feat: add vendor

vendor/github.com/dnstap/golang-dnstap/Writer.go

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2019 by Farsight Security, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package dnstap
+
+import (
+	"io"
+	"time"
+
+	framestream "github.com/farsightsec/golang-framestream"
+)
+
+// A Writer writes dnstap frames to its destination.
+type Writer interface {
+	WriteFrame([]byte) (int, error)
+	Close() error
+}
+
+// WriterOptions specifies configuration for the Writer
+type WriterOptions struct {
+	// If Bidirectional is true, the underlying io.Writer must also
+	// satisfy io.Reader, and the dnstap Writer will use the bidirectional
+	// Frame Streams protocol.
+	Bidirectional bool
+	// Timeout sets the write timeout for data and control messages and the
+	// read timeout for handshake responses on the underlying Writer. Timeout
+	// is only effective if the underlying Writer is a net.Conn.
+	Timeout time.Duration
+}
+
+// NewWriter creates a Writer using the given io.Writer and options.
+func NewWriter(w io.Writer, opt *WriterOptions) (Writer, error) {
+	if opt == nil {
+		opt = &WriterOptions{}
+	}
+	return framestream.NewWriter(w,
+		&framestream.WriterOptions{
+			ContentTypes:  [][]byte{FSContentType},
+			Timeout:       opt.Timeout,
+			Bidirectional: opt.Bidirectional,
+		})
+}