javascript - 在不执行对象复制的情况下使用 lambda 更新 amazon s3 对象元数据？

Question

是否可以在不复制对象的情况下使用 lambda 函数添​​加或更新 s3 对象元数据？ This 2 year old post says that we do need to make a copy , 但它已经 2 岁了，所以也许情况已经改变了？

Answer 1

使用s3.headObject通过 object.Metadata 方法和设置相应的元数据

我创建 lambda 并在创建新对象时将其订阅到事件:

console.log('Loading function');

const aws = require('aws-sdk');

const s3 = new aws.S3({ apiVersion: '2006-03-01' });


exports.handler = async (event, context, callback) => {
    console.log('Received event:', JSON.stringify(event, null, 2));

    const bucket = event.Records[0].s3.bucket.name;
    const key = decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, ' '));
    var params = {
        Bucket: bucket,
        Key: key,
        CopySource: encodeURIComponent( bucket+"/"+key ),
        Metadata: {
            mode: '33188',
        },
        MetadataDirective: 'REPLACE',
    };
    try {
        var data =  await s3.copyObject(params).promise();
        console.log('UPDATE SUCCESS', data);
    } catch (err) {
        console.log(err);
        const message = `Error updating object ${key} from bucket ${bucket}. Make sure they exist and your bucket is in the same region as this function.`;
        console.log(message);
        throw new Error(message);
    }
};

警告不要忘记这一点:

否则会陷入死循环