def as_effect(self):
"""Produce a :obj:`Effect` to set a metadata item on a server"""
eff = set_nova_metadata_item(server_id=self.server_id,
key=self.key,
value=self.value)
return eff.on(success=lambda _: (StepResult.SUCCESS, []))
def convergence_remove_server_from_group(log, transaction_id, server_id,
replace, purge, group, state):
"""
Remove a specific server from the group, optionally decrementing the
desired capacity.
The server may just be scheduled for deletion, or it may be evicted from
the group by removing otter-specific metdata from the server.
:param log: A bound logger
:param bytes trans_id: The transaction id for this operation.
:param bytes server_id: The id of the server to be removed.
:param bool replace: Should the server be replaced?
:param bool purge: Should the server be deleted from Nova?
:param group: The scaling group to remove a server from.
:type group: :class:`~otter.models.interface.IScalingGroup`
:param state: The current state of the group.
:type state: :class:`~otter.models.interface.GroupState`
:return: The updated state.
:rtype: Effect of :class:`~otter.models.interface.GroupState`
:raise: :class:`CannotDeleteServerBelowMinError` if the server cannot
be deleted without replacement, and :class:`ServerNotFoundError` if
there is no such server to be deleted.
"""
effects = [_is_server_in_group(group, server_id)]
if not replace:
effects.append(_can_scale_down(group, server_id))
# the (possibly) two checks can happen in parallel, but we want
# ServerNotFoundError to take precedence over
# CannotDeleteServerBelowMinError
both_checks = yield parallel_all_errors(effects)
for is_error, result in both_checks:
if is_error:
reraise(*result)
# Remove the server
if purge:
eff = set_nova_metadata_item(server_id, *DRAINING_METADATA)
else:
eff = Effect(
EvictServerFromScalingGroup(log=log,
transaction_id=transaction_id,
scaling_group=group,
server_id=server_id))
yield Effect(
TenantScope(
retry_effect(eff, retry_times(3), exponential_backoff_interval(2)),
group.tenant_id))
if not replace:
yield do_return(assoc_obj(state, desired=state.desired - 1))
else:
yield do_return(state)
def convergence_remove_server_from_group(
log, transaction_id, server_id, replace, purge, group, state):
"""
Remove a specific server from the group, optionally decrementing the
desired capacity.
The server may just be scheduled for deletion, or it may be evicted from
the group by removing otter-specific metdata from the server.
:param log: A bound logger
:param bytes trans_id: The transaction id for this operation.
:param bytes server_id: The id of the server to be removed.
:param bool replace: Should the server be replaced?
:param bool purge: Should the server be deleted from Nova?
:param group: The scaling group to remove a server from.
:type group: :class:`~otter.models.interface.IScalingGroup`
:param state: The current state of the group.
:type state: :class:`~otter.models.interface.GroupState`
:return: The updated state.
:rtype: Effect of :class:`~otter.models.interface.GroupState`
:raise: :class:`CannotDeleteServerBelowMinError` if the server cannot
be deleted without replacement, and :class:`ServerNotFoundError` if
there is no such server to be deleted.
"""
effects = [_is_server_in_group(group, server_id)]
if not replace:
effects.append(_can_scale_down(group, server_id))
# the (possibly) two checks can happen in parallel, but we want
# ServerNotFoundError to take precedence over
# CannotDeleteServerBelowMinError
both_checks = yield parallel_all_errors(effects)
for is_error, result in both_checks:
if is_error:
reraise(*result)
# Remove the server
if purge:
eff = set_nova_metadata_item(server_id, *DRAINING_METADATA)
else:
eff = Effect(
EvictServerFromScalingGroup(log=log,
transaction_id=transaction_id,
scaling_group=group,
server_id=server_id))
yield Effect(TenantScope(
retry_effect(eff, retry_times(3), exponential_backoff_interval(2)),
group.tenant_id))
if not replace:
yield do_return(assoc_obj(state, desired=state.desired - 1))
else:
yield do_return(state)
def _setup_for_set_nova_metadata_item(self):
"""
Produce the data needed to test :obj:`set_nova_metadata_item`: a tuple
of (server_id, expected_effect, real_effect)
"""
server_id = unicode(uuid4())
real = set_nova_metadata_item(server_id=server_id, key='k', value='v')
expected = service_request(
ServiceType.CLOUD_SERVERS,
'PUT',
'servers/{0}/metadata/k'.format(server_id),
data={'meta': {'k': 'v'}},
reauth_codes=(401,),
success_pred=has_code(200))
return (server_id, expected, real)
def _setup_for_set_nova_metadata_item(self):
"""
Produce the data needed to test :obj:`set_nova_metadata_item`: a tuple
of (server_id, expected_effect, real_effect)
"""
server_id = unicode(uuid4())
real = set_nova_metadata_item(server_id=server_id, key='k', value='v')
expected = service_request(ServiceType.CLOUD_SERVERS,
'PUT',
'servers/{0}/metadata/k'.format(server_id),
data={'meta': {
'k': 'v'
}},
reauth_codes=(401, ),
success_pred=has_code(200))
return (server_id, expected, real)
def as_effect(self):
"""Produce a :obj:`Effect` to set a metadata item on a server"""
eff = set_nova_metadata_item(
server_id=self.server_id, key=self.key, value=self.value)
return eff.on(success=lambda _: (StepResult.SUCCESS, []))
