Knative
With the changes in the design of the Knative connector, this document is currently temporarily outdated.
Prerequisite
Create Knative Source and Sink
We use the cloudevents-player Knative service as an example. If you do not know how to create cloudevents-player Knative service as source and sink, please follow the steps in this link.
Set up EventMesh Configuration
- Add the following lines to eventmesh-starter/build.gradle file.
plugins {
id 'application'
}
application {
mainClass = project.hasProperty("mainClass") ? project.getProperty("mainClass") : 'org.apache.eventmesh.starter.StartUp'
applicationDefaultJvmArgs = [
'-Dlog4j.configurationFile=../eventmesh-runtime/conf/log4j2.xml', '-Deventmesh.log.home=../eventmesh-runtime/logs', '-Deventmesh.home=../eventmesh-runtime', '-DconfPath=../eventmesh-runtime/conf'
]
}
dependencies {
implementation project(":eventmesh-connector-plugin:eventmesh-connector-knative")
implementation project(":eventmesh-runtime")
}
- Add the following lines to eventmesh-examples/build.gradle file.
plugins {
id 'application'
}
application {
mainClass = project.hasProperty("mainClass") ? project.getProperty("mainClass") : 'NULL'
}
- Set
eventMesh.connector.plugin.type=knative
in eventmesh-runtime/conf/eventmesh.properties file.
Demo
Publish an Event Message from Knative and Subscribe from EventMesh
Step 1: Start an EventMesh Runtime Server
$ cd eventmesh-starter
$ ../gradlew -PmainClass=org.apache.eventmesh.starter.StartUp run
Step 2: Publish an Event Message from Knative
$ curl -i http://cloudevents-player.default.127.0.0.1.sslip.io -H "Content-Type: application/json" -H "Ce-Id: 123456789" -H "Ce-Specversion: 1.0" -H "Ce-Type: some-type" -H "Ce-Source: command-line" -d '{"msg":"Hello CloudEvents!"}'
Step 3: Subscribe from an EventMesh
- Set
public static final String EVENTMESH_HTTP_ASYNC_TEST_TOPIC = "messages";
in ExampleConstants.java file.
$ cd eventmesh-examples
$ ../gradlew -PmainClass=org.apache.eventmesh.http.demo.sub.SpringBootDemoApplication run
Expected Result
The following message with data
field as Hello CloudEvents!
will be printed on the console of EventMesh server.
2022-09-05 16:37:58,237 INFO [eventMesh-clientManage-] DefaultConsumer(DefaultConsumer.java:60) - \
[{"event":{"attributes":{"datacontenttype":"application/json","id":"123456789","mediaType":"application/json",\
"source":"command-line","specversion":"1.0","type":"some-type"},"data":{"msg":"Hello CloudEvents!"},"extensions":{}},\
"id":"123456789","receivedAt":"2022-09-05T10:37:49.537658+02:00[Europe/Madrid]","type":"RECEIVED"}]
Publish an Event Message from EventMesh and Subscribe from Knative
Step 1: Start an EventMesh Runtime Server
$ cd eventmesh-starter
$ ../gradlew -PmainClass=org.apache.eventmesh.starter.StartUp run
Step 2: Publish an Event Message from EventMesh
We use a test program to demo this function.
$ cd eventmesh-connector-plugin/eventmesh-connector-knative
$ ../../gradlew clean test --tests KnativeProducerImplTest.testPublish
Step 3: Subscribe from Knative
$ curl http://cloudevents-player.default.127.0.0.1.sslip.io/messages
Expected Result
The following message with data
field as Hello Knative from EventMesh!
will be printed on the console of EventMesh server.
2022-09-05 16:52:41,633 INFO [eventMesh-clientManage-] DefaultConsumer(DefaultConsumer.java:60) - \
[{"event":{"attributes":{"datacontenttype":"application/json","id":"1234","mediaType":"application/json",\
"source":"java-client","specversion":"1.0","type":"some-type"},"data":{"msg":["Hello Knative from EventMesh!"]},"extensions":{}},"id":"1234","receivedAt":"2022-09-05T10:52:32.999273+02:00[Europe/Madrid]","type":"RECEIVED"}]