Improve: provider can be auto GC

adapters/provider/fetcher.go

@@ -0,0 +1,154 @@
+package provider
+
+import (
+	"bytes"
+	"crypto/md5"
+	"io/ioutil"
+	"os"
+	"time"
+
+	"github.com/Dreamacro/clash/log"
+)
+
+var (
+	fileMode os.FileMode = 0666
+)
+
+type parser = func([]byte) (interface{}, error)
+
+type fetcher struct {
+	name      string
+	vehicle   Vehicle
+	updatedAt *time.Time
+	ticker    *time.Ticker
+	hash      [16]byte
+	parser    parser
+	onUpdate  func(interface{})
+}
+
+func (f *fetcher) Name() string {
+	return f.name
+}
+
+func (f *fetcher) VehicleType() VehicleType {
+	return f.vehicle.Type()
+}
+
+func (f *fetcher) Initial() (interface{}, error) {
+	var buf []byte
+	var err error
+	var isLocal bool
+	if stat, err := os.Stat(f.vehicle.Path()); err == nil {
+		buf, err = ioutil.ReadFile(f.vehicle.Path())
+		modTime := stat.ModTime()
+		f.updatedAt = &modTime
+		isLocal = true
+	} else {
+		buf, err = f.vehicle.Read()
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	proxies, err := f.parser(buf)
+	if err != nil {
+		if !isLocal {
+			return nil, err
+		}
+
+		// parse local file error, fallback to remote
+		buf, err = f.vehicle.Read()
+		if err != nil {
+			return nil, err
+		}
+
+		proxies, err = f.parser(buf)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if err := ioutil.WriteFile(f.vehicle.Path(), buf, fileMode); err != nil {
+		return nil, err
+	}
+
+	f.hash = md5.Sum(buf)
+
+	// pull proxies automatically
+	if f.ticker != nil {
+		go f.pullLoop()
+	}
+
+	return proxies, nil
+}
+
+func (f *fetcher) Update() (interface{}, bool, error) {
+	buf, err := f.vehicle.Read()
+	if err != nil {
+		return nil, false, err
+	}
+
+	now := time.Now()
+	hash := md5.Sum(buf)
+	if bytes.Equal(f.hash[:], hash[:]) {
+		f.updatedAt = &now
+		return nil, true, nil
+	}
+
+	proxies, err := f.parser(buf)
+	if err != nil {
+		return nil, false, err
+	}
+
+	if err := ioutil.WriteFile(f.vehicle.Path(), buf, fileMode); err != nil {
+		return nil, false, err
+	}
+
+	f.updatedAt = &now
+	f.hash = hash
+
+	return proxies, false, nil
+}
+
+func (f *fetcher) Destroy() error {
+	if f.ticker != nil {
+		f.ticker.Stop()
+	}
+	return nil
+}
+
+func (f *fetcher) pullLoop() {
+	for range f.ticker.C {
+		elm, same, err := f.Update()
+		if err != nil {
+			log.Warnln("[Provider] %s pull error: %s", f.Name(), err.Error())
+			continue
+		}
+
+		if same {
+			log.Debugln("[Provider] %s's proxies doesn't change", f.Name())
+			continue
+		}
+
+		log.Infoln("[Provider] %s's proxies update", f.Name())
+		if f.onUpdate != nil {
+			f.onUpdate(elm)
+		}
+	}
+}
+
+func newFetcher(name string, interval time.Duration, vehicle Vehicle, parser parser, onUpdate func(interface{})) *fetcher {
+	var ticker *time.Ticker
+	if interval != 0 {
+		ticker = time.NewTicker(interval)
+	}
+
+	return &fetcher{
+		name:     name,
+		ticker:   ticker,
+		vehicle:  vehicle,
+		parser:   parser,
+		onUpdate: onUpdate,
+	}
+}

adapters/provider/provider.go

@@ -1,26 +1,20 @@
 package provider
 
 import (
-	"bytes"
-	"crypto/md5"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
-	"os"
+	"runtime"
 	"time"
 
 	"github.com/Dreamacro/clash/adapters/outbound"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/log"
 
 	"gopkg.in/yaml.v2"
 )
 
 const (
 	ReservedName = "default"
-
-	fileMode = 0666
 )
 
 // Provider Type
@@ -49,8 +43,7 @@ type Provider interface {
 	VehicleType() VehicleType
 	Type() ProviderType
 	Initial() error
-	Reload() error
-	Destroy() error
+	Update() error
 }
 
 // ProxyProvider interface
@@ -58,24 +51,24 @@ type ProxyProvider interface {
 	Provider
 	Proxies() []C.Proxy
 	HealthCheck()
-	Update() error
 }
 
 type ProxySchema struct {
 	Proxies []map[string]interface{} `yaml:"proxies"`
 }
 
+// for auto gc
 type ProxySetProvider struct {
-	name        string
-	vehicle     Vehicle
-	hash        [16]byte
-	proxies     []C.Proxy
-	healthCheck *HealthCheck
-	ticker      *time.Ticker
-	updatedAt   *time.Time
+	*proxySetProvider
 }
 
