Implement get_template_summary

simonrw · simonrw · commit eb7ec6728e1c · 2025-06-22T22:36:19.000+01:00
At least an initial version that matches one test
diff --git a/localstack-core/localstack/services/cloudformation/v2/entities.py b/localstack-core/localstack/services/cloudformation/v2/entities.py
@@ -31,6 +31,7 @@
 
 
 class ResolvedResource(TypedDict):
+    Type: str
     Properties: dict
 
 
@@ -190,6 +191,9 @@ def describe_details(self) -> ApiStack:
             result["Outputs"] = describe_outputs
         return result
 
+    def is_active(self) -> bool:
+        return self.status != StackStatus.DELETE_COMPLETE
+
 
 class ChangeSetRequestPayload(TypedDict, total=False):
     ChangeSetName: str
diff --git a/localstack-core/localstack/services/cloudformation/v2/provider.py b/localstack-core/localstack/services/cloudformation/v2/provider.py
@@ -1,5 +1,6 @@
 import copy
 import logging
+from collections import defaultdict
 from datetime import datetime, timezone
 from typing import Any, Optional
 
@@ -23,6 +24,8 @@
     DisableRollback,
     ExecuteChangeSetOutput,
     ExecutionStatus,
+    GetTemplateSummaryInput,
+    GetTemplateSummaryOutput,
     IncludePropertyValues,
     InvalidChangeSetStatusException,
     LogicalResourceId,
@@ -208,9 +211,7 @@ def create_change_set(
             stack_candidates: list[Stack] = [
                 s for stack_arn, s in state.stacks_v2.items() if s.stack_name == stack_name
             ]
-            active_stack_candidates = [
-                s for s in stack_candidates if self._stack_status_is_active(s.status)
-            ]
+            active_stack_candidates = [s for s in stack_candidates if s.is_active()]
 
             # on a CREATE an empty Stack should be generated if we didn't find an active one
             if not active_stack_candidates and change_set_type == ChangeSetType.CREATE:
@@ -562,6 +563,38 @@ def describe_stack_events(
             raise StackNotFoundError(stack_name)
         return DescribeStackEventsOutput(StackEvents=stack.events)
 
+    @handler("GetTemplateSummary", expand=False)
+    def get_template_summary(
+        self,
+        context: RequestContext,
+        request: GetTemplateSummaryInput,
+    ) -> GetTemplateSummaryOutput:
+        state = get_cloudformation_store(context.account_id, context.region)
+        stack_name = request.get("StackName")
+        if not stack_name:
+            raise NotImplementedError("No stack name provided to get_template_summary")
+        stack = find_stack_v2(state, stack_name)
+        if not stack:
+            raise StackNotFoundError(stack_name)
+
+        id_summaries = defaultdict(list)
+        for resource_id, resource in stack.resolved_resources.items():
+            res_type = resource["Type"]
+            id_summaries[res_type].append(resource_id)
+
+        result = GetTemplateSummaryOutput(
+            # TODO parameters
+            Metadata=stack.template.get("Metadata"),
+            ResourceIdentifierSummaries=[
+                {"ResourceType": key, "LogicalResourceIds": values}
+                for key, values in id_summaries.items()
+            ],
+            ResourceTypes=list(id_summaries.keys()),
+            Version=stack.template.get("AWSTemplateFormatVersion", "2010-09-09"),
+        )
+
+        return result
+
     @handler("DeleteStack")
     def delete_stack(
         self,
diff --git a/tests/aws/services/cloudformation/v2/ported_from_v1/api/test_changesets.py b/tests/aws/services/cloudformation/v2/ported_from_v1/api/test_changesets.py
@@ -645,7 +645,6 @@ def test_create_and_then_remove_non_supported_resource_change_set(deploy_cfn_tem
     )
 
 
-@pytest.mark.skip("CFNV2:Other")
 @markers.aws.validated
 def test_create_and_then_update_refreshes_template_metadata(
     aws_client,
diff --git a/tests/aws/services/cloudformation/v2/ported_from_v1/api/test_templates.py b/tests/aws/services/cloudformation/v2/ported_from_v1/api/test_templates.py
@@ -17,7 +17,6 @@
 )
 
 
-@pytest.mark.skip(reason="CFNV2:Provider")
 @markers.aws.validated
 @markers.snapshot.skip_snapshot_verify(
     paths=["$..ResourceIdentifierSummaries..ResourceIdentifiers", "$..Parameters"]

Original file line number	Diff line number	Diff line change
`@@ -645,7 +645,6 @@ def test_create_and_then_remove_non_supported_resource_change_set(deploy_cfn_tem`
`645`	`645`	`)`
`646`	`646`
`647`	`647`
`648`		`-@pytest.mark.skip("CFNV2:Other")`
`649`	`648`	`@markers.aws.validated`
`650`	`649`	`def test_create_and_then_update_refreshes_template_metadata(`
`651`	`650`	`aws_client,`
Original file line number	Diff line number	Diff line change
`@@ -17,7 +17,6 @@`
`17`	`17`	`)`
`18`	`18`
`19`	`19`
`20`		`-@pytest.mark.skip(reason="CFNV2:Provider")`
`21`	`20`	`@markers.aws.validated`
`22`	`21`	`@markers.snapshot.skip_snapshot_verify(`
`23`	`22`	`paths=["$..ResourceIdentifierSummaries..ResourceIdentifiers", "$..Parameters"]`