feat: balancer dashboard metrics + fix WebSocket Hijacker

cmd/pulse-lets-go/main.go

@@ -177,6 +177,19 @@ func main() {
 		}
 	}()
 
+	// 6.2 Periodic WS broadcast + FS stats poll
+	go func() {
+		ticker := time.NewTicker(5 * time.Second)
+		for range ticker.C {
+			if eslClient != nil && eslClient.IsConnected() {
+				if stats, err := eslClient.FetchFsStats(); err == nil {
+					apiHandler.UpdateFsStats(stats)
+				}
+			}
+			apiHandler.BroadcastAll()
+		}
+	}()
+
 	// Подключаем раздачу SvelteKit статики, если директория существует
 	webDir := findWebDir(exeDir)
 	if webDir != "" {

internal/api/logging.go

@@ -1,10 +1,13 @@
 package api
 
 import (
+	"bufio"
 	"crypto/rand"
 	"encoding/hex"
 	"encoding/json"
+	"fmt"
 	"log"
+	"net"
 	"net/http"
 	"time"
 )
@@ -82,3 +85,11 @@ func (w *loggingResponseWriter) WriteHeader(code int) {
 func (w *loggingResponseWriter) Write(b []byte) (int, error) {
 	return w.ResponseWriter.Write(b)
 }
+
+func (w *loggingResponseWriter) Hijack() (net.Conn, *bufio.ReadWriter, error) {
+	hijacker, ok := w.ResponseWriter.(http.Hijacker)
+	if !ok {
+		return nil, nil, fmt.Errorf("loggingResponseWriter: underlying ResponseWriter does not implement http.Hijacker")
+	}
+	return hijacker.Hijack()
+}

internal/api/route.go

@@ -14,6 +14,7 @@ func (a *API) handleRoute(w http.ResponseWriter, r *http.Request) {
 
 	// Нет зарегистрированных нод
 	if nodeID == "" {
+		a.engine.IncrementRouteFallbacks()
 		writeJSON(w, http.StatusServiceUnavailable, models.RouteResponse{
 			Error: "no_nodes_registered",
 		})
@@ -22,6 +23,7 @@ func (a *API) handleRoute(w http.ResponseWriter, r *http.Request) {
 
 	// Все ноды unhealthy — fallback
 	if fallback || score < 0 {
+		a.engine.IncrementRouteFallbacks()
 		fallbackGW, _ := a.findFallbackGateway()
 		nodes := a.getRouteNodeInfo()
 

internal/api/router.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"sync"
 
 	"github.com/pulse-lets-go/internal/config"
 	"github.com/pulse-lets-go/internal/engine"
@@ -23,6 +24,11 @@ type API struct {
 	logFormat        string
 	routeLimiter     *rateLimiter
 	apiLimiter       *rateLimiter
+
+	gatewayMu     sync.RWMutex
+	gatewayStates map[string]string // trunkID → "up"/"down"
+	fsStats       esl.FsStats
+	fsStatsMu     sync.RWMutex
 }
 
 // NewAPI создаёт новый HTTP API с заданными зависимостями.
@@ -35,6 +41,7 @@ func NewAPI(eng *engine.Engine, cfgMgr *config.Manager, jwtSecret, monitoringAPI
 		wsHub:            newWSHub(),
 		natsConnected:    natsFn,
 		logFormat:        cfg.Log.Format,
+		gatewayStates:    make(map[string]string),
 	}
 	if cfg.RateLimit.Enabled {
 		a.routeLimiter = newRateLimiter(cfg.RateLimit.RoutePerSec, cfg.RateLimit.RoutePerSec)
@@ -130,6 +137,10 @@ func corsMiddleware(next http.Handler) http.Handler {
 
 // BroadcastGatewayEvent транслирует статус gateway всем WS-клиентам.
 func (a *API) BroadcastGatewayEvent(gatewayName, trunkID, status string) {
+	a.gatewayMu.Lock()
+	a.gatewayStates[trunkID] = status
+	a.gatewayMu.Unlock()
+
 	msg := &models.WsMetricsMessage{
 		Type: "gateway_update",
 		Payload: map[string]string{
@@ -141,6 +152,28 @@ func (a *API) BroadcastGatewayEvent(gatewayName, trunkID, status string) {
 	a.wsHub.broadcast(msg)
 }
 
