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How to use latest_template_raw method in localstack

Best Python code snippet using localstack_python
cloudformation_api.py
Source:cloudformation_api.py
...161        return state162    def resource_status(self, resource_id: str):163        result = self._lookup(self.resource_states, resource_id)164        return result165    def latest_template_raw(self):166        if self.change_sets:167            return self.change_sets[-1]._template_raw168        return self._template_raw169    @property170    def resource_states(self):171        for resource_id in list(self._resource_states.keys()):172            self._set_resource_status_details(resource_id)173        return self._resource_states174    @property175    def stack_name(self):176        return self.metadata["StackName"]177    @property178    def stack_id(self):179        return self.metadata["StackId"]180    # TODO: potential performance issues due to many stack_parameters calls (cache or limit actual invocations)181    @property182    def resources(self):  # TODO: not actually resources, split apart183        """Return dict of resources, parameters, conditions, and other stack metadata."""184        result = dict(self.template_resources)185        def add_params(defaults=True):186            for param in self.stack_parameters(defaults=defaults):187                if param["ParameterKey"] not in result:188                    resolved_value = param.get("ResolvedValue")189                    result[param["ParameterKey"]] = {190                        "Type": "Parameter",191                        "LogicalResourceId": param["ParameterKey"],192                        "Properties": {193                            "Value": (194                                resolved_value195                                if resolved_value is not None196                                else param["ParameterValue"]197                            )198                        },199                    }200        add_params(defaults=False)201        # TODO: conditions and mappings don't really belong here and should be handled separately202        for name, value in self.conditions.items():203            if name not in result:204                result[name] = {205                    "Type": "Parameter",206                    "LogicalResourceId": name,207                    "Properties": {"Value": value},208                }209        for name, value in self.mappings.items():210            if name not in result:211                result[name] = {212                    "Type": "Parameter",213                    "LogicalResourceId": name,214                    "Properties": {"Value": value},215                }216        add_params(defaults=True)217        return result218    @property219    def template_resources(self):220        return self.template.setdefault("Resources", {})221    @property222    def tags(self):223        return aws_responses.extract_tags(self.metadata)224    @property225    def imports(self):226        def _collect(o, **kwargs):227            if isinstance(o, dict):228                import_val = o.get("Fn::ImportValue")229                if import_val:230                    result.add(import_val)231            return o232        result = set()233        recurse_object(self.resources, _collect)234        return result235    def outputs_list(self) -> List[Dict]:236        """Returns a copy of the outputs of this stack."""237        result = []238        for k, details in self.outputs.items():239            value = None240            try:241                template_deployer.resolve_refs_recursively(self, details)242                value = details["Value"]243            except Exception as e:244                LOG.debug("Unable to resolve references in stack outputs: %s - %s", details, e)245            exports = details.get("Export") or {}246            export = exports.get("Name")247            export = template_deployer.resolve_refs_recursively(self, export)248            description = details.get("Description")249            entry = {250                "OutputKey": k,251                "OutputValue": value,252                "Description": description,253                "ExportName": export,254            }255            result.append(entry)256        return result257    # TODO: check if metadata already populated/resolved and use it if possible (avoid unnecessary re-resolving)258    def stack_parameters(self, defaults=True) -> List[Dict[str, Any]]:259        result = {}260        # add default template parameter values261        if defaults:262            for key, value in self.template_parameters.items():263                param_value = value.get("Default")264                result[key] = {265                    "ParameterKey": key,266                    "ParameterValue": param_value,267                }268                # TODO: extract dynamic parameter resolving269                # TODO: support different types and refactor logic to use metadata (here not yet populated properly)270                param_type = value.get("Type", "")271                if not is_none_or_empty(param_type):272                    if param_type == "AWS::SSM::Parameter::Value<String>":273                        ssm_client = aws_stack.connect_to_service("ssm")274                        resolved_value = ssm_client.get_parameter(Name=param_value)["Parameter"][275                            "Value"276                        ]277                        result[key]["ResolvedValue"] = resolved_value278                    elif param_type.startswith("AWS::"):279                        LOG.info(280                            f"Parameter Type '{param_type}' is currently not supported. Coming soon, stay tuned!"281                        )282                    else:283                        # lets assume we support the normal CFn parameters284                        pass285        # add stack parameters286        result.update({p["ParameterKey"]: p for p in self.metadata["Parameters"]})287        # add parameters of change sets288        for change_set in self.change_sets:289            result.update({p["ParameterKey"]: p for p in change_set.metadata["Parameters"]})290        result = list(result.values())291        return result292    @property293    def template_parameters(self):294        return self.template["Parameters"]295    @property296    def conditions(self):297        """Returns the (mutable) dict of stack conditions."""298        return self.template.setdefault("Conditions", {})299    @property300    def mappings(self):301        """Returns the (mutable) dict of stack mappings."""302        return self.template.setdefault("Mappings", {})303    @property304    def outputs(self):305        """Returns the (mutable) dict of stack outputs."""306        return self.template.setdefault("Outputs", {})307    @property308    def exports_map(self):309        result = {}310        for export in CloudFormationRegion.get().exports:311            result[export["Name"]] = export312        return result313    @property314    def nested_stacks(self):315        """Return a list of nested stacks that have been deployed by this stack."""316        result = [317            r for r in self.template_resources.values() if r["Type"] == "AWS::CloudFormation::Stack"318        ]319        result = [find_stack(r["Properties"].get("StackName")) for r in result]320        result = [r for r in result if r]321        return result322    @property323    def status(self):324        return self.metadata["StackStatus"]325    @property326    def resource_types(self):327        return [r.get("Type") for r in self.template_resources.values()]328    def resource(self, resource_id):329        return self._lookup(self.resources, resource_id)330    def _lookup(self, resource_map, resource_id):331        resource = resource_map.get(resource_id)332        if not resource:333            raise Exception(334                'Unable to find details for resource "%s" in stack "%s"'335                % (resource_id, self.stack_name)336            )337        return resource338    def copy(self):339        return Stack(metadata=dict(self.metadata), template=dict(self.template))340class StackChangeSet(Stack):341    def __init__(self, params=None, template=None):342        if template is None:343            template = {}344        if params is None:345            params = {}346        super(StackChangeSet, self).__init__(params, template)347        name = self.metadata["ChangeSetName"]348        if not self.metadata.get("ChangeSetId"):349            self.metadata["ChangeSetId"] = aws_stack.cf_change_set_arn(350                name, change_set_id=short_uid()351            )352        stack = self.stack = find_stack(self.metadata["StackName"])353        self.metadata["StackId"] = stack.stack_id354        self.metadata["Status"] = "CREATE_PENDING"355    @property356    def change_set_id(self):357        return self.metadata["ChangeSetId"]358    @property359    def change_set_name(self):360        return self.metadata["ChangeSetName"]361    @property362    def resources(self):363        result = dict(self.stack.resources)364        result.update(self.resources)365        return result366    @property367    def changes(self):368        result = self.metadata["Changes"] = self.metadata.get("Changes", [])369        return result370class CloudFormationRegion(RegionBackend):371    def __init__(self):372        # maps stack ID to stack details373        self.stacks: Dict[str, Stack] = {}374        # maps stack set ID to stack set details375        self.stack_sets: Dict[str, StackSet] = {}376    @property377    def exports(self):378        exports = []379        output_keys = {}380        for stack_id, stack in self.stacks.items():381            for output in stack.outputs_list():382                export_name = output.get("ExportName")383                if not export_name:384                    continue385                if export_name in output_keys:386                    # TODO: