first commit

fastapi_cache/backends/redis.py

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+from typing import Tuple
+
+from aioredis import Redis
+
+from fastapi_cache.backends import Backend
+
+
+class RedisBackend(Backend):
+    def __init__(self, redis: Redis):
+        self.redis = redis
+
+    async def get_with_ttl(self, key: str) -> Tuple[int, str]:
+        p = self.redis.pipeline()
+        p.ttl(key)
+        p.get(key)
+        return await p.execute()
+
+    async def get(self, key) -> str:
+        return await self.redis.get(key)
+
+    async def set(self, key: str, value: str, expire: int = None):
+        return await self.redis.set(key, value, expire=expire)