Merge pull request 'backend' (#4) from backend into main

Reviewed-on: #4

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

@@ -0,0 +1,8 @@
+- 1:
+    hostname: '172.16.57.2'
+    username: 'admin'
+    password: 'Netapp12'
+- 2:
+    hostname: '172.16.56.2'
+    username: 'admin'
+    password: 'Netapp12'

requirements.txt

@@ -1,4 +1,7 @@
 fastapi[standard]>=0.116.2
 httpx>=0.28.1
 redis>=6.4.0
-python-dotenv>=1.1.1
+python-dotenv>=1.1.1
+pydantic
+redis[hiredis]
+dotenv

src/database.py

@@ -0,0 +1,40 @@
+import json
+import logging
+from redis import Redis, ConnectionError
+from typing import List
+from pydantic import TypeAdapter
+from schema import ConfigSchema
+
+
+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)
+        if redisclient.ping():
+            log.info(f"Connected to Redis DB {redishost} on port {redisport}")
+        else:
+            log.error(f"Cannot connect to Redis DB {redishost} on port {redisport}")
+            exit(1)
+        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 get_config_from_db(redisclient: Redis) -> ConfigSchema:
+    ''' Load inventory to global vars'''
+    GLOBAL_INVENTORY = get_inventory_from_redis(redisclient)
+
+    GLOBAL_INVENTORY_VALID = TypeAdapter(List[ConfigSchema]).validate_python(GLOBAL_INVENTORY)
+
+    return GLOBAL_INVENTORY_VALID

src/example/schema.py

@@ -5,3 +5,11 @@ from pydantic import BaseModel
 class ExampleSchema(BaseModel):
     example_field: str
     another_field: int
+
+class ClusterCreds(BaseModel):
+    """A structure to hold basic auth cluster credentials for a cluster"""
+    username:      str
+    password:      str
+    hostname:      str  = None
+    cert_filepath: Path = None
+    key_filepath:  Path = None

src/initialize.py

@@ -0,0 +1,44 @@
+import os
+import json
+import logging
+import yaml
+
+from pathlib import Path
+from dotenv import load_dotenv
+from database import setup_db_conn
+from schema import ConfigSchema
+from typing import List
+from pydantic import TypeAdapter
+
+def initialize_config():
+    load_dotenv()
+    log = logging.getLogger('uvicorn')
+    ENV_INVENTORYPATH = os.getenv('cluster_inventory_path')
+    ENV_REDISHOST = os.getenv('redis_host')
+    ENV_REDISPORT = os.getenv('redis_port')
+
+    log.info(f"Found 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:
+        GLOBAL_INVENTORY_VALID = TypeAdapter(List[ConfigSchema]).validate_python(inv)
+        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

src/main.py

@@ -1,35 +1,46 @@
+import os
+import json
 import logging
+import yaml
 
-from fastapi import FastAPI
+from pathlib import Path
+from dotenv import load_dotenv
+from redis import Redis
 from contextlib import asynccontextmanager
-import httpx
 
-from src.aggregate import aggregate_router
-from src.service import load_config
+from pydantic import BaseModel, ValidationError, SecretStr, AnyHttpUrl
+from typing import Optional, Literal, List, Union
+from fastapi import FastAPI
 
-logger = logging.getLogger("uvicorn")
-
-logger.info("Starting application")
-config = load_config()
 
+from database import setup_db_conn, get_inventory_from_redis, get_config_from_db
+from src.initialize import initialize_config 
+from utils import setup_logging 
+   
 
 @asynccontextmanager
 async def lifespan(app: FastAPI):
-    app.requests_client = httpx.AsyncClient(verify=False)
+    ''' make loading it async'''
+    log = logging.getLogger('uvicorn')
+    cfg_init_result = initialize_config()
+    
+    shared_redis_conn = setup_db_conn(os.getenv('redis_host'), os.getenv('redis_port'))
+    if not shared_redis_conn:
+        log.error("Cannot connect to Redis DB. Exiting...")
+        exit(1)
+
+    inv_check = get_config_from_db(shared_redis_conn)
+    log.info(f"[DEBUG] Data validity healthcheck (DEVELOPER MODE): {inv_check}")
+    if not cfg_init_result:
+        log.error("Configuration initialization failed. Exiting...")
+        # exit(1)
+
     yield
-    await app.requests_client.aclose()
+    log.info("Shutting down FastAPI app...")
 
 
+setup_logging()
+log = logging.getLogger('uvicorn')
+
+log.info("Starting FastAPI app...")
 app = FastAPI(lifespan=lifespan)
-app.include_router(aggregate_router)
-
-
-@app.get("/")
-async def main():
-    return {"Hello": "World"}
-
-
-@app.get("/config")
-async def get_config():
-    """Endpoint to get the current configuration."""
-    return config.model_dump()

src/utils.py

@@ -1,3 +1,4 @@
+import logging
 import httpx
 
 def round_bytes(size_in_bytes: int) -> str:
@@ -22,3 +23,11 @@ async def get_data_from_ontap(client, logger, hostname: str, username: str, pass
         except httpx.HTTPError as e:
             logger.error(f"HTTP error occurred: {e}")
             return None
+
+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.")