(compat): make time-boxed compat code come due mechanically - #1011
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Compatibility shims meant to live for exactly one release carried their
deadline only as prose in a code comment, so nothing ever made them come
due — both of the ones this repo is carrying were found by grep rather
than by process.
Adds a `COMPAT-SINCE:` marker convention and a gate that fails the build
once a marked shim is due:
COMPAT-SINCE: 0.10.0 #1009 — what this tolerates and why it can go
The anchor is a release that has ALREADY shipped, never a guess at the
next version — a predicted "due at 0.11.0" fails silently when the next
release turns out to be 1.0.0. The gate rejects an anchor that is not in
`git tag`, so a predicted number cannot be written in the first place,
and asks only "has a release shipped since the one named?".
crates/aisix-core/tests/compat_debt.rs is the gate. It runs in the
required `rust unit + coverage` job on ordinary PRs and fails when a
stable tag with a higher MAJOR.MINOR than the anchor exists. Release
candidates never count as shipped (a candidate can be superseded, and
the runbook promotes the final tag onto the QA'd candidate's commit).
A patch on the anchor's own line does not come due, and on a
`release/X.Y` maintenance line releases past that line are out of
scope. Releases are resolved from tags only — the workspace version in
Cargo.toml is frozen and says nothing about what shipped.
A typo'd marker is a hard failure rather than silent debt, and a
tagless checkout fails rather than skipping, so the gate cannot quietly
disable itself.
Marks the two shims the repo is carrying: McpAccess::legacy_mode
(#1009) and the /passthrough/* 410 migration tombstone (#1010). Neither
is due yet — 0.10.0 is still the newest release.
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📝 WalkthroughWalkthroughThe pull request adds a ChangesCompatibility Debt Enforcement
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The PR adds automated compatibility-debt enforcement, but one marker would produce incomplete failure guidance and the CI workflow may retain credentials longer than necessary. The change is mergeable with explicit owner awareness and follow-up on these two bounded issues. Possibly related issues
Possibly related PRs
Suggested reviewers: 🚥 Pre-merge checks | ✅ 5 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (5 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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Actionable comments posted: 2
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Inline comments:
In @.github/workflows/ci.yml:
- Around line 149-154: Update the checkout action configuration near fetch-tags
to set persist-credentials to false, while preserving fetch-tags: true. Do not
alter unrelated workflow steps; any required Git write authentication must be
explicitly scoped to the step that needs it.
In `@crates/aisix-core/src/models/mcp_policy.rs`:
- Around line 118-123: Update the COMPAT-SINCE documentation marker above the
mode field so Line 118 contains a complete actionable reason after the
separator, since parse_marker_line uses only that line for Marker.reason; retain
the supplementary compatibility details in the following documentation lines.
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.github/workflows/ci.ymlCLAUDE.mdcrates/aisix-core/src/models/mcp_policy.rscrates/aisix-core/tests/compat_debt.rscrates/aisix-proxy/src/passthrough_route.rs
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A reason read only from the marker's own line quoted half a sentence in the failure report whenever the reason wrapped, which defeats the point of a report someone who has never seen the marker can act on. Lines that follow, sharing the marker's comment lead-in, are now joined onto it; the paragraph ends at a blank comment line, the next marker, the end of the comment, or a length cap. Both markers are restructured accordingly: the reason paragraph says what the shim tolerates, and the removal checklist moves to a second paragraph the report does not quote.
Compatibility shims meant to live for exactly one release carried their deadline only as prose in a code comment, so nothing ever made them come due. Both of the ones this repo is carrying right now were found by grep, not by process.
The marker
The anchor names a release that has already shipped, never a guess at the next version. "Due at 0.11.0" is a prediction that fails silently when the next release turns out to be
1.0.0; "anchored at 0.10.0" is a fact, and the question the gate asks — has a release shipped since the one named? — is answerable from the tag list. The gate rejects an anchor that is not ingit tag, so a predicted number can't be written in the first place.The gate
crates/aisix-core/tests/compat_debt.rs, running in the requiredrust unit + coveragejob so it fires on ordinary PRs, not only at release time.MAJOR.MINORthan the anchor exists. A patch on the anchor's own line (0.10.1) is the same release line, not a release since, so it doesn't come due.release/X.Ymaintenance line, releases past that line are out of scope: that line only ever ships from its own history, and pulling a shim out there would be a behaviour change in a patch release.Cargo.tomlis frozen and stamped by CI, so it says nothing about what shipped.Two properties keep the gate from quietly disabling itself: a near-miss spelling (
COMPAT_SINCE, missing colon, lowercase) is a hard failure rather than a skipped line, and a checkout with no release tags fails rather than passing — hencefetch-tags: trueon the job's checkout.The failure message names the file and line, the anchor, the reason, which release superseded it, and the two ways out: remove the code and close the tracking issue, or re-anchor to the newest release deliberately and say why in the issue. Re-anchoring is a visible, reviewable decision; letting a marker rot is not.
Markers applied
McpAccess::legacy_mode— the consumed-and-ignoredmodetombstone (Remove McpAccess::legacy_mode consumption in the first release after 0.10.0 #1009). Its surrounding prose also moves to past tense: the control plane stopped emitting the tombstone when the compat floor moved to 0.10.0./passthrough/*410 Gonemigration tombstone (Retire the /passthrough/* 410 migration tombstone in the first release after 0.10.0 #1010).Neither is due today — 0.10.0 is still the newest release, which is the point: the markers sit quiet until a release ships past them.
Tests
compat_debt.rscarries the decision logic as pure functions unit-tested against synthetic tag lists (rc handling, patch-on-the-same-line,1.0.0instead of0.11.0, maintenance-line scoping, every rejected marker spelling), plus the two live tests that scan the real tree. Verified end-to-end by planting a probe file with a due marker, a typo'd marker and an unshipped anchor, and confirming all three are reported with actionable messages.The paired control-plane half is api7/AISIX-Cloud#1356.
Marks, but does not resolve, #1009 and #1010.
Summary by CodeRabbit
Documentation
Tests & Quality
Maintenance