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scrabble-game/CLAUDE.md
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Ilia Denisov 6aeb529f13
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feat(telegram): split connector into home validator + remote bot
Move all Telegram egress off the main host. The single connector held the
bot token, long-polled Telegram and answered the gateway/backend over the
trusted internal network, so the whole component (including login validation)
shared fate with its VPN sidecar. Split it into two binaries that share the
token:

- cmd/validator (home, no VPN): Mini App initData + Login Widget HMAC only,
  never calls the Bot API. The gateway dials it for Telegram auth, so game
  login is now independent of Telegram reachability.
- cmd/bot (remote): Bot API long-poll + sendMessage, the only component
  reaching Telegram. It holds no inbound port — it dials the gateway over a
  new reverse mTLS bot-link (pkg/proto/botlink/v1) and executes the send
  commands the gateway pushes.

The gateway funnels sends to the bot-link: out-of-app push is fire-and-forget
(at-most-once, dropped if no bot is connected); the backend admin broadcasts
reach a gateway-served relay that forwards them and awaits the bot's ack
(SendToUser/SendToGameChannel contract preserved). mTLS (pkg/mtls) is the one
inter-service link that leaves the trusted segment; validator<->gateway and
the relay stay plaintext internal. The bot is Telegram-rate-limited.

One bot now; the gateway bot registry, an owns_updates flag and per-command
ids leave seams for N later. Webhook rejected (one URL per token, adds inbound
+ a static address).

The unified test contour runs the split (the bot keeps its VPN sidecar and
dials the gateway by its internal name; bot-link certs from deploy/gen-certs.sh,
generated in CI). The prod wiring — the bot on a separate host (no VPN), the
gateway bot-link port published, PROD_ certs with scheduled rotation, an SSH
deploy of both hosts together — is the deferred final stage (PRERELEASE.md TX,
Stage 18).

Docs: ARCHITECTURE, PRERELEASE (phase TX), platform/telegram + gateway +
backend + deploy READMEs, FUNCTIONAL(+ru), CLAUDE.md, .env.example.
2026-06-21 00:19:07 +02:00