+func (a *API) gatewayStats() (total, up, down int) {
+	a.gatewayMu.RLock()
+	defer a.gatewayMu.RUnlock()
+	for _, s := range a.gatewayStates {
+		total++
+		switch s {
+		case "up":
+			up++
+		case "down":
+			down++
+		}
+	}
+	return
+}
+
+// UpdateFsStats обновляет кэш метрик FreeSWITCH (вызывается из ticker).
+func (a *API) UpdateFsStats(stats esl.FsStats) {
+	a.fsStatsMu.Lock()
+	a.fsStats = stats
+	a.fsStatsMu.Unlock()
+}
+
 // maxBodySize — максимальный размер тела запроса в байтах (1 MiB).
 const maxBodySize = 1 << 20
 

internal/api/ws.go

@@ -104,12 +104,7 @@ func (a *API) handleWS(w http.ResponseWriter, r *http.Request) {
 
 	// Отправляем текущее состояние при подключении
 	go func() {
-		nodes := a.engine.GetAllNodes()
+		a.BroadcastAll()
-		msg := &models.WsMetricsMessage{
-			Type:    "nodes_update",
-			Payload: nodes,
-		}
-		a.wsHub.broadcast(msg)
 	}()
 
 	// Читаем из вебсокета (ping/pong + закрытие)
@@ -125,7 +120,7 @@ func (a *API) handleWS(w http.ResponseWriter, r *http.Request) {
 	}()
 }
 
-// BroadcastMetrics рассылает метрики всем WS-клиентам (вызывается engine при обновлении).
+// BroadcastMetrics рассылает метрики нод всем WS-клиентам.
 func (a *API) BroadcastMetrics() {
 	nodes := a.engine.GetAllNodes()
 	msg := &models.WsMetricsMessage{
@@ -135,6 +130,46 @@ func (a *API) BroadcastMetrics() {
 	a.wsHub.broadcast(msg)
 }
 
+// BroadcastAll рассылает ноды и состояние балансировщика.
+func (a *API) BroadcastAll() {
+	a.BroadcastMetrics()
+	a.broadcastBalancerUpdate()
+}
+
+func (a *API) broadcastBalancerUpdate() {
+	stats := a.engine.GetHealthStats()
+	gwTotal, gwUp, gwDown := a.gatewayStats()
+
+	info := models.BalancerInfo{
+		NatsConnected:  a.natsConnected != nil && a.natsConnected(),
+		GatewaysTotal:  gwTotal,
+		GatewaysUp:     gwUp,
+		GatewaysDown:   gwDown,
+		RouteTotal:     stats.RouteRequests,
+		RouteFallbacks: stats.RouteFallbacks,
+		UptimeSec:      stats.UptimeSeconds,
+	}
+
+	if a.eslClient != nil {
+		eslStats := a.eslClient.GetStats()
+		info.EslConnected = eslStats.Status == "connected"
+		info.EslUptimeSec = eslStats.UptimeSec
+		info.EslReconnects = eslStats.Reconnects
+
+		a.fsStatsMu.RLock()
+		info.FsActiveCalls = a.fsStats.ActiveCalls
+		info.FsMaxSessions = a.fsStats.MaxSessions
+		info.FsUptime = a.fsStats.FsUptime
+		a.fsStatsMu.RUnlock()
+	}
+
+	msg := &models.WsMetricsMessage{
+		Type:    "balancer_update",
+		Payload: info,
+	}
+	a.wsHub.broadcast(msg)
+}
+
 // validateToken проверяет JWT и возвращает UserInfo.
 func (a *API) validateToken(tokenStr string) (*UserInfo, error) {
 	token, err := parseJWT(tokenStr, a.jwtSecret)

internal/engine/engine.go

@@ -29,6 +29,7 @@ type Engine struct {
 	// Статистика для health endpoint
 	startTime      time.Time
 	routeRequests  atomic.Int64
+	routeFallbacks atomic.Int64
 	lastMetricTime atomic.Int64 // unix ts последней полученной метрики
 }
 
@@ -188,11 +189,17 @@ func (e *Engine) IncrementRouteRequests() {
 	e.routeRequests.Add(1)
 }
 
+// IncrementRouteFallbacks увеличивает счётчик fallback-запросов.
+func (e *Engine) IncrementRouteFallbacks() {
+	e.routeFallbacks.Add(1)
+}
+
 // HealthStats возвращает статистику для health endpoint.
 type HealthStats struct {
 	TotalNodes     int   `json:"total_nodes"`
 	HealthyNodes   int   `json:"healthy_nodes"`
 	RouteRequests  int64 `json:"route_requests_total"`
+	RouteFallbacks int64 `json:"route_fallbacks_total"`
 	UptimeSeconds  int64 `json:"uptime_seconds"`
 	LastMetricTS   int64 `json:"last_metric_ts"`
 }
@@ -212,6 +219,7 @@ func (e *Engine) GetHealthStats() HealthStats {
 		TotalNodes:     len(e.nodes),
 		HealthyNodes:   healthy,
 		RouteRequests:  e.routeRequests.Load(),
+		RouteFallbacks: e.routeFallbacks.Load(),
 		UptimeSeconds:  int64(time.Since(e.startTime).Seconds()),
 		LastMetricTS:   e.lastMetricTime.Load(),
 	}

