feat: 实现 WebSocket、mochi broker 与下行发布

internal/broker/queue.go

@@ -0,0 +1,45 @@
+package broker
+
+import (
+	"context"
+	"sync"
+
+	"git.asio.asia/nixevol/NixMsg/internal/app/port"
+)
+
+type uplinkItem struct {
+	conn    port.ConnInfo
+	payload []byte
+}
+
+// uplinkQueue 每端串行队列，长度 256，满了堵住 OnPublish（背压）。
+type uplinkQueue struct {
+	b          *Broker
+	endpointID string
+	ch         chan uplinkItem
+	once       sync.Once
+}
+
+func newUplinkQueue(b *Broker, endpointID string) *uplinkQueue {
+	q := &uplinkQueue{
+		b:          b,
+		endpointID: endpointID,
+		ch:         make(chan uplinkItem, uplinkQueueSize),
+	}
+	go q.loop()
+	return q
+}
+
+func (q *uplinkQueue) push(item uplinkItem) {
+	q.ch <- item // 满则阻塞读循环，形成背压
+}
+
+func (q *uplinkQueue) close() {
+	q.once.Do(func() { close(q.ch) })
+}
+
+func (q *uplinkQueue) loop() {
+	for item := range q.ch {
+		_ = q.b.uplink.HandleUplink(context.Background(), item.conn, item.payload)
+	}
+}