Kafka Connect Jenkins

Kafka Connect Connector for Jenkins Open Source Continuous Integration Tool.

What is it?

kafka-connect-jenkins is a Kafka Connector for loading data from Jenkins Open Source Continuous Integration Tool.

Details

+--------+   0..*   +-------+  0..*   +-------+   1      +--------------+
| Server +--------> |  Job  +-------> | Build +--------> | BuildDetails |
+--------+          +-------+         +-------+          +--------------+

The following comparison might give you more insight.

Example	Input Partitions (Logical)	Records	Offsets/Position
Set of files	each File	each Line	line Number within a file
Database instance	each Table	each Row	primary id + timestamp
Jenkins Server	each Job	BuildDetails of each Build (lastBuild)	build number of lastBuild

Example

We will use Apache Jenkins REST API to demonstrate an example.

Resource	Details
Get list of all Jobs: https://builds.apache.org/api/json GET lastBuild of Abdera-trunk Job: https://builds.apache.org/job/Abdera-trunk/api/json GET BuildDetails for build 2546 of job Abdera-trunk: https://builds.apache.org/job/Abdera-trunk/2546/api/json

What gets published to the topic?

The BuildDetails is treated as an event and is persisted to the topic in JSON format. Below is the content of a sample event

{
    "actions": [
        {
            "causes": [
                {
                    "shortDescription": "Started by an SCM change"
                }
            ]
        },
        {},
        {},
        {},
        {},
        {},
        {},
        {
            "failCount": 0,
            "skipCount": 1,
            "totalCount": 491,
            "urlName": "testReport"
        },
        {},
        {}
    ],
    "artifacts": [],
    "building": false,
    "description": null,
    "displayName": "#2546",
    "duration": 480582,
    "estimatedDuration": 457794,
    "executor": null,
    "fullDisplayName": "Abdera-trunk #2546",
    "id": "2015-08-25_22-08-43",
    "keepLog": false,
    "number": 2546,
    "queueId": -1,
    "result": "SUCCESS",
    "timestamp": 1440540523000,
    "url": "https://builds.apache.org/job/Abdera-trunk/2546/",
    "builtOn": "jenkins-ubuntu-1404-4gb-c51",
    "changeSet": {
        "items": [
            {
                "affectedPaths": [
                    "client/src/test/java/org/apache/abdera/test/client/util/MultipartRelatedRequestEntityTest.java"
                ],
                "author": {
                    "absoluteUrl": "https://builds.apache.org/user/veithen",
                    "fullName": "veithen"
                },
                "commitId": "1697770",
                "timestamp": 1440537458260,
                "date": "2015-08-25T21:17:38.260515Z",
                "msg": "Use factory to create FOMEntry instance.",
                "paths": [
                    {
                        "editType": "edit",
                        "file": "/abdera/java/trunk/client/src/test/java/org/apache/abdera/test/client/util/MultipartRelatedRequestEntityTest.java"
                    }
                ],
                "revision": 1697770,
                "user": "veithen"
            }
        ],
        "kind": "svn",
        "revisions": [
            {
                "module": "https://svn.apache.org/repos/asf/abdera/java/trunk",
                "revision": 1697770
            }
        ]
    },
    "culprits": [
        {
            "absoluteUrl": "https://builds.apache.org/user/veithen",
            "fullName": "veithen"
        }
    ],
    "mavenArtifacts": {},
    "mavenVersionUsed": "3.0.4"
}

What can I do with it?

In an organization, there can be one or more CI/CD servers (usually Jenkins) managing the day to day builds and deployments of various components or services. We usually see each business unit (or vertical) managing their own Jenkins instance. Any such organization can benefit from treating build events same like any other transactional or master data. Here are some use-cases that these build events can enable.

