fix: 修复 server.WithDispatcherBufferSize 过小的情况下，在消息中发布新消息导致永久阻塞的问题

server/dispatcher.go

@@ -1,65 +1,106 @@
 package server
 
 import (
+	"context"
 	"github.com/alphadose/haxmap"
+	"sync"
 )
 
 var dispatcherUnique = struct{}{}
 
 // generateDispatcher 生成消息分发器
 func generateDispatcher(size int, name string, handler func(dispatcher *dispatcher, message *Message)) *dispatcher {
-	return &dispatcher{
-		name:    name,
-		buffer:  make(chan *Message, size),
-		handler: handler,
-		uniques: haxmap.New[string, struct{}](),
+	d := &dispatcher{
+		name:       name,
+		buffer:     make(chan *Message, size),
+		handler:    handler,
+		uniques:    haxmap.New[string, struct{}](),
+		queueMutex: new(sync.Mutex),
 	}
+	d.ctx, d.cancel = context.WithCancel(context.Background())
+	d.queueCond = sync.NewCond(d.queueMutex)
+	return d
 }
 
 // dispatcher 消息分发器
 type dispatcher struct {
-	name    string
-	buffer  chan *Message
-	uniques *haxmap.Map[string, struct{}]
-	handler func(dispatcher *dispatcher, message *Message)
+	name       string
+	buffer     chan *Message
+	uniques    *haxmap.Map[string, struct{}]
+	handler    func(dispatcher *dispatcher, message *Message)
+	ctx        context.Context
+	cancel     context.CancelFunc
+	queue      []*Message
+	queueMutex *sync.Mutex
+	queueCond  *sync.Cond
 }
 
-func (slf *dispatcher) unique(name string) bool {
-	_, loaded := slf.uniques.GetOrSet(name, dispatcherUnique)
+func (d *dispatcher) unique(name string) bool {
+	_, loaded := d.uniques.GetOrSet(name, dispatcherUnique)
 	return loaded
 }
 
-func (slf *dispatcher) antiUnique(name string) {
-	slf.uniques.Del(name)
+func (d *dispatcher) antiUnique(name string) {
+	d.uniques.Del(name)
 }
 
-func (slf *dispatcher) start() {
+func (d *dispatcher) start() {
+	d.process()
 	for {
 		select {
-		case message, ok := <-slf.buffer:
+		case message, ok := <-d.buffer:
 			if !ok {
 				return
 			}
-			slf.handler(slf, message)
+			d.handler(d, message)
 		}
 	}
 }
 
-func (slf *dispatcher) put(message *Message) {
-	slf.buffer <- message
+func (d *dispatcher) process() {
+	go func(ctx context.Context) {
+		for {
+			select {
+			case <-ctx.Done():
+				return
+			default:
+				d.queueMutex.Lock()
+				if len(d.queue) == 0 {
+					d.queueCond.Wait()
+				}
+				messages := make([]*Message, len(d.queue))
+				copy(messages, d.queue)
+				d.queue = d.queue[:0]
+				d.queueMutex.Unlock()
+				for _, message := range messages {
+					select {
+					case d.buffer <- message:
+					}
+				}
+			}
+		}
+	}(d.ctx)
 }
 
-func (slf *dispatcher) close() {
-	close(slf.buffer)
+func (d *dispatcher) put(message *Message) {
+	d.queueMutex.Lock()
+	d.queue = append(d.queue, message)
+	d.queueCond.Signal()
+	defer d.queueMutex.Unlock()
 }
 
-func (slf *dispatcher) transfer(target *dispatcher) {
+func (d *dispatcher) close() {
+	close(d.buffer)
+	d.cancel()
+}
+
+func (d *dispatcher) transfer(target *dispatcher) {
 	if target == nil {
 		return
 	}
 	for {
 		select {
-		case message, ok := <-slf.buffer:
+		case message, ok := <-d.buffer:
 			if !ok {
 				return
 			}