spheromak/services

#
# Services::Entity:
#  This is the generic 'entity' for anything you want to attach to a service.
# Inherit this for any other type a service may have.
module Services
  require_relative '../services'

  # entity base class.
  # member,service,endpoint are all "services::entity"
  class Entity
    attr_reader :name, :path
    def initialize(name, _args = {})
      @name = name
      validate
    end

    def store
      _store
    end
    alias_method :save, :store

    def load
      _load
    end

    def to_hash
      vars = {}
      instance_variables.each do |name|
        key = name[1..-1].to_s
        # don't store "path"
        next if key == 'path'
        vars[key] =  instance_variable_get(name).to_s
      end
      vars
    end

    private

    def validate
      fail 'This class should be extended. Not used directly' unless path
    end

    def _store
      to_hash.each do |k, v|
        next if k == 'name'
        # etcd doesn't like nil
        v ||= ''
        Services.set "#{KEY}/#{path}/#{k}", value: v
      end
    end

    def _load
      return unless valid_path
      to_hash.each do |k, _v|
        next if k == 'name'
        next unless Services.exists? "#{KEY}/#{path}/#{k}"

        value =  Services.get("#{KEY}/#{path}/#{k}").value
        Etcd::Log.debug "Got #{value} from #{KEY}/#{path}/#{k}"
        instance_variable_set "@#{k}", value
      end
      self
    end

    def valid_path
      Services.exists?("#{KEY}/#{path}")
    end
  end
end