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"""
Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
SPDX-License-Identifier: MIT-0
"""
from cfnlint.rules import CloudFormationLintRule, RuleMatch


class RuleTargetsLimit(CloudFormationLintRule):
    """Check State Machine Definition"""

    id = "E3021"
    shortdesc = "Check Events Rule Targets are less than or equal to 5"
    description = "CloudWatch Events Rule can only support up to 5 targets"
    source_url = "https://docs.aws.amazon.com/AmazonCloudWatch/latest/events/cloudwatch_limits_cwe.html"
    tags = ["resources", "events"]
    max_count = 5

    def __init__(self):
        """Init"""
        super().__init__()
        self.resource_property_types = ["AWS::Events::Rule"]
        self.limits = {}

    def initialize(self, cfn):
        self.limits = {}

    # pylint: disable=W0613
    def check_value(self, value, path):
        """Count them up"""

        resource_name = path[1]
        if len(path) > 4:
            if path[4] == "Fn::If":
                resource_name = f"{path[1]}.{path[5]}"

        if resource_name not in self.limits:
            self.limits[resource_name] = {"count": 0, "path": path[:-1]}

        self.limits[resource_name]["count"] += 1
        return []

    def match_resource_properties(self, properties, _, path, cfn):
        """Check CloudFormation Properties"""
        matches = []
        matches.extend(
            cfn.check_value(
                obj=properties,
                key="Targets",
                path=path[:],
                check_value=self.check_value,
            )
        )

        for _, limit in self.limits.items():
            if limit["count"] > self.max_count:
                message = "An Events Rule can have up to {0} Targets"
                matches.append(RuleMatch(limit["path"], message.format(self.max_count)))

        return matches

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
RuleScheduleExpression.py File 4.02 KB 0644
RuleTargetsLimit.py File 1.81 KB 0644
__init__.py File 106 B 0644