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package engine
import (
"context"
"log"
"time"
"vpnem/internal/config"
"vpnem/internal/models"
)
// WatchdogConfig holds watchdog parameters.
type WatchdogConfig struct {
CheckInterval time.Duration // how often to check sing-box is alive (default 2s)
DeepCheckInterval time.Duration // how often to verify exit IP (default 30s)
ReconnectCooldown time.Duration // min time between reconnect attempts (default 5s)
}
// DefaultWatchdogConfig returns the default watchdog settings (from vpn.py).
func DefaultWatchdogConfig() WatchdogConfig {
return WatchdogConfig{
CheckInterval: 2 * time.Second,
DeepCheckInterval: 30 * time.Second,
ReconnectCooldown: 5 * time.Second,
}
}
// Watchdog monitors sing-box and auto-reconnects on failure.
type Watchdog struct {
engine *Engine
cfg WatchdogConfig
cancel context.CancelFunc
running bool
// Reconnect parameters (set via StartWatching)
server models.Server
mode config.Mode
ruleSets []models.RuleSet
serverIPs []string
customBypass []string
localProxyPort int
policy *models.RoutingPolicy
}
// NewWatchdog creates a new watchdog for the given engine.
func NewWatchdog(engine *Engine, cfg WatchdogConfig) *Watchdog {
return &Watchdog{
engine: engine,
cfg: cfg,
}
}
// StartWatching begins monitoring. It stores the connection params for reconnection.
func (w *Watchdog) StartWatching(server models.Server, mode config.Mode, ruleSets []models.RuleSet, serverIPs []string, customBypass []string, localProxyPort int, policy *models.RoutingPolicy) {
w.StopWatching()
w.server = server
w.mode = mode
w.ruleSets = ruleSets
w.serverIPs = serverIPs
w.customBypass = append([]string{}, customBypass...)
w.localProxyPort = localProxyPort
w.policy = policy
ctx, cancel := context.WithCancel(context.Background())
w.cancel = cancel
w.running = true
go w.loop(ctx)
}
// StopWatching stops the watchdog.
func (w *Watchdog) StopWatching() {
if w.cancel != nil {
w.cancel()
}
w.running = false
}
// IsWatching returns whether the watchdog is active.
func (w *Watchdog) IsWatching() bool {
return w.running
}
func (w *Watchdog) loop(ctx context.Context) {
ticker := time.NewTicker(w.cfg.CheckInterval)
defer ticker.Stop()
deepTicker := time.NewTicker(w.cfg.DeepCheckInterval)
defer deepTicker.Stop()
lastReconnect := time.Time{}
for {
select {
case <-ctx.Done():
return
case <-ticker.C:
if !w.engine.IsRunning() {
if time.Since(lastReconnect) < w.cfg.ReconnectCooldown {
continue
}
localProxyPort, err := ResolveLocalProxyPort()
if err != nil {
log.Printf("watchdog: local proxy port selection failed: %v", err)
continue
}
w.localProxyPort = localProxyPort
log.Println("watchdog: sing-box not running, reconnecting...")
if err := w.engine.StartFull(w.server, w.mode, w.ruleSets, w.serverIPs, w.customBypass, w.localProxyPort, w.policy); err != nil {
log.Printf("watchdog: reconnect failed: %v", err)
} else {
log.Println("watchdog: reconnected successfully")
}
lastReconnect = time.Now()
}
case <-deepTicker.C:
if !w.engine.IsRunning() {
continue
}
exitIP := CheckExitIP(w.localProxyPort)
_, probeErr := ProbeBlockedSite(w.localProxyPort, DefaultBlockedSiteProbeURL, 8*time.Second)
if DeepCheckRequiresRestart(w.mode, exitIP, probeErr) {
if ModeRequiresExitIP(w.mode) {
log.Println("watchdog: deep check failed (no exit IP), restarting...")
} else {
log.Printf("watchdog: deep check failed for direct-final mode (%v), restarting...", probeErr)
}
if time.Since(lastReconnect) < w.cfg.ReconnectCooldown {
continue
}
localProxyPort, err := ResolveLocalProxyPort()
if err != nil {
log.Printf("watchdog: local proxy port selection failed: %v", err)
continue
}
w.localProxyPort = localProxyPort
if err := w.engine.RestartFull(w.server, w.mode, w.ruleSets, w.serverIPs, w.customBypass, w.localProxyPort, w.policy); err != nil {
log.Printf("watchdog: restart failed: %v", err)
}
lastReconnect = time.Now()
}
}
}
}
|
