| # Camel-Kafka-connector Slack Source |
| |
| This is an example for Camel-Kafka-connector Slack Source |
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| ## Standalone |
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| ### What is needed |
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| - A Slack app |
| - A Slack channel |
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| ### Setting up Slack |
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| You'll need a workspace and a channel. |
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| In your Slack settings, create an app. |
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| Add the following permissions to your Bot Token scopes: |
| * channels:history |
| * channels:read |
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| Install the app on your workspace and select the channel you want to consume from. |
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| Use the Bot User OAuth Access Token as token for this example. |
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| ### Running Kafka |
| |
| ``` |
| $KAFKA_HOME/bin/zookeeper-server-start.sh $KAFKA_HOME/config/zookeeper.properties |
| $KAFKA_HOME/bin/kafka-server-start.sh $KAFKA_HOME/config/server.properties |
| $KAFKA_HOME/bin/kafka-topics.sh --create --bootstrap-server localhost:9092 --replication-factor 1 --partitions 1 --topic mytopic |
| ``` |
| |
| ### Setting up the needed bits and running the example |
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| You'll need to setup the plugin.path property in your kafka |
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| Open the `$KAFKA_HOME/config/connect-standalone.properties` |
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| and set the `plugin.path` property to your choosen location |
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| In this example we'll use `/home/oscerd/connectors/` |
| |
| ``` |
| > cd /home/oscerd/connectors/ |
| > wget https://repo1.maven.org/maven2/org/apache/camel/kafkaconnector/camel-slack-kafka-connector/0.10.0/camel-slack-kafka-connector-0.10.0-package.tar.gz |
| > untar.gz camel-slack-kafka-connector-0.10.0-package.tar.gz |
| ``` |
| |
| Now it's time to setup the connectors |
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| Open the Slack source configuration file |
| |
| ``` |
| name=CamelSlackSourceConnector |
| connector.class=org.apache.camel.kafkaconnector.slack.CamelSlackSourceConnector |
| key.converter=org.apache.kafka.connect.storage.StringConverter |
| transforms=SlackTransformer |
| transforms.SlackTransformer.type=org.apache.camel.kafkaconnector.slack.transformers.SlackTransforms |
| |
| topics=mytopic |
| |
| camel.source.path.channel=general |
| camel.source.endpoint.token=<the token created for your Bot> |
| ``` |
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| Now you can run the example |
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| ``` |
| $KAFKA_HOME/bin/connect-standalone.sh $KAFKA_HOME/config/connect-standalone.properties config/CamelSlackSourceConnector.properties |
| ``` |
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| Add messages to your channel for example "Hello" |
| |
| In another terminal, using kafkacat, you should be able to see the headers. |
| |
| ``` |
| > kafkacat -b localhost:9092 -t mytopic -f 'Topic %t[%p], offset: %o, key: %k, payload: %s \n' |
| Topic test301[0], offset: 22, key: , payload: {"schema":{"type":"string","optional":false},"payload":"Hello"} |
| ``` |
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| ## Openshift |
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| ### What is needed |
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| - A Slack App |
| - A Slack channel |
| - An Openshift instance |
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| ### Running Kafka using Strimzi Operator |
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| First we install the Strimzi operator and use it to deploy the Kafka broker and Kafka Connect into our OpenShift project. |
