Unmarshaling a DynamoDB Stream event into a custom struct inside a Lambda Go function

main.go

package main

import (
        "context"

        "github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-sdk-go/service/dynamodb"
        "github.com/aws/aws-sdk-go/service/dynamodb/dynamodbattribute"
)


type DynamoEventChange struct {
	NewImage *dynamodb.AttributeValue `json:"NewImage"`
	// ... more fields if needed: https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_streams_GetRecords.html
}

type DynamoEventRecord struct {
	Change    DynamoEventChange `json:"dynamodb"`
	EventName string            `json:"eventName"`
	EventID   string            `json:"eventID"`
	// ... more fields if needed: https://docs.aws.amazon.com/amazondynamodb/latest/APIReference/API_streams_GetRecords.html
}

type DynamoEvent struct {
	Records []DynamoEventRecord `json:"records"`
}

func handler(ctx context.Context, event DynamoEvent) error {
	for _, record := range event.Records {
		var myStruct *MyStruct
		err := dynamodbattribute.Unmarshal(record.Change.NewImage, &myStruct)
		if err != nil {
			return err
		}
		// ... so on
	}
}

func main() {
	lambda.Start(handler)
}

NewImage should be changed to:

NewImage map[string]*dynamodb.AttributeValue `json:"NewImage"`