Practical Microservices

Writing Your First Message

Okay, when we left the record-viewings application, we were in the function that would record that a video was viewed. Here’s where we left off:

first-pass/src/app/record-viewings/index.js

function createActions ({
  db
}) {
  function recordViewing (traceId, videoId) {
  }

  return {
    recordViewing
  }
}

We decidedhere that we’ll use VideoViewed events to record video views. We’ll write these events to streams of the form viewing-X, where X is the video’s ID. So all we need to do in this function is build the event we’re going to write and then write it to the Message Store:

The Code Directory Has Changed
	From this point going forward in the book, the code is in the code/video-tutorials/ folder. If you’re ...