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/*
* Copyright (c) 2014 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"
"log"
"os"
"github.com/farsightsec/golang-framestream"
)
type FrameStreamOutput struct {
outputChannel chan []byte
wait chan bool
enc *framestream.Encoder
}
func NewFrameStreamOutput(w io.Writer) (o *FrameStreamOutput, err error) {
o = new(FrameStreamOutput)
o.outputChannel = make(chan []byte, outputChannelSize)
o.enc, err = framestream.NewEncoder(w, &framestream.EncoderOptions{ContentType: FSContentType})
if err != nil {
return
}
o.wait = make(chan bool)
return
}
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)
}
func (o *FrameStreamOutput) GetOutputChannel() chan []byte {
return o.outputChannel
}
func (o *FrameStreamOutput) RunOutputLoop() {
for frame := range o.outputChannel {
if _, err := o.enc.Write(frame); err != nil {
log.Fatalf("framestream.Encoder.Write() failed: %s\n", err)
break
}
}
close(o.wait)
}
func (o *FrameStreamOutput) Close() {
close(o.outputChannel)
<-o.wait
o.enc.Flush()
o.enc.Close()
}
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