def get_default_arch_image_in_nodegroup(self, nodegroup, series, purpose):
"""Return the first image available for any architecture in the
nodegroup/series supplied.
"""
images = BootImage.objects.filter(
release=series, nodegroup=nodegroup, purpose=purpose)
images = images.order_by('architecture')
return get_first(images)
def test_get_first_does_not_retrieve_beyond_first_item(self):
class SecondItemRetrieved(Exception):
"""Second item as retrieved. It shouldn't be."""
def multiple_items():
yield "Item 1"
raise SecondItemRetrieved()
self.assertEqual("Item 1", get_first(multiple_items()))
def test_get_first_does_not_retrieve_beyond_first_item(self):
class SecondItemRetrieved(Exception):
"""Second item as retrieved. It shouldn't be."""
def multiple_items():
yield "Item 1"
raise SecondItemRetrieved()
self.assertEqual("Item 1", get_first(multiple_items()))
def get_default_commissioning_resource(self, osystem, series):
"""Return best guess `BootResource` for the given osystem and series.
Prefers `i386` then `amd64` resources if available. Returns `None`
if none match requirements.
"""
commissionable = list(self.get_commissionable_resource(
osystem, series))
for resource in commissionable:
# Prefer i386. It will work for most cases where we don't
# know the actual architecture.
arch, subarch = resource.split_arch()
if arch == "i386":
return resource
for resource in commissionable:
# Prefer amd64. It has a much better chance of working than
# say arm or ppc.
arch, subarch = resource.split_arch()
if arch == "amd64":
return resource
return get_first(commissionable)
def acquire(self, request):
"""Acquire an available node for deployment.
Constraints parameters can be used to acquire a node that possesses
certain characteristics. All the constraints are optional and when
multiple constraints are provided, they are combined using 'AND'
semantics.
:param name: Hostname of the returned node.
:type name: unicode
:param arch: Architecture of the returned node (e.g. 'i386/generic',
'amd64', 'armhf/highbank', etc.).
:type arch: unicode
:param cpu_count: The minium number of CPUs the returned node must
have.
:type cpu_count: int
:param mem: The minimum amount of memory (expressed in MB) the
returned node must have.
:type mem: float
:param tags: List of tags the returned node must have.
:type tags: list of unicodes
:param not_tags: List of tags the acquired node must not have.
:type tags: List of unicodes.
:param connected_to: List of routers' MAC addresses the returned
node must be connected to.
:type connected_to: unicode or list of unicodes
:param networks: List of networks (defined in MAAS) to which the node
must be attached. A network can be identified by the name
assigned to it in MAAS; or by an `ip:` prefix followed by any IP
address that falls within the network; or a `vlan:` prefix
followed by a numeric VLAN tag, e.g. `vlan:23` for VLAN number 23.
Valid VLAN tags must be in the range of 1 to 4095 inclusive.
:type networks: list of unicodes
:param not_networks: List of networks (defined in MAAS) to which the
node must not be attached. The returned noded won't be attached to
any of the specified networks. A network can be identified by the
name assigned to it in MAAS; or by an `ip:` prefix followed by any
IP address that falls within the network; or a `vlan:` prefix
followed by a numeric VLAN tag, e.g. `vlan:23` for VLAN number 23.
Valid VLAN tags must be in the range of 1 to 4095 inclusive.
:type not_networks: list of unicodes
:param not_connected_to: List of routers' MAC Addresses the returned
node must not be connected to.
:type connected_to: list of unicodes
:param zone: An optional name for a physical zone the acquired
node should be located in.
:type zone: unicode
:type not_in_zone: Optional list of physical zones from which the
node should not be acquired.
:type not_in_zone: List of unicodes.
:param agent_name: An optional agent name to attach to the
acquired node.
:type agent_name: unicode
Returns 409 if a suitable node matching the constraints could not be
found.
"""
form = AcquireNodeForm(data=request.data)
maaslog.info(
"Request from user %s to acquire a node with constraints %s",
request.user.username, request.data)
if not form.is_valid():
raise ValidationError(form.errors)
# This lock prevents a node we've picked as available from
# becoming unavailable before our transaction commits.
with locks.node_acquire:
nodes = Node.objects.get_available_nodes_for_acquisition(
request.user)
nodes = form.filter_nodes(nodes)
node = get_first(nodes)
if node is None:
constraints = form.describe_constraints()
if constraints == '':
# No constraints. That means no nodes at all were
# available.
message = "No node available."
else:
message = (
"No available node matches constraints: %s"
% constraints)
raise NodesNotAvailable(message)
agent_name = request.data.get('agent_name', '')
node.acquire(
request.user, get_oauth_token(request),
agent_name=agent_name)
return node
def test_get_first_accepts_any_sequence(self):
item = factory.getRandomString()
self.assertEqual(item, get_first(repeat(item)))
def test_get_first_returns_first_item(self):
items = [factory.getRandomString() for counter in range(10)]
self.assertEqual(items[0], get_first(items))
def test_get_first_returns_None_for_empty_list(self):
self.assertIsNone(get_first([]))
def test_get_first_accepts_any_sequence(self):
item = factory.getRandomString()
self.assertEqual(item, get_first(repeat(item)))
def test_get_first_returns_first_item(self):
items = [factory.getRandomString() for counter in range(10)]
self.assertEqual(items[0], get_first(items))
def test_get_first_returns_None_for_empty_list(self):
self.assertIsNone(get_first([]))
