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scrabble-game/pkg
Ilia Denisov 92f48a3b12
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Backend infers play direction; UI previews words and gates submit on legality
A single tile that only extended a word perpendicular to the client-declared
direction was rejected: the UI always sent dir=H for one-tile plays (the
dirOverride/Controls toggle was orphaned in the Stage 7 game rework), so placing
"А" above "БАК" to form "АБАК" failed the solver's main-word-length check even
though the word is in the dictionary.

Make the backend infer a play's orientation from the placed tiles and the board
(internal/engine.resolveDirection): two or more tiles by the line they share, a
lone tile by the axis it abuts (longer word wins, horizontal on a tie). Direction
becomes an output, not an input: drop dir from the SubmitPlay/Eval wire requests
and add it to EvalResult. Journal replay keeps trusting the stored "H"/"V"
(SubmitPlayDir) so a rebuilt game matches the one committed.

UI: stop computing/sending direction; the preview now shows the words a move
forms with its total score (game.previewWords); the make-move control is disabled
until the play is confirmed legal; the "your turn" label hides while tiles are
pending. Delete the orphaned Controls.svelte.

Regenerate the FlatBuffers bindings (Go + TS) and update the gateway transcode
and the loadtest edge client to the new contract. Bake the decision into
ARCHITECTURE.md (§5/§9.1), FUNCTIONAL.md (+ _ru) and the backend README.
2026-06-11 22:42:33 +02:00
..

pkg

Shared wire contracts for the Scrabble platform (module scrabble/pkg), imported by both backend and gateway. It carries no logic — only the generated message types and the schemas they come from.

Layout

proto/push/v1/    # backend -> gateway live-event gRPC channel (Push.Subscribe)
                  #   committed generated Go (*.pb.go, *_grpc.pb.go)
fbs/scrabble.fbs  # FlatBuffers edge payloads (one `scrabblefb` namespace)
fbs/scrabblefb/   # committed generated Go for the schema
  • proto/push/v1 is the single gRPC server-stream the backend exposes and the gateway subscribes to (Event{user_id, kind, payload, event_id}); the payload is an opaque FlatBuffers body the gateway forwards verbatim.
  • proto/telegram/v1 is the Telegram connector's RPC contract (including ValidateLoginWidget for the web Login Widget sign-in).
  • fbs holds the client↔gateway request/response and event payloads as FlatBuffers tables. The backend encodes the push payloads from these types; the gateway transcodes the rest to and from the backend's JSON; the UI generates TypeScript from the same .fbs.

Generated code

Committed (CI only builds it); regenerate dev-time after editing the schemas:

make -C pkg tools   # go install protoc-gen-go + protoc-gen-go-grpc
make -C pkg gen     # buf generate (proto) + flatc (fbs)

flatc is pinned to 23.5.26 to match the github.com/google/flatbuffers Go runtime in go.mod; generating with another version is refused.

Workspace wiring

scrabble/pkg is a bare-path module (no dot), so — like scrabble-solver — it cannot be fetched as a versioned dependency. go.work carries use ./pkg and replace scrabble/pkg v0.0.0 => ./pkg; consumers require scrabble/pkg v0.0.0.