Question

我编写了一个AWS lambda函数，用于在上传S3对象时发送文本消息。我已经确认了订阅，我可以收到SNS控制台发送的测试消息。

当我测试lambda时，所有日志都说方法成功，但没有任何儿子消息到达。这是函数（主要是示例模板，但在本文中为了安全性而改变了我的主题）。任何有关测试/尝试的事情的提示都会受到赞赏。

console.log('Loading function');
var aws = require('aws-sdk');
var s3 = new aws.S3({ apiVersion: '2006-03-01' });
exports.handler = function(event, context) {
    var bucket = event.Records[0].s3.bucket.name;
    var key = decodeURIComponent(event.Records[0].s3.object.key.replace(/\+/g, ' '));
    var params = {
        Bucket: bucket,
        Key: key
    };
    var sns = new aws.SNS();
    console.log('start of brians sns function')
    var pubResult = sns.publish({
        Message: 'Test publish to SNS from Lambda',
        TopicArn: 'arn:aws:sns:us-east-1:xxxxxxxxxxxx:lambdatop'
    }, function(err, data) {
        if (err) {
            console.log(err.stack);
            return;
        }
        console.log('push sent');
        console.log(data);
    });
    console.log('after sns publish:')
    console.log(pubResult)
    context.done(null, 'Brians Function Finished!');  
};

Answer 1

您在致电context.done()后立即致电publish()。 publish（）函数是一个异步调用，你不等待它完成。另外，我不认为您的变量pubResult包含您期望的变量。

试试这个：

console.log('Loading function');
var aws = require('aws-sdk');
exports.handler = function(event, context) {
    var sns = new aws.SNS();
    console.log('start of brians sns function')
    sns.publish({
        Message: 'Test publish to SNS from Lambda',
        TopicArn: 'arn:aws:sns:us-east-1:xxxxxxxxxxxx:lambdatop'
    }, function(err, data) {
        if (err) {
            console.log(err.stack);

            // Notify Lambda that we are finished, but with errors
            context.done(err, 'Brians Function Finished with Errors!');  
            return;
        }
        console.log('push sent');
        console.log(data);

        // Notify Lambda that we are finished
        context.done(null, 'Brians Function Finished!');  
    });
};

Answer 2

解决此问题的另一种方法是将SNS Publish包裹在Promise中，等待从Lambda处理程序中解决该问题。

exports.handler = async (event) => {
    await publishSNS(record, process.env.TOPIC_ARN);
}

async function publishSNS(payload, topicArn) {
    await SNS.publish({
        Message: JSON.stringify(payload),
        TargetArn: topicArn
    }).promise().then((data) => {
        console.log('SNS push succeeded: ', data);
    }).catch((err) => {
        console.error(err);
    });
}

AWS lambda发送SNS“成功”但不发送实际发送的消息

2 个答案: