EMx 024: “Sagas” with Andrew Dryga from Hammer Corporation

Panel: Mark EricksenEric BerryJosh AdamsNathan Hopkins Special Guest: Andrew Dryga In this episode of Elixir Mix, the panel talks with Andrew Dryga who is a software engineer (full-stack), entrepreneur, blockchain architect, and consultant. He currently works for Hammer and previous employers include Contractbook, Nebo #15, BEST Money Transfers among others. He studied at the National Technical University of Ukraine. Check out today’s episode where the panel and guest talk about Sagas and Sage. Show Topics: 1:52 – Our guest today is Andrew Dryga. Why are you into Elixir? 2:04 – Andrew: I have worked in Elixir for a few years. I worked on one of the biggest opensource projects for a while now. 2:42 – Let’s talk about Sage! 2:49 – Andrew: I felt like I was doing the same thing over, and over again. Andrew talks about how he was on a mission to solve a problem that he was having. 3:48 – Panelist: I have run into this problem before, and I am looking forward We have distribution systems and anything that is external for us (Stripe), and one of the solutions was to create a multi. Let’s create a user, register theses different pieces, and then... Then we realized that this request was taking too long. Our transaction is timing out. The other connection went to the other server. We had database records removed from the other side. People aren’t aware that they have these distribution problems. I think Stripe is a good example of that. I started with my multi... 5:24 – Andrew: I am trying to be very programmatic. I don’t want to do that, so write now the project is multi. It’s doable if you know what you are doing. If you are dealing with just one it’s simple. But if you can monitor them (Sage Read Me)... 56:16 – Let’s talk about Sagas! 6:19 – Andrew talks about what Sagas are. 8:20 – You are right it is a new mental model. That’s why I love the Sage library because it is simple. It gives structure to that mental model. The idea that I will take step one and create a user, step two another entry, step three now an external entry. It can fail for any reason. Then these compensating functions are saying: what is the undo for this? It could be just delete this specific entry. But do I have that right? 9:53 – Andrew gives his comments on those comments. 10:26 – Andrew continues his ideas. 11:09 – When you start with a new team, you don’t bring Sage right off the back? What is your strategy to figure out that pain? 11:32 – Andrew: I don’t have a plan – how do I feel about THAT coder. After about 2 services and 1 call it’s time to use Sage or it will be too complex. Integration is the case. So if you try to integrate substitution then... 12:29 – Question to Andrew. 12:35 – Andrew: Figure it out by judgment and it varies by situation. I enjoy working with them but I’m not like them. I use my best judgment. 12:59 – You talked at Code Beam and talked about Sagas and Sage. I think that’s a good resource to defend you case. To talk about the sequence of events, something goes wrong, and then rollback the changes. What feedback have you received? 13:46 – Andrew: Yes, good feedback. There some people will say that there are problems, but I know there are companies that are actively using it. People say that it simplifies their projects. I think the presentation slides can definitely help. 14:39 – Yes, check out the show notes links. 14:45 – Are you a consultant or are you fulltime? 14:53 – Andrew: I used to be fulltime and do large projects for companies. Andrew talks about those projects in detail. Andrew: Those projects we...