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Set up Message Rest API

Before using Rest API, you need to complete the following setup steps.

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Step 1: Create a service account

Currently, you can’t edit a service account. If you need a service account to have Super Admin access, make sure to enable it when creating the service account. By default, service accounts do not have Super Admin enabled.

To create a service account, follow these steps.

  1. On the left navigation pane, click Service Accounts.

  2. Click Create Service Account.

  3. (Optional) Select Super Admin to grant the service account with Super admin access to a namespace or tenant.

  4. Enter a name for the service account, and then click Confirm.

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Step 2: Create an API key of your service account

Before using an API key, verify that the service account is authorized to access the resources, such as tenants, namespaces, and topics.

You can follow the instructions to create an API key for the service account you choose to use.

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Step 3: Grant service account permissions

If you use a Super Admin service account, you can skip this step because a Super Admin service account has the required permissions already.

  1. On the left navigation pane, in the Admin section, click Tenants/Namespaces.

  2. Select the Public tenant, then select the Default namespace under the tenant.

  3. Select the POLICY tab.

  4. In the Authorization area, click ADD ROLE, and select the name of the service account you just created in the previous section.

  5. In the Authorization area, on the drop-down menu below the service name you just added, select the consume and produce roles. The roles are added to your service account.

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Step 4: Get the HTTP Service URL of your StreamNative cluster

To get the service URL(s) of a StreamNative cluster, follow these steps.

  1. Navigate to the Cluster Dashboard page by switching to the cluster workspace.

  2. On the Cluster Dashboard page, click Details tab.

  3. You will see the available service URLs in the Access Points area.

  4. You can click Copy at the end of the row of the service URL that you want to use.

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Work with Message Rest API

Rest API does not validate the data schema and directly stores the accepted binary data into a topic. You should ensure the correctness of the data schema to ensure compatibility with the Pulsar client in other languages.

After you have completed the configuration steps above, you can use Rest API to produce and consume messages. Rest API sends binary data. You can use the cURL tool to encode a string (for example Hi Pulsar) into UTF-8 format bytes. To send bytes in another format, you need to specify an appropriate file. For more information, see the cURL documentation.

  1. Create a subscription on the topic.

    script
    curl -X PUT https://<endpoint>:<port>/admin/v2/persistent/public/default/rest-topic/subscription/rest-sub \
  --header 'Authorization: Bearer <API Key>' \
  --header 'Accept: application/json' \
  --header 'Content-Type: application/json'

    You should see the following output:

    script
    # No content response

  2. Produce messages to the topic.

    script
    curl -X POST https://<endpoint>:<port>/admin/rest/topics/v1/persistent/public/default/rest-topic/message \
  --header 'Authorization: Bearer <API Key>' \
  --header 'Accept: application/json' \
  --header 'Content-Type: application/octet-stream' \
  --data-binary 'Hi, Pulsar'

    You should see the following output:

    script
    # Message id in string format
10:0:-1:0

  3. Consume messages from the topic.

    script
    curl -X POST https://<endpoint>:<port>/admin/rest/topics/v1/persistent/public/default/rest-topic/rest-sub/message \
  --header 'Authorization: Bearer <API Key>' \
  --header 'Accept: application/octet-stream' \
  --header 'Content-Type: application/json' -v

    You should see the following output:

    script
    # Headers
X-Pulsar-Message-Id: CAoQACAAMAE=
X-Pulsar-Message-String-Id: 10:0:-1:0
X-Pulsar-Sequence-Id: 0

# Body
Hi, Pulsar

  4. Acknowledge messages.

    script
    curl -X PUT https://<endpoint>:<port>/admin/rest/topics/v1/persistent/public/default/rest-topic/rest-sub/message \
  --header 'Authorization: Bearer <API Key>' \
  --header 'Accept: application/json' \
  --header 'Content-Type: application/json' \
  --data-raw 'CAoQACAAMAE='

    You should see the following output:

    script
    # No content response

  5. Negative acknowledge messages.

    script
    curl -X PUT https://<endpoint>:<port>/admin/rest/topics/v2/persistent/public/default/rest-topic/rest-sub/message \
  --header 'Authorization: Bearer <API Key>' \
  --header 'Accept: application/json' \
  --header 'Content-Type: application/json' \
  --data-raw '{"encodedMessageId":"CAoQACAAMAE=","negativeAck":"true"}'

    You should see the following output:

    script
    # No content response

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Message Rest API reference

For further information, see Message Rest API reference.