A script to quickly look at what your app's config looks like with defaults

mesos-apps-flatten.py

import json
import sys
import collections

def dict_merge(dictionary, merge_dictionary):
    for key, val in merge_dictionary.iteritems():
        if (key in dictionary and isinstance(dictionary[key], dict)
                and isinstance(merge_dictionary[key], collections.Mapping)):
            dict_merge(dictionary[key], merge_dictionary[key])
        else:
            dictionary[key] = merge_dictionary[key]

def main():
    
    if len(sys.argv) is not 2:
        print("Incorrect arguments supplied.")
        sys.exit(1)

    filepath = sys.argv[1]
    (environment, product, servicefile) = tuple(filepath.split("/"))
    
    # deep merge defaults
    app_defaults = "_defaults/{}/{}".format(product, servicefile)
    product_defaults = "{}/{}/_defaults.json".format(environment, product)
    configs = [app_defaults, product_defaults, filepath]
    final_config = {}

    for config_path in configs:
        try:
            dict_merge(final_config, json.load(open(config_path)))
        except IOError:
            continue

    print(final_config)

if __name__ == '__main__':
    main()

haha remember mesos