hupper

in-process file monitor / reloader for reloading your code automatically during development

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Readme

======

hupper

.. image:: https://img.shields.io/pypi/v/hupper.svg :target: https://pypi.python.org/pypi/hupper

.. image:: https://github.com/Pylons/hupper/workflows/Build/test%20on%20Linux/badge.svg?branch=master :target: https://github.com/Pylons/hupper/actions?query=workflow%3A%22Build%2Ftest+on+Linux%22

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.. image:: https://readthedocs.org/projects/hupper/badge/?version=latest :target: https://readthedocs.org/projects/hupper/?badge=latest :alt: Documentation Status

hupper is an integrated process monitor that will track changes to any imported Python files in sys.modules as well as custom paths. When files are changed the process is restarted.

Command-line Usage

Hupper can load any Python code similar to python -m <module> by using the hupper -m <module> program.

.. code-block:: console

$ hupper -m myapp Starting monitor for PID 23982.

API Usage

Start by defining an entry point for your process. This must be an importable path in string format. For example, myapp.scripts.serve.main.

.. code-block:: python

# myapp/scripts/serve.py

import sys
import hupper
import waitress


def wsgi_app(environ, start_response):
    start_response('200 OK', [('Content-Type', 'text/plain')])
    yield b'hello'


def main(args=sys.argv[1:]):
    if '--reload' in args:
        # start_reloader will only return in a monitored subprocess
        reloader = hupper.start_reloader('myapp.scripts.serve.main')

        # monitor an extra file
        reloader.watch_files(['foo.ini'])

    waitress.serve(wsgi_app)

Acknowledgments

hupper is inspired by initial work done by Carl J Meyer and David Glick during a Pycon sprint and is built to be a more robust and generic version of Ian Bicking's excellent PasteScript paste serve --reload and Pyramid's pserve --reload.

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