litellm/proxy/queue/celery_app.py

from dotenv import load_dotenv
load_dotenv() 
import json, subprocess
import psutil  # Import the psutil library
import atexit
try: 
    ### OPTIONAL DEPENDENCIES ###  - pip install redis and celery only when a user opts into using the async endpoints which require both
    from celery import Celery
    import redis
except: 
    import sys

    subprocess.check_call(
        [
            sys.executable, 
            "-m", 
            "pip", 
            "install", 
            "redis", 
            "celery"
        ]
    )

import time
import sys, os
sys.path.insert(
    0, os.path.abspath("../../..")
)  # Adds the parent directory to the system path - for litellm local dev
import litellm

# Redis connection setup
pool = redis.ConnectionPool(host=os.getenv("REDIS_HOST"), port=os.getenv("REDIS_PORT"), password=os.getenv("REDIS_PASSWORD"), db=0, max_connections=5)
redis_client = redis.Redis(connection_pool=pool)

# Celery setup
celery_app = Celery('tasks', broker=f"redis://default:{os.getenv('REDIS_PASSWORD')}@{os.getenv('REDIS_HOST')}:{os.getenv('REDIS_PORT')}", backend=f"redis://default:{os.getenv('REDIS_PASSWORD')}@{os.getenv('REDIS_HOST')}:{os.getenv('REDIS_PORT')}")
celery_app.conf.update(
    broker_pool_limit = None,
    broker_transport_options = {'connection_pool': pool},
    result_backend_transport_options = {'connection_pool': pool},
)


# Celery task
@celery_app.task(name='process_job', max_retries=3)
def process_job(*args, **kwargs):
    try: 
        llm_router: litellm.Router = litellm.Router(model_list=kwargs.pop("llm_model_list"))
        response = llm_router.completion(*args, **kwargs) # type: ignore
        if isinstance(response, litellm.ModelResponse): 
            response = response.model_dump_json()
            return json.loads(response)
        return str(response)
    except Exception as e: 
        raise e

# Ensure Celery workers are terminated when the script exits
def cleanup():
    try:
        # Get a list of all running processes
        for process in psutil.process_iter(attrs=['pid', 'name']):
            # Check if the process is a Celery worker process
            if process.info['name'] == 'celery':
                print(f"Terminating Celery worker with PID {process.info['pid']}")
                # Terminate the Celery worker process
                psutil.Process(process.info['pid']).terminate()
    except Exception as e:
        print(f"Error during cleanup: {e}")

# Register the cleanup function to run when the script exits
atexit.register(cleanup)