internal/esl/client.go

@@ -401,3 +401,70 @@ func (c *Client) GetStats() Stats {
 func (c *Client) IncGatewayOps() {
 	c.gatewayOps.Add(1)
 }
+
+// --- FS stats ---
+
+// FsStats — показатели FreeSWITCH балансировщика.
+type FsStats struct {
+	ActiveCalls int
+	MaxSessions int
+	FsUptime    string
+}
+
+// FetchFsStats запрашивает метрики FreeSWITCH через api команды.
+func (c *Client) FetchFsStats() (FsStats, error) {
+	if !c.connected.Load() {
+		return FsStats{}, fmt.Errorf("esl не подключён")
+	}
+	var stats FsStats
+
+	_, body, err := c.Send("api show calls count")
+	if err != nil {
+		return FsStats{}, err
+	}
+	stats.ActiveCalls = parseFirstInt(body)
+
+	_, body, err = c.Send("api status")
+	if err != nil {
+		return stats, err
+	}
+	stats.MaxSessions = parseMaxSessions(body)
+	stats.FsUptime = parseUptime(body)
+
+	return stats, nil
+}
+
+func parseFirstInt(s string) int {
+	s = strings.TrimSpace(s)
+	for i, c := range s {
+		if c < '0' || c > '9' {
+			if i == 0 {
+				return 0
+			}
+			v, err := strconv.Atoi(s[:i])
+			if err != nil {
+				return 0
+			}
+			return v
+		}
+	}
+	return 0
+}
+
+func parseMaxSessions(body string) int {
+	for _, line := range strings.Split(body, "\n") {
+		if strings.Contains(line, "session(s) max") {
+			return parseFirstInt(line)
+		}
+	}
+	return 0
+}
+
+func parseUptime(body string) string {
+	for _, line := range strings.Split(body, "\n") {
+		if strings.HasPrefix(line, "UP ") {
+			return strings.TrimPrefix(line, "UP ")
+		}
+	}
+	return ""
+}

internal/models/types.go

@@ -209,10 +209,29 @@ type ZabbixResponse struct {
 	Data []ZabbixNode `json:"data"`
 }
 
+// --- Balancer ---
+
+// BalancerInfo — состояние балансировщика для дашборда.
+type BalancerInfo struct {
+	EslConnected   bool   `json:"esl_connected"`
+	EslUptimeSec   int64  `json:"esl_uptime_sec,omitempty"`
+	EslReconnects  int64  `json:"esl_reconnects,omitempty"`
+	NatsConnected  bool   `json:"nats_connected"`
+	GatewaysTotal  int    `json:"gateways_total"`
+	GatewaysUp     int    `json:"gateways_up"`
+	GatewaysDown   int    `json:"gateways_down"`
+	FsActiveCalls  int    `json:"fs_active_calls"`
+	FsMaxSessions  int    `json:"fs_max_sessions"`
+	FsUptime       string `json:"fs_uptime"`
+	RouteTotal     int64  `json:"route_total"`
+	RouteFallbacks int64  `json:"route_fallbacks"`
+	UptimeSec      int64  `json:"uptime_sec"`
+}
+
 // --- WebSocket ---
 
 // WsMetricsMessage — сообщение, отправляемое по WebSocket.
 type WsMetricsMessage struct {
-	Type    string      `json:"type"` // "nodes_update", "node_toggle", etc
+	Type    string      `json:"type"` // "nodes_update", "balancer_update", "gateway_update", etc
 	Payload interface{} `json:"payload"`
 }

web/src/lib/api.ts

@@ -184,6 +184,22 @@ export async function deleteUser(id: string) {
 }
 
 // --- WebSocket ---
+export interface BalancerInfo {
+  esl_connected: boolean;
+  esl_uptime_sec: number;
+  esl_reconnects: number;
+  nats_connected: boolean;
+  gateways_total: number;
+  gateways_up: number;
+  gateways_down: number;
+  fs_active_calls: number;
+  fs_max_sessions: number;
+  fs_uptime: string;
+  route_total: number;
+  route_fallbacks: number;
+  uptime_sec: number;
+}
+
 export function connectWebSocket(onMessage: (data: any) => void): WebSocket {
   const token = getToken();
   const proto = window.location.protocol === 'https:' ? 'wss' : 'ws';

web/src/routes/+page.svelte

@@ -4,11 +4,12 @@
   import { onMount, onDestroy } from 'svelte';
   import {
     getNodes, connectWebSocket, isAuthenticated,
-    type NodeInfo
+    type NodeInfo, type BalancerInfo
   } from '$lib/api';
-  import { Activity, Phone, Zap, AlertTriangle, Wifi, Server } from 'lucide-svelte';
+  import { Activity, Phone, Zap, AlertTriangle, Wifi, Server, Plug, Globe, ArrowLeftRight, Network } from 'lucide-svelte';
 
   let nodes: NodeInfo[] = [];
+  let balancer: BalancerInfo | null = null;
   let ws: WebSocket | null = null;
   let error: string | null = null;
 
