Synnefo » snf-image-creator

# -*- coding: utf-8 -*-

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"""This modules provides the interface for working with the ./kamaki library.

The library is used to upload images to and register them with a Synnefo

deployment.

"""

import sys

from os.path import basename

from kamaki.cli.config import Config

from kamaki.clients import ClientError

from kamaki.clients.image import ImageClient

from kamaki.clients.pithos import PithosClient

from kamaki.clients.astakos import AstakosClient

try:

    config = Config()

except Exception as e:

    sys.stderr.write("Kamaki config error: %s\n" % str(e))

    sys.exit(1)

class Kamaki(object):

    """Wrapper class for the ./kamaki library"""

    CONTAINER = "images"

    @staticmethod

    def get_default_cloud_name():

        """Returns the name of the default cloud"""

        clouds = config.keys('cloud')

        default = config.get('global', 'default_cloud')

        if not default:

            return clouds[0] if len(clouds) else ""

        return default if default in clouds else ""

    @staticmethod

    def set_default_cloud(name):

        """Sets a cloud account as default"""

        config.set('global', 'default_cloud', name)

        config.write()

    @staticmethod

    def get_clouds():

        """Returns the list of available clouds"""

        names = config.keys('cloud')

        clouds = {}

        for name in names:

            clouds[name] = config.get('cloud', name)

        return clouds

    @staticmethod

    def get_cloud_by_name(name):

        """Returns a dict with cloud info"""

        return config.get('cloud', name)

    @staticmethod

    def save_cloud(name, url, token, description=""):

        """Save a new cloud account"""

        cloud = {'url': url, 'token': token}

        if len(description):

            cloud['description'] = description

        config.set('cloud', name, cloud)

        # Make the saved cloud the default one

        config.set('global', 'default_cloud', name)

        config.write()

    @staticmethod

    def remove_cloud(name):

        """Deletes an existing cloud from the Kamaki configuration file"""

        config.remove_option('cloud', name)

        config.write()

    @staticmethod

    def create_account(url, token):

        """Given a valid (URL, tokens) pair this method returns an Astakos

        client instance

        """

        client = AstakosClient(url, token)

        try:

            client.authenticate()

        except ClientError:

            return None

        return client

    @staticmethod

    def get_account(cloud_name):

        """Given a saved cloud name this method returns an Astakos client

        instance

        """

        cloud = config.get('cloud', cloud_name)

        assert cloud, "cloud: `%s' does not exist" % cloud_name

        assert 'url' in cloud, "url attr is missing in %s" % cloud_name

        assert 'token' in cloud, "token attr is missing in %s" % cloud_name

        return Kamaki.create_account(cloud['url'], cloud['token'])

    def __init__(self, account, output):

        """Create a Kamaki instance"""

        self.account = account

        self.out = output

        self.pithos = PithosClient(

            self.account.get_service_endpoints('object-store')['publicURL'],

            self.account.token,

            self.account.user_info()['id'],

            self.CONTAINER)

        self.image = ImageClient(

            self.account.get_service_endpoints('image')['publicURL'],

            self.account.token)

    def upload(self, file_obj, size=None, remote_path=None, hp=None, up=None):

        """Upload a file to pithos"""

        path = basename(file_obj.name) if remote_path is None else remote_path

        try:

            self.pithos.create_container(self.CONTAINER)

        except ClientError as e:

            if e.status != 202:  # Ignore container already exists errors

                raise e

        hash_cb = self.out.progress_generator(hp) if hp is not None else None

        upload_cb = self.out.progress_generator(up) if up is not None else None

        self.pithos.upload_object(path, file_obj, size, hash_cb, upload_cb)

        return "pithos://%s/%s/%s" % (self.account.user_info()['id'],

                                      self.CONTAINER, path)

    def register(self, name, location, metadata, public=False):

        """Register an image with cyclades"""

        # Convert all metadata to strings

        str_metadata = {}

        for (key, value) in metadata.iteritems():

            str_metadata[str(key)] = str(value)

        is_public = 'true' if public else 'false'

        params = {'is_public': is_public, 'disk_format': 'diskdump'}

        return self.image.register(name, location, params, str_metadata)

    def share(self, location):

        """Share this file with all the users"""

        self.pithos.set_object_sharing(location, "*")

    def object_exists(self, location):

        """Check if an object exists in pythos"""

        try:

            self.pithos.get_object_info(location)

        except ClientError as e:

            if e.status == 404:  # Object not found error

                return False

            else:

                raise

        return True

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