feat: 메인 시계를 턴 엔진 상태로 표시한다

app/game-api/src/services/turnEngineStatus.ts

@@ -0,0 +1,63 @@
+import { gatewayProfileCapabilities } from '@sammo-ts/common';
+
+import type { ProfileStatusSource } from '../auth/profileStatusSource.js';
+
+interface TurnDaemonLeaseSource {
+    turnDaemonLease: {
+        findUnique(input: {
+            where: { profile: string };
+            select: { leaseUntil: true };
+        }): Promise<{ leaseUntil: Date } | null>;
+    };
+}
+
+export const loadTurnEngineRunning = async (
+    source: ProfileStatusSource | undefined,
+    db: TurnDaemonLeaseSource,
+    profileName: string,
+    now = new Date()
+): Promise<boolean | null> => {
+    if (!source) return null;
+    try {
+        const status = await source.get(profileName);
+        if (status === null) return null;
+        if (!gatewayProfileCapabilities(status).turnsRunning) return false;
+        const lease = await db.turnDaemonLease.findUnique({
+            where: { profile: profileName },
+            select: { leaseUntil: true },
+        });
+        return lease !== null && lease.leaseUntil.getTime() > now.getTime();
+    } catch {
+        return null;
+    }
+};
+
+export class CachedTurnEngineStatus {
+    private cachedAt = Number.NEGATIVE_INFINITY;
+    private cachedValue: boolean | null = null;
+    private pending: Promise<boolean | null> | null = null;
+
+    constructor(
+        private readonly source: ProfileStatusSource,
+        private readonly db: TurnDaemonLeaseSource,
+        private readonly profileName: string,
+        private readonly cacheMs = 2_000,
+        private readonly now = () => Date.now()
+    ) {}
+
+    get(): Promise<boolean | null> {
+        if (this.now() - this.cachedAt < this.cacheMs) {
+            return Promise.resolve(this.cachedValue);
+        }
+        if (this.pending) return this.pending;
+
+        this.pending = loadTurnEngineRunning(this.source, this.db, this.profileName).then((value) => {
+            this.cachedValue = value;
+            this.cachedAt = this.now();
+            return value;
+        });
+        return this.pending.finally(() => {
+            this.pending = null;
+        });
+    }
+}