Amazon s3 如何在AWS CDK（Python）中使用S3 bucket资源创建层

我正在尝试将我的boto3代码（层创建）迁移到python中的CDK代码，这是我的boto3代码，其工作方式与Expected相同：

# Create the Lambda Function Layer
LAYERNAME = 'paramiko_Package'
if not aws_utils.checklayerExist(session,LAYERNAME):
    boto_Lambda = session.client('lambda')
    Layer = boto_Lambda.publish_layer_version(
        LayerName=LAYERNAME,
        Description='This contains  the Python 3.8 libs for paramiko',
        Content={
                'S3Bucket': BUCKET_NAME, 
                'S3Key': 'aws_cdk/libs/packageParamiko.zip'
            },
        CompatibleRuntimes=['python3.8'],
        LicenseInfo='none'
        )

这就像一个魅力，但我需要通过CDK并基于此链接：

代码示例：

layer = lambda_.LayerVersion(stack, "MyLayer",
    code=lambda_.Code.from_asset(path.join(__dirname, "layer-code")),  <--- should be S3 resource
    compatible_runtimes=[lambda_.Runtime.NODEJS_10_X],
    license="Apache-2.0",
    description="A layer to test the L2 construct"
)

---

经过一些调查后，我成功地创建了如下：

   iBucket = aws_s3.Bucket.from_bucket_arn(self,'s3bucketmonitor',bucket_arn='arn:aws:s3:::12111111-us-west-4-cdk-bucket')
aws_lambda.S3Code(iBucket,key='aws_cdk/libs/packageParamiko.zip')

layer = aws_lambda.LayerVersion(self, "MyLayer",
                            layer_version_name="MyLayer",
                            code=aws_lambda.S3Code(iBucket,key='aws_cdk/libs/packageParamiko.zip'),
                            compatible_runtimes=[aws_lambda.Runtime.PYTHON_3_8],
                            license="none",
                            description="A layer to test the L2 construct"
                            )

这将返回一个iLayerVersion对象，您可以直接在lambda代码上使用它

   iBucket = aws_s3.Bucket.from_bucket_arn(self,'s3bucketmonitor',bucket_arn='arn:aws:s3:::12111111-us-west-4-cdk-bucket')
aws_lambda.S3Code(iBucket,key='aws_cdk/libs/packageParamiko.zip')

layer = aws_lambda.LayerVersion(self, "MyLayer",
                            layer_version_name="MyLayer",
                            code=aws_lambda.S3Code(iBucket,key='aws_cdk/libs/packageParamiko.zip'),
                            compatible_runtimes=[aws_lambda.Runtime.PYTHON_3_8],
                            license="none",
                            description="A layer to test the L2 construct"
                            )