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chopratejas 0414cb70e4 feat(rust): scaffold workspace + parity harness (phase-0) 
Bootstrap the Rust port of Headroom. Additive only — no existing Python
code modified. Ships the workshop, not the widgets.

Layout
  Cargo.toml (workspace) + rust-toolchain.toml
  crates/headroom-core    — transform library, stub only
  crates/headroom-proxy   — axum binary, /healthz only
  crates/headroom-py      — PyO3 cdylib, exposes headroom._core.hello()
  crates/headroom-parity  — Rust-vs-Python oracle harness + parity-run CLI

Tooling
  Makefile: test, test-parity, bench, build-proxy, build-wheel, fmt, lint
  .github/workflows/rust.yml: test, wheels (linux/mac), audit, parity-nightly
  deny.toml for cargo-deny

Parity corpus
  tests/parity/recorder.py + scripts/record_fixtures.py
  125 recorded fixtures across 5 leaf transforms (ccr, tokenizer,
  log_compressor, diff_compressor, cache_aligner)

Docs
  RUST_DEV.md — developer setup and workspace reference
  docs/spec/022-rust-migration.md — migration plan and stage breakdown

.gitignore: whitelist scripts/record_fixtures.py; ignore target/

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-04-24 13:39:48 -07:00
..
fixtures feat(scripts): add Codex proxy reconnect-storm repro harness 2026-04-20 22:02:02 +07:00
tests chore: normalize line endings in init diffs 2026-04-21 20:17:14 -05:00
changelog-gen.py fix: harden release notes and semver 2026-04-16 18:50:36 -05:00
install.ps1 feat(docker): forward HEADROOM_WORKSPACE_DIR and HEADROOM_CONFIG_DIR into containers 2026-04-16 19:19:25 -05:00
install.sh feat(docker): forward HEADROOM_WORKSPACE_DIR and HEADROOM_CONFIG_DIR into containers 2026-04-16 19:19:25 -05:00
README.md feat(scripts): add Codex proxy reconnect-storm repro harness 2026-04-20 22:02:02 +07:00
record_fixtures.py feat(rust): scaffold workspace + parity harness (phase-0) 2026-04-24 13:39:48 -07:00
repro_codex_replay.py fix: replace asyncio.timeout with 3.10-compat shim in repro harness 2026-04-20 13:41:02 -05:00
sync-plugin-versions.py build: sync agent hook manifests to repo semver 2026-04-21 20:03:14 -05:00
validate-workflows.sh ci: validate release workflows with act 2026-04-18 15:38:10 -05:00
verify-versions.py fix: support py310 version sync scripts 2026-04-21 20:42:56 -05:00
version-sync.py fix: support py310 version sync scripts 2026-04-21 20:42:56 -05:00

README.md

scripts/

Utility scripts bundled with the Headroom repo. Most are one-off operator tools; a few are runnable as part of development workflows.

Reproducing the reconnect storm

repro_codex_replay.py reproduces the multi-agent Codex reconnect/retry storm against a local Headroom proxy (default http://127.0.0.1:8787), as described in wiki/plans/2026-04-17-codex-proxy-runtime-analysis.md under "Latest Correction". Use it to:

  • Regression-check that /livez stays responsive under a cold-start storm.
  • Empirically tune the Unit 4 pre-upstream semaphore default (HEADROOM_ANTHROPIC_PRE_UPSTREAM_CONCURRENCY).
  • Exercise the Codex WS lifecycle + Anthropic HTTP path simultaneously without needing to replay captured production traffic.

Run

# Default: 8 WS + 4 HTTP clients, 30s storm, p99 /livez must stay <= 500ms.
python scripts/repro_codex_replay.py

# Tighter budget, shorter run:
python scripts/repro_codex_replay.py \
    --url http://127.0.0.1:8787 \
    --ws-clients 16 \
    --anthropic-clients 8 \
    --duration 60 \
    --livez-threshold-ms 100

# Dump the full summary as JSON for downstream tooling:
python scripts/repro_codex_replay.py --json

Exit code:

  • 0 — warmup succeeded (or was skipped), storm ran for the requested duration, and /livez p99 stayed under --livez-threshold-ms.
  • 1 — soft assertion failed, proxy unreachable, or unhandled exception. Proxy-unreachable is detected and reported within ~5 seconds.

Fixtures

The script loads two hand-crafted, fully synthetic JSON fixtures:

  • scripts/fixtures/anthropic_replay_body.json — shape of a large agent reconnect replay /v1/messages?beta=true POST body.
  • scripts/fixtures/codex_response_create_frame.json — first Codex WS frame with the {"type": "response.create", "response": {...}} envelope.

Override via --ws-frame-fixture / --anthropic-body-fixture if you have captured traffic to replay instead.

Interpretation

  • /livez p99 under threshold means the event loop is not starved during the storm. If it rises with the semaphore unbounded (HEADROOM_ANTHROPIC_PRE_UPSTREAM_CONCURRENCY=10000) and drops back under the default, Unit 4's backpressure is working.
  • Codex WS: opened should equal --ws-clients. response.completed typically stays low when upstream auth isn't configured locally — the goal is handshake + relay wiring, not real upstream traffic.
  • Anthropic HTTP: ok_2xx + non_2xx + timed_out + errors should roughly equal attempted. Sustained non-zero timed_out during the storm is the failure signal the plan targets.

A smoke test at tests/test_scripts/test_repro_codex_replay_smoke.py exercises the script against a mock FastAPI server on every PR.

Install scripts

  • install.sh — POSIX installer.
  • install.ps1 — Windows PowerShell installer.

These are generated by the release pipeline; edit with care.