Improve remote rule-set update

adapter/router.go

@@ -46,7 +46,6 @@ type ConnectionRouterEx interface {
 type RuleSet interface {
 	Name() string
 	StartContext(ctx context.Context, startContext *HTTPStartContext) error
-	PostStart() error
 	Metadata() RuleSetMetadata
 	ExtractIPSet() []*netipx.IPSet
 	IncRef()

route/router.go

@@ -40,6 +40,7 @@ type Router struct {
 	leaseFiles        []string
 	ruleSets          []adapter.RuleSet
 	ruleSetMap        map[string]adapter.RuleSet
+	ruleSetUpdater    *R.RuleSetUpdater
 	processSearcher   process.Searcher
 	processCache      freelru.Cache[processCacheKey, processCacheEntry]
 	neighborResolver  adapter.NeighborResolver
@@ -156,6 +157,7 @@ func (r *Router) Start(stage adapter.StartStage) error {
 		if startContext != nil {
 			startContext.Close()
 		}
+		r.ruleSetUpdater = R.NewRuleSetUpdater(r.ctx, r.ruleSets)
 		r.network.Initialize(r.ruleSets)
 		needFindProcess := r.needFindProcess
 		for _, ruleSet := range r.ruleSets {
@@ -201,13 +203,8 @@ func (r *Router) Start(stage adapter.StartStage) error {
 				return E.Cause(err, "initialize rule[", i, "]")
 			}
 		}
-		for _, ruleSet := range r.ruleSets {
+		if r.ruleSetUpdater != nil {
-			monitor.Start("post start rule_set[", ruleSet.Name(), "]")
+			r.ruleSetUpdater.Start()
-			err := ruleSet.PostStart()
-			monitor.Finish()
-			if err != nil {
-				return E.Cause(err, "post start rule_set[", ruleSet.Name(), "]")
-			}
 		}
 		r.started = true
 		return nil
@@ -237,6 +234,13 @@ func (r *Router) Close() error {
 		})
 		monitor.Finish()
 	}
+	if r.ruleSetUpdater != nil {
+		monitor.Start("close rule-set updater")
+		err = E.Append(err, r.ruleSetUpdater.Close(), func(err error) error {
+			return E.Cause(err, "close rule-set updater")
+		})
+		monitor.Finish()
+	}
 	for i, ruleSet := range r.ruleSets {
 		monitor.Start("close rule-set[", i, "]")
 		err = E.Append(err, ruleSet.Close(), func(err error) error {

route/rule/rule_abstract_test.go

@@ -24,10 +24,6 @@ func (f *fakeRuleSet) StartContext(context.Context, *adapter.HTTPStartContext) e
 	return nil
 }
 
-func (f *fakeRuleSet) PostStart() error {
-	return nil
-}
-
 func (f *fakeRuleSet) Metadata() adapter.RuleSetMetadata {
 	return adapter.RuleSetMetadata{}
 }

route/rule/rule_set_local.go

@@ -153,10 +153,6 @@ func (s *LocalRuleSet) reloadRules(headlessRules []option.HeadlessRule) error {
 	return nil
 }
 
-func (s *LocalRuleSet) PostStart() error {
-	return nil
-}
-
 func (s *LocalRuleSet) Metadata() adapter.RuleSetMetadata {
 	s.access.RLock()
 	defer s.access.RUnlock()

route/rule/rule_set_remote.go

@@ -5,7 +5,6 @@ import (
 	"context"
 	"io"
 	"net/http"
-	"runtime"
 	"strings"
 	"sync"
 	"sync/atomic"
@@ -43,7 +42,6 @@ type RemoteRuleSet struct {
 	metadata       adapter.RuleSetMetadata
 	lastUpdated    time.Time
 	lastEtag       string
-	updateTicker   *time.Ticker
 	cacheFile      adapter.CacheFile
 	pauseManager   pause.Manager
 	callbacks      list.List[adapter.RuleSetUpdateCallback]
@@ -102,12 +100,6 @@ func (s *RemoteRuleSet) StartContext(ctx context.Context, startContext *adapter.
 			return E.Cause(err, "initial rule-set: ", s.options.Tag)
 		}
 	}
-	s.updateTicker = time.NewTicker(s.updateInterval)
-	return nil
-}
-
-func (s *RemoteRuleSet) PostStart() error {
-	go s.loopUpdate()
 	return nil
 }
 
