How to Effectively Support Multiple Triggers in Your AWS Lambda Function with Golang?

Supporting Multiple Triggers in AWS Lambda with Golang

Problem

When developing an AWS Lambda function in Golang, it may be necessary to support multiple triggers, such as S3 and SQS. However, implementing this can be challenging, as the initial attempts described in the question often lead to unintended behavior.

Solution

To effectively support multiple triggers, it's recommended to implement the AWS Handler interface, which defines the Invoke method with the following signature:

Invoke(ctx context.Context, payload []byte) ([]byte, error)

By implementing the Handler interface, your function can receive and process raw event data from various AWS sources. Here's an example of a multievent handler:

<code class="go">type Handler struct {
  // Add global variables or context information here
}

func (h Handler) Invoke(ctx context.Context, payload []byte) ([]byte, error) {
  // Parse the data as different event types for demonstration purposes

  apiGatewayEvent := new(events.APIGatewayProxyRequest)
  if err := json.Unmarshal(payload, apiGatewayEvent); err != nil {
    log.Println("Not a API Gateway event")
  }

  snsEvent := new(events.SNSEvent)
  if err := json.Unmarshal(payload, snsEvent); err != nil {
    log.Println("Not an SNS event")
  }

  // Handle the events as needed

  return nil, nil
}

func main() {
  lambda.StartHandler(Handler{})
}</code>

This approach allows your Lambda to receive and process events from multiple AWS services. However, it's important to carefully consider whether a multievent handler aligns with your application's architecture, as Lambda functions are typically designed to handle a specific type of event.

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