docs: add Docker demo on how to install transforms

README.md

@@ -4,7 +4,8 @@ A collection of [Single Message Transformations (SMTs)](https://kafka.apache.org
 
 ## Transformations
 
-See [the Kafka documentation](https://kafka.apache.org/documentation/#connect_transforms) for more details about configuring transformations. 
+See [the Kafka documentation](https://kafka.apache.org/documentation/#connect_transforms) for more details about configuring transformations
+or [demo](./demo) on how to install transforms.
 
 ### `ExtractTimestamp`
 

demo/Dockerfile

@@ -0,0 +1,10 @@
+FROM eclipse-temurin:11-jdk AS base
+
+ADD ./ transforms
+WORKDIR transforms
+
+RUN ./gradlew installDist
+
+FROM confluentinc/cp-kafka-connect:7.3.3
+
+COPY --from=base /transforms/build/install/transforms-for-apache-kafka-connect /transforms

demo/Makefile

@@ -0,0 +1,11 @@
+all: build
+
+build:
+	docker compose build
+
+up:
+	docker compose up -d
+
+test:
+	curl -sSL 'http://localhost:8083/connector-plugins?connectorsOnly=false' \
+		| jq '.[] | select(.type=="transformation") | select (.class | startswith("io.aiven"))'

demo/README.md

@@ -0,0 +1,116 @@
+# Demo
+
+How to load plugins to Kafka Connect installations.
+
+## Requirements
+
+To run the demo, you need:
+- Docker compose
+- `curl`
+- `jq`
+
+## Demo
+
+To install transforms into a Kafka Connect installation, it needs:
+
+- Build `transforms-for-apache-kafka-connect` libraries
+- Add libraries to Kafka Connect nodes
+- Configure Kafka Connect `plugin.path`
+
+### Build `transforms-for-apache-kafka-connect` libraries
+
+To build libraries, use `gradlew installDist` command.
+e.g. Dockerfile build:
+
+```dockerfile
+FROM eclipse-temurin:11-jdk AS base
+
+ADD ./ transforms
+WORKDIR transforms
+
+RUN ./gradlew installDist
+```
+
+This generates the set of libraries to be installed in Kafka Connect workers.
+
+### Add libraries to Kafka Connect nodes
+
+Copy the directory with libraries into your Kafka Connect nodes.
+e.g. add directory to Docker images:
+
+```dockerfile
+FROM confluentinc/cp-kafka-connect:7.3.3
+
+COPY --from=base /transforms/build/install/transforms-for-apache-kafka-connect /transforms
+```
+
+### Configure Kafka Connect `plugin.path`
+
+On Kafka Connect configuration file, set `plugin.path` to indicate where to load plugins from,
+e.g. with Docker compose:
+
+```yaml
+connect:
+  # ...
+  environment:
+    # ...
+    CONNECT_PLUGIN_PATH: /usr/share/java,/transforms # /transforms added on Dockerfile build
+```
+
+## Running
+
+1. Build docker images: `make build` or `docker compose build`
+2. Start environment: `make up` or `docker compose up -d`
+3. Test connect plugins are loaded: `make test`
+
+Sample response:
+```json lines
+{
+  "class": "io.aiven.kafka.connect.transforms.ConcatFields$Key",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.ConcatFields$Value",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.ExtractTimestamp$Key",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.ExtractTimestamp$Value",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.ExtractTopic$Key",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.ExtractTopic$Value",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.FilterByFieldValue$Key",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.FilterByFieldValue$Value",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.Hash$Key",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.Hash$Value",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.MakeTombstone",
+  "type": "transformation"
+}
+{
+  "class": "io.aiven.kafka.connect.transforms.TombstoneHandler",
+  "type": "transformation"
+}
+```

demo/compose.yml

@@ -0,0 +1,45 @@
+version: '3.8'
+services:
+  zookeeper:
+    image: "confluentinc/cp-zookeeper:7.3.3"
+    ports:
+      - "2181:2181"
+    environment:
+      ZOOKEEPER_CLIENT_PORT: 2181
+
+  kafka:
+    image: "confluentinc/cp-kafka:7.3.3"
+    ports:
+      - "9092:9092"
+    environment:
+      KAFKA_BROKER_ID: 1
+      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
+      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
+      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:19092,PLAINTEXT_HOST://localhost:9092
+      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
+      KAFKA_TRANSACTION_STATE_LOG_MIN_ISR: 1
+      KAFKA_TRANSACTION_STATE_LOG_REPLICATION_FACTOR: 1
+
+  connect:
+    build:
+      context: ../.
+      dockerfile: demo/Dockerfile
+    ports:
+      - "8083:8083"
+    environment:
+      CONNECT_BOOTSTRAP_SERVERS: kafka:19092
+      CONNECT_REST_ADVERTISED_HOST_NAME: localhost
+      CONNECT_REST_PORT: 8083
+      CONNECT_GROUP_ID: connect-demo
+      CONNECT_CONFIG_STORAGE_TOPIC: connect-demo-configs
+      CONNECT_CONFIG_STORAGE_REPLICATION_FACTOR: 1
+      CONNECT_OFFSET_FLUSH_INTERVAL_MS: 10000
+      CONNECT_OFFSET_STORAGE_TOPIC: connect-demo-offsets
+      CONNECT_OFFSET_STORAGE_REPLICATION_FACTOR: 1
+      CONNECT_STATUS_STORAGE_TOPIC: connect-demo-status
+      CONNECT_STATUS_STORAGE_REPLICATION_FACTOR: 1
+
+      CONNECT_KEY_CONVERTER: org.apache.kafka.connect.storage.StringConverter
+      CONNECT_KEY_CONVERTER_SCHEMA_ENABLE: "false"
+      CONNECT_VALUE_CONVERTER: org.apache.kafka.connect.json.JsonConverter
+      CONNECT_PLUGIN_PATH: /usr/share/java,/transforms # /transforms added on Dockerfile build