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openspec/changes/enterprise-api-gateway/tasks.md
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openspec/changes/enterprise-api-gateway/tasks.md
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# Tasks: enterprise-api-gateway
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**Change ID**: enterprise-api-gateway
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**Package**: `@suaveplan/api-gateway`
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**Target path**: `api/framework/api-gateway`
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**Prerequisite packages on Verdaccio**: `@suaveplan/error`, `@suaveplan/types`, `@suaveplan/logger`, `@suaveplan/retry`, `@suaveplan/rate-limiter`, `@suaveplan/events`, `@suaveplan/api`
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---
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## 0. Pre-flight (non-negotiable)
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- [ ] 0.1 Confirm clean working tree (`git status` reports nothing) and no in-flight worktrees with uncommitted work (`git worktree list` then `git status` in each)
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- [ ] 0.2 If any worktrees exist under `.claude/worktrees/`, account for each one: still-active agent, work-pending-merge, or stale-and-prune. Stale worktrees MUST be removed (`git worktree remove`) before opening a new one — code that has been lost twice on main is the failure mode this guards against.
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- [ ] 0.3 Confirm the package set in `MANIFEST.md` matches `find packages -maxdepth 3 -name package.json` count. Drift here means a prior change archived without regenerating the manifest.
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## 1. Scaffold
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- [ ] Create `api/framework/api-gateway/` with all subdirs per layout.
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- [ ] `package.json` v0.0.0, `"sideEffects": false`, subpath exports per feature module.
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- [ ] `tsconfig.json` extending `library-node.json`.
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- [ ] `vitest.config.ts` via `createTestConfig()`.
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- [ ] Scripts: `lint`, `typecheck`, `test`, `test:coverage`, `build`, `docs:check`, `bench`.
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---
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## 2. Types, schemas, errors
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- [ ] `src/types/common.ts` — all interfaces and type aliases listed in proposal.
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- [ ] `src/types/common.md` (≥200 words, API reference, both examples).
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- [ ] `src/schemas/config.schema.ts`, `route.schema.ts`, `circuit-breaker.schema.ts` — Zod schemas; `createGateway` parses with `GatewayConfigSchema.parse(config)`.
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- [ ] `src/errors/gateway-errors.ts` — 6-code union, metadata, `registerGatewayErrorCodes()`, `GatewayError` re-export.
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- [ ] `gateway-errors.test.ts` and `gateway-errors.md`.
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---
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## 3. Router
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- [ ] `Router`: path-pattern matching (static + `:param` + wildcard `*`), method matching, ordered by specificity (static > param > wildcard).
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- [ ] `match(req)` returns first match or `null`.
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- [ ] `router.test.ts`: static match, param extraction, wildcard, method mismatch returns null, method `*` matches any.
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- [ ] `router.md`.
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---
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## 4. LoadBalancer
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- [ ] Strategies: `round-robin` (stateful counter), `random`, `weighted` (weight-proportional selection), `consistent-hash` (FNV-1a on a configurable key).
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- [ ] Skip targets with `health === 'unhealthy'`.
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- [ ] `balancer.test.ts`: each strategy, all-unhealthy throws `GatewayError(GATEWAY_NO_ROUTE)`.
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- [ ] `balancer.md`.
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---
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## 5. TransformerPipeline + helpers
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- [ ] `TransformerPipeline`: ordered list of `RequestTransformer | ResponseTransformer`; `run` applies request transformers, `runResponse` applies response transformers; catch on transformer throws `GatewayError(GATEWAY_TRANSFORM_FAILED)`.
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- [ ] Implement all six helper factories listed in proposal.
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- [ ] `transformer.test.ts`: each helper, pipeline ordering, error wrapping.
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- [ ] `transformer.md`.
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---
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## 6. GatewayCircuitBreaker
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- [ ] States: `closed` → `open` (after `failureThreshold` consecutive failures) → `half-open` (after `resetTimeout` ms) → `closed` (after `successThreshold` successes in half-open).
