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rotatedumper.go
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/
rotatedumper.go
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/// パケットをpcapにダンプする
package dump
import (
"time"
"github.com/google/gopacket"
"github.com/google/gopacket/layers"
"golang.org/x/xerrors"
)
/// RotateDumperはパケットをダンプするが、一定時間ごとにファイルをローテートする
/// ファイル名にはstrftimeと同じ指定子が使える
type rotateDumper struct {
CreatedAt time.Time
RotateDuration time.Duration
Format string
dumper *dumper
}
func NewRotateDumper(filename string, snaplen uint32, linktype layers.LinkType, dur time.Duration) (Dumper, error) {
d, err := NewDumper(filename, snaplen, linktype)
if err != nil {
return nil, xerrors.Errorf(": %w", err)
}
return &rotateDumper{
dumper: d.(*dumper),
CreatedAt: time.Now(),
Format: filename,
RotateDuration: dur,
}, nil
}
func (d *rotateDumper) Write(ci gopacket.CaptureInfo, data []byte) error {
// rotateするかも
now := time.Now()
if now.Sub(d.CreatedAt) > d.RotateDuration {
d.Close()
newDumper, err := NewDumper(d.Format, d.dumper.SnapLen, d.dumper.LinkType)
newDumper.SetCloseCallback(d.dumper.CloseCallback)
if err != nil {
return xerrors.Errorf(": %w", err)
}
d.dumper = newDumper.(*dumper)
}
// 書き込む
if err := d.dumper.Write(ci, data); err != nil {
return xerrors.Errorf(": %w", err)
}
return nil
}
func (d *rotateDumper) Flush() error {
if err := d.dumper.Flush(); err != nil {
return xerrors.Errorf(": %w", err)
}
return nil
}
func (d *rotateDumper) Close() error {
if err := d.dumper.Close(); err != nil {
return xerrors.Errorf(": %w", err)
}
return nil
}
func (d *rotateDumper) SetCloseCallback(f func(string)) {
d.SetCloseCallback(f)
}