feat: 领导者服务改为同步锁

internal/app/app.go

@@ -77,13 +77,21 @@ func NewApp(params AppParams) *App {
 
 // Start runs the application, it is a non-blocking call.
 func (a *App) Start() error {
-	// Initialize system settings
+	// Perform leader election first. This is a blocking call.
+	if err := a.leaderService.ElectLeader(); err != nil {
+		return fmt.Errorf("leader election failed: %w", err)
+	}
+
+	if a.leaderService.IsLeader() {
 		if err := a.settingsManager.InitializeSystemSettings(); err != nil {
 			return fmt.Errorf("failed to initialize system settings: %w", err)
 		}
-	logrus.Info("System settings initialized")
+		logrus.Info("System settings initialized by leader.")
+	} else {
+		logrus.Info("This node is not the leader. Skipping leader-only initialization tasks.")
+	}
 
-	logrus.Info("Loading API keys into the key pool...")
+	logrus.Debug("Loading API keys into the key pool...")
 	if err := a.keyPoolProvider.LoadKeysFromDB(); err != nil {
 		return fmt.Errorf("failed to load keys into key pool: %w", err)
 	}
@@ -93,7 +101,6 @@ func (a *App) Start() error {
 	// Start background services
 	a.startRequestLogger()
 	a.logCleanupService.Start()
-	a.leaderService.Start()
 	a.keyValidationPool.Start()
 	a.keyCronService.Start()
 
@@ -105,7 +112,7 @@ func (a *App) Start() error {
 		ReadTimeout:    time.Duration(serverConfig.ReadTimeout) * time.Second,
 		WriteTimeout:   time.Duration(serverConfig.WriteTimeout) * time.Second,
 		IdleTimeout:    time.Duration(serverConfig.IdleTimeout) * time.Second,
-		MaxHeaderBytes: 1 << 20, // 1MB header limit
+		MaxHeaderBytes: 1 << 20,
 	}
 
 	// Start HTTP server in a new goroutine

internal/config/system_settings.go

@@ -197,7 +197,7 @@ func (sm *SystemSettingsManager) LoadFromDatabase() error {
 	sm.settings = DefaultSystemSettings()
 	sm.mapToStruct(settingsMap, &sm.settings)
 
-	logrus.Info("System settings loaded from database")
+	logrus.Debug("System settings loaded from database")
 	return nil
 }
 

internal/services/leader_service.go

@@ -3,6 +3,7 @@ package services
 import (
 	"crypto/rand"
 	"encoding/hex"
+	"fmt"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -16,10 +17,9 @@ const (
 	leaderLockKey         = "cluster:leader"
 	leaderLockTTL         = 30 * time.Second
 	leaderRenewalInterval = 10 * time.Second
+	electionTimeout       = 15 * time.Second
 )
 
-// Lua script for atomic lock renewal.
-// KEYS[1]: lock key, ARGV[1]: node ID, ARGV[2]: TTL in seconds.
 const renewLockScript = `
 if redis.call("get", KEYS[1]) == ARGV[1] then
     return redis.call("expire", KEYS[1], ARGV[2])
@@ -27,8 +27,6 @@ else
     return 0
 end`
 
-// Lua script for atomic lock release.
-// KEYS[1]: lock key, ARGV[1]: node ID.
 const releaseLockScript = `
 if redis.call("get", KEYS[1]) == ARGV[1] then
     return redis.call("del", KEYS[1])
@@ -44,106 +42,89 @@ type LeaderService struct {
 	stopChan     chan struct{}
 	wg           sync.WaitGroup
 	isSingleNode bool
-	firstElectionDone chan struct{}
-	firstElectionOnce sync.Once
 }
 
 // NewLeaderService creates a new LeaderService.
 func NewLeaderService(s store.Store) *LeaderService {
-	// Check if the store supports Lua scripting to determine if we are in a distributed environment.
 	_, isDistributed := s.(store.LuaScripter)
-
 	service := &LeaderService{
 		store:        s,
 		nodeID:       generateNodeID(),
 		stopChan:     make(chan struct{}),
 		isSingleNode: !isDistributed,
-		firstElectionDone: make(chan struct{}),
 	}
-
 	if service.isSingleNode {
-		logrus.Info("Store does not support Lua, running in single-node mode. Assuming leadership.")
+		logrus.Info("Running in single-node mode.")
 		service.isLeader.Store(true)
-		close(service.firstElectionDone)
 	} else {
-		logrus.Info("Store supports Lua, running in distributed mode.")
+		logrus.Info("Running in distributed mode.")
 	}
-
 	return service
 }
 
-// Start begins the leader election process.
-func (s *LeaderService) Start() {
+// ElectLeader attempts to become the cluster leader. This is a blocking call.
+func (s *LeaderService) ElectLeader() error {
 	if s.isSingleNode {
-		return
-	}
-	s.wg.Add(1)
-	go s.electionLoop()
+		logrus.Info("In single-node mode, leadership is assumed. Skipping election.")
+		return nil
 	}
 
