c# - 如何使用 C# 通过 AWS lambda 处理 S3 事件上的文件

Question

我正在寻找 C# 代码块以在 PUT 事件上从 S3 读取文件并将文件上传到另一个存储桶。我对 C# 相当陌生，看到大多数博客都是为 python 和 java 编写的。任何帮助将不胜感激。

谢谢，

Answer 1

我知道为时已晚，但也许这会对其他人有所帮助。
您需要添加 Amazon.Lambda.S3Events Nuget 包。查看代码，这是您的 Lambda 函数的样子:

using System;
using System.Threading.Tasks;
using Amazon.Lambda.Core;
using Amazon.Lambda.S3Events;
using Amazon.S3;
using Amazon.S3.Model;

public async Task<string> FunctionHandler(S3Event evnt, ILambdaContext context)
    {
        var s3Event = evnt.Records?[0].S3;
        if(s3Event == null)
        {
            return null;
        }

        try
        {
            var destinationBucketName = "your_bucket_to_upload";
            var destinationKey= "folder/subfolder/fileName.txt";

            var s3 = new AmazonS3Client();
            var request = new CopyObjectRequest
            {
                SourceBucket = s3Event.Bucket.Name,
                SourceKey = s3Event.Object.Key,
                DestinationBucket = destinationBucketName,
                DestinationKey = destinationKey
            };
            
            var response = await s3.CopyObjectAsync(request);
            return response.HttpStatusCode.ToString();
        }
        catch(Exception e)
        {
            context.Logger.LogLine($"Error getting object {s3Event.Object.Key} from bucket {s3Event.Bucket.Name}. Make sure they exist and your bucket is in the same region as this function.");
            context.Logger.LogLine(e.Message);
            context.Logger.LogLine(e.StackTrace);
            throw;
        }
    }

您可以在此处找到适用于 Visual Studio 的 AWS Toolkit:
https://docs.aws.amazon.com/lambda/latest/dg/csharp-package-toolkit.html