FIX FILE WATCHER

This a simple fix to the unbearable default solution of google-cloud-sdk for the autoreload function of the dev_appserver. Indeed google decided to default to a pooling thread that consistently uses tons of CPU to check if the files of the project have been edited.

So, to fix that, you just need to use this simple script, that will replace the default file_watcher implementation of the SDK, and replace it by a way more simpler version based on watchdog. The latest version of watchdog will be added to the google cloud dependencies, so no need to add it to you environment.

HOW TO INSTALL

As simple as:

python fix_watcher.py

By default, it will assume that the sdk is installed at

/home/user/google-cloud-sdk

Here all this too can do:

foo@bar:~$ python fix_watcher -h
usage: fix_watcher.py [-h] [-t PATH] [--uninstall] [-f PATH]

Will install watchdog into local google-appengine-sdk and use it to improve
performances

optional arguments:
  -h, --help            show this help message and exit
  -t PATH, --to PATH    PATH to the google cloud SDK
  --uninstall           removes watchdog and restores files to original state
  -f PATH, --from PATH  PATH to the google cloud SDK to uninstall. By default
                        will reuse PATH from last install

Set SDK location

GOOGLE_SDK_PATH='/path/to/google-cloud-sdk'
python fix_wacther.py --target $GOOGLE_SDK_PATH

Configuration

You can configure teh file watcher by adding these options in you Setup.cgf

[appengine:file_watcher]
watcher_extension=.js,.html,.css,.py

With each option being:

Option	Definition	Default Value
watcher_extension	list of .ext separated by a ,	.go,.py,.yaml (see mtime_file_watcher)