STATE_TRANSITIONS dictionary values are changed to strings.
Our assumption that Python's functions and methods are first class members
and using the method names directly as dictionary values doesn't seem to
work. So we are using method names as strings in STATE_TRANSITIONS
dictionary and getting the method object using getattr.
#! /usr/bin/python2.5
# Copyright 2009 the Melange authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""A script to generate the app.yaml from the template with an application
name filled in.
Usage:
gen_app_yaml.py [-f] APPLICATION_NAME
Arguments:
APPLICATION_NAME: the name to use for the application (no underscores)
Flags:
-f: overwrite an existing app.yaml (default=false)
"""
from __future__ import with_statement
__authors__ = [
# alphabetical order by last name, please
'"Dan Bentley" <dbentley@google.com>',
]
import os
import sys
def generateAppYaml(application_name, force=False):
"""Generate the app.yaml file.
Args:
application_name: str, the name to write into the application filed
force: bool, whether to overwrite an existing app.yaml
"""
scripts_directory = os.path.dirname(__file__)
app_dir = os.path.abspath(os.path.join(scripts_directory, '../app'))
template_path = os.path.join(app_dir, 'app.yaml.template')
app_yaml_path = os.path.join(app_dir, 'app.yaml')
if not os.path.exists(template_path):
sys.exit("Template file %s non-existent. Corrupt client?" % template_path)
if os.path.exists(app_yaml_path):
if not force:
sys.exit("%s exists; exiting. To overwrite, pass -f on the command-line"
% app_yaml_path)
with open(template_path) as infile:
template_contents = infile.read()
app_yaml_contents = template_contents.replace(
'# application: FIXME',
'application: '+ application_name)
with open(app_yaml_path, 'w') as outfile:
outfile.write(app_yaml_contents)
print "Wrote application name %s to %s." % (application_name, app_yaml_path)
def usage(msg):
"""Print an error message and the usage of the program; then quit.
"""
sys.exit('Error: %s\n\n%s' % (msg, __doc__))
def main(args):
"""Main program.
"""
if not args:
usage("No arguments supplied.")
if args[0] == '-f':
force = True
args = args[1:]
else:
force = False
if len(args) != 1:
usage("No application name supplied.")
application_name = args[0]
generateAppYaml(application_name, force=force)
if __name__ == '__main__':
main(sys.argv[1:]) # strip off the binary name