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# scrabble-game — project guide
Multiplatform Scrabble game. Read this first every session. The owner drives the
project **one stage per session** (tariff constraint), so the repository — not
conversation memory — is the source of continuity. Keep it that way.
## Sources of truth (read before changing behaviour)
- [`PLAN.md`](PLAN.md) — staged plan + **stage tracker** + per-stage *open
details to interview*.
- [`PRERELEASE.md`](PRERELEASE.md) — pre-release hardening tracker (phases R1R7
before Stage 18); same per-phase *interview + bake-back* discipline as `PLAN.md`.
- [`docs/ARCHITECTURE.md`](docs/ARCHITECTURE.md) — architecture, transport,
security, the decision record. Always describes current state.
- [`docs/FUNCTIONAL.md`](docs/FUNCTIONAL.md) (+ [`_ru`](docs/FUNCTIONAL_ru.md)
mirror) — per-domain user stories. English authoritative.
- [`docs/TESTING.md`](docs/TESTING.md) — test layers + the per-stage CI gate.
- [`docs/UI_DESIGN.md`](docs/UI_DESIGN.md) — the `ui` visual/interaction design system.
## Mandatory per-stage workflow
**Start of a stage**
1. Read `PLAN.md` (the stage's scope + *open details*) and the relevant `docs/`.
2. Analyse what the stage actually requires against the current code.
3. **Interview the owner** on every open detail and any fork not already fixed
in the plan — do not silently pick borderline decisions. Offer options with
brief pros/cons.
4. Only then implement, strictly within the stage's scope.
**End of a stage**
1. Bake every new agreement back into `PLAN.md`, `docs/ARCHITECTURE.md`,
`docs/FUNCTIONAL.md` (+ `_ru`), the affected service `README`, and Go Doc
comments — in the **same** PR. Correct earlier stages' docs/code if a new
decision changes them.
2. Update the stage tracker; add a line under *Refinements logged during
implementation* for any plan deviation.
3. Get CI green, then mark the stage done.
(The `stage-implementation` skill encodes this same loop and can be invoked.)
## Conventions
- All code, comments, identifiers, commits, docs, filenames in **English**.
- Chat with the owner follows the user-level `~/.claude/CLAUDE.md` (Russian,
the agreed persona and translation rules).
- Mirror every point edit of `docs/FUNCTIONAL.md` into `docs/FUNCTIONAL_ru.md`
in the same patch (translate only the touched paragraphs).
- Prefer compact code; do not add deps, seams or knobs until a stage needs them.
Reuse before adding. Document added packages/types/funcs with Go Doc comments.
- Update or add tests for every functional change.
## Branching & CI
- **Two long-lived branches** (Stage 16 onward): **`development`** is the
integration branch; **`master`** is the production trunk. Cut `feature/*`
branches **from `development`** and PR them back into it. (Stages 015 used
`master` as the trunk with `feature/* → master`; the genesis Stage 0 commit is
on `master` by necessity.)
- A commit to a `feature/*` branch triggers **nothing**. The single workflow
`.gitea/workflows/ci.yaml` runs the full suite (`unit` + `integration` + `ui`)
on a PR into `development` or `master`, and the gated **`deploy`** job auto-rolls
the **test contour** on a PR into — or a push to — `development`
(`docker compose up -d --build` on the runner host + a `GET /` probe). A PR into
`master` is test-only.
- Merge `development → master` only when CI is green; the **prod** deploy is then a
**manual** workflow (Stage 18), never automatic. Secrets/variables are prefixed
`TEST_` / `PROD_` per contour (Gitea 1.26 has no deployment environments).
- After any push, watch the run to green before declaring a stage done — use the
ready-made watcher, never an inline poll loop:
`python3 ~/.claude/bin/gitea-ci-watch.py` (background). It reads `$GITEA_URL`
/ `$GITEA_TOKEN`; `gitea.iliadenisov.ru` is allow-listed in
`.claude/settings.json`. Remote: `origin git@gitea.iliadenisov.ru:developer/scrabble-game.git`.
## Stack
Go 1.26.3, `go.work` monorepo, module paths `scrabble/<name>`. Dependencies are
added **when first used** (incremental): backend uses `gin` + `zap` +
`pgx`/`go-jet`/`goose`/OTel (added in Stage 1). Client↔gateway is Connect-RPC +
FlatBuffers (h2c); gateway↔backend is REST/JSON + `X-User-ID` plus a gRPC
server-stream for live events. UI is pure HTML5/CSS on plain Svelte + Vite,
packaged to native with Capacitor. Likely no Redis.
## Reused engine: `../scrabble-solver` (module `scrabble-solver`, Go 1.26.3)
Embedded **in-process as a library** — there is no per-game container. Public
API to reuse (do not reimplement):
- `scrabble.NewSolver(rs, finder)``GenerateMoves(b, r, mode)` (ranked,
highest score first), `ValidatePlay(b, dir, tiles)`, `ScorePlay(...)`;
`scrabble.Apply(b, m)`; types `Move/Word/Placement/Direction/Mode`
(`scrabble-solver/scrabble/{solver,move,apply}.go`).
- `rules.English() / RussianScrabble() / Erudit()`
(`scrabble-solver/rules/rules.go`).
- `board.New / Parse / Clone / Transpose`; `rack.New / Add / Remove / Clone`;
`selfplay.NewBag / Draw / Len` (bag pattern).
- Load committed dictionaries with `dawg.Load(path)` from
`github.com/iliadenisov/dafsa`:
`scrabble-solver/dawg/{en_sowpods,ru_scrabble,ru_erudit}.dawg`.
Constraints:
- Words/tiles are **alphabet-index bytes**, meaningful only with the matching
`rules.Ruleset` (`Alphabet.Decode`); blank flag carried separately. **Decode
to real characters before persisting history** (history must be
dictionary-independent — see `docs/ARCHITECTURE.md` §9.1).
- The solver's `internal/*` is NOT importable from this sibling module.
- **GCG is test-only** in the solver (no public writer) — we ship our own.
- Wiring: add `replace scrabble-solver => ../scrabble-solver` to `go.work` in
**Stage 2** (when `internal/engine` first imports it), and make CI check out
the solver sibling (`https://gitea.iliadenisov.ru/.../scrabble-solver.git`).
It uses published `github.com/iliadenisov/{alphabet,dafsa}` (no local replace).
## Repository layout
```
go.work # use the existing modules; grows per stage
backend/ # module scrabble/backend
cmd/backend/ # main: telemetry -> db+migrate -> cache -> server
cmd/jetgen/ # dev tool: regenerate go-jet code (throwaway container)
internal/config/ # env config (composes postgres + telemetry)
internal/telemetry/ # OTel providers + request-timing middleware
internal/postgres/ # pgx/database-sql pool, goose migrations/, jet/ (generated)
internal/account/ # durable accounts + identities (store)
internal/session/ # opaque tokens, sessions store, cache, service
internal/server/ # gin engine, /api/v1 groups, X-User-ID, probes
internal/inttest/ # //go:build integration Postgres-backed tests
docs/ .gitea/workflows/ PLAN.md CLAUDE.md README.md
gateway/ ui/ pkg/ # added by their stages
platform/telegram/ # Telegram side-service, two binaries (Stage 9; split in phase TX): cmd/validator (HMAC, no VPN) + cmd/bot (Bot API; dials gateway over reverse mTLS bot-link)
loadtest/ # module scrabble/loadtest: the pre-release stress harness (R2)
backend/Dockerfile gateway/Dockerfile platform/telegram/Dockerfile loadtest/Dockerfile # multi-stage distroless (Stage 16; loadtest R2); gateway/Dockerfile has the `landing` target (R3), platform/telegram/Dockerfile has `validator`+`bot` targets (TX)
deploy/ # docker-compose (per-service limits, R7) + caddy + landing + otelcol (OTLP + docker_stats per-container metrics) + prometheus/tempo/grafana + postgres_exporter
```
## Build & test
```sh
go build ./backend/... # per module ('./...' from the root won't span the workspace)
go vet ./backend/...
gofmt -l . # must print nothing
go test -count=1 ./backend/...
go build ./platform/telegram/... && go test ./platform/telegram/... # Telegram validator + bot (Stage 9; split in TX)
go run ./backend/cmd/backend # /healthz, /readyz on :8080
cd ui && pnpm install && pnpm check && pnpm test:unit && pnpm build # the UI (Stage 7+)
pnpm start # UI mock mode: lobby -> game, no backend
docker build -f backend/Dockerfile -t scrabble-backend . # images (Stage 16); gateway embeds the SPA
docker build -f gateway/Dockerfile --target gateway -t scrabble-gateway .
docker build -f gateway/Dockerfile --target landing -t scrabble-landing . # static landing (R3)
docker compose -f deploy/docker-compose.yml config # validate the full contour
```
The `ui` module is a Node project (pnpm), **not** in `go.work`; it is the `ui` job
of the single `.gitea/workflows/ci.yaml` (Stage 16 folded the former go-unit /
integration / ui-test workflows into it). Committed edge codegen under `ui/src/gen/`
(regenerate with `pnpm codegen`); pnpm build-script approval lives in
`ui/pnpm-workspace.yaml` (`allowBuilds: esbuild: true`).