Implements docs/architecture/world_persistence_impl.md §9's backend task:
chunk/room/revision Postgres schema (migration 0005), a Python port of the
world.md §3.6 binary chunk codec with golden-file tests, a WorldStore
service (world.md §5.1 minus flush_dirty/rebuild_index), the public
world-content router (rooms/chunks CRUD, optimistic concurrency, batch
writes) and the internal read-only API for dedicated servers, and
game_servers.py changes: a per-spawn bearer token, --api-url/--server-token
args, and a real "ready"-field wait replacing _await_port, which bound the
UDP port before content existed and failed open (no error) past its
deadline.
create_world now auto-creates the "main" room.
Deviations/findings, not silently decided:
- chunk_codec.py implements real IEEE-754 float32 packing rather than
mirroring a confirmed bug in scripts/chunk_data_decoder.gd's
_read_float32/_write_float32, which do a lossy int<->float cast instead
of a bit reinterpretation (verified against Godot 4.6.2 headless) and
will corrupt any non-integer position/rotation/scale/bounds value. Not
fixed here (client-side, out of scope); flagged for the client task.
- world_persistence_impl.md references a world's monotonic
content_revision (§6/§7.2/§8.1) but never defines where it's stored.
Resolved as MAX(id) over the append-only world_chunk_revisions table,
scoped to world_id, rather than adding an undocumented column.
- No existing Godot-side golden fixture/test vectors were found to reuse,
so tests/fixtures/chunks/*.bin are authored fresh from this
implementation (see generate_fixtures.py).
Verification: 132/132 backend pytest tests pass against a real ephemeral
Postgres (both reusing an already-running instance and cold via
conftest.py's own docker-compose bootstrap), including migration
upgrade/downgrade/upgrade, codec round-trip + validation-error tests, and
full HTTP round trips for PUT/GET/batch/delete/revisions/rollback and the
internal API's token auth.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Y2FESCaMXeJpC9gSctiEeD
- backend/app/services/game_servers.py: an in-process supervisor. One
headless Godot dedicated-server process per world, keyed by world_id,
spawned on demand from the join endpoint, port-allocated from a
configured range, with a background reaper that kills a world's server
once its status file reports 0 players for the idle timeout. Off by
default (GAME_SERVERS_ENABLED); the checkpoint/playtest launcher enables it.
- POST /api/worlds/{id}/join -> {world_id, host, port}; 404 for
unknown/hidden worlds, 503 when orchestration is disabled. Auth required.
- main.py lifespan starts/stops the supervisor.
- config.py: GODOT_BIN, GAME_PROJECT_DIR, GAME_SERVER_HOST, port range,
idle timeout.
- tests/test_world_join.py (auth / 404 / visibility / 503) -- suite 72 passed.
- checkpoint runner also runs the 2p multiplayer shell test.
Verified end to end: enabled orchestration, POST /join spawned the Godot
server, a real client connected to the returned address and moved; backend
shutdown reaped the process.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015jtxAiu5dAW4WxCNdGkrkJ
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