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raft_fleet

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A fleet of Raft consensus groups

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raft_fleet lib raft_fleet nodes_per_zone.ex
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lib/raft_fleet/nodes_per_zone.ex 

use Croma

alias Croma.TypeGen, as: TG



defmodule RaftFleet.NodesPerZone do

  alias RaftFleet.{Hash, ZoneId}

  use Croma.SubtypeOfMap, key_module: ZoneId, value_module: TG.list_of(Croma.Atom)



  defun lrw_members(nodes_per_zone :: t,

                    task_id        :: atom | any, # This is basically a group name (atom) but any ID that can be assigned to node(s) is acceptable

                    n_to_take      :: pos_integer) :: [node] do

    Enum.flat_map(nodes_per_zone, fn {_z, ns} ->

      Enum.map(ns, fn n -> {Hash.calc({n, task_id}), n} end)

      |> Enum.sort()

      |> Enum.map_reduce(0, fn({hash, node}, index) -> {{index, hash, node}, index + 1} end)

      |> elem(0)

    end)

    |> Enum.sort()

    |> Enum.take(n_to_take)

    |> Enum.map(fn {_i, _h, n} -> n end)

  end

end