Synnefo » snf-occi

from snfOCCI.config import SERVER_CONFIG

from occi.backend import ActionBackend, KindBackend

from occi.extensions.infrastructure import START, STOP, SUSPEND, RESTART

from occi.exceptions import HTTPError

#Compute Backend for snf-occi-server

class MyBackend(KindBackend, ActionBackend):

    # Updating and Replacing compute instances not supported by Cyclades

    def update(self, old, new, extras):

        raise HTTPError(501, "Update is currently no applicable")

    def replace(self, old, new, extras):

        raise HTTPError(501, "Replace is currently no applicable")

class ComputeBackend(MyBackend):

    '''

    Backend for Cyclades/Openstack compute instances

    '''

    def create(self, entity, extras):

        #Creating new compute instance

        try:

            snf = extras['snf']

            for mixin in entity.mixins:

                if mixin.related[0].term == 'os_tpl':

                    image_id = mixin.attributes['occi.core.id']

                if mixin.related[0].term == 'resource_tpl':

                    flavor = mixin

                    flavor_id = mixin.attributes['occi.core.id']

            vm_name = entity.attributes['occi.core.title']

            info = snf.create_server(vm_name, flavor_id, image_id)

            entity.actions = [START]

            entity.attributes['occi.compute.state'] = 'inactive'

            entity.attributes['occi.core.id'] = str(info['id'])

            entity.attributes['occi.compute.architecture'] = SERVER_CONFIG['compute_arch']

            entity.attributes['occi.compute.cores'] = flavor.attributes['occi.compute.cores']

            entity.attributes['occi.compute.memory'] = flavor.attributes['occi.compute.memory']

            entity.attributes['occi.compute.hostname'] = SERVER_CONFIG['hostname'] % {'id':info['id']}

        except (UnboundLocalError, KeyError) as e:

            raise HTTPError(406, 'Missing details about compute instance')

    def retrieve(self, entity, extras):

        #Triggering cyclades to retrieve up to date information

        snf = extras['snf']

        vm_id = int(entity.attributes['occi.core.id'])

        vm_info = snf.get_server_details(vm_id)

        vm_state = vm_info['status']

        status_dict = {'ACTIVE' : 'active',

                       'STOPPED' : 'inactive',

                       'ERROR' : 'inactive',

                       'BUILD' : 'inactive',

                       'DELETED' : 'inactive',

                       }

        entity.attributes['occi.compute.state'] = status_dict[vm_state]

        if vm_state == 'ERROR':

            raise HTTPError(500, 'ERROR building the compute instance')

        else:

            if entity.attributes['occi.compute.state'] == 'inactive':

                entity.actions = [START]

            if entity.attributes['occi.compute.state'] == 'active': 

                entity.actions = [STOP, SUSPEND, RESTART]

    def delete(self, entity, extras):

        #Deleting compute instance

        snf = extras['snf']

        vm_id = int(entity.attributes['occi.core.id'])

        snf.delete_server(vm_id)

    def action(self, entity, action, extras):

        #Triggering action to compute instances

        client = extras['client']

        snf = extras['snf']

        vm_id = int(entity.attributes['occi.core.id'])

        vm_info = snf.get_server_details(vm_id)

        vm_state = vm_info['status']

        if vm_state == 'ERROR':

            raise HTTPError(500, 'ERROR building the compute instance')

        else:

            if action not in entity.actions:

                raise AttributeError("This action is currently no applicable.")

            elif action == START:

                print "Starting VM"

                client.start_server(vm_id)

            elif action == STOP:

                print "Stopping VM"

                client.shutdown_server(vm_id)

            elif action == RESTART:

                print "Restarting VM"

                snf.reboot_server(vm_id)

            elif action == SUSPEND:

                raise HTTPError(501, "This actions is currently no applicable")