feat: 添加 NestJS API 基础设施

apps/api/src/health/health.service.ts

@@ -0,0 +1,37 @@
+import { Inject, Injectable, type OnModuleDestroy } from "@nestjs/common";
+import { createClient, type RedisClientType } from "redis";
+import { PrismaService } from "../database/prisma.service.js";
+import { DomainException } from "../common/domain.exception.js";
+import { ErrorCode } from "@drift/contracts";
+import { HttpStatus } from "@nestjs/common";
+
+@Injectable()
+export class HealthService implements OnModuleDestroy {
+  private readonly redis: RedisClientType;
+
+  constructor(@Inject(PrismaService) private readonly prisma: PrismaService) {
+    this.redis = createClient({
+      url: process.env.REDIS_URL ?? "redis://127.0.0.1:6379",
+      socket: { connectTimeout: 500, reconnectStrategy: false },
+    });
+    this.redis.on("error", () => undefined);
+  }
+
+  async check(): Promise<{ status: "ok"; postgres: "up"; redis: "up" }> {
+    try {
+      if (!this.redis.isOpen) await this.redis.connect();
+      await Promise.all([this.prisma.$queryRaw`SELECT 1`, this.redis.ping()]);
+      return { status: "ok", postgres: "up", redis: "up" };
+    } catch {
+      throw new DomainException(
+        ErrorCode.SERVICE_UNAVAILABLE,
+        "Dependencies unavailable",
+        HttpStatus.SERVICE_UNAVAILABLE,
+      );
+    }
+  }
+
+  async onModuleDestroy(): Promise<void> {
+    if (this.redis.isOpen) await this.redis.quit();
+  }
+}