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syncthing.go
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syncthing.go
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package syncthing
import (
"bytes"
"fmt"
"io/ioutil"
"net"
"os"
"os/exec"
"path"
"path/filepath"
"runtime"
"strconv"
"strings"
"text/template"
log "github.com/sirupsen/logrus"
)
var (
configTemplate = template.Must(template.New("syncthingConfig").Parse(configXML))
)
const (
certFile = "cert.pem"
keyFile = "key.pem"
configFile = "config.xml"
portFile = ".port"
logFile = "syncthing.log"
// DefaultRemoteDeviceID remote syncthing ID
DefaultRemoteDeviceID = "ATOPHFJ-VPVLDFY-QVZDCF2-OQQ7IOW-OG4DIXF-OA7RWU3-ZYA4S22-SI4XVAU"
// DefaultFileWatcherDelay how much to wait before starting a sync after a file change
DefaultFileWatcherDelay = 5
)
// Syncthing represents the local syncthing process.
type Syncthing struct {
cmd *exec.Cmd
binPath string
Home string
Name string
Namespace string
LocalPath string
RemoteAddress string
RemoteDeviceID string
APIKey string
FileWatcherDelay int
GUIAddress string
ListenAddress string
}
// NewSyncthing constructs a new Syncthing.
func NewSyncthing(name, namespace, localPath string) (*Syncthing, error) {
remotePort, err := getAvailablePort()
if err != nil {
return nil, err
}
guiPort, err := getAvailablePort()
if err != nil {
return nil, err
}
listenPort, err := getAvailablePort()
if err != nil {
return nil, err
}
s := &Syncthing{
APIKey: "cnd",
binPath: "syncthing",
Name: name,
Namespace: namespace,
Home: path.Join(os.Getenv("HOME"), ".cnd", namespace, name),
LocalPath: localPath,
RemoteAddress: fmt.Sprintf("tcp://localhost:%d", remotePort),
RemoteDeviceID: DefaultRemoteDeviceID,
FileWatcherDelay: DefaultFileWatcherDelay,
GUIAddress: fmt.Sprintf("127.0.0.1:%d", guiPort),
ListenAddress: fmt.Sprintf("0.0.0.0:%d", listenPort),
}
if err := s.initConfig(); err != nil {
return nil, err
}
return s, nil
}
// Normally, syscall.Kill would be good enough. Unfortunately, that's not
// supported in windows. While this isn't tested on windows it at least gets
// past the compiler.
func (s *Syncthing) cleanupDaemon(pidPath string) error {
// Deal with Windows conditions by bailing
if runtime.GOOS == "windows" {
return nil
}
if _, err := os.Stat(pidPath); err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
content, err := ioutil.ReadFile(pidPath) // nolint: gosec
if err != nil {
return err
}
pid, pidErr := strconv.Atoi(string(content))
if pidErr != nil {
return pidErr
}
proc := os.Process{Pid: pid}
if err := proc.Signal(os.Interrupt); err != nil {
if strings.Contains(err.Error(), "process already finished") {
return nil
}
return err
}
defer proc.Wait() // nolint: errcheck
return nil
}
func (s *Syncthing) initConfig() error {
os.MkdirAll(s.Home, 0700)
buf := new(bytes.Buffer)
if err := configTemplate.Execute(buf, s); err != nil {
return err
}
if err := ioutil.WriteFile(path.Join(s.Home, configFile), buf.Bytes(), 0700); err != nil {
return err
}
if err := ioutil.WriteFile(path.Join(s.Home, certFile), cert, 0700); err != nil {
return err
}
if err := ioutil.WriteFile(path.Join(s.Home, keyFile), key, 0700); err != nil {
return err
}
return nil
}
func getAvailablePort() (int, error) {
address, err := net.ResolveTCPAddr("tcp", "localhost:0")
if err != nil {
return 0, err
}
listener, err := net.ListenTCP("tcp", address)
if err != nil {
return 0, err
}
defer listener.Close()
return listener.Addr().(*net.TCPAddr).Port, nil
}
// Run starts up a local syncthing process to serve files from.
func (s *Syncthing) Run() error {
pidPath := filepath.Join(s.Home, "syncthing.pid")
if err := s.cleanupDaemon(pidPath); err != nil {
return err
}
cmdArgs := []string{
"-home", s.Home,
"-no-browser",
"-verbose",
"-logfile", path.Join(s.Home, logFile),
}
s.cmd = exec.Command(s.binPath, cmdArgs...) //nolint: gas, gosec
s.cmd.Env = append(os.Environ(), "STNOUPGRADE=1")
if err := s.cmd.Start(); err != nil {
return err
}
if s.cmd.Process == nil {
return nil
}
if err := ioutil.WriteFile(
pidPath,
[]byte(strconv.Itoa(s.cmd.Process.Pid)),
0600); err != nil {
return err
}
log.Infof("Syncthing running on http://%s and tcp://%s", s.GUIAddress, s.ListenAddress)
return nil
}
// Stop halts the background process and cleans up.
func (s *Syncthing) Stop() error {
pidPath := filepath.Join(s.Home, "syncthing.pid")
if err := s.cleanupDaemon(pidPath); err != nil {
return err
}
return nil
}