in_tcp: Improve the performance for multiple events case

lib/fluent/plugin/in_tcp.rb

@@ -61,13 +61,15 @@ def multi_workers_ready?
     def start
       super
 
-      server_create(:in_tcp_server, @port, bind: @bind, resolve_name: !!@source_hostname_key) do |data, conn|
-        conn.buffer << data
-        begin
+      del_size = @delimiter.length
+      if @_extract_enabled && @_extract_tag_key
+        server_create(:in_tcp_server_single_emit, @port, bind: @bind, resolve_name: !!@source_hostname_key) do |data, conn|
+          conn.buffer << data
+          buf = conn.buffer
           pos = 0
-          while i = conn.buffer.index(@delimiter, pos)
-            msg = conn.buffer[pos...i]
-            pos = i + @delimiter.length
+          while i = buf.index(@delimiter, pos)
+            msg = buf[pos...i]
+            pos = i + del_size
 
             @parser.parse(msg) do |time, record|
               unless time && record
@@ -83,7 +85,32 @@ def start
               router.emit(tag, time, record)
             end
           end
-          conn.buffer.slice!(0, pos) if pos > 0
+          buf.slice!(0, pos) if pos > 0
+        end
+      else
+        server_create(:in_tcp_server_batch_emit, @port, bind: @bind, resolve_name: !!@source_hostname_key) do |data, conn|
+          conn.buffer << data
+          buf = conn.buffer
+          pos = 0
+          es = Fluent::MultiEventStream.new
+          while i = buf.index(@delimiter, pos)
+            msg = buf[pos...i]
+            pos = i + del_size
+
+            @parser.parse(msg) do |time, record|
+              unless time && record
+                log.warn "pattern not matched", message: msg
+                next
+              end
+
+              time ||= extract_time_from_record(record) || Fluent::EventTime.now
+              record[@source_address_key] = conn.remote_addr if @source_address_key
+              record[@source_hostname_key] = conn.remote_host if @source_hostname_key
+              es.add(time, record)
+            end
+          end
+          router.emit_stream(@tag, es)
+          buf.slice!(0, pos) if pos > 0
         end
       end
     end

test/plugin/test_in_tcp.rb

@@ -162,4 +162,29 @@ def create_tcp_socket(host, port, &block)
     assert event[1].is_a?(Fluent::EventTime)
     assert_equal address, event[2]['addr']
   end
+
+  sub_test_case '<extract>' do
+    test 'extract tag from record field' do
+      d = create_driver(BASE_CONFIG + %!
+        <parse>
+          @type json
+        </parse>
+        <extract>
+          tag_key tag
+        </extract>
+      !)
+      d.run(expect_records: 1) do
+        create_tcp_socket('127.0.0.1', PORT) do |sock|
+          data = {'msg' => 'hello', 'tag' => 'helper_test'}
+          sock.send("#{data.to_json}\n", 0)
+        end
+      end
+
+      assert_equal 1, d.events.size
+      event = d.events[0]
+      assert_equal 'helper_test', event[0]
+      assert event[1].is_a?(Fluent::EventTime)
+      assert_equal 'hello', event[2]['msg']
+    end
+  end
 end