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taodengandClaude Opus 4.7
bafa6d1991
cold-audit catch from 2026-05-23
Cold-audit Finding 17 (P2 fallback correctness). ADR 0004 § Trigger
taxonomy Hard triggers bullet 3 says "Provider CLI exit code ≠ 0
**with no usable response chunks streamed**" — the qualifier was
not honored. Pre-D16 code in `collectAllChunks` re-raised SPAWN_FAILED
unconditionally, discarding any partial chunks. Concrete failure:
provider yields 1000 chars of completion then exits non-zero (e.g.,
post-stream cleanup error) → chunks dropped, fallback to next provider,
user pays double spawn cost and loses the original provider's output.
Coordinated change across two layers, single commit per the
ADR-with-code pattern (D11 / D15 precedent):
1. docs/adr/0004-fallback-engine.md — Amendment 1 (top of doc, matching
D11/D15 placement convention):
- Documents the "usable chunks streamed" semantics precisely
- Behavior split: chunks.length > 0 + SPAWN_FAILED → synthesize stop
+ return (Case B); chunks.length === 0 + SPAWN_FAILED → re-throw
(Case A, hard trigger fires as before)
- finish_reason='length' rationale (4 reasons documented)
- Streaming-path note: ADR 0004 first-chunk rule already handles the
analogous case for D10's real-streaming branch; D16 applies to
buffered path only
- Cache behavior: write-through `getOrCompute` (preserves D4 singleflight
during truncation event) then evict via `set(ttlMs=0)` (so future
fresh callers re-spawn). `__truncated` non-enumerable marker
travels with the chunks array for follower visibility
2. server.mjs `collectAllChunks` salvage path:
- try/catch around the for-await loop
- On SPAWN_FAILED with chunks.length > 0: synthesize stop chunk
`{type:'stop', finish_reason:'length'}`, log warn event
`spawn_failed_after_usable_chunks`, mark chunks array with
non-enumerable `__truncated`, return (no re-throw)
- On SPAWN_FAILED with chunks.length === 0 OR any other error:
re-throw (preserves existing hard-trigger semantics)
3. server.mjs `executeHopFn` cache eviction:
- After `cacheStore.getOrCompute(...)` returns, check `result.__truncated`
- If truncated: `cacheStore.set(keyId, hopCacheKey, result, 0)` —
ttlMs=0 causes `_isAlive` to treat the entry as expired on next
read (verified in lib/cache/store.mjs)
4. test-features.mjs Suite 13 — 3 new tests:
- Case A regression: SPAWN_FAILED at iter 0 + 2-hop chain → openai
serves, X-OLP-Fallback-Hops: 1 (no behavior change)
- Case B 2-hop: 2 deltas + SPAWN_FAILED → anthropic serves with
synthesized stop, hops=0, finish_reason='length', content
concatenates, openai NOT called
- Case B single-hop: 1 delta + SPAWN_FAILED → HTTP 200 (not 502),
finish_reason='length', partial content visible
Tests: 297 → 300 (+3). All pass on Node 20.
Pre-commit fold-ins (per evidence-first checkpoint #4 — fold-ins
themselves need second-pass review):
- **Error-chunk-in-chunks fold-in (sonnet flagged)**: pre-D12 code
pushed error chunks BEFORE throwing. Post-D16's `chunks.length > 0`
check would incorrectly include an error chunk and trigger Case B
for a path that's actually Case A. Moved the `type === 'error'`
check BEFORE the push, restoring the invariant that the chunks
array contains only delta/stop chunks. Verified all 3 scenarios:
(1) error at iter 0 → throws before push → length=0 → Case A
(2) delta×2 + error at iter 3 → throws before push → length=2 → Case B
with delta×2 + synthesized stop (no error chunk leaks)
(3) delta + non-zero exit from outside loop → length=1 → Case B
- **ADR doc-code drift fold-in (D16 reviewer flagged)**: original
Amendment 1 text said the salvaged result "bypasses
cacheStore.getOrCompute and is returned directly, exactly as the
cache-bypass path does." This was factually wrong — the code
write-throughs via getOrCompute then evicts via ttlMs=0. The drift
was ironic: D16 was about removing doc-code drift in ADR 0004
bullet 3 itself, and the amendment was about to ship fresh drift.
Corrected to accurately describe the write-then-evict pattern and
the rationale (preserving D4 singleflight during truncation events).
