Lasse Skindstad Ebert lasseebert

Mini project specification

Build a URL shortener API

The following endpoints must be implemented:

Like a pipe operator (|>), but for processes and with back pressure and on coke.

So what is this back-pressure? In short it is "pull" and not "push".

Sample1 demo

Writing code that writes code
In Elixir this could mean:
- Write code outside of functions to define functions or modules
- Implement a macro to manipulate AST at compile time
- Manipulate and evaluate AST at runtime

	# This file contains the configuration for Credo and you are probably reading
	# this after creating it with `mix credo.gen.config`.
	#
	# If you find anything wrong or unclear in this file, please report an
	# issue on GitHub: https://github.com/rrrene/credo/issues
	#
	%{
	#
	# You can have as many configs as you like in the `configs:` field.
	configs: [

	defmodule DecryptPayload do
	@moduledoc """
	Decrypts payload
	"""

	def run(payload_hex, key_hex, iv_hex) do
	payload_bytes = payload_hex \|> Base.decode16!
	key_bytes = key_hex \|> Base.decode16!
	iv_bytes = iv_hex \|> Base.decode16!

	defmodule Legolas.Geolocation do
	@moduledoc """
	Public interface for all geolocation related functionality
	"""

	alias Legolas.Geolocation.Cache
	alias Legolas.Geolocation.CityLocation
	alias Legolas.Geolocation.GoogleMaps.Client

	@type address :: {zip :: String.t, city :: String.t, country :: String.t}

	children = [
	# Many children here
	# ...
	MyProject.Geolocation
	]

	opts = [strategy: :one_for_one, name: MyProject.Supervisor]
	Supervisor.start_link(children, opts)

	alias MyProject.Geolocation.Cache

	def child_spec([]) do
	%{
	id: __MODULE__,
	start: {Cache, :start_link, []}
	}
	end

	@type address :: {zip :: String.t, city :: String.t, country :: String.t}
	@type geolocation :: {latitude :: number, longitude :: number}

	@doc """
	Finds the geolocation for the given address
	"""
	@spec lookup(address) :: {:ok, geolocation} \| {:error, any}
	def lookup(address) do
	# Logic that calls the inner modules
	end