Configurations

Property	Description	Required?	Default value
connector.class	Class implementing source connector for Jenkins.	Yes	org.aravind.oss.kafka.connect. jenkins.JenkinsSourceConnector
tasks.max		Yes	1
jenkins.base.url	The URL where jenkins server is running	Yes	None
jenkins.pollIntervalInMillis	Frequency (in milliseconds) to poll for new build events in Jenkins	Yes	1 minute
jenkins.username	If your Jenkins is secured, you can provide the username with this property	No	None
jenkins.password.or.api.token	If your Jenkins is secured, you can provide the password or api token with this property	No	None
jenkins.connection.timeoutInMillis	Connection timeout in milliseconds. This denotes the time elapsed before the connection established or Server responded to connection request.	Yes	500
jenkins.read.timeoutInMillis	Response read timeout in milliseconds. After establishing the connection, the client socket waits for response after sending the request. This is the elapsed time since the client has sent request to the server before server responds.	Yes	3000
jenkins.jobs.resource.path	Relative path to REST API	Yes	/api/json
topic	Name of the topic where the Build status records are written to. Make sure you explicitly create this topic using tools provided by Kafka. Do not rely on the default topic creation functionality in PRODUCTION.	Yes	jenkins.connector.topic

How to use it?

Standalone mode

While testing, you might want to run the connector in standalone mode. Follow these steps

1. Download Confluent platform 3.0.0 ZIP file from here
2. Unzip it unzip confluent-3.0.0-2.11.zip
3. Move to Confluent home directory cd confluent-3.0.0
4. Start Zookeeper ./bin/zookeeper-server-start etc/kafka/zookeeper.properties
5. Start Kafka Broker ./bin/kafka-server-start ./etc/kafka/server.properties
6. Clone https://github.com/yaravind/kafka-connect-jenkins.git
7. Run mvn clean install
8. Update the jenkins.base.url property in connect-jenkins-source.properties file with your jenkins base url
9. Add Jenkins connector to classpath and start the connector in standalone mode CLASSPATH=./target/kafka-connect-jenkins-0.5.0-SNAPSHOT-package/share/java/kafka-connect-jenkins/* <<path-to-confluent-home-directory>>/bin/connect-standalone connect-standalone.properties connect-jenkins-source.properties

If you need to proxy to connect to Jenkins then append these to the above command -Dhttp.proxyHost=... -Dhttp.proxyPort=... -Dhttps.proxyHost=... -Dhttps.proxyPort=...

Logging

You can enable the logging for the connector by adding log4j.logger.org.aravind.oss=DEBUG (TRACE) to connect-log4j.properties. Following table can help you with finer level of logging.

Intent	Configuration (DEBUG or TRACE)
Enable logging for Jenkins Source Connector only	log4j.logger.org.aravind.oss.kafka.connect.jenkins.JenkinsSourceConnector=DEBUG log4j.logger.org.aravind.oss.kafka.connect.lib.TaskConfigBuilder=DEBUG
Enable logging for Jenkins Source Task only	log4j.logger.org.aravind.oss.kafka.connect.jenkins.JenkinsSourceTask=DEBUG log4j.logger.org.aravind.oss.kafka.connect.jenkins.ReadYourWritesOffsetStorageAdapter=ERROR log4j.logger.org.aravind.oss.kafka.connect.lib.Partitions=DEBUG
Enable logging for communication with Jenkins API only	log4j.logger.org.aravind.oss.jenkins.JenkinsClient=TRACE

Monitoring

Replace localhost with your server and 8083 with rest.port configuration value.

REST API	Details
http://localhost:8083/	Kafka Connector
http://localhost:8083/connectors/	All deployed connectors
http://localhost:8083/connectors/kafka-jenkins-source-connector/	JenkinsSourceConnector
http://localhost:8083/connectors/kafka-jenkins-source-connector/config	JenkinsSourceConnector config
http://localhost:8083/connectors/kafka-jenkins-source-connector/tasks	JenkinsSourceConnector tasks

Limitations

• Saves only the most recent build (lastBuild) know after configured jenkins.pollIntervalInMillis. i.e. if a Job has been built multiple times within the poll intervals, it isn't accounted for.
• Requires JDK 8 to run the connector. Making JDK 7 compatible version isn't a big deal. Raise an issue if you need one.

Dependencies

• Maven 3.x
• JDK 1.8 or newer
• Spock Framework
• Snap CI for Continuous Integration
• JaCoCo and Coveralls for code coverage
• Codacy to measure code quality

Contribute

• Source code: https://github.com/yaravind/kafka-connect-jenkins
• Issue tracker: https://github.com/yaravind/kafka-connect-jenkins/issues

License

The project is licensed under the Apache 2 license.