git.squeep.com Git - akkoma/blob - lib/pleroma/reverse_proxy/client/tesla.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 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              Keyword.put(opts, :adapter, 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, opts: opts, fin: true}) do
  49     # if connection was reused, but in tesla were redirects,
  50     # tesla returns new opened connection, which must be closed manually
  51     if opts[:old_conn], do: Tesla.Adapter.Gun.close(pid)
  52     # if there were redirects we need to checkout old conn
  53     conn = opts[:old_conn] || opts[:conn]
  54
  55     if conn, do: :ok = ConnectionPool.release_conn(conn)
  56
  57     :done
  58   end
  59
  60   def stream_body(client) do
  61     case read_chunk!(client) do
  62       {:fin, body} ->
  63         {:ok, body, Map.put(client, :fin, true)}
  64
  65       {:nofin, part} ->
  66         {:ok, part, client}
  67
  68       {:error, error} ->
  69         {:error, error}
  70     end
  71   end
  72
  73   defp read_chunk!(%{pid: pid, stream: stream, opts: opts}) do
  74     adapter = check_adapter()
  75     adapter.read_chunk(pid, stream, opts)
  76   end
  77
  78   @impl true
  79   @spec close(map) :: :ok | no_return()
  80   def close(%{pid: pid}) do
  81     ConnectionPool.release_conn(pid)
  82   end
  83
  84   defp check_adapter do
  85     adapter = Application.get_env(:tesla, :adapter)
  86
  87     unless adapter == Tesla.Adapter.Gun do
  88       raise "#{adapter} doesn't support reading body in chunks"
  89     end
  90
  91     adapter
  92   end
  93 end