How to Support Multiple Triggers in AWS Lambda with Golang?

Supporting Multiple Triggers in AWS Lambda with Golang

In AWS Lambda, you can create functions that respond to various events, such as S3 triggers and SQS messages. However, it can be challenging to support multiple triggers in a single function. This article will guide you through the steps required to accomplish this task in Golang.

You initially attempted to register two different handlers for S3 events and SQS messages. However, this approach led to either the first handler being invoked every time or the Lambda failing to detect the event type.

To overcome this limitation, we recommend using the AWS Handler interface. This interface defines a single method, Invoke, which accepts the raw bytes of the event as its argument.

Below is an example implementation of a multi-event handler:

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

func (h Handler) Invoke(ctx context.Context, data []byte) ([]byte, error) {
    // Unmarshall the event data into different supported event types
    apiGatewayEvent := new(events.APIGatewayProxyRequest)
    if err := json.Unmarshal(data, apiGatewayEvent); err != nil {
        log.Println("Not an API Gateway event")
    }

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

    // Perform appropriate actions based on the event type

    return nil, nil
}

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

This handler allows you to handle any AWS event with the same Lambda function. It's important to note, however, that lambdas are generally best suited for handling a single type of event. Using a multi-event handler may introduce complexities in testing and debugging.

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