feat: add retry_count opt in the retry middleware (#686)

lib/tesla/middleware/retry.ex

@@ -86,13 +86,18 @@ defmodule Tesla.Middleware.Retry do
   defp retry(env, next, %{max_retries: 0}), do: Tesla.run(env, next)
 
   # If we're on our last retry then just run and don't handle the error
-  defp retry(env, next, %{max_retries: max, retries: max}) do
-    Tesla.run(env, next)
+  defp retry(env, next, %{max_retries: max, retries: max} = context) do
+    env
+    |> put_retry_count_opt(context)
+    |> Tesla.run(next)
   end
 
   # Otherwise we retry if we get a retriable error
   defp retry(env, next, context) do
-    res = Tesla.run(env, next)
+    res =
+      env
+      |> put_retry_count_opt(context)
+      |> Tesla.run(next)
 
     {:arity, should_retry_arity} = :erlang.fun_info(context.should_retry, :arity)
 
@@ -129,6 +134,15 @@ defmodule Tesla.Middleware.Retry do
     :timer.sleep(delay)
   end
 
+  defp put_retry_count_opt(env, %{retries: 0} = _context) do
+    env
+  end
+
+  defp put_retry_count_opt(env, context) do
+    opts = Keyword.put(env.opts, :retry_count, context.retries)
+    %{env | opts: opts}
+  end
+
   defp integer_opt!(opts, key, min) do
     case Keyword.fetch(opts, key) do
       {:ok, value} when is_integer(value) and value >= min -> value

mix.exs

@@ -2,7 +2,7 @@ defmodule Tesla.Mixfile do
   use Mix.Project
 
   @source_url "https://github.com/teamon/tesla"
-  @version "1.10.3"
+  @version "1.11.0"
 
   def project do
     [

test/tesla/middleware/retry_test.exs

@@ -75,7 +75,15 @@ defmodule Tesla.Middleware.RetryTest do
   end
 
   test "finally pass on laggy request" do
-    assert {:ok, %Tesla.Env{url: "/maybe", method: :get}} = Client.get("/maybe")
+    assert {:ok, %Tesla.Env{url: "/maybe", method: :get}} = Client.get("/maybe") |> dbg()
+  end
+
+  test "pass retry_count opt" do
+    assert {:ok, env} = Client.get("/maybe")
+    assert env.opts[:retry_count] == 5
+
+    assert {:ok, env} = Client.get("/ok")
+    assert env.opts[:retry_count] == nil
   end
 
   test "raise if max_retries is exceeded" do