| We need to create security objects as part of installation so it is necessary to switch to admin user. |
| If you use Minishift, you can do it with the following command: |
| |
| [source,bash,options="nowrap"] |
| ---- |
| oc login -u system:admin |
| ---- |
| |
| We will use OpenShift project `myproject`. |
| If it doesn't exist yet, you can create it using following command: |
| |
| [source,bash,options="nowrap"] |
| ---- |
| oc new-project myproject |
| ---- |
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| If the project already exists, you can switch to it with: |
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| [source,bash,options="nowrap"] |
| ---- |
| oc project myproject |
| ---- |
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| We can now install the Strimzi operator into this project: |
| |
| [source,bash,options="nowrap",subs="attributes"] |
| ---- |
| oc apply -f https://github.com/strimzi/strimzi-kafka-operator/releases/download/0.20.1/strimzi-cluster-operator-0.20.1.yaml |
| ---- |
| |
| Next we will deploy a Kafka broker cluster and a Kafka Connect cluster and then create a Kafka Connect image with the Debezium connectors installed: |
| |
| [source,bash,options="nowrap",subs="attributes"] |
| ---- |
| # Deploy a single node Kafka broker |
| oc apply -f https://github.com/strimzi/strimzi-kafka-operator/raw/0.20.1/examples/kafka/kafka-persistent-single.yaml |
| |
| # Deploy a single instance of Kafka Connect with no plug-in installed |
| oc apply -f https://github.com/strimzi/strimzi-kafka-operator/raw/0.20.1/examples/connect/kafka-connect-s2i-single-node-kafka.yaml |
| ---- |
| |
| Optionally enable the possibility to instantiate Kafka Connectors through specific custom resource: |
| [source,bash,options="nowrap"] |
| ---- |
| oc annotate kafkaconnects2is my-connect-cluster strimzi.io/use-connector-resources=true |
| ---- |
| |
| ### Add Camel Kafka connector binaries |
| |
| Strimzi uses `Source2Image` builds to allow users to add their own connectors to the existing Strimzi Docker images. |
| We now need to build the connectors and add them to the image, |
| if you have built the whole project (`mvn clean package`) decompress the connectors you need in a folder (i.e. like `my-connectors/`) |
| so that each one is in its own subfolder |
| (alternatively you can download the latest officially released and packaged connectors from maven): |
| |
| So we need to do something like this: |
| |
| ``` |
| > cd my-connectors/ |
| > wget https://repo1.maven.org/maven2/org/apache/camel/kafkaconnector/camel-slack-kafka-connector/0.10.0/camel-slack-kafka-connector-0.10.0-package.tar.gz |
| > untar.gz camel-slack-kafka-connector-0.10.0-package.tar.gz |
| ``` |
| |
| Now we can start the build |
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| [source,bash,options="nowrap"] |
| ---- |
| oc start-build my-connect-cluster-connect --from-dir=./my-connectors/ --follow |
| ---- |
| |
| We should now wait for the rollout of the new image to finish and the replica set with the new connector to become ready. |
| Once it is done, we can check that the connectors are available in our Kafka Connect cluster. |
| Strimzi is running Kafka Connect in a distributed mode. |
| |
| To check the available connector plugins, you can run the following command: |
| |
| [source,bash,options="nowrap"] |
| ---- |
| oc exec -i `oc get pods --field-selector status.phase=Running -l strimzi.io/name=my-connect-cluster-connect -o=jsonpath='{.items[0].metadata.name}'` -- curl -s http://my-connect-cluster-connect-api:8083/connector-plugins |
| ---- |
| |
| You should see something like this: |
| |
| [source,json,options="nowrap"] |
| ---- |
