feat(worker): load config using shared helpers

BREAKING CHANGE: The worker `RMQ_CONFIG_FILE` environement variable has
been renamed to `LIBRETIME_CONFIG_FILEPATH`. In addition the systemd
working directory for the worker has changed from `/srv/airtime` to
`/var/lib/libretime/worker`.

install

@@ -1055,6 +1055,7 @@ verbose "...Done"
 
 verbose "\n * Installing celery..."
 loudCmd "$pip_cmd install ${AIRTIMEROOT}/worker"
+mkdir_and_chown "${web_user}:${web_user}" "${LIBRETIME_WORKING_DIR}/worker"
 # Create the Celery user
 if $is_centos_dist; then
   loudCmd "id celery 2>/dev/null || adduser --no-create-home -c 'LibreTime Celery' -r celery || true"

worker/Makefile

@@ -2,7 +2,7 @@ all: lint
 
 include ../tools/python.mk
 
-PIP_INSTALL := --editable .
+PIP_INSTALL := --editable .[dev]
 PYLINT_ARG := libretime_worker || true
 MYPY_ARG := libretime_worker || true
 BANDIT_ARG := libretime_worker || true

worker/install/systemd/libretime-celery.service

@@ -1,13 +1,18 @@
 [Unit]
-Description=LibreTime Celery Service
-After=network.target
+Description=LibreTime Worker Service
 
 [Service]
-User=celery
-Group=celery
-Environment=RMQ_CONFIG_FILE=/etc/airtime/airtime.conf
-WorkingDirectory=/srv/airtime
-ExecStart=/usr/local/bin/celery worker -A libretime_worker.tasks:celery --time-limit=1800 --concurrency=1 --config=celeryconfig -l INFO
+Environment=LIBRETIME_CONFIG_FILEPATH=/etc/airtime/airtime.conf
+WorkingDirectory=/var/lib/libretime/worker
+
+ExecStart=/usr/local/bin/celery worker \
+    --app=libretime_worker.tasks:worker \
+    --config=libretime_worker.config \
+    --time-limit=1800 \
+    --concurrency=1 \
+    --loglevel=INFO
+User=libretime-worker
+Group=libretime-worker
 Restart=always
 
 [Install]

worker/libretime_worker/__init__.py

@@ -1,4 +0,0 @@
-import os
-
-# Make the celeryconfig module visible to celery
-os.environ["CELERY_CONFIG_MODULE"] = "libretime_worker.celeryconfig"

worker/libretime_worker/config.py

@@ -1,30 +1,19 @@
-import os
+from os import getenv
 
-from configobj import ConfigObj
 from kombu import Exchange, Queue
-
-# Get the broker string from airtime.conf
-RMQ_CONFIG_SECTION = "rabbitmq"
+from libretime_shared.config import BaseConfig, RabbitMQConfig
 
 
-def get_rmq_broker():
-    rmq_config = ConfigObj(os.environ["RMQ_CONFIG_FILE"])
-    rmq_settings = parse_rmq_config(rmq_config)
-    return "amqp://{username}:{password}@{host}:{port}/{vhost}".format(**rmq_settings)
+class Config(BaseConfig):
+    rabbitmq: RabbitMQConfig = RabbitMQConfig()
 
 
-def parse_rmq_config(rmq_config):
-    return {
-        "host": rmq_config[RMQ_CONFIG_SECTION]["host"],
-        "port": rmq_config[RMQ_CONFIG_SECTION]["port"],
-        "username": rmq_config[RMQ_CONFIG_SECTION]["user"],
-        "password": rmq_config[RMQ_CONFIG_SECTION]["password"],
-        "vhost": rmq_config[RMQ_CONFIG_SECTION]["vhost"],
-    }
+LIBRETIME_CONFIG_FILEPATH = getenv("LIBRETIME_CONFIG_FILEPATH")
 
+config = Config(filepath=LIBRETIME_CONFIG_FILEPATH)
 
 # Celery amqp settings
-BROKER_URL = get_rmq_broker()
+BROKER_URL = config.rabbitmq.url
 CELERY_RESULT_BACKEND = "amqp"  # Use RabbitMQ as the celery backend
 CELERY_RESULT_PERSISTENT = True  # Persist through a broker restart
 CELERY_TASK_RESULT_EXPIRES = 900  # Expire task results after 15 minutes

worker/libretime_worker/tasks.py

@@ -1,12 +1,10 @@
 import cgi
 import json
-import os
 import posixpath
 import shutil
 import tempfile
 import traceback
 from contextlib import closing
-from io import StringIO
 from urllib.parse import urlsplit
 
 import mutagen
@@ -14,11 +12,11 @@ import requests
 from celery import Celery
 from celery.utils.log import get_task_logger
 
-celery = Celery()
+worker = Celery()
 logger = get_task_logger(__name__)
 
 
-@celery.task(name="podcast-download", acks_late=True)
+@worker.task(name="podcast-download", acks_late=True)
 def podcast_download(
     id, url, callback_url, api_key, podcast_name, album_override, track_title
 ):
@@ -138,7 +136,7 @@ def get_filename(r):
             filename = params["filename"]
         except Exception as e:
             # We end up here if we get a Content-Disposition header with no filename
-            logger.warn(
+            logger.warning(
                 "Couldn't find file name in Content-Disposition header, using url"
             )
     if not filename:

worker/setup.py

@@ -24,9 +24,13 @@ setup(
     install_requires=[
         "celery==4.4.7",
         "kombu==4.6.10",
-        "configobj",
         "mutagen>=1.31.0",
         "requests>=2.7.0",
     ],
+    extras_require={
+        "dev": [
+            f"libretime-shared @ file://localhost{here.parent / 'shared'}",
+        ],
+    },
     zip_safe=False,
 )