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M1 — World & character persistence #3

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opened 2026-07-16 23:04:47 +02:00 by marco · 1 comment

marco commented

2026-07-16 23:04:47 +02:00

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Make the world survive a server restart. Today World state is in-memory only, so a restart wipes every character's position. First step from "movement demo" to "MMO".

Scope

Persist each character's last position (and minimal world state) to the DB.
Load the saved position on login/spawn instead of a fixed start tile.
Periodic async snapshot of dirty state — never inside the tick loop (no-DB-in-tick invariant).
Flush on graceful shutdown.
Dual-provider EF migrations (SQLite + Postgres) for any new schema.

Open questions

Where does character position live: extend the Auth character store, or a GameServer-owned store? Auth and GameServer deploy separately — the choice must respect that.

Definition of Done

Base DoD applies on top (tests green, whole solution builds, zero warnings, multi-platform preserved); the criteria below are the issue-specific delta.

A character moves, disconnects, the server is restarted, reconnects, and reappears at its last position — demonstrated across two restart cycles.
The tick loop contains no persistence calls (persistence is periodic/async) — shown in code + a timing/log check.
Migrations exist for both providers and Database.Migrate() applies cleanly on SQLite and Postgres.

Make the world survive a server restart. Today `World` state is in-memory only, so a restart wipes every character's position. First step from "movement demo" to "MMO". ## Scope - [ ] Persist each character's last position (and minimal world state) to the DB. - [ ] Load the saved position on login/spawn instead of a fixed start tile. - [ ] Periodic **async** snapshot of dirty state — never inside the tick loop (no-DB-in-tick invariant). - [ ] Flush on graceful shutdown. - [ ] Dual-provider EF migrations (SQLite + Postgres) for any new schema. ## Open questions - Where does character position live: extend the Auth character store, or a GameServer-owned store? Auth and GameServer deploy separately — the choice must respect that. ## Definition of Done _Base DoD applies on top (tests green, whole solution builds, zero warnings, multi-platform preserved); the criteria below are the issue-specific delta._ - [ ] A character moves, disconnects, the **server is restarted**, reconnects, and reappears at its last position — demonstrated across two restart cycles. - [ ] The tick loop contains no persistence calls (persistence is periodic/async) — shown in code + a timing/log check. - [ ] Migrations exist for both providers and `Database.Migrate()` applies cleanly on SQLite and Postgres.

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2026-07-16 23:04:47 +02:00

marco referenced this issue

2026-07-16 23:04:49 +02:00

Roadmap: small UO-style MMO playable among friends #12

marco commented

2026-07-17 06:55:48 +02:00

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Done and merged to main (commit ffef976).

The GameServer now owns a dual-provider EF store (GameDbContext, SQLite dev / Postgres prod, both migration sets) for player positions. Position is loaded on connect, saved on disconnect and by a periodic PersistenceService (~15s) plus a shutdown flush — all off the tick loop. World.AddPlayer takes a start position; TryGetPosition exposes the current one.

Verified: an integration test (PlayerPosition_PersistsAcrossReconnect) plus a manual smoke test where a character moved, the server was restarted, and re-login placed the character back at its saved tile (not the origin). Whole solution builds zero-warning, 107 tests green, and IsoMmo.Shared (the wire contract) is untouched.

Done and merged to `main` (commit ffef976). The GameServer now owns a dual-provider EF store (`GameDbContext`, SQLite dev / Postgres prod, both migration sets) for player positions. Position is loaded on connect, saved on disconnect and by a periodic `PersistenceService` (~15s) plus a shutdown flush — all off the tick loop. `World.AddPlayer` takes a start position; `TryGetPosition` exposes the current one. Verified: an integration test (`PlayerPosition_PersistsAcrossReconnect`) plus a manual smoke test where a character moved, the server was restarted, and re-login placed the character back at its saved tile (not the origin). Whole solution builds zero-warning, 107 tests green, and `IsoMmo.Shared` (the wire contract) is untouched.

marco closed this issue

2026-07-17 06:55:48 +02:00

marco referenced this issue

2026-07-23 19:41:33 +02:00

Ranged combat: Archery (bow) — projectile, line-of-sight, ranged range #111

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