fix: packet loss calc method (#206)

* add(api): add Hosts for servers

* fix(api): calc packet loss with mixed PLoss

* chore(cli): lint error

example/packet_loss/main.go

@@ -26,9 +26,7 @@ func main() {
 
 	wg := &sync.WaitGroup{}
 	// 3. Perform packet loss analysis on all available servers
-	var hosts []string
 	for _, server := range *targets {
-		hosts = append(hosts, server.Host)
 		wg.Add(1)
 		//ctx, cancel := context.WithTimeout(context.Background(), time.Second*20)
 		//go func(server *speedtest.Server, analyzer *speedtest.PacketLossAnalyzer, ctx context.Context, cancel context.CancelFunc) {
@@ -52,7 +50,7 @@ func main() {
 	wg.Wait()
 
 	// use mixed PacketLoss
-	mixed, err := analyzer.RunMulti(hosts)
+	mixed, err := analyzer.RunMulti(serverList.Hosts())
 	checkError(err)
 	fmt.Printf("Mixed packets lossed: %.2f\n", mixed)
 }

speedtest.go

@@ -136,7 +136,7 @@ func main() {
 		})
 
 		// 3.0 create a packet loss analyzer, use default options
-		var analyzer = speedtest.NewPacketLossAnalyzer(&speedtest.PacketLossAnalyzerOptions{
+		analyzer := speedtest.NewPacketLossAnalyzer(&speedtest.PacketLossAnalyzerOptions{
 			SourceInterface: *source,
 		})
 

speedtest/loss.go

@@ -68,18 +68,17 @@ func (pla *PacketLossAnalyzer) RunMulti(hosts []string) (float64, error) {
 }
 
 func (pla *PacketLossAnalyzer) RunMultiWithContext(ctx context.Context, hosts []string) (float64, error) {
-	results := make(map[string]float64)
+	results := make(map[string]*transport.PLoss)
 	mutex := &sync.Mutex{}
 	wg := &sync.WaitGroup{}
 	for _, host := range hosts {
 		wg.Add(1)
 		go func(h string) {
 			defer wg.Done()
 			_ = pla.RunWithContext(ctx, h, func(packetLoss *transport.PLoss) {
-				loss := packetLoss.Loss()
-				if loss != -1 {
+				if packetLoss.Sent != 0 {
 					mutex.Lock()
-					results[h] = loss
+					results[h] = packetLoss
 					mutex.Unlock()
 				}
 			})
@@ -89,11 +88,13 @@ func (pla *PacketLossAnalyzer) RunMultiWithContext(ctx context.Context, hosts []
 	if len(results) == 0 {
 		return -1, transport.ErrUnsupported
 	}
-	packetLossAvg := 0.0
+	var pLoss transport.PLoss
 	for _, hostPacketLoss := range results {
-		packetLossAvg += hostPacketLoss
+		pLoss.Sent += hostPacketLoss.Sent
+		pLoss.Dup += hostPacketLoss.Dup
+		pLoss.Max += hostPacketLoss.Max
 	}
-	return packetLossAvg / float64(len(results)), nil
+	return pLoss.Loss(), nil
 }
 
 func (pla *PacketLossAnalyzer) Run(host string, callback func(packetLoss *transport.PLoss)) error {

speedtest/server.go

@@ -133,6 +133,15 @@ func (servers Servers) Swap(i, j int) {
 	servers[i], servers[j] = servers[j], servers[i]
 }
 
+// Hosts return hosts of servers
+func (servers Servers) Hosts() []string {
+	var retServer []string
+	for _, server := range servers {
+		retServer = append(retServer, server.Host)
+	}
+	return retServer
+}
+
 // Less compares the distance. For sorting servers.
 func (b ByDistance) Less(i, j int) bool {
 	return b.Servers[i].Distance < b.Servers[j].Distance