-func (pp *ProxySetProvider) MarshalJSON() ([]byte, error) {
+type proxySetProvider struct {
+	*fetcher
+	proxies     []C.Proxy
+	healthCheck *HealthCheck
+}
+
+func (pp *proxySetProvider) MarshalJSON() ([]byte, error) {
 	return json.Marshal(map[string]interface{}{
 		"name":        pp.Name(),
 		"type":        pp.Type().String(),
@@ -85,134 +78,41 @@ func (pp *ProxySetProvider) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func (pp *ProxySetProvider) Name() string {
+func (pp *proxySetProvider) Name() string {
 	return pp.name
 }
 
-func (pp *ProxySetProvider) Reload() error {
-	return nil
-}
-
-func (pp *ProxySetProvider) HealthCheck() {
+func (pp *proxySetProvider) HealthCheck() {
 	pp.healthCheck.check()
 }
 
-func (pp *ProxySetProvider) Update() error {
-	return pp.pull()
+func (pp *proxySetProvider) Update() error {
+	elm, same, err := pp.fetcher.Update()
+	if err == nil && !same {
+		pp.onUpdate(elm)
+	}
+	return err
 }
 
-func (pp *ProxySetProvider) Destroy() error {
-	pp.healthCheck.close()
-
-	if pp.ticker != nil {
-		pp.ticker.Stop()
-	}
-
-	return nil
-}
-
-func (pp *ProxySetProvider) Initial() error {
-	var buf []byte
-	var err error
-	var isLocal bool
-	if stat, err := os.Stat(pp.vehicle.Path()); err == nil {
-		buf, err = ioutil.ReadFile(pp.vehicle.Path())
-		modTime := stat.ModTime()
-		pp.updatedAt = &modTime
-		isLocal = true
-	} else {
-		buf, err = pp.vehicle.Read()
-	}
-
+func (pp *proxySetProvider) Initial() error {
+	elm, err := pp.fetcher.Initial()
 	if err != nil {
 		return err
 	}
 
-	proxies, err := pp.parse(buf)
-	if err != nil {
-		if !isLocal {
-			return err
-		}
-
-		// parse local file error, fallback to remote
-		buf, err = pp.vehicle.Read()
-		if err != nil {
-			return err
-		}
-
-		proxies, err = pp.parse(buf)
-		if err != nil {
-			return err
-		}
-	}
-
-	if err := ioutil.WriteFile(pp.vehicle.Path(), buf, fileMode); err != nil {
-		return err
-	}
-
-	pp.hash = md5.Sum(buf)
-	pp.setProxies(proxies)
-
-	// pull proxies automatically
-	if pp.ticker != nil {
-		go pp.pullLoop()
-	}
-
+	pp.onUpdate(elm)
 	return nil
 }
 
-func (pp *ProxySetProvider) VehicleType() VehicleType {
-	return pp.vehicle.Type()
-}
-
-func (pp *ProxySetProvider) Type() ProviderType {
+func (pp *proxySetProvider) Type() ProviderType {
 	return Proxy
 }
 
-func (pp *ProxySetProvider) Proxies() []C.Proxy {
+func (pp *proxySetProvider) Proxies() []C.Proxy {
 	return pp.proxies
 }
 
-func (pp *ProxySetProvider) pullLoop() {
-	for range pp.ticker.C {
-		if err := pp.pull(); err != nil {
-			log.Warnln("[Provider] %s pull error: %s", pp.Name(), err.Error())
-		}
-	}
-}
-
-func (pp *ProxySetProvider) pull() error {
-	buf, err := pp.vehicle.Read()
-	if err != nil {
-		return err
-	}
-
-	now := time.Now()
-	hash := md5.Sum(buf)
-	if bytes.Equal(pp.hash[:], hash[:]) {
-		log.Debugln("[Provider] %s's proxies doesn't change", pp.Name())
-		pp.updatedAt = &now
-		return nil
-	}
-
-	proxies, err := pp.parse(buf)
-	if err != nil {
-		return err
-	}
-	log.Infoln("[Provider] %s's proxies update", pp.Name())
-
-	if err := ioutil.WriteFile(pp.vehicle.Path(), buf, fileMode); err != nil {
-		return err
-	}
-
-	pp.updatedAt = &now
-	pp.hash = hash
-	pp.setProxies(proxies)
-
-	return nil
-}
-
-func (pp *ProxySetProvider) parse(buf []byte) ([]C.Proxy, error) {
+func proxiesParse(buf []byte) (interface{}, error) {
 	schema := &ProxySchema{}
 
 	if err := yaml.Unmarshal(buf, schema); err != nil {
@@ -239,38 +139,52 @@ func (pp *ProxySetProvider) parse(buf []byte) ([]C.Proxy, error) {
 	return proxies, nil
 }
 
-func (pp *ProxySetProvider) setProxies(proxies []C.Proxy) {
+func (pp *proxySetProvider) setProxies(proxies []C.Proxy) {
 	pp.proxies = proxies
 	pp.healthCheck.setProxy(proxies)
 	go pp.healthCheck.check()
 }
 
