Fix health check for container deployment
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Automated Action
parent
4abac2b250
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70
app/config.py
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70
app/config.py
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@ -0,0 +1,70 @@
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import os
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from pathlib import Path
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from typing import Dict, Any
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import logging
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# Setup logging
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logging.basicConfig(level=logging.INFO)
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logger = logging.getLogger(__name__)
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# Application environment
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APP_ENV = os.getenv("APP_ENV", "development") # 'development', 'production', 'testing'
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# Database settings
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DB_CONNECT_RETRY = int(os.getenv("DB_CONNECT_RETRY", "3"))
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DB_CONNECT_RETRY_DELAY = int(os.getenv("DB_CONNECT_RETRY_DELAY", "1")) # seconds
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# Container settings
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CONTAINER_DB_PATH = os.getenv("CONTAINER_DB_PATH", "/app/storage/db")
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# Health check settings
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HEALTH_CHECK_INCLUDE_DB = (
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os.getenv("HEALTH_CHECK_INCLUDE_DB", "false").lower() == "true"
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)
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HEALTH_CHECK_PATH = os.getenv("HEALTH_CHECK_PATH", "/health")
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DETAILED_HEALTH_CHECK_PATH = os.getenv("DETAILED_HEALTH_CHECK_PATH", "/health/detailed")
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# Application settings
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DEBUG = os.getenv("DEBUG", "true").lower() == "true"
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HOST = os.getenv("HOST", "0.0.0.0")
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PORT = int(os.getenv("PORT", "8000"))
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# CORS settings
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CORS_ORIGINS = os.getenv("CORS_ORIGINS", "*").split(",")
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# API settings
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API_PREFIX = os.getenv("API_PREFIX", "")
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API_TITLE = os.getenv("API_TITLE", "Todo List API")
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API_DESCRIPTION = os.getenv(
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"API_DESCRIPTION", "A simple Todo List API built with FastAPI"
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)
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API_VERSION = os.getenv("API_VERSION", "0.1.0")
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# Get project root directory for local development
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PROJECT_ROOT = Path(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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# Log important configuration settings
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logger.info(f"Running in {APP_ENV} mode")
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logger.info(f"API will be available at {HOST}:{PORT}")
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logger.info(f"Health check path: {HEALTH_CHECK_PATH}")
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logger.info(f"Detailed health check path: {DETAILED_HEALTH_CHECK_PATH}")
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# Function to get all config as a dict (useful for debugging)
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def get_settings() -> Dict[str, Any]:
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"""Return all configuration settings as a dictionary."""
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return {
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"APP_ENV": APP_ENV,
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"DEBUG": DEBUG,
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"HOST": HOST,
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"PORT": PORT,
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"API_PREFIX": API_PREFIX,
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"API_TITLE": API_TITLE,
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"API_VERSION": API_VERSION,
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"HEALTH_CHECK_PATH": HEALTH_CHECK_PATH,
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"DETAILED_HEALTH_CHECK_PATH": DETAILED_HEALTH_CHECK_PATH,
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"HEALTH_CHECK_INCLUDE_DB": HEALTH_CHECK_INCLUDE_DB,
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"DB_CONNECT_RETRY": DB_CONNECT_RETRY,
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"DB_CONNECT_RETRY_DELAY": DB_CONNECT_RETRY_DELAY,
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"CORS_ORIGINS": CORS_ORIGINS,
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}
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@ -1,23 +1,86 @@
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from sqlalchemy import create_engine
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from sqlalchemy import create_engine, event
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from sqlalchemy.ext.declarative import declarative_base
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from sqlalchemy.orm import sessionmaker
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from pathlib import Path
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import os
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import time
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import logging
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# Get project root directory and create a storage directory
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PROJECT_ROOT = Path(
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os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
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# Import app config
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from app.config import (
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PROJECT_ROOT,
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CONTAINER_DB_PATH,
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DB_CONNECT_RETRY,
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DB_CONNECT_RETRY_DELAY,
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)
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DB_DIR = PROJECT_ROOT / "storage" / "db"
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DB_DIR.mkdir(parents=True, exist_ok=True)
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# Setup logging
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logging.basicConfig(level=logging.INFO)
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logger = logging.getLogger(__name__)
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# Get paths for database storage
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# Try container path first, then fallback to local path
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CONTAINER_DB_PATH = Path(CONTAINER_DB_PATH)
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LOCAL_DB_PATH = PROJECT_ROOT / "storage" / "db"
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# Use container path if it exists and is writable, otherwise use local path
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DB_PATH = CONTAINER_DB_PATH if CONTAINER_DB_PATH.exists() else LOCAL_DB_PATH
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DB_PATH.mkdir(parents=True, exist_ok=True)
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logger.info(f"Using database path: {DB_PATH}")
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# SQLite database URL
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SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
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SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_PATH}/db.sqlite"
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# Connection retry settings
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MAX_RETRIES = DB_CONNECT_RETRY
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RETRY_DELAY = DB_CONNECT_RETRY_DELAY # seconds
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# Create the SQLAlchemy engine with retry logic
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def get_engine():
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for attempt in range(MAX_RETRIES):
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try:
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engine = create_engine(
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SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
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)
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# Test connection
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with engine.connect() as conn:
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conn.execute("SELECT 1")
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return engine
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except Exception as e:
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if attempt < MAX_RETRIES - 1:
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logger.warning(
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f"Database connection attempt {attempt + 1} failed: {e}. Retrying in {RETRY_DELAY}s..."
