README.md

Amazon.Lambda.KinesisFirehoseEvents

This package contains classes that can be used for AWS Lambda functions that perform data transformations on records written into an Amazon Kinesis Firehose delivery stream.

Sample Function

The following is a sample class and Lambda function that transforms Kinesis Firehose records by doing a ToUpper on the data.

public class Function
{

    public KinesisFirehoseResponse FunctionHandler(KinesisFirehoseEvent evnt, ILambdaContext context)
    {
        context.Logger.LogLine($"InvocationId: {evnt.InvocationId}");
        context.Logger.LogLine($"DeliveryStreamArn: {evnt.DeliveryStreamArn}");
        context.Logger.LogLine($"Region: {evnt.Region}");

        var response = new KinesisFirehoseResponse
        {
            Records = new List<KinesisFirehoseResponse.FirehoseRecord>()
        };

        foreach (var record in evnt.Records)
        {
            context.Logger.LogLine($"\tRecordId: {record.RecordId}");
            context.Logger.LogLine($"\t\tApproximateArrivalEpoch: {record.ApproximateArrivalEpoch}");
            context.Logger.LogLine($"\t\tApproximateArrivalTimestamp: {record.ApproximateArrivalTimestamp}");
            context.Logger.LogLine($"\t\tData: {record.DecodeData()}");

            // Transform data: For example ToUpper the data
            var transformedRecord = new KinesisFirehoseResponse.FirehoseRecord
            {
                RecordId = record.RecordId,
                Result = KinesisFirehoseResponse.TRANSFORMED_STATE_OK                    
            };
            transformedRecord.EncodeData(record.DecodeData().ToUpperInvariant());

            response.Records.Add(transformedRecord);
        }

        return response;
    }
}