Close discarded connections

lib/net/http/persistent/timed_stack_multi.rb

@@ -63,7 +63,8 @@ def try_create options = {} # :nodoc:
     if @created >= @max && @enqueued >= 1
       oldest, = @lru.first
       @lru.delete oldest
-      @ques[oldest].pop
+      connection = @ques[oldest].pop
+      connection.close if connection.respond_to?(:close)
 
       @created -= 1
     end

test/test_net_http_persistent_timed_stack_multi.rb

@@ -4,10 +4,15 @@
 class TestNetHttpPersistentTimedStackMulti < Minitest::Test
 
   class Connection
-    attr_reader :host
+    attr_reader :host, :closed
 
     def initialize(host)
       @host = host
+      @closed = false
+    end
+
+    def close
+      @closed = true
     end
   end
 
@@ -69,6 +74,18 @@ def test_pop_full
     assert_empty stack
   end
 
+  def test_pop_closes_extra_connections
+    stack = Net::HTTP::Persistent::TimedStackMulti.new(1) { |host| Connection.new(host) }
+
+    a_conn = stack.pop connection_args: 'a.example'
+    stack.push a_conn, connection_args: 'a.example'
+
+    b_conn = stack.pop connection_args: 'b.example'
+
+    assert a_conn.closed
+    refute b_conn.closed
+  end
+
   def test_pop_wait
     thread = Thread.start do
       @stack.pop