metric: clear useless proxy statistics data

server/control.go

@@ -268,7 +268,7 @@ func (ctl *Control) stoper() {
 	for _, pxy := range ctl.proxies {
 		pxy.Close()
 		ctl.svr.DelProxy(pxy.GetName())
-		StatsCloseProxy(pxy.GetConf().GetBaseInfo().ProxyType)
+		StatsCloseProxy(pxy.GetName(), pxy.GetConf().GetBaseInfo().ProxyType)
 	}
 
 	ctl.allShutdown.Done()

server/metric.go

@@ -16,8 +16,10 @@ package server
 
 import (
 	"sync"
+	"time"
 
 	"github.com/fatedier/frp/models/config"
+	"github.com/fatedier/frp/utils/log"
 	"github.com/fatedier/frp/utils/metric"
 )
 
@@ -46,10 +48,13 @@ type ServerStatistics struct {
 }
 
 type ProxyStatistics struct {
+	Name          string
 	ProxyType     string
 	TrafficIn     metric.DateCounter
 	TrafficOut    metric.DateCounter
 	CurConns      metric.Counter
+	LastStartTime time.Time
+	LastCloseTime time.Time
 }
 
 func init() {
@@ -63,6 +68,27 @@ func init() {
 
 		ProxyStatistics: make(map[string]*ProxyStatistics),
 	}
+
+	go func() {
+		for {
+			time.Sleep(12 * time.Hour)
+			log.Debug("start to clear useless proxy statistics data...")
+			StatsClearUselessInfo()
+			log.Debug("finish to clear useless proxy statistics data")
+		}
+	}()
+}
+
+func StatsClearUselessInfo() {
+	// To check if there are proxies that closed than 7 days and drop them.
+	globalStats.mu.Lock()
+	defer globalStats.mu.Unlock()
+	for name, data := range globalStats.ProxyStatistics {
+		if !data.LastCloseTime.IsZero() && time.Since(data.LastCloseTime) > time.Duration(7*24)*time.Hour {
+			delete(globalStats.ProxyStatistics, name)
+			log.Trace("clear proxy [%s]'s statistics data, lastCloseTime: [%s]", name, data.LastCloseTime.String())
+		}
+	}
 }
 
 func StatsNewClient() {
@@ -91,23 +117,28 @@ func StatsNewProxy(name string, proxyType string) {
 		proxyStats, ok := globalStats.ProxyStatistics[name]
 		if !(ok && proxyStats.ProxyType == proxyType) {
 			proxyStats = &ProxyStatistics{
+				Name:          name,
 				ProxyType:     proxyType,
 				CurConns:      metric.NewCounter(),
 				TrafficIn:     metric.NewDateCounter(ReserveDays),
 				TrafficOut:    metric.NewDateCounter(ReserveDays),
+				LastStartTime: time.Now(),
 			}
 			globalStats.ProxyStatistics[name] = proxyStats
 		}
 	}
 }
 
-func StatsCloseProxy(proxyType string) {
+func StatsCloseProxy(proxyName string, proxyType string) {
 	if config.ServerCommonCfg.DashboardPort != 0 {
 		globalStats.mu.Lock()
 		defer globalStats.mu.Unlock()
 		if counter, ok := globalStats.ProxyTypeCounts[proxyType]; ok {
 			counter.Dec(1)
 		}
+		if proxyStats, ok := globalStats.ProxyStatistics[proxyName]; ok {
+			proxyStats.LastCloseTime = time.Now()
+		}
 	}
 }