auto reload LocalDevServer on module change

[aldegoeij]

Hello guys! Love the work on Chalice, makes life with API Gateway much easier.

What framework do you use for the LocalDevServer? Currently it does not auto reload on a change (save) of a module under development, which slows down development quite a bit.

Are you using bare BaseHTTPServer only? Is it easy to implement a reloader?

[jamesls]

We're using BaseHTTPServer. It should be possible to implement a reloader, not sure on how easy it would be, but I think it would be useful to have. Marking as feature request.

[Marcelo-Theodoro]

+1.

It's easy to look for changed files using os.static and checking the st_mtime attribute. Like werkzeug[1]. The checking could be done in the LocalDevServer.serve_forever but instead of using the HTTPServer.serve_forever, the LocalDevServer.serve_forever would use the HTTPServer.handle_request inside a loop. Would this change have bad implications?

However I'm not sure of how to reload the application itself when we detect that a file changed. Just re-import everything?

[1] https://github.com/pallets/werkzeug/blob/368ccb07d097660156eb19a0ec2042bc53e68238/werkzeug/_reloader.py#L137

[tzookb]

wish I wasnt a python newb and could have helped with this :/

[rapidoo]

+1

[mlecoq]

+1

[marcmillien]

While waiting for the feature, you can use watchdog and the command watchmedo:

watchmedo \
  auto-restart \
  --patterns="*.py" \
  --ignore-directories \
  --recursive \
  -- chalice local

Or other equivalents 😁 .

[trickidicki]

@marcmillien Alas watchmedo auto-restart doesn't work on Windows...
gorakhargosh/watchdog#387
:-((

[juliensimon]

+1, would love to have this.

[cdalar]

+1

[jamesls]

Implemented in #846. This will go out in the next release.