feat: infra 패키지 추가 및 PostgreSQL, Redis 커넥터 구현

packages/infra/src/redis.ts

@@ -0,0 +1,43 @@
+import { createClient, type RedisClientOptions, type RedisClientType } from 'redis';
+
+export interface RedisConfig {
+    url: string;
+    database?: number;
+    options?: Omit<RedisClientOptions, 'url' | 'database'>;
+}
+
+export interface RedisConnector {
+    readonly client: RedisClientType;
+    connect(): Promise<void>;
+    disconnect(): Promise<void>;
+}
+
+export const resolveRedisConfigFromEnv = (
+    env: NodeJS.ProcessEnv = process.env
+): RedisConfig => {
+    const url = env.REDIS_URL ?? '';
+    if (!url) {
+        throw new Error('REDIS_URL is required to create a Redis client.');
+    }
+
+    const database = env.REDIS_DB !== undefined ? Number(env.REDIS_DB) : undefined;
+    if (database !== undefined && Number.isNaN(database)) {
+        throw new Error('REDIS_DB must be a number when provided.');
+    }
+
+    return { url, database };
+};
+
+export const createRedisConnector = (config: RedisConfig): RedisConnector => {
+    const client = createClient({
+        url: config.url,
+        database: config.database,
+        ...config.options,
+    });
+
+    return {
+        client,
+        connect: () => client.connect(),
+        disconnect: () => client.quit(),
+    };
+};