nakadi 是zalando 开源的一款基于kafka 的event broker ，我们可以方便的使用http 协议进行操作
支持一些特性：
- stream 操作，我们可以流的方式订阅event
- event 支持基于json schema 我们可以对于event 进行数据校验，方便的schema 注册
- 支持oauth 、event type 的安全认证，同时也支持黑名单用户以及应用授权
- 比较全的监控集成
环境准备
- docker-compose 文件
说明使用pg 存储基本的元数据，此项目集成了UI界面
version: '3'
services:
nakadi-ui:
image: nakadi/nakadi-ui
ports:
- "3000:3000"
depends_on:
- nakadi
environment:
- NAKADI_API_URL=http://nakadi:8080
nakadi:
image: adyach/nakadi-docker:latest
ports:
- "8080:8080"
depends_on:
- postgres
- zookeeper
- kafka
environment:
- SPRING_PROFILES_ACTIVE=local
- NAKADI_OAUTH2_MODE=OFF
- NAKADI_ZOOKEEPER_BROKERS=zookeeper:2181
- SPRING_DATASOURCE_URL=jdbc:postgresql://postgres:5432/local_nakadi_db
postgres:
image: adyach/nakadi-postgres:latest
ports:
- "5432:5432"
environment:
POSTGRES_USER: nakadi
POSTGRES_PASSWORD: nakadi
POSTGRES_DB: local_nakadi_db
zookeeper:
image: wurstmeister/zookeeper:3.4.6
ports:
- "2181:2181"
kafka:
image: wurstmeister/kafka:1.1.0
ports:
- "9092:9092"
depends_on:
- zookeeper
environment:
KAFKA_ADVERTISED_HOST_NAME: kafka
KAFKA_ADVERTISED_PORT: 9092
KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
KAFKA_AUTO_CREATE_TOPICS_ENABLE: 'false'
KAFKA_DELETE_TOPIC_ENABLE: 'true'
KAFKA_BROKER_ID: 0
volumes:
- /var/run/docker.sock:/var/run/docker.sock
启动&&测试
- 启动
docker-compose up -d
- 创建event type
curl -v -XPOST http://localhost:8080/event-types -H "Content-type: application/json" -d '{
"name": "order.ORDER_RECEIVED",
"owning_application": "order-service",
"category": "undefined",
"partition_strategy": "random",
"schema": {
"type": "json_schema",
"schema": "{ \"properties\": { \"order_number\": { \"type\": \"string\" } } }"
}
}'
- 发布event
curl -v -XPOST http://localhost:8080/event-types/order.ORDER_RECEIVED/events -H "Content-type: application/json" -d '[
{
"order_number": "24873243241",
"metadata": {
"eid": "d765de34-09c0-4bbb-8b1e-7160a33a0791",
"occurred_at": "2016-03-15T23:47:15+01:00"
}
}, {
"order_number": "24873243242",
"metadata": {
"eid": "a7671c51-49d1-48e6-bb03-b50dcf14f3d3",
"occurred_at": "2016-03-15T23:47:16+01:00"
}
}]'
- 订阅event
curl -v http://localhost:8080/event-types/order.ORDER_RECEIVED/events
- 效果
{"cursor":{"partition":"0","offset":"001-0001-000000000000000059"},"events":[{"order_number":"24873243242","metadata":{"occurred_at":"2016-03-15T23:47:16+01:00","eid":"a7671c51-49d1-48e6-bb03-b50dcf14f3d3","event_type":"order_received","partition":"0","received_at":"2018-12-12T14:12:36.479Z","flow_id":"9XJC8HBQY1lqiNK5N8g9doXR","version":"1.0.0"}}]}
{"cursor":{"partition":"0","offset":"001-0001-000000000000000060"},"events":[{"order_number":"24873243241","metadata":{"occurred_at":"2016-03-15T23:47:15+01:00","eid":"d765de34-09c0-4bbb-8b1e-7160a33a0791","event_type":"order_received","partition":"0","received_at":"2018-12-12T14:12:37.603Z","flow_id":"PIvB1uG1qicLUiTWPyu8nMZI","version":"1.0.0"}}]}
{"cursor":{"partition":"0","offset":"001-0001-000000000000000061"},"events":[{"order_number":"24873243242","metadata":{"occurred_at":"2016-03-15T23:47:16+01:00","eid":"a7671c51-49d1-48e6-bb03-b50dcf14f3d3","event_type":"order_received","partition":"0","received_at":"2018-12-12T14:12:37.603Z","flow_id":"PIvB1uG1qicLUiTWPyu8nMZI","version":"1.0.0"}}]}
说明
nakadi 的功能还是很强大的，对于kafka 的集成，可以让我们只需要关注业务系统功能的开发