How to Support Multiple Triggers in AWS Lambda with Go?

Supporting Multiple Triggers in AWS Lambda with Go

Creating AWS Lambda functions that can respond to multiple triggers is a common need. This article explores how to achieve this in Go using the AWS SDK.

Failed Attempts

Initially, two attempts were made to enable multiple triggers:

• Defining Separate Event Handlers:

  • lambda.Start(ProcessIncomingS3Events)
  • lambda.Start(ProcessIncomingEvents)
  • However, all triggers called ProcessIncomingS3Events.

• Switching Event Types:

  • lambda.Start(ProcessIncomingEvents)
  • ProcessIncomingEvents(event interface{})
  • This approach returned "Could not find the event type" for all triggers.

Solution: Implement the AWS Handler Interface

The AWS Handler interface provides a way to handle multiple events with a single Lambda function. It defines the Invoke method, which receives raw event data and returns a response.

An example implementation that handles various events is presented below:

<code class="go">import (
    "context"
    "encoding/json"
    "github.com/aws/aws-lambda-go/events"
    "log"
)

type Handler struct {}

func (h Handler) Invoke(ctx context.Context, data []byte) ([]byte, error) {
    // Create and unmarshal event objects
    apiGatewayEvent := new(events.APIGatewayProxyRequest)
    json.Unmarshal(data, apiGatewayEvent)

    snsEvent := new(events.SNSEvent)
    json.Unmarshal(data, snsEvent)

    // Handle events as needed

    return nil, nil
}

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

Considerations

While supporting multiple triggers in Lambda is possible, it's crucial to use it judiciously. Lambdas are designed to handle specific types of events efficiently. Mixing multiple event types requires careful consideration and may impact performance and reliability.

The above is the detailed content of How to Support Multiple Triggers in AWS Lambda with Go?. For more information, please follow other related articles on the PHP Chinese website!