修改：代码包结构

internal/zsub/zgroup.go

@@ -0,0 +1,58 @@
+package zsub
+
+import (
+	"log"
+	"sync"
+	"sync/atomic"
+)
+
+type ZGroup struct { // ZGroup
+	sync.Mutex
+	conns  []*ZConn
+	offset int32
+	chMsg  chan string // 组消息即时投递
+	ztopic *ZTopic     // 所属topic
+}
+
+func (g *ZGroup) appendTo(c *ZConn) {
+	c.Lock()
+	defer c.Unlock()
+	topic := g.ztopic.topic
+
+	// report subscribe topic check
+	if c.substoped[topic] != nil {
+		return
+	}
+
+	// create new goroutine consumer message
+	unsubChan := make(chan int, 0)
+	c.substoped[topic] = unsubChan
+	g.conns = c.appendTo(g.conns)
+	go func() {
+		for {
+			select {
+			case msg, ok := <-g.chMsg:
+				if !ok {
+					return
+				}
+
+				err := c.send("message", topic, msg)
+				if err != nil { // 失败处理
+					log.Println("topic send err:", err)
+					g.chMsg <- msg
+					return
+				}
+
+				//log.Printf("[ %d ] topic send: %s %s\n", c.sn, topic, msg)
+				atomic.AddInt32(&g.offset, 1)
+			case <-c.stoped:
+				return
+			case <-unsubChan:
+				c.Lock()
+				defer c.Unlock()
+				delete(c.substoped, topic)
+				return
+			}
+		}
+	}()
+}