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nerves lib nerves utils http_client.ex
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lib/nerves/utils/http_client.ex 

defmodule Nerves.Utils.HTTPClient do

  use GenServer



  @timeout 120_000

  @progress_steps 50



  def start_link() do

    {:ok, _} = Application.ensure_all_started(:nerves)

    start_httpc()

    GenServer.start_link(__MODULE__, [])

  end



  def stop(pid) do

    GenServer.stop(pid)

  end



  def get(pid, url) do

    GenServer.call(pid, {:get, url}, @timeout)

  end



  def init([]) do

    {:ok, %{

      url: nil,

      content_length: 0,

      buffer: "",

      buffer_size: 0,

      filename: "",

      caller: nil

    }}

  end



  def handle_call({:get, url}, from, s) do



    headers = [

      {'Content-Type', 'application/octet-stream'}

    ]



    http_opts = [timeout: @timeout, autoredirect: true] ++ Nerves.Utils.Proxy.config(url)

    opts = [stream: :self, receiver: self(), sync: false]

    :httpc.request(:get, {String.to_char_list(url), headers}, http_opts, opts, :nerves)

    {:noreply, %{s | url: url, caller: from}}

  end



  def handle_info({:http, {_, :stream_start, headers}}, s) do

    {_, content_length} =

      headers

      |> Enum.find(fn({key, _}) -> key == 'content-length' end)



    {content_length, _} =

      content_length

      |> to_string()

      |> Integer.parse()



    {_, filename} =

      headers

      |> Enum.find(fn({key, _}) -> key == 'content-disposition' end)

    filename =

      filename

      |> to_string

      |> String.split(";")

      |> List.last

      |> String.strip

      |> String.trim("filename=")

    {:noreply, %{s | content_length: content_length, filename: filename}}

  end



  def handle_info({:http, {_, :stream, data}}, s) do

    size = byte_size(data) + s.buffer_size

    buffer = s.buffer <> data

    put_progress(size, s.content_length)

    {:noreply, %{s | buffer_size: size, buffer: buffer}}

  end



  def handle_info({:http, {_, :stream_end, _headers}}, s) do

    IO.write(:stderr, "\n")

    GenServer.reply(s.caller, {:ok, s.buffer})

    {:noreply, %{s | filename: "", content_length: 0, buffer: "", buffer_size: 0, url: nil}}

  end



  def put_progress(size, max) do

    fraction = (size / max)

    completed = trunc(fraction * @progress_steps)

    percent = trunc(fraction * 100)

    unfilled = @progress_steps - completed

    IO.write(:stderr, "\r|#{String.duplicate("=", completed)}#{String.duplicate(" ", unfilled)}| #{percent}% (#{bytes_to_mb(size)} / #{bytes_to_mb(max)}) MB")

  end



  defp start_httpc() do

    :inets.start(:httpc, profile: :nerves)

    opts = [

      max_sessions: 8,

      max_keep_alive_length: 4,

      max_pipeline_length: 4,

      keep_alive_timeout: 120_000,

      pipeline_timeout: 60_000

    ]

    :httpc.set_options(opts, :nerves)

  end



  defp bytes_to_mb(bytes) do

    trunc(bytes / 1024 / 1024)

  end

end