raise exception on stack creation in case of duplicate exports387                    LOG.warning(388                        "Found duplicate export name %s in stacks: %s %s",389                        export_name,390                        output_keys[export_name],391                        stack.stack_id,392                    )393                entry = {394                    "ExportingStackId": stack.stack_id,395                    "Name": export_name,396                    "Value": output["OutputValue"],397                }398                exports.append(entry)399                output_keys[export_name] = stack.stack_id400        return exports401# --------------402# API ENDPOINTS403# --------------404def create_stack(req_params):405    state = CloudFormationRegion.get()406    template_deployer.prepare_template_body(req_params)  # TODO: avoid mutating req_params directly407    template = template_preparer.parse_template(req_params["TemplateBody"])408    stack_name = template["StackName"] = req_params.get("StackName")409    stack = Stack(req_params, template)410    # find existing stack with same name, and remove it if this stack is in DELETED state411    existing = ([s for s in state.stacks.values() if s.stack_name == stack_name] or [None])[0]412    if existing:413        if "DELETE" not in existing.status:414            return error_response(415                'Stack named "%s" already exists with status "%s"' % (stack_name, existing.status),416                code=400,417                code_string="ValidationError",418            )419        state.stacks.pop(existing.stack_id)420    state.stacks[stack.stack_id] = stack421    LOG.debug(422        'Creating stack "%s" with %s resources ...', stack.stack_name, len(stack.template_resources)423    )424    deployer = template_deployer.TemplateDeployer(stack)425    try:426        # TODO: create separate step to first resolve parameters427        deployer.deploy_stack()428    except Exception as e:429        stack.set_stack_status("CREATE_FAILED")430        msg = 'Unable to create stack "%s": %s' % (stack.stack_name, e)431        LOG.debug("%s %s", msg, traceback.format_exc())432        return error_response(msg, code=400, code_string="ValidationError")433    result = {"StackId": stack.stack_id}434    return result435def create_stack_set(req_params):436    state = CloudFormationRegion.get()437    stack_set = StackSet(req_params)438    stack_set_id = short_uid()439    stack_set.metadata["StackSetId"] = stack_set_id440    state.stack_sets[stack_set_id] = stack_set441    result = {"StackSetId": stack_set_id}442    return result443def create_stack_instances(req_params):444    state = CloudFormationRegion.get()445    set_name = req_params.get("StackSetName")446    stack_set = [sset for sset in state.stack_sets.values() if sset.stack_set_name == set_name]447    if not stack_set:448        return not_found_error('Stack set named "%s" does not exist' % set_name)449    stack_set = stack_set[0]450    op_id = req_params.get("OperationId") or short_uid()451    sset_meta = stack_set.metadata452    accounts = extract_url_encoded_param_list(req_params, "Accounts.member.%s")453    accounts = accounts or extract_url_encoded_param_list(454        req_params, "DeploymentTargets.Accounts.member.%s"455    )456    regions = extract_url_encoded_param_list(req_params, "Regions.member.%s")457    stacks_to_await = []458    for account in accounts:459        for region in regions:460            # deploy new stack461            LOG.debug('Deploying instance for stack set "%s" in region "%s"', set_name, region)462            cf_client = aws_stack.connect_to_service("cloudformation", region_name=region)463            kwargs = select_attributes(sset_meta, "TemplateBody") or select_attributes(464                sset_meta, "TemplateURL"465            )466            stack_name = "sset-%s-%s" % (set_name, account)467            result = cf_client.create_stack(StackName=stack_name, **kwargs)468            stacks_to_await.append((stack_name, region))469            # store stack instance470            instance = {471                "StackSetId": sset_meta["StackSetId"],472                "OperationId": op_id,473                "Account": account,474                "Region": region,475                "StackId": result["StackId"],476                "Status": "CURRENT",477                "StackInstanceStatus": {"DetailedStatus": "SUCCEEDED"},478            }479            instance = StackInstance(instance)480            stack_set.stack_instances.append(instance)481    # wait for completion of stack482    for stack in stacks_to_await:483        aws_stack.await_stack_completion(stack[0], region_name=stack[1])484    # record operation485    operation = {486        "OperationId": op_id,487        "StackSetId": stack_set.metadata["StackSetId"],488        "Action": "CREATE",489        "Status": "SUCCEEDED",490    }491    stack_set.operations[op_id] = operation492    result = {"OperationId": op_id}493    return result494def