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+# Pleroma: A lightweight social networking server
+# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
+# SPDX-License-Identifier: AGPL-3.0-only
+
+defmodule Pleroma.ReverseProxy.Client.Tesla do
+ @behaviour Pleroma.ReverseProxy.Client
+
+ alias Pleroma.Gun.ConnectionPool
+
+ @type headers() :: [{String.t(), String.t()}]
+ @type status() :: pos_integer()
+
+ @spec request(atom(), String.t(), headers(), String.t(), keyword()) ::
+ {:ok, status(), headers}
+ | {:ok, status(), headers, map()}
+ | {:error, atom() | String.t()}
+ | no_return()
+
+ @impl true
+ def request(method, url, headers, body, opts \\ []) do
+ check_adapter()
+
+ opts = Keyword.put(opts, :body_as, :chunks)
+
+ with {:ok, response} <-
+ Pleroma.HTTP.request(
+ method,
+ url,
+ body,
+ headers,
+ Keyword.put(opts, :adapter, opts)
+ ) do
+ if is_map(response.body) and method != :head do
+ {:ok, response.status, response.headers, response.body}
+ else
+ conn_pid = response.opts[:adapter][:conn]
+ ConnectionPool.release_conn(conn_pid)
+ {:ok, response.status, response.headers}
+ end
+ else
+ {:error, error} -> {:error, error}
+ end
+ end
+
+ @impl true
+ @spec stream_body(map()) ::
+ {:ok, binary(), map()} | {:error, atom() | String.t()} | :done | no_return()
+ def stream_body(%{pid: pid, fin: true}) do
+ ConnectionPool.release_conn(pid)
+ :done
+ end
+
+ def stream_body(client) do
+ case read_chunk!(client) do
+ {:fin, body} ->
+ {:ok, body, Map.put(client, :fin, true)}
+
+ {:nofin, part} ->
+ {:ok, part, client}
+
+ {:error, error} ->
+ {:error, error}
+ end
+ end
+
+ defp read_chunk!(%{pid: pid, stream: stream, opts: opts}) do
+ adapter = check_adapter()
+ adapter.read_chunk(pid, stream, opts)
+ end
+
+ @impl true
+ @spec close(map) :: :ok | no_return()
+ def close(%{pid: pid}) do
+ ConnectionPool.release_conn(pid)
+ end
+
+ defp check_adapter do
+ adapter = Application.get_env(:tesla, :adapter)
+
+ unless adapter == Tesla.Adapter.Gun do
+ raise "#{adapter} doesn't support reading body in chunks"
+ end
+
+ adapter
+ end
+end