mancala/apps/backend/src/index.ts

import { RTMTWS } from "./rtmt/rtmt_websocket";
import { GameManager } from "./game/GameManager";
import { GameStoreImpl } from "./game/gamestore/GameStoreImpl";
import { MatchMakerImpl } from "./matchmaker/MatchMakerImpl";
import { ExpressApp } from "./server/ExpressApp";
import { WebServer } from "./server/WebServer";
import { KeycloakTokenVerifier, readAuthConfig } from "./auth";
import { createPool, runMigrations } from "./db/postgres";
import { PostgresGameHistoryRepository } from "./history/GameHistoryRepository";
import { createValkeyClient } from "./live/valkey";
import { ValkeyLiveGameStore } from "./live/LiveGameStore";
import { GameRecorder } from "./game/GameRecorder";

const DATABASE_URL = process.env.DATABASE_URL || "postgres://mancala:mancala@localhost:5433/mancala";
const VALKEY_URL = process.env.VALKEY_URL || "redis://localhost:6379";
const MIGRATION_RETRY_MS = 30_000;
const VALKEY_STARTUP_WAIT_MS = 5_000;

async function main() {
    const authConfig = readAuthConfig();
    const tokenVerifier = new KeycloakTokenVerifier({
        issuer: authConfig.keycloakIssuer,
        jwksUrl: authConfig.keycloakJwksUrl,
        allowedClientIds: authConfig.keycloakClientIds,
    });

    const pool = createPool(DATABASE_URL);
    migrateWhenReachable(pool);
    const valkey = createValkeyClient(VALKEY_URL);
    await waitForReady(valkey, VALKEY_STARTUP_WAIT_MS);

    const liveGameStore = new ValkeyLiveGameStore(valkey);
    const recorder = new GameRecorder(new PostgresGameHistoryRepository(pool), liveGameStore);

    const rtmt = new RTMTWS({ tokenVerifier, legacyUserKeyAuth: authConfig.legacyUserKeyAuth });
    const gameStore = new GameStoreImpl();
    const matchMaker = new MatchMakerImpl({ rtmt });
    const gameManager = new GameManager({ rtmt, gameStore, matchMaker, liveGameStore, recorder });

    // Before accepting connections, so reconnecting players find their games.
    await gameManager.restoreLiveGames();
    recorder.start();
    gameManager.startTimers();

    const expressApp = new ExpressApp({ gameStore, legacyUserKeyAuth: authConfig.legacyUserKeyAuth });
    const server = new WebServer({ expressApp: expressApp.app });
    rtmt.initWebSocket(server.server);
}

// The game runs without the database; saved games wait in the recorder until migrations have run.
function migrateWhenReachable(pool: ReturnType<typeof createPool>) {
    runMigrations(pool).catch((err) => {
        console.error(`(DB) Migrations failed, retrying in ${MIGRATION_RETRY_MS / 1000}s:`, err.message);
        setTimeout(() => migrateWhenReachable(pool), MIGRATION_RETRY_MS);
    });
}

function waitForReady(client: ReturnType<typeof createValkeyClient>, timeoutMs: number): Promise<void> {
    if (client.status === "ready") return Promise.resolve();
    return new Promise((resolve) => {
        const timer = setTimeout(() => {
            console.error("(Valkey) Not reachable yet; starting without restoring live games");
            resolve();
        }, timeoutMs);
        client.once("ready", () => {
            clearTimeout(timer);
            resolve();
        });
    });
}

main().catch((err) => {
    console.error(err);
    process.exit(1);
});