Move stats code into its own module.

Move RTP-specific code into its own file.

stats/stats.go

@@ -0,0 +1,73 @@
+package stats
+
+import (
+	"sort"
+	"time"
+
+	"sfu/group"
+)
+
+type GroupStats struct {
+	Name    string
+	Clients []*Client
+}
+
+type Client struct {
+	Id       string
+	Up, Down []Conn
+}
+
+type Statable interface {
+	GetStats() *Client
+}
+
+type Conn struct {
+	Id         string
+	MaxBitrate uint64
+	Tracks     []Track
+}
+
+type Track struct {
+	Bitrate    uint64
+	MaxBitrate uint64
+	Loss       uint8
+	Rtt        time.Duration
+	Jitter     time.Duration
+}
+
+func GetGroups() []GroupStats {
+	names := group.GetNames()
+
+	gs := make([]GroupStats, 0, len(names))
+	for _, name := range names {
+		g := group.Get(name)
+		if g == nil {
+			continue
+		}
+		clients := g.GetClients(nil)
+		stats := GroupStats{
+			Name:    name,
+			Clients: make([]*Client, 0, len(clients)),
+		}
+		for _, c := range clients {
+			s, ok := c.(Statable)
+			if ok {
+				cs := s.GetStats()
+				stats.Clients = append(stats.Clients, cs)
+			} else {
+				stats.Clients = append(stats.Clients,
+					&Client{Id: c.Id()},
+				)
+			}
+		}
+		sort.Slice(stats.Clients, func(i, j int) bool {
+			return stats.Clients[i].Id < stats.Clients[j].Id
+		})
+		gs = append(gs, stats)
+	}
+	sort.Slice(gs, func(i, j int) bool {
+		return gs[i].Name < gs[j].Name
+	})
+
+	return gs
+}