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/*
* Copyright (c) 2023. Nydus Developers. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*/
package fanotify
import (
"bufio"
"encoding/csv"
"fmt"
"io"
"log/syslog"
"os"
"os/exec"
"syscall"
"time"
"github.com/containerd/nydus-snapshotter/pkg/fanotify/conn"
"github.com/containerd/nydus-snapshotter/pkg/utils/display"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
type Server struct {
BinaryPath string
ContainerPid uint32
ImageName string
PersistFile string
Readable bool
Overwrite bool
Timeout time.Duration
Client *conn.Client
Cmd *exec.Cmd
LogWriter *syslog.Writer
}
func NewServer(binaryPath string, containerPid uint32, imageName string, persistFile string, readable bool, overwrite bool, timeout time.Duration, logWriter *syslog.Writer) *Server {
return &Server{
BinaryPath: binaryPath,
ContainerPid: containerPid,
ImageName: imageName,
PersistFile: persistFile,
Readable: readable,
Overwrite: overwrite,
Timeout: timeout,
LogWriter: logWriter,
}
}
func (fserver *Server) RunServer() error {
if !fserver.Overwrite {
if file, err := os.Stat(fserver.PersistFile); err == nil && !file.IsDir() {
return nil
}
}
cmd := exec.Command(fserver.BinaryPath)
cmd.SysProcAttr = &syscall.SysProcAttr{
Cloneflags: syscall.CLONE_NEWNS,
Setpgid: true,
}
cmd.Env = append(cmd.Env, "_MNTNS_PID="+fmt.Sprint(fserver.ContainerPid))
cmd.Env = append(cmd.Env, "_TARGET=/")
cmd.Stderr = fserver.LogWriter
notifyR, err := cmd.StdoutPipe()
if err != nil {
return err
}
fserver.Client = &conn.Client{
Reader: bufio.NewReader(notifyR),
}
if err := cmd.Start(); err != nil {
return err
}
fserver.Cmd = cmd
go func() {
if err := fserver.RunReceiver(); err != nil {
logrus.WithError(err).Errorf("Failed to receive event information from server")
}
}()
if fserver.Timeout > 0 {
go func() {
time.Sleep(fserver.Timeout)
fserver.StopServer()
}()
}
return nil
}
func (fserver *Server) RunReceiver() error {
f, err := os.OpenFile(fserver.PersistFile, os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
return errors.Wrapf(err, "failed to open file %q", fserver.PersistFile)
}
defer f.Close()
persistCsvFile := fmt.Sprintf("%s.csv", fserver.PersistFile)
fCsv, err := os.Create(persistCsvFile)
if err != nil {
return errors.Wrapf(err, "failed to create file %q", persistCsvFile)
}
defer fCsv.Close()
csvWriter := csv.NewWriter(fCsv)
if err := csvWriter.Write([]string{"path", "size", "elapsed"}); err != nil {
return errors.Wrapf(err, "failed to write csv header")
}
csvWriter.Flush()
for {
eventInfo, err := fserver.Client.GetEventInfo()
if err != nil {
if err == io.EOF {
logrus.Infoln("Get EOF from fanotify server, break event receiver")
break
}
return fmt.Errorf("failed to get event information: %v", err)
}
if eventInfo != nil {
fmt.Fprintln(f, eventInfo.Path)
var line []string
if fserver.Readable {
line = []string{eventInfo.Path, display.ByteToReadableIEC(eventInfo.Size), display.MicroSecondToReadable(eventInfo.Elapsed)}
} else {
line = []string{eventInfo.Path, fmt.Sprint(eventInfo.Size), fmt.Sprint(eventInfo.Elapsed)}
}
if err := csvWriter.Write(line); err != nil {
return errors.Wrapf(err, "failed to write csv")
}
csvWriter.Flush()
}
}
return nil
}
func (fserver *Server) StopServer() {
if fserver.Cmd != nil {
logrus.Infof("Send SIGTERM signal to process group %d", fserver.Cmd.Process.Pid)
if err := syscall.Kill(-fserver.Cmd.Process.Pid, syscall.SIGTERM); err != nil {
logrus.WithError(err).Errorf("Stop process group %d failed!", fserver.Cmd.Process.Pid)
}
if _, err := fserver.Cmd.Process.Wait(); err != nil {
logrus.WithError(err).Errorf("Failed to wait for fanotify server")
}
}
}
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