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daf8ef0da8
* adds the dnstap I/O thread and should fix a lot of mistakes * docs * -race test * oops * docs
60 lines
1.2 KiB
Go
60 lines
1.2 KiB
Go
package out
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import (
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"net"
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"time"
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fs "github.com/farsightsec/golang-framestream"
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)
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// TCP is a Frame Streams encoder over TCP.
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type TCP struct {
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address string
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frames [][]byte
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}
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// NewTCP returns a TCP writer.
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func NewTCP(address string) *TCP {
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s := &TCP{address: address}
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s.frames = make([][]byte, 0, 13) // 13 messages buffer
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return s
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}
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// Write a single Frame Streams frame.
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func (s *TCP) Write(frame []byte) (n int, err error) {
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s.frames = append(s.frames, frame)
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if len(s.frames) == cap(s.frames) {
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return len(frame), s.Flush()
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}
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return len(frame), nil
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}
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// Flush the remaining frames.
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func (s *TCP) Flush() error {
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defer func() {
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s.frames = s.frames[:0]
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}()
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c, err := net.DialTimeout("tcp", s.address, time.Second)
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if err != nil {
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return err
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}
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enc, err := fs.NewEncoder(c, &fs.EncoderOptions{
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ContentType: []byte("protobuf:dnstap.Dnstap"),
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Bidirectional: true,
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})
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if err != nil {
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return err
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}
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for _, frame := range s.frames {
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if _, err = enc.Write(frame); err != nil {
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return err
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}
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}
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return enc.Flush()
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}
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// Close is an alias to Flush to satisfy io.WriteCloser similarly to type Socket.
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func (s *TCP) Close() error {
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return s.Flush()
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}
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