Nathan myobie

Building new.space

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myobie / some_app_migration.ex

Created July 28, 2017 14:20

UTC Timestamps and Paranoid Delete for Ecto Elixir Projects

	defmodule SomeApp.Migration do
	defmacro __using__(_) do
	quote do
	import Ecto.Migration, except: [timestamps: 0, timestamps: 1]
	@disable_ddl_transaction false
	import unquote(__MODULE__)
	@before_compile Ecto.Migration
	end
	end

myobie / multi_vm_testing_examples.ex

Created June 27, 2017 09:40

	# how to boot a new VM process
	def spawn do
	:net_kernel.start([:"primary@127.0.0.1"])
	:erl_boot_server.start([])
	allow_boot to_char_list("127.0.0.1")

	Application.get_env(:highlander,
	:spawn_nodes, [])
	\|> Enum.map(&Task.async(fn ->
	{:ok, _node} = spawn_node(&1)

myobie / user_and_list.ex

Created June 27, 2017 09:36

An example of how users and lists could know about each other

	defmodule User do
	use Highlander.Object, type: :user

	defobject name: "", email: "", known_lists: []
	end

	defmodule List do
	use Highlander.Object, type: :list

	defobject title: "", todos: [], allowed_users: []

myobie / list_and_todo.ex

Created June 27, 2017 09:33

An example of a shared list with some todos

	defmodule List do
	use Highlander.Object, type: :list

	defobject title: "", todos: []
	end

	defmodule Todo do
	defstruct title: "", completed: false, color: :blue
	end

myobie / user.ex

Created June 27, 2017 09:19

An example user module using highlander

	defmodule User do
	use Highlander.Object, type: :user

	defobject name: "", email: ""
	end

myobie / todo_usage_example.ex

Created June 27, 2017 09:09

How to use the todo.ex highlander object

	id = UUID.uuid4()

	{:ok, todo} = Todo.get id

	assert todo.completed == false
	assert todo.title == ""
	assert todo.color == :blue

	todo = %{todo \| title: "Hello"}

myobie / todo.ex

Last active June 27, 2017 09:20

An example highlander object - todo

	defmodule Todo do
	use Highlander.Object, type: :todo

	defobject title: "", completed: false, color: :blue
	end

myobie / supervisor_tree_example.ex

Created June 27, 2017 09:01

The example supervisor tree from the highlander project

	opts = [host,
	[stop_on_disconnect: true, name: :zk]]

	children = [
	worker(Zookeeper.Client, opts, []),
	worker(Registry.Server, [], []),
	worker(Registry.NodeCycleServer, [], []),
	supervisor(Object.Supervisor, [], [])
	]

myobie / znode_init_example.ex

Created June 27, 2017 08:57

When creating a new key (modeled as a ZNode here) we use the distributed lock recipe to make sure we can know if we were first to create a key with this particular name

	defmodule ZNode do
	def init(name) do
	{:ok, path} =
	Zookeeper.Client.create(:zk,
	prefix(name, UUID.uuid4(:hex)),
	to_string(Node.self),
	makepath: true,
	create_mode: :ephemeral_sequential)
	{:ok, %{path: path, name: name}}
	end

myobie / zk_create_node_example.ex

Created June 27, 2017 08:56

When creating a new key (node) in zookeeper, we check if we were the first to try and fail accordingly

	defmodule ZK do
	def create_znode(name) do
	{:ok, pid} = ZNode.start_link(name)

	if ZNode.first?(pid) do
	{:ok, pid}
	else
	:ok = ZNode.delete(pid)
	{:error, :already_exists}
	end

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