delete_stack(req_params):495    stack_name = req_params.get("StackName")496    stack = find_stack(stack_name)497    deployer = template_deployer.TemplateDeployer(stack)498    deployer.delete_stack()499    return {}500def delete_stack_set(req_params):501    state = CloudFormationRegion.get()502    set_name = req_params.get("StackSetName")503    stack_set = [sset for sset in state.stack_sets.values() if sset.stack_set_name == set_name]504    if not stack_set:505        return not_found_error('Stack set named "%s" does not exist' % set_name)506    for instance in stack_set[0].stack_instances:507        deployer = template_deployer.TemplateDeployer(instance.stack)508        deployer.delete_stack()509    return {}510def update_stack(req_params):511    stack_name = req_params.get("StackName")512    stack = find_stack(stack_name)513    if not stack:514        return not_found_error('Unable to update non-existing stack "%s"' % stack_name)515    template_preparer.prepare_template_body(req_params)516    template = template_preparer.parse_template(req_params["TemplateBody"])517    new_stack = Stack(req_params, template)518    deployer = template_deployer.TemplateDeployer(stack)519    try:520        deployer.update_stack(new_stack)521    except Exception as e:522        stack.set_stack_status("UPDATE_FAILED")523        msg = 'Unable to update stack "%s": %s' % (stack_name, e)524        LOG.debug("%s %s", msg, traceback.format_exc())525        return error_response(msg, code=400, code_string="ValidationError")526    result = {"StackId": stack.stack_id}527    return result528def update_stack_set(req_params):529    state = CloudFormationRegion.get()530    set_name = req_params.get("StackSetName")531    stack_set = [sset for sset in state.stack_sets.values() if sset.stack_set_name == set_name]532    if not stack_set:533        return not_found_error('Stack set named "%s" does not exist' % set_name)534    stack_set = stack_set[0]535    stack_set.metadata.update(req_params)536    op_id = req_params.get("OperationId") or short_uid()537    operation = {538        "OperationId": op_id,539        "StackSetId": stack_set.metadata["StackSetId"],540        "Action": "UPDATE",541        "Status": "SUCCEEDED",542    }543    stack_set.operations[op_id] = operation544    return {"OperationId": op_id}545def describe_stacks(req_params):546    state = CloudFormationRegion.get()547    stack_name = req_params.get("StackName")548    stack_list = list(state.stacks.values())549    stacks = [550        s.describe_details() for s in stack_list if stack_name in [None, s.stack_name, s.stack_id]551    ]552    if stack_name and not stacks:553        return error_response(554            "Stack with id %s does not exist" % stack_name,555            code=400,556            code_string="ValidationError",557        )558    result = {"Stacks": stacks}559    return result560def list_stacks(req_params):561    state = CloudFormationRegion.get()562    stack_status_filters = _get_status_filter_members(req_params)563    stacks = [564        s.describe_details()565        for s in state.stacks.values()566        if not stack_status_filters or s.status in stack_status_filters567    ]568    attrs = [569        "StackId",570        "StackName",571        "TemplateDescription",572        "CreationTime",573        "LastUpdatedTime",574        "DeletionTime",575        "StackStatus",576        "StackStatusReason",577        "ParentId",578        "RootId",579        "DriftInformation",580    ]581    stacks = [select_attributes(stack, attrs) for stack in stacks]582    result = {"StackSummaries": stacks}583    return result584def describe_stack_resource(req_params):585    stack_name = req_params.get("StackName")586    resource_id = req_params.get("LogicalResourceId")587    stack = find_stack(stack_name)588    if not stack:589        return stack_not_found_error(stack_name)590    details = stack.resource_status(resource_id)591    result = {"StackResourceDetail": details}592    return result593def describe_stack_resources(req_params):594    stack_name = req_params.get("StackName")595    resource_id = req_params.get("LogicalResourceId")596    phys_resource_id = req_params.get("PhysicalResourceId")597    if phys_resource_id and stack_name:598        return error_response("Cannot specify both StackName and PhysicalResourceId", code=400)599    # TODO: filter stack by PhysicalResourceId!600    stack = find_stack(stack_name)601    if not stack:602        return stack_not_found_error(stack_name)603    statuses = [604        res_status605        for res_id, res_status in stack.resource_states.items()606        if resource_id in [res_id, None]607    ]608    return {"StackResources": statuses}609def list_stack_resources(req_params):610    result = describe_stack_resources(req_params)611    if not isinstance(result, dict):612        return result613    result = {"StackResourceSummaries": result.pop("StackResources")}614    return result615def list_stack_instances(req_params):616    state = CloudFormationRegion.get()617    set_name = req_params.get("StackSetName")618    stack_set = [sset for sset in state.stack_sets.values() if sset.stack_set_name == set_name]619    if not stack_set:620        return not_found_error('Stack set named "%s" does not exist' % set_name)621    stack_set = stack_set[0]622    result = [inst.metadata for inst in stack_set.stack_instances]623    result = {"Summaries": result}624    return result625ChangeSetTypes = Literal["CREATE", "UPDATE", "IMPORT"]626def create_change_set(req_params: Dict[str, Any]):627    change_set_type: ChangeSetTypes = req_params.get("ChangeSetType", "UPDATE")628    stack_name: Optional[str] = req_params.get("StackName")629    change_set_name: Optional[str] = req_params.get("ChangeSetName")630    template_body: Optional[str] = req_params.get("TemplateBody")631    # s3 or secretsmanager url632    template_url: Optional[str] = req_params.get("TemplateUrl") or req_params.get("TemplateURL")633    if is_none_or_empty(change_set_name):634        return error_response(635            "ChangeSetName required", 400, "ValidationError"636        )  # TODO: check proper message637    if is_none_or_empty(stack_name):638        return error_response(639            "StackName required", 400, "ValidationError"640        )  # TODO: check proper message641    stack: Optional[Stack] = find_stack(stack_name)642    # validate and resolve template643    if template_body and template_url:644        return error_response(645            "Specify exactly one of 'TemplateBody' or 'TemplateUrl'", 400, "ValidationError"646        )  # TODO: check proper message647    if not template_body and not template_url:648        return error_response(649            "Specify exactly one of 'TemplateBody' or 'TemplateUrl'", 400, "ValidationError"650        )  # TODO: check proper message651    prepare_template_body(req_params)  # TODO: function has too many unclear responsibilities652    template = template_preparer.parse_template(req_params["TemplateBody"])653    del req_params["TemplateBody"]  # TODO: stop mutating req_params654    template["StackName"] = stack_name655    template[656        "ChangeSetName"657    ] = change_set_name  # TODO: validate with AWS what this is actually doing?658    if change_set_type == "UPDATE":659        # add changeset to existing stack660        if stack is None:661            return error_response(662                f"Stack '{stack_name}' does not exist.", 400, "ValidationError"663            )  # stack should exist already664    elif change_set_type == "CREATE":665        # create new (empty) stack666        if stack is not None:667            return error_response(668                f"Stack {stack_name} already exists", 400, "ValidationError"669            )  # stack should not exist yet (TODO: check proper message)670        state = CloudFormationRegion.get()671        empty_stack_template = dict(template)672        empty_stack_template["Resources"] = {}673        req_params_copy = clone_stack_params(req_params)674        stack = Stack(req_params_copy, empty_stack_template)675        state.stacks[stack.stack_id] = stack676        stack.set_stack_status("REVIEW_IN_PROGRESS")677    elif change_set_type == "IMPORT":678        raise NotImplementedError()  # TODO: implement importing resources679    else:680        msg = f"1 validation error detected: Value '{change_set_type}' at 'changeSetType' failed to satisfy constraint: Member must satisfy enum value set: [IMPORT, UPDATE, CREATE]"681        return error_response(msg, code=400, code_string="ValidationError")682    change_set = StackChangeSet(req_params, template)683    # TODO: refactor the flow here684    deployer = template_deployer.TemplateDeployer(change_set)685    deployer.construct_changes(686        stack,687        change_set,688        change_set_id=change_set.change_set_id,689        append_to_changeset=True,690    )  # TODO: ignores return value (?)691    deployer.apply_parameter_changes(change_set, change_set)  # TODO: bandaid to populate metadata692    stack.change_sets.append(change_set)693    change_set.metadata[694        "Status"695    ] = "CREATE_COMPLETE"  # technically for some time this should first be CREATE_PENDING696    change_set.metadata[697        "ExecutionStatus"698    ] = "AVAILABLE"  # technically for some time this should first be UNAVAILABLE699    return {"StackId": change_set.stack_id, "Id": change_set.change_set_id}700def execute_change_set(req_params):701    stack_name = req_params.get("StackName")702    cs_name = req_params.get("ChangeSetName")703    change_set = find_change_set(cs_name, stack_name=stack_name)704    if not change_set:705        return not_found_error(706            'Unable to find change set "%s" for stack "%s"' % (cs_name, stack_name)707        )708    LOG.debug(709        'Executing change set "%s" for stack "%s" with %s resources ...',710        cs_name,711        stack_name,712        len(change_set.template_resources),713    )714    deployer = template_deployer.TemplateDeployer(change_set.stack)715    deployer.apply_change_set(change_set)716    