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a974bb153a
Stop calling IntelligentContextManager from the Rust proxy on
/v1/messages. The proxy is now a byte-faithful passthrough on this
endpoint. Eliminates the C1+C2+C3+C4 cache-killer cluster (P0-3,
P0-4, P0-5, P1-13) by not running ICM with `frozen_message_count: 0`
hardcoded — Phase B PR-B2 brings live-zone-only compression back.
Per REALIGNMENT/03-phase-A-lockdown.md.
Changes:
- Add `--compression-mode {off,live_zone}` flag and
`HEADROOM_PROXY_COMPRESSION_MODE` env var. Default `off`. Both
modes passthrough in PR-A1; `live_zone` warns loudly because
Phase B isn't implemented yet (no silent fallback).
- Replace `compress_anthropic_request` body with a passthrough
stub that emits a structured `tracing::info!` decision log line
(request_id, path, method, compression_mode, decision,
reason="phase_a_lockdown", body_bytes) and returns
`Outcome::NoCompression`. Function signature preserved so
Phase B PR-B2 is a pure body swap.
- Delete `compression/icm.rs` (per the realignment plan: ICM
modules in headroom-core are deleted in PR-B1).
- Drop the `Arc<IntelligentContextManager>` field from `AppState`
— no longer used.
- Add request-entry `tracing::debug!` with auth_mode_placeholder
("unknown" until Phase F PR-F1 wires the auth-mode classifier).
- Add `debug_assert!` on the NoCompression branch that the
buffered bytes length is stable, locking in Phase A's
cache-safety invariant at the call site.
- Tighten existing tests from `len()` equality to SHA-256 byte
equality. Rename `compression_on_oversized_body_trims_messages`
→ `compression_on_long_body_passes_through_in_phase_a` and
flip the assertion to byte-equal.
- Add new tests: passthrough_mode_off_byte_equal_sha256,
passthrough_mode_live_zone_currently_passthrough_byte_equal_sha256,
passthrough_preserves_numeric_precision (literal-byte body so
serde_json's f64 quantization can't mask a regression),
passthrough_preserves_cache_control_markers,
passthrough_preserves_thinking_signature,
passthrough_preserves_redacted_thinking_data,
passthrough_recorded_fixture_byte_equal_sha256,
tracing_capture::compression_decision_logged.
- Add fixture
`crates/headroom-proxy/tests/fixtures/anthropic_messages_request_real.json`
with system block list + cache_control markers, tools with
nested JSON Schema, messages containing text + thinking +
signature + tool_use + tool_result + image, non-ASCII content,
large numbers. Used as the canonical SHA-256 round-trip gate.
Constraints honored: configurable (compression_mode is the only
new knob), no hardcoded thresholds, no regex usage, no silent
fallbacks (live_zone-not-implemented warns), structured tracing
on every cache-affecting decision, comprehensive tests.
Acceptance criteria from PR-A1 spec:
- `cargo build --workspace` clean
- `cargo test --workspace` green (886 tests pass)
- `cargo clippy --workspace -- -D warnings` clean
- `cargo fmt --all --check` clean
- `make ci-precheck` green
- New SHA-256 byte-equality tests pass against the recorded fixture
- `tracing::info!` decision-log line is observable
- `--compression-mode` CLI + env var work
- No regex import added
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| anthropic_messages_request_real.json | ||