heat.common.grouputils

Source code for heat.common.grouputils

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from heat.common import exception
from heat.common.i18n import _
from heat.engine import status
from heat.engine import template
from heat.rpc import api as rpc_api


[docs]class GroupInspector(object): """A class for returning data about a scaling group. All data is fetched over RPC, and the group's stack is never loaded into memory locally. Data is cached so it will be fetched only once. To refresh the data, create a new GroupInspector. """ def __init__(self, context, rpc_client, group_identity): """Initialise with a context, rpc_client, and stack identifier.""" self._context = context self._rpc_client = rpc_client self._identity = group_identity self._member_data = None self._template_data = None
[docs] @classmethod def from_parent_resource(cls, parent_resource): """Create a GroupInspector from a parent resource. This is a convenience method to instantiate a GroupInspector from a Heat StackResource object. """ return cls(parent_resource.context, parent_resource.rpc_client(), parent_resource.nested_identifier())
def _get_member_data(self): if self._identity is None: return [] if self._member_data is None: rsrcs = self._rpc_client.list_stack_resources(self._context, dict(self._identity)) def sort_key(r): return (r[rpc_api.RES_STATUS] != status.ResourceStatus.FAILED, r[rpc_api.RES_CREATION_TIME], r[rpc_api.RES_NAME]) self._member_data = sorted(rsrcs, key=sort_key) return self._member_data def _members(self, include_failed): return (r for r in self._get_member_data() if (include_failed or r[rpc_api.RES_STATUS] != status.ResourceStatus.FAILED))
[docs] def size(self, include_failed): """Return the size of the group. If include_failed is False, only members not in a FAILED state will be counted. """ return sum(1 for m in self._members(include_failed))
[docs] def member_names(self, include_failed): """Return an iterator over the names of the group members If include_failed is False, only members not in a FAILED state will be included. """ return (m[rpc_api.RES_NAME] for m in self._members(include_failed))
def _get_template_data(self): if self._identity is None: return None if self._template_data is None: self._template_data = self._rpc_client.get_template(self._context, self._identity) return self._template_data
[docs] def template(self): """Return a Template object representing the group's current template. Note that this does *not* include any environment data. """ data = self._get_template_data() if data is None: return None return template.Template(data)
[docs]def get_size(group, include_failed=False): """Get number of member resources managed by the specified group. The size excludes failed members by default; set include_failed=True to get the total size. """ return GroupInspector.from_parent_resource(group).size(include_failed)
[docs]def get_members(group, include_failed=False): """Get a list of member resources managed by the specified group. Sort the list of instances first by created_time then by name. If include_failed is set, failed members will be put first in the list sorted by created_time then by name. """ resources = [] if group.nested(): resources = [r for r in group.nested().values() if include_failed or r.status != r.FAILED] return sorted(resources, key=lambda r: (r.status != r.FAILED, r.created_time, r.name))
[docs]def get_member_refids(group): """Get a list of member resources managed by the specified group. The list of resources is sorted first by created_time then by name. """ return [r.FnGetRefId() for r in get_members(group)]
[docs]def get_member_names(group): """Get a list of resource names of the resources in the specified group. Failed resources will be ignored. """ inspector = GroupInspector.from_parent_resource(group) return list(inspector.member_names(include_failed=False))
[docs]def get_resource(stack, resource_name, use_indices, key=None): nested_stack = stack.nested() if not nested_stack: return None try: if use_indices: return get_members(stack)[int(resource_name)] else: return nested_stack[resource_name] except (IndexError, KeyError): raise exception.NotFound(_("Member '%(mem)s' not found " "in group resource '%(grp)s'.") % {'mem': resource_name, 'grp': stack.name})
[docs]def get_rsrc_attr(stack, key, use_indices, resource_name, *attr_path): resource = get_resource(stack, resource_name, use_indices) if resource: return resource.FnGetAtt(*attr_path)
[docs]def get_rsrc_id(stack, key, use_indices, resource_name): resource = get_resource(stack, resource_name, use_indices) if resource: return resource.FnGetRefId()
[docs]def get_nested_attrs(stack, key, use_indices, *path): path = key.split(".", 2)[1:] + list(path) if len(path) > 1: return get_rsrc_attr(stack, key, use_indices, *path) else: return get_rsrc_id(stack, key, use_indices, *path)
[docs]def get_member_definitions(group, include_failed=False): """Get member definitions in (name, ResourceDefinition) pair for group. The List is sorted first by created_time then by name. If include_failed is set, failed members will be put first in the List sorted by created_time then by name. """ inspector = GroupInspector.from_parent_resource(group) template = inspector.template() if template is None: return [] definitions = template.resource_definitions(None) return [(name, definitions[name]) for name in inspector.member_names(include_failed=include_failed) if name in definitions]
[docs]def get_child_template_files(context, stack, is_rolling_update, old_template_id): """Return a merged map of old and new template files. For rolling update files for old and new defintions are required as the nested stack is updated in batches of scaled units. """ if not stack.convergence: old_template_id = stack.t.id if is_rolling_update and old_template_id: prev_files = template.Template.load(context, old_template_id).files prev_files.update(dict(stack.t.files)) return prev_files return stack.t.files
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