Authority:
- ADR 0004 § Trigger taxonomy Hard triggers bullet 3 (the qualifier
this amendment makes load-bearing)
https://github.com/dtzp555-max/olp/blob/main/docs/adr/0004-fallback-engine.md
- ADR 0005 § Cache write conditions item 1 — "response completed
successfully (no truncation, no error mid-stream)"
- OpenAI Chat Completions finish_reason enum (stop|length|tool_calls|
content_filter|function_call|null)
https://platform.openai.com/docs/api-reference/chat/object
- ADR 0004 § Fallback safety — first-chunk rule (already governs the
analogous case in the real-streaming path)
- ALIGNMENT.md Rule 2(c) spirit — ADR amendment + code change land
in same merge (D11 / D15 precedent)
- CC 开发铁律 v1.6 § 10.x — Cold Audit caught this; diff-review
passes focused on first-chunk rule for streaming missed the
buffered path's truncation-vs-fallback decision point
Reviewer (Iron Rule v1.6 § 10.x Mode A, fresh-context opus, independent
of drafter): APPROVE_WITH_MINOR. Folded the ADR doc-code drift minor
before commit. Walked all 3 error-chunk scenarios against actual code
to verify the pre-commit fold-in is correct. Analyzed the eviction
race window (sub-ms post-inflight pre-eviction window where a fresh
caller could hit the truncated cache before eviction lands) and
concluded it's structurally bounded — one-shot leak per truncation
event; subsequent callers re-spawn. Acceptable as v0.1.
Follow-up items (reviewer's non-blocking suggestions, NOT in this PR):
- 4th test asserting second identical request triggers fresh spawn
(defense-in-depth around the eviction; store.mjs ttlMs=0 semantics
are independently established)
- `cacheStore.delete()` API (cleaner than set-with-ttlMs=0 — leaves
no dead entry in the namespace map; future PR)
- `cache_evicted_truncated` log event for dashboard observability
- SPAWN_TIMEOUT salvage parity — same architectural argument as
SPAWN_FAILED (user paid for partial content); deferred as a
separate cold-audit finding for a future D-stage
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Architecture Decision Records — OLP
This directory holds the OLP Architecture Decision Records (ADRs) — short documents that capture the why behind structural choices.
Read these before proposing governance, plug-in contract, IR, fallback, cache, or provider-inclusion changes.
Numbering
ADRs in OLP start at 0001 (the project's founding decision). OLP did not inherit the 0001 placeholder convention OCP used; the project starts on a fresh numbering line.
New ADRs increment from the highest existing number. Filenames are NNNN-<short-slug>.md.
Index
| ADR | Title | What it covers |
|---|---|---|
| 0001 | Project Founding | Why OLP exists (the 2026-06-15 Anthropic billing-split trigger), mission + non-mission boundaries, explicit supersession of OCP ADR 0005 "No Multi-Provider". |
| 0002 | Plugin Architecture for Providers | The lib/providers/<name>.mjs plug-in model, the Provider contract (name / models / auth / spawn / estimateCost / quotaStatus / healthCheck / hints), static in-tree registry, why-not full external plugin discovery. |
| 0003 | Intermediate Representation (IR) Design | The OLP-internal canonical request/response shape between the OpenAI-compat entry surface and each provider plugin. v1.0 IR fields, IR-vs-OpenAI-vs-native-provider three-shape model, IR is not exposed externally. |
| 0004 | Fallback Engine Semantics & Safety | Trigger taxonomy (Hard / Soft / Deterministic-deferred / Cost-aware-deferred), idempotent-failure safety (first-chunk rule), chain advancement one-at-a-time, observability headers. |
| 0005 | Cache Layer Cross-Provider Design | Cache key composition over (provider, model, messages, …), per-model isolation, D1+D2+D3+D4 port from OCP v3.13.0, cross-provider fallback cache behaviour (correct miss). |
| 0006 | Provider Inclusion / Exclusion + Risk-Tier Framework | The 4-tier classification (A excluded by default / B explicit consent / C opt-in / D eligible-for-default-enabled), Candidate-vs-Enabled distinction, current v0.1 candidate inventory (0 Enabled), Antigravity exclusion rationale (named prohibition + no cost advantage + reinstatement friction; pending primary-source pin), consent UX, future provider addition procedure. |
When to write a new ADR
Open one whenever:
- A structural rule is being added or changed (e.g., new IR field, new trigger type, new cache-key composition).
- A new provider plugin is being proposed (per ADR 0002 + ADR 0006 — ADR is a hard prerequisite for plugin merge).
- A decision encodes a lesson from an external event (provider policy change, drift incident).
- A future contributor reading the code alone could plausibly undo or re-litigate the choice.
Skip ADRs for routine implementation choices (algorithm pick, naming) — those belong in commit messages.
Format
Keep ADRs short — Context / Decision / Consequences / Alternatives is the standard skeleton. Cite incidents, PRs, or commits where useful. Length per ADR ~150–250 lines; longer than that, split.