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)
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time.sleep(RETRY_DELAY)
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else:
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logger.error(
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f"Failed to connect to database after {MAX_RETRIES} attempts: {e}"
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)
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# Still return the engine, we'll handle connection errors in the request handlers
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return create_engine(
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SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
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)
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# Create engine
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engine = get_engine()
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# Add event listener for connection pool "checkout" events
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@event.listens_for(engine, "connect")
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def ping_connection(dbapi_connection, connection_record):
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# Ping the connection to ensure it's valid
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try:
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cursor = dbapi_connection.cursor()
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cursor.execute("SELECT 1")
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cursor.close()
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except Exception:
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# Reconnect if the connection is invalid
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logger.warning("Connection ping failed. Connection will be recycled.")
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connection_record.connection = None
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raise
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# Create the SQLAlchemy engine
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engine = create_engine(
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SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
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)
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# Create a SessionLocal class
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SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
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@ -28,10 +91,16 @@ Base = declarative_base()
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# Create tables (important for first run)
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def create_tables():
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Base.metadata.create_all(bind=engine)
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try:
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Base.metadata.create_all(bind=engine)
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logger.info("Database tables created successfully")
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except Exception as e:
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logger.error(f"Error creating database tables: {e}")
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# Don't raise the exception - let the application start even if tables can't be created
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# Tables will be created later when the database becomes available
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# Dependency to get a database session
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# Dependency to get a database session with improved error handling
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def get_db():
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db = SessionLocal()
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try:
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@ -39,8 +108,8 @@ def get_db():
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db.execute("SELECT 1")
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yield db
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except Exception as e:
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# Log the error (in a real-world application)
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print(f"Database connection error: {e}")
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# Log the error
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logger.error(f"Database connection error in get_db: {e}")
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# Provide a user-friendly error
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from fastapi import HTTPException, status
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145
main.py
145
main.py
@ -1,15 +1,35 @@
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from fastapi import FastAPI, Depends, HTTPException, status
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from fastapi import FastAPI, Depends, HTTPException, status, Response
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from fastapi.middleware.cors import CORSMiddleware
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from sqlalchemy.orm import Session
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import uvicorn
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from typing import List, Optional
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from pydantic import BaseModel
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from datetime import datetime
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import logging
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# Import application config
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from app.config import (
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API_TITLE,
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API_DESCRIPTION,
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API_VERSION,
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CORS_ORIGINS,
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HOST,
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PORT,
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DEBUG,
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HEALTH_CHECK_PATH,
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DETAILED_HEALTH_CHECK_PATH,
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HEALTH_CHECK_INCLUDE_DB,
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get_settings,
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)
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# Import database models and config
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from app.database.config import get_db, create_tables
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from app.database.config import get_db, create_tables, SessionLocal
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from app.database.models import Todo as TodoModel
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# Setup logging
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logging.basicConfig(level=logging.INFO)
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logger = logging.getLogger(__name__)
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# Create tables if they don't exist
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# In production, you should use Alembic migrations instead
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create_tables()
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@ -37,42 +57,86 @@ class TodoResponse(TodoBase):
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# Create the FastAPI app
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app = FastAPI(
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title="Todo List API",
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description="A simple Todo List API built with FastAPI",
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version="0.1.0",
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title=API_TITLE,
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description=API_DESCRIPTION,
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version=API_VERSION,
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docs_url="/docs",
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redoc_url="/redoc",
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openapi_url="/openapi.json",
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)
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# Configure CORS
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app.add_middleware(
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CORSMiddleware,
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allow_origins=["*"],
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allow_origins=CORS_ORIGINS,
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allow_credentials=True,
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allow_methods=["*"],
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allow_headers=["*"],
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)
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# Health endpoint
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@app.get("/health", tags=["Health"])
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async def health_check(db: Session = Depends(get_db)):
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# Health endpoints
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@app.get(HEALTH_CHECK_PATH, tags=["Health"], status_code=200)
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async def health_check():
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"""
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Health check endpoint to verify the API is running and database connection is working.
