tonyhb

name: Build & Test

on:
  push:
    branches: [ develop, master ]
  pull_request:
    branches: [ develop, master ]

jobs:

tonyhb

I've been planning out an event sourcing like system for our healthtech startup, and you're definitely right re namespacing and versioning.

I explicitly keep a version in the event - which is a date. It's similar in how Stripe versions their API. We're also planning to handle the events in the same way as stripe's API: each event has side effects; the side effects may change depending on the version and each version has its own application logic (cascading, so you can have 2018-08-01 run all of 2018-07-30 plus its own changes).

This lets us replay events as they happened, run an event using two different versions and perform only the diffs etc.

Our system is probably not a typical CQRS/event sourcing setup.

The event system itself idempotent: you take an event with all input data necessary to run the event (form data, necessary current state), so the system can run independently. This means that every event is typed such that the input data dictates what is necessary.

tonyhb

04bcdf33e02091a0cb21a18e2d66c9bb886b7fe6e7c04c78ff927da0a96f7d05da2e27014611ae48299b93c31157fe06b53173cf8d5188cf3f00ed05b5f86d11e4

tonyhb

/* result represents either a success or an error for an operation.  It can hold
   a resource of any type - ie. a user, treatment etc. */
type result('resource) =
  | Ok('resource)
  | Error('resource, string);

/* Event represents a single event within our system */
type event('data, 'resource) = {
  /* The ID of the user authoring the event */
  author: string,

tonyhb

{ pkgs ? import <nixpkgs> {} }:
 
let 
  jdk = pkgs.jdk8;
  androidsdk = pkgs.androidenv.androidsdk_6_0_extras;
  fhs = pkgs.buildFHSUserEnv {
    name = "android-env";
    targetPkgs = pkgs: with pkgs; [ 
      androidsdk
      bash

tonyhb

# Install kernel 4.14
echo 'deb http://http.debian.net/debian stretch-backports main' | sudo tee /etc/apt/sources.list.d/stretch-backports.list
sudo apt-get update
sudo apt-get -t stretch-backports install linux-image-amd64

# Install Docker
sudo apt-get -y install \
  apt-transport-https \
  ca-certificates \
  curl \

tonyhb

package models

import (
	"github.com/jmoiron/sqlx"
	"github.com/tonyhb/govalidate"
)

type Page struct {
	Id   int64
	Name string

tonyhb

# spec/support/click.rb

module Capybara
  module Node
    class Element < Base

      # Override the default implementation of click so that whenever we click
      # on something, we also wait for any ajax requests to finish.
      def click
        synchronize { base.click }

tonyhb

// By assigning next to a variable we can swap out the hello() function in testing with a custom
// implementation
var h = hello                                                                                                                                                           

func main() {
	fmt.Println(n())
}

func hello() string {

tonyhb

set nocompatible               " be iMproved
filetype off                   " required!

set rtp+=~/.vim/bundle/vundle/
call vundle#rc()

Bundle 'gmarik/vundle'

" Plugins here