feat: add vendor

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

@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2014,2019 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"
+	"os"
+)
+
+// FrameStreamOutput implements a dnstap Output to an io.Writer.
+type FrameStreamOutput struct {
+	outputChannel chan []byte
+	wait          chan bool
+	w             Writer
+	log           Logger
+}
+
+// NewFrameStreamOutput creates a FrameStreamOutput writing dnstap data to
+// the given io.Writer.
+func NewFrameStreamOutput(w io.Writer) (o *FrameStreamOutput, err error) {
+	ow, err := NewWriter(w, nil)
+	if err != nil {
+		return nil, err
+	}
+	return &FrameStreamOutput{
+		outputChannel: make(chan []byte, outputChannelSize),
+		wait:          make(chan bool),
+		w:             ow,
+		log:           nullLogger{},
+	}, nil
+}
+
+// NewFrameStreamOutputFromFilename creates a file with the name fname,
+// truncates it if it exists, and returns a FrameStreamOutput writing to
+// the newly created or truncated file.
+func NewFrameStreamOutputFromFilename(fname string) (o *FrameStreamOutput, err error) {
+	if fname == "" || fname == "-" {
+		return NewFrameStreamOutput(os.Stdout)
+	}
+	w, err := os.Create(fname)
+	if err != nil {
+		return
+	}
+	return NewFrameStreamOutput(w)
+}
+
+// SetLogger sets an alternate logger for the FrameStreamOutput. The default
+// is no logging.
+func (o *FrameStreamOutput) SetLogger(logger Logger) {
+	o.log = logger
+}
+
+// GetOutputChannel returns the channel on which the FrameStreamOutput accepts
+// data.
+//
+// GetOutputData satisfies the dnstap Output interface.
+func (o *FrameStreamOutput) GetOutputChannel() chan []byte {
+	return o.outputChannel
+}
+
+// RunOutputLoop processes data received on the channel returned by
+// GetOutputChannel, returning after the CLose method is called.
+// If there is an error writing to the Output's writer, RunOutputLoop()
+// returns, logging an error if a logger is configured with SetLogger()
+//
+// RunOutputLoop satisfies the dnstap Output interface.
+func (o *FrameStreamOutput) RunOutputLoop() {
+	for frame := range o.outputChannel {
+		if _, err := o.w.WriteFrame(frame); err != nil {
+			o.log.Printf("FrameStreamOutput: Write error: %v, returning", err)
+			close(o.wait)
+			return
+		}
+	}
+	close(o.wait)
+}
+
+// Close closes the channel returned from GetOutputChannel, and flushes
+// all pending output.
+//
+// Close satisifies the dnstap Output interface.
+func (o *FrameStreamOutput) Close() {
+	close(o.outputChannel)
+	<-o.wait
+	o.w.Close()
+}