-// Stop gracefully stops the leader election process.
+	logrus.WithField("nodeID", s.nodeID).Debug("Attempting to acquire leadership...")
+
+	acquired, err := s.acquireLock()
+	if err != nil {
+		return fmt.Errorf("failed to acquire leader lock: %w", err)
+	}
+
+	if acquired {
+		logrus.WithField("nodeID", s.nodeID).Info("Successfully acquired leadership. Starting renewal process.")
+		s.isLeader.Store(true)
+		s.wg.Add(1)
+		go s.renewalLoop()
+	} else {
+		logrus.WithField("nodeID", s.nodeID).Info("Another node is already the leader.")
+		s.isLeader.Store(false)
+	}
+
+	return nil
+}
+
+// Stop gracefully stops the leader renewal process if this node is the leader.
 func (s *LeaderService) Stop() {
-	if s.isSingleNode {
+	if s.isSingleNode || !s.isLeader.Load() {
 		return
 	}
+	logrus.Info("Stopping leader renewal process...")
 	close(s.stopChan)
 	s.wg.Wait()
+	s.releaseLock()
+	logrus.Info("Leader renewal process stopped.")
 }
 
 // IsLeader returns true if the current node is the leader.
-// In distributed mode, this call will block until the first election attempt is complete.
 func (s *LeaderService) IsLeader() bool {
-	<-s.firstElectionDone
 	return s.isLeader.Load()
 }
 
-func (s *LeaderService) electionLoop() {
+// renewalLoop is the background process that keeps the leader lock alive.
+func (s *LeaderService) renewalLoop() {
 	defer s.wg.Done()
-	logrus.WithField("nodeID", s.nodeID).Info("Starting leader election loop...")
-
-	// Attempt to acquire leadership immediately on start.
-	s.tryToBeLeader()
-
 	ticker := time.NewTicker(leaderRenewalInterval)
 	defer ticker.Stop()
 
 	for {
 		select {
 		case <-ticker.C:
-			s.tryToBeLeader()
-		case <-s.stopChan:
-			logrus.Info("Stopping leader election loop...")
-			if s.isLeader.Load() {
-				s.releaseLock()
-			}
-			return
-		}
-	}
-}
-
-func (s *LeaderService) tryToBeLeader() {
-	defer s.firstElectionOnce.Do(func() {
-		close(s.firstElectionDone)
-	})
-
-	if s.isLeader.Load() {
 			if err := s.renewLock(); err != nil {
 				logrus.WithError(err).Error("Failed to renew leader lock, relinquishing leadership.")
 				s.isLeader.Store(false)
-		}
 				return
 			}
-
-	acquired, err := s.acquireLock()
-	if err != nil {
-		logrus.WithError(err).Error("Error trying to acquire leader lock.")
-		s.isLeader.Store(false)
+			logrus.Debug("Successfully renewed leader lock.")
+		case <-s.stopChan:
+			logrus.Info("Leader renewal loop stopping.")
 			return
 		}
-
-	if acquired {
-		logrus.WithField("nodeID", s.nodeID).Info("Successfully acquired leader lock.")
-		s.isLeader.Store(true)
 	}
 }
 
@@ -152,22 +133,23 @@ func (s *LeaderService) acquireLock() (bool, error) {
 }
 
 func (s *LeaderService) renewLock() error {
-	luaStore := s.store.(store.LuaScripter) // Already checked in NewLeaderService
+	luaStore := s.store.(store.LuaScripter)
 	ttlSeconds := int(leaderLockTTL.Seconds())
-
 	res, err := luaStore.Eval(renewLockScript, []string{leaderLockKey}, s.nodeID, ttlSeconds)
 	if err != nil {
 		return err
 	}
-
 	if i, ok := res.(int64); !ok || i == 0 {
-		return store.ErrNotFound // Not our lock anymore
+		return fmt.Errorf("failed to renew lock, another node may have taken over")
 	}
 	return nil
 }
 
 func (s *LeaderService) releaseLock() {
-	luaStore := s.store.(store.LuaScripter) // Already checked in NewLeaderService
+	if !s.isLeader.Load() {
+		return
+	}
+	luaStore := s.store.(store.LuaScripter)
 	if _, err := luaStore.Eval(releaseLockScript, []string{leaderLockKey}, s.nodeID); err != nil {
 		logrus.WithError(err).Error("Failed to release leader lock on shutdown.")
 	} else {

internal/store/factory.go

@@ -10,19 +10,15 @@ import (
 )
 
 // NewStore creates a new store based on the application configuration.
-// It prioritizes Redis if a DSN is provided, otherwise it falls back to an in-memory store.
 func NewStore(cfg types.ConfigManager) (Store, error) {
 	redisDSN := cfg.GetRedisDSN()
-	// Prioritize Redis if configured
 	if redisDSN != "" {
-		logrus.Info("Redis DSN found, initializing Redis store...")
 		opts, err := redis.ParseURL(redisDSN)
 		if err != nil {
 			return nil, fmt.Errorf("failed to parse redis DSN: %w", err)
 		}
 
 		client := redis.NewClient(opts)
-		// Ping the server to ensure a connection is established.
 		if err := client.Ping(context.Background()).Err(); err != nil {
 			return nil, fmt.Errorf("failed to connect to redis: %w", err)
 		}
@@ -31,7 +27,6 @@ func NewStore(cfg types.ConfigManager) (Store, error) {
 		return NewRedisStore(client), nil
 	}
 
-	// Fallback to in-memory store
 	logrus.Info("Redis DSN not configured, falling back to in-memory store.")
 	return NewMemoryStore(), nil
 }