Update the data structure of telemetry and other minor fixes

lib/tesla/middleware/telemetry.ex

@@ -31,7 +31,7 @@ defmodule Tesla.Middleware.Telemetry do
   @doc false
   def call(env, next, _opts) do
     {time, res} = :timer.tc(Tesla, :run, [env, next])
-    :telemetry.execute([:tesla, :telemetry, :traffic], time, Enum.into([res], %{}))
+    :telemetry.execute([:tesla, :request], time, %{result: res})
     res
   end
 end

mix.exs

@@ -68,7 +68,7 @@ defmodule Tesla.Mixfile do
 
       # other
       {:fuse, "~> 2.4", optional: true},
-      {:telemetry, "~> 0.3.0", optional: true},
+      {:telemetry, "~> 0.3", optional: true},
 
       # testing & docs
       {:excoveralls, "~> 0.8", only: :test},

test/tesla/middleware/telemetry_test.exs

@@ -22,24 +22,24 @@ defmodule Tesla.Middleware.TelemetryTest do
   test "Get the info from telemetry" do
     :telemetry.attach(
       "telemetry_test",
-      [:tesla, :telemetry, :traffic],
-      fn ([:tesla, :telemetry, :traffic], response, meta, _config) ->
+      [:tesla, :request],
+      fn ([:tesla, :request], response, meta, _config) ->
         send self(), {:ok_called, is_integer(response), meta}
       end,
       nil)
     Client.get("/telemetry")
-    assert_receive {:ok_called, true, %{ok: %Tesla.Env{url: "/telemetry", method: :get}}}, 1000
+    assert_receive {:ok_called, true, %{result: {:ok, %Tesla.Env{url: "/telemetry", method: :get}}}}, 1000
   end
 
   test "Get the error from telemetry" do
     :telemetry.attach(
       "telemetry_test_error",
-      [:tesla, :telemetry, :traffic],
-      fn([:tesla, :telemetry, :traffic], response, meta, _config) ->
+      [:tesla, :request],
+      fn([:tesla, :request], response, meta, _config) ->
         send self(), {:error_called, is_integer(response), meta}
       end,
       nil)
     Client.get("/telemetry_error")
-    assert_receive {:error_called, true, %{error: :econnrefused}}, 1000
+    assert_receive {:error_called, true, %{result: {:error, :econnrefused}}}, 1000
   end
 end