in_udp/in_tcp: Fix source_hostname_key

lib/fluent/plugin/in_tcp.rb

@@ -55,7 +55,7 @@ def multi_workers_ready?
     def start
       super
 
-      server_create(:in_tcp_server, @port, bind: @bind) do |data, conn|
+      server_create(:in_tcp_server, @port, bind: @bind, resolve_name: !!@source_hostname_key) do |data, conn|
         conn.buffer << data
         begin
           pos = 0

lib/fluent/plugin/in_udp.rb

@@ -63,7 +63,7 @@ def start
       super
 
       log.info "listening udp socket", bind: @bind, port: @port
-      server_create(:in_udp_server, @port, proto: :udp, bind: @bind, max_bytes: @message_length_limit, receive_buffer_size: @receive_buffer_size) do |data, sock|
+      server_create(:in_udp_server, @port, proto: :udp, bind: @bind, resolve_name: !!@source_hostname_key, max_bytes: @message_length_limit, receive_buffer_size: @receive_buffer_size) do |data, sock|
         data.chomp! if @remove_newline
         begin
           @parser.parse(data) do |time, record|

test/plugin/test_in_tcp.rb

@@ -115,4 +115,25 @@ def create_tcp_socket(host, port, &block)
       assert_equal expected_record, d.events[i][2]
     end
   end
+
+  test 'source_hostname_key' do
+    d = create_driver(BASE_CONFIG + %!
+      format none
+      source_hostname_key host
+    !)
+    hostname = nil
+    d.run(expect_records: 1) do
+      create_tcp_socket('127.0.0.1', PORT) do |sock|
+        sock.do_not_reverse_lookup = false
+        hostname = sock.peeraddr[2]
+        sock.send("test\n", 0)
+      end
+    end
+
+    assert_equal 1, d.events.size
+    event = d.events[0]
+    assert_equal "tcp", event[0]
+    assert event[1].is_a?(Fluent::EventTime)
+    assert_equal hostname, event[2]['host']
+  end
 end

test/plugin/test_in_udp.rb

@@ -31,6 +31,7 @@ def create_udp_socket(host, port)
         else
           UDPSocket.new(Socket::AF_INET6)
         end
+    u.do_not_reverse_lookup = false
     u.connect(host, port)
     if block_given?
       begin
@@ -174,6 +175,26 @@ def create_udp_socket(host, port)
     end
   end
 
+  test 'source_hostname_key' do
+    d = create_driver(BASE_CONFIG + %!
+      format none
+      source_hostname_key host
+    !)
+    hostname = nil
+    d.run(expect_records: 1) do
+      create_udp_socket('127.0.0.1', PORT) do |u|
+        u.send("test", 0)
+        hostname = u.peeraddr[2]
+      end
+    end
+
+    expected = {'message' => 'test'}
+    assert_equal 1, d.events.size
+    assert_equal "udp", d.events[0][0]
+    assert d.events[0][1].is_a?(Fluent::EventTime)
+    assert_equal hostname, d.events[0][2]['host']
+  end
+
   test 'receive_buffer_size' do
     # doesn't check exact value because it depends on platform and condition