Synnefo

# Copyright 2013 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from synnefo.util.entry_points import extend_dict_from_entry_point

from synnefo.util.keypath import customize_from_items

from synnefo.lib.services import fill_endpoints

from synnefo.lib import parse_base_url

from synnefo.settings.setup import Setting, Mandatory, Auto, Default

CUSTOMIZE_SERVICES = Default(

    default_value=(),

    example_value={'cyclades_ui.prefix': 'view',

                   'astakos_ui.prefix': 'view'},

    export=0,

    #dependencies=('SYNNEFO_SERVICES',)  #uncomment this to test cycle

    description=("A list of key-path and value pairs that would be applied to "

                 "the services registry after its automatic initialization."),

)

services = {}

extend_dict_from_entry_point(services, 'synnefo', 'services')

from sys import modules

module = modules[__name__]

components = {}

for service_name, service in services.items():

    component_name = service['component']

    if component_name not in components:

        components[component_name] = {}

    components[component_name][service_name] = service

base_url_names = []

for component_name in components:

    name_upper = component_name.upper()

    base_url_name = name_upper + '_BASE_URL'

    base_url_names.append(base_url_name)

    base_url_example_value = "https://{comp}.example.synnefo.org/{comp}/"

    base_url_example_value = base_url_example_value.format(comp=component_name)

    base_url_description = (

        "The HTTP URL prefix (scheme, host, and path) beneath which all "

        "services for component {comp} reside.")

    base_url_description = base_url_description.format(comp=component_name)

    base_url_setting = Mandatory(

        example_value=base_url_example_value,

        description=base_url_description,

    )

    setattr(module, base_url_name, base_url_setting)

    def mk_auto_configure_base_host(base_url_name):

        def auto_configure_base_host(setting, value, deps):

            Setting.enforce_not_configurable(setting, value)

            base_url = deps[base_url_name]

            base_host, base_path = parse_base_url(base_url)

            return base_host

        return auto_configure_base_host

    base_host_name = name_upper + '_BASE_HOST'

    base_host_description = "The host part of {base}. Cannot be configured."

    base_host_description = base_host_description.format(base=base_url_name)

    base_host_setting = Auto(

        configure_callback=mk_auto_configure_base_host(base_url_name),

        export=0,

        dependencies=(base_url_name,),

        description=base_host_description,

    )

    setattr(module, base_host_name, base_host_setting)

    def mk_auto_configure_base_path(base_url_name):

        def auto_configure_base_path(setting, value, deps):

            Setting.enforce_not_configurable(setting, value)

            base_url = deps[base_url_name]

            base_host, base_path = parse_base_url(base_url)

            return base_path

        return auto_configure_base_path

    base_path_name = name_upper + '_BASE_PATH'

    base_path_description = "The path part of {base}. Cannot be configured."

    base_path_description = base_path_description.format(base=base_url_name)

    base_path_setting = Auto(

        configure_callback=mk_auto_configure_base_path(base_url_name),

        export=0,

        dependencies=(base_url_name,),

        description=base_path_description,

    )

    setattr(module, base_path_name, base_path_setting)

SYNNEFO_COMPONENTS = Auto(

    configure_callback=Setting.enforce_not_configurable,

    export=0,

    default_value=components,

    description=("A list with the names of all synnefo components currently "

                 "installed. Initialized from SYNNEFO_SERVICES. "

                 "It is dynamically generated and cannot be configured."),

    dependencies=('SYNNEFO_SERVICES',),

)

def auto_configure_services(setting, value, deps):

    Setting.enforce_not_configurable(setting, value)

    services = setting.default_value

    customization = deps['CUSTOMIZE_SERVICES']

    if isinstance(customization, dict):

        customization = customization.items()

    customize_from_items(services, customization)

    for service_name, service in services.iteritems():

        component_name = service['component']

        base_url_name = component_name.upper() + '_BASE_URL'

        base_url = deps[base_url_name]

        fill_endpoints(service, base_url)

    return services

SYNNEFO_SERVICES = Auto(

    configure_callback=auto_configure_services,

    export=0,

    default_value=services,

    dependencies=('CUSTOMIZE_SERVICES',) + tuple(base_url_names),

    description=("An auto-generated registry of all services provided by all "

                 "currently installed Synnefo components. "

                 "It is dynamically generated and cannot be configured. "

                 "For service customization use CUSTOMIZE_SERVICES."),

)