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diff --git a/lib/tesla/client.ex b/lib/tesla/client.ex
index 61cad21..598056f 100644
--- a/lib/tesla/client.ex
+++ b/lib/tesla/client.ex
@@ -1,14 +1,50 @@
defmodule Tesla.Client do
@type adapter :: module | {module, any} | (Tesla.Env.t() -> Tesla.Env.result())
@type middleware :: module | {module, any}
@type t :: %__MODULE__{
pre: Tesla.Env.stack(),
post: Tesla.Env.stack(),
adapter: adapter | nil
}
defstruct fun: nil,
pre: [],
post: [],
adapter: nil
+
+ @doc ~S"""
+ Returns the client's adapter in the same form it was provided.
+ This can be used to copy an adapter from one client to another.
+
+ ## Example
+
+ iex> client = Tesla.client([], {Tesla.Adapter.Hackney, [recv_timeout: 30_000]})
+ iex> Tesla.Client.adapter(client)
+ {Tesla.Adapter.Hackney, [recv_timeout: 30_000]}
+ """
+ @spec adapter(t) :: adapter
+ def adapter(client) do
+ unruntime(client.adapter)
+ end
+
+ @doc ~S"""
+ Returns the client's middleware in the same form it was provided.
+ This can be used to copy middleware from one client to another.
+
+ ## Example
+
+ iex> middleware = [Tesla.Middleware.JSON, {Tesla.Middleware.BaseUrl, "https://api.github.com"}]
+ iex> client = Tesla.client(middleware)
+ iex> Tesla.Client.middleware(client)
+ [Tesla.Middleware.JSON, {Tesla.Middleware.BaseUrl, "https://api.github.com"}]
+ """
+ @spec middleware(t) :: [middleware]
+ def middleware(client) do
+ unruntime(client.pre)
+ end
+
+ defp unruntime(list) when is_list(list), do: Enum.map(list, &unruntime/1)
+ defp unruntime({module, :call, [[]]}) when is_atom(module), do: module
+ defp unruntime({module, :call, [opts]}) when is_atom(module), do: {module, opts}
+ defp unruntime({:fn, fun}) when is_function(fun), do: fun
end
diff --git a/test/tesla/client_test.exs b/test/tesla/client_test.exs
index 8bfda1a..fc2ba5f 100644
--- a/test/tesla/client_test.exs
+++ b/test/tesla/client_test.exs
@@ -1,4 +1,46 @@
defmodule Tesla.ClientTest do
use ExUnit.Case
doctest Tesla.Client
+
+ describe "Tesla.Client.adapter/1" do
+ test "converts atom adapter properly" do
+ adapter = Tesla.Adapter.Httpc
+
+ client = Tesla.client([], adapter)
+
+ assert adapter == Tesla.Client.adapter(client)
+ end
+
+ test "converts tuple adapter properly" do
+ adapter = {Tesla.Adapter.Hackney, [recv_timeout: 30_000]}
+
+ client = Tesla.client([], adapter)
+
+ assert adapter == Tesla.Client.adapter(client)
+ end
+
+ test "converts function adapter properly" do
+ adapter = fn env ->
+ {:ok, %{env | body: "new"}}
+ end
+
+ client = Tesla.client([], adapter)
+
+ assert adapter == Tesla.Client.adapter(client)
+ end
+ end
+
+ describe "Tesla.Client.middleware/1" do
+ test "converts middleware properly" do
+ middlewares = [
+ FirstMiddleware,
+ {SecondMiddleware, options: :are, fun: 1},
+ fn env, _next -> env end
+ ]
+
+ client = Tesla.client(middlewares)
+
+ assert middlewares == Tesla.Client.middleware(client)
+ end
+ end
end

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