@@ -197,21 +189,6 @@ func (s *RemoteRuleSet) loadBytes(content []byte) error {
 	return nil
 }
 
-func (s *RemoteRuleSet) loopUpdate() {
-	if time.Since(s.lastUpdated) > s.updateInterval {
-		s.updateOnce()
-	}
-	for {
-		runtime.GC()
-		select {
-		case <-s.ctx.Done():
-			return
-		case <-s.updateTicker.C:
-			s.updateOnce()
-		}
-	}
-}
-
 func (s *RemoteRuleSet) updateOnce() {
 	err := s.fetch(s.ctx, false)
 	if err != nil {
@@ -312,9 +289,6 @@ func (s *RemoteRuleSet) resolveTransport() (adapter.HTTPTransport, error) {
 func (s *RemoteRuleSet) Close() error {
 	s.rules = nil
 	s.cancel()
-	if s.updateTicker != nil {
-		s.updateTicker.Stop()
-	}
 	return nil
 }
 

route/rule/rule_set_updater.go

@@ -0,0 +1,87 @@
+package rule
+
+import (
+	"context"
+	"runtime"
+	"time"
+
+	"github.com/sagernet/sing-box/adapter"
+)
+
+type RuleSetUpdater struct {
+	ctx      context.Context
+	cancel   context.CancelFunc
+	ruleSets []*RemoteRuleSet
+}
+
+func NewRuleSetUpdater(ctx context.Context, ruleSets []adapter.RuleSet) *RuleSetUpdater {
+	var remoteRuleSets []*RemoteRuleSet
+	for _, ruleSet := range ruleSets {
+		remoteRuleSet, isRemote := ruleSet.(*RemoteRuleSet)
+		if isRemote {
+			remoteRuleSets = append(remoteRuleSets, remoteRuleSet)
+		}
+	}
+	if len(remoteRuleSets) == 0 {
+		return nil
+	}
+	ctx, cancel := context.WithCancel(ctx)
+	return &RuleSetUpdater{
+		ctx:      ctx,
+		cancel:   cancel,
+		ruleSets: remoteRuleSets,
+	}
+}
+
+func (u *RuleSetUpdater) Start() {
+	go u.loopUpdate()
+}
+
+func (u *RuleSetUpdater) Close() error {
+	u.cancel()
+	return nil
+}
+
+func (u *RuleSetUpdater) loopUpdate() {
+	nextUpdates := make([]time.Time, len(u.ruleSets))
+	for i, ruleSet := range u.ruleSets {
+		nextUpdates[i] = ruleSet.lastUpdated.Add(ruleSet.updateInterval)
+	}
+	timer := time.NewTimer(0)
+	defer timer.Stop()
+	for {
+		select {
+		case <-u.ctx.Done():
+			return
+		case <-timer.C:
+		}
+		now := time.Now()
+		var updated bool
+		for i, ruleSet := range u.ruleSets {
+			if now.Before(nextUpdates[i]) {
+				continue
+			}
+			ruleSet.updateOnce()
+			nextUpdates[i] = now.Add(ruleSet.updateInterval)
+			updated = true
+		}
+		if updated {
+			runtime.GC()
+		}
+		timer.Reset(waitUntilNext(nextUpdates))
+	}
+}
+
+func waitUntilNext(nextUpdates []time.Time) time.Duration {
+	next := nextUpdates[0]
+	for _, nextUpdate := range nextUpdates[1:] {
+		if nextUpdate.Before(next) {
+			next = nextUpdate
+		}
+	}
+	wait := time.Until(next)
+	if wait < 0 {
+		return 0
+	}
+	return wait
+}