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dnstap_fstrm_input.go
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dnstap_fstrm_input.go
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/*
* Copyright (c) 2018 Manabu Sonoda
*
* 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 dtap
import (
"context"
"fmt"
"io"
dnstap "github.com/dnstap/golang-dnstap"
framestream "github.com/farsightsec/golang-framestream"
)
type DnstapFstrmInput struct {
decoder *framestream.Decoder
rc io.ReadCloser
readError chan error
finished bool
}
func NewDnstapFstrmInput(rc io.ReadCloser, bi bool) (*DnstapFstrmInput, error) {
decoder, err := framestream.NewDecoder(rc, &framestream.DecoderOptions{
ContentType: dnstap.FSContentType,
Bidirectional: bi,
})
if err != nil {
return nil, fmt.Errorf("failed to create framestream Decoder: %w", err)
}
return &DnstapFstrmInput{
rc: rc,
decoder: decoder,
readError: make(chan error),
}, nil
}
func (i *DnstapFstrmInput) read(rbuf *RBuf) {
for {
buf, err := i.decoder.Decode()
if err != nil {
if err == io.EOF {
i.readError <- nil
return
}
i.readError <- fmt.Errorf("decode error: %w", err)
return
}
newbuf := make([]byte, len(buf))
copy(newbuf, buf)
rbuf.Write(newbuf)
}
}
func (i *DnstapFstrmInput) Read(ctx context.Context, rbuf *RBuf) error {
var err error
go i.read(rbuf)
L:
for {
select {
case <-ctx.Done():
i.rc.Close()
case err = <-i.readError:
break L
}
}
return err
}