Django manage.py wrapper script for Google App Engine

I’m used to running mange.py in my Django apps and I kept forgetting the name of the Google App Engine equivalents. My script only knows how to do two things at the moment, “runserver” and “publish” but now I can manage everything the way I’m accustomed to.

Update: Aprill 11 – Added toggle_debug, automatically switches debug off when publishing and back on for development.

#!/usr/bin/env python
#
# Simple convience script for common publishing and develop tasks
# This script expects dev_appserver.py to be in your $PATH
import os, sys, re

def main(argv):

    command = ""

    try:
        command = argv[1]
    except:
        usage()
        exit(2)

    if command == 'publish':
        publish()
    elif command == 'publish-debug':
        publish(True)
    elif command == 'runserver':
        runserver()
    elif command == "--help" or command == "-h":
        usage()
        exit(0)

def usage():
    print """
    Usage: python manage.py [command] 

    Commands:
        publish - 'updates' Google App Engine with your current version
        publish-debug - 'updates' Goolge App Engine with debug turned on
        runserver - launches the development server on port 8080

    Options:
        --help, -h - Prints this screen

    For more information on a particular command, run [command] --help
    """
def get_gae_dir():
    """ Locate dev_appserver.py and return the directory is in. """

    # There's probably a smarter way to do this...
    script = 'dev_appserver.py'
    stdin, stdout = os.popen2('which %s'%script)
    xpath = stdout.read().strip()
    stdout.close()
    stdin.close()

    # If the file is a symlink, find out where the actual file lives.
    try:
        tmpdir = os.readlink(xpath)
    except OSError:
        tmpdir = xpath

    return os.path.abspath(os.path.dirname(tmpdir))

def toggle_debug(status):
    st = 'False'
    if status:
        st = 'True'

    os.rename('settings.py','settings.py.bak')
    orig = open('settings.py.bak').read()
    p = re.compile('DEBUG\s=\s(True|False)')
    n = p.sub('DEBUG = %s'%st,orig)
    nw = open('settings.py','w')
    nw.write(n)
    nw.close()

def gae_parent(script):

    DIR_PATH = get_gae_dir()
    DEV_APPSERVER_PATH = os.path.join(DIR_PATH,'google/appengine/tools/%s'%script)

    EXTRA_PATHS = [
      DIR_PATH,
      os.path.join(DIR_PATH, 'lib', 'django'),
      os.path.join(DIR_PATH, 'lib', 'webob'),
      os.path.join(DIR_PATH, 'lib', 'yaml', 'lib'),
    ]

    sys.path = EXTRA_PATHS + sys.path
    execfile(DEV_APPSERVER_PATH, globals())

def publish(debug=False):

    if(debug):
        toggle_debug(True)
    else:
        toggle_debug(False)

    sys.argv[1] = "update"
    try:
        sys.argv[2] = os.path.abspath(os.path.dirname(os.path.realpath(__file__)))
    except IndexError:
        sys.argv.append(os.path.abspath(os.path.dirname(os.path.realpath(__file__))))

    gae_parent('appcfg.py')

def runserver():
    toggle_debug(True)
    sys.argv[1] = os.path.abspath(os.path.dirname(os.path.realpath(__file__)))
    gae_parent('dev_appserver_main.py')

if __name__ == '__main__':
    main(sys.argv)
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