change_set.stack.metadata["ChangeSetId"] = change_set.change_set_id717    return {}718def list_change_sets(req_params):719    stack_name = req_params.get("StackName")720    stack = find_stack(stack_name)721    if not stack:722        return not_found_error('Unable to find stack "%s"' % stack_name)723    result = [cs.metadata for cs in stack.change_sets]724    result = {"Summaries": result}725    return result726def list_stack_sets(req_params):727    state = CloudFormationRegion.get()728    result = [sset.metadata for sset in state.stack_sets.values()]729    result = {"Summaries": result}730    return result731def describe_change_set(req_params):732    stack_name = req_params.get("StackName")733    cs_name = req_params.get("ChangeSetName")734    change_set: Optional[StackChangeSet] = find_change_set(cs_name, stack_name=stack_name)735    if not change_set:736        return not_found_error(737            'Unable to find change set "%s" for stack "%s"' % (cs_name, stack_name)738        )739    return change_set.metadata740def describe_stack_set(req_params):741    state = CloudFormationRegion.get()742    set_name = req_params.get("StackSetName")743    result = [744        sset.metadata for sset in state.stack_sets.values() if sset.stack_set_name == set_name745    ]746    if not result:747        return not_found_error('Unable to find stack set "%s"' % set_name)748    result = {"StackSet": result[0]}749    return result750def describe_stack_set_operation(req_params):751    state = CloudFormationRegion.get()752    set_name = req_params.get("StackSetName")753    stack_set = [sset for sset in state.stack_sets.values() if sset.stack_set_name == set_name]754    if not stack_set:755        return not_found_error('Unable to find stack set "%s"' % set_name)756    stack_set = stack_set[0]757    op_id = req_params.get("OperationId")758    result = stack_set.operations.get(op_id)759    if not result:760        LOG.debug(761            'Unable to find operation ID "%s" for stack set "%s" in list: %s',762            op_id,763            set_name,764            list(stack_set.operations.keys()),765        )766        return not_found_error(767            'Unable to find operation ID "%s" for stack set "%s"' % (op_id, set_name)768        )769    result = {"StackSetOperation": result}770    return result771def list_exports(req_params):772    state = CloudFormationRegion.get()773    result = {"Exports": state.exports}774    return result775def list_imports(req_params):776    state = CloudFormationRegion.get()777    export_name = req_params.get("ExportName")778    importing_stack_names = []779    for stack in state.stacks.values():780        if export_name in stack.imports:781            importing_stack_names.append(stack.stack_name)782    result = {"Imports": importing_stack_names}783    return result784def validate_template(req_params):785    try:786        result = template_preparer.validate_template(req_params)787        result = "<tmp>%s</tmp>" % result788        result = xmltodict.parse(result)["tmp"]789        return result790    except Exception as err:791        return error_response("Template Validation Error: %s" % err)792def describe_stack_events(req_params):793    stack_name = req_params.get("StackName")794    state = CloudFormationRegion.get()795    events = []796    for stack_id, stack in state.stacks.items():797        if stack_name in [None, stack.stack_name, stack.stack_id]:798            events.extend(stack.events)799    return {"StackEvents": events}800def delete_change_set(req_params):801    stack_name = req_params.get("StackName")802    cs_name = req_params.get("ChangeSetName")803    change_set = find_change_set(cs_name, stack_name=stack_name)804    if not change_set:805        return not_found_error(806            'Unable to find change set "%s" for stack "%s"' % (cs_name, stack_name)807        )808    change_set.stack.change_sets = [809        cs for cs in change_set.stack.change_sets if cs.change_set_name != cs_name810    ]811    return {}812def get_template(req_params):813    stack_name = req_params.get("StackName")814    cs_name = req_params.get("ChangeSetName")815    stack = find_stack(stack_name)816    if cs_name:817        stack = find_change_set(stack_name=stack_name, cs_name=cs_name)818    if not stack:819        return stack_not_found_error(stack_name)820    result = {"TemplateBody": json.dumps(stack.latest_template_raw())}821    return result822def get_template_summary(req_params):823    stack_name = req_params.get("StackName")824    stack = None825    if stack_name:826        stack = find_stack(stack_name)827        if not stack:828            return stack_not_found_error(stack_name)829    else:830        template_deployer.prepare_template_body(req_params)831        template = template_preparer.parse_template(req_params["TemplateBody"])832        req_params["StackName"] = "tmp-stack"833        stack = Stack(req_params, template)834    result = stack.describe_details()...
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