AWS Cloudformation Lambda S3 - 循环依赖

Question

提前致谢！

所以我在下面创建了这个 Cloudformation 模板，但出现循环依赖错误。我知道是什么导致了错误，但想不出解决方案来实现我想要实现的目标。

这是;

• 为我需要在函数代码中使用的两个存储桶创建一个具有两个环境变量的 lambda 函数

• 创建两个 s3 存储桶，一个用于文件输入，一个用于文件输出

• 创建一个触发器，在对象添加到第一个存储桶时调用 lambda 函数

这是我的代码：

      "lambda": {
            "Type": "AWS::Lambda::Function",
            "DependsOn": [
                "s3accessrole",
                "s3rolepolicies",
                "bucket1"
            ],
            "Properties": {
                "Code": {
                    "S3Bucket": "resource-bucket",
                    "S3Key": "filepath/function.zip"
                },
                "Role": {
                    "Fn::GetAtt": [
                        "s3accessrole",
                        "Arn"
                    ]
                },
                "Timeout": 60,
                "Handler": "function.handler",
                "Runtime": "nodejs6.10",
                "MemorySize": 1024,
                "Environment": {
                    "Variables": {
                        "bucket1": {
                            "Ref": "bucket1"
                        },
                        "bucket2": {
                            "Ref": "bucket2"
                        }
                    }
                }
            },
            "Metadata": {
                "AWS::CloudFormation::Designer": {
                    "id": "XXXX"
                }
            }
        },
        "bucket1": {
            "Type": "AWS::S3::Bucket",
            "Properties": {
                "AccessControl": "Private",
                "LifecycleConfiguration": {
                    "Rules": [
                        {
                            "ExpirationInDays": "1",
                            "Id": "delete images/",
                            "Status": "Enabled"
                        }
                    ]
                },
                "VersioningConfiguration": {
                    "Status": "Suspended"
                },
                "NotificationConfiguration": {
                    "LambdaConfigurations": [
                        {
                            "Event": "s3:ObjectCreated:*",
                            "Function": {
                                "Ref": "lambda"
                            }
                        }
                    ]
                }
            },
            "Metadata": {
                "AWS::CloudFormation::Designer": {
                    "id": "XXXX"
                }
            }
        },
        "lambdaperm": {
            "Type": "AWS::Lambda::Permission",
            "Properties": {
                "Action": "lambda:InvokeFunction",
                "FunctionName": {
                    "Ref": "lambda"
                },
                "Principal": "s3.amazonaws.com",
                "SourceAccount": {
                    "Ref": "AWS::AccountId"
                },
                "SourceArn": {
                    "Fn::Join": [
                        ":",
                        [
                            "arn",
                            "aws",
                            "s3",
                            "",
                            "",
                            {
                                "Ref": "bucket1"
                            }
                        ]
                    ]
                }
            },
            "Metadata": {
                "AWS::CloudFormation::Designer": {
                    "id": "XXXX"
                }
            }
        },
        "bucket2": {
            "Type": "AWS::S3::Bucket",
            "Properties": {
                "AccessControl": "Private",
                "LifecycleConfiguration": {
                    "Rules": [
                        {
                            "ExpirationInDays": "1",
                            "Id": "delete images/",
                            "Status": "Enabled"
                        }
                    ]
                },
                "VersioningConfiguration": {
                    "Status": "Suspended"
                }
            },
            "Metadata": {
                "AWS::CloudFormation::Designer": {
                    "id": "XXXX"
                }
            }
        }

Answer 1

lambda 函数中来自第一个存储桶的传入事件包含用于该存储桶的名称，因此我不需要创建环境变量。