Kafka REST Proxy
The Kafka REST Proxy provides a RESTful interface to a Kafka cluster. It makes
it easy to produce and consume messages, view the state of the cluster, and
perform administrative actions without using the native Kafka protocol or
clients. Examples of use cases include reporting data to Kafka from any
frontend app built in any language, ingesting messages into a stream processing
framework that doesn't yet support Kafka, and scripting administrative actions.
Installation
You can download prebuilt versions of the Kafka REST Proxy as part of the
Confluent Platform.
You can read our full installation instructions and the complete documentation
To install from source, follow the instructions in the Development section below.
Deployment
The REST proxy includes a built-in Jetty server. The wrapper scripts
bin/kafka-rest-start and bin/kafka-rest-stop are the recommended method of
starting and stopping the service.
Quickstart
The following assumes you have Kafka and an instance of
the REST Proxy running using the default settings and some topics already created.
# Get a list of topics
$ curl "http://localhost:8082/topics"
["__consumer_offsets","jsontest"]
# Get info about one topic
$ curl "http://localhost:8082/topics/jsontest"
{"name":"jsontest","configs":{},"partitions":[{"partition":0,"leader":0,"replicas":[{"broker":0,"leader":true,"in_sync":true}]}]}
# Produce a message with JSON data
$ curl -X POST -H "Content-Type: application/vnd.kafka.json.v2+json" \
--data '{"records":[{"value":{"name": "testUser"}}]}' \
"http://localhost:8082/topics/jsontest"
{"offsets":[{"partition":0,"offset":3,"error_code":null,"error":null}],"key_schema_id":null,"value_schema_id":null}
# Create a consumer for JSON data, starting at the beginning of the topic's
# log. The consumer group is called "my_json_consumer" and the instance is "my_consumer_instance".
$ curl -X POST -H "Content-Type: application/vnd.kafka.v2+json" -H "Accept: application/vnd.kafka.v2+json" \
--data '{"name": "my_consumer_instance", "format": "json", "auto.offset.reset": "earliest"}' \
http://localhost:8082/consumers/my_json_consumer
{"instance_id":"my_consumer_instance","base_uri":"http://localhost:8082/consumers/my_json_consumer/instances/my_consumer_instance"}
# Subscribe the consumer to a topic
$ curl -X POST -H "Content-Type: application/vnd.kafka.v2+json" --data '{"topics":["jsontest"]}' \
http://localhost:8082/consumers/my_json_consumer/instances/my_consumer_instance/subscription
# No content in response
# Then consume some data from a topic using the base URL in the first response.
$ curl -X GET -H "Accept: application/vnd.kafka.json.v2+json" \
http://localhost:8082/consumers/my_json_consumer/instances/my_consumer_instance/records
[{"key":null,"value":{"name":"testUser"},"partition":0,"offset":3,"topic":"jsontest"}]
# Finally, close the consumer with a DELETE to make it leave the group and clean up
# its resources.
$ curl -X DELETE -H "Accept: application/vnd.kafka.v2+json" \
http://localhost:8082/consumers/my_json_consumer/instances/my_consumer_instance
# No content in response
Development
To build a development version, you may need a development versions of
common,
rest-utils, and
schema-registry. After
installing these, you can build the Kafka REST Proxy
with Maven. All the standard lifecycle phases work.
Contribute
- Source Code: https://github.com/confluentinc/kafka-rest
- Issue Tracker: https://github.com/confluentinc/kafka-rest/issues
License
This project is licensed under the Confluent Community License.