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 CachedAstakosClient as 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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