handle EOF on single line content

Andrea Spacca · Andrea Spacca · commit 26eb38f64236 · 2022-11-02T18:52:12.000+09:00
diff --git a/x-pack/filebeat/input/awss3/s3_objects.go b/x-pack/filebeat/input/awss3/s3_objects.go
@@ -300,18 +300,21 @@ func (p *s3ObjectProcessor) readFile(r io.Reader) error {
 	var offset int64
 	for {
 		message, err := reader.Next()
-		if errors.Is(err, io.EOF) {
-			// No more lines
-			break
-		}
-		if err != nil {
+		isEOF := errors.Is(err, io.EOF)
+		if err != nil && !isEOF {
 			return fmt.Errorf("error reading message: %w", err)
 		}
 
 		event := p.createEvent(string(message.Content), offset)
 		event.Fields.DeepUpdate(message.Fields)
 		offset += int64(message.Bytes)
 		p.publish(p.acker, &event)
+
+		if isEOF {
+			// No more lines
+			break
+		}
+
 	}
 
 	return nil
diff --git a/x-pack/filebeat/input/awss3/s3_objects_test.go b/x-pack/filebeat/input/awss3/s3_objects_test.go
@@ -198,6 +198,10 @@ func TestS3ObjectProcessor(t *testing.T) {
 		err := s3ObjProc.Create(ctx, logp.NewLogger(inputName), ack, s3Event).ProcessS3Object()
 		require.NoError(t, err)
 	})
+
+	t.Run("text file without end of line marker", func(t *testing.T) {
+		testProcessS3Object(t, "testdata/no-eol.txt", "text/plain", 1)
+	})
 }
 
 func testProcessS3Object(t testing.TB, file, contentType string, numEvents int, selectors ...fileSelectorConfig) []beat.Event {
diff --git a/x-pack/filebeat/input/awss3/testdata/no-eol.txt b/x-pack/filebeat/input/awss3/testdata/no-eol.txt
@@ -0,0 +1 @@
+This file does contain a final EOL.