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- [ ] `record(success)` transitions state; emits `gateway:circuit:state` event on `@suaveplan/events` bus when state changes.
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- [ ] Injectable `Clock` for timeout tracking.
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- [ ] `circuit-breaker.test.ts`: full state machine cycle; half-open success restores, failure re-opens; open throws `GatewayError(GATEWAY_CIRCUIT_OPEN)`.
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- [ ] `circuit-breaker.md`.
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---
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## 7. HealthChecker
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- [ ] `HealthChecker` interface: `start()`, `stop()`, `getHealth(targetId): TargetHealth`.
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- [ ] Default interval-based implementation: probe via configurable `probe: (target: Target) => Promise<boolean>`; update `target.health`; emit `gateway:target:health` event on state change.
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- [ ] `health.test.ts`: probe called on interval, healthy → unhealthy transition emits event, `stop()` clears interval.
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- [ ] `health.md`.
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---
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## 8. Gateway
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- [ ] `createGateway(config)`: parse config via Zod, construct router + balancer + circuit-breaker + transformer pipeline.
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- [ ] `handle(request)`:
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1. Rate-limit check (if limiter injected) → 429 via `GatewayError`.
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2. `Router.match` → null throws `GatewayError(GATEWAY_NO_ROUTE)`.
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3. Circuit-breaker open → throws `GatewayError(GATEWAY_CIRCUIT_OPEN)`.
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4. Load-balance to target.
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5. Apply request transformers.
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6. Call `config.fetcher` with retry policy (`@suaveplan/retry`).
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7. Apply response transformers.
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8. Record circuit-breaker outcome.
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9. Return `GatewayResult`.
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- [ ] Wrap entire flow in OTel span `gateway.handle`.
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- [ ] `gateway.test.ts` (≤500 lines): happy path, no-route, circuit open, upstream timeout, retry succeeds on second attempt, transformer rewrite applied.
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- [ ] `gateway.md`.
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---
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## 9. Hono adapter
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- [ ] `gatewayMiddleware(gateway: IGateway): MiddlewareHandler` — converts Hono `Request` → `GatewayRequest`, calls `gateway.handle`, maps `GatewayResult` → Hono `Response`.
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- [ ] `hono-adapter.test.ts`: 200 forwarded, 404 no-route, circuit-open → 503.
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- [ ] `hono-adapter.md`.
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---
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## 10. Property-based tests (`tests/property.test.ts`)
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- [ ] **Router invariant**: for any route table + request, `match` returns either a consistent route or null (never throws); matched route's method contains the request method.
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- [ ] **Balancer fairness**: round-robin distributes N requests across K healthy targets with equal ±1 frequency.
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- [ ] **Circuit-breaker monotonicity**: for any sequence of boolean outcomes, the state sequence never transitions `open → closed` directly (always through `half-open`).
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- [ ] Timeout 30 000 ms on each `it()`.
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---
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## 11. Benchmarks (`src/__benchmarks__/gateway.bench.ts`)
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- [ ] `gateway_handle_passthrough`: `handle()` with 1 target, no transforms, in-process no-op fetcher.
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- [ ] `gateway_handle_5_transforms`: same but with 5 transformers.
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---
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## 12. Integration tests (`tests/integration.test.ts`)
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- [ ] Wire a real Hono upstream server; `Gateway.handle` proxies to it; assert response forwarded correctly.
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- [ ] Circuit-breaker trips after threshold; half-open probe restores.
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---
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## 13. Docs and publish
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- [ ] All co-located `.md` files (≥200 words, both examples, full API reference).
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- [ ] Root `README.md`.
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- [ ] `bunx turbo lint typecheck test --filter=@suaveplan/api-gateway` — green.
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- [ ] `bunx turbo test:coverage --filter=@suaveplan/api-gateway` — 100%.
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- [ ] `bun scripts/publish.ts --package @suaveplan/api-gateway`.
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- [ ] Archive → `openspec/archive/2026-04-24-enterprise-api-gateway/`.
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