Today I Learned

A Hashrocket project

Serialize an Elixir pid

I was wondering how to serialize/deserialize a pid for some tricks with Ecto Sandbox and I found out some nice code on phoenix_ecto code. Here it goes my version:

defmodule MyApp.Serializer do
  @spec serialize(term) :: binary
  def serialize(term) do
    term
    |> :erlang.term_to_binary()
    |> Base.url_encode64()
  end

  @spec deserialize(binary) :: term
  def deserialize(str) when is_binary(str) do
    str
    |> Base.url_decode64!()
    |> :erlang.binary_to_term()
  end
end

And the test:

defmodule MyApp.SerializerTest do
  use ExUnit.Case, async: true

  alias MyApp.Serializer

  describe "serialize/1" do
    test "serializes a pid" do
      pid = self()
      assert pid |> Serializer.serialize() |> is_binary()
    end

    test "serializes a map" do
      map = %{foo: :bar}
      assert map |> Serializer.serialize() |> is_binary()
    end
  end

  describe "serialize/1, deserialize/1" do
    test "serializes and deserializes a pid" do
      pid = self()
      assert pid |> Serializer.serialize() |> Serializer.deserialize() == pid
    end

    test "serializes and deserializes a map" do
      map = %{foo: :bar}
      assert map |> Serializer.serialize() |> Serializer.deserialize() == map
    end
  end
end
Looking for help? At Hashrocket, we 💜 Elixir! From our many Elixir client projects, to sponsoring the Chicago Elixir Meetup, to the source code for this application, we are invested in this community. Contact us today to talk about your Elixir project.