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atomicPcapGoWriter.go
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atomicPcapGoWriter.go
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/*
* NETCAP - Network Capture Framework
* Copyright (c) 2017 Philipp Mieden <dreadl0ck [at] protonmail [dot] ch>
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package collector
import (
"sync"
"github.com/google/gopacket"
"github.com/google/gopacket/pcapgo"
)
//////////////////////////
// Atomic PcapGo Writer //
//////////////////////////
// AtomicPcapGoWriter is a symchronized PCAP writer
// that counts the number of packets written
type AtomicPcapGoWriter struct {
count int64
w pcapgo.Writer
sync.Mutex
}
// WritePacket writes a packet into the writer
func (a *AtomicPcapGoWriter) WritePacket(ci gopacket.CaptureInfo, data []byte) error {
// sync
a.Lock()
a.count++
// write data
err := a.w.WritePacket(ci, data)
// dont use a defer here for performance
a.Unlock()
return err
}
// NewAtomicPcapGoWriter takes a pcapgo.Writer and returns an atomic version
func NewAtomicPcapGoWriter(w *pcapgo.Writer) *AtomicPcapGoWriter {
return &AtomicPcapGoWriter{
w: *w,
}
}