Enable frozen string for lib/gitlab/*.rb

1 files changed, 9 insertions, 6 deletions

diff --git a/lib/gitlab/http_io.rb b/lib/gitlab/http_io.rb
index ce24817db54..9d7763fc5ac 100644
--- a/lib/gitlab/http_io.rb
+++ b/lib/gitlab/http_io.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 ##
 # This class is compatible with IO class (https://ruby-doc.org/core-2.3.1/IO.html)
 # source: https://gitlab.com/snippets/1685610
@@ -73,8 +75,8 @@ module Gitlab
       end
     end
 
-    def read(length = nil, outbuf = "")
-      out = ""
+    def read(length = nil, outbuf = nil)
+      out = []
 
       length ||= size - tell
 
@@ -90,17 +92,18 @@ module Gitlab
         length -= chunk_data.bytesize
       end
 
+      out = out.join
+
       # If outbuf is passed, we put the output into the buffer. This supports IO.copy_stream functionality
       if outbuf
-        outbuf.slice!(0, outbuf.bytesize)
-        outbuf << out
+        outbuf.replace(out)
       end
 
       out
     end
 
     def readline
-      out = ""
+      out = []
 
       until eof?
         data = get_chunk
@@ -116,7 +119,7 @@ module Gitlab
         end
       end
 
-      out
+      out.join
     end
 
     def write(data)