refactor: nodes analytics (#847)

* refactor: nodes analytics

* feat(debug): add pprof in debug mode

* refactor: websocket error handler

internal/analytic/node_record.go

@@ -2,81 +2,112 @@ package analytic
 
 import (
 	"context"
-	"encoding/json"
+	"net/http"
+	"sync"
+	"time"
+
 	"github.com/0xJacky/Nginx-UI/model"
 	"github.com/0xJacky/Nginx-UI/query"
 	"github.com/gorilla/websocket"
 	"github.com/uozi-tech/cosy/logger"
-	"net/http"
-	"time"
 )
 
-var stopNodeRecordChan = make(chan struct{})
+var (
+	ctx, cancel = context.WithCancel(context.Background())
+	wg          sync.WaitGroup
+	restartMu   sync.Mutex // Add mutex to prevent concurrent restarts
+)
 
 func RestartRetrieveNodesStatus() {
-	stopNodeRecordChan <- struct{}{}
-	time.Sleep(10 * time.Second)
-	go RetrieveNodesStatus()
+	restartMu.Lock() // Acquire lock before modifying shared resources
+	defer restartMu.Unlock()
+
+	// Cancel previous context to stop all operations
+	cancel()
+
+	// Wait for previous goroutines to finish
+	wg.Wait()
+
+	// Create new context for this run
+	ctx, cancel = context.WithCancel(context.Background())
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		RetrieveNodesStatus()
+	}()
 }
 
 func RetrieveNodesStatus() {
-	NodeMap = make(TNodeMap)
-	errChan := make(chan error)
+	logger.Info("RetrieveNodesStatus start")
+	defer logger.Info("RetrieveNodesStatus exited")
 
-	ctx, cancel := context.WithCancel(context.Background())
-
-	defer cancel()
+	mutex.Lock()
+	if NodeMap == nil {
+		NodeMap = make(TNodeMap)
+	}
+	mutex.Unlock()
 
 	env := query.Environment
-
 	envs, err := env.Where(env.Enabled.Is(true)).Find()
 	if err != nil {
 		logger.Error(err)
 		return
 	}
 
-	for _, v := range envs {
-		go nodeAnalyticLive(v, errChan, ctx)
-	}
+	var wg sync.WaitGroup
+	defer wg.Wait()
 
-	for {
-		select {
-		case err = <-errChan:
-			logger.Error(err)
-		case <-stopNodeRecordChan:
-			logger.Info("RetrieveNodesStatus exited normally")
-			return // will execute defer cancel()
-		}
-	}
-}
+	for _, env := range envs {
+		wg.Add(1)
+		go func(e *model.Environment) {
+			defer wg.Done()
+			retryTicker := time.NewTicker(5 * time.Second)
+			defer retryTicker.Stop()
 
-func nodeAnalyticLive(env *model.Environment, errChan chan error, ctx context.Context) {
-	for {
-		err := nodeAnalyticRecord(env, ctx)
-
-		if err != nil {
-			// set node offline
-			if NodeMap[env.ID] != nil {
-				mutex.Lock()
-				NodeMap[env.ID].Status = false
-				mutex.Unlock()
+			for {
+				select {
+				case <-ctx.Done():
+					return
+				default:
+					if err := nodeAnalyticRecord(e, ctx); err != nil {
+						logger.Error(err)
+						if NodeMap[env.ID] != nil {
+							mutex.Lock()
+							NodeMap[env.ID].Status = false
+							mutex.Unlock()
+						}
+						select {
+						case <-retryTicker.C:
+						case <-ctx.Done():
+							return
+						}
+					}
+				}
 			}
-			logger.Error(err)
-			errChan <- err
-			// wait 5s then reconnect
-			time.Sleep(5 * time.Second)
-		}
+		}(env)
 	}
+
+	<-ctx.Done()
 }
 
-func nodeAnalyticRecord(env *model.Environment, ctx context.Context) (err error) {
+func nodeAnalyticRecord(env *model.Environment, ctx context.Context) error {
+	scopeCtx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	node, err := InitNode(env)
+
 	mutex.Lock()
-	NodeMap[env.ID] = InitNode(env)
+	NodeMap[env.ID] = node
 	mutex.Unlock()
 
+	if err != nil {
+		return err
+	}
+
 	u, err := env.GetWebSocketURL("/api/analytic/intro")
 	if err != nil {
-		return
+		return err
 	}
 
 	header := http.Header{}
@@ -90,28 +121,20 @@ func nodeAnalyticRecord(env *model.Environment, ctx context.Context) (err error)
 
 	c, _, err := dial.Dial(u, header)
 	if err != nil {
-		return
+		return err
 	}
 
 	defer c.Close()
 
-	var nodeStat NodeStat
-
 	go func() {
-		// shutdown
-		<-ctx.Done()
+		<-scopeCtx.Done()
 		_ = c.Close()
 	}()
 
+	var nodeStat NodeStat
+
 	for {
-		_, message, err := c.ReadMessage()
-		if err != nil || websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseNoStatusReceived,
-			websocket.CloseNormalClosure) {
-			return err
-		}
-
-		err = json.Unmarshal(message, &nodeStat)
-
+		err = c.ReadJSON(&nodeStat)
 		if err != nil {
 			return err
 		}