Synnefo

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from synnefo.util import units

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

from astakos.im import quotas

import logging

logger = logging.getLogger(__name__)

resource_fields = ['desc', 'unit', 'ui_visible', 'api_visible']

class RegisterException(Exception):

    pass

def different_component(service, resource):

    try:

        registered_for = Service.objects.get(name=resource.service_origin)

        return registered_for.component != service.component

    except Service.DoesNotExist:

        return False

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.select_for_update().get(name=name)

        exists = True

        if r.service_type != service_type and \

                different_component(service, r):

            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 and \

                different_component(service, r):

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

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

            raise RegisterException(m)

        r.service_origin = service_origin

        r.service_type = service_type

    except Resource.DoesNotExist:

        r = Resource(name=name,

                     uplimit=units.PRACTICALLY_INFINITE,

                     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)

    if r.ui_visible and not r.api_visible:

        m = "Flag 'ui_visible' should entail 'api_visible'."

        raise RegisterException(m)

    r.save()

    if not exists:

        quotas.qh_sync_new_resource(r)

    if exists:

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

    else:

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

    return r, exists

def update_resources(updates):

    resources = []

    for resource, uplimit in updates:

        resources.append(resource)

        old_uplimit = resource.uplimit

        if uplimit == old_uplimit:

            logger.info("Resource %s has limit %s; no need to update."

                        % (resource.name, uplimit))

        else:

            resource.uplimit = uplimit

            resource.save()

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

                        % (resource.name, uplimit))

def resources_to_dict(resources):

    resource_dict = {}

    for r in resources:

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

    return resource_dict

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)

    return rs

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

    rs = get_resources(resources, services)

    return rs.filter(api_visible=True)

def add_endpoint(component, service, endpoint_dict, out=None):

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

    for key, value in endpoint_dict.iteritems():

        base_url = component.base_url

        if key == "publicURL" and (base_url is None or

                                   not value.startswith(base_url)):

            warn = out.write if out is not None else logger.warning

            warn("Warning: Endpoint URL '%s' does not start with "

                 "assumed component base URL '%s'.\n" % (value, base_url))

        EndpointData.objects.create(

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

def add_service(component, name, service_type, endpoints, out=None):

    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()

        for key, value in defaults.iteritems():

            setattr(service, key, value)

        service.save()

    for endpoint in endpoints:

        add_endpoint(component, service, endpoint, out=out)

    return not created