-func NewProxySetProvider(name string, interval time.Duration, vehicle Vehicle, hc *HealthCheck) *ProxySetProvider {
-	var ticker *time.Ticker
-	if interval != 0 {
-		ticker = time.NewTicker(interval)
-	}
+func stopProxyProvider(pd *ProxySetProvider) {
+	pd.healthCheck.close()
+	pd.fetcher.Destroy()
+}
 
+func NewProxySetProvider(name string, interval time.Duration, vehicle Vehicle, hc *HealthCheck) *ProxySetProvider {
 	if hc.auto() {
 		go hc.process()
 	}
 
-	return &ProxySetProvider{
-		name:        name,
-		vehicle:     vehicle,
+	pd := &proxySetProvider{
 		proxies:     []C.Proxy{},
 		healthCheck: hc,
-		ticker:      ticker,
 	}
+
+	onUpdate := func(elm interface{}) {
+		ret := elm.([]C.Proxy)
+		pd.setProxies(ret)
+	}
+
+	fetcher := newFetcher(name, interval, vehicle, proxiesParse, onUpdate)
+	pd.fetcher = fetcher
+
+	wrapper := &ProxySetProvider{pd}
+	runtime.SetFinalizer(wrapper, stopProxyProvider)
+	return wrapper
 }
 
+// for auto gc
 type CompatibleProvider struct {
+	*compatibleProvider
+}
+
+type compatibleProvider struct {
 	name        string
 	healthCheck *HealthCheck
 	proxies     []C.Proxy
 }
 
-func (cp *CompatibleProvider) MarshalJSON() ([]byte, error) {
+func (cp *compatibleProvider) MarshalJSON() ([]byte, error) {
 	return json.Marshal(map[string]interface{}{
 		"name":        cp.Name(),
 		"type":        cp.Type().String(),
@@ -279,43 +193,38 @@ func (cp *CompatibleProvider) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func (cp *CompatibleProvider) Name() string {
+func (cp *compatibleProvider) Name() string {
 	return cp.name
 }
 
-func (cp *CompatibleProvider) Reload() error {
-	return nil
-}
-
-func (cp *CompatibleProvider) Destroy() error {
-	cp.healthCheck.close()
-	return nil
-}
-
-func (cp *CompatibleProvider) HealthCheck() {
+func (cp *compatibleProvider) HealthCheck() {
 	cp.healthCheck.check()
 }
 
-func (cp *CompatibleProvider) Update() error {
+func (cp *compatibleProvider) Update() error {
 	return nil
 }
 
-func (cp *CompatibleProvider) Initial() error {
+func (cp *compatibleProvider) Initial() error {
 	return nil
 }
 
-func (cp *CompatibleProvider) VehicleType() VehicleType {
+func (cp *compatibleProvider) VehicleType() VehicleType {
 	return Compatible
 }
 
-func (cp *CompatibleProvider) Type() ProviderType {
+func (cp *compatibleProvider) Type() ProviderType {
 	return Proxy
 }
 
-func (cp *CompatibleProvider) Proxies() []C.Proxy {
+func (cp *compatibleProvider) Proxies() []C.Proxy {
 	return cp.proxies
 }
 
+func stopCompatibleProvider(pd *CompatibleProvider) {
+	pd.healthCheck.close()
+}
+
 func NewCompatibleProvider(name string, proxies []C.Proxy, hc *HealthCheck) (*CompatibleProvider, error) {
 	if len(proxies) == 0 {
 		return nil, errors.New("Provider need one proxy at least")
@@ -325,9 +234,13 @@ func NewCompatibleProvider(name string, proxies []C.Proxy, hc *HealthCheck) (*Co
 		go hc.process()
 	}
 
-	return &CompatibleProvider{
+	pd := &compatibleProvider{
 		name:        name,
 		proxies:     proxies,
 		healthCheck: hc,
-	}, nil
+	}
+
+	wrapper := &CompatibleProvider{pd}
+	runtime.SetFinalizer(wrapper, stopCompatibleProvider)
+	return wrapper, nil
 }

config/config.go

@@ -268,15 +268,6 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 		providersConfig = cfg.ProxyProviderOld
 	}
 
-	defer func() {
-		// Destroy already created provider when err != nil
-		if err != nil {
-			for _, provider := range providersMap {
-				provider.Destroy()
-			}
-		}
-	}()
-
 	proxies["DIRECT"] = outbound.NewProxy(outbound.NewDirect())
 	proxies["REJECT"] = outbound.NewProxy(outbound.NewReject())
 	proxyList = append(proxyList, "DIRECT", "REJECT")

hub/executor/executor.go

@@ -158,13 +158,6 @@ func updateHosts(tree *trie.Trie) {
 }
 
 func updateProxies(proxies map[string]C.Proxy, providers map[string]provider.ProxyProvider) {
-	oldProviders := tunnel.Providers()
-
-	// close providers goroutine
-	for _, provider := range oldProviders {
-		provider.Destroy()
-	}
-
 	tunnel.UpdateProxies(proxies, providers)
 }