Improve: provider api

adapters/outbound/base.go

@@ -142,6 +142,7 @@ func (p *Proxy) MarshalJSON() ([]byte, error) {
 	mapping := map[string]interface{}{}
 	json.Unmarshal(inner, &mapping)
 	mapping["history"] = p.DelayHistory()
+	mapping["name"] = p.Name()
 	return json.Marshal(mapping)
 }
 

adapters/provider/provider.go

@@ -60,6 +60,7 @@ type ProxyProvider interface {
 	Provider
 	Proxies() []C.Proxy
 	HealthCheck()
+	Update() error
 }
 
 type ProxySchema struct {
@@ -106,6 +107,10 @@ func (pp *ProxySetProvider) HealthCheck() {
 	}
 }
 
+func (pp *ProxySetProvider) Update() error {
+	return pp.pull()
+}
+
 func (pp *ProxySetProvider) Destroy() error {
 	pp.mux.Lock()
 	defer pp.mux.Unlock()
@@ -124,8 +129,10 @@ func (pp *ProxySetProvider) Destroy() error {
 func (pp *ProxySetProvider) Initial() error {
 	var buf []byte
 	var err error
-	if _, err := os.Stat(pp.vehicle.Path()); err == nil {
+	if stat, err := os.Stat(pp.vehicle.Path()); err == nil {
 		buf, err = ioutil.ReadFile(pp.vehicle.Path())
+		modTime := stat.ModTime()
+		pp.updatedAt = &modTime
 	} else {
 		buf, err = pp.vehicle.Read()
 	}
@@ -180,9 +187,11 @@ func (pp *ProxySetProvider) pull() error {
 		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
 	}
 
@@ -196,7 +205,6 @@ func (pp *ProxySetProvider) pull() error {
 		return err
 	}
 
-	now := time.Now()
 	pp.updatedAt = &now
 	pp.hash = hash
 	pp.setProxies(proxies)
@@ -224,6 +232,10 @@ func (pp *ProxySetProvider) parse(buf []byte) ([]C.Proxy, error) {
 		proxies = append(proxies, proxy)
 	}
 
+	if len(proxies) == 0 {
+		return nil, errors.New("File doesn't have any valid proxy")
+	}
+
 	return proxies, nil
 }
 
@@ -291,6 +303,10 @@ func (cp *CompatibleProvier) HealthCheck() {
 	}
 }
 
+func (cp *CompatibleProvier) Update() error {
+	return nil
+}
+
 func (cp *CompatibleProvier) Initial() error {
 	if cp.healthCheck != nil {
 		go cp.healthCheck.process()