File size: 6,617 Bytes
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import jsii
from aws_cdk import (
Aspects,
CfnCondition,
CfnOutput,
CfnParameter,
CfnResource,
Fn,
IAspect,
RemovalPolicy,
Stack,
)
from aws_cdk.aws_lambda import Architecture, CfnLayerVersionPermission, Runtime
from aws_cdk.aws_ssm import StringParameter
from constructs import Construct
from layer_constructors.layer_stack import LambdaPowertoolsLayerPythonV3
@jsii.implements(IAspect)
class ApplyCondition:
def __init__(self, condition: CfnCondition):
self.condition = condition
def visit(self, node):
if isinstance(node, CfnResource):
node.cfn_options.condition = self.condition
if isinstance(node, CfnOutput):
node.condition = self.condition
class Layer(Construct):
def __init__(
self,
scope: Construct,
construct_id: str,
layer_version_name: str,
powertools_version: str,
python_version: str,
architecture: Architecture | None = None,
**kwargs,
) -> None:
super().__init__(scope, construct_id, **kwargs)
layer = LambdaPowertoolsLayerPythonV3(
self,
"Layer",
layer_name=layer_version_name,
powertools_version=powertools_version,
python_version=python_version,
include_extras=True,
architecture=architecture or Architecture.X86_64,
)
layer.apply_removal_policy(RemovalPolicy.RETAIN)
self.layer_version_arn = layer.layer_version_arn
layer_permission = CfnLayerVersionPermission(
self,
"PublicLayerAccess",
action="lambda:GetLayerVersion",
layer_version_arn=layer.layer_version_arn,
principal="*",
)
layer_permission.apply_removal_policy(RemovalPolicy.RETAIN)
class LayerStack(Stack):
def __init__(
self,
scope: Construct,
construct_id: str,
powertools_version: str,
python_version: str,
ssm_parameter_layer_arn: str,
ssm_parameter_layer_arm64_arn: str,
**kwargs,
) -> None:
super().__init__(scope, construct_id, **kwargs)
python_version_normalized = python_version.replace(".", "")
layer_name_x86_64 = f"AWSLambdaPowertoolsPythonV3-{python_version_normalized}-x86_64"
layer_name_arm64 = f"AWSLambdaPowertoolsPythonV3-{python_version_normalized}-arm64"
if python_version == "python3.8":
python_version = Runtime.PYTHON_3_8
if python_version == "python3.9":
python_version = Runtime.PYTHON_3_9
if python_version == "python3.10":
python_version = Runtime.PYTHON_3_10
if python_version == "python3.11":
python_version = Runtime.PYTHON_3_11
if python_version == "python3.12":
python_version = Runtime.PYTHON_3_12
if python_version == "python3.13":
python_version = Runtime.PYTHON_3_13
has_arm64_support = CfnParameter(
self,
"HasARM64Support",
description="Has ARM64 Support Condition",
type="String",
allowed_values=["true", "false"],
)
has_arm64_condition = CfnCondition(
self,
"HasARM64SupportCondition",
expression=Fn.condition_equals(has_arm64_support, "true"),
)
has_no_arm64_condition = CfnCondition(
self,
"HasNOArm64SupportCondition",
expression=Fn.condition_equals(has_arm64_support, "false"),
)
# The following code is used when the region does not support ARM64 Lambdas. We make sure to only create the
# X86_64 Layer without specifying any compatible architecture, which would result in a CloudFormation error.
layer_single = Layer(
self,
f"LayerSingle-{python_version_normalized}",
layer_version_name=layer_name_x86_64,
python_version=python_version,
powertools_version=powertools_version,
)
Aspects.of(layer_single).add(ApplyCondition(has_no_arm64_condition))
Aspects.of(
StringParameter(
self,
f"SingleVersionArn-{python_version_normalized}",
parameter_name=ssm_parameter_layer_arn,
string_value=layer_single.layer_version_arn,
),
).add(ApplyCondition(has_no_arm64_condition))
# The following code is used when the region has support for ARM64 Lambdas. In this case, we explicitly
# create a Layer for both X86_64 and ARM64, specifying the compatible architectures.
# X86_64 layer
layer = Layer(
self,
f"Layer-{python_version_normalized}",
layer_version_name=layer_name_x86_64,
powertools_version=powertools_version,
python_version=python_version,
architecture=Architecture.X86_64,
)
Aspects.of(layer).add(ApplyCondition(has_arm64_condition))
Aspects.of(
StringParameter(
self,
f"VersionArn-{python_version_normalized}",
parameter_name=ssm_parameter_layer_arn,
string_value=layer.layer_version_arn,
),
).add(ApplyCondition(has_arm64_condition))
CfnOutput(
self,
"LatestLayerArn",
value=Fn.condition_if(
has_arm64_condition.logical_id,
layer.layer_version_arn,
layer_single.layer_version_arn,
).to_string(),
)
# ARM64 layer
layer_arm64 = Layer(
self,
f"Layer-ARM64-{python_version_normalized}",
layer_version_name=layer_name_arm64,
powertools_version=powertools_version,
python_version=python_version,
architecture=Architecture.ARM_64,
)
Aspects.of(layer_arm64).add(ApplyCondition(has_arm64_condition))
StringParameter(
self,
f"Arm64VersionArn-{python_version_normalized}",
parameter_name=ssm_parameter_layer_arm64_arn,
string_value=Fn.condition_if(
has_arm64_condition.logical_id,
layer_arm64.layer_version_arn,
"none",
).to_string(),
)
Aspects.of(CfnOutput(self, "LatestLayerArm64Arn", value=layer_arm64.layer_version_arn)).add(
ApplyCondition(has_arm64_condition),
)
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