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Simple health check endpoint that always returns healthy.
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This is used by container orchestration systems to verify the app is running.
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The health check will always return a 200 OK status to indicate the application
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is running, even if some components (like the database) might be unavailable.
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"""
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try:
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# Test database connection
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db.execute("SELECT 1").first()
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return {
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"status": "healthy",
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"database": "connected",
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"timestamp": datetime.now().isoformat(),
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}
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except Exception as e:
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return {
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"status": "unhealthy",
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"database": "disconnected",
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"error": str(e),
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"timestamp": datetime.now().isoformat(),
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}
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logger.info(f"Health check requested at {HEALTH_CHECK_PATH}")
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return {"status": "healthy", "timestamp": datetime.now().isoformat()}
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@app.get(DETAILED_HEALTH_CHECK_PATH, tags=["Health"])
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async def detailed_health_check(response: Response):
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"""
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Detailed health check endpoint that verifies API and database connectivity.
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This endpoint provides more detailed information about the state of various
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components of the application, including the database connection status.
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"""
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logger.info(f"Detailed health check requested at {DETAILED_HEALTH_CHECK_PATH}")
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# Start with basic info
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health_data = {
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"status": "healthy", # App is running, so it's healthy from an orchestration perspective
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"services": {
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"api": "running",
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},
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"timestamp": datetime.now().isoformat(),
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"config": {
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"db_check_enabled": HEALTH_CHECK_INCLUDE_DB,
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"environment": get_settings().get("APP_ENV"),
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},
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}
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# Check database if enabled
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if HEALTH_CHECK_INCLUDE_DB:
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db_status = "unknown"
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error_message = None
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# Create a new session for the health check
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db = SessionLocal()
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try:
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# Test database connection
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db.execute("SELECT 1").first()
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db_status = "connected"
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except Exception as e:
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db_status = "disconnected"
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error_message = str(e)
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# Don't change HTTP status code - we want health check to be 200 OK
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# to ensure container orchestration doesn't kill the app
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finally:
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db.close()
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health_data["services"]["database"] = db_status
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if error_message:
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health_data["services"]["database_error"] = error_message
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return health_data
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# Root endpoint
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@ -159,6 +223,35 @@ def delete_todo(todo_id: int, db: Session = Depends(get_db)):
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return None
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# Application startup and shutdown events
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@app.on_event("startup")
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async def startup_event():
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"""
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Function that runs when the application starts.
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"""
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logger.info("Starting Todo List API")
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logger.info(f"API Version: {API_VERSION}")
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logger.info(f"Environment: {get_settings().get('APP_ENV')}")
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logger.info(f"Debug mode: {DEBUG}")
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# Log all available routes
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routes = []
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for route in app.routes:
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routes.append(f"{route.path} [{', '.join(route.methods)}]")
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logger.info(f"Available routes: {len(routes)}")
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for route in sorted(routes):
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logger.info(f" {route}")
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@app.on_event("shutdown")
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async def shutdown_event():
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"""
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Function that runs when the application shuts down.
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"""
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logger.info("Shutting down Todo List API")
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# For local development
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if __name__ == "__main__":
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uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)
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uvicorn.run("main:app", host=HOST, port=PORT, reload=DEBUG, log_level="info")
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