| [{"class":"org.apache.camel.kafkaconnector.CamelSinkConnector","type":"sink","version":"0.10.0"},{"class":"org.apache.camel.kafkaconnector.CamelSourceConnector","type":"source","version":"0.10.0"},{"class":"org.apache.camel.kafkaconnector.slack.CamelSlackSinkConnector","type":"sink","version":"0.10.0"},{"class":"org.apache.camel.kafkaconnector.slack.CamelSlackSourceConnector","type":"source","version":"0.10.0"},{"class":"org.apache.kafka.connect.file.FileStreamSinkConnector","type":"sink","version":"2.5.0"},{"class":"org.apache.kafka.connect.file.FileStreamSourceConnector","type":"source","version":"2.5.0"},{"class":"org.apache.kafka.connect.mirror.MirrorCheckpointConnector","type":"source","version":"1"},{"class":"org.apache.kafka.connect.mirror.MirrorHeartbeatConnector","type":"source","version":"1"},{"class":"org.apache.kafka.connect.mirror.MirrorSourceConnector","type":"source","version":"1"}] |
| ---- |
| |
| ### Set the Bot Token as secret (optional) |
| |
| You can also set the token option as secret, you'll need to edit the file config/slack-token.properties with the correct credentials and then execute the following command |
| |
| [source,bash,options="nowrap"] |
| ---- |
| oc create secret generic slack-token --from-file=config/openshift/slack-token.properties |
| ---- |
| |
| Now we need to edit KafkaConnectS2I custom resource to reference the secret. For example: |
| |
| [source,bash,options="nowrap"] |
| ---- |
| spec: |
| # ... |
| config: |
| config.providers: file |
| config.providers.file.class: org.apache.kafka.common.config.provider.FileConfigProvider |
| #... |
| externalConfiguration: |
| volumes: |
| - name: slack-token |
| secret: |
| secretName: slack-token |
| ---- |
| |
| In this way the secret slack-token will be mounted as volume with path /opt/kafka/external-configuration/slack-token/ |
| |
| ### Create connector instance |
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| Now we can create some instance of the Slack source connector: |
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| [source,bash,options="nowrap"] |
| ---- |
| oc exec -i `oc get pods --field-selector status.phase=Running -l strimzi.io/name=my-connect-cluster-connect -o=jsonpath='{.items[0].metadata.name}'` -- curl -X POST \ |
| -H "Accept:application/json" \ |
| -H "Content-Type:application/json" \ |
| http://my-connect-cluster-connect-api:8083/connectors -d @- <<'EOF' |
| { |
| "name": "slack-source-connector", |
| "config": { |
| "connector.class": "org.apache.camel.kafkaconnector.slack.CamelSlackSourceConnector", |
| "tasks.max": "1", |
| "key.converter": "org.apache.kafka.connect.storage.StringConverter", |
| "transforms": "SlackTransformer", |
| "transforms.SlackTransformer.type": "org.apache.camel.kafkaconnector.slack.transformers.SlackTransforms", |
| "topics": "slack-topic", |
| "camel.source.path.channel": "general", |
| "camel.source.endpoint.token": "<token>" |
| } |
| } |
| EOF |
| ---- |
| |
| Altenatively, if have enabled `use-connector-resources`, you can create the connector instance by creating a specific custom resource: |
| |
| [source,bash,options="nowrap"] |
| ---- |
| oc apply -f - << EOF |
| apiVersion: kafka.strimzi.io/v1alpha1 |
| kind: KafkaConnector |
| metadata: |
| name: slack-source-connector |
| namespace: myproject |
| labels: |
| strimzi.io/cluster: my-connect-cluster |
| spec: |
| class: org.apache.camel.kafkaconnector.slack.CamelSlackSourceConnector |
| tasksMax: 1 |
| config: |
| key.converter: org.apache.kafka.connect.storage.StringConverter |
| transforms: SlackTransformer |
| transforms.SlackTransformer.type: org.apache.camel.kafkaconnector.slack.transformers.SlackTransforms |
| topics: slack-topic |
| camel.source.path.channel: general |
| camel.source.endpoint.token: token |
| EOF |
| ---- |
| |
| If you followed the optional step for secret webhook you can run the following command: |
| |
| [source,bash,options="nowrap"] |
| ---- |
| oc apply -f config/openshift/slack-source.yaml |
| ---- |
| |
| Add messages to your channel for example "Hello" |
| |
| Using kafkacat, you should be able to see the headers. |
| |
| ``` |
| > kafkacat -b localhost:9092 -t mytopic -f 'Topic %t[%p], offset: %o, key: %k, payload: %s \n' |
| Topic test301[0], offset: 22, key: , payload: {"schema":{"type":"string","optional":false},"payload":"Hello"} |
| ``` |
| |