@@ -21,6 +22,8 @@
     ws = connectWebSocket((msg) => {
       if (msg.type === 'nodes_update') {
         nodes = msg.payload;
+      } else if (msg.type === 'balancer_update') {
+        balancer = msg.payload;
       }
     });
   });
@@ -67,10 +70,31 @@
     }
   }
 
+  function dotColor(ok: boolean, degrade?: boolean): string {
+    if (ok) return 'bg-green-500';
+    if (degrade) return 'bg-yellow-500';
+    return 'bg-red-500';
+  }
+
+  function fmtUptime(sec: number): string {
+    if (sec < 60) return `${sec}с`;
+    if (sec < 3600) return `${Math.floor(sec / 60)}м`;
+    if (sec < 86400) return `${Math.floor(sec / 3600)}ч`;
+    return `${Math.floor(sec / 86400)}д`;
+  }
+
+  function fmtNum(n: number): string {
+    if (n >= 1000) return (n / 1000).toFixed(1) + 'K';
+    return String(n);
+  }
+
   $: healthyCount = nodes.filter(n => n.score >= 0 && !n.disabled && !n.is_stale).length;
   $: totalCalls = nodes.reduce((s, n) => s + n.active_calls, 0);
   $: avgScore = nodes.length > 0 ? nodes.reduce((s, n) => s + n.score, 0) / nodes.length : 0;
   $: unhealthyList = nodes.filter(n => n.score < 0 || n.disabled || n.is_stale);
+  $: fallbackPct = balancer && balancer.route_total > 0
+    ? (balancer.route_fallbacks / balancer.route_total * 100).toFixed(1)
+    : '0';
 </script>
 
 {#if error}
@@ -79,6 +103,51 @@
   </div>
 {/if}
 
+<!-- Balancer Status Bar -->
+{#if balancer}
+  <div class="flex flex-wrap items-center gap-1 text-xs text-muted-foreground mb-4 px-3 py-2 border rounded-md bg-muted/30">
+    <span class="flex items-center gap-1 mr-2">
+      <span class="w-1.5 h-1.5 rounded-full {dotColor(balancer.esl_connected)}"></span>
+      <Plug class="h-3 w-3" />
+      ESL {balancer.esl_connected ? 'Online' : 'Offline'}
+      {#if balancer.esl_uptime_sec > 0}{fmtUptime(balancer.esl_uptime_sec)}{/if}
+    </span>
+    <span class="opacity-30">|</span>
+    <span class="flex items-center gap-1 mr-2">
+      <span class="w-1.5 h-1.5 rounded-full {dotColor(balancer.nats_connected)}"></span>
+      <Network class="h-3 w-3" />
+      NATS {balancer.nats_connected ? 'Online' : 'Offline'}
+    </span>
+    <span class="opacity-30">|</span>
+    <span class="flex items-center gap-1 mr-2">
+      <span class="w-1.5 h-1.5 rounded-full {balancer.gateways_down > 0 ? 'bg-red-500' : 'bg-green-500'}"></span>
+      <Globe class="h-3 w-3" />
+      GW {balancer.gateways_up}/{balancer.gateways_total}
+      {#if balancer.gateways_down > 0}
+        <span class="text-red-500">({balancer.gateways_down} down)</span>
+      {/if}
+    </span>
+    <span class="opacity-30">|</span>
+    <span class="flex items-center gap-1">
+      <ArrowLeftRight class="h-3 w-3" />
+      R {fmtNum(balancer.route_total)}
+      {#if balancer.route_fallbacks > 0}
+        <span class="text-orange-500">({fallbackPct}% fb)</span>
+      {/if}
+    </span>
+    {#if balancer.esl_connected && balancer.fs_max_sessions > 0}
+      <span class="opacity-30">|</span>
+      <span class="flex items-center gap-1">
+        <Phone class="h-3 w-3" />
+        FS {balancer.fs_active_calls}·{balancer.fs_max_sessions}
+        {#if balancer.fs_uptime}
+          <span class="opacity-50">{balancer.fs_uptime}</span>
+        {/if}
+      </span>
+    {/if}
+  </div>
+{/if}
+
 <!-- Summary Cards -->
 <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4 mb-6">
   <div class="border rounded-lg p-4 bg-card">