root / compute.py @ 22167a8c
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from kamaki.clients.compute import ComputeClient |
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from kamaki.clients.cyclades import CycladesClient |
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from kamaki.config import Config |
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from occi.backend import ActionBackend, KindBackend |
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from occi.extensions.infrastructure import COMPUTE, START, STOP, SUSPEND, RESTART |
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#Compute Backend for snf-occi-server
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class MyBackend(KindBackend, ActionBackend): |
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'''
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An very simple abstract backend which handles update and replace for
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attributes. Support for links and mixins would need to added.
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'''
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def update(self, old, new, extras): |
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# here you can check what information from new_entity you wanna bring
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# into old_entity
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# trigger your hypervisor and push most recent information
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print('Updating a resource with id: ' + old.identifier)
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for item in new.attributes.keys(): |
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old.attributes[item] = new.attributes[item] |
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def replace(self, old, new, extras): |
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print('Replacing a resource with id: ' + old.identifier)
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old.attributes = {} |
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for item in new.attributes.keys(): |
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old.attributes[item] = new.attributes[item] |
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old.attributes['occi.compute.state'] = 'inactive' |
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class ComputeBackend(MyBackend): |
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'''
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Backend for Cyclades/Openstack compute instances
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'''
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def create(self, entity, extras): |
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for mixin in entity.mixins: |
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if mixin.related[0].term == 'os_tpl': |
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image = mixin |
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image_id = mixin.attributes['occi.core.id']
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if mixin.related[0].term == 'resource_tpl': |
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flavor = mixin |
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flavor_id = mixin.attributes['occi.core.id']
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entity.attributes['occi.compute.state'] = 'active' |
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entity.actions = [STOP, SUSPEND, RESTART] |
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#Registry identifier is the uuid key occi.handler assigns
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#attribute 'occi.core.id' will be the snf-server id
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conf = Config() |
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conf.set('token',extras['token']) |
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snf = ComputeClient(conf) |
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vm_name = entity.attributes['occi.compute.hostname']
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info = snf.create_server(vm_name, flavor_id, image_id) |
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entity.attributes['occi.core.id'] = str(info['id']) |
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entity.attributes['occi.compute.cores'] = flavor.attributes['occi.compute.cores'] |
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entity.attributes['occi.compute.memory'] = flavor.attributes['occi.compute.memory'] |
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def retrieve(self, entity, extras): |
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# triggering cyclades to retrieve up to date information
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conf = Config() |
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conf.set('token',extras['token']) |
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snf = ComputeClient(conf) |
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vm_id = int(entity.attributes['occi.core.id']) |
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vm_info = snf.get_server_details(vm_id) |
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vm_state = vm_info['status']
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status_dict = {'ACTIVE' : 'active', |
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'STOPPED' : 'inactive', |
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'ERROR' : 'inactive', |
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'BUILD' : 'inactive', |
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'DELETED' : 'inactive', |
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} |
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entity.attributes['occi.compute.state'] = status_dict[vm_state]
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if entity.attributes['occi.compute.state'] == 'inactive': |
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entity.actions = [START] |
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if entity.attributes['occi.compute.state'] == 'active': |
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entity.actions = [STOP, SUSPEND, RESTART] |
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if entity.attributes['occi.compute.state'] == 'suspended': |
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entity.actions = [START] |
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def delete(self, entity, extras): |
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# delete vm with vm_id = entity.attributes['occi.core.id']
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conf = Config() |
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conf.set('token',extras['token']) |
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snf = ComputeClient(conf) |
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vm_id = int(entity.attributes['occi.core.id']) |
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snf.delete_server(vm_id) |
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def action(self, entity, action, extras): |
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conf = Config() |
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conf.set('token',extras['token']) |
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client = CycladesClient(conf) |
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vm_id = int(entity.attributes['occi.core.id']) |
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if action not in entity.actions: |
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raise AttributeError("This action is currently no applicable.") |
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elif action == START:
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print "Starting VM" |
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client.start_server(vm_id) |
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elif action == STOP:
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print "Stopping VM" |
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client.shutdown_server(vm_id) |
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elif action == RESTART:
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print "Restarting VM" |
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snf.reboot_server(vm_id) |
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elif action == SUSPEND:
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#TODO VM suspending
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print "Suspending VM" |