Source code for libcloud.pricing

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from __future__ import with_statement

A class which handles loading the pricing files.

import os.path
from os.path import join as pjoin

    import simplejson as json
except ImportError:
    import json

from libcloud.utils.connection import get_response_object

__all__ = [

# Default URL to the pricing file
DEFAULT_FILE_URL = ';a=blob_plain;f=libcloud/data/pricing.json'  # NOQA

CURRENT_DIRECTORY = os.path.dirname(os.path.abspath(__file__))
CUSTOM_PRICING_FILE_PATH = os.path.expanduser('~/.libcloud/pricing.json')

# Pricing data cache
    'compute': {},
    'storage': {}

VALID_PRICING_DRIVER_TYPES = ['compute', 'storage']

def get_pricing_file_path(file_path=None):
    if os.path.exists(CUSTOM_PRICING_FILE_PATH) and \
        # Custom pricing file is available, use it


def get_pricing(driver_type, driver_name, pricing_file_path=None):
    Return pricing for the provided driver.

    :type driver_type: ``str``
    :param driver_type: Driver type ('compute' or 'storage')

    :type driver_name: ``str`
    :param driver_name: Driver name

    :type pricing_file_path: ``str``
    :param pricing_file_path: Custom path to a price file. If not provided
                              it uses a default path.

    :rtype: ``dict``
    :return: Dictionary with pricing where a key name is size ID and
             the value is a price.
    if driver_type not in VALID_PRICING_DRIVER_TYPES:
        raise AttributeError('Invalid driver type: %s', driver_type)

    if driver_name in PRICING_DATA[driver_type]:
        return PRICING_DATA[driver_type][driver_name]

    if not pricing_file_path:
        pricing_file_path = get_pricing_file_path(file_path=pricing_file_path)

    with open(pricing_file_path) as fp:
        content =

    pricing_data = json.loads(content)
    size_pricing = pricing_data[driver_type][driver_name]

    for driver_type in VALID_PRICING_DRIVER_TYPES:
        pricing = pricing_data.get(driver_type, None)
        if pricing:
            PRICING_DATA[driver_type] = pricing

    return size_pricing

def set_pricing(driver_type, driver_name, pricing):
    Populate the driver pricing dictionary.

    :type driver_type: ``str``
    :param driver_type: Driver type ('compute' or 'storage')

    :type driver_name: ``str``
    :param driver_name: Driver name

    :type pricing: ``dict``
    :param pricing: Dictionary where a key is a size ID and a value is a price.

    PRICING_DATA[driver_type][driver_name] = pricing

def get_size_price(driver_type, driver_name, size_id):
    Return price for the provided size.

    :type driver_type: ``str``
    :param driver_type: Driver type ('compute' or 'storage')

    :type driver_name: ``str``
    :param driver_name: Driver name

    :type size_id: ``str`` or ``int``
    :param size_id: Unique size ID (can be an integer or a string - depends on
                    the driver)

    :rtype: ``float``
    :return: Size price.
    pricing = get_pricing(driver_type=driver_type, driver_name=driver_name)
    price = float(pricing[size_id])
    return price

def invalidate_pricing_cache():
    Invalidate pricing cache for all the drivers.
    PRICING_DATA['compute'] = {}
    PRICING_DATA['storage'] = {}

def clear_pricing_data():
    Invalidate pricing cache for all the drivers.

    Note: This method does the same thing as invalidate_pricing_cache and is
    here for backward compatibility reasons.

def invalidate_module_pricing_cache(driver_type, driver_name):
    Invalidate the cache for the specified driver.

    :type driver_type: ``str``
    :param driver_type: Driver type ('compute' or 'storage')

    :type driver_name: ``str``
    :param driver_name: Driver name
    if driver_name in PRICING_DATA[driver_type]:
        del PRICING_DATA[driver_type][driver_name]

[docs]def download_pricing_file(file_url=DEFAULT_FILE_URL, file_path=CUSTOM_PRICING_FILE_PATH): """ Download pricing file from the file_url and save it to file_path. :type file_url: ``str`` :param file_url: URL pointing to the pricing file. :type file_path: ``str`` :param file_path: Path where a download pricing file will be saved. """ dir_name = os.path.dirname(file_path) if not os.path.exists(dir_name): # Verify a valid path is provided msg = ('Can\'t write to %s, directory %s, doesn\'t exist' % (file_path, dir_name)) raise ValueError(msg) if os.path.exists(file_path) and os.path.isdir(file_path): msg = ('Can\'t write to %s file path because it\'s a' ' directory' % (file_path)) raise ValueError(msg) response = get_response_object(file_url) body = response.body # Verify pricing file is valid try: data = json.loads(body) except json.decoder.JSONDecodeError: msg = 'Provided URL doesn\'t contain valid pricing data' raise Exception(msg) if not data.get('updated', None): msg = 'Provided URL doesn\'t contain valid pricing data' raise Exception(msg) # No need to stream it since file is small with open(file_path, 'w') as file_handle: file_handle.write(body)