checktheroads-hyperglass/hyperglass/gunicorn_config.py.example

"""
https://github.com/checktheroads/hyperglass
Guncorn configuration
"""
import os
import multiprocessing
from logzero import logger

command = "/usr/local/bin/gunicorn"
pythonpath = "/opt/hyperglass"
bind = "[::1]:8001"
preload = True
workers = multiprocessing.cpu_count() * 2
user = "www-data"
timeout = 60
keepalive = 10

# Prometheus Multiprocessing directory, set as environment variable
prometheus_multiproc_dir = ".prometheus_multiproc_dir"


def on_starting(server):  # pylint: disable=unused-argument
    """Pre-startup Gunicorn Tasks"""
    try:
        # Renders Jinja2 -> Sass, compiles Sass -> CSS prior to worker load
        import hyperglass.render

        hyperglass.render.css()
        print(1)
    except ImportError as error_exception:
        logger.error(f"Exception occurred:\n{error_exception}")
    #
    os.mkdir(prometheus_multiproc_dir)
    os.environ["prometheus_multiproc_dir"] = prometheus_multiproc_dir


def worker_exit(server, worker):  # pylint: disable=unused-argument
    """Prometheus multiprocessing WSGI support"""
    from prometheus_client import multiprocess

    multiprocess.mark_process_dead(worker.pid)


def on_exit(server):
    try:
        import shutil
    except ImportError as error_exception:
        logger.error(f"Exception occurred:\n{error_exception}")

    shutil.rmtree(prometheus_multiproc_dir)