hiot-kafka/handleEnvelope.js

hiot-app middleware to bootstrap kafka

// Expects a callback argument which returns a promise.
// Uses that promise to call either `ack` or `reject` on the envelope

module.exports = (callback, options, logger, handleError) => {
  let baseLogDetails = { label: "hiot-kafka-handle-envelope" };

  logger.info(baseLogDetails, "Setting up handler");

  return (envelope) => {
    baseLogDetails.topic = envelope.topic;

    logger.info(
      baseLogDetails,
      `Received message for topic: ${envelope.topic}`
    );

    return callback(envelope.message, options)
      .then((metadata) => {
        logger.info(
          { ...baseLogDetails, status: "ack", metadata },
          `Received success for ${envelope.topic}`
        );

        envelope.ack();
      })
      .catch((err) => {
        logger.fatal(
          {
            ...baseLogDetails,
            status: "reject",
            message: envelope.message,
            err: { message: err.message, stack: err.stack },
          },
          `Got error processing ${envelope.topic}`
        );

        handleError(err, { extra: { envelope } });

        envelope.reject();
      });
  };
};