feat: add foreign key constraints and metrics for blockchain node

apps/pool-hub/src/poolhub/redis_cache.py

@@ -0,0 +1,39 @@
+from __future__ import annotations
+
+from collections.abc import AsyncGenerator
+
+import redis.asyncio as redis
+
+from .settings import settings
+
+_redis_client: redis.Redis | None = None
+
+
+def create_redis() -> redis.Redis:
+    global _redis_client
+    if _redis_client is None:
+        _redis_client = redis.from_url(
+            settings.redis_url,
+            max_connections=settings.redis_max_connections,
+            encoding="utf-8",
+            decode_responses=True,
+        )
+    return _redis_client
+
+
+def get_redis_client() -> redis.Redis:
+    if _redis_client is None:
+        return create_redis()
+    return _redis_client
+
+
+async def get_redis() -> AsyncGenerator[redis.Redis, None]:
+    client = get_redis_client()
+    yield client
+
+
+async def close_redis() -> None:
+    global _redis_client
+    if _redis_client is not None:
+        await _redis_client.close()
+        _redis_client = None