Synnefo

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from astakos.im.models import Resource, Service, Endpoint, EndpointData

from astakos.im.quotas import qh_add_resource_limit, qh_sync_new_resource

import logging

logger = logging.getLogger(__name__)

resource_fields = ['desc', 'unit', 'allow_in_projects']

class RegisterException(Exception):

    pass

def add_resource(resource_dict):

    name = resource_dict.get('name')

    service_type = resource_dict.get('service_type')

    service_origin = resource_dict.get('service_origin')

    if not name or not service_type or not service_origin:

        raise RegisterException("Malformed resource dict.")

    try:

        service = Service.objects.get(name=service_origin)

    except Service.DoesNotExist:

        m = "There is no service %s." % service_origin

        raise RegisterException(m)

    try:

        r = Resource.objects.get_for_update(name=name)

        exists = True

        if r.service_type != service_type:

            m = ("There already exists a resource named %s with service "

                 "type %s." % (name, r.service_type))

            raise RegisterException(m)

        if r.service_origin != service_origin:

            m = ("There already exists a resource named %s registered for "

                 "service %s." % (name, r.service_origin))

            raise RegisterException(m)

    except Resource.DoesNotExist:

        r = Resource(name=name,

                     uplimit=0,

                     service_type=service_type,

                     service_origin=service_origin)

        exists = False

    for field in resource_fields:

        value = resource_dict.get(field)

        if value is not None:

            setattr(r, field, value)

    r.save()

    if not exists:

        qh_sync_new_resource(r, 0)

    if exists:

        logger.info("Updated resource %s." % (name))

    else:

        logger.info("Added resource %s." % (name))

    return r, exists

def update_resource(resource, uplimit):

    old_uplimit = resource.uplimit

    resource.uplimit = uplimit

    resource.save()

    logger.info("Updated resource %s with limit %s."

                % (resource.name, uplimit))

    diff = uplimit - old_uplimit

    if diff != 0:

        qh_add_resource_limit(resource, diff)

def get_resources(resources=None, services=None):

    if resources is None:

        rs = Resource.objects.all()

    else:

        rs = Resource.objects.filter(name__in=resources)

    if services is not None:

        rs = rs.filter(service__in=services)

    resource_dict = {}

    for r in rs:

        resource_dict[r.full_name()] = r.get_info()

    return resource_dict

def add_endpoint(service, endpoint_dict):

    endpoint = Endpoint.objects.create(service=service)

    for key, value in endpoint_dict.iteritems():

        EndpointData.objects.create(

            endpoint=endpoint, key=key, value=value)

def add_service(component, name, service_type, endpoints):

    defaults = {'component': component,

                'type': service_type,

                }

    service, created = Service.objects.get_or_create(

        name=name, defaults=defaults)

    if not created:

        if service.component != component:

            m = ("There is already a service named %s registered by %s." %

                 (name, service.component.name))

            raise RegisterException(m)

        service.endpoints.all().delete()

    else:

        service.component = component

        service.type = service_type

        service.save()

    for endpoint in endpoints:

        add_endpoint(service, endpoint)

    return not created