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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

  @moduledoc false



  use Ethereumex.Client.BaseClient

  alias Ethereumex.Config



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

  def post_request(payload, opts) do

    headers = [{"Content-Type", "application/json"}]

    options = [hackney: [pool: :default]] ++ Config.http_options()

    url = Keyword.get(opts, :url) || Config.rpc_url()



    case HTTPoison.post(url, payload, headers, options) do

      {:ok, response} ->

        %HTTPoison.Response{body: body, status_code: code} = response

        decode_body(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

    case Jason.decode(body) do

      {:ok, decoded_body} ->

        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



      {:error, %Jason.DecodeError{data: ""}} ->

        {:error, :empty_response}



      {:error, error} ->

        {:error, {:invalid_json, error}}

    end

  end

end