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ethereumex

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Elixir JSON-RPC client for the Ethereum blockchain

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ethereumex lib ethereumex http_client.ex
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lib/ethereumex/http_client.ex 

defmodule Ethereumex.HttpClient do

  use Ethereumex.Client.Macro

  import Ethereumex.Config

  @moduledoc false



  @spec single_request(map()) :: {:ok, any() | [any()]} | error

  def single_request(payload) do

    payload

    |> encode_payload

    |> post_request

  end



  @spec encode_payload(map()) :: binary()

  defp encode_payload(payload) do

    payload |> Poison.encode!()

  end



  @spec post_request(binary()) :: {:ok | :error, any()}

  defp post_request(payload) do

    response = rpc_url() |> HTTPoison.post(payload, [{"Content-Type", "application/json"}], Ethereumex.Config.http_options())



    case response do

      {:ok, %HTTPoison.Response{body: body, status_code: code}} ->

        body |> decode_body(code)



      {:error, %HTTPoison.Error{reason: reason}} ->

        {:error, reason}

    end

  end



  @spec decode_body(binary(), integer()) :: {:ok | :error, any()}

  defp decode_body(body, code) do

    decoded_body = body |> Poison.decode!()



    case {code, decoded_body} do

      {200, %{"error" => error}} -> {:error, error}

      {200, result = [%{} | _]} -> {:ok, format_batch(result)}

      {200, %{"result" => result}} -> {:ok, result}

      _ -> {:error, decoded_body}

    end

  end



  @spec format_batch([map()]) :: [map() | nil | binary()]

  defp format_batch(list) do

    list

    |> Enum.sort(fn %{"id" => id1}, %{"id" => id2} ->

      id1 <= id2

    end)

    |> Enum.map(fn %{"result" => result} ->

      result

    end)

  end

end