init comment-service

services/comment-service/comment_service/redis/service.py

@@ -0,0 +1,48 @@
+from typing import Type
+
+import redis.asyncio as redis
+
+from comment_service.models.config import Config
+from comment_service.models.service import CommentRepository
+from comment_service.redis.repository import ServiceRedisRepository
+
+
+async def connect_redis(config: Config) -> redis.Redis:
+    """Opens a connection to Redis.
+    
+    Args:
+        config (Config): The app configuration.
+
+    Returns:
+        A connected redis.Redis instance
+    
+    """
+    host, port = config.redis_host, 5432
+    try:
+        host, port = config.redis_host.split(":")
+        port = int(port)
+    except Exception:
+        pass
+
+    conn = redis.Redis(host=host, port=port, password=config.redis_pass)
+    await conn.ping()
+    return conn
+
+
+async def create_redis_repository(config: Config, downstream_repo: Type[CommentRepository]) -> ServiceRedisRepository:
+    """Create the Redis repository.
+    
+    Open a Redis connection and instantialise the
+    Redis repository.
+
+    Args:
+        downstream_repo (Type[CommentRepository]): The next downstream repository
+            that will be called by the Redis repository. (in this case the database
+            repository)
+
+    Returns:
+        ServiceRedisRepository
+    
+    """
+    redis_conn = await connect_redis(config)
+    return ServiceRedisRepository(redis_conn=redis_conn, downstream_repo=downstream_repo)