From 2c37516f1b2c236ae934da9fa4444aaf1d12c36e Mon Sep 17 00:00:00 2001
From: Marcin Rataj <lidel@lidel.org>
Date: Thu, 4 Feb 2016 22:51:47 +0100
Subject: [PATCH] Do not cache dnslink lookup when API is offline

---
 lib/api.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/lib/api.js b/lib/api.js
index 3dad5d183..a51bb2f6f 100644
--- a/lib/api.js
+++ b/lib/api.js
@@ -57,7 +57,7 @@ function isDnslinkPresent (fqdn) {
   try {
     xhr.send(null)
   } catch (e) {
-    return false
+    return null
   }
   if (xhr.status === 200) {
     let json = JSON.parse(xhr.responseText)
@@ -71,9 +71,11 @@ function isDnslinkPresentCached (fqdn) {
   let ipfsSupport = dnsCache.get(fqdn)
   if (typeof ipfsSupport === 'undefined') {
     ipfsSupport = isDnslinkPresent(fqdn)
-    dnsCache.put(fqdn, ipfsSupport)
+    if (ipfsSupport !== null) { // dont cache is API was down
+      dnsCache.put(fqdn, ipfsSupport)
+    }
   }
-  return ipfsSupport
+  return !!ipfsSupport
 }
 
 exports.apiUrl = apiUrl