从S3获取Zip包至AWS Lambda Function构造报错求助

使用AWS CDK通过S3 Deploy将Lambda代码打包为Zip包部署到指定S3桶，后续Lambda引用该Zip对象时触发错误：

Error occurred while GetObject. S3 Error Code: NoSuchKey. S3 Error Message: The specified key does not exist.

尝试将S3桶创建和部署移至独立堆栈，导出后导入Lambda堆栈，控制台能看到桶和Zip包哈希值，但错误依旧。

附当前代码：

export class LambdaStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

     // Define the S3 bucket for deployment
     const deploymentBucket = new s3.Bucket(this, 'DeploymentBucket', {
      bucketName: 'test-deployment-bucket-100',
      versioned: true,
    });

    // Deploy the Lambda function code to the S3 bucket
    const deployment = new s3deploy.BucketDeployment(this, 'DeployLambdaCode', {
      sources: [s3deploy.Source.asset(path.join(__dirname, '../lambda/test'))],
      destinationBucket: deploymentBucket,
      //destinationKeyPrefix: '',
      extract: false,
    });

    // Define the Lambda function
    const lambdaFunction = new lambda.Function(this, 'LambdaFunction', {
      runtime: lambda.Runtime.NODEJS_18_X,
      //pick up lambda code from the S3 bucket
      code: lambda.Code.fromBucket(deployment.deployedBucket, cdk.Fn.select(0, deployment.objectKeys)),
      handler: 'index.handler',
    });

    // Add dependency to wait for the S3 deployment to complete
    lambdaFunction.node.addDependency(deploymentBucket);
  }
}

问题修复方案 #

1. 修正依赖关系 #

你当前给Lambda添加的依赖是S3桶对象，但实际需要依赖的是S3部署操作，确保Lambda在代码上传完成后再创建。

2. 简化对象键引用 #

无需手动使用cdk.Fn.select(0, deployment.objectKeys)获取对象键，CDK提供了deployment.deployedObjectKey属性，能直接、可靠地获取部署后的Zip包对象键。

修改后的代码：

export class LambdaStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    // Define the S3 bucket for deployment
    const deploymentBucket = new s3.Bucket(this, 'DeploymentBucket', {
      bucketName: 'test-deployment-bucket-100',
      versioned: true,
    });

    // Deploy the Lambda function code to the S3 bucket
    const deployment = new s3deploy.BucketDeployment(this, 'DeployLambdaCode', {
      sources: [s3deploy.Source.asset(path.join(__dirname, '../lambda/test'))],
      destinationBucket: deploymentBucket,
      extract: false,
    });

    // Define the Lambda function
    const lambdaFunction = new lambda.Function(this, 'LambdaFunction', {
      runtime: lambda.Runtime.NODEJS_18_X,
      // 使用deployedObjectKey直接获取部署后的对象键
      code: lambda.Code.fromBucket(deployment.deployedBucket, deployment.deployedObjectKey),
      handler: 'index.handler',
    });

    // 修正依赖：等待S3部署完成后再创建Lambda
    lambdaFunction.node.addDependency(deployment);
  }
}

额外排查点 #

• 确认../lambda/test路径下存在有效代码文件，CDK打包时能正确生成Zip包
• 若使用跨堆栈部署，确保导出的是deployment.deployedBucket.bucketName和deployment.deployedObjectKey，而非手动拼接哈希值
• 桶开启版本控制时，CDK会自动处理版本化场景下的对象引用，无需手动指定版本ID

内容的提问来源于stack exchange，提问作者Notiq Olusesi