feat: add configurable cache backend (redis/memcache)

pyproject.toml

@@ -32,7 +32,7 @@ dependencies = [
     "sqlalchemy>=2.0.44",
     "apitally[fastapi]>=0.22.3",
     "auth0-fastapi-api>=1.0.0b5",
-    "fastapi-cache2[memcache]>=0.2.2",
+    "fastapi-cache2[redis,memcache]>=0.2.2",
     "slowapi>=0.1.9",
     "grpc-requests>=0.1.21",
     "gunicorn>=25.3.0",

src/quartz_api/cmd/main.py

@@ -168,7 +168,26 @@ def _create_server(conf: ConfigTree) -> FastAPI:
         },
     )
 
-    FastAPICache.init(InMemoryBackend(), expire=120, prefix="fastapi-cache")
+    match conf.get_string("cache.backend"):
+        case "redis":
+            from fastapi_cache.backends.redis import RedisBackend
+            from redis import asyncio as aioredis
+
+            redis = aioredis.from_url(conf.get_string("cache.url"))
+            FastAPICache.init(RedisBackend(redis), expire=120, prefix="fastapi-cache")
+        case "memcache":
+            from aiomcache import Client as MemcachedClient
+            from fastapi_cache.backends.memcached import MemcachedBackend
+
+            host, _, port = conf.get_string("cache.url").rpartition(":")
+            mc = MemcachedClient(host or "localhost", int(port or 11211))
+            FastAPICache.init(MemcachedBackend(mc), expire=120, prefix="fastapi-cache")
+        case _:
+            FastAPICache.init(InMemoryBackend(), expire=120, prefix="fastapi-cache")
+            log.warning(
+                "using in-memory cache. NOT recommended for production"
+                " with multiple workers",
+            )
 
     # Register rate limiter
     server.state.limiter = ratelimit.limiter

src/quartz_api/cmd/server.conf

@@ -64,6 +64,13 @@ sentry {
 cache {
   refresh_token = ""
   refresh_token = ${?CACHE_REFRESH_TOKEN}
+  // Cache backend: "inmemory", "redis", or "memcache"
+  // Use redis or memcache for production with multiple workers
+  backend = "inmemory"
+  backend = ${?CACHE_BACKEND}
+  // Connection URL for redis (redis://host:6379) or memcache (host:11211)
+  url = ""
+  url = ${?CACHE_URL}
 }
 
 // Apitally configuration