Synchronous .produce about node-rdkafka

[webmakersteve]

#98 Adds support for using opaques like so

producer.produce(topic', partition, message, key, { messageId: 20 });

producer.on('delivery-report', (err, report) => {
   if (report.opaque && report.opaque.messageId === 20) {
      // we got it
   }
});

[webmakersteve]

The reason produce is synchronous is because it is a non blocking call. What it does is add your message to librdkafka's internal queue buffer. Then, those messages are sent a time later when librdkafka produces its batch of messages.

The delivery-report event is intended to tell you that a delivery succeeded or failed. You can correlate the message that failed or succeeded using the information passed to your callback. You can correlate the message currently using the payload, but I am going to add an opaque that you can use instead in a future release.

producer.on('delivery-report', (err, report) => {
const payload = report.value;
});

For the payload to show up, you will need to add dr_msg_cb: true to your producer config.

acks is an alias to request.required.acks. You can use either one and it should work.