read and write with readis

Dockerfile

@@ -0,0 +1,9 @@
+FROM python:latest
+
+WORKDIR /usr/local/bin
+COPY requirements.txt requirements.txt
+RUN pip install -r requirements.txt
+
+COPY src/start.py .
+
+CMD ["src/start.py"]

config/inventory.yml

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+- 1:
+    hostname: '172.16.57.2'
+    username: 'admin'
+    password: 'Netapp12'
+- 2:
+    hostname: '172.16.56.2'
+    username: 'admin'
+    password: 'Netapp12'

src/database.py

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+import json
+import logging
+from redis import Redis, ConnectionError
+
+
+def setup_db_conn(redishost, redisport: str):
+    ''' Setup Redis connection and return it open'''
+    log = logging.getLogger('uvicorn')
+    try:
+        redisclient = Redis(host=redishost, port=redisport, decode_responses=True)
+        log.info(f"Connected to Redis DB {redishost} on port {redisport}")
+        return redisclient
+    except ConnectionError as e:
+        print(f"FATAL: Redis DB {redishost} is unreachable on port {redisport}. Err: {e}")
+        return None
+    except Exception as e:
+        print(f"FATAL: {e}")
+        return None
+
+def get_inventory_from_redis(redisclient: Redis):
+    ''' Read inventory from Redis '''
+    cluster_inv = redisclient.hgetall('cluster_inventory')
+    if 'inventory' in cluster_inv:
+        return json.loads(cluster_inv['inventory'])
+    return {}
+
+def read_config_from_db(redisclient: Redis):
+    ''' Load inventory to global vars'''
+    global_inventory = get_inventory_from_redis(redisclient)
+    return global_inventory

src/main.py

@@ -1,5 +1,71 @@
-def main() -> None:
-    print("Hello, World!")
+import os
+import json
+import logging
+import yaml
 
-if __name__ == "__main__":
-    main()
+from pathlib import Path
+from dotenv import load_dotenv
+from redis import Redis
+from contextlib import asynccontextmanager
+
+from pydantic import BaseModel, ValidationError, SecretStr, AnyHttpUrl
+from typing import Optional, Literal, List, Union
+from fastapi import FastAPI
+
+
+from database import setup_db_conn, get_inventory_from_redis, read_config_from_db
+from utils import setup_logging
+   
+
+def initialize_config():
+    load_dotenv()
+    ENV_INVENTORYPATH = os.getenv('cluster_inventory_path')
+    ENV_REDISHOST = os.getenv('redis_host')
+    ENV_REDISPORT = os.getenv('redis_port')
+
+    log.info(f"Fount Cluster Inventory file at: {ENV_INVENTORYPATH}")
+    if not ENV_INVENTORYPATH or not Path(ENV_INVENTORYPATH).is_file():
+        print(f"FATAL: Inventory file {ENV_INVENTORYPATH} is missing or not a file.")
+        return False
+    try:
+        with open(ENV_INVENTORYPATH, 'r') as f:
+            inv = yaml.safe_load(f)
+            inventory = json.dumps(inv) 
+    except Exception as e:
+        print(f"FATAL: Cannot read inventory file {ENV_INVENTORYPATH}. Err: {e}")
+        return False
+
+    print(f'[INFO] Importing configuration to DB...')
+    try:
+        redis_conn = setup_db_conn(ENV_REDISHOST, ENV_REDISPORT)
+        redis_conn.hset('cluster_inventory', mapping={'inventory': inventory})
+        redis_conn.close()
+
+        log.info("Configuration has been loaded.")
+        return True
+
+    except Exception as e: 
+        print(f"FATAL: Redis DB error: {e}")
+        return False
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    ''' make loading it async'''
+    log = logging.getLogger('uvicorn')
+    cfg_init_result = initialize_config()
+
+    inv_check = read_config_from_db(setup_db_conn(os.getenv('redis_host'), os.getenv('redis_port')))
+    log.info(f"Data validity check (DEVELOPER MODE): {inv_check}")
+    if not cfg_init_result:
+        log.error("Configuration initialization failed. Exiting...")
+        exit(1)
+
+    yield
+    log.info("Shutting down FastAPI app...")
+
+
+setup_logging()
+log = logging.getLogger('uvicorn')
+
+log.info("Starting FastAPI app...")
+app = FastAPI(lifespan=lifespan)

src/utils.py

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+import logging
+
+def setup_logging() -> None:
+    """Configure logging for the application"""
+    logging.basicConfig(
+        level=logging.DEBUG,
+        format="[%(asctime)s] [%(levelname)5s] %(message)s"
+    )
+    print(f"Logger is initialized.")