optionally finish traces

lib/spandex_phoenix/plug/finish_trace.ex

@@ -5,13 +5,17 @@ defmodule SpandexPhoenix.Plug.FinishTrace do
 
   @init_opts Optimal.schema(
                opts: [
-                 tracer: :atom
+                 tracer: :atom,
+                 finish_trace?: :boolean
                ],
                defaults: [
-                 tracer: Application.get_env(:spandex_phoenix, :tracer)
+                 tracer: Application.get_env(:spandex_phoenix, :tracer),
+                 finish_trace?: Application.get_env(:spandex_phoenix, :finish_trace?, true)
                ],
                describe: [
-                 tracer: "The tracing module to be used to start the trace."
+                 tracer: "The tracing module to be used to start the trace.",
+                 finish_trace?:
+                   "If we should finish traces, set to false if you're tracing your tests since your test middleware should finish the test trace."
                ]
              )
 
@@ -24,8 +28,9 @@ defmodule SpandexPhoenix.Plug.FinishTrace do
   @impl Plug
   def call(conn, opts) do
     tracer = opts[:tracer]
+    finish_trace? = opts[:finish_trace?]
 
-    if tracer.current_trace_id() do
+    if tracer.current_trace_id() && finish_trace? do
       tracer.finish_trace()
     end