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feat(kafka): New Kafka utility (#1898)
* Add initial code for KafkaJson and KafkaAvro request handlers. * Add deserialization via @Deserialization annotation. * Add TODOs in code. * Fix typos and make AbstractKafkaDeserializer package private. * Remove request handler implementation in favor for @Deserialization annotation. * Parse Timestamp type correctly. * Remove custom RequestHandler implementation example. * Make AspectJ version compatible with min version Java 11. * Clarify exception message when deserialization fails. * Add more advanced JSON escpaing to JSONSerializer in logging module. * Add protobuf deserialization logic and fully working example. * Add Maven profile to compile a JAR with different dependency combinations. * Add minimal kafka example. * Add missing copyright. * Add unit tests for kafka utility. * Add minimal kafka example to examples module in pom.xml. * Add some comments. * Update powertools-examples-kafka with README and make it more minimalistic. Remove powertools-examples-kafka-minimal. * Implement PR feedback from Karthik. * Fix SAM outputs. * Do not fail on unknown properties when deserializating into KafkaEvent. * Allow customers to bring their own kafka-clients dependency. * Add Kafka utility documentation. * Update project version consistently to 2.0.0. * fix: Fix bug where abbreviated _HANDLER env var did not detect the Deserialization annotation. * fix: Bug when trying to deserialize a type into itself for Lambda default behavior. We can just return the type itself. Relevant for simple String and InputStream handlers. * When falling back to Lambda default, handle conversion between InputStream and String. * Raise a runtime exception when the KafkaEvent is invalid. * docs: Announce deprecation of v1 * fix(metrics): Do not flush when no metrics were added to avoid printing root-level _aws dict (#1891) * fix(metrics): Do not flush when no metrics were added to avoid printing root-level _aws dict. * Fix pmd linting failures. * Rename docs to Kafka Consumer and add line highlights for code examples. * Fix Spotbug issues. * Reduce cognitive complexity of DeserializationUtils making it more modular and representing handler information in a simple HandlerInfo class. * Reduce cognitive complexity of AbstractKafkaDeserializer. * Enable removal policy DESTROY on e2e test for kinesis streams and SQS queues to avoid exceeding account limit. * Replace System.out with Powertools Logging. * Add notice about kafka-clients compatibility. * Add sentence stating that Avro / Protobuf classes can be autogenerated.
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‎docs/utilities/kafka.md

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‎examples/pom.xml

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<module>powertools-examples-parameters/sam</module>
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<module>powertools-examples-parameters/sam-graalvm</module>
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<module>powertools-examples-serialization</module>
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<module>powertools-examples-kafka</module>
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<module>powertools-examples-batch</module>
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<module>powertools-examples-validation</module>
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<module>powertools-examples-cloudformation</module>
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</plugins>
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</build>
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</project>

‎examples/powertools-examples-kafka/README.md

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# Powertools for AWS Lambda (Java) - Kafka Example
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This project demonstrates how to use Powertools for AWS Lambda (Java) to deserialize Kafka Lambda events directly into strongly typed Kafka ConsumerRecords<K, V> using different serialization formats.
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## Overview
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The example showcases automatic deserialization of Kafka Lambda events into ConsumerRecords using three formats:
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- JSON - Using standard JSON serialization
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- Avro - Using Apache Avro schema-based serialization
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- Protobuf - Using Google Protocol Buffers serialization
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Each format has its own Lambda function handler that demonstrates how to use the `@Deserialization` annotation with the appropriate `DeserializationType`, eliminating the need to handle complex deserialization logic manually.
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## Build and Deploy
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### Prerequisites
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- [AWS SAM CLI](https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/serverless-sam-cli-install.html)
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- Java 11+
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- Maven
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### Build
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```bash
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# Build the application
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sam build
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```
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### Deploy
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```bash
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# Deploy the application to AWS
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sam deploy --guided
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```
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During the guided deployment, you'll be prompted to provide values for required parameters. After deployment, SAM will output the ARNs of the deployed Lambda functions.
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### Build with Different Serialization Formats
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The project includes Maven profiles to build with different serialization formats:
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```bash
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# Build with JSON only (no Avro or Protobuf)
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mvn clean package -P base
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# Build with Avro only
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mvn clean package -P avro-only
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# Build with Protobuf only
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mvn clean package -P protobuf-only
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# Build with all formats (default)
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mvn clean package -P full
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```
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## Testing
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The `events` directory contains sample events for each serialization format:
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- `kafka-json-event.json` - Sample event with JSON-serialized products
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- `kafka-avro-event.json` - Sample event with Avro-serialized products
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- `kafka-protobuf-event.json` - Sample event with Protobuf-serialized products
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You can use these events to test the Lambda functions:
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```bash
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# Test the JSON deserialization function
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sam local invoke JsonDeserializationFunction --event events/kafka-json-event.json
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# Test the Avro deserialization function
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sam local invoke AvroDeserializationFunction --event events/kafka-avro-event.json
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# Test the Protobuf deserialization function
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sam local invoke ProtobufDeserializationFunction --event events/kafka-protobuf-event.json
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```
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## Sample Generator Tool
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The project includes a tool to generate sample JSON, Avro, and Protobuf serialized data. See the [tools/README.md](tools/README.md) for more information.

‎examples/powertools-examples-kafka/events/kafka-avro-event.json

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{
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"eventSource": "aws:kafka",
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"eventSourceArn": "arn:aws:kafka:us-east-1:0123456789019:cluster/SalesCluster/abcd1234-abcd-cafe-abab-9876543210ab-4",
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"bootstrapServers": "b-2.demo-cluster-1.a1bcde.c1.kafka.us-east-1.amazonaws.com:9092,b-1.demo-cluster-1.a1bcde.c1.kafka.us-east-1.amazonaws.com:9092",
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"records": {
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"mytopic-0": [
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{
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"topic": "mytopic",
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"partition": 0,
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"offset": 15,
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"timestamp": 1545084650987,
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"timestampType": "CREATE_TIME",
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"key": "NDI=",
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"value": "0g8MTGFwdG9wUrgehes/j0A=",
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"headers": [
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"partition": 0,
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"timestamp": 1545084650988,
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"timestampType": "CREATE_TIME",
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"key": "NDI=",
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"value": "1A8UU21hcnRwaG9uZVK4HoXrv4JA",
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}
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]
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}
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}

‎examples/powertools-examples-kafka/events/kafka-json-event.json

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{
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"eventSource": "aws:kafka",
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"eventSourceArn": "arn:aws:kafka:us-east-1:0123456789019:cluster/SalesCluster/abcd1234-abcd-cafe-abab-9876543210ab-4",
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"bootstrapServers": "b-2.demo-cluster-1.a1bcde.c1.kafka.us-east-1.amazonaws.com:9092,b-1.demo-cluster-1.a1bcde.c1.kafka.us-east-1.amazonaws.com:9092",
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"records": {
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"key": "NDI=",
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}

‎examples/powertools-examples-kafka/events/kafka-protobuf-event.json

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{
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"eventSource": "aws:kafka",
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"eventSourceArn": "arn:aws:kafka:us-east-1:0123456789019:cluster/SalesCluster/abcd1234-abcd-cafe-abab-9876543210ab-4",
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"bootstrapServers": "b-2.demo-cluster-1.a1bcde.c1.kafka.us-east-1.amazonaws.com:9092,b-1.demo-cluster-1.a1bcde.c1.kafka.us-east-1.amazonaws.com:9092",
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"records": {
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"mytopic-0": [
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{
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"topic": "mytopic",
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"partition": 0,
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"offset": 15,
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"timestamp": 1545084650987,
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"timestampType": "CREATE_TIME",
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"key": "NDI=",
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"value": "COkHEgZMYXB0b3AZUrgehes/j0A=",
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}
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]
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},
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{
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"topic": "mytopic",
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"partition": 0,
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"offset": 16,
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"timestamp": 1545084650988,
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"timestampType": "CREATE_TIME",
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"key": "NDI=",
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"value": "COoHEgpTbWFydHBob25lGVK4HoXrv4JA",
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}
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},
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{
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"topic": "mytopic",
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"partition": 0,
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"offset": 17,
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"timestamp": 1545084650989,
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}
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]
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}
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]
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}
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}

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