AWS Lambda &SNS:跨区域调用Lambda

问题描述：

我在多个区域部署了一个 Lambda 函数.我想向将调用这些函数的 SNS 发布一条消息.

I have a Lambda function deployed to several regions. I would like to publish a message to SNS that will invoke these functions.

我使用 aws-cli 创建了主题，授予 Lambda 与 SNS 对话的权限，并创建订阅.订阅似乎已成功创建，我可以在 AWS 控制台中看到它.但是，它不起作用.不会调用 lambda 函数.

Using aws-cli I've created the topics, given Lambda permission to talk to SNS, and create the subscriptions. The subscription appears to be created successfully, and I can see it in the AWS console. But, it doesn't work. The lambda function does not get invoked.

答

这是基于 CloudFormation 的示例.您必须将 SNS 的调用权限添加到 Lambda 函数:

This is CloudFormation based example. You have to add invoke permission for SNS to the Lambda functions:

{
    "Type" : "AWS::Lambda::Permission",
    "Properties" : {
        "FunctionName" : { "Fn::GetAtt" : [ "YourLambda", "Arn" ] },
        "Action" : "lambda:InvokeFunction",
        "Principal" : "sns.amazonaws.com",
        "SourceArn" : { "Ref" : "YourSNSTopicArn" }
    }
}

然后您需要将您的 Lambdas 订阅到您的 SNS 主题.这可以通过 API 调用或通过 CloudFormation 来完成.

Then you need to subscribe your Lambdas to your SNS topic. This can be done via API call or through CloudFormation.

{
    "Type" : "AWS::SNS::Topic",
    "Properties" : {
        "TopicName" : "YourTopicName",
        "Subscription" : [ {
            "Endpoint" : { "Fn::GetAtt" : [ "YourLambda", "Arn" ] },
            "Protocol": "lambda"
        } ]
    }
}

如果您遗漏了其中任何一项，您的 Lambdas 将不会被调用.以上信息来源为官方博客文章InvokingLambda 通过 SNS 运行.

If you're missing any of this, your Lambdas won't invoke. Source for the above information is the official blog article Invoking Lambda functions via SNS.

AWS Lambda &SNS:跨区域调用Lambda

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