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Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from cfnlint._typing import RuleMatches
from cfnlint.rules import CloudFormationLintRule, RuleMatch
from cfnlint.template import Template
class CircularDependency(CloudFormationLintRule):
"""Check if Resources have a circular dependency"""
id = "E3004"
shortdesc = "Resource dependencies are not circular"
description = (
"Check that Resources are not circularly dependent by DependsOn, Ref, Sub, or"
" GetAtt"
)
source_url = "https://github.com/aws-cloudformation/cfn-lint"
tags = ["resources", "circularly", "dependson", "ref", "sub", "getatt"]
def match(self, cfn: Template) -> RuleMatches:
matches = []
if cfn.graph is None:
return []
for cycle in cfn.graph.get_cycles(cfn):
source, target = cycle[:2]
if (
cfn.graph.graph.nodes[source].get("type") == "Resource"
and cfn.graph.graph.nodes[target].get("type") == "Resource"
):
message = (
f"Circular Dependencies for resource {source}. Circular dependency"
f" with [{target}]"
)
path = ["Resources", source]
matches.append(RuleMatch(path, message))
return matches
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