AWS Lambda &SNS:跨区域调用Lambda

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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.

推荐答案

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", "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.