def _load_instance(self, instance_id, force_reload=True):
"""
Return instance with the given id.
For performance reasons, the instance ID is first searched for in the
collection of VM instances started by ElastiCluster
(`self._instances`), then in the list of all instances known to the
cloud provider at the time of the last update
(`self._cached_instances`), and finally the cloud provider is directly
queried.
:param str instance_id: instance identifier
:param bool force_reload:
if ``True``, skip searching caches and reload instance from server
and immediately reload instance data from cloud provider
:return: py:class:`novaclient.v1_1.servers.Server` - instance
:raises: `InstanceError` is returned if the instance can't
be found in the local cache or in the cloud.
"""
self._init_os_api()
if force_reload:
try:
# Remove from cache and get from server again
vm = self.nova_client.servers.get(instance_id)
except NotFound:
raise InstanceNotFoundError(
"Instance `{instance_id}` not found".format(
instance_id=instance_id))
# update caches
self._instances[instance_id] = vm
self._cached_instances[instance_id] = vm
# if instance is known, return it
if instance_id in self._instances:
return self._instances[instance_id]
# else, check (cached) list from provider
if instance_id not in self._cached_instances:
# Refresh the cache, just in case
self._cached_instances = dict(
(vm.id, vm) for vm in self.nova_client.servers.list())
if instance_id in self._cached_instances:
inst = self._cached_instances[instance_id]
self._instances[instance_id] = inst
return inst
# If we reached this point, the instance was not found neither
# in the caches nor on the website.
raise InstanceNotFoundError(
"Instance `{instance_id}` not found".format(
instance_id=instance_id))
def _load_instance(self, instance_id):
"""
Return instance with the given id.
For performance reasons, the instance ID is first searched for in the
collection of VM instances started by ElastiCluster
(`self._instances`), then in the list of all instances known to the
cloud provider at the time of the last update
(`self._cached_instances`), and finally the cloud provider is directly
queried.
:param str instance_id: instance identifier
:return: py:class:`boto.ec2.instance.Reservation` - instance
:raises: `InstanceError` is returned if the instance can't
be found in the local cache or in the cloud.
"""
# if instance is known, return it
if instance_id in self._instances:
return self._instances[instance_id]
# else, check (cached) list from provider
if instance_id not in self._cached_instances:
self._cached_instances = self._build_cached_instances()
if instance_id in self._cached_instances:
inst = self._cached_instances[instance_id]
self._instances[instance_id] = inst
return inst
# If we reached this point, the instance was not found neither
# in the caches nor on the website.
raise InstanceNotFoundError(
"Instance `{instance_id}` not found".format(
instance_id=instance_id))
def stop_instance(self, instance_id):
"""Stops the instance gracefully.
:param str instance_id: instance identifier
:raises: `InstanceError` if instance can not be stopped
"""
if not instance_id:
log.info("Instance to stop has no instance id")
return
gce = self._connect()
try:
request = gce.instances().delete(project=self._project_id,
instance=instance_id,
zone=self._zone)
response = self._execute_request(request)
self._check_response(response)
except HttpError as e:
# If the instance does not exist, we get a 404
if e.resp.status == 404:
raise InstanceNotFoundError(
"Instance `{instance_id}` was not found".format(
instance_id=instance_id))
else:
raise InstanceError(
"Could not stop instance `{instance_id}`: `{e}`".format(
instance_id=instance_id, e=e))
except CloudProviderError as e:
raise InstanceError(
"Could not stop instance `{instance_id}`: `{e}`".format(
instance_id=instance_id, e=e))
def _get_vm(self, instance_id, force_reload=True):
"""
Return details on the VM with the given name.
:param str node_name: instance identifier
:param bool force_reload:
if ``True``, skip searching caches and reload instance from server
and immediately reload instance data from cloud provider
:return: py:class:`novaclient.v1_1.servers.Server` - instance
:raises: `InstanceError` is returned if the instance can't
be found in the local cache or in the cloud.
"""
self._init_az_api()
if force_reload:
# Remove from cache and get from server again
self._inventory = {}
cluster_name, node_name = instance_id
self._init_inventory(cluster_name)
# if instance is known, return it
if node_name not in self._vm_details:
vm_info = self._compute_client.virtual_machines.get(
cluster_name, node_name, 'instanceView')
self._vm_details[node_name] = vm_info
try:
return self._vm_details[node_name]
except KeyError:
raise InstanceNotFoundError(
"Instance `{instance_id}` not found"
.format(instance_id=instance_id))
