From 98b236f737d4db31d663e4a5df51d33f0be67920 Mon Sep 17 00:00:00 2001
From: Julian Simioni <julian@simioni.org>
Date: Sun, 11 Mar 2018 21:26:33 -0400
Subject: [PATCH] Only call language service when language not defaulted

The default language is English, which is also what is stored in
Elasticsearch. Thus, if the user did not specify a language via headers
or query parameter, there is no reason to call Placeholder.

Some Placeholder responses for language translation can be 30KB, and all
that JSON takes considerable time to parse
---
 routes/v1.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/routes/v1.js b/routes/v1.js
index 6b40f1d6f..7333b1876 100644
--- a/routes/v1.js
+++ b/routes/v1.js
@@ -226,6 +226,10 @@ function addRoutes(app, peliasConfig) {
     isAddressItParse
   );
 
+  const languageWasSpecified = function(req, res) {
+    return !req.clean.lang.defaulted;
+  };
+
   // get language adjustments if:
   // - there's a response
   // - theres's a lang parameter in req.clean
@@ -233,6 +237,7 @@ function addRoutes(app, peliasConfig) {
     hasResponseData,
     not(hasRequestErrors),
     isChangeLanguageEnabled,
+    languageWasSpecified,
     hasRequestParameter('lang')
   );