service_functional.py

import requests
from functional import compose
from functools import partial
from collections import namedtuple
import itertools


class DescriptorDefinition(namedtuple('DescriptorDefinition', ['id', 'type', 'name'])):
    @classmethod
    def from_json(cls, definition_json):
        return cls(
            id=definition_json['descriptorId'],
            type=definition_json['descriptorType'],
            name=definition_json['descriptorName'])


def get_definitions_json(api_url):
    definitions_uri = '{api_url}/v1/gracenote/batch/descriptorDefinitions'.format(**locals())
    get_response = requests.get(definitions_uri)
    get_response.raise_for_status()
    return get_response.json()


definitions_list_from_json = partial(map, DescriptorDefinition.from_json)
definitions_from_api = compose(definitions_list_from_json, get_definitions_json)
load_definitions = partial(definitions_from_api, api_url='http://localhost:8000')

print load_definitions()[:2]
import numpy
a = numpy.array([0])
b = list()

"""
PROS :
 * partialed/composed definitions so declarative and simple that just DescriptorDefinition.from_json needs a unit test
 * get_definitions_json(api_url) as a straight forward declarative and simple function
CONS :
 * Ugly stack trace, not obvious what is load_definitions when debugging
"""