amazon-web-services - CloudFormation - 从 Lambda 代码访问参数

Question

我有一个 CloudFormation 模板，如下所示:

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "This template will deploy stuff",
    "Parameters":{
    "myParamToLambdaFunction" : {
        "Description" : "Please enter the the value",
        "Type" : "String",
        "ConstraintDescription" : "must have some value."
    }
},
"Resources": {
    "SecGrpValidatorFromCFTemplate": {
        "Type": "AWS::Lambda::Function",
        "Properties": {
            "FunctionName": "mylambdafunctionname",
            "Handler": "myfile.lambda_handler",
            "Role": {
                "Fn::GetAtt": ["somerole", "Arn"]
            },
            "Timeout": "30",
            "Runtime": "python2.7",
            "Code": {
                "S3Bucket":"mybucket",
                "S3Key":"mylambdafunction.zip"
            }
        }
    }
}

我需要将 myParamToLambdaFunction 的值传递给 Lambda 函数。

有办法吗？

Answer 1

截至18 Nov 2016 ，AWS Lambda 现在支持 environment variables ，CloudFormation 通过 Environment 支持属性 AWS::Lambda::Function资源。

向您的资源添加一个 Environment 属性，如下所示:

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Description": "This template will deploy stuff",
    "Parameters":{
    "myParamToLambdaFunction" : {
        "Description" : "Please enter the the value",
        "Type" : "String",
        "ConstraintDescription" : "must have some value."
    }
},
"Resources": {
    "SecGrpValidatorFromCFTemplate": {
        "Type": "AWS::Lambda::Function",
        "Properties": {
            "FunctionName": "mylambdafunctionname",
            "Handler": "myfile.lambda_handler",
            "Role": {
                "Fn::GetAtt": ["somerole", "Arn"]
            },
            "Timeout": "30",
            "Runtime": "python2.7",
            "Code": {
                "S3Bucket":"mybucket",
                "S3Key":"mylambdafunction.zip"
            },
            "Environment": {
                "Variables": {
                    "myParam": {
                        "Ref": "myParamToLambdaFunction"
                    }
                }
            }
        }
    }
}

然后根据您的运行时平台引用已部署的 Lambda 函数中的环境变量(例如，Python 中的 os.environ['myParam'])。