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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.ReverseProxy.Client.Tesla do
   6   @behaviour Pleroma.ReverseProxy.Client
   7
   8   alias Pleroma.Gun.ConnectionPool
   9
  10   @type headers() :: [{String.t(), String.t()}]
  11   @type status() :: pos_integer()
  12
  13   @spec request(atom(), String.t(), headers(), String.t(), keyword()) ::
  14           {:ok, status(), headers}
  15           | {:ok, status(), headers, map()}
  16           | {:error, atom() | String.t()}
  17           | no_return()
  18
  19   @impl true
  20   def request(method, url, headers, body, opts \\ []) do
  21     check_adapter()
  22
  23     opts = Keyword.put(opts, :body_as, :chunks)
  24
  25     with {:ok, response} <-
  26            Pleroma.HTTP.request(
  27              method,
  28              url,
  29              body,
  30              headers,
  31              opts
  32            ) do
  33       if is_map(response.body) and method != :head do
  34         {:ok, response.status, response.headers, response.body}
  35       else
  36         conn_pid = response.opts[:adapter][:conn]
  37         ConnectionPool.release_conn(conn_pid)
  38         {:ok, response.status, response.headers}
  39       end
  40     else
  41       {:error, error} -> {:error, error}
  42     end
  43   end
  44
  45   @impl true
  46   @spec stream_body(map()) ::
  47           {:ok, binary(), map()} | {:error, atom() | String.t()} | :done | no_return()
  48   def stream_body(%{pid: pid, fin: true}) do
  49     ConnectionPool.release_conn(pid)
  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     ConnectionPool.release_conn(pid)
  75   end
  76
  77   defp check_adapter do
  78     adapter = Application.get_env(:tesla, :adapter)
  79
  80     unless adapter == Tesla.Adapter.Gun do
  81       raise "#{adapter} doesn't support reading body in chunks"
  82     end
  83
  84     adapter
  85   end
  86 end