Expose dsn_env function

Author: rafaeljesus

lib/sentry/client.ex

@@ -21,7 +21,7 @@ defmodule Sentry.Client do
   """
   @spec send_event(%Event{}) :: {:ok, String.t} | :error
   def send_event(%Event{} = event) do
-    {endpoint, public_key, secret_key} = parse_dsn!(Application.fetch_env!(:sentry, :dsn))
+    {endpoint, public_key, secret_key} = dsn_env |> parse_dsn!
 
     auth_headers = authorization_headers(public_key, secret_key)
     body = Poison.encode!(event)
@@ -31,6 +31,13 @@ defmodule Sentry.Client do
     end)
   end
 
+  def dsn_env do
+    case Application.get_env(:sentry, :dsn) do
+      {:system, env_var} -> System.get_env(env_var)
+      value -> value
+    end
+  end
+
   defp try_request(method, url, headers, body) do
     do_try_request(method, url, headers, body, 1)
   end