mirror of
https://github.com/kubenetworks/kubevpn.git
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101 lines
2.9 KiB
Go
101 lines
2.9 KiB
Go
/*
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* Copyright (c) 2014,2019 by Farsight Security, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package dnstap
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import (
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"io"
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"os"
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)
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// FrameStreamOutput implements a dnstap Output to an io.Writer.
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type FrameStreamOutput struct {
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outputChannel chan []byte
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wait chan bool
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w Writer
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log Logger
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}
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// NewFrameStreamOutput creates a FrameStreamOutput writing dnstap data to
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// the given io.Writer.
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func NewFrameStreamOutput(w io.Writer) (o *FrameStreamOutput, err error) {
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ow, err := NewWriter(w, nil)
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if err != nil {
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return nil, err
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}
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return &FrameStreamOutput{
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outputChannel: make(chan []byte, outputChannelSize),
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wait: make(chan bool),
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w: ow,
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log: nullLogger{},
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}, nil
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}
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// NewFrameStreamOutputFromFilename creates a file with the name fname,
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// truncates it if it exists, and returns a FrameStreamOutput writing to
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// the newly created or truncated file.
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func NewFrameStreamOutputFromFilename(fname string) (o *FrameStreamOutput, err error) {
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if fname == "" || fname == "-" {
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return NewFrameStreamOutput(os.Stdout)
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}
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w, err := os.Create(fname)
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if err != nil {
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return
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}
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return NewFrameStreamOutput(w)
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}
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// SetLogger sets an alternate logger for the FrameStreamOutput. The default
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// is no logging.
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func (o *FrameStreamOutput) SetLogger(logger Logger) {
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o.log = logger
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}
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// GetOutputChannel returns the channel on which the FrameStreamOutput accepts
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// data.
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//
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// GetOutputData satisfies the dnstap Output interface.
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func (o *FrameStreamOutput) GetOutputChannel() chan []byte {
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return o.outputChannel
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}
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// RunOutputLoop processes data received on the channel returned by
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// GetOutputChannel, returning after the CLose method is called.
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// If there is an error writing to the Output's writer, RunOutputLoop()
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// returns, logging an error if a logger is configured with SetLogger()
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//
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// RunOutputLoop satisfies the dnstap Output interface.
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func (o *FrameStreamOutput) RunOutputLoop() {
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for frame := range o.outputChannel {
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if _, err := o.w.WriteFrame(frame); err != nil {
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o.log.Printf("FrameStreamOutput: Write error: %v, returning", err)
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close(o.wait)
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return
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}
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}
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close(o.wait)
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}
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// Close closes the channel returned from GetOutputChannel, and flushes
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// all pending output.
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//
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// Close satisifies the dnstap Output interface.
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func (o *FrameStreamOutput) Close() {
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close(o.outputChannel)
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<-o.wait
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o.w.Close()
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}
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