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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.ReverseProxy.Client.Tesla do
   6   @type headers() :: [{String.t(), String.t()}]
   7   @type status() :: pos_integer()
   8
   9   @behaviour Pleroma.ReverseProxy.Client
  10
  11   @spec request(atom(), String.t(), headers(), String.t(), keyword()) ::
  12           {:ok, status(), headers}
  13           | {:ok, status(), headers, map()}
  14           | {:error, atom() | String.t()}
  15           | no_return()
  16
  17   @impl true
  18   def request(method, url, headers, body, opts \\ []) do
  19     _adapter = check_adapter()
  20
  21     with opts <- Keyword.merge(opts, body_as: :chunks, mode: :passive),
  22          {:ok, response} <-
  23            Pleroma.HTTP.request(
  24              method,
  25              url,
  26              body,
  27              headers,
  28              Keyword.put(opts, :adapter, opts)
  29            ) do
  30       if is_map(response.body) and method != :head do
  31         {:ok, response.status, response.headers, response.body}
  32       else
  33         {:ok, response.status, response.headers}
  34       end
  35     else
  36       {:error, error} -> {:error, error}
  37     end
  38   end
  39
  40   @impl true
  41   @spec stream_body(map()) :: {:ok, binary(), map()} | {:error, atom() | String.t()} | :done
  42   def stream_body(%{pid: pid, opts: opts, fin: true}) do
  43     # if connection was sended and there were redirects, we need to close new conn - pid manually
  44     if opts[:old_conn], do: Tesla.Adapter.Gun.close(pid)
  45     # if there were redirects we need to checkout old conn
  46     conn = opts[:old_conn] || opts[:conn]
  47
  48     if conn, do: :ok = Pleroma.Pool.Connections.checkout(conn, self(), :gun_connections)
  49
  50     :done
  51   end
  52
  53   def stream_body(client) do
  54     case read_chunk!(client) do
  55       {:fin, body} ->
  56         {:ok, body, Map.put(client, :fin, true)}
  57
  58       {:nofin, part} ->
  59         {:ok, part, client}
  60
  61       {:error, error} ->
  62         {:error, error}
  63     end
  64   end
  65
  66   defp read_chunk!(%{pid: pid, stream: stream, opts: opts}) do
  67     adapter = check_adapter()
  68     adapter.read_chunk(pid, stream, opts)
  69   end
  70
  71   @impl true
  72   @spec close(map) :: :ok | no_return()
  73   def close(%{pid: pid}) do
  74     adapter = check_adapter()
  75     adapter.close(pid)
  76   end
  77
  78   defp check_adapter do
  79     adapter = Application.get_env(:tesla, :adapter)
  80
  81     unless adapter == Tesla.Adapter.Gun do
  82       raise "#{adapter} doesn't support reading body in chunks"
  83     end
  84
